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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Pharmacol.</journal-id>
<journal-title>Frontiers in Pharmacology</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Pharmacol.</abbrev-journal-title>
<issn pub-type="epub">1663-9812</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="publisher-id">1514676</article-id>
<article-id pub-id-type="doi">10.3389/fphar.2025.1514676</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Pharmacology</subject>
<subj-group>
<subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>
<italic>Berberis vulgaris</italic> fruit extract mitigated apoptosis in experimentally induced testicular ischemia and reperfusion injury in rats</article-title>
<alt-title alt-title-type="left-running-head">Yigit et al.</alt-title>
<alt-title alt-title-type="right-running-head">
<ext-link ext-link-type="uri" xlink:href="https://doi.org/10.3389/fphar.2025.1514676">10.3389/fphar.2025.1514676</ext-link>
</alt-title>
</title-group>
<contrib-group>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Yigit</surname>
<given-names>Serdar</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="corresp" rid="c001">&#x2a;</xref>
<xref ref-type="fn" rid="fn1">
<sup>&#x2020;</sup>
</xref>
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<contrib contrib-type="author">
<name>
<surname>Akgun</surname>
<given-names>Sakir</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="fn" rid="fn1">
<sup>&#x2020;</sup>
</xref>
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<contrib contrib-type="author">
<name>
<surname>Yesilyurt</surname>
<given-names>Isa</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="fn" rid="fn1">
<sup>&#x2020;</sup>
</xref>
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<contrib contrib-type="author">
<name>
<surname>Bitiktas</surname>
<given-names>Soner</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
<xref ref-type="fn" rid="fn1">
<sup>&#x2020;</sup>
</xref>
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<contrib contrib-type="author">
<name>
<surname>Taskin</surname>
<given-names>Ergin</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
<xref ref-type="fn" rid="fn1">
<sup>&#x2020;</sup>
</xref>
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<contrib contrib-type="author">
<name>
<surname>Alper Kahraman</surname>
<given-names>Ali</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
<xref ref-type="fn" rid="fn1">
<sup>&#x2020;</sup>
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<contrib contrib-type="author">
<name>
<surname>Yayla</surname>
<given-names>Muhammed</given-names>
</name>
<xref ref-type="aff" rid="aff6">
<sup>6</sup>
</xref>
<xref ref-type="fn" rid="fn1">
<sup>&#x2020;</sup>
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<contrib contrib-type="author">
<name>
<surname>Kilicle</surname>
<given-names>P&#x131;nar Aksu</given-names>
</name>
<xref ref-type="aff" rid="aff7">
<sup>7</sup>
</xref>
<xref ref-type="fn" rid="fn1">
<sup>&#x2020;</sup>
</xref>
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<contrib contrib-type="author">
<name>
<surname>Ali Bingol</surname>
<given-names>Seyit</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="fn" rid="fn1">
<sup>&#x2020;</sup>
</xref>
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<contrib contrib-type="author">
<name>
<surname>Ozdemir</surname>
<given-names>Bengul</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="fn" rid="fn1">
<sup>&#x2020;</sup>
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<contrib contrib-type="author">
<name>
<surname>Akdogan</surname>
<given-names>G&#xfc;l Esma</given-names>
</name>
<xref ref-type="aff" rid="aff7">
<sup>7</sup>
</xref>
<xref ref-type="fn" rid="fn1">
<sup>&#x2020;</sup>
</xref>
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<contrib contrib-type="author">
<name>
<surname>Karag&#xf6;z</surname>
<given-names>Mehmet Ali</given-names>
</name>
<xref ref-type="aff" rid="aff8">
<sup>8</sup>
</xref>
<xref ref-type="fn" rid="fn1">
<sup>&#x2020;</sup>
</xref>
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<aff id="aff1">
<sup>1</sup>
<institution>Histology and Embryology Department</institution>, <institution>Faculty of Medicine</institution>, <institution>Kafkas University</institution>, <addr-line>Kars</addr-line>, <country>T&#xfc;rkiye</country>
</aff>
<aff id="aff2">
<sup>2</sup>
<institution>Kafkas University Department of Medical Biology</institution>, <institution>Faculty of Medicine</institution>, <addr-line>Kars</addr-line>, <country>T&#xfc;rkiye</country>
</aff>
<aff id="aff3">
<sup>3</sup>
<institution>Phys&#x131;ology Department</institution>, <institution>Kafkas University</institution>, <institution>Faculty of Medicine</institution>, <addr-line>Kars</addr-line>, <country>T&#xfc;rkiye</country>
</aff>
<aff id="aff4">
<sup>4</sup>
<institution>Department of Biochemistry</institution>, <institution>Faculty of Medicine</institution>, <institution>A&#x11f;r&#x131; &#x130;brahim &#xc7;e&#xe7;en University</institution>, <addr-line>A&#x11f;r&#x131;</addr-line>, <country>T&#xfc;rkiye</country>
</aff>
<aff id="aff5">
<sup>5</sup>
<institution>Histology and Embryology Department</institution>, <institution>Kafkas University</institution>, <addr-line>Kars</addr-line>, <country>T&#xfc;rkiye</country>
</aff>
<aff id="aff6">
<sup>6</sup>
<institution>Pharmacology Department</institution>, <institution>Faculty of Medicine</institution>, <institution>Selcuk University</institution>, <addr-line>Konya</addr-line>, <country>T&#xfc;rkiye</country>
</aff>
<aff id="aff7">
<sup>7</sup>
<institution>Department of Biology</institution>, <institution>Faculty of Sciences and Arts</institution>, <addr-line>Kars</addr-line>, <country>T&#xfc;rkiye</country>
</aff>
<aff id="aff8">
<sup>8</sup>
<institution>Department of Urology</institution>, <institution>Kafkas University</institution>, <addr-line>Kars</addr-line>, <country>T&#xfc;rkiye</country>
</aff>
<author-notes>
<fn fn-type="edited-by">
<p>
<bold>Edited by:</bold> <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/715217/overview">Wei Peng</ext-link>, Chengdu University of Traditional Chinese Medicine, China</p>
</fn>
<fn fn-type="edited-by">
<p>
<bold>Reviewed by:</bold> <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/127265/overview">Milton Prabu</ext-link>, Annamalai University, India</p>
<p>
<ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/2280751/overview">Abdulahad Dogan</ext-link>, Van Y&#xfc;z&#xfc;nc&#xfc; Y&#x131;l University, T&#xfc;rkiye</p>
</fn>
<corresp id="c001">&#x2a;Correspondence: Serdar Yigit, <email>yigitserdar85@gmail.com</email>, <email>serdar.yigit@kafkas.edu.tr</email>
</corresp>
<fn fn-type="other" id="fn1">
<label>
<sup>&#x2020;</sup>
</label>
<p>ORCID: Serdar Yigit, <ext-link ext-link-type="uri" xlink:href="http://orcid.org/0000-0001-5631-2335">orcid.org/0000-0001-5631-2335</ext-link>; &#x15e;akir Akgun, <ext-link ext-link-type="uri" xlink:href="http://orcid.org/0000-0001-8247-970">orcid.org/0000-0001-8247-970</ext-link>; Isa Yesilyurt, <ext-link ext-link-type="uri" xlink:href="http://orcid.org/0000-0002-2164-4580">orcid.org/0000-0002-2164-4580</ext-link>; Soner Bitiktas, <ext-link ext-link-type="uri" xlink:href="http://orcid.org/0000-0002-6040-3771">orcid.org/0000-0002-6040-3771</ext-link>; Ergin Taskin, <ext-link ext-link-type="uri" xlink:href="http://orcid.org/0000-0002-1883-6055">orcid.org/0000-0002-1883-6055</ext-link>; Ali Alper Kahraman, <ext-link ext-link-type="uri" xlink:href="http://orcid.org/0000-0003-2924-2655">orcid.org/0000-0003-2924-2655</ext-link>; Muhammed Yayla, <ext-link ext-link-type="uri" xlink:href="http://orcid.org/0000-0002-0659-3084">orcid.org/0000-0002-0659-3084</ext-link>; P&#x131;nar Aksu Kilicle, <ext-link ext-link-type="uri" xlink:href="http://orcid.org/0000-0002-3567-5775">orcid.org/0000-0002-3567-5775</ext-link>; Seyit Ali Bingol, <ext-link ext-link-type="uri" xlink:href="http://orcid.org/0000-0001-6422-9582">orcid.org/0000-0001-6422-9582</ext-link>; Beng&#xfc;l &#xd6;zdemir, <ext-link ext-link-type="uri" xlink:href="http://orcid.org/0000-0003-2642-6096">orcid.org/0000-0003-2642-6096</ext-link>; G&#xfc;l Esma Akdogan, <ext-link ext-link-type="uri" xlink:href="http://orcid.org/0000-0001-7959-2130">orcid.org/0000-0001-7959-2130</ext-link>; Mehmet Ali Karag&#xf6;z, <ext-link ext-link-type="uri" xlink:href="http://orcid.org/0000-0002-0144-2041">orcid.org/0000-0002-0144-2041</ext-link>
</p>
</fn>
</author-notes>
<pub-date pub-type="epub">
<day>01</day>
<month>04</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="collection">
<year>2025</year>
</pub-date>
<volume>16</volume>
<elocation-id>1514676</elocation-id>
<history>
<date date-type="received">
<day>22</day>
<month>10</month>
<year>2024</year>
</date>
<date date-type="accepted">
<day>11</day>
<month>03</month>
<year>2025</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2025 Yigit, Akgun, Yesilyurt, Bitiktas, Taskin, Alper Kahraman, Yayla, Kilicle, Ali Bingol, Ozdemir, Akdogan and Karag&#xf6;z.</copyright-statement>
<copyright-year>2025</copyright-year>
<copyright-holder>Yigit, Akgun, Yesilyurt, Bitiktas, Taskin, Alper Kahraman, Yayla, Kilicle, Ali Bingol, Ozdemir, Akdogan and Karag&#xf6;z</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p>
</license>
</permissions>
<abstract>
<sec>
<title>Aim</title>
<p>The aim was to investigate the possible protective effect of <italic>Berberis vulgaris</italic> extract, which has anti-inflammatory and antioxidant properties, in the testes in an ischemia&#x2013;reperfusion (IR) injury model by utilizing molecular, biochemical, histopathological, and immunohistochemical methods.</p>
</sec>
<sec>
<title>Methods</title>
<p>A total of 56 male rats were divided in to 7 equal groups. Ischemia was induced by taking the testicles out of the scrotum and rotating them 720&#xb0; and after 3&#xa0;h reperfusion was induced. <italic>Berberis vulgaris</italic> extract was administered 3&#xa0;h before ischemia. The reperfusion groups were treated by oral gavage 1&#xa0;h before reperfusion. Following the 3-h reperfusion period, tissue and blood samples were collected.</p>
</sec>
<sec>
<title>Results</title>
<p>Histopathologically, H&#x026;E staining showed disruption in the seminiferous tubule structure in the ischemia and IR groups SOD levels decreased significantly in the IR group compared to the control group, whereas Berberis vulgaris did not change SOD levels following IR at 300 and 600&#xa0;mg/kg doses. At the dose of 600&#xa0;mg/kg, <italic>Berberis vulgaris</italic> significantly increased SOD levels compared to the ischemia group CAT activity was significantly higher in the BV300 and BV600 groups compared to the ischemia group. CAT activity was significantly lower in the IR group compared to the ischemia group (p &#x3c; 0.001). When compared to the control group, the ischemia group had a roughly 3-fold increase in caspase-3 expression. In the IR group, this ratio was dramatically increased&#x2014;roughly 5-fold. However, the antiapoptotic gene Bcl-2 expression was significantly decreased in both the ischemia and IR groups compared to the control group.</p>
</sec>
<sec>
<title>Conclusion</title>
<p>
<italic>B. vulgaris</italic> plant extract may have a protective effect against testes IR injury. Further molecular studies are needed to clarify this protective effect.</p>
</sec>
</abstract>
<kwd-group>
<kwd>
<italic>Berberis vulgaris</italic>
</kwd>
<kwd>caspase-3</kwd>
<kwd>bcl-2</kwd>
<kwd>ischemia and reperfusion</kwd>
<kwd>testes</kwd>
</kwd-group>
<contract-num rid="cn001">2021-TS-70</contract-num>
<contract-sponsor id="cn001">Kafkas &#xdc;niversitesi<named-content content-type="fundref-id">10.13039/501100009391</named-content>
</contract-sponsor>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Ethnopharmacology</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec id="s1">
<title>1 Introduction</title>
<p>Testicular torsion is a common medical emergency that can occur in men of all ages, but is especially common in early ages. Early surgery is the most common treatment for testicular torsion. Even if testicular detorsion is performed surgically, testicular damage is observed in 50% of men. Delays in diagnosis and treatment cause testicular loss (<xref ref-type="bibr" rid="B16">Li, 2022</xref>; <xref ref-type="bibr" rid="B32">Wei and Huang, 2022</xref>). The testicle can heal if detorsion is done within six hours of the commencement of symptoms (<xref ref-type="bibr" rid="B21">Sarac et al., 2019</xref>). Following the existing damage caused by ischemia in the testicle, restoration of blood flow after detorsion may cause an increase in tissue damage due to reperfusion. The term &#x201c;ischemia-reperfusion&#x201d; (IR) injury refers to this process (<xref ref-type="bibr" rid="B6">Cvetkovic et al., 2015</xref>). During the IR process, the amount of reactive oxygen species (ROS) increases excessively in the tissue. Reactive oxygen species such as superoxide anions, nitric oxide, hydrogen peroxide, hypochlorous acid, hydroxyl radicals, and singlet oxygen can damage cellular components such as lipids, proteins, deoxyribonucleic acid, and carbohydrates, causing disruption of cellular viability and even cellular death (<xref ref-type="bibr" rid="B33">Wei et al., 2022</xref>). Supportive treatment is used to prevent the negative effects of postsurgical intervention and IR damage. Some protocols used are aimed at reducing oxidative stress. For this purpose, improving antioxidant systems in organ damage caused by IR has effects on reducing IR damage. For this reason, the therapeutic effectiveness of many antioxidant agents has been demonstrated. In particular, plant-derived antioxidant substances are agents used against ROS due to their cost, accessibility, and fewer complications than drugs (<xref ref-type="bibr" rid="B2">Aldemir et al., 2012</xref>; <xref ref-type="bibr" rid="B22">Shokoohi et al., 2018</xref>). <italic>Berberis vulgaris</italic> is a medicinal plant species in the family Berberidaceae that contains many flavonoids (anthocyanins), phenolic compounds, alkaloids, and organic acids. The most prominent alkaloid in <italic>B. vulgaris</italic> is berberine. Berberine has been reported to have several effects including hypoglycemic, hypotensive, antioxidant, anti-inflammatory, and hypolipidemic. It inhibits the increased production of ROS, which is the leading cause of IR injury; reduces oxidative stress; and decreases the release of apoptosis-inducing factors and the proapoptotic factor cytochrome c in mitochondria that cause apoptosis. Berberine has also been shown in the literature to have antiapoptotic effects against ischemia (<xref ref-type="bibr" rid="B12">Imenshahidi and Hosseinzadeh, 2016</xref>; <xref ref-type="bibr" rid="B1">Abushouk et al., 2017</xref>; <xref ref-type="bibr" rid="B19">Rahimi-Madiseh et al., 2017</xref>). The aim of our study was to examine the protective effects of berberine against testicular IR injury, the changes in the antioxidants superoxide dismutase (SOD) and catalase (CAT) (which have defense functions against oxidative stress), and the location and expression of bcl-2 and caspase 3 to determine the possible effects of the apoptosis process.</p>
</sec>
<sec sec-type="materials|methods" id="s2">
<title>2 Materials and methods</title>
<sec id="s2-1">
<title>2.1 Animals</title>
<p>The study was approved by Kafkas University Animal Experiments Local Ethics Committee with decision number KA&#x00A8;U-HADYEK/2019-158. A total of 56 male adolescent (6-week-old) Sprague Dawley rats weighing 180&#xa0;g were used in this experimental study. The animals were housed in standard living conditions (temperature: 20&#xb0;C &#xb1; 2&#xb0;C; relative humidity: 50% &#xb1; 10%; light/dark cycle: 12&#xa0;h/12&#xa0;h).</p>
</sec>
<sec id="s2-2">
<title>2.2 Plant extraction</title>
<p>The <italic>B. vulgaris</italic> used in the study was collected from &#x15e;enkaya district of Erzurum in May 2021. It was brought to the laboratory and dried there, where there was dry airflow and no direct sunlight, in the dark. The body of the dried samples was ground in a grinder. Ethanol was used as the extraction solvent, and 650&#xa0;mL of it was put into a boiling flask. Ethanol was chosen as the extraction solvent because it is widely used and has strong solvent properties. The Soxhlet method was used because it is widely used and the extract yield is obtained most intensively. The solvent was extracted (10-15 siphons) for approximately 10&#xa0;h until it became clear. The liquid extracts obtained at the end of 10&#xa0;h were filtered through blue band filter paper for removal of all particles. The filtered extract sample was evaporated in a rotary evaporator at 35&#xb0;C-45&#xb0;C. The plant extract remaining in the balloon was kept in a desiccator for 12&#xa0;h. The extract, which was completely removed from its solvent, was weighed with an accuracy of 0.1&#xa0;mg, put into the extract box, and stored at &#x2b;4&#xb0;C for use in the study (<xref ref-type="bibr" rid="B31">Wang and Weller 2006</xref>; <xref ref-type="bibr" rid="B28">Uluman and Kilicle 2020</xref>).</p>
</sec>
<sec id="s2-3">
<title>2.3 Experiment design</title>
<p>The animals were randomly divided into 7 groups (<xref ref-type="table" rid="T1">Table 1</xref>).The rats were fasted for 12&#xa0;h before the surgical intervention. Following anesthesia with intraperitoneal 30&#xa0;mg/kg thiopental sodium, an incision was made in the scrotum of the rats. The testicles were taken out of the scrotum and rotated 720&#xb0; and ligated with a 4.0 silk suture to create ischemia. Then they were placed back inside the scrotum and it was closed. Reperfusion was induced after 3&#xa0;h of ischemia by removing the ligation and restoring rotation. <italic>Berberis vulgaris</italic> extract was administered 3&#xa0;h before the surgical intervention in the ischemia groups (groups 3 and 4). In the IR groups, it was administered by oral gavage 2&#xa0;h before the end of reperfusion (groups 5 and 6). After 3&#xa0;h of reperfusion, the experiment was terminated by euthanasia. Testicular tissue and blood samples were collected.</p>
<table-wrap id="T1" position="float">
<label>TABLE 1</label>
<caption>
<p>The descriptions of experimental groups.</p>
</caption>
<table>
<thead valign="top">
<tr>
<th align="left">Name</th>
<th align="center">Descriptions</th>
<th align="left">Abbreviations</th>
<th align="center">n</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="left">Group 1</td>
<td align="left">Control</td>
<td align="left">CNT</td>
<td align="center">8</td>
</tr>
<tr>
<td align="left">Group 2</td>
<td align="left">Ischemia: The testes were removed from the scrotum, rotated 720&#xb0;, and tied with a 4.0 silk suture to create ischemia</td>
<td align="left">I</td>
<td align="center">8</td>
</tr>
<tr>
<td align="left">Group 3</td>
<td align="left">Berberis vulgaris 300&#xa0;mg/kg &#x2b; Testicular Ischemia: <italic>Berberis vulgaris</italic> 300&#xa0;mg/kg plant extract was given 3&#xa0;h before ischemia was induced</td>
<td align="left">I &#x2b; BV300</td>
<td align="center">8</td>
</tr>
<tr>
<td align="left">Group 4</td>
<td align="left">
<italic>Berberis vulgaris</italic> 600&#xa0;mg/kg &#x2b; Testicular Ischemia: <italic>Berberis vulgaris</italic> 600&#xa0;mg/kg plant extract was given 3&#xa0;h before ischemia was induced</td>
<td align="left">I &#x2b; BV600</td>
<td align="center">8</td>
</tr>
<tr>
<td align="left">Group 5</td>
<td align="left">Testicular Ischemia &#x2b; Reperfusion: Ischemia was created for 3&#xa0;h. After ischemia, reperfusion was performed for 3&#xa0;h</td>
<td align="left">IR</td>
<td align="center">8</td>
</tr>
<tr>
<td align="left">Group 6</td>
<td align="left">Testicular Ischemia &#x2b; Reperfusion &#x2b; <italic>Berberis vulgaris</italic> 300&#xa0;mg/kg: Testicular ischemia was induced for 3&#xa0;h. After ischemia, testicular reperfusion was performed for 3&#xa0;h. <italic>Berberis vulgaris</italic> mg/kg 300 was given 2&#xa0;h before the end of perfusion</td>
<td align="left">IR &#x2b; BV300</td>
<td align="center">8</td>
</tr>
<tr>
<td align="left">Group 7</td>
<td align="left">Testicular Ischemia (3&#xa0;h) &#x2b; Reperfusion (1&#xa0;h) &#x2b; <italic>Berberis vulgaris</italic> 600&#xa0;mg/kg: Testicular ischemia was induced for 3&#xa0;h. After ischemia, testicular reperfusion was performed for 3&#xa0;h. <italic>Berberis vulgaris</italic> 600&#xa0;mg/kg was given 2&#xa0;h before the end of perfusion</td>
<td align="left">IR &#x2b; BV600</td>
<td align="center">8</td>
</tr>
</tbody>
</table>
</table-wrap>
</sec>
<sec id="s2-4">
<title>2.4 Histological and immunohistochemical examinations</title>
<p>The testicular tissue was fixed in 10% formalin for 48&#xa0;h (<xref ref-type="bibr" rid="B20">Sahin et al., 2021</xref>). Serial sections of 5&#xa0;&#xb5;m thickness were obtained from each tissue block with a Leica RM2125RTS microtome. Hematoxylin and eosin (H&#x26;E) and immunohistochemical (IHC) staining were performed for histologic examinations. Immunohistochemical Bcl-2 (AF6139 China) and caspase-3 (AF6311 China) protocols specified by the companies were applied. Calculations were performed and the average immunoreactivity intensity was reported. Using light microscopy, semiquantitative scoring was carried out. The immunoreactivity of samples from each animal was scored as follows: none (0), mild (1), moderate (2), severe (3), or very severe (4). Findings were photographed with an Olympus BX43 microscope using the software cellSens.</p>
</sec>
<sec id="s2-5">
<title>2.5 Biochemical examination</title>
<p>Cold 0.1 M phosphate buffer (pH 7.4) was added to the tissue samples at a ratio of 1/10. Tissue homogenates were centrifuged at 4000 &#xd7; <italic>g</italic> and &#x2b;4&#xb0;C for 20&#xa0;min. Supernatants were obtained. In the supernatants obtained, commercially available Rat SOD (SunLong, Biotech, CAT: SL1341Ra) ELISA Kit levels and Rat CAT (SunLong, Biotech, CAT: SL1084Ra) ELISA kit activity levels were measured.</p>
<sec id="s2-5-1">
<title>2.5.1 Procedure for CAT</title>
<p>well in the Microelisa stripplate empty. 10&#xa0;&#x3bc;L of </p>
<p>
<list list-type="simple">
<list-item>
<p>&#x2009;1. Dilution of Standards</p>
</list-item>
<list-item>
<p>2. As a blank control, leave a well in the Microelisa stripplate empty. 10&#xa0;&#x3bc;L of sample and 40&#xa0;&#x3bc;L of sample dilution buffer (dilution factor: 5) are added to sample wells. Samples ought to be placed such they do not come into contact with the well wall. Shake gently while mixing well.</p>
</list-item>
<list-item>
<p>3. The plate is incubated for 30&#xa0;min at 37&#xb0;C after the membrane has been closed. Dilution: Use distilled water to dilute the concentrated wash buffer (30 times for 96&#xa0;T).</p>
</list-item>
<list-item>
<p>4. Washing: Remove the membrane of the sealing plate, aspirate and add washing solution. Allow the washing solution to rest for 30&#xa0;seconds before discarding it. Five times, the washing process is carried out.</p>
</list-item>
<list-item>
<p>5. All wells, with the exception of the blank control well, receive 50&#xa0;&#x3bc;L of HRP-Conjugate reagent.</p>
</list-item>
<list-item>
<p>6. Incubation following Step 3&#x2019;s instructions.</p>
</list-item>
<list-item>
<p>7. Washing as detailed in Step 5.</p>
</list-item>
<list-item>
<p>8. Coloring: Fill each well with 50&#xa0;&#x3bc;L of each chromogen solution (A and B), gently shake to combine, and then incubate for 15&#xa0;min at 37&#xb0;C.</p>
</list-item>
<list-item>
<p>9. Termination: To stop the reaction, 50&#xa0;&#x3bc;L of the solution is put to each well. The well&#x2019;s hue ought should shift from blue to yellow.</p>
</list-item>
<list-item>
<p>10. The absorbance O.D. at 450&#xa0;nm can be measured with a Microtiter Plate Reader.</p>
</list-item>
</list>
</p>
<table-wrap id="udT1" position="float">
<table>
<tbody valign="top">
<tr>
<td align="left">36&#xa0;pg/mL</td>
<td align="left">Standard No.1</td>
<td align="left">300&#xa0;&#x3bc;L original standard &#x2b;150&#xa0;&#x3bc;L standard diluents</td>
</tr>
<tr>
<td align="left">24&#xa0;pg/mL</td>
<td align="left">Standard No.2</td>
<td align="left">300&#xa0;&#x3bc;L Standard No.1 &#x2b; 150&#xa0;&#x3bc;L Standard diluents</td>
</tr>
<tr>
<td align="left">12&#xa0;pg/mL</td>
<td align="left">Standard No.3</td>
<td align="left">150&#xa0;&#x3bc;L Standard No.2 &#x2b; 150&#xa0;&#x3bc;L Standard diluent</td>
</tr>
<tr>
<td align="left">6&#xa0;pg/mL</td>
<td align="left">Standard No.4</td>
<td align="left">150&#xa0;&#x3bc;L Standard No.3 &#x2b; 150&#xa0;&#x3bc;L Standard diluent</td>
</tr>
<tr>
<td align="left">3&#xa0;pg/mL</td>
<td align="left">Standard No.5</td>
<td align="left">150&#xa0;&#x3bc;L Standard No.4 &#x2b; 150&#xa0;&#x3bc;L Standard diluent</td>
</tr>
</tbody>
</table>
</table-wrap>
</sec>
</sec>
<sec id="s2-6">
<title>2.6 Sample collection and RNA isolation</title>
<p>The excised rat testicles were resected and stored at &#x2212;80&#xb0;C until RNA isolation. A total RNA kit (E2075, EcoTech Biotechnology) was used for total RNA isolation. Isolation was performed as described in the kit protocol. Samples were stored at &#x2212;80&#xb0;C until use.</p>
<sec id="s2-6-1">
<title>2.6.1 Real-time PCR (qRT-PCR)</title>
<p>The total RNAs obtained were translated into cDNA using Maxime&#x2122; RT PreMix (25,082, iNtRON Biotechnology). The reaction was performed as described in the kit protocol. After cDNA samples were diluted (1:2 ratio), the gene expression levels were detected using the Taqman system (AMPIGENE<sup>&#xae;</sup> qPCR Probe Mix Hi-ROX, ENZ-NUC-106, Enzo Life Science). ABI Step One Plus (Applied Biosystems) was used for the qRT-PCR reactions. The expression levels of caspase-3 (Rn00563902_m1) and Bcl-2 (Rn99999125_m1) genes (4,331,182 TaqMan, Applied Biosystems) were analyzed with the endogenous control gene Beta-Actin (Rn00667869_m1). The differences in gene expression between the groups were presented as fold change (2<sup>&#x2212;&#x394;&#x394;Ct</sup> method). Figures from the comparative analysis were plotted using GraphPad Prism&#x2122; software (GraphPad Software, San Diego, CA, United States).</p>
</sec>
</sec>
</sec>
<sec sec-type="results" id="s3">
<title>3 Results</title>
<sec id="s3-1">
<title>3.1 Histopathological findings</title>
<p>H&#x26;E staining showed disruption in the seminiferous tubule structure in the ischemia and IR groups (<xref ref-type="fig" rid="F1">Figure 1</xref>). Especially in the ischemia and IR groups, the germinal epithelium was disrupted and the cells forming the spermatogonial series could not be clearly distinguished. It was observed that the germinal epithelium was separated from itself and from the tubular basement membrane. It was observed that spermatogenic cell density decreased and spermatids and spermia decreased in some tubules.</p>
<fig id="F1" position="float">
<label>FIGURE 1</label>
<caption>
<p>Hematoxylin-Eosin (H&#x26;E) staining photomicrographs of all experimental groups. <bold>(A)</bold> CNT, <bold>(B)</bold> I, <bold>(C)</bold> I &#x2b; BV300, <bold>(D)</bold> I &#x2b; BV600, <bold>(E)</bold> IR, <bold>(F)</bold> IR &#x2b; BV300, <bold>(G)</bold> IR &#x2b; BV600. Arrow indicate seminiferous tubule damage.</p>
</caption>
<graphic xlink:href="fphar-16-1514676-g001.tif"/>
</fig>
<p>Bcl-2 immunoreactivity level was significantly decreased in the ischemia group compared to the control group. <italic>Berberis vulgaris</italic> had no effect at a 300&#xa0;mg/kg dose, while a 600&#xa0;mg/kg dose significantly increased immunoreactivity levels compared to the ischemia group (<xref ref-type="fig" rid="F2">Figure 2</xref>). Bcl-2 immunoreactivity levels were significantly decreased in reperfused animals compared to the control group. BV 300&#xa0;mg/kg and 600&#xa0;mg/kg doses increased Bcl-2 immunoreactivity levels and reached control group levels.</p>
<fig id="F2" position="float">
<label>FIGURE 2</label>
<caption>
<p>BCL -2 staining photomicrographs of all experimental groups. <bold>(A)</bold> CNT, <bold>(B)</bold> I, <bold>(C)</bold> I &#x2b; BV300, <bold>(D)</bold> I &#x2b; BV600, <bold>(E)</bold> IR, <bold>(F)</bold> IR &#x2b; BV300, <bold>(G)</bold> IR &#x2b; BV600, <bold>(H)</bold> BCL -2 Immunoreactivity. Results are given as mean &#xb1; SD. Kruskal&#x2013;Wallis test and Dunn&#x2019;s <italic>post hoc</italic> test were used to analyze data comparing the groups. &#x2a;&#x2a;&#x2a;<italic>p</italic> &#x3c; 0.001.</p>
</caption>
<graphic xlink:href="fphar-16-1514676-g002.tif"/>
</fig>
<p>Caspase-3 was substantially higher in the ischemia group compared to the sham group (p &#x3c; 0.001). BV600&#xa0;mg/kg dose significantly decreased caspase-3 levels compared to the ischemia group (p &#x3d; 0.015). While caspase-3 levels were slightly higher in the IR group than in the ischemia group, the difference was not statistically significant. <italic>Berberis vulgaris</italic> 600&#xa0;mg/kg dose significantly decreased caspase-3 levels compared to the IR group (p &#x3c; 0.001) (<xref ref-type="fig" rid="F3">Figure 3</xref>).</p>
<fig id="F3" position="float">
<label>FIGURE 3</label>
<caption>
<p>Caspase-3 staining photomicrographs of all experimental groups. <bold>(A)</bold> CNT, <bold>(B)</bold> I, <bold>(C)</bold> I &#x2b; BV300, <bold>(D)</bold> I &#x2b; BV600, <bold>(E)</bold> IR, <bold>(F)</bold> IR &#x2b; BV300, <bold>(G)</bold> IR &#x2b; BV600, <bold>(H)</bold> Caspase-3 Immunoreactivity. Results are given as mean &#xb1; SD. Kruskal&#x2013;Wallis test and Dunn&#x2019;s <italic>post hoc</italic> test were used to analyze data comparing the groups. &#x2a;<italic>p</italic> &#x3c; 0.05, &#x2a;&#x2a;&#x2a;<italic>p</italic> &#x3c; 0.001.</p>
</caption>
<graphic xlink:href="fphar-16-1514676-g003.tif"/>
</fig>
</sec>
<sec id="s3-2">
<title>3.2 Biochemical findings</title>
<p>Although SOD levels were decreased in the ischemia group compared to the control group, the difference was not statistically significant (p &#x3d; 0.70). At the dose of 600&#xa0;mg/kg, <italic>B. vulgaris</italic> significantly increased SOD levels compared to the ischemia group (p &#x3d; 0.027), while it had no effect at the dose of 300&#xa0;mg/kg (p &#x3e; 0.99). SOD levels decreased significantly in the IR group compared to the control group (p &#x3d; 0.02), whereas <italic>B. vulgaris</italic> did not change SOD levels following IR at 300 and 600&#xa0;mg/kg doses (p &#x3e; 0.99, p &#x3d; 0.942) (<xref ref-type="fig" rid="F4">Figure 4</xref>).</p>
<fig id="F4" position="float">
<label>FIGURE 4</label>
<caption>
<p>The effect of Berberis vulgaris on SOD <bold>(A)</bold> and CAT <bold>(B)</bold> levels in groups. Results are given as mean &#xb1; SD. <bold>(A)</bold> One-way ANOVA and Tukey <italic>post hoc</italic> test were used to analyze data comparing the groups. <bold>(B)</bold> Kruskal&#x2013;Wallis test and Dunn&#x2019;s <italic>post hoc</italic> test were used to analyze data comparing the groups. &#x2a;<italic>p</italic> &#x3c; 0.05, &#x2a;&#x2a;&#x2a;<italic>p</italic> &#x3c; 0.001.</p>
</caption>
<graphic xlink:href="fphar-16-1514676-g004.tif"/>
</fig>
<p>CAT activity was significantly lower in the ischemia group compared to the control group (p &#x3c; 0.001). CAT activity was significantly higher in the BV300 and BV600 groups compared to the ischemia group (p &#x3e; 0.99, p &#x3d; 0.9997). CAT activity was significantly lower in the IR group than in the ischemia group (p &#x3c; 0.001). At 300 and 600&#xa0;mg/kg doses, <italic>B. vulgaris</italic> significantly increased CAT activity compared to the IR group dose dependently (p &#x3c; 0.001) (<xref ref-type="fig" rid="F4">Figure 4</xref>).</p>
</sec>
<sec id="s3-3">
<title>3.3 RT-PCR results</title>
<p>Caspase-3 expression was upregulated about 3-fold in the ischemia group compared to the control group. This ratio increased dramatically by about 5-fold in the IR group. However, the antiapoptotic gene Bcl-2 expression was significantly decreased in both the ischemia and IR groups compared to the control group. In both the ischemia and IR groups, 300&#xa0;mg and 600&#xa0;mg of <italic>B. vulgaris</italic> extract significantly downregulated caspase-3 expression levels (<xref ref-type="fig" rid="F5">Figure 5</xref>). The 600&#xa0;mg application <italic>B. vulgaris</italic> extract was more effective on caspase-3 expression. qPCR analysis revealed a decrease in caspase-3 expression, while Bcl-2 expression increased.</p>
<fig id="F5" position="float">
<label>FIGURE 5</label>
<caption>
<p>Relative expression levels of caspase-3 <bold>(A)</bold> and Bcl-2 <bold>(B)</bold> mRNAs. Results are given as mean &#xb1; SD. Student&#x2019;s t<italic>-</italic>test was used to analyze data comparing two groups. &#x2a;<italic>p</italic> &#x3c; 0.05, &#x2a;&#x2a;<italic>p</italic> &#x3c; 0.01.</p>
</caption>
<graphic xlink:href="fphar-16-1514676-g005.tif"/>
</fig>
</sec>
</sec>
<sec sec-type="discussion" id="s4">
<title>4 Discussion</title>
<p>Testicular torsion affects the blood vessels that supply the testicles, reducing blood flow and causing acute ischemic injury. After the detorsion performed to eliminate these consequences, the rapid blood flow caused by reperfusion exposes the testicular tissue to intense oxygen, causing the production of large amounts of free oxygen radicals, which further aggravates tissue damage (<xref ref-type="bibr" rid="B36">Somuncu et al., 2006</xref>). Antioxidant treatment before ischemia and after reperfusion is critical to protect testicular tissue from these negative effects and prevent male infertility. Natural antioxidants may be potential protective agents against IR damage. It has been reported that the alkaloid berberine in <italic>B. vulgaris</italic> extract inhibits ROS formation, reduces oxidative stress, and reduces the release of apoptosis-inducing factors. In <italic>B. vulgaris</italic> extract studies, dose of 300&#xa0;mg/kg and 600&#xa0;mg/kg was generally used (<xref ref-type="bibr" rid="B26">Taheri et al., 2012</xref>; <xref ref-type="bibr" rid="B17">Majeed et al., 2015</xref>). With reference to these studies, we adjusted the dose we would give to the animals. It was also reported that berberine has antiapoptotic effects against ischemia by reducing caspase-3 and increasing the Bcl-2/BAX ratio. Berberine has been widely investigated in studies on IR injury because of its antioxidant features. However, there are a very limited number of studies to determine its protective effect against testicular IR injury. In the present study, the aim was to examine the protective effects of <italic>B. vulgaris</italic> against ischemia injury caused by testicular torsion reperfusion injury after detorsion.</p>
<p>Limited number of studies in the literature have reported that berberine has a protective effect by reducing the increased oxidant levels and histological damage caused by testicular IR injury (<xref ref-type="bibr" rid="B10">Gholampour, Malekpour Mansourkhani et al., 2019</xref>; <xref ref-type="bibr" rid="B14">Kazaz et al., 2020</xref>). In our study, histopathological examinations showed that, in accordance with the literature, the deterioration in the seminiferous tubule structure due to ischemia and IR injury decreased with increasing the dose of <italic>B. vulgaris</italic> extract.</p>
<p>Enzymes like CAT catalyze the synthesis of oxygen and water from hydrogen peroxide, while SOD, the antioxidant system&#x2019;s first line of defense, catalyzes the formation of oxygen and hydrogen peroxide from a superoxide anion (<xref ref-type="bibr" rid="B11">Hermes-Lima, 2004</xref>). In a study investigating the effect of berberine against the damage caused by <italic>Schistosoma mansoni</italic>-induced oxidative stress on testicular tissue, it was reported that berberine showed a protective effect on testicular tissue by decreasing the MDA level and increasing the level of antioxidant enzymes such as SOD and CAT (<xref ref-type="bibr" rid="B8">Dkhil et al., 2014</xref>). In addition to this limited number of studies examining the relationship between testicular IR damage and berberine, numerous studies examining the effect of antioxidant systems against IR damage in other tissues such as the heart, liver, kidney and brain reported that it increased the activity of SOD and CAT enzymes (<xref ref-type="bibr" rid="B29">Visnagri et al., 2015</xref>; <xref ref-type="bibr" rid="B5">Chu et al., 2017</xref>; <xref ref-type="bibr" rid="B13">Jia et al., 2022</xref>). In our study, biochemical analysis showed that <italic>B. vulgaris</italic> extract administration significantly increased SOD levels compared to the ischemia group. However, in our study, the administration of <italic>B. vulgaris</italic> extract to rats with IR damage did not change SOD enzyme activity. This may have been due to the increase in the amount of H<sub>2</sub>O<sub>2</sub> produced by mitochondria due to increased ATP production during adaptation to the stress caused by IR damage. A similar result regarding adaptation to environmental stress was shown by <xref ref-type="bibr" rid="B25">Suzuki et al. (2018)</xref>. It may also have been caused by the depletion in the antioxidant capacity of SOD due to the depletion in internal energy reserves to cope with stress (<xref ref-type="bibr" rid="B15">Letendre et al., 2012</xref>; <xref ref-type="bibr" rid="B23">Sokolova, 2013</xref>). A more detailed study is needed to explain this difference. CAT activity, which was decreased considerably after ischemia and IR, were also increased by <italic>B. vulgaris</italic> extract and reached that of the control group, which is consistent with the above-mentioned studies.</p>
<p>Oxidative stress is an important cell death promoter in response to various signals and pathophysiological conditions. ROS accumulation destabilizes the mitochondrial outer membrane and releases proapoptotic factors into the cytosol, inducing caspase activity and cell death (<xref ref-type="bibr" rid="B24">Suen et al., 2008</xref>). Cytochrome c binds to apoptotic protease activating factor 1 (Apaf1), facilitating apoptosome formation. Finally, the apoptosome stimulates dimerization of the initiator caspase-9, which cleaves and activates procaspases-3, -6, and -7 (<xref ref-type="bibr" rid="B27">Tait and Green, 2010</xref>; <xref ref-type="bibr" rid="B18">McArthur and Kile, 2018</xref>). Activated caspase-3 can degrade intracellular structural and functional proteins, resulting in cell death (<xref ref-type="bibr" rid="B34">Yuan et al., 1993</xref>). Therefore, Bcl-2 functions as an inhibitor of apoptosis, while caspase-3 is considered an indicator of apoptosis. Although the literature on the antiapoptotic effect of berberine on testicular tissue is very limited, its effects on many other tissues like kidney, heart and brain have been studied in detail. These studies have shown that berberine can inhibit apoptosis by decreasing caspase-3 and BAX expression and increasing Bcl-2 expressi (<xref ref-type="bibr" rid="B30">Wang et al., 2018</xref>; <xref ref-type="bibr" rid="B9">Gendy et al., 2023</xref>; <xref ref-type="bibr" rid="B4">Binmahfouz et al., 2024</xref>). In our study, immunohistochemical analyses showed that Bcl-2 positivity decreased in spermatogenic cells in the ischemia and IR groups in testicular tissue and increased due to the <italic>B. vulgaris</italic> extract dose increase. The Bcl-2 immunoreactivity level was significantly higher and caspase-3 immunoreactivity level was significantly lower in the <italic>B. vulgaris</italic> extract-treated groups compared to the ischemia and IR groups. At the same time, the qPCR analysis demonstrated that Bcl-2 expression was significantly decreased in both the ischemia and IR groups compared to the control group, whereas caspase-3 expression was increased. These effects of ischemia and IR were reversed due to the <italic>B. vulgaris</italic> extract dose increase. The results obtained from the above-mentioned studies are parallel to our results obtained from immunohistochemistry and qPCR results that <italic>B. vulgaris</italic> extract exhibits antiapoptotic effects by reducing caspase-3 levels and increasing Bcl-2 levels.</p>
<p>Our study has limitations. While it provides some valuable information on the protective effect of <italic>B. vulgaris</italic> extract against testicular IR injury, these results are preliminary because <italic>B. vulgaris</italic> plant extract contains chemicals other than berberine. Therefore, more comprehensive studies are needed to reveal the potential of natural compounds to contribute to medical applications. Our results indicating that testicular damage is reduced by <italic>B. vulgaris</italic> extract should be supported by clinical trials.</p>
<p>Considering the results of our study together, it was determined that <italic>B. vulgaris</italic> extract showed a protective effect against testicular IR injury by activating antioxidant and antiapoptotic mechanisms. Since mammalian testes require large amounts of oxygen for continuous active cell division and spermatogenesis, they are susceptible to oxidative stress and oxygen depletion (<xref ref-type="bibr" rid="B7">Davoodi et al., 2020</xref>; <xref ref-type="bibr" rid="B3">Balci et al., 2021</xref>).</p>
</sec>
<sec sec-type="conclusion" id="s5">
<title>5 Conclusion</title>
<p>Immediate surgical treatment of testicular torsion, as well as elimination of testicular IR damage, is critical for preventing male infertility. The improvement of the defect in the seminiferous tubule structure shown by H&#x26;E staining, increase in Bcl-2 positivity and decrease in caspase-3 positivity shown by the immunohistochemical evaluation, increase in Bcl-2 expression and decrease in caspase-3 expression in the PCR results, and increase in SOD and CAT enzyme activity shown by the biochemical analysis indicated that the damage and imbalances resulting from ischemia and IR damage were corrected by the administration of <italic>B. vulgaris</italic> extract. The protective effects of <italic>B. vulgaris</italic> extract are promising in this respect.</p>
</sec>
</body>
<back>
<sec sec-type="data-availability" id="s6">
<title>Data availability statement</title>
<p>The original contributions presented in the study are included in the article/supplementary material, further inquiries can be directed to the corresponding author.</p>
</sec>
<sec sec-type="ethics-statement" id="s7">
<title>Ethics statement</title>
<p>The animal study was approved by Kafkas University with the decision number 2019-158. The study was conducted in accordance with the local legislation and institutional requirements.</p>
</sec>
<sec sec-type="author-contributions" id="s8">
<title>Author contributions</title>
<p>SY: Conceptualization, Data curation, Formal Analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing&#x2013;original draft. SA: Methodology, Writing&#x2013;original draft. IY: Investigation, Writing&#x2013;original draft. SB: Investigation, Writing&#x2013;original draft. ET: Methodology, Writing&#x2013;original draft. AA: Investigation, Writing&#x2013;original draft. MY: Data curation, Formal Analysis, Supervision, Writing&#x2013;original draft. PK: Writing&#x2013;original draft, Methodology. SA: Investigation, Writing&#x2013;original draft. BO: Investigation, Writing&#x2013;original draft. GA: Writing&#x2013;original draft, Investigation. MK: Methodology, Writing&#x2013;original draft.</p>
</sec>
<sec sec-type="funding-information" id="s9">
<title>Funding</title>
<p>The author(s) declare that financial support was received for the research and/or publication of this article. This article was financed by the Scientific BAP of Kafkas University (Project No: 2021-TS-70).</p>
</sec>
<sec sec-type="COI-statement" id="s10">
<title>Conflict of interest</title>
<p>The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
<sec sec-type="ai-statement" id="s11">
<title>Generative AI statement</title>
<p>The author(s) declare that no Generative AI was used in the creation of this manuscript.</p>
</sec>
<sec sec-type="disclaimer" id="s12">
<title>Publisher&#x2019;s note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
</sec>
<ref-list>
<title>References</title>
<ref id="B1">
<citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname>Abushouk</surname>
<given-names>A. I.</given-names>
</name>
<name>
<surname>Salem</surname>
<given-names>A. M. A.</given-names>
</name>
<name>
<surname>Abdel-Daim</surname>
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