Plastic products have become an indispensable part of human life in the modern world. They are widely used in food packaging, daily manufacturing, and medical equipment, among other fields. However, with the widespread use of plastic products, plastic pollution has become increasingly severe. If this trend continues, it is estimated that plastic production will continue to affect the natural environment by 2050 (Roland, 2017). Among them, microplastics and nanoplastics (MNPs) pollution, an emerging environmental pollutant, has attracted much attention (Osman et al., 2023). MNPs are plastic particles with a diameter of less than 5 mm, and their common chemical ingredients include polyethylene, polyvinyl chloride, polystyrene, and polypropylene. These contaminants originate from the wear and tear of plastic products, decomposition of plastic waste, and artificial addition of MNPs particles. MNPs are widely distributed in water, soil, air, and food, and humans are exposed to MNPs through diet, breathing, and skin contact (Figure 1). Once released into nature, MNPs trigger a series of toxicological events (Legler and Legler, 2021). MNPs also pollute the environment through ocean currents, atmospheric winds, and terrestrial phenomena, thus becoming a global environmental pollution problem (Wang et al., 2020).

With continued research on MNPs pollution, scientists have begun to discover that MNPs may have a negative impact on human health (SAPEA, 2019; Ali et al., 2024). Several studies have reported that MNPs are found in human tissues, such as the lung, liver, urine, blood, placenta, and breast milk, by noninvasive imaging methods (Table 1) (Jenner et al., 2022; Horvatits et al., 2022; Pironti et al., 2022; Leslie et al., 2022; Ragusa et al., 2021; Ragusa et al., 2022). A recent study suggested that there may be a link between MNPs exposure and cardiovascular disease (CVD), potentially through the induction of toxicity at microvascular sites, resulting in an abnormal heart rate, impaired cardiac function, pericardial effusion and myocardial fibrosis (Zhu et al., 2023). CVD, which includes hypertension, coronary heart disease, and heart failure, is a major cause of death worldwide and poses a serious threat to human health. Due to the omnipresence of MNPs in the environment, exploring the relationship between MNPs and CVD has important scientific and practical significance. The objective of this review is to provide a comprehensive overview of the current state of knowledge regarding the correlation between MNPs and CVD and to identify any gaps in the literature.

MNPs are major environmental pollutants with potential cellular effects and have raised concerns about their impact on human health. First, plastic particles can be categorized by size into microplastics (MPs) (5 mm–1 μm), submicroplastics (1 μm–100 nm), and nanoplastics (NPs) (less than 100 nm) (Caldwell et al., 2022), and their size is a key factor influencing their cellular interactions. Smaller particles, especially at the nanoscale, can more easily cross biological barriers and penetrate cells. A study has shown that MNPs smaller than 10–15 µm can be internalized by cells, leading to potentially cytotoxic effects (Prata et al., 2020). The ability of these particles to penetrate cell membranes and accumulate in cells raises great concern about their potential health effects. Second, MNPs come from primary and secondary sources. Primary MNPs are intentionally produced for use in products such as cosmetics and detergents, while secondary MNPs are the result of the degradation of larger pieces of plastic (Hanun et al., 2021). Plastics degrade in the environment due to UV radiation, wave action and temperature fluctuations and form secondary MNPs, which then enter various ecosystems and food chains. The surface properties of MNPs, such as roughness and charge, can significantly influence their interactions with biological systems. Particularly, weathering processes can change surface properties and make surfaces more hydrophobic or hydrophilic, which in turn influences the adsorption of environmental pollutants (Imhof et al., 2016). When MNPs enter the bloodstream, they interact with various proteins to form a protein corona. This aggregation can induce conformational changes and protein denaturation, resulting in the formation of non-biocompatible complexes. A more hydrophilic protein corona may mitigate the immune response and extend the circulation time of MNPs in the bloodstream, thereby influencing their biodistribution and potential toxicity (Gopinath et al., 2019). In addition, the type of polymer (such as polyethylene, polypropylene, polyvinyl chloride or polystyrene) can also influence the effects of MNPs on cells. Polystyrene MPs have been found to cause oxidative stress and neurotoxic effects in aquatic organisms (Danopoulos et al., 2022). However, the specific mechanisms by which MNPs cause cellular effects are not yet fully understood. Further research is needed to investigate these processes and develop strategies to mitigate the impact of MNPs on the environment and human health.

Preclinical studies have shown that exposure to MNPs may be associated with the development and progression of CVD (Figure 1). In a recent prospective multicenter observational study, polyvinyl chloride was detected in more than 70 patients with asymptomatic carotid stenosis who had undergone carotid endarterectomy, and a cohort follow-up revealed that patients whose plaques contained MNPs had a greater composite risk of myocardial infarction, stroke, or death from all causes (Marfella et al., 2024). In another study, MPs were detected not only in carotid plaques but also in coronary arteries with atherosclerotic plaques and in aortas without plaques by pyrolysis gas chromatography/mass spectrometry (Py-GC/MS). Most importantly, the concentration of MPs in arteries, coronary arteries and carotid arteries containing atherosclerotic plaques is significantly greater than that in aortas without atherosclerotic plaques (Liu et al., 2024). These results indicate that MPs are involved in the development of atherosclerosis. In addition to the discovery of MPs in human organs potentially exposed to the external environment, recent studies using laser direct infrared chemical imaging systems and scanning electron microscopy have detected MPs in completely sealed human organ tissues (pericardial and extracardiac) from patients undergoing cardiac surgery. MPs have also been detected in membranes, myocardium and venous blood, providing direct evidence of MPs in patients undergoing cardiac surgery (Yang et al., 2023). Recent studies have highlighted that MNPs can induce alterations in cardiac structure and may even lead to damage in targer organs. In an angiotensin II-induced hypertension mouse model, the ingestion of a diet containing MNPs (specifically polystyrene) resulted in an increased cardiac hypertrophy index, reduced cardiac output, and increased renal fibrosis gene expression in mice (Fuckert et al., 2023). Furthermore, the ingestion of polystyrene MNPs was associated with increased body fat and weight gain in mice, thereby promoting the development of cardiometabolic disease phenotypes (Zhao et al., 2022). Another study demonstrated that MPs induced cardiac hypertrophy in both in vivo and in vitro models at low doses equivalent to human internal exposure (Zhou et al., 2023). Moreover, MPs have been shown to exert cardiotoxic effects, leading to pericardial edema, bradycardia (slow heart rate), abnormal rhythm, and myocardial fibrosis in fish cardiac tissues (Persiani et al., 2023). Additionally, one study indicated that in mouse models, oral administration of polystyrene NPs can induce myocardial structural abnormalities, elevate reactive oxygen species (ROS) levels in myocardial tissue, and trigger oxidative stress while activating the TGFβ1/Smad signaling pathway. This cascade results in increased fibrin and collagen deposition, ultimately contributing to myocardial fibrosis, which adversely affects both the structural integrity and functional performance of the heart (Lin et al., 2022). Similarly, polystyrene MPs induce cardiac fibrosis in rats by activating the Wnt/β-catenin signaling pathway and promoting cardiomyocyte apoptosis (Li et al., 2020). These studies suggest that the intake of MNPs may cause structural changes in the heart and even target organ damage, potentially representing an unrecognized risk factor for CVD.

MNPs are closely related to CVD; therefore, the underlying mechanisms need to be further explored (Figure 2). MNPs can enter the human body in many ways, including drinking contaminated water, ingesting contaminated food (e.g., seafood), and inhaling MNPs in the air. Once in the body, they can enter the lungs and subsequently be transferred to the bloodstream, depending on size. One study has reported that the concentration of detectable plastic particles in human blood is approximately 1.6 μg/mL (Leslie et al., 2022). In comparison to conventional blood components, such as low-density lipoprotein (LDL), the concentration of plastic particles is typically low. However, with the rise in environmental pollution, it is anticipated that the concentration of plastic particles in the bloodstream may gradually increase over time. Thus, dietary habits and the consumption of biologically active nutrients are crucial for cardiovascular health (Cverenkarova et al., 2021).

Although current research on potential drug treatment targets for CVD is still in its infancy, some potential treatment targets can be speculated based on the various mechanisms by which MNPs affect the cardiovascular system (Figure 3). Due to their small size and large surface area, MNPs can interact with cells and tissues in organisms and induce local or systemic inflammatory responses. A recent study suggested that MPs significantly aggravate systemic inflammation caused by a high-fat diet in individuals with obesity by activating peripheral and central inflammatory immune cells (Lee et al., 2023). These inflammatory responses may be associated with a range of CVDs. Anti-inflammatory treatments typically involve the use of drugs to inhibit inflammatory pathways, reduce the production of inflammatory mediators, and modulate the immune response. Moreover, the oxidative stress cascade was activated by exposure to MNPs. A study on the effects and potential mechanisms of polystyrene NPs on the aging of porcine coronary artery endothelial cells showed that exposure to polystyrene NPs promotes premature aging of endothelial cells, as evidenced by the loss of cell proliferation, activation of reactive oxygen species and impaired vasodilation, whereas antioxidants (N-acetylcysteine, NAC), NADPH oxidase inhibitors (apocynin, APO) and Sirt1 activators (resveratrol, RES) had a preventive effect on polystyrene-induced endothelial cell senescence and dysfunction (Shiwakoti et al., 2022). Therefore, anti-inflammatory and antioxidant treatments may help to reduce the inflammatory damage caused by MNPs, protect tissues from damage, and reduce the negative effects of MNPs on the cardiovascular system and other organs (Hu and Palic, 2020). Anti-inflammatory drugs are a potential treatment option. Nonsteroidal anti-inflammatory drugs (NSAIDs), such as aspirin, corticosteroids, and biologics, may reduce the risk of MNPs by inhibiting inflammatory factors such as NF-κB, TNF-α, IL-1β, IL-6, and IL-8 (Henein et al., 2022). Treatment with antioxidants may help to mitigate this potential effect. In one study, melatonin was found to reduce ischemia‒reperfusion injury caused by MPs accumulation, suggesting that natural antioxidants may help protect cells from oxidative damage (Missawi et al., 2023). MNPs may also affect the coagulation system. One study reported that NPs can be detected in human blood and that exposure to NPs can lead to coagulation disorders and prothrombotic conditions (Wang X. et al., 2023). Therefore, medications such as antiplatelet agents (aspirin), anticoagulants (warfarin) and fibrinolytics may help prevent or treat thrombosis caused by MNPs. In addition, MNPs may impair endothelial function, thereby promoting leukocyte adhesion, a critical step in the processes of vascular inflammation and the development of atherosclerosis (Vlacil et al., 2021). Therefore, drugs to protect endothelial cells, such as nitrates, statins and angiotensin converting enzyme inhibitors (ACEIs), may help maintain vascular health. Similarly, exposure to MPs is mainly associated with changes in the physicochemical or biological properties of red blood cells, including a reduction in membrane composition, disruption of bilayer thickness and intrinsic lipid curvature. These results indicate that the membrane function of blood cells is impaired (Wang et al., 2022). Therefore, treatments that promote the repair and stabilization of cell membranes may mitigate the harmful effects of MPs. The last and most fundamental treatment possible is the removal of MNPs. Although there are currently no drugs that specifically target MNPs, researchers could explore ways to promote the elimination of MNPs from the body, such as by enhancing the detoxification functions of the liver and kidneys and their excretion via the gastrointestinal tract. In summary, the investigation of drug treatment targets for CVD caused by MNPs is an emerging field of research that requires further scientific research.

In summary, the evidence linking MNPs to CVD is rapidly emerging, highlighting critical pathways through which these environmental pollutants may contribute to cardiovascular health risks. Current studies demonstrate that MNPs can infiltrate human tissues and trigger a range of toxicological responses, including inflammation, oxidative stress, and alterations in lipid metabolism, which collectively may exacerbate CVD. Although significant strides have been made in understanding the cellular and molecular mechanisms involved, extensive research is still needed to elucidate the precise pathways through which MNPs impact cardiovascular health. Future studies should prioritize large-scale epidemiological investigations and long-term cohort studies to provide comprehensive insights into the correlation between MNPs exposure and CVD outcomes. Furthermore, there is an urgent need for the development of innovative strategies aimed at reducing MNPs pollution, which could mitigate its potential health impacts. This may include advancing recycling technologies, promoting biodegradable alternatives, and improving waste management practices. Ultimately, a multidisciplinary approach, combining toxicological research with public health policy and environmental science, will be essential to address the challenges posed by MNPs and safeguard cardiovascular health in the context of an increasingly plastic-laden environment.