Harmful effects of the microplastic pollution on animal health: a literature review

Natalia Zolotova, Anna Kosyreva, Dzhuliia Dzhalilova, Nikolai Fokichev, Olga Makarova, Natalia Zolotova, Anna Kosyreva, Dzhuliia Dzhalilova, Nikolai Fokichev, Olga Makarova

Abstract

Background: The environmental pollution by microplastics is a global problem arising from the extensive production and use of plastics. Small particles of different plastics, measured less than 5 mm in diameter, are found in water, air, soil, and various living organisms around the globe. Humans constantly inhale and ingest these particles. The associated health risks raise major concerns and require dedicated evaluation.

Objectives: In this review we systematize and summarize the effects of microplastics on the health of different animals. The article would be of interest to ecologists, experimental biologists, environmental physicians, and all those concerned with anthropogenic environmental changes.

Methodology: We searched PubMed and Scopus from the period of 01/2010 to 09/2021 for peer-reviewed scientific publications focused on (1) environmental pollution with microplastics; (2) uptake of microplastics by humans; and (3) the impact of microplastics on animal health.

Results: The number of published studies considering the effects of microplastic particles on aquatic organisms is considerable. In aquatic invertebrates, microplastics cause a decline in feeding behavior and fertility, slow down larval growth and development, increase oxygen consumption, and stimulate the production of reactive oxygen species. In fish, the microplastics may cause structural damage to the intestine, liver, gills, and brain, while affecting metabolic balance, behavior, and fertility; the degree of these harmful effects depends on the particle sizes and doses, as well as the exposure parameters. The corresponding data for terrestrial mammals are less abundant: only 30 papers found in PubMed and Scopus deal with the effects of microplastics in laboratory mice and rats; remarkably, about half of these papers were published in 2021, indicating the growing interest of the scientific community in this issue. The studies demonstrate that in mice and rats microplastics may also cause biochemical and structural damage with noticeable dysfunctions of the intestine, liver, and excretory and reproductive systems.

Conclusions: Microplastics pollute the seas and negatively affect the health of aquatic organisms. The data obtained in laboratory mice and rats suggest a profound negative influence of microplastics on human health. However, given significant variation in plastic types, particle sizes, doses, models, and modes of administration, the available experimental data are still fragmentary and controversial.

Keywords: Experimental research; Health; Microplastics.

Conflict of interest statement

The authors declare that they have no competing interests.

© 2022 Zolotova et al.

Figures

Figure 1. Effects of microplastics (MP) on…
Figure 1. Effects of microplastics (MP) on fishes.
Figure 2. Effects of microplastics (MP) on…
Figure 2. Effects of microplastics (MP) on mice and rats.

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Source: PubMed

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