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Swimming in Plastamination: Polylactic Acid (PLA) Nanoplastics Affect Bull Sperm Functions
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Even "eco-friendly" plastics may not be as harmless as they sound: researchers found that nanoplastics from polylactic acid (PLA), a popular biodegradable plastic, can get inside bull sperm cells and settle into their mitochondria (the cell's energy source), slightly disrupting sperm movement and energy production. While the effects on sperm were modest even at high doses, this study is a reminder that as we swap traditional plastics for "biodegradable" alternatives, we still need to check whether they carry similar risks to reproductive health, since bull sperm is often used as a model for understanding human fertility.
Plastic contamination (plastamination) is one of the main challenges of the 21st century. Microplastics (MPs, 5 mm–1 µm) and nanoplastics (NPs, <1 µm) are mainly produced from the environmental degradation of plastic waste and enter the food chain, bypass biological barriers, and bioaccumulate in tissues where they exert toxic/inflammatory effects. In the male reproductive system, MP/NPs can cross the blood–testis barrier, impair spermatogenesis, and affect semen quality parameters. While biodegradable polymers like polylactic acid (PLA) may represent an ecofriendly alternative to carbon fossil polymers, their real effects in reproduction have been poorly investigated. In the present manuscript, the effects of increasing doses of rhodamine B-loaded PLA-NPs (170 ± 20 nm mean size) on the physiology of frozen–thawed bovine sperm were investigated using a computer-assisted sperm analyzer (CASA) and flow cytometry. Sperm kinetics revealed a significant effect of PLA-NPs on progressive motility at 60 min, with higher values at 200 and 300 µg/mL doses (p < 0.05 vs. control). Flow cytometry showed that PLA-NP exposure did not alter acrosomal integrity (PNA488+); however, the proportion of spermatozoa showing high mitochondrial potential (MitoDR+) was significantly reduced compared to controls at a 300 µg/mL PLA-NP dose after 120 min of incubation. The proportion of spermatozoa metabolically active (MitoDR+) with contextual membrane destabilization (M540+) was significantly lower in samples with 200 and 300 µg/mL PLA, independently of the incubation time. Finally, immunofluorescence analysis revealed the internalization of PLA-NPs within spermatozoa at the longest exposure time. In conclusion, PLA-NPs are internalized in spermatozoa, with specific localization in mitochondria, and slightly affect progressive motility mainly by mitochondrial interference and plasma membrane destabilization. Despite limited effects on post-thaw bull sperm motility even at high doses, plastamination warrants consideration, and further studies on the biological effects of biodegradable plastics are recommended to preserve sperm physiology.
More Papers Like This
Polylactic Acid Micro/Nanoplastic Exposure Induces Male Reproductive Toxicity by Disrupting Spermatogenesis and Mitochondrial Dysfunction in Mice
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Even so-called "eco-friendly" biodegradable plastic (polylactic acid, or PLA) was found to cause reproductive harm in male mice. After breaking down in the digestive system, tiny PLA nanoparticles crossed into the testes and damaged sperm quality, mitochondria (the energy producers in cells), and hormone levels. This challenges the assumption that biodegradable plastics are safe and highlights potential risks to male fertility.
Swimming in Plastamination: Poly-lactic Acid Nanoplastics and Sperm Functions
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This conference paper examines the effects of PLA nanoplastics on sperm function, finding that exposure impairs motility, membrane integrity, and mitochondrial activity in marine invertebrate and mammalian sperm models, identifying reproductive toxicity as a key concern for biodegradable plastic contamination.
Comment on “Polylactic Acid Micro/Nanoplastic Exposure Induces Male Reproductive Toxicity by Disrupting Spermatogenesis and Mitochondrial Dysfunction in Mice”
AI summary Read the abstract
A recent mouse study found that tiny plastic particles from polylactic acid (PLA), a "biodegradable" plastic used in things like food packaging and medical devices, can travel through the digestive system, enter the reproductive organs, and damage sperm production by harming the energy-producing parts of cells (mitochondria). This commentary points out an important wrinkle: PLA doesn't just sit in the body as plastic, it can break down into lactic acid, a substance the body already uses for energy, so some of the observed effects might be tied to how the body processes these breakdown products rather than the plastic particles alone. The takeaway for
Reply to “Comment on ‘Polylactic Acid Micro/Nanoplastic Exposure Induces Male Reproductive Toxicity by Disrupting Spermatogenesis and Mitochondrial Dysfunction in Mice’”
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This is a scientific back-and-forth (not a new study) where researchers defend their earlier finding that tiny plastic particles from PLA, a "biodegradable" plastic used in things like food packaging and 3D printing, can harm sperm production and cell energy function in male mice. The exchange addresses valid criticism about whether the type of plastic breaks down differently in the body, but doesn't overturn the original concern: even "eco-friendly" plastics may pose reproductive health risks that deserve more research before we assume they're safe alternatives to regular plastic.
Microplastics are detected in bull epididymal sperm and polystyrene microparticles impair sperm fertilization
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Researchers found microplastics in all bull sperm samples tested, and when they exposed bovine sperm to polystyrene particles at concentrations matching those found naturally, the sperm's ability to fertilize eggs dropped significantly. Embryos produced from the exposed sperm also showed increased cell death and oxidative damage. This is one of the first studies to demonstrate that microplastics at levels already present in reproductive tissues can directly impair fertility.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.