Microplastics Found in Human and Canine Testicular Tissues: Implications for Reproductive Health

Monday - May 27 2024, 13:00 UTC - 5 months ago

University of New Mexico researchers have discovered significant levels of microplastics in human and canine testicular tissues, with correlations between certain types of plastic and lower sperm count in dogs. Further research is needed to determine the potential impact of microplastic exposure on reproductive health.

Scientists at the University of New Mexico have detected significant concentrations of microplastics in the testicular tissue of both humans and dogs, adding to growing concern about their possible effect on human reproductive health. These small plastic particles, less than 5 millimeters in size, have become ubiquitous in our environment, and their potential impact on human and animal health is not yet fully understood.

The study, published in Toxicological Sciences, reported finding 12 types of microplastics in 47 canine and 23 human testes. Led by Dr. Xiaozhong “John” Yu, the research team used a novel analytical method to quantify the amount of microplastics in the tissue samples. They discovered correlations between certain types of plastic and reduced sperm count in the canine samples, raising concerns about the potential effects of microplastic exposure on reproductive health.

According to Dr. Yu, heavy metals, pesticides, and endocrine-disrupting chemicals have all been implicated in a global decline in sperm count and quality in recent years. However, a conversation with his colleague Dr. Matthew Campen, who had previously discovered microplastics in human placentas, led him to wonder if there was another factor at work.

Dr. Yu's team obtained anonymized human tissue samples from the New Mexico Office of the Medical Investigator, while canine tissue came from City of Albuquerque animal shelters and private veterinary clinics. After chemically treating the samples and spinning them in an ultracentrifuge, they were able to identify and analyze the microplastics using a mass spectrometer.

Results showed that the average concentration of microplastics in canine testicular tissue was 122.63 micrograms per gram of tissue, while in human tissue it was 329.44 micrograms per gram – nearly three times higher. The species most prominently detected in both human and canine testes was PVC, which is commonly found in pipes, flooring, and household products. PVC is known to release a toxic chemical called vinyl chloride monomer as it degrades.

Initially, Dr. Yu had doubts about whether microplastics could even penetrate the reproductive system, but the results of this study have changed his perspective. He plans to continue his research on the potential impacts of microplastic exposure on reproductive health, and urges for more studies to be done in order to fully understand the potential risks.