The integration of plastics into textiles and clothing creates a direct pathway for micro- and nanoplastics (MNPs) to interact with the human body through dermal contact, potentially leading to systemic health issues such as hormone disruption and cancer.
1. Textiles as a Primary Source of Plastic Exposure
Synthetic textiles and garments are among the most significant sources of primary microplastics. These fabrics constantly shed microfibers through fragmentation and erosion during daily wear. This shedding occurs both directly onto the skin and into the indoor air, where it contributes to high concentrations of plastic particles in house dust. Beyond clothing, other textile-related products like tampons and period products have been shown to release billions of nanoplastic fibers during use.
2. Dermal Absorption and the "Trojan Horse" Effect
While the skin is a formidable barrier, MNPs can bypass it, particularly through the transappendageal pathway involving hair follicles and sweat glands.
- Leaching of Additives: When plastic fibers from textiles contact the skin, they interact with the Skin Surface Film Liquid (SSFL)—a mixture of sweat and sebum. This oily environment acts as a solvent, causing toxic additives like Brominated Flame Retardants (BFRs), phthalates, and Bisphenol A (BPA) to leach out of the plastic particles.
- Bioaccessibility: Research has confirmed that these chemicals become "bioaccessible" (available for absorption) within an hour of skin contact. Smaller particles, such as those under 0.45 mm, exhibit significantly higher leaching rates due to their larger surface area.
3. Hormone Disruption (Endocrine Interference)
The chemicals leached from textile plastics are often potent endocrine disruptors.
- BPA and Phthalates: These common plasticizers can be absorbed dermally. BPA is known to mimic endogenous hormones, which can disrupt lipid metabolism and has been linked to medical conditions such as obesity and diabetes.
- Flame Retardants: Additives like PBDEs and HBCDD, often found in synthetic materials, are explicitly linked to endocrine disruption and reproductive toxicity.
4. Carcinogenesis and Cancer Risks
Long-term exposure to MNPs and their associated chemicals can create a pro-cancer environment in the body.
- Chronic Inflammation: Internalized plastic particles trigger the release of pro-inflammatory mediators and induce oxidative stress, both of which are recognized contributors to carcinogenesis.
- DNA Damage: Evidence suggests that MNPs can cause genotoxicity (direct DNA damage) and interfere with cell signaling pathways that regulate cell growth and apoptosis.
- Tumor Proliferation: In vitro studies on skin cancer cell lines have shown that microplastics can enhance tumor cell proliferation and accelerate the cell cycle. Furthermore, by acting as vectors for other environmental pollutants like heavy metals, plastics amplify the total carcinogenic load entering the body.
Conclusion: The plastic fibers in our clothing do not merely sit on the surface of the skin; they release a cocktail of hazardous chemicals and microscopic particles that can penetrate the dermal barrier, potentially leading to long-term systemic health risks, including hormonal imbalances and various types of cancer