Nanoplastic impact on bone microenvironment: A snapshot from murine bone cells

Area of Science:

• Environmental Health
• Toxicology
• Cell Biology

Background:

• Plastic waste is a global issue, generating nanoplastics (NPs) that enter the food chain.
• NPs' impact on human health is understudied, with emerging evidence linking them to oxidative stress (OS).
• OS is known to affect bone remodeling processes.

Purpose of the Study:

• To investigate the effects of nanoplastics on bone cell remodeling.
• To determine if nanoplastics induce oxidative stress in bone cells.
• To assess nanoplastics' influence on bone turnover and potential public health implications.

Main Methods:

• Utilized murine bone cell cultures: MC3T3-E1 (preosteoblasts), MLOY-4 (osteocyte-like), and RAW264.7 (pre-osteoclasts).
• Assessed cell viability, reactive oxygen species (ROS) production, and apoptosis (caspase 3/7 activation).
• Evaluated preosteoblast migration, osteoclastogenesis, and gene expression related to bone remodeling pathways.

Main Results:

• NPs decreased cell viability and increased ROS production and apoptosis across all tested bone cell types.
• NPs inhibited preosteoblast migration and enhanced preosteoclast differentiation (osteoclastogenesis).
• NPs altered gene expression in inflammatory, osteoblastogenic, and osteoclastogenic pathways.

Conclusions:

• Nanoplastics exert detrimental effects on bone cells, impacting viability, proliferation, and differentiation.
• NPs-induced oxidative stress and altered gene expression disrupt normal bone remodeling.
• These findings highlight potential risks of nanoplastics exposure for bone health and public health.