A Jeonbuk National University study published in the Journal of Hazardous Materials revealed that fine particulate matter (PM2.5) exposure accelerates bone marrow stem cell aging in mice, with damage significantly amplified by Type 2 diabetes. The exposure triggered NLRP3 inflammasome activation, leading to increased bone marrow fat accumulation, reduced femur bone mineral density, and impaired blood cell regeneration. Treating mice with the NLRP3 inhibitor MCC950 mitigated these inflammatory and cellular effects.
Exacerbated effects in diabetic mice
- ▪In diabetic mice, PM2.5 exposure triggered stronger lung inflammation, worsened liver injury, and increased fat accumulation in the liver compared to non-diabetic mice.
- ▪A Jeonbuk National University study in mice demonstrated that Type 2 diabetes amplified the cellular damage and stem cell aging caused by PM2.5 exposure.
- ▪PM2.5 exposure altered pancreatic islet structure in diabetic mice, causing reduced insulin expression and increased glucagon expression.
PM2.5 impact on stem cells
- ▪Despite the impaired regenerative capacity of blood-forming stem cells in PM2.5-exposed mice, overall blood counts and hemoglobin levels showed no significant changes.
- ▪A Jeonbuk National University study published in the Journal of Hazardous Materials found that PM2.5 air pollution exposure accelerated bone marrow stem cell aging in mice.
- ▪In atmospheric chamber experiments, exposing mice to 50 micrograms per cubic meter of PM2.5 for two hours daily over five days increased oxidative stress and DNA damage in bone marrow stem cells.
- ▪Transplantation experiments showed that bone marrow hematopoietic stem cells exposed to PM2.5 had a reduced capacity to multiply and replenish blood-forming cells in recipient mice.
Bone marrow fat and density changes
- ▪PM2.5 exposure shifted the differentiation balance of bone marrow mesenchymal stem cells toward fat cell formation rather than bone-forming cells.
- ▪Diabetic mice exposed to PM2.5 exhibited increased fat accumulation within their bone marrow structure compared to non-diabetic or unexposed mice.
- ▪A Jeonbuk National University study found PM2.5 exposure reduced overall femur bone mineral density in diabetic mice, but specific parameters of internal spongy bone tissue remained unaffected.
Role of the NLRP3 inflammasome
- ▪Jeonbuk National University researchers linked PM2.5-induced stem cell aging and inflammatory responses to the activation of the NLRP3 inflammasome cellular system.
- ▪Inhibition of the NLRP3 inflammasome by MCC950 decreased oxidative stress, DNA damage, and cellular senescence in bone marrow mesenchymal and hematopoietic stem cells.
- ▪Treating PM2.5-exposed mice with MCC950, a drug that inhibits the NLRP3 inflammasome, reduced inflammation in the lungs and bone marrow.
Story comments
Loading comments…