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Published on: August 9, 2019
PM2.5 Exposure Induces Glomerular Hyperfiltration in Mice in a Gender-Dependent Manner
Hao Wang1, Li Ma1, Yuqiong Guo1
1Shanxi Key Laboratory of Coal-Based Emerging Pollutant Identification and Risk Control, Research Center of Environment and Health, College of Environment and Resource, Shanxi University, Taiyuan 030006, China.
Fine particulate matter (PM2.5) exposure causes early kidney injury in female mice, leading to glomerular hyperfiltration. This occurs through renin-angiotensin system/kallikrein-kinin system imbalances and impaired tubuloglomerular feedback, highlighting gender-specific effects.
Area of Science:
- Environmental Health
- Toxicology
- Nephrology
Background:
- Fine particulate matter (PM2.5) is a prevalent air pollutant linked to various health issues, including renal system diseases.
- Previous research indicates PM2.5 exposure can negatively impact kidney function, but gender-specific effects are less understood.
Purpose of the Study:
- To investigate the impact of subchronic PM2.5 exposure on kidney function and identify potential mechanisms.
- To determine if there are gender-specific differences in PM2.5-induced renal injury.
Main Methods:
- Male and female C57BL/6J mice were exposed to PM2.5 for 8 weeks.
- Renal function was assessed using creatinine, BUN, uric acid, and urinary microalbumin.
- Kidney pathology and gene expression related to the renin-angiotensin system (RAS) and kallikrein-kinin system (KKS) were analyzed.
Main Results:
- Female mice exhibited early renal injury with glomerular hyperfiltration and enlarged glomeruli, unlike male mice.
- PM2.5 exposure disrupted the balance between RAS and KKS in females, increasing glomerular capillary hydrostatic pressure.
- In females, PM2.5 elevated blood glucose, impaired tubuloglomerular feedback (TGF), and induced renal hypoxia, contributing to hyperfiltration.
Conclusions:
- PM2.5 induces glomerular hyperfiltration and early kidney injury in female mice through RAS/KKS imbalance and TGF pathway disruption.
- The study reveals a significant gender-dependent effect of PM2.5 exposure on renal health.
- Findings underscore the importance of reducing ambient PM2.5 levels to mitigate kidney damage, especially in vulnerable populations.
