Related Experiment Videos
Effect of mesangial cell lysis and proliferation on glomerular hemodynamics in the rat
T Yamamoto1, C A Mundy, C B Wilson
1Department of Immunology, Research Institute of Scripps Clinic, La Jolla, California.
Abstract:
To elucidate an involvement of mesangial cells in the regulation of glomerular hemodynamics, renal micropuncture techniques and glomerular morphometry were employed in Munich-Wistar rats with mesangial cell lytic or proliferative lesions induced by administration of an antibody reactive with Thy-1.1-like antigens on the mesangial cell surface. The antibody-induced mesangial cell lysis at day 1 resulted in a significant decrease in glomerular ultrafiltration coefficient, leading to reduction in single nephron glomerular filtration rate (SNGFR) in spite of a significant increase in both glomerular hydrostatic pressure and single nephron plasma flow (SNPF). During the antibody-induced proliferative lesion at day 6, glomerular ultrafiltration coefficient and SNGFR remained reduced; however, SNPF was now decreased. Morphometric analysis showed the enlargement of capillary luminal volume and the development of new open space in the mesangium accessible for blood flow in the mesangial cell-lytic glomeruli at day 1. An increase in mesangial cell volume was found in the proliferative glomeruli at day 6. The total area of peripheral glomerular basement membrane, presumed as the probable filtration area, was unchanged in these glomeruli. These results indicate that mesangial lesions decrease glomerular ultrafiltration coefficient, and suggest that mesangial cells participate in regulation of glomerular filtration rate.
Insights
Mesangial cell lesions significantly reduce the glomerular ultrafiltration coefficient, impacting kidney function. This study suggests mesangial cells play a key role in regulating glomerular filtration rate.
Area of Science:
- Nephrology
- Renal Physiology
- Cell Biology
Background:
- Mesangial cells are crucial for glomerular structure and function.
- Understanding their role in regulating glomerular hemodynamics is essential for kidney disease research.
Purpose of the Study:
- To investigate the involvement of mesangial cells in regulating glomerular hemodynamics.
- To determine the impact of mesangial cell lesions on kidney filtration.
Main Methods:
- Utilized renal micropuncture techniques and glomerular morphometry in Munich-Wistar rats.
- Induced mesangial cell lytic and proliferative lesions using anti-Thy-1.1 antibody.
Main Results:
- Mesangial cell lysis decreased glomerular ultrafiltration coefficient and single nephron glomerular filtration rate (SNGFR).
- Glomerular ultrafiltration coefficient and SNGFR remained reduced during proliferative lesions, with decreased single nephron plasma flow (SNPF).
- Morphometry revealed changes in mesangial cell volume and capillary luminal space, affecting blood flow accessibility.
Conclusions:
- Mesangial cell lesions directly decrease the glomerular ultrafiltration coefficient.
- Mesangial cells are integral to the regulation of glomerular filtration rate and overall kidney function.