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Am J Physiol Renal Physiol 273: F916-F924, 1997;
0363-6127/97 $5.00
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AJP - Renal Physiology, Vol 273, Issue 6 916-F924, Copyright © 1997 by American Physiological Society

ARTICLES

Bradykinin induces tubulin phosphorylation and nuclear translocation of MAP kinase in mesangial cells

A. A. Jaffa, B. S. Miller, S. A. Rosenzweig, P. S. Naidu, V. Velarde and R. K. Mayfield
Department of Medicine, Medical University of South Carolina, Charleston, USA.

Glomerular hypertension and glomerular hypertrophy act early and synergistically to promote glomerular injury in diabetes. We have previously shown that increased renal kinin production contributes to the glomerular hemodynamic abnormalities associated with diabetes. Glomerulosclerosis, characterized by mesangial cell proliferation and matrix expansion, is the final pathway leading to renal failure. The signal(s) initiating mesangial cell proliferation is ill defined. In the present study, we utilized immunofluorescence, immunoprecipitation, and immunoblotting techniques to identify substrates that are tyrosine phosphorylated in response to bradykinin action in mesangial cells. Immunofluorescence microscopy of mesangial cells stained with anti-phosphotyrosine (anti-PY) antibodies following bradykinin treatment (10(-9)-10(-6) M) revealed a dose-dependent increase in the labeling of cytoplasmic and nuclear proteins. Immunoprecipitation with anti-PY, followed by immunoblot revealed bradykinin-induced tyrosyl phosphorylation of tubulin and mitogen-activated protein kinase (MAPK). Confocal microscopy of mesangial cells stained for MAPK indicated that bradykinin stimulation resulted in translocation of MAPK from the cytoplasm to the nucleus by 2 h. These data demonstrate that bradykinin action results in the tyrosine phosphorylation of cellular proteins in mesangial cells and suggest a role for tubulin and MAPK in the signaling cascade of bradykinin leading to altered mesangial function.


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