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Am J Physiol Renal Physiol 275: F343-F352, 1998;
0363-6127/98 $5.00
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Vol. 275, Issue 3, F343-F352, September 1998

Bradykinin stimulates the ERKright-arrow Elk-1right-arrow Fos/AP-1 pathway in mesangial cells

Samir S. El-Dahr1, Susana Dipp1, and William H. Baricos2

1 Section of Pediatric Nephrology, Department of Pediatrics, and 2 Department of Biochemistry, Tulane University School of Medicine, New Orleans, Louisiana 70112

Among its diverse biological actions, the vasoactive peptide bradykinin (BK) induces the transcription factor AP-1 and proliferation of mesangial cells (S. S. El-Dahr, S. Dipp, I. V. Yosipiv, and W. H. Baricos. Kidney Int. 50: 1850-1855, 1996). In the present study, we examined the role of protein tyrosine phosphorylation and the mitogen-activated protein kinases, ERK1/2,in mediating BK-induced AP-1 and DNA replication in cultured rat mesangial cells. BK (10-9 to 10-7 M) stimulated a rapid increase in tyrosine phosphorylation of multiple proteins with an estimated molecular mass of 120-130, 90-95, and 44-42 kDa. Immunoblots using antibodies specific for ERK or tyrosine-phosphorylated ERK revealed a shifting of p42 ERK2 to a higher molecular weight that correlated temporally with an increase in tyrosine-phosphorylated ERK2. Genistein, a specific tyrosine kinase inhibitor, prevented the phosphorylation of ERK2 by BK. In-gel kinase assays indicated that BK-induced tyrosine phosphorylation of ERK2 is accompanied by fourfold activation of its phosphotransferase activity toward the substrate PHAS-I (P < 0.05). Furthermore, BK stimulated a 2.5-fold increase (P < 0.05) in phosphorylation of Elk-1, a transcription factor required for growth factor-induced c-fos transcription. In accord with the stimulation of Elk-1 phosphorylation, BK induced c-fos gene expression and the production of Fos/AP-1 complexes. In addition, thymidine incorporation into DNA increased twofold (P < 0.05) following BK stimulation. Each of these effects was blocked by tyrosine kinase inhibition with genistein or herbimycin A. Similarly, antisense oligodeoxynucleotide targeting of ERK1/2 mRNA inhibited BK-stimulated DNA synthesis. In contrast, protein kinase C inhibition or depletion had no effect on BK-induced c-fos mRNA, AP-1-DNA binding activity, or DNA synthesis. Collectively, these data demonstrate that BK activates the ERKright-arrowElk-1right-arrowAP-1 pathway and that BK mitogenic signaling is critically dependent on protein tyrosine phosphorylation.

G protein-coupled receptors; mitogen-activated protein kinase kinase; signal transduction; cell growth


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