title: c-Abl mediates angiotensin II-induced apoptosis in podocytes.
abstract: Angiotensin II (Ang II) has been reported to cause podocyte apoptosis in rats both in vivo and in vitro studies. However, the underlying mechanisms are poorly understood. In the present study, we investigated the role of the nonreceptor tyrosine kinase c-Abl in Ang II-induced podocyte apoptosis. Male Sprague-Dawley rats in groups of 12 were administered either Ang II (400 kg/kg/min) or Ang II + STI-571 (50 mg/kg/day) by osmotic minipumps. In addition, 12 rats-receiving normal saline served as the control. Glomeruli c-Abl expression was carried out by real time PCR, Western blotting and immunolabeled, and occurrence of apoptosis was carried out by TUNEL staining and transmission electron microscopic analysis. In vitro studies, conditionally immortalized mouse podocytes were treated with Ang II (10(-9)-10(-6) M) in the presence or absence of either c-Abl inhibitor, Src-I1, specific c-Abl siRNA, or c-Abl plasmid alone. Quantification of podocyte c-Abl expression and c-Abl phosphorylation at Y245 and Y412 was carried out by real time PCR, Western blotting and immunofluorescence imaging. The nuclear c-Abl and p53 were quantified by co-immunoprecipitation and Western blotting studies. Podocyte apoptosis was analysed by flow cytometry and Hoechst-33342 staining. c-Abl expression was demonstrated in rat kidney podocytes in vivo and cultured mouse podocytes in vitro. Ang II-receiving rats displayed enhanced podocyte c-Abl expression. And Ang II significantly stimulated c-Abl expression in cultured podocytes. Furthermore Ang II upregulated podocyte c-Abl phosphorylation at Y245 and Y412. Ang II also induced an increase of nuclear p53 protein and nuclear c-Abl-p53 complexes in podocytes and podocyte apoptosis. Down-regulation of c-Abl expression by c-Abl inhibitor (Src-I1) as well as specific siRNA inhibited Ang II-induced podocyte apoptosis; conversely, podoctyes transfected with c-Abl plasmid displayed enhanced apoptosis. These findings indicate that c-Abl may mediates Ang II-induced podocyte apoptosis, and inhibition of c-Abl expression can protect podocytes from Ang II-induced injury.
authors.affiliation: Division of Nephrology, Renmin Hospital of Wuhan University, 238 Jiefang Rd, Wuhan, 430060, Hubei, China.
authors.forename: Xinghua
authors.initials: X
authors.lastname: Chen
authors.forename: Zhilong
authors.initials: Z
authors.lastname: Ren
authors.forename: Wei
authors.initials: W
authors.lastname: Liang
authors.forename: Dongqing
authors.initials: D
authors.lastname: Zha
authors.forename: Yipeng
authors.initials: Y
authors.lastname: Liu
authors.forename: Cheng
authors.initials: C
authors.lastname: Chen
authors.forename: Pravin C
authors.initials: PC
authors.lastname: Singhal
authors.forename: Guohua
authors.initials: G
authors.lastname: Ding
mesh_terms: D000804:Angiotensin II / Q000378:metabolism* / Q000494:pharmacology; D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D001549:Benzamides / Q000494:pharmacology; D002461:Cell Line, Transformed; D005786:Gene Expression Regulation / Q000187:drug effects*; D000068877:Imatinib Mesylate; D015918:Infusion Pumps, Implantable; D008297:Male; D051379:Mice; D010766:Phosphorylation; D010879:Piperazines / Q000494:pharmacology; D050199:Podocytes / Q000187:drug effects / Q000378:metabolism* / Q000473:pathology; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D016315:Proto-Oncogene Proteins c-abl / Q000037:antagonists & inhibitors / Q000235:genetics* / Q000378:metabolism; D011743:Pyrimidines / Q000494:pharmacology; D034741:RNA, Small Interfering / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D015398:Signal Transduction; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism
chemical_list: D001549:Benzamides; D010879:Piperazines; D047428:Protein Kinase Inhibitors; D011743:Pyrimidines; D034741:RNA, Small Interfering; D016159:Tumor Suppressor Protein p53; D000804:Angiotensin II; D000068877:Imatinib Mesylate; D016315:Proto-Oncogene Proteins c-abl