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Bradykinin-induced inhibition of cell proliferation and tyrosine kinase activity in rat mesangial cells.

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The relationship between cell proliferation, protein tyrosine phosphorylation, phosphotyrosine kinase activity and bradykinin receptor activation in rat mesangial cells was investigated. We demonstrated that bradykinin (BK), through the B2 receptor, induced a dose-dependent inhibition of mesangial cell proliferation stimulated by fetal calf serum. We next found that BK induced a dose-dependent inhibition of phospho-tyrosine kinase activity. Treatments with pertussis-toxin, inhibition of phospholipase C and protein kinase C inhibitors and chelation of free cytosolic calcium did not change the bradykinin-induced inhibition of phosphotyrosine kinase. Western blot analysis of phosphotyrosinated proteins demonstrated that BK reduced tyrosine phosphorylation of several proteins among which we identified the 125-focal adhesion kinase. Taken together, these data suggest for the first time that, in proliferating rat mesangial cells, B2 receptor stimulation is able to induce, via a pertussis insensitive pathway, the inhibition of tyrosine kinase activity and mesangial cell proliferation.
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Document Type: Research Article

Affiliations: Institut National de la Sante et de la Recherche Medicale, INSERM U388, Institut Louis Bugnard, CHU Rangueil, 31052 Toulouse, France.

Publication date: January 1, 2000

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  • The International Journal of Molecular Medicine is a monthly, peer-reviewed journal devoted to the publication of high quality studies related to the molecular mechanisms of human disease. The journal welcomes research on all aspects of molecular and clinical research, ranging from biochemistry to immunology, pathology, genetics, human genomics, microbiology, molecular pathogenesis, molecular cardiology, molecular surgery and molecular psychology.

    The International Journal of Molecular Medicine aims to provide an insight for researchers within the community in regard to developing molecular tools and identifying molecular targets for the diagnosis and treatment of a diverse number of human diseases.
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