title: AngII-induced glomerular mesangial cell proliferation inhibited by losartan via changes in intracellular calcium ion concentration.
abstract: This study investigated the changes in intracellular [Ca(2+)](i) (intracellular calcium ion concentration) and TRPC6 (transient receptor potential channel 6) expression during angiotensin II (AngII)-induced glomerular mesangial cell (GMC) proliferation, as well as the inhibitory effect of losartan. GMC cultures were split into four groups treated for 24 h: Group N (blank control group), Group A (10(-7 )mol/L AngII), Group LT (10(-7 )mol/L AngII and 10(-5 )mol/L losartan), and Group Pred (10(-7 )mol/L AngII and 10(-5 )mol/L prednisone). GMCs proliferation was measured by the MTT and trypan blue assays. The distribution of TRPC6 was monitored by immunofluorescence, the expression of TRPC6 was detected by RT-PCR and Western blotting, and [Ca(2+)](i) was measured by laser scanning confocal microscopy. The results showed that the maximal proliferation of GMCs was induced by treatment with 10(-7 )mol/L AngII for 24 h. In Group A, the distribution of TRPC6 was not uniform in the cell membrane, there was increased accumulation of this protein within the cytoplasm, and the increased expression of TRPC6 and [Ca(2+)](i) was consistent with the proliferation of cells. In Group LT, losartan inhibited the proliferation of GMCs significantly, the levels of TRPC6 and [Ca(2+)](i) were diminished, and the distribution of TRPC6 was improved. Prednisone also significantly inhibited the proliferation of GMCs and had no effects on the expression of TRPC6 and [Ca(2+)](i) in Group Pred. These findings suggested that AngII could enhance the expression of TRPC6, increase [Ca(2+)](i,) and demonstrate a time-dose-response relationship with the proliferation of GMCs, while losartan reversed the effect of AngII on GMC proliferation.
authors: The Second Affiliated Hospital of Guangzhou Medical University, No. 195 Dongfeng Xi Road, Guangzhou, 510182, China.
authors: Guoying
authors: G
authors: Qiu
authors: Zequan
authors: Z
authors: Ji
mesh_terms: D000804:Angiotensin II / Q000378:metabolism*; D015153:Blotting, Western; D002118:Calcium / Q000032:analysis*; D002413:Cations, Divalent / Q000032:analysis; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects*; D003593:Cytoplasm / Q000737:chemistry*; D020869:Gene Expression Profiling; D006801:Humans; D019808:Losartan / Q000378:metabolism*; D050527:Mesangial Cells / Q000187:drug effects* / Q000502:physiology*; D018613:Microscopy, Confocal; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013194:Staining and Labeling / Q000379:methods; D050052:TRPC Cation Channels / Q000096:biosynthesis; D000074287:TRPC6 Cation Channel; D013778:Tetrazolium Salts / Q000378:metabolism; D013844:Thiazoles / Q000378:metabolism; D014343:Trypan Blue / Q000378:metabolism
chemical_list: D002413:Cations, Divalent; D050052:TRPC Cation Channels; D000074287:TRPC6 Cation Channel; C117032:TRPC6 protein, human; D013778:Tetrazolium Salts; D013844:Thiazoles; D000804:Angiotensin II; C022616:thiazolyl blue; D014343:Trypan Blue; D019808:Losartan; D002118:Calcium