Recent studies have demonstrated important roles of α-actinins in glomerular disease, while little information is known about the expression profile of α-actinins in human glomerular mesangial cells. Here, immunofluorescence and confocal microscopy showed that α-actinin-1 exclusively distributed along mesangial cells in human glomeruli of IgA nephropathy. RT-PCR and Western blot further confirmed the expression of α-actinin-1 in primary cultured human mesangial cells. We also found that transforming growth factor-β 1 (TGF-β 1) stimulated ACTN1 gene transcription and that transiently transfected α-actinin-1 significantly increased TGF-β 1-induced plasminogen activator inhibitor-1 (PAI-1) promoter activity in human mesangial cells. These findings suggest that α-actinin-1 may play a role in human glomerular disease.
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