Journal
EXPERIMENTAL BIOLOGY AND MEDICINE
Volume 233, Issue 6, Pages 689-693Publisher
SOC EXPERIMENTAL BIOLOGY MEDICINE
DOI: 10.3181/0710-RM-279
Keywords
alpha-actinin-1; mesangial cells; transforming growth factor-beta 1; plasminogen activator inhibitor-1; glomerular disease
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Recent studies have demonstrated important roles of alpha-actinins in glomerular disease, while little information is known about the expression profile of alpha-actinins in human glomerular mesangial cells. Here, immunofluorescence and confocal microscopy showed that alpha-actinin-1 exclusively distributed along mesangial cells in human glomeruli of IgA nephropathy. RT-PCR and Western blot further confirmed the expression of a-actinin-1 in primary cultured human mesangial cells. We also found that transforming growth factor-beta 1 (TGF-beta 1) stimulated ACTN1 gene transcription and that transiently transfected alpha-actinin-1 significantly increased TGF-beta 1-induced plasminogen activator inhibitor-1 (PAI-1) promoter activity in human mesangial cells. These findings suggest that a-actinin-1 may play a role in human glomerular disease.
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