RhoA deficiency disrupts podocyte cytoskeleton and induces podocyte apoptosis by inhibiting YAP/dendrin signal.

Abstract:

BACKGROUND:Podocyte apoptosis is a major mechanism that leads to proteinuria in many kidney diseases. However, the concert mechanisms that cause podocyte apoptosis in these kidney diseases are not fully understood. RhoA is one of Rho GTPases that has been well studied and plays a key role in regulating cytoskeletal architecture. Previous study showed that insufficient RhoA could result in rat aortic smooth muscle cell apoptosis. However, whether RhoA is involved in podocyte apoptosis remains unknown. METHODS:Culture podocytes were treated with LPS, ADR or siRNA for 48 h before harvest. Subcellular immunoblotting, qRT-PCR, immunofluorescence and flow cytometry were used to exam the expression and function of RhoA or YAP in podocytes. RESULTS:We found that the expression of RhoA and its activity were significantly decreased in LPS or ADR-injured podocytes, accompanying loss of stress fibers and increased cell apoptosis. Knocking down RhoA or its downstream effector mDia expression by siRNA also caused loss of stress fibers and podocyte apoptosis. Moreover, our results further demonstrated that RhoA deficiency could reduce the mRNA and protein expression of YAP, which had been regarded as an anti-apoptosis protein in podocyte. Silenced dendrin expression significantly abolished RhoA, mDia or YAP deficiency-induced podocyte apoptosis. CONCLUSION:RhoA deficiency could disrupt podocyte cytoskeleton and induce podocyte apoptosis by inhibiting YAP/dendrin signal. RhoA/mDia/YAP/dendrin signal pathway may potentially play an important role in regulating podocyte apoptosis. Maintaining necessary RhoA would be one potent way to prevent proteinuria kidney diseases.

journal_name

BMC Nephrol

journal_title

BMC nephrology

authors

Huang Z,Zhang L,Chen Y,Zhang H,Yu C,Zhou F,Zhang Z,Jiang L,Li R,Ma J,Li Z,Lai Y,Lin T,Zhao X,Zhang Q,Zhang B,Ye Z,Liu S,Wang W,Liang X,Liao R,Shi W

doi

10.1186/s12882-016-0287-6

subject

Has Abstract

pub_date

2016-07-07 00:00:00

pages

66

issue

1

issn

1471-2369

pii

10.1186/s12882-016-0287-6

journal_volume

17

pub_type

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