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To investigate proteins expressed in the renal tissue of the passive Heymann nephritis (pHN) rat model,we prepared pHN rat models with anti-FxA1 serum and analyzed the proteins differentially expressed in the kidney tissue with label-free liquid chromatography-tandem mass spectrometry.We then analyzed in depth the endoplasmic reticulum stress (ERS)-related protein using an online bioinformatics platform.Forty-one differential proteins and their annotations were obtained.Gene Ontology (GO) function analysis showed that 16 proteins were involved in cellular metabolism and 22 were proteins related to catalytic activity,including protein folding or ATPase.Protein-GO networks indicated that VCP could interact with the ERS marker HSPa5,with both involved in a single pathway.On inhibition of podocyte VCP by RNAi under normal conditions,the HSPa5 expression level did not change,but when the cell was subjected to ERS by tunicamycin,HSPa5 expression significantly increased with RNAi of VCP when compared with the tunicamycin-treated group.Our results showed that ERS plays an important role in podocyte injury of membranous nephropathy and is mediated by an HSPa5-VCP signaling pathway,in which the most predominant proteins are those related to cellular metabolism and catalytic activity.

A proteome-wide screen identifies valosin-containing protein as an essential regulator of podocyte endoplasmic reticulum stress