Loss of TIMP3 underlies diabetic nephropathy via FoxO1/STAT1 interplay.

EMBO Mol Med 2013 Mar 12;5(3):441-55. Epub 2013 Feb 12.

Department of Systems Medicine, University of Rome Tor Vergata, Rome, Italy.

ADAM17 and its inhibitor TIMP3 are involved in nephropathy, but their role in diabetic kidney disease (DKD) is unclear. Diabetic Timp3(-/-) mice showed increased albuminuria, increased membrane thickness and mesangial expansion. Microarray profiling uncovered a significant reduction of Foxo1 expression in diabetic Timp3(-/-) mice compared to WT, along with FoxO1 target genes involved in autophagy, while STAT1, a repressor of FoxO1 transcription, was increased. Re-expression of Timp3 in Timp3(-/-) mesangial cells rescued the expression of Foxo1 and its targets, and decreased STAT1 expression to control levels; abolishing STAT1 expression led to a rescue of FoxO1, evoking a role of STAT1 in linking Timp3 deficiency to FoxO1. Studies on kidney biopsies from patients with diabetic nephropathy confirmed a significant reduction in TIMP3, FoxO1 and FoxO1 target genes involved in autophagy compared to controls, while STAT1 expression was strongly increased. Our study suggests that loss of TIMP3 is a hallmark of DKD in human and mouse models and designates TIMP3 as a new possible therapeutic target for diabetic nephropathy.

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Source
http://dx.doi.org/10.1002/emmm.201201475DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3598083PMC
March 2013
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