Kidney proximal tubular epithelial-specific overexpression of netrin-1 suppresses inflammation and albuminuria through suppression of COX-2-mediated PGE2 production in streptozotocin-induced diabetic mice

Riyaz Mohamed, Calpurnia Jayakumar, Punithavathi V. Ranganathan, Vadivel Ganapathy, Ganesan Ramesh

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Abstract

Inflammation plays a key role in the development and progression of diabetic kidney disease; however, the role of the anti-inflammatory molecule netrin-1 in diabetic kidney disease is unknown. We examined the role of netrin-1 in diabetes-induced kidney inflammation and injury using tubule-specific netrin-1 transgenic mice. Diabetes was induced using streptozotocin in wild-type and netrin-1 transgenic animals. Kidney function, fibrosis, glucose excretion, albuminuria, and inflammation were evaluated. The mechanism of netrin-1-induced suppression of inflammation was studied in vitro using a proximal tubular epithelial cell line. Diabetes was associated with increased infiltration of neutrophils and macrophages, chemokine expression, and tubular epithelial cell apoptosis in kidney. These changes were minimal in kidney of netrin-1 transgenic mice. In addition, diabetes induced a large increase in the excretion of prostaglandin E2 (PGE2) in urine, which was suppressed in netrin-1 transgenic mice. Netrin-1-induced suppression of PGE2 production was mediated through suppression of NFκB-mediated cyclooxygenase-2 (COX-2) in renal tubular epithelial cells. Furthermore, netrin-1 also increased albumin uptake by proximal tubular epithelial cells through the PI3K and ERK pathways without increasing glucose uptake. These findings suggest that netrin-1 is a major regulator of inflammation and apoptosis in diabetic nephropathy and may be a useful therapeutic molecule for treating chronic kidney diseases such as diabetic nephropathy.

Original languageEnglish (US)
Pages (from-to)1991-2002
Number of pages12
JournalAmerican Journal of Pathology
Volume181
Issue number6
DOIs
StatePublished - Dec 1 2012

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Albuminuria
Cyclooxygenase 2
Streptozocin
Dinoprostone
Inflammation
Kidney
Diabetic Nephropathies
Epithelial Cells
Transgenic Mice
netrin-1
Apoptosis
Glucose
Genetically Modified Animals
Neutrophil Infiltration
MAP Kinase Signaling System
Phosphatidylinositol 3-Kinases
Chronic Renal Insufficiency
Chemokines
Albumins
Fibrosis

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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Kidney proximal tubular epithelial-specific overexpression of netrin-1 suppresses inflammation and albuminuria through suppression of COX-2-mediated PGE2 production in streptozotocin-induced diabetic mice. / Mohamed, Riyaz; Jayakumar, Calpurnia; Ranganathan, Punithavathi V.; Ganapathy, Vadivel; Ramesh, Ganesan.

In: American Journal of Pathology, Vol. 181, No. 6, 01.12.2012, p. 1991-2002.

Research output: Contribution to journalArticle

Mohamed, Riyaz ; Jayakumar, Calpurnia ; Ranganathan, Punithavathi V. ; Ganapathy, Vadivel ; Ramesh, Ganesan. / Kidney proximal tubular epithelial-specific overexpression of netrin-1 suppresses inflammation and albuminuria through suppression of COX-2-mediated PGE2 production in streptozotocin-induced diabetic mice. In: American Journal of Pathology. 2012 ; Vol. 181, No. 6. pp. 1991-2002.
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