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Updated: Apr 14, 2026

Mechanism of Kemeng Fang's Inhibition of Podocyte Apoptosis in Rats with Membranous Nephropathy through the PI3K/AKT Signaling Pathway
Published on: August 23, 2024
Expression of nephronectin is inhibited by oncostatin M via both JAK/STAT and MAPK pathways
Tamaki Kurosawa1, Atsushi Yamada2, Masamichi Takami3
1Department of Biochemistry, School of Dentistry, Showa University, Shinagawa, Tokyo 142-8555, Japan ; Division of Biological Chemistry, Department of Molecular Biology, Showa University School of Pharmacy, Shinagawa, Tokyo 142-8555, Japan.
Abstract:
Nephronectin (Npnt), also called POEM, is an extracellular matrix protein considered to play critical roles as an adhesion molecule in the development and functions of various tissues, such as the kidneys, liver, and bones. In the present study, we examined the molecular mechanism of Npnt gene expression and found that oncostatin M (OSM) strongly inhibited Npnt mRNA expression in MC3T3-E1 cells from a mouse osteoblastic cell line. OSM also induced a decrease in Npnt expression in both time- and dose-dependent manners via both the JAK/STAT and MAPK pathways. In addition, OSM-induced inhibition of osteoblast differentiation was recovered by over-expression of Npnt. These results suggest that OSM inhibits Npnt expression via the JAK/STAT and MAPK pathways, while down-regulation of Npnt by OSM influences inhibition of osteoblast differentiation.
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