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Media type:
E-Article
Title:
Pan-Src kinase inhibitor treatment attenuates diabetic kidney injury via inhibition of Fyn kinase-mediated endoplasmic reticulum stress
Contributor:
Dorotea, Debra;
Jiang, Songling;
Pak, Eun Seon;
Son, Jung Beom;
Choi, Hwan Geun;
Ahn, Sung-Min;
Ha, Hunjoo
Published:
Springer Science and Business Media LLC, 2022
Published in:
Experimental & Molecular Medicine, 54 (2022) 8, Seite 1086-1097
Language:
English
DOI:
10.1038/s12276-022-00810-3
ISSN:
2092-6413
Origination:
Footnote:
Description:
<jats:title>Abstract</jats:title><jats:p>Src family kinases (SFKs) have been implicated in the pathogenesis of kidney fibrosis. However, the specific mechanism by which SFKs contribute to the progression of diabetic kidney disease (DKD) remains unclear. Our preliminary transcriptome analysis suggested that SFK expression was increased in diabetic kidneys and that the expression of Fyn (a member of the SFKs), along with genes related to unfolded protein responses from the endoplasmic reticulum (ER) stress signaling pathway, was upregulated in the tubules of human diabetic kidneys. Thus, we examined whether SFK-induced ER stress is associated with DKD progression. Mouse proximal tubular (mProx24) cells were transfected with <jats:italic>Fyn</jats:italic> or <jats:italic>Lyn</jats:italic> siRNA and exposed to high glucose and palmitate (HG-Pal). Streptozotocin-induced diabetic rats were treated with KF-1607, a novel pan-Src kinase inhibitor (SKI) with low toxicity. The effect of KF-1607 was compared to that of losartan, a standard treatment for patients with DKD. Among the SFK family members, the Fyn and Lyn kinases were upregulated under diabetic stress. HG-Pal induced p70S6 kinase and JNK/CHOP signaling and promoted tubular injury. <jats:italic>Fyn</jats:italic> knockdown but not <jats:italic>Lyn</jats:italic> knockdown inhibited this detrimental signaling pathway. In addition, diabetic rats treated with KF-1607 showed improved kidney function and decreased ER stress, inflammation, and fibrosis compared with those treated with losartan. Collectively, these findings indicate that Fyn kinase is a specific member of the SFKs implicated in ER stress activation leading to proximal tubular injury in the diabetic milieu and that pan-SKI treatment attenuates kidney injury in diabetic rats. These data highlight Fyn kinase as a viable target for the development of therapeutic agents for DKD.</jats:p>