AGE/RAGE as a Mediator of Insulin Resistance or Metabolic Syndrome: Another Aspect of Metabolic Memory?

Koyama, Hidenori; Yamamoto, Tetsuya

doi:10.5772/20468

Cited by 1 publication

(1 citation statement)

References 169 publications

(141 reference statements)

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“…We found that both HG and S100B increased Steap4 protein expression while HG‐induced Steap4 was dependent on S100B. This finding is similar to two previous studies showing that Steap4 is increased in HG‐cultured macrophages and decreased in RAGE‐knockout mouse adipocytes . The finding that Steap4 overexpression attenuated HG‐induced effects suggest that HG‐induced Steap4 expression may be a compensatory mechanism.…”

Section: Discussionsupporting

confidence: 90%

Steap4 attenuates high glucose and S100B‐induced effects in mesangial cells

Chuang

Guh

et al. 2015

J Cellular Molecular Medi

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Six-transmembrane epithelial antigen of prostate 4 (Steap4)-knockout mice develop hyperglycaemia and inflammation whereas Steap4 overexpression attenuates atherosclerosis in diabetic mice. Thus, we studied the roles of Steap4 in high glucose (HG, 27.5 mM) or S100B (1 μM, a ligand for the receptor for advanced glycation end-product or RAGE)-induced effects in mouse mesangial (MES13) cells. We found that HG-induced Steap4 protein expression was dependent on S100B. HG increased cell membrane, but not cytosolic, Steap4 protein expression. HG increased protein-protein interaction between Steap4 and S100B, which was confirmed by mass spectrometry of immunoprecipitated S100B. SP600125, LY294002 and AG490 attenuated S100B-induced Steap4 protein expression or gene transcriptional activity. A mutation in signal transducer and activator of transcription 3 (Stat3) site 2 of the Steap4 promoter constructs resulted in a marked decrease in HG or S100B-induced activation of Steap4 gene transcription. Overexpression of Steap4 attenuates HG or S100B-induced collagen IV, fibronectin and cyclooxygenase 2 protein expression. Overexpression of Steap4 attenuates HG or S100B-induced transforming growth factor-β (TGF-β). Moreover, overexpression of Steap4 attenuates S100B-induced signalling. Finally, overexpressing Steap4 attenuated renal expression of fibronectin, S100B, TGF-β, type IV collagen, p-Akt, p-extracellular signal regulated kinase 1/2 and p-Stat3 in streptozotocin-diabetic mice. Thus, overexpression of Steap4 attenuated HG or S100B-induced effects in MES13 cells and attenuated some of S100B-induced effects in diabetic mouse kidneys.

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Section: Discussionsupporting

confidence: 90%