Papers

Peer-reviewed
Apr, 2012

Candesartan Cilexetil Improves Angiotensin II Type 2 Receptor-Mediated Neurite Outgrowth via the PI3K-Akt Pathway in Fructose-Induced Insulin-Resistant Rats

DIABETES
  • Narumi Hashikawa-Hobara
  • ,
  • Naoya Hashikawa
  • ,
  • Yusuke Inoue
  • ,
  • Hitomi Sanda
  • ,
  • Yoshito Zamami
  • ,
  • Shingo Takatori
  • ,
  • Hiromu Kawasaki

Volume
61
Number
4
First page
925
Last page
932
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.2337/db11-1468
Publisher
AMER DIABETES ASSOC

We have shown previously that stimulation of the angiotensin type 2 receptor (AT(2)R) results in nerve facilitation. In this study, we determined the capacity of candesartan to correct expression patterns characteristic of neuropathy and AT(2)R-mediated neurite outgrowth in the fructose-induced insulin-resistant rat, which is one of the human hyperinsulinemia models. Wistar rats received a 15% (w/v) fructose solution in their drinking water for 4 weeks (fructose-drinking rats [FDRs]), with or without candesartan (5 mg/kg/day). We evaluated physiological and behavioral parameters and performed immunohistochemical studies. We found that the FDR developed insulin resistance and downregulated both AT(2)R neuronal function and phosphorylated Akt expression in dorsal root ganglia (DRG) neurons. Candesartan improved neurite outgrowth in the FDR, which was associated with the restoration of AT(2)R and phosphorylated Akt expression. Furthermore, downregulation of phosphoinositide 3-kinase (PI3K) inhibited AT(2)R-mediated neurite outgrowth in control DRG cells. PI3K activation increased AT(2)R-mediated neurite outgrowth and phosphorylated Akt expression in FDR DRG cells. These results suggest that the decrease of AT(2)R-mediated neurite outgrowth in FDRs is likely to be the result of decreased PI3K-dependent Akt activation. Candesartan improved AT(2)R neuronal function and Akt phosphorylation, which were associated with sensory nerve defects and insulin sensitivity in the FDR. Diabetes 61:925 932, 2012

Link information
DOI
https://doi.org/10.2337/db11-1468
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/22357959
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000301959800021&DestApp=WOS_CPL
ID information
  • DOI : 10.2337/db11-1468
  • ISSN : 0012-1797
  • Pubmed ID : 22357959
  • Web of Science ID : WOS:000301959800021

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