Identification and characterization of an insulin receptor substrate 4-interacting protein in rat brain: Implications for longevity

Takuya Chiba*, Daisuke Inoue, Aya Mizuno, Toshimitsu Komatsu, Satoshi Fujita, Haruaki Kubota, Maria Luisa Tagliaro, Seongjoon Park, Lucas Siqueira Trindade, Takahiro Hayashida, Hiroko Hayashi, Haruyoshi Yamaza, Yoshikazu Higami, Isao Shimokawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


The hypothalamus is organized as a collection of distinct, autonomously active nuclei that regulate discrete functions, such as feeding activity and metabolism. We used suppression subtractive hybridization (SSH) to identify genes that are enriched in the hypothalamus of the rat brain. We screened a subtractive library of 160 clones, and 4 genes that were predominantly expressed in the hypothalamus, compared to other brain regions. The mRNA for a member of the WD-repeat family of proteins, WDR6, was abundantly expressed in the hypothalamus, and we found that WDR6 interacted with insulin receptor substrate 4 (IRS-4) in the rat brain. Interestingly, WDR6 gene expression in the hypothalamic arcuate nucleus was decreased by caloric restriction, and in growth hormone (GH)-antisense transgenic rats, both of which are associated with an increased life span. Insulin-like growth factor (IGF)-I and insulin treatment increased WDR6 gene expression in mouse hypothalamus-derived GT1-7 cells. Our results might suggest that WDR6 participates in insulin/IGF-I signaling and the regulation of feeding behavior and longevity in the brain.

Original languageEnglish
Pages (from-to)474-482
Number of pages9
JournalNeurobiology of Aging
Issue number3
Publication statusPublished - 2009 Mar
Externally publishedYes


  • Calorie restriction
  • Insulin/IGF-I signal
  • SSH
  • WD-repeat protein

ASJC Scopus subject areas

  • Neuroscience(all)
  • Ageing
  • Developmental Biology
  • Clinical Neurology
  • Geriatrics and Gerontology


Dive into the research topics of 'Identification and characterization of an insulin receptor substrate 4-interacting protein in rat brain: Implications for longevity'. Together they form a unique fingerprint.

Cite this