Inactivation of JAK2/STAT3 signaling axis and downregulation of m1 mAChR cause cognitive impairment in klotho mutant mice, a genetic model of aging

Seok Joo Park, Eun Joo Shin, Sun Seek Min, Jihua An, Zhengyi Li, Yoon Hee Chung, Ji Hoon Jeong, Jae Hyung Bach, Seung Yeol Nah, Won Ki Kim, Choon Gon Jang, Yong Sun Kim, Yo Ichi Nabeshima, Toshitaka Nabeshima, Hyoung Chun Kim

研究成果: Article査読

50 被引用数 (Scopus)

抄録

We previously reported cognitive dysfunction in klotho mutant mice. In the present study, we further examined novel mechanisms involved in cognitive impairment in these mice. Significantly decreased janus kinase 2 (JAK2) and signal transducer and activator of transcription3 (STAT3) phosphorylation were observed in the hippocampus of klotho mutant mice. A selective decrease in protein expression and binding density of the M1 muscarinic cholinergic receptor (M1 mAChR) was observed in these mice. Cholinergic parameters (ie, acetylcholine (ACh), choline acetyltransferase (ChAT), and acetylcholinesterase (AChE)) and NMDAR-dependent long-term potentiation (LTP) were significantly impaired in klotho mutant mice. McN-A-343 (McN), an M1 mAChR agonist, significantly attenuated these impairments. AG490 (AG), a JAK2 inhibitor, counteracted the attenuating effects of McN, although AG did not significantly alter the McN-induced effect on AChE. Furthermore, AG significantly inhibited the attenuating effects of McN on decreased NMDAR-dependent LTP, protein kinase C βII, p-ERK, p-CREB, BDNF, and p-JAK2/p-STAT3-expression in klotho mutant mice. In addition, k252a, a BDNF receptor tyrosine kinase B (TrkB) inhibitor, significantly counteracted McN effects on decreased ChAT, ACh, and M1 mAChR and p-JAK2/p-STAT3 expression. McN-induced effects on cognitive impairment in klotho mutant mice were consistently counteracted by either AG or k252a. Our results suggest that inactivation of the JAK2/STAT3 signaling axis and M1 mAChR downregulation play a critical role in cognitive impairment observed in klotho mutant mice.

本文言語English
ページ(範囲)1426-1437
ページ数12
ジャーナルNeuropsychopharmacology
38
8
DOI
出版ステータスPublished - 07-2013
外部発表はい

All Science Journal Classification (ASJC) codes

  • 薬理学
  • 精神医学および精神衛生

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