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GSK3ß modulates PACAP-induced neuritogenesis in PC12 cells by acting downstream of Rap1 in a caveolae-dependent manner

journal contribution
posted on 2023-05-17, 00:36 authored by Zhang, W, Smith, A, Liu, J, Cheung, NS, Zhou, S, Liu, K, Li, QT, Duan, W
Pituitary adenylate cyclase-activating polypeptide (PACAP) is a neurotrophic peptide. Here, we show that PACAP recruits Rap1 into caveolin-enriched membrane subdomains in PC12 cells and activates Rap1, nuclear ERK1/2, Elk-1 and CREB in a caveolae-dependent manner. We reveal that GSK3ß is a novel modulator in PACAP signalling. PACAP induces phosphorylation of serine 9 in GSK3ß, which is inhibited by silencing Rap1. Lithium and valproate promote but wortmannin and LY294002 attenuate PACAP-induced phosphorylation of both GSK3ß and ERK1/2, whereas MEK inhibitor PD98059 inhibits nerve growth factor- but not PACAPinduced phosphorylation of GSK3ß, suggesting that GSK3ß operates downstream of Rapt 1 but upstream of ERK1/2 in PACAP signalling. Inhibition or stimulation of GSK3ß results in a 2-fold increase and 6-fold decrease in PACAP-induced neurite outgrowth, respectively. These results reveal an important role of caveolae in the signal transduction of PACAP and that GSK3ß is a critical regulator in PACAP-induced neuronal differentiation.

History

Publication title

Cellular Signalling

Volume

21

Pagination

237-245

ISSN

0898-6568

Department/School

Menzies Institute for Medical Research

Publisher

Elsevier Science Inc

Place of publication

360 Park Ave South, New York, USA, Ny, 10010-1710

Repository Status

  • Restricted

Socio-economic Objectives

Clinical health not elsewhere classified

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