Display Settings:

Format

Send to:

Choose Destination
Exp Neurol. 2009 Jul;218(1):137-44. doi: 10.1016/j.expneurol.2009.04.019. Epub 2009 May 3.

PAK kinase regulates Rac GTPase and is a potential target in human schwannomas.

Author information

  • 1Clinical Neurobiology, Peninsula College for Medicine and Dentistry, The John Bull Building, Tamar Science Park, Research Way, Plymouth PL6 8BU, UK.

Abstract

Merlin loss causes benign tumours of the nervous system, mainly schwannomas and meningiomas. Schwannomas show enhanced Rac1 and Cdc42 activity, the p21-activated kinase 2 (PAK2) activation and increased ruffling and cell adhesion. PAK regulates activation of merlin. PAK has been proposed as a potential therapeutic target in schwannomas. However where PAK stands in the Rac pathway is insufficiently characterised. We used a novel small-molecule PAK inhibitor, IPA-3, to investigate the role of PAK activation on Rac1/Cdc42 activity, cell spreading and adhesion in human primary schwannoma and Schwann cells. We show that IPA-3 blocks activation of PAK2 at Ser192/197 that antagonises PAK's interaction with Pix. Accordingly, Pix-mediated Rac1 activation is decreased in IPA-3 treated schwannoma cells, indicating that PAK acts upstream of Rac. We show that this Rac activation at the level of focal adhesions in schwannoma cells is essential for cell spreading and adhesion in Schwann and schwannoma cells.

PMID:
19409384
[PubMed - indexed for MEDLINE]
PMCID:
PMC2760977
Free PMC Article

Images from this publication.See all images (6)Free text

Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Icon for Elsevier Science Icon for PubMed Central
    Loading ...
    Write to the Help Desk