Am J Physiol Cell Physiol AJP: Regulatory, Integrative and Comparative Physiology
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Am J Physiol Cell Physiol 283: C261-C272, 2002; doi:10.1152/ajpcell.00604.2001
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Vol. 283, Issue 1, C261-C272, July 2002

Rac1, but not RhoA, signaling protects epithelial adherens junction assembly during ATP depletion

Shobha Gopalakrishnan, Kenneth W. Dunn, and James A. Marrs

Department of Medicine, Indiana University Medical Center, Indianapolis, Indiana 46202-5116

Rho family GTPase signaling regulates actin cytoskeleton and junctional complex assembly. Our previous work showed that RhoA signaling protects tight junctions from damage during ATP depletion. Here, we examined whether RhoA GTPase signaling protects adherens junction assembly during ATP depletion. Despite specific RhoA signaling- and ATP depletion-induced effects on adherens junction assembly, RhoA signaling did not alter adherens junction disassembly rates during ATP depletion. This shows that RhoA signaling specifically protects tight junctions from damage during ATP depletion. Rac1 GTPase signaling also regulates adherens junction assembly and therefore may regulate adherens junction assembly during ATP depletion. Indeed, we found that Rac1 signaling protects adherens junctions from damage during ATP depletion. Adherens junctions are regulated by various GTPases, including RhoA and Rac1, but adherens junctions are specifically protected by Rac1 signaling.

ischemia; cadherin; catenin


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