Referenced in: none

Automatically associated channels: ClC4

Title: Loss of aquaporin-4 expression and putative function in non-small cell lung cancer.

Authors: Arne Warth, Thomas Muley, Michael Meister, Esther Herpel, Anita Pathil, Hans Hoffmann, Philipp A Schnabel, Christian Bender, Andreas Buness, Peter Schirmacher, Ruprecht Kuner

Journal, date & volume: BMC Cancer, 2011 , 11, 161

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/21548930

Abstract
Aquaporins (AQPs) have been recognized to promote tumor progression, invasion, and metastasis and are therefore recognized as promising targets for novel anti-cancer therapies. Potentially relevant AQPs in distinct cancer entities can be determined by a comprehensive expression analysis of the 13 human AQPs.We analyzed the presence of all AQP transcripts in 576 different normal lung and non-small cell lung cancer (NSCLC) samples using microarray data and validated our findings by qRT-PCR and immunohistochemistry.Variable expression of several AQPs (AQP1, -3, -4, and -5) was found in NSCLC and normal lung tissues. Furthermore, we identified remarkable differences between NSCLC subtypes in regard to AQP1, -3 and -4 expression. Higher transcript and protein levels of AQP4 in well-differentiated lung adenocarcinomas suggested an association with a more favourable prognosis. Beyond water transport, data mining of co-expressed genes indicated an involvement of AQP4 in cell-cell signalling, cellular movement and lipid metabolism, and underlined the association of AQP4 to important physiological functions in benign lung tissue.Our findings accentuate the need to identify functional differences and redundancies of active AQPs in normal and tumor cells in order to assess their value as promising drug targets.