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Expression of the AQP-1 water channel in normal human tissues: a semiquantitative study using tissue microarray technology.

Mobasheri, A and Marples, D (2004) Expression of the AQP-1 water channel in normal human tissues: a semiquantitative study using tissue microarray technology. Am J Physiol Cell Physiol, 286 (3). C529-C537.

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Aquaporin water channels are a family of membrane proteins that facilitate water movement across biological membranes. Aquaporin-1 (AQP-1) has been found to be important in osmotic water movement across cell membranes of epithelial and endothelial barriers. However, the distribution of AQP-1 in many normal human tissues is still unknown. The aim of this study was to use immunohistochemistry and semiquantitative histomorphometric analysis to determine the tissue distribution and relative expression of AQP-1 in normal human tissues using tissue microarray (TMA) technology. The normal human TMAs employed in this study included cardiovascular, respiratory, gastrointestinal, hepatic and pancreatobiliary, oral, salivary, nasal, mammary, fetal, endocrine, genital tract, central and peripheral nervous systems, urinary tract, skin, cartilage, and other soft connective tissues. Immunohistochemistry and semiquantitative histomorphometric analysis confirmed the presence of AQP-1 in endothelial barriers of almost all tissues and in many epithelial barriers. AQP-1 was highly expressed in the renal cortex, choroid plexus, and pancreatic ducts. AQP-1 expression levels were surprisingly high in the anus, gallbladder, and liver; moderate expression was also detected in the hippocampus and ependymal cells of the central nervous system. This is the first report of AQP-1 protein distribution in normal human TMAs. These findings confirm the presence of AQP-1 in human endothelia and selected water-transporting epithelia and several new locations, including mammary epithelium, articular chondrocytes, synoviocytes, and synovial microvessels where AQP-1 may be involved in milk production, chondrocyte volume regulation, synovial fluid secretion, and homeostasis, respectively.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Marples, D
Date : March 2004
DOI : 10.1152/ajpcell.00408.2003
Uncontrolled Keywords : Aquaporin 1, Aquaporins, Blood Group Antigens, Chondrocytes, Epithelial Cells, Humans, Oligonucleotide Array Sequence Analysis, Synovial Membrane, Water
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 10:16
Last Modified : 24 Jan 2020 18:53

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