Global Advanced Research Journal of Medicine and Medical Sciences (GARJMMS) ISSN: 2315-5159
October 2014 Vol. 3(10), pp. 347-353
Copyright © 2014 Global Advanced Research Journals
Full Length Research Paper
Decreased β1 Na+ - K+ ATPase subunit expression and defective focal adhesion kinase activation mediate disturbed cell polarity in autosomal recessive polycystic kidney disease
Mohamed S. A. Mohamed
Department of Pediatrics Nephrology, MHH, Carl-Neuberg-Strae 1, D-30625 Hannover, Germany.
Accepted 01 October, 2014
ARPKD is a developmental disease that results from fibrocystin loss of function mutation. It affects mainly renal collecting ducts and biliary system. The exact mechanism of how fibrocystin mutation results in the disease manifestations is not known as the exact functions of fibrocystin are also not known. However, this hypothesis explains one of the major mechanisms that may be involved in ARPKD development based on a group of proved observations in previous publications. The impaired epithelial cellular polarity seen in ARPKD might result from impaired β1 / β2 Na+- K+ ATPase expression together with impaired FAK activation and functions, with possible involvement of adhesion signaling in development of those interactions. Expression of β1 Na+- K+ ATPase subunit is necessary for E- cadherin mediated establishment of epithelial cell polarity. Focal adhesion kinase interacts with adhesion proteins and is essential for establishment of polarized cell migration. Both together may explain how fibrocystin loss of function mutation can result in reversed epithelial cell polarity which proceeds to intracystic secretion in ARPKD.
Keywords: ARPKD, Fibrocystin, FAK, Na+ - K+ ATPase, and epithelial cell polarity.