Journal
EXPERIMENTAL EYE RESEARCH
Volume 88, Issue 2, Pages 140-143Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.exer.2008.05.005
Keywords
lens epithelium; Na,K-ATPase; ion transport; tyrosine kinase; purinergic receptor
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Funding
- NEI NIH HHS [R01 EY009532, R01 EY009532-09] Funding Source: Medline
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In the late 1960s, studies by George Duncan explained many of the basic principles that underlie lens ion homeostasis. The experiments pointed to a permeability barrier close to the surface of the lens and illustrated the requirement for continuous Na,K-ATPase-mediated active sodium extrusion. Without active sodium extrusion, lens sodium and calcium content increases resulting in lens swelling and deterioration of transparency. Later, Duncan's laboratory discovered functional muscarinic and purinergic receptors at the surface of the lens. Recent studies using intact lens suggest purinergic receptors might be involved in short-term regulation of Na,K-ATPase in the epithelium. Purinergic receptor agonists ATP and UTP selectively activate certain Src family tyrosine kinases and stimulate Na,K-ATPase activity. This might represent part of a control mechanism capable of adjusting, perhaps fine tuning, lens ion transport machinery. (C) 2008 Elsevier Ltd. All rights reserved.
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