Aquaporins in complex tissues. I. Developmental patterns in respiratory and glandular tissues of rat

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Title: Aquaporins in complex tissues. I. Developmental patterns in respiratory and glandular tissues of rat
Author: Agre, Peter; Nielsen, Søren; King, Landon S.
Abstract: Developmental expression of aquaporin water transport proteins is not well understood in respiratory tract or secretory glands; here we define aquaporin protein ontogeny in rat. Expression of aquaporin-3 (AQP3), AQP4, and AQP5 proteins occurs within 2 wk after birth, whereas AQP1 first appears before birth. In most tissues, aquaporin protein expression increases progressively, although transient high-level expression is noted in distal lung (AQP4 at postnatal day +2) and trachea (AQP5 at postnatal day +21 and AQP3 at postnatal day +42). In mature animals, AQP5 is abundant in distal lung and salivary glands, AQP3 and AQP4 are present in trachea, and AQP1 is present in all of these tissues except salivary glands. Surprisingly, all four aquaporin proteins are highly abundant in nasopharynx. Unlike AQP1, corticosteroids did not induce expression of AQP3, AQP4, or AQP5 in lung. Our results seemingly implicate aquaporins in proximal airway humidification, glandular secretion, and perinatal clearance of fluid from distal airways. However, the studies underscore a need for detailed immunohistochemical characterizations and definitive functional studies.
URI: http://jhir.library.jhu.edu/handle/1774.2/34115
Date: 1997-11
Citation: American Journal of Physiology, 1997 Nov;273(5 Pt 1):C1541-8. http://ajpcell.physiology.org/cgi/content/full/273/5/C1541
Subject: Salivary Glands/physiology
Respitory Physiological Phenomena
Membrane Proteins
Lung/physiology
Ion Channels/biosynthesis
Aquaporins
Aging/metabolism

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