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Regulation of aquaporin water channe...

Lodewyck, Danielle Nicoletta.

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Regulation of aquaporin water channels in vocal fold epithelium.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Regulation of aquaporin water channels in vocal fold epithelium./
Author:	Lodewyck, Danielle Nicoletta.
Description:	111 p.
Notes:	Adviser: Kimberly V. Fisher.
Contained By:	Dissertation Abstracts International67-03B.
Subject:	Biology, Cell. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3213056
ISBN:	9780542624681

Regulation of aquaporin water channels in vocal fold epithelium.
Lodewyck, Danielle Nicoletta.

Regulation of aquaporin water channels in vocal fold epithelium. - 111 p.

Adviser: Kimberly V. Fisher.

Thesis (Ph.D.)--Northwestern University, 2006.

Vocal fold hydration is of critical importance to the initiation and maintenance of sustained phonation, although the mechanisms of ion and water transport in this system are only recently being investigated. Aquaporin water channels, present in the plasma membrane of epithelial cells, allow the passive osmotic passage of water across the cell membrane. The aim of these studies was to identify the presence and regulation of aquaporins in vocal fold epithelial cells.

ISBN: 9780542624681Subjects--Topical Terms:

1017686
Biology, Cell.

Regulation of aquaporin water channels in vocal fold epithelium.
LDR:03228nam 2200301 a 45 001 969526
005 20110920
008 110921s2006 eng d
020 $a 9780542624681
035 $a (UnM)AAI3213056
035 $a AAI3213056
040 $a UnM $c UnM
100 1 $a Lodewyck, Danielle Nicoletta. $3 1293581
245 1 0 $a Regulation of aquaporin water channels in vocal fold epithelium.
300 $a 111 p.
500 $a Adviser: Kimberly V. Fisher.
500 $a Source: Dissertation Abstracts International, Volume: 67-03, Section: B, page: 1410.
502 $a Thesis (Ph.D.)--Northwestern University, 2006.
520 $a Vocal fold hydration is of critical importance to the initiation and maintenance of sustained phonation, although the mechanisms of ion and water transport in this system are only recently being investigated. Aquaporin water channels, present in the plasma membrane of epithelial cells, allow the passive osmotic passage of water across the cell membrane. The aim of these studies was to identify the presence and regulation of aquaporins in vocal fold epithelial cells.
520 $a Freshly excised ovine larynges were obtained from the abbatoir and exposed to either 10nM vasopressin or sham control for short-term (40 minutes) or long-term (4 hours) regulation studies. Long-term regulation of aquaporins by vasopressin was investigated using real-time RT-PCR of AQP1 (N=34) and AQP2 (N=32) mRNA of ovine vocal folds. Long-term vasopressin-treated vocal fold samples contained significantly higher levels of AQP1, but not AQP2, as compared to sham controls. Short-term regulation of aquaporins by vasopressin was investigated using immunolocalization of AQP1 and AQP2 proteins in ovine vocal folds exposed to either vasopressin (10nM, N=8) or sham control (N=8) for 40 minutes. Immunolocalization of sham controls revealed labeling of AQP1, and to a lesser extent, AQP2, in the plasma membrane and circular bodies in the cytoplasm of luminal cells. Immunolabeling densities of the plasma membrane and cytoplasm were not significantly different between vasopressin-treated and sham control samples for either AQP1 or AQP2. Light microscopy of thick sections revealed an increased cell size of vasopressin-treated samples as compared to sham controls, as well as rough luminal edges in some samples.
520 $a The pattern of labeling seen in control samples is consistent with a specialization of luminal cells for rapid fluxes of water in response to osmotic challenges at the lumen of the airway. The vasopressin-dependent increase of AQP1 mRNA in stratified squamous epithelium of the vocal fold suggests a hormonal mechanism for long-term upregulation of water permeability in luminal cells. Increases in cell volume of vocal fold epithelial cells following short-term vasopressin exposure suggested an effect of vasopressin on water permeability in these cells, although no increase in immunolabeling of aquaporins was visible in samples.
590 $a School code: 0163.
650 4 $a Biology, Cell. $3 1017686
650 4 $a Health Sciences, Speech Pathology. $3 1018105
690 $a 0379
690 $a 0460
710 2 0 $a Northwestern University. $3 1018161
773 0 $t Dissertation Abstracts International $g 67-03B.
790 $a 0163
790 1 0 $a Fisher, Kimberly V., $e advisor
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3213056