RRC ID 56932
Author Shibata Y, Sano T, Tsuchiya N, Okada R, Mochida H, Tanaka S, Suzuki M.
Title Gene expression and localization of two types of AQP5 in Xenopus tropicalis under hydration and dehydration.
Journal Am J Physiol Regul Integr Comp Physiol
Abstract Two types of aquaporin 5 (AQP5) genes (aqp-xt5a and aqp-xt5b) were identified in the genome of Xenopus tropicalis by synteny comparison and molecular phylogenetic analysis. When the frogs were in water, AQP-xt5a mRNA was expressed in the skin and urinary bladder. The expression of AQP-xt5a mRNA was significantly increased in dehydrated frogs. AQP-xt5b mRNA was also detected in the skin and increased in response to dehydration. Additionally, AQP-xt5b mRNA began to be slightly expressed in the lung and stomach after dehydration. For the pelvic skin of hydrated frogs, immunofluorescence staining localized AQP-xt5a and AQP-xt5b to the cytoplasm of secretory cells of the granular glands and the apical plasma membrane of secretory cells of the small granular glands, respectively. After dehydration, the locations of both AQPs in their respective glands did not change, but AQP-xt5a was visualized in the cytoplasm of secretory cells of the small granular glands. For the urinary bladder, AQP-xt5a was observed in the apical plasma membrane and cytoplasm of a number of granular cells under normal hydration. After dehydration, AQP-xt5a was found in the apical membrane and cytoplasm of most granular cells. Injection of vasotocin into hydrated frogs did not induce these changes in the localization of AQP-xt5a in the small granular glands and urinary bladder, however. The results suggest that AQP-xt5a might be involved in water reabsorption from the urinary bladder during dehydration, whereas AQP-xt5b might play a role in water secretion from the small granular gland.
Volume 307(1)
Pages R44-56
Published 2014-7-1
DOI 10.1152/ajpregu.00186.2013
PII ajpregu.00186.2013
PMID 24717674
MeSH Amino Acid Sequence Animals Aquaporin 5 / genetics Aquaporin 5 / metabolism* Cloning, Molecular Dehydration / genetics Dehydration / metabolism* Dehydration / physiopathology Gene Expression Regulation Immunohistochemistry Molecular Sequence Data Osmoregulation Phylogeny Protein Isoforms RNA, Messenger / metabolism Skin / metabolism Synteny Urinary Bladder / metabolism Water / metabolism* Water-Electrolyte Balance* Xenopus / genetics Xenopus / metabolism* Xenopus Proteins / genetics Xenopus Proteins / metabolism*
IF 3.176
Times Cited 5
Clawed frogs / Newts