Document Detail


Hyperosmotic volume regulation in the gills of the ribbed mussel, Geukensia demissa: rapid accumulation of betaine and alanine.
MedLine Citation:
PMID:  11358578     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The content of betaine and alanine in gills of the ribbed mussel Geukensia demissa increases rapidly following transfer of the tissues from 250 to 1000 mOsm seawater (SW). Increases in alanine, proline and glycine account for most of the increase in the amino acid pool. The betaine content increases from 45 to 150 &mgr;mol/g dry weight within 12 h. Transfer of isolated gills from 250 to 1000 mOsm SW results in a temporary cessation of all ciliary activity. Within 20-40 min following transfer, ciliary activity has recovered. Recovery of ciliary activity precedes recovery of tissue hydration. The uric acid content of gills is unchanged by exposure to hyperosmotic media, suggesting that uric acid is not a store of nitrogen for alanine synthesis from pyruvate. In other organisms, the accumulation of betaine in response to hyperosmotic stress is a slow (days to weeks) process that probably involves changes in gene expression. The rapid, large increases in betaine reported here suggest that gene expression is not a factor in volume recovery by euryhaline bivalve tissues exposed to acute hyperosmotic stress.
Authors:
L E. Deaton
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Journal of experimental marine biology and ecology     Volume:  260     ISSN:  -     ISO Abbreviation:  J. Exp. Mar. Biol. Ecol.     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2001-May-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9879543     Medline TA:  J Exp Mar Bio Ecol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  185-197     Citation Subset:  -    
Affiliation:
Biology Department, University of Louisiana at Lafayette, 70504, Lafayette, LA, USA
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