Document Detail

Enhanced cold and desiccation tolerance in diapausing adults of Culex pipiens, and a role for Hsp70 in response to cold shock but not as a component of the diapause program.
MedLine Citation:
PMID:  16892629     Owner:  NLM     Status:  MEDLINE    
Culex pipiens L. reared under diapause-inducing conditions (short daylength; 18 degrees C) were more cold tolerant and desiccation resistant than their nondiapausing counterparts (long daylength; 18 degrees C). Upon cold exposure (-5 degrees C), diapausing mosquitoes reared at 18 degrees C survived nearly twice as long as nondiapausing mosquitoes reared at 18 degrees C and 10 times longer than nondiapausing mosquitoes reared at 25 degrees C. Thus, rearing temperature provided partial protection against low temperature injury in nondiapausing mosquitoes, but maximum resistance to cold was attained by the diapause state. In this species, the supercooling point is not a good indicator of cold tolerance. Both diapausing and nondiapausing females had supercooling points of approximately -16 degrees C, but diapausing as well as nondiapausing females died at temperatures well above the supercooling point, suggesting that low temperature mortality was due to indirect chilling injury. Diapause also conferred greater resistance to desiccation (1.6-2-fold increase in survival) compared with the nondiapause state. The gene encoding a 70-kDa heat shock protein, hsp70, was not up-regulated (i.e., more highly expressed) as a part of the diapause program, nor was it up-regulated by desiccation stress, but it was up-regulated during recovery from cold shock. Cx. pipiens thus differs from a number of other diapausing insect species that are known to developmentally up-regulate hsp70 during diapause.
Joseph P Rinehart; Rebecca M Robich; David L Denlinger
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of medical entomology     Volume:  43     ISSN:  0022-2585     ISO Abbreviation:  J. Med. Entomol.     Publication Date:  2006 Jul 
Date Detail:
Created Date:  2006-08-08     Completed Date:  2006-09-07     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0375400     Medline TA:  J Med Entomol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  713-22     Citation Subset:  IM    
Department of Entomology, The Ohio State University, Columbus, OH 43210, USA.
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MeSH Terms
Amino Acid Sequence
Blotting, Northern / methods
Cloning, Molecular
Cold Temperature*
Culex / physiology*
Gene Expression Regulation / physiology*
HSP70 Heat-Shock Proteins / chemistry,  genetics,  physiology*
Molecular Sequence Data
Sequence Alignment
Survival Analysis
Time Factors
Grant Support
Reg. No./Substance:
0/HSP70 Heat-Shock Proteins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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