| 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. | |
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MedLine Citation:
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PMID: 16892629 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Joseph P Rinehart; Rebecca M Robich; David L Denlinger |
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Publication Detail:
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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:
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Title: Journal of medical entomology Volume: 43 ISSN: 0022-2585 ISO Abbreviation: J. Med. Entomol. Publication Date: 2006 Jul |
Date Detail:
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Created Date: 2006-08-08 Completed Date: 2006-09-07 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0375400 Medline TA: J Med Entomol Country: United States |
Other Details:
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Languages: eng Pagination: 713-22 Citation Subset: IM |
Affiliation:
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Department of Entomology, The Ohio State University, Columbus, OH 43210, USA. |
| Data Bank Information | |
Bank Name/Acc. No.:
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GENBANK/AY974355 |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Amino Acid Sequence Animals Blotting, Northern / methods Cloning, Molecular Cold Temperature* Culex / physiology* Desiccation* Female Gene Expression Regulation / physiology* HSP70 Heat-Shock Proteins / chemistry, genetics, physiology* Molecular Sequence Data Sequence Alignment Survival Analysis Time Factors Up-Regulation |
| Grant Support | |
ID/Acronym/Agency:
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R01 AI058279/AI/NIAID NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/HSP70 Heat-Shock Proteins |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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