| Allocation of nutrients to somatic tissues in young ovariectomized grasshoppers. | |
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MedLine Citation:
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PMID: 21558244 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The disposable soma hypothesis predicts that when reproduction is reduced, life span is increased because more nutrients are invested in the soma, increasing somatic repair. Rigorously testing the hypothesis requires tracking nutrients from ingestion to allocation to the soma or to reproduction. Fruit flies on life-extending dietary restriction increase allocation to the soma "relative" to reproduction, suggesting that allocation of nutrients can be associated with extension of life span. Here, we use stable isotopes to track ingested nutrients in ovariectomized grasshoppers during the first oviposition cycle. Previous work has shown that ovariectomy extends life span, but investment of protein in reproduction is not reduced until after the first clutch of eggs is laid. Because ovariectomy does not affect investment in reproduction at this age, the disposable soma hypothesis would predict that ovariectomy should also not affect investment in somatic tissues. We developed grasshopper diets with distinct signatures of ¹³C and ¹⁵N, but that produced equivalent reproductive outputs. These diets are, therefore, appropriate for the reciprocal switches in diet needed for tracking ingested nutrients. Incorporation of stable isotopes into eggs showed that grasshoppers are income breeders, especially for carbon. Allocation to the fat body of nitrogen ingested as adults was slightly increased by ovariectomy; this was our only result that was not consistent with the disposable soma hypothesis. In contrast, ovariectomy did not affect allocation of nitrogen to femoral muscles. Further, allocation of carbon to the fat body or femoral muscles did not appear to be affected by ovariectomy. Total anti-oxidant activities in the hemolymph and femoral muscles were not affected by ovariectomy. These experiments showed that allocation of nutrients was altered little by ovariectomy in young grasshoppers. Additional studies on older individuals are needed to further test the disposable soma hypothesis. |
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Authors:
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Evan T Judd; John D Hatle; Michelle D Drewry; Frank J Wessels; Daniel A Hahn |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S. Date: 2010-08-16 |
Journal Detail:
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Title: Integrative and comparative biology Volume: 50 ISSN: 1557-7023 ISO Abbreviation: Integr. Comp. Biol. Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2011-05-11 Completed Date: 2011-09-29 Revised Date: 2011-11-01 |
Medline Journal Info:
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Nlm Unique ID: 101152341 Medline TA: Integr Comp Biol Country: England |
Other Details:
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Languages: eng Pagination: 818-28 Citation Subset: IM |
Affiliation:
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Department of Biology, University of North Florida, 1 UNF Drive, Jacksonville, Florida 32224, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aging
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physiology Animals Body Composition / physiology Energy Metabolism / physiology Female Food* Grasshoppers / physiology* Ovariectomy* Reproduction / physiology |
| Grant Support | |
ID/Acronym/Agency:
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R15 AG028512-01/AG/NIA NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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