Document Detail

Host regulation and the embryonic development of the endoparasitoid Toxoneuron nigriceps (Hymenoptera: Braconidae).
MedLine Citation:
PMID:  15081998     Owner:  NLM     Status:  MEDLINE    
Insect endoparasitoids modulate the host physiology through the injection of maternal-derived substances into the host, inducing physiological and hormonal changes in the host's internal environment to benefit parasitoid development. These changes are direct to control host development and regulate nutrient availability to the developing parasitoid, and they are synchronized with parasitoid development. Eggs of some of these parasitoids have low yolk content and require nutrients from the host hemolymph to initiate and complete embryogenesis. We report changes in the amino acid composition and protein profile of the host hemolymph of the endoparasitoid Toxoneuron nigriceps, and improved the in vitro culture of pre-germ band stage eggs. The protein profile of parasitized larvae was similar to controls throughout the embryonic development, but total amino acid concentration decreased in the first 2 h after parasitization, significantly increasing in the following hours up to 8 h. Amino acid levels were higher in parasitized larvae from 16 to 28 h after parasitization. Comparison of single amino acids indicated amino acids involved in energy metabolism (Krebs cycle) followed a trend during parasitoid embryogenesis, and their changes were correlated with embryonic development. Improvement in the in vitro development of 6 h-old eggs of T. nigriceps was obtained by adding factors released by the host fat body to the artificial medium, while a cell lysate stimulated embryogenesis and allowed the full development of newly laid eggs in vitro.
Fernando L Consoli; S Bradleigh Vinson
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology     Volume:  137     ISSN:  1096-4959     ISO Abbreviation:  Comp. Biochem. Physiol. B, Biochem. Mol. Biol.     Publication Date:  2004 Apr 
Date Detail:
Created Date:  2004-04-14     Completed Date:  2004-11-29     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  9516061     Medline TA:  Comp Biochem Physiol B Biochem Mol Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  463-73     Citation Subset:  IM    
Department of Entomology, ERL, Texas A&M University, College Station, TX 77843-2475, USA.
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MeSH Terms
Amino Acids / metabolism
Cell Line
Culture Media, Conditioned
Electrophoresis, Polyacrylamide Gel
Energy Metabolism / physiology
Hemolymph / metabolism
Host-Parasite Interactions / physiology*
Hymenoptera / embryology*,  physiology
Larva / growth & development*
Nutritional Status / physiology
Proteins / metabolism
Time Factors
Reg. No./Substance:
0/Amino Acids; 0/Culture Media, Conditioned; 0/Proteins

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