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M9610324.TXT
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1996-01-30
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Document 0324
DOCN M9610324
TI Toxicology of cupric salts on honeybees. IV--Gluconate and sulfate
action on hemolymph trehalose activity in vivo and in vitro.
DT 9601
AU Nectoux M; Bounias M; Popeskovic D; INRA Phytopharmacy Department,
University of Avignon, France.
SO J Biochem Toxicol. 1995 Apr;10(2):79-86. Unique Identifier : AIDSLINE
MED/96035095
AB A biphasic increase of hemolymph glucose levels was observed following
injection to bees of cupric gluconate or sulfate, both potent agents for
the control of Varroa jacobsoni, a parasitic mite of hives. The
simultaneous injection to bees of 0.3 microM BAYg5421 (an inhibitor of
alpha-glucosidases) quenched the response, suggesting a direct effect of
2 nmol/bee cupric ions on trehaloses' activity. One nanomol of injected
cupric gluconate increased the trehalose (Tre) activity by 233% in crude
hemolymph extracts at 1 mM trehalose concentration, and exhibited
biphasic dose-related effects with a maximum 15% increase at 0.5 mM
cupric ion and a stabilized 20% inhibition from 4 mM, regardless of the
anionic moiety. Upon partial purification of the enzyme complex, two
fractions (FI = 75% and FII = 25% of total activity) were isolated that
exhibited, respectively, less and more marked positive cooperatively
than crude extract. Form I showed almost no susceptibility to either
cupric derivatives, which indicated form II as the most likely target,
with 68% and 72% increases with 0.25 mM cupric sulfate and 0.5 mM cupric
gluconate, in presence of 16 mM trehalose.
DE Animal Bees/DRUG EFFECTS/*PHYSIOLOGY Copper/*TOXICITY Female
Gluconates/*TOXICITY Hemolymph/METABOLISM Hypoglycemic
Agents/PHARMACOLOGY Kinetics Regression Analysis
Trehalose/*METABOLISM Trisaccharides/PHARMACOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).