Document Detail


Lactate reverses insulin-induced hypoglycemic stupor in suckling-weanling mice: biochemical correlates in blood, liver, and brain.
MedLine Citation:
PMID:  6313715     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The recovery of weanling mice from insulin-induced hypoglycemic stupor-coma after injection of sodium -L(+)-lactate (18 mmol/kg) was as rapid (10 min) as in litter-mates treated with glucose (9 mmol/kg). Stimulated by this dramatic action, we studied the effects of lactate injection on brain carbohydrate and energy metabolism in normal and hypoglycemic mice; blood and liver tissue were also studied. Ten minutes after lactate injection in normal mice, plasma lactate levels increased by 15 mmol/L; plasma glucose levels were unchanged, but the beta-hydroxybutyrate concentration fell 59%. In the brains of these animals, glucose levels increased 2.3-fold, and there were significant increases in brain glycogen (10%), glucose-6-phosphate (27%), lactate (68%), pyruvate (37%), citrate (12%), and malate (19%); the increase in alpha-ketoglutarate (32%) was not significant. Lactate injection reduced the cerebral glucose-use rate 40%. These changes were not due to lactate-induced increases in blood [HCO-3] and pH (examined by injection of 15 mmol/kg sodium bicarbonate). Although lactate injection of hypoglycemic mice doubled levels of glucose in plasma and brain (not significant) and most of the cerebral glycolytic intermediates, values were far below normal (still in the range seen in hypoglycemic animals). By contrast, citrate and alpha-ketoglutarate levels returned to normal; the large increase in malate was not significant. Reduced glutamate levels increased to normal, and elevated aspartate levels fell below normal. Thus, recovery from hypoglycemic stupor does not necessarily depend on normal levels of plasma and/or brain glucose (or glycolytic intermediates).(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
J H Thurston; R E Hauhart; J A Schiro
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism     Volume:  3     ISSN:  0271-678X     ISO Abbreviation:  J. Cereb. Blood Flow Metab.     Publication Date:  1983 Dec 
Date Detail:
Created Date:  1983-12-17     Completed Date:  1983-12-17     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8112566     Medline TA:  J Cereb Blood Flow Metab     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  498-506     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Animals, Suckling
Bicarbonates / blood,  pharmacology
Brain / metabolism*
Energy Metabolism / drug effects
Hydrogen-Ion Concentration
Hypoglycemia / metabolism*
Insulin Coma / blood,  metabolism*
Lactates / metabolism,  pharmacology*
Lactic Acid
Liver / metabolism*
Mice
Oxidation-Reduction
Sodium Bicarbonate
Grant Support
ID/Acronym/Agency:
NS 06163/NS/NINDS NIH HHS; NS 15660/NS/NINDS NIH HHS; NS-6663/NS/NINDS NIH HHS
Chemical
Reg. No./Substance:
0/Bicarbonates; 0/Lactates; 144-55-8/Sodium Bicarbonate; 50-21-5/Lactic Acid

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


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