Document Detail


Homocysteine-lowering action is another potential cardiovascular protective factor of aged garlic extract.
MedLine Citation:
PMID:  16484555     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We investigated hypohomocysteinemic action as a cardiovascular protective property of aged garlic extract (AGE). Hyperhomocysteinemia was induced in rats by feeding folate-depleted diets. Plasma folate concentrations of 5, 24, and 202 nmol/L were detected in rats fed a folate-deficient L-amino acid diet containing succinyl sulfathiazole, an AIN-93G folate-deficient diet, and an AIN-93G folate-sufficient diet, respectively. Plasma concentrations of total homocysteine were elevated to the highest level (32 micromol/L) by severe folate deficiency and to a moderate level (9 micromol/L) by mild folate deficiency, compared with the lowest level of (5 micromol/L), noted for the folate-sufficient group. The addition of AGE to the severely folate-deficient diet decreased plasma total homocysteine concentration by 30%. Hyperhomocysteinemia caused by mild folate deficiency remained unaltered by AGE supplementation. The reduction in total homocysteine of the severely folate-deficient rats was accompanied by a proportional decrease in protein-bound and free homocysteine, resulting in an unchanged protein-bound:free homocysteine ratio. AGE added to the diet did not alter plasma concentrations of other aminothiol compounds: cysteine, glutathione, and cysteinylglycine. These data, together with increased S-adenosylmethionine and decreased S-adenosylhomocysteine concentrations in the liver, suggest that the hypohomocysteinemic effect of AGE most likely stems from impaired remethylation of homocysteine to methionine and enhanced transsulfuration of homocysteine to cystathionine. More importantly, in addition to its cholesterol-lowering potential, blood pressure-lowering effect, and antioxidant property, a hypohomocysteinemic action may be another important cardiovascular protective factor of AGE.
Authors:
Yu-Yan Yeh; Shaw-mei Yeh
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of nutrition     Volume:  136     ISSN:  0022-3166     ISO Abbreviation:  J. Nutr.     Publication Date:  2006 Mar 
Date Detail:
Created Date:  2006-02-17     Completed Date:  2006-05-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0404243     Medline TA:  J Nutr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  745S-749S     Citation Subset:  IM    
Affiliation:
Department of Nutritional Sciences, The Pennsylvania State University, University Park, PA 16803, USA. haru-amagase@wakunaga.com
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MeSH Terms
Descriptor/Qualifier:
Animals
Disease Models, Animal
Folic Acid / blood
Folic Acid Deficiency / blood
Garlic*
Homocysteine / antagonists & inhibitors*,  blood
Hyperhomocysteinemia / prevention & control*
Male
Phytotherapy*
Plant Extracts / therapeutic use*
Rats
Rats, Sprague-Dawley
Chemical
Reg. No./Substance:
0/Plant Extracts; 454-28-4/Homocysteine; 59-30-3/Folic Acid

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


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