Document Detail


Associations between amino acids and bone mineral density in men with idiopathic osteoporosis.
MedLine Citation:
PMID:  20813216     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Idiopathic osteoporosis in middle-aged men is characterized by low-level bone formation. Inhibited anabolism may be involved in the pathogenesis of the disease and amino acids may be of importance. In the present study fasting amino acid profiles in plasma and erythrocytes were determined in 22 male idiopathic osteoporosis (MIO) patients and in 20 age-matched healthy men and associated with bone mineral density, bone histomorphometry and hormones. The osteoporotic patients had normal plasma essential amino acids but increased non-essential amino acids (p=0.001), particularly glutamine and glycine. The ratio essential/non-essential amino acids, an index of protein nutritional status, was decreased in the MIO patients (0.59 (0.04) μmol/l, mean (SD)), compared to controls (0.66 (0.05), p=0.001). In the MIO patients, the ratio essential/non-essential plasma amino acids (r=0.60, p=0.003) was positively correlated with lumbar spine bone mineral density. The erythrocyte amino acids represent a large proportion of the free amino acids in blood. A novel finding was the lower levels of erythrocyte tryptophan in MIO (12 (2) μmol/l) compared to controls (16 (3), p=0.001) and decreased erythrocyte/plasma ratio (0.28 (0.07) vs. 0.33, (0.06), p<0.01), suggesting an altered amino acid transport of tryptophan between plasma and erythrocytes. In the combined group of MIO and control men (n=42), bone mineral density was positively correlated with erythrocyte tryptophan in both the lumbar spine (r=0.45, p=0.003) and femoral neck (r=0.56, p<0.001). The bone histomorphometric variables wall thickness, trabecular thickness and mineral apposition rate were all positively associated with erythrocyte tryptophan levels in the MIO patients. In the combined group of MIO and controls, a multiple regression analysis showed that erythrocyte tryptophan could explain 22% of the variation of lumbar spine and 30% of the variation in femoral neck bone mineral density. We conclude that men with idiopathic osteoporosis have changes in free amino acid profiles which indicate their altered utilization. The correlations between tryptophan and bone mineral density and bone histomorphometry suggest a link between tryptophan and osteoblast function which may be important for bone health.
Authors:
Ylva Pernow; Marja Thorén; Maria Sääf; Rita Fernholm; Björn Anderstam; Ellen M Hauge; Kerstin Hall
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-09-08
Journal Detail:
Title:  Bone     Volume:  47     ISSN:  1873-2763     ISO Abbreviation:  Bone     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-10-11     Completed Date:  2011-01-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8504048     Medline TA:  Bone     Country:  United States    
Other Details:
Languages:  eng     Pagination:  959-65     Citation Subset:  IM    
Copyright Information:
Copyright © 2010. Published by Elsevier Inc.
Affiliation:
Department of Endocrinology, Metabolism and Diabetes, Karolinska University Hospital Solna, Karolinska Institutet, Stockholm, Sweden. ylva.pernow@ki.se
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Amino Acids / blood*
Bone Density / physiology*
Case-Control Studies
Humans
Insulin / blood
Insulin-Like Growth Factor Binding Protein 1 / blood
Insulin-Like Growth Factor I / metabolism
Male
Middle Aged
Osteoporosis / blood*,  metabolism*
Chemical
Reg. No./Substance:
0/Amino Acids; 0/Insulin-Like Growth Factor Binding Protein 1; 11061-68-0/Insulin; 67763-96-6/Insulin-Like Growth Factor I

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


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