Document Detail


Flaxseed combined with low-dose estrogen therapy preserves bone tissue in ovariectomized rats.
MedLine Citation:
PMID:  19182694     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: Flaxseed is rich in lignans and alpha-linolenic acid, compounds that may promote healthy skeletons. Many postmenopausal women consume complementary health products such as flaxseed or its components in addition to pharmacological agents such as low-dose estrogen therapy for additional support for menopausal symptoms and related conditions. However, their combined effect on bone health is unknown. The aim of this study was to determine the effects of 10% dietary flaxseed, low-dose estrogen therapy, or their combination on bone mineral density, biomechanical strength, and skeletal fatty acid composition in an ovariectomized rat model of postmenopausal osteoporosis. METHODS: Ovariectomized rats received (1) basal diet (negative control), (2) 10% flaxseed, (3) low-dose estrogen implant (13 microg, 90 day release), or (4) flaxseed + low-dose estrogen implant for 12 weeks. A sham-operated group was included as a positive control. Bone mineral density, biomechanical strength, and fatty acid composition were measured at multiple skeletal sites. RESULTS: Flaxseed + low-dose estrogen therapy resulted in the highest bone mineral density and peak load at the lumbar vertebrae, with no effect on bone mineral density or strength in the tibia and femur. Flaxseed and flaxseed + low-dose estrogen therapy resulted in significantly higher relative levels of alpha-linolenic acid and eicosapentaenoic acid and lower levels of linoleic acid, arachidonic acid, and n-6/n-3 ratio in the lumbar vertebrae and tibia compared with all other groups. CONCLUSION: Flaxseed + low-dose estrogen therapy provides the greatest protection against ovariectomy-induced bone loss at the lumbar vertebrae. Moreover, this study is the first to demonstrate that flaxseed, rich in alpha-linolenic acid, alters fatty acid composition in the ovariectomized rat skeleton.
Authors:
Sandra M Sacco; Jessica M Y Jiang; Sandra Reza-López; David W L Ma; Lilian U Thompson; Wendy E Ward
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Menopause (New York, N.Y.)     Volume:  16     ISSN:  1530-0374     ISO Abbreviation:  Menopause     Publication Date:    2009 May-Jun
Date Detail:
Created Date:  2009-05-11     Completed Date:  2009-07-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9433353     Medline TA:  Menopause     Country:  United States    
Other Details:
Languages:  eng     Pagination:  545-54     Citation Subset:  IM    
Affiliation:
Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, ON, Canada.
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MeSH Terms
Descriptor/Qualifier:
Animals
Bone Density / drug effects*
Bone Density Conservation Agents / therapeutic use*
Combined Modality Therapy
Dietary Supplements*
Disease Models, Animal
Estrogens / therapeutic use*
Female
Flax / chemistry*
Humans
Lumbar Vertebrae / chemistry
Osteoporosis, Postmenopausal / prevention & control*
Ovariectomy
Rats
Rats, Sprague-Dawley
Tibia / chemistry
Chemical
Reg. No./Substance:
0/Bone Density Conservation Agents; 0/Estrogens

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


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