Document Detail


Porcine bioprosthetic valve calcification in bovine left ventricle-aorta shunts: studies of the deposition of vitamin K-dependent proteins.
MedLine Citation:
PMID:  6603825     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Calcification of glutaraldehyde-preserved bioprosthetic cardiac valves represents a serious clinical problem. Previous work from this laboratory has established the presence in clinical bioprosthetic valve calcifications of vitamin K-dependent calcium-binding proteins, which contain the calcium-binding amino acid gamma-carboxyglutamic acid; no proteins containing gamma-carboxyglutamic acid are present in nonmineralized valves. The purpose of the present study was to examine a series of bovine circulatory bioprosthetic valve explants for calcification and proteins containing gamma-carboxyglutamic acid. Biochemical analyses of explanted bioprosthetic valves from calves demonstrated proteins with gamma-carboxyglutamic acid accumulating in calcified valves during both the onset and progression of valve calcification; calcium levels in the explanted calf bioprostheses were in the same range as those noted in clinical material. Accumulation of calcium and protein with gamma-carboxyglutamic acid occurred simultaneously and progressively, beginning 2 months after implantation. Small amounts of osteocalcin, the bone-derived protein containing gamma-carboxyglutamic acid, were present in both human and bovine bioprosthetic valve calcifications at comparable levels. No osteocalcin was detectable in non-mineralized valve tissue. Warfarin anticoagulant therapy did not prevent calcification or accumulation of protein with gamma-carboxyglutamic acid. It is concluded that proteins containing gamma-carboxyglutamic acid are involved in both the onset and progression of bioprosthetic valve calcification, and that conventional means of vitamin K antagonism do not alter this association or the course of bioprosthetic valve mineralization.
Authors:
R J Levy; J A Zenker; W F Bernhard
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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:  The Annals of thoracic surgery     Volume:  36     ISSN:  0003-4975     ISO Abbreviation:  Ann. Thorac. Surg.     Publication Date:  1983 Aug 
Date Detail:
Created Date:  1983-09-09     Completed Date:  1983-09-09     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  15030100R     Medline TA:  Ann Thorac Surg     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  187-92     Citation Subset:  AIM; IM    
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MeSH Terms
Descriptor/Qualifier:
1-Carboxyglutamic Acid / metabolism
Adolescent
Animals
Aortic Valve / metabolism*,  surgery
Bioprosthesis*
Calcinosis / metabolism*
Calcium / metabolism
Calcium-Binding Proteins / metabolism*
Cattle
Child
Child, Preschool
Heart Valve Prosthesis*
Humans
Male
Osteocalcin
Prothrombin Time
Warfarin / therapeutic use
Grant Support
ID/Acronym/Agency:
HL 24029/HL/NHLBI NIH HHS; HL 24463/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
0/Calcium-Binding Proteins; 104982-03-8/Osteocalcin; 53445-96-8/1-Carboxyglutamic Acid; 7440-70-2/Calcium; 81-81-2/Warfarin

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


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