Volume 19, Issue 3 pp. 391-397
Article
Free Access

Effects of oophorectomy on functional properties of resistance arteries isolated from the cancellous bone of the rabbit femur

Vibeke B. Hansen

Corresponding Author

Vibeke B. Hansen

Department of Obstetrics and Gynaecology, University of Aarhus, Skejby Hospital, Research Laboratory, 8200 Aarhus N, Denmark

Department of Obstetrics and Gynaecology, University of Aarhus, Skejby Hospital, Research Laboratory, 8200 Aarhus N, Denmark, Tel.: +45-8949-6391; fax: +45-8949-6373Search for more papers by this author
Axel Forman

Axel Forman

Department of Obstetrics and Gynaecology, University of Aarhus, Skejby Hospital, Research Laboratory, 8200 Aarhus N, Denmark

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Annette Lundgaard

Annette Lundgaard

Department of Orthopaedics, University of Aarhus, Aarhus, Denmark

Institute of Experimental Clinical Research, University of Aarhus, Aarhus, Denmark

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Christian Aalkjaer

Christian Aalkjaer

Department of Pharmacology, University of Aarhus, Aarhus, Denmark

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Kristjar Skajaa

Kristjar Skajaa

Department of Obstetrics and Gynaecology, University of Aarhus, Skejby Hospital, Research Laboratory, 8200 Aarhus N, Denmark

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Ebbe S. Hansen

Ebbe S. Hansen

Department of Orthopaedics, University of Aarhus, Aarhus, Denmark

Institute of Experimental Clinical Research, University of Aarhus, Aarhus, Denmark

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First published: 01 January 2006
Citations: 10

Abstract

Information is sparse concerning the effect of oophorectomy (OOX) on bone vascularization and blood flow of possible significance for altered remodeling. Whether OOX affects functional characteristics of isolated bone resistance arteries was investigated. Ring preparations (diameter ∼250 μm) of small femoral bone arteries from oophorectomized and sham-operated rabbits were mounted on a myograph six weeks postoperatively. Cumulative concentration-response curves were obtained for various agonists at a normalized lumen diameter. Oophorectomy did not significantly influence lumen diameter, maximal response to high potassium, or maximal response to high potassium and 10−5 M noradrenaline. However, OOX significantly increased the maximal response to noradrenaline (OOX 2.14 ± 0.36 N/m, Sham 1.25 ± 0.14 N/m) and endothelin-1 (OOX 1.76 ± 0.32, Sham 0.95 ± 0.15) in meta-physeal arteries. Moreover, the corresponding maximal active pressure for the agonists was significantly increased. OOX did not influence endothelial function assessed by the effects of acetylcholine or substance P. The functional responses of diaphyseal arteries were unaffected by OOX. The study demonstrates regional differences in the effects of OOX on small arteries of importance for control of vascular resistance in bone which suggests a relation between altered vascular function after ovarian hormonal withdrawal and the changes in bone turnover associated with osteoporosis. © 2001 Orthopaedic Research Society. Published by Elsevier Science Ltd. All rights reserved.

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