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Kristjar Skajaa

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

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  • Vibeke Brogaard Hansen, Department of Obstetrics and Gynecology, Aarhus University Hospital, Aarhus, Denmark
  • A Forman
  • Anette Lundgaard, Department of Orthopedic Surgery, Aarhus University Hospital, Aarhus, Denmark., Denmark
  • C Aalkjaer
  • K Skajaa
  • Ebbe Stender Hansen

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 approximately 250 microm) 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 metaphyseal 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.

Original languageEnglish
JournalJournal of Orthopaedic Research
Volume19
Issue3
Pages (from-to)391-7
Number of pages7
ISSN0736-0266
DOIs
Publication statusPublished - May 2001

    Research areas

  • Acetylcholine, Animals, Arteries, Bradykinin, Dose-Response Relationship, Drug, Drug Interactions, Endothelin-1, Female, Femur, Muscle Contraction, Muscle, Smooth, Vascular, Myography, Norepinephrine, Ovariectomy, Potassium, Rabbits, Substance P, Vasoconstrictor Agents, Vasodilator Agents, Vasopressins, Journal Article, Research Support, Non-U.S. Gov't

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ID: 119050422