Graaf-Roelfsema, Ellen de;
Tharasanit, Theerawat;
Dam, Klien G. van;
Keizer, Hans A.;
Breda, Erik van;
Wijnberg, Inge D.;
Stout, Tom A. E.;
Kolk, Johannes H. van der
Effects of short- and long-term recombinant equine growth hormone and short-term hydrocortisone administration on tissue sensitivity to insulin in horses
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Media type:
E-Article
Title:
Effects of short- and long-term recombinant equine growth hormone and short-term hydrocortisone administration on tissue sensitivity to insulin in horses
Contributor:
Graaf-Roelfsema, Ellen de;
Tharasanit, Theerawat;
Dam, Klien G. van;
Keizer, Hans A.;
Breda, Erik van;
Wijnberg, Inge D.;
Stout, Tom A. E.;
Kolk, Johannes H. van der
Published:
American Veterinary Medical Association (AVMA), 2005
Published in:
American Journal of Veterinary Research, 66 (2005) 11, Seite 1907-1913
Language:
Not determined
DOI:
10.2460/ajvr.2005.66.1907
ISSN:
0002-9645
Origination:
Footnote:
Description:
AbstractObjective—To determine the effects of short-term IV administration of hydrocortisone or equine growth hormone (eGH) or long-term IM administration of eGH to horses on tissue sensitivity to exogenous insulin.Animals—5 Standardbreds and 4 Dutch Warmblood horses.Procedure—The euglycemic-hyperinsulinemic clamp technique was used to examine sensitivity of peripheral tissues to exogenous insulin 24 hours after administration of a single dose of hydrocortisone (0.06 mg/kg), eGH (20 µg/kg), or saline (0.9% NaCl) solution and after long-term administration (11 to 15 days) of eGH to horses. The amounts of metabolized glucose (M) and plasma insulin concentration (I) were determined.Results—Values for M and the M-to-I ratio were significantly higher 24 hours after administration of a single dose of hydrocortisone than after single-dose administration of eGH or saline solution. After long-term administration of eGH, basal I concentration was increased and the mean M-to-I ratio was 22% lower, compared with values for horses treated with saline solution.Conclusions and Clinical Relevance—Increases in M and the M-to-I ratio after a single dose of hydrocortisone imply that short-term hydrocortisone treatment increases glucose use by, and insulin sensitivity of, peripheral tissues. Assuming a single dose of hydrocortisone improves sensitivity of peripheral tissues to insulin, it may be an interesting candidate for use in reducing insulin resistance in peripheral tissues of horses with several disease states. In contrast, long-term administration of eGH decreased tissue sensitivity to exogenous insulin associated with hyperinsulinemia. Therefore, increased concentrations of growth hormone may contribute to insulin resistance in horses with various disease states. (Am J Vet Res2005;66:1907–1913)