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Age-related changes in gene expression of the growth hormone secretagogue and growth hormone-releasing hormone receptors in Holstein-Friesian cattle

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Komatsu, M and Kojima, M and Okamura, H and Nishio, M and Kaneda, M and Kojima, T and Takeda, H and Malau-Aduli, AEO and Takahashi, H (2012) Age-related changes in gene expression of the growth hormone secretagogue and growth hormone-releasing hormone receptors in Holstein-Friesian cattle. Domestic Animal Endocrinology, 42 (2). pp. 83-93. ISSN 0739-7240

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Abstract

Growth hormone secretion from the anterior pituitary gland is controlled by interactions between three hormone receptors,between GHRH and GHRH receptor (GHRH-R), between ghrelin and growth hormone secretagogue receptor (GHS-R1a), and between somatostatin and somatostatin receptors in the hypothalamus and anterior pituitary gland. Ghrelin-GHS-R1a is involved in many important functions, including GH secretion and appetite. We investigated age-related changes in the expressions of GHS-R1a, GHS-R1b (the truncated-type receptor), and GHRH-R mRNAs by real-time reverse transcription-PCR using 16 tissues, leukocytes, oocytes, and cumulus cells in Holstein-Friesian cattle. The tissue samples were divided into three age classes: 1) 19 to 26 d of age (preweaning calves), 2) 2 mo to 6.5 mo of age (postweaning calves), and 3) 3.2 to 8.1 yr of age (cows). The GHS-R1a mRNA was highly (P<0.05) expressed in the arcuate nucleus, pituitary gland, and liver compared with that of the other tissues in all age classes. Expression of GHS-R 1a mRNA in the arcuate nucleus of postweaning calves was > 10-fold greater (P<0.01) than those of preweaning calves and cows, and its expression level was the greatest (P<0.01) in all tissues examined in age group 2. GHS-R1a and GHRH-R mRNA expressions in the pituitary gland of preweaning calves tended to be greater (P<0.20 and P<0.17, respectively) than those of postweaning calves and cows. GHS-R1b mRNA expression was detected in all tissues examined, and abundance was greater (P<0.05) in the pancreas, pituitary gland, spleen, arcuate nucleus, adipose tissue, and leukocyte compared with that of the other tissues examined in age group 3. Interestingly, a relatively large animal-to-animal variation was observed in pancreas GHS-R 1b mRNA expression. The GHRH-R mRNA was markedly increased (P<0.01) in the pituitary gland in all age groups compared with that of the other tissues. GHRH-R mRNA abundance in the arcuate nucleus, pituitary gland, liver, spleen, adipose tissue, and heart of preweaning calves tended to be greater than those of postweaning calves and cows. The GHRH-R mRNA was not detected in the mammary gland and adipose tissue of nonlactating cows.

Item Type: Article
Keywords: Growth hormone secretagogue receptor (GHS-R); GHRH-R; mRNA expression; Age-related change; Tissue distribution; Cattle
Journal or Publication Title: Domestic Animal Endocrinology
Page Range: pp. 83-93
ISSN: 0739-7240
Identification Number - DOI: 10.1016/j.domaniend.2011.09.006
Additional Information: The definitive version is available at http://www.sciencedirect.com
Date Deposited: 10 Jan 2012 04:37
Last Modified: 10 Jan 2012 04:37
URI: http://eprints.utas.edu.au/id/eprint/12539
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