Effect of a High-Fat Diet on 24-Hour Pattern in Expression of Prolactin and Redox Pathway Enzymes in the Rat Adenohypophysis
Pilar Cano1, Daniel P. Cardinali*, 2, Vanesa Jimenez-Ortega1, Maria J. Rios-Lugo1, Pablo A. Scacchi2, Ana I. Esquifino1
Identifiers and Pagination:Year: 2010
First Page: 1
Last Page: 9
Publisher Id: TOOBESJ-2-1
Article History:Received Date: 24/06/2009
Revision Received Date: 09/10/2009
Acceptance Date: 09/10/2009
Electronic publication date: 9/6/2010
Collection year: 2010
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The effect of a high-fat diet (35% fat) on 24-h changes in expression of prolactin and redox pathway enzyme genes was examined in the anterior pituitary of male rats. When body weight of high-fat fed rats attained values about 20- 25 % higher than controls (after 66 days of treatment) animals were sacrificed at 6 different time intervals throughout a 24-h cycle. Anterior pituitary mRNA levels were measured by real-time PCR analysis. In control rats expression of the prolactin gene peaked in anterior pituitary at early scotophase, 3 h in advance to the peak in plasma prolactin levels. In high-fat fed rats this correlation was lost. A disruption of 24-h rhythmicity of pituitary gene expression of heme oxygenase (HO)-2, Cu/Zn- superoxide dismutases (SOD), Mn-SOD, catalase, glutathione peroxidase (GPx) and glutathione reductase (GR) was apparent in high-fat fed rats. Anterior pituitary mRNA levels for nitric oxide synthase (NOS)-2 and HO-2, Cu/Zn- and Mn- SOD and catalase augmented in high-fat fed rats, whereas those of GPx and GR decreased. The results indicate a disrupted coordination between prolactin gene expression and prolactin release in highfat fed rats that comes along with a disturbed expression of redox enzyme genes in the anterior pituitary.