Journal
AMERICAN JOURNAL OF PHYSIOLOGY-REGULATORY INTEGRATIVE AND COMPARATIVE PHYSIOLOGY
Volume 308, Issue 9, Pages R792-R799Publisher
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajpregu.00327.2014
Keywords
prolactin; TGF-beta; TNF-alpha; obesity; diabetes
Categories
Funding
- CONACyT [SALUD-2011-1-161594, CB-2011-01-164423]
- UNAM [IB200411, IA200113]
- Programa de Doctorado en Ciencias Biomedicas of the Universidad Nacional Autonoma de Mexico (UNAM) [228328, 245847, 245828, 245224, 230452]
- Consejo Nacional de Ciencia y Tecnologia (CONACyT)
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The levels of the hormone prolactin (PRL) are reduced in the circulation of patients with Type 2 diabetes and in obese children, and lower systemic PRL levels correlate with an increased prevalence of diabetes and a higher risk of metabolic syndrome. The secretion of anterior pituitary (AP) PRL in metabolic diseases may be influenced by the interplay between transforming growth factor beta (TGF-beta) and tumor necrosis factor alpha (TNF-alpha), which inhibit and can stimulate AP PRL synthesis, respectively, and are known contributors to insulin resistance and metabolic complications. Here, we show that TGF-beta and TNF-alpha antagonize the effect of each other on the expression and release of PRL by the GH4C1 lactotrope cell line. The levels of AP mRNA and circulating PRL decrease in high-fat diet-induced obese rats in parallel with increased and reduced AP levels of TGF-beta and TNF-alpha mRNA, respectively. Likewise, AP expression and circulating levels of PRL are reduced in streptozotocin-induced diabetic rats and are associated with higher AP expression and protein levels of TGF-beta and TNF-alpha. The opposing effects of the two cytokines on cultured AP cells, together with their altered expression in the AP of obese and diabetic rats suggest they are linked to the reduced PRL production and secretion characteristics of metabolic diseases.
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