Journal
THERIOGENOLOGY
Volume 83, Issue 4, Pages 662-669Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.theriogenology.2014.10.031
Keywords
Fescue toxicosis; Prolactin; Prolactin receptor; Prolactin-inducible protein
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Funding
- NIFA/USDA [SC-1700376]
- National Research Initiative Competitive grant from USDA National Institute of Food and Agriculture [2010-38942-20745]
- Cooperative State Research, Education and Extension Service
- NIFA [2010-38942-20745, 580871] Funding Source: Federal RePORTER
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The objectives of this study were to determine (1) the presence and expression levels of bovine prolactin receptor (PRLR) and prolactin-inducible protein (PIP) in bovine testis and epididymis, and (2) the presence and concentrations of prolactin (PRL) present in seminiferous fluid in bulls consuming diets with (E+) or without (E-) ergot alkaloids. Bulls (n = 8) were sacrificed after 126 days (group A) of E+ or E- treatment or 60 days after all bulls (n = 6) were switched to the E- ration (group B). End point and real-time quantitative reverse transcription-polymerase chain reaction and immunohistochemistry were conducted on testis and epididymis samples to establish the presence and relative expression of PRLR and PIP. Seminal fluid samples obtained from bulls consuming E- and E+ diets were subjected to RIA for PRL. Both PIP and PRLR were present in testis and epididymis as determined by reverse transcription-polymerase chain reaction and immunohistochemistry. Prolactin-inducible protein mRNA abundance was affected by time of slaughter in testis and epididymis head, respectively (P < 0.05). Prolactin receptor mRNA expression was affected by time of slaughter in the epididymis (P < 0.05) and differed in testis samples because of treatment (P < 0.05). Radioimmunoassay establishes the presence of PRL in seminal fluid; however, differences in the concentration of PRL over two separate studies were inconsistent, possibly because of differences in diet. The presence and localization of the PRLR are consistent with expression data reported for other species, and the presence of PIP and PRL in seminal fluid is consistent with data generated in humans. (C) 2015 Elsevier Inc. All rights reserved.
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