Seasonal differences in seminal plasma proteins from two bovine breeds adapted to a subtropical climate

Souto, Paula Lorena Grangeira; Carmouy, Lilian Silveira Travassos; Santos, Cristiane dos; Martins, Edison; Martins, Vera Maria Villamil; Hatamoto-Zervoudakis, Luciana Keiko; Murad, André M.; Mehta, Ângela; McManus, Concepta; Ramos, A.F.

doi:10.1007/s11250-020-02536-8

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“…The roles of the GPX3 and GPX6 are not clearly defined in the CL, although we speculate that they exert a similar function related to reducing ROS. GPX3 is most highly abundant in blood [77], and previously researchers have demonstrated that the mRNA encoding Gpx6 has been located in limited tissues including embryos, olfactory epithelium, sperm, seminal plasma, and the ovaries in humans [77][78][79][80][81][82]. The present study provides novel evidence of the presence and role for GPX6 in the CL of cows, and that the Gpx6 mRNA abundance is significantly affected by the form of Se, with mRNA encoding Gpx6 being increased in the CL from cows in the MIX treatment group.…”

Section: Discussionmentioning

confidence: 99%

Form of Supplemental Selenium Affects the Expression of mRNA Transcripts Encoding Selenoproteins, and Proteins Regulating Cholesterol Uptake, in the Corpus Luteum of Grazing Beef Cows

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Selenium (Se)-deficient soils necessitate supplementation of this mineral to the diet of forage-grazing cattle. Functionally, Se is incorporated into selenoproteins, some of which function as important antioxidants. We have previously shown that the source of supplemental Se; inorganic (sodium selenite or sodium selenate; ISe), organic (selenomethionine or selenocysteine; OSe) or 1:1 mix of ISe and OSe (MIX), provided to Angus-cross cows affects concentrations of progesterone (P4) during the early luteal phase of the estrous cycle. In this study, we sought to investigate (1) the effect of form of Se on the expression of mRNA encoding selenoproteins in the corpus luteum (CL), and (2) whether this previously reported MIX-induced increase in P4 is the result of increased luteal expression of key steroidogenic transcripts. Following a Se depletion and repletion regimen, 3-year-old, non-lactating, Angus- cross cows were supplemented with either ISe as the industry standard, or MIX for at least 90 days, with the CL then retrieved on Day 7 post-estrus. Half of each CL was used for analysis of targeted mRNA transcripts and the remainder was dissociated for culture with select agonists. The expression of three selenoprotein transcripts and one selenoprotein P receptor was increased (p < 0.05), with an additional five transcripts tending to be increased (p < 0.10), in cows supplemented with MIX versus ISe. In cultures of luteal cells, hCG-induced increases in P4 (p < 0.05) were observed in CL obtained from ISe-supplemented cows. The abundance of steroidogenic transcripts in the CL was not affected by the form of Se, however, the abundance of mRNA encoding 2 key transcripts regulating cholesterol availability (Ldlr and Hsl) was increased (p < 0.05) in MIX-supplemented cows. Overall, the form of Se provided to cows is reported to affect the expression of mRNA encoding several selenoproteins in the CL, and that the form of Se-induced effects on luteal production of P4 appears to be the result of changes in cholesterol availability rather than a direct effect on the expression of steroidogenic enzymes within the CL.

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