Yazar "Wiltbank, Milo C." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • [ X ]
    Öğe
    Patterns of Gene Expression in the Bovine Corpus Luteum Following Repeated Intrauterine Infusions of Low Doses of Prostaglandin F2alpha
    (Soc Study Reproduction, 2012) Atli, Mehmet O.; Bender, Robb W.; Mehta, Vatsal; Bastos, Michele R.; Luo, Wenxiang; Vezina, Chad M.; Wiltbank, Milo C.
    Natural luteolysis involves multiple pulses of prostaglandin F2alpha (PGF) released by the nonpregnant uterus. This study investigated expression of 18 genes from five distinct pathways, following multiple low-dose pulses of PGF. Cows on Day 9 of the estrous cycle received four intrauterine infusions of 0.25 ml of phosphate-buffered saline (PBS) or PGF (0.5 mg of PGF in 0.25 ml of PBS) at 6-h intervals. A luteal biopsy sample was collected 30 min after each PBS or PGF infusion. There were four treatment groups: Control (n = 5; 4 PBS infusions), 4XPGF (4 PGF infusions; n = 5), 2XPGF-non-regressed (2 PGF infusions; n = 5; PGF-PBS-PGF-PBS; no regression after treatments), and 2XPGF-regressed (PGF-PBS-PGF-PBS; regression after treatments; n = 5). As expected, the first PGF pulse increased mRNA for the immediate early genes JUN, FOS, NR4A1, and EGR1 but unexpectedly also increased mRNA for steroidogenic (STAR) and angiogenic (VEGFA) pathways. The second PGF pulse induced immediate early genes and genes related to immune system activation (IL1B, FAS, FASLG, IL8). However, mRNA for VEGFA and STAR were decreased by the second PGF infusion. After the third and fourth PGF pulses, a distinctly luteolytic pattern of gene expression was evident, with inhibition of steroidogenic and angiogenic pathways, whereas, there was induction of pathways for immune system activation and production of PGF. The pattern of PGF-induced gene expression was similar in corpus luteum not destined for luteolysis (2X-non-regressed) after the first PGF pulse but was very distinct after the second PGF pulse. Thus, although the initial PGF pulse induced mRNA for many pathways, the second and later pulses of PGF appear to have set the distinct pattern of gene expression that result in luteolysis.
  • [ X ]
    Öğe
    Toll-like receptor 2 and 4 expression in the bovine corpus luteum during the different stages of the estrous cycle
    (Brazilian Coll Animal Reproduction, 2017) Atli, Mehmet Osman; Kose, Mehmet; Kaya, Mehmet Salih; Aydilek, Nurettin; Guzeloglu, Aydin; Wiltbank, Milo C.
    The aim of this study was to elucidate the presence of components of the innate immune system in the bovine corpus luteum (CL) by detecting the expression and cell-specific localization of TLR2 and TLR4 during different stages of the estrous cycle in a control study design. Bovine CL samples were collected from a local slaughterhouse and assigned to three groups as follows: developing CL (dCL; n = 6, approx. days 3-6), mature CL (mCL; n = 5, approx. days 8-12), and regressing CL (rCL; n = 5, approx. days 17-19). An upregulation of TLR2 mRNA was detected only in rCL (P < 0.05). Localization of the TLR2 protein was particularly apparent in luteal cells and a prominent immunofluorescent signal corresponding to TLR2 was detected only in rCL. TLR4 mRNA were higher in mCL and rCL compared to dCL (P < 0.05). The presence of the TLR4 protein in bovine CL was clearly detected in the luteal cells of both mCL and rCL. The results of this study suggest a role for TLRs in the development, maintenance, and regression of bovine CL. TLR signaling mediated pathway in luteal cells may involve in the regression of CL via regulation of TLR2 and TLR4.