Oviductal factors may be obtained by ultrafiltration of conditioned medium, added to a simple media and used in bovine embryo culture. In this study, we aimed to analyze the development of bovine embryos produced with oviductal factors compared to those cultured in the presence of BSA or serum, the effects of glucose in presence of these protein supplements, and the ability of oviductal factors...

Luteinizing hormone as other glycoprotein hormones is characterized by a heterodimeric structure composed a common α-subunit noncovalently linked to a specific β-subunit. The correct conformation of the heterodimer is important for efficient secretion, hormonal-specific post-translational modifications, receptor binding and signal transduction. To determine whether αand βsubunits can be synthes...

Abstract Damage to the bovine corpus luteum (CL) has been reported following modified-live virus vaccination (MLV). The objective of this study was investigate degree luteal apoptosis after MLV or inactivated vaccine (IV) administration at time artificial insemination. Beef females were estrous synchronized and on d 0 vaccinated with a IV being transrectally ultrasounded record presence locatio...

When grown under hypothermic conditions, CHO (Chinese-hamster ovary) cells become growth-arrested in the G0/G1 phase of the cell cycle and also often exhibit increased recombinant-protein production. We have shown in the accompanying paper [Fox, Tan, Tan, Wong, Yap and Wang (2005) Biotechnol. Appl. Biochem. 41, 255-264] that the positive effect of low temperature on recombinant-protein producti...

Polycystic ovary syndrome (PCOS), characterized by ovarian androgen excess, is the commonest endocrine disorder in women. Obesity increases androgen synthesis, a phenomenon attributed to the accompanying hyperinsulinemia. Our hypothesis was that adipokines, fat cell-derived hormones, play a direct role in modulating ovarian androgen secretion. Therefore, the aims of this study were to explore t...

Biologically active bovine luteinizing hormone (LH) has been obtained through expression of the alpha- and LH beta-subunit genes in stably transformed clones of DUXB11, a Chinese hamster ovary cell line deficient in dihydrofolate reductase (DHFR). Expression of alpha-and LH beta-subunit mRNAs of the expected sizes (approximately 910 and 770 nucleotides, respectively) were revealed by blot analy...

Recognition of the exposure of phosphatidylserine (PS) on the outer surface of plasma membrane has been implicated in the phagocytosis of aged/apoptotic cells. Because oxidized low-density lipoprotein (OxLDL) has been reported to block the phagocytosis, here we examined whether lectin-like OxLDL receptor 1 (LOX-1), the OxLDL receptor in endothelial cells, mediates phagocytosis of aged/apoptotic...

Lipopolysaccharide disturbs the secretion of gonadotropin, endometrial function and implantation efficiency. However, there is little information regarding the effects of lipopolysaccharide on cyclic ovary activity, especially oocyte maturation. Therefore, we aimed to investigate the effects of lipopolysaccharide on the maturation potential of bovine oocytes. We found that lipopolysaccharide ex...

Ovarian steroid hormones, mainly estrogen and progesterone, play a central role in the regulation of ovarian functions. The biological effects of progesterone (PR) and estrogen (ER) are dependent on the activation of both PR and ER isoforms. In the present study, we studied the cellular distribution and localization of progesterone receptor B (PR-B) and estrogen receptor alpha (ERα) in the bovi...

Mammalian glycosylphosphatidylinositol (GPI)-specific phospholipase D (GPI-PLD) is capable of releasing GPI-anchored proteins by cleavage of the GPI moiety. A previous study indicated that overexpression of GPI-PLD in mouse RAW 264.7 monocytes/macrophages could be cytotoxic, since survivors of stable transfections had enzymic activity no higher than untransfected cells [Du and Low (2001) Infect...