In this study, we examine the molecular mechanism by which RV P p

In this study, we examine the molecular mechanism by which RV P protein determines viral pathogenicity by comparing the IFN antagonist activities of the Nishigahara and Ni-CE P proteins. The results, obtained from both RV-infected cells and cells transfected to express P protein only, show that Ni-CE P protein is significantly impaired for its capacity to block IFN-activated STAT1 nuclear translocation and, consequently, inhibits IFN signaling less efficiently than Nishigahara P protein. Further, it was demonstrated that a defect in the nuclear export of Ni-CE P protein correlates with a defect in its ability to cause the mislocalization of STAT1. These data provide the first evidence that

the capacity of the RV P protein to inhibit STAT1 nuclear translocation and IFN signaling correlates with the viral pathogenicity.”
“The nucleus accumbens (NAcc) mediates feeding reward; its learn more activity reflects tastants’ hedonic value. NAcc dopamine guides immediate responses to reward, however, its involvement in establishing long-term responses after a period of exposure to palatable foods has not been defined. Furthermore, reward-driven overeating propels weight increase, but the scale of weight gain depends on animals’ obesity-prone (OP) or -resistant (OR) phenotype. It is unclear whether the NAcc dopamine response to palatable food depends on obesity susceptibility. We investigated the effect

of unrestricted extended access to high-fat high-sugar (HFHS) diet on expression of genes encoding dopamine receptors in the NAcc of OP and OR rats. We examined persistence of HFHS diet-induced changes in D(1) and D(2) gene expression in OP and OR rats subjected to HFHS withdrawal (bland chow for 18 days). Effects of restricted access to HFHS by pair-feeding were also studied. Using reverse transcriptase PCR (RT-PCR), we found that NAcc YM155 molecular weight D(1) mRNA was downregulated after long-term HFHS access in OP vs. OR animals. The effect was also observed after 18 days of HFHS withdrawal. Furthermore, restricted HFHS led to downregulation of D(1) as well as of D(2) mRNA levels compared to chow-fed controls. A

difference in the expression of mu opioid receptor in the NAcc was also detected between the OP and OR rats during access to palatable food but not after withdrawal. We conclude that exposure to HFHS diets has lasting consequences for the NAcc dopamine system, perhaps modifying the motivation to search for food reward. The fact that the NAcc D(1) expression changes in OP animals after long-term exposure to palatable food and that this effect extends well into the reward discontinuation phase, implicates the D(1) receptor in the propensity to overeat and, in effect, gain weight in obesity prone individuals. (C) 2010 IBRO. Published by Elsevier Ltd. All rights reserved.”
“Group A rotaviruses (RV), members of the Reoviridae family, are a major cause of infantile acute gastroenteritis.

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