To test the hypothesis that repeated damage to the olfactory epithelium causes reduced olfactory bulb afferent input and cessation of treatment allows recovery, we chronically ablated the olfactory organ every 2-3 days for 3 weeks with the detergent Triton X-100 while another group was allowed 3 weeks of recovery following treatment. Animals receiving selleck kinase inhibitor chronic treatment showed severe morphological
disruption of the olfactory organ, although small pockets of epithelium remained. These pockets were labeled by anti-calretinin, indicating the presence of mature olfactory sensory neurons (OSNs). Following a recovery period, the epithelium was more extensive and neuronal labeling increased, with three different morphologies of sensory neurons observed. Repeated peripheral exposure to Triton X-100 also affected the olfactory bulb. Bulb volumes and anti-tyrosine hydroxylase-like immunoreactivity, which is an indicator of afferent activity, were diminished in the olfactory bulb of the chronically treated group compared to the control side. In the recovery group, there was little difference in bulb volume or antibody staining. These results suggest that repeated, long-term nasal irrigation with Triton X-100 eliminates a substantial number of mature
OSNs and reduces afferent input to the olfactory bulb. It also appears that these effects are reversible and regeneration will occur in both the peripheral olfactory organ and the olfactory bulb when given time to recover following cessation of treatment. BI-D1870 in vivo We report here a new method that allows observation not only of the effects of deafferentation on the olfactory bulb but also the effects of reinnervation. (C) 2011 IBRO. Published by Elsevier Ltd. All rights reserved.”
“Previous results suggested that the U(L)31 gene of herpes simplex virus 1 (HSV-1) is required for envelopment of nucleocapsids at the inner nuclear membrane and optimal viral DNA synthesis and DNA packaging. In the current study, viral gene expression and NF-kappa B and c-Jun N-terminal kinase (JNK) activation of a herpes simplex virus mutant lacking the U(L)31 gene, designated
Delta U(L)31, and its genetic repair construct, designated Delta U(L)31-R, were studied see more in various cell lines. In Hep2 and Vero cells infected with Delta U(L)31, expression of the immediate-early protein ICP4, early protein ICP8, and late protein glycoprotein C (gC) were delayed significantly. In Hep2 cells, expression of these proteins failed to reach levels seen in cells infected with Delta U(L)31-R or wild-type HSV-1(F) even after 18 h. The defect in protein accumulation correlated with poor or no activation of NF-kappa B and JNK upon infection with Delta U(L)31 compared to wild-type virus infection. The protein expression defects of the U(L)31 deletion mutant were not explainable by a failure to enter nonpermissive cells and were not complemented in an ICP27-expressing cell line.