Selective activation of unfolded protein response (UPR) by herpes simplex virus type 1 (HSV-1) in permissive and non permissive cells

The unfolded protein response (UPR) is induced by a variety of external and internal stimuli, including accumulation of misfolded proteins in the endoplasmic reticulum (ER). Viruses such as Herpes Simplex Virus type 1 (HSV-1) induce host cells to produce viral proteins many of which undergo glycosylation and other modifications in the ER, causing stress to the ER and consequently UPR activation. I have tested the hypothesis that HSV-1 has evolved strategies to regulate the UPR in order to suppress aspects of the UPR that might interfere with viral replication and to promote pathways that aid its own survival and replication. The purpose of this study was to test the hypothesis that HSV-1 selectively modulates the three pathways (PERK, ATF6, and IRE-1) of the UPR in epithelial and neuronal cells and to examine the similarities and the differences between these two types of cells in their responses to ER stress. Vero and ONS-76 cells were used as models of epithelial and neuronal cells respectively and qRT PCR technique was used for analyzing RNA levels of transcripts of spliced Xbp1, HERP, CHOP and BIP, selected target genes for three pathways of the UPR. HSV-1 DNA synthesis and infectious virus production in infected cells showed that compared to the permissive Vero cells, ONS-76 cells seemed to be semi-permissive to HSV-1 infection with limited viral DNA synthesis and infectious virus production. The kinetics of transcript and protein synthesis for genes representing immediate early, early and late classes of viral genes was also monitored. Expression of the immediate early gene, ICP0, was similar in both cell types but the expression of the early gene, TK and late genes VP16 and VP 5 was different. My work reveals that HSV-1 infection in cells of epithelial and neuronal origins results in activation of the UPR, but through cell type selective regulation of the three signal transduction pathways of the UPR (PERK, ATF6, and IRE-1). While HSV-1 infection resulted in upregulation of Spliced Xbp1 and its target gene HERP (IRE1 pathway) and downregulation of BIP (ATF6 pathway) in both cell types, CHOP (PERK pathway) was upregulated only in ONS cells. My results suggest that some aspects of the UPR are regulated differently in cells representing the sites for HSV-1 lytic and latent infections. This may indicate the need for increasing the capacity for protein folding and degradation (Xbp1 and ATF6-induced) in both cells but a requirement for suppressing apoptosis (PERK-induced) only in epithelial cells. As well, I show that HSV-1 infection not only selectively activates the UPR pathways in different cell types, but also inactivates some components of the UPR pathways activated by the drug thapsigargin

CREATIVITY IN ORGANIZATIONAL MANAGEMENT AND ITS EFFECT ON THE MELIORATION OF HUMAN POWER’S ACTION

From the beginning of human’s creation, and after birth creativity has been existed, with the continuation of life and with the quick improvement of science, philosophy, and technology. Knowing the simplified agents of organizational evolution, obstacles, and the agents of reinforcement against that can be effective in the correct or principle management, guidance of innovation. Reinforcing the ability of innovation and creativity in organizations can be one of the significant simplified agents in the structure that corresponds to the appointed aim. Achieving the aims of the organization relates to the ability of staffs on duty with the correspondence to the adapted environment. To perform the training and meliorating the human power that causes an increase in their efficiency so that people can continue their activities with the adapted organizational and environmental changes highly systematically. The result indicated that, training and meliorating is a planned and continual struggle by the management in order to improve the capability of staffs and the organizational performance. This article not only expresses the role of human training resources and its significant necessity, also states the relatively common aims of different organizations and systems which are the in-service training and dynamic training of staffs

Effects of cultured shrimp (Litopenaeus vannamei) consumption on serum lipoproteins of healthy normolipidemic men

Background: It has been suggested that moderate shrimp consumption in normolipidemic subjects will not adversely affect the overall lipoprotein profile. Hence, shrimp consumption can be included in &ldquo;healthy heart&quot; nutritional guidelines. However, the effects of cultured shrimp on serum lipoproteins of normal subjects have not yet investigated. Material and Methods: Twenty-five healthy normolipidemic men who were workers of a shrimp farm in Bushehr province participated in a quasi-experimental study. In a crossover six weeks trial, the effect of three days per week diet (containing 300 g cultured shrimp Litopenaeus vannamei /day) on serum lipid profile was compared with a zero-marine baseline diet. Results: After six weeks trial, serum triglyceride and HDL-cholesterol levels were not significantly changed from the baseline levels (p>0.05). However, total cholesterol and LDL-cholesterol levels, total cholesterol to HDL-cholesterol and LDL-cholesterol to HDL-cholesterol ratios were significantly increased (p<0.0001). Conclusion: Moderate cultured shrimp (Litopenaeus vannamei) consumption can increase total cholesterol and LDL-cholesterol levels in normolipidemic men. Although a diet containing native shrimp has many benefits for healthy persons, but we do not recommend cultured shrimp in a healthy heart diet for persons with dyslipidemia or cardiovascular diseases