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J. Med. Virol. 84:336�C344, 2012. ? 2011 Wiley Periodicals, Inc. ""Hepatitis B virus (HBV) infection can result in fatal liver diseases, including cirrhosis or liver failure, and its replication and pathogenesis depend on the critical interplay between viral and host factors. This study investigated HBV replication-related host proteins and the effect of candidate proteins on HBV replication. Isobaric tags for relative and absolute quantitation (iTRAQ) were used to measure HBV replication-related proteins in HepG2 cells and HepG2.2.15 cells. KRT8 was up-regulated Quetiapine in HepG2.2.15 cells but not in HepG2 cells, and KRT8 was overexpressed in an HBV-infected patient's liver tissue. This result AG-014699 cell line suggested that KRT8 is involved in HBV replication. To further clarify the relationship between KRT8 and HBV replication, KRT8 gene expression was inhibited by siRNA. The silencing of KRT8 mildly suppressed HBV replication. Moreover, overexpressed KRT8 significantly increased HBV replication, and the inhibition of HBV DNA did not suppress KRT8 expression. Thus, the host protein KRT8 is involved in the replication of HBV DNA, and it dramatically enhances HBV replication. J. Med. Virol. 86:687�C694, 2014. ? 2013 Wiley Periodicals, Inc. ""This study aimed at understanding the HIV prevalence, distribution of HIV risk factors and whether the HIV has spread from high-risk groups to the general population in the Yanyuan and Muli counties, Liangshan Prefecture, Sichuan Province, LDK378 clinical trial China. A multistage probability method was used to select a representative sample of villages in each county, with stratification by risk employed in the sampling for the Yanyuan county. A real-name registration and confidential method were adopted to collect the information of the participants. Blood specimens were tested for HIV, syphilis, and hepatitis C virus. A total of 4,950 subjects participated in the study. Of the participants aged?��?15 years, 0.12% self-reported being drug users and 40% were injection drug users; 0.46% had multiple sex partners and the condom use rate was only 26.3% during the last sexual intercourse. HIV, syphilis, and HCV prevalence of Yanyuan county were 0.06% (95% CI: 0�C0.142), 0.06% (95% CI: 0�C0.142), and 0.15% (95% CI: 0.020�C0.280), respectively. HCV prevalence of Muli county was 0.06% (95% CI: 0�C0.191), and none was found to be HIV or syphilis positive. Therefore, the rate of HIV infection in Yanyuan and Muli counties is at a low level currently. The Yanyuan county HIV infection rate is similar to the average rate in all of China, and the Muli county rate is below China's average. The HIV epidemic has not spread from high-risk groups to the general population in these two counties. J. Med. Virol. 84:1�C5, 2011. ? 2011 Wiley Periodicals, Inc.