Dendritic Cell Vaccine
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Data on hepatitis B virus detailed by W.W. Chen and co-authors
2009 MAY 18 - (NewsRx.com) -- "Dendritic cells (DCs) pulsed with HBsAg efficiently reverse the immune tolerance to hepatitis B virus (HBV) and induce HBV-specific cytotoxic T lymphocyte (CTL) responses in transgenic mice and healthy volunteers. However, it is not clear whether HBV core antigen (HBcAg)-pulsed DCs can effectively induce CD4(+) helper T cells polarization into Th1, which contribute to the induction and maintenance of HBV-specific CD8(+) T cells in chronic hepatitis B (CHB) patients," scientists in Beijing, People's Republic of China report. "To address this issue, we conducted this study and investigated whether HBcAg-pulsed DCs could polarize Th1 cells and induce an HBcAg-specific CTL response. HBcAg-pulsed DCs were generated from 21 CHB patients. The capacity of the HBcAg-pulsed DC vaccine to stimulate CD4(+) and CD8(+) T cells to produce IFN-gamma and IL-4 was estimated by intercellular cytokine staining, and the HBcAg-pulsed DCs derived from 10 humam leucocyte antigen (HLA)-A2(+) CHB patients were tested for the induction of HBV-specific CTLs from autologous T cells by pentamer staining. The cytotoxicity of these CTLs was evaluated in vitro by flow cytometry. The HBcAg-pulsed DCs derived from CHB patients exhibited a stronger capacity to stimulate autologous CD4(+) and CD8(+) T cells to release IFN-gamma rather than IL-4, which could induce HBV core 18-27 specific CTLs, suggesting a specific cytotoxicity against T2 cells that had been loaded with the HBV core 18-27 peptide in vitro," wrote W.W. Chen and colleagues. The researchers concluded: "HBcAg-pulsed DC vaccine derived from CHB patients efficiently induced autologous T cell polarization to Th1 and generation of HBV core 18-27 specific CTLs." Chen and colleagues published their study in Hepatology Research (HBcAg-pulsed dendritic cell vaccine induces Th1 polarization and production of hepatitis B virus-specific cytotoxic T lymphocytes. Hepatology Research, 2009;39(4):355-365). For additional information, contact F.S. Wang, Beijing Institute Infectious Disease, Research Center Biology Therapy, 100 Western 4 Ring Rd., Beijing 100039, People's Republic of China. The publisher's contact information for the journal Hepatology Research is: Wiley-Blackwell Publishing, Inc., Commerce Place, 350 Main St., Malden 02148, MA, USA. Keywords: People's Republic of China, Beijing, Antigens, Biotechnology, Chronic Hepatitis B, Gastroenterology, HBV, Hepatitis B Virus, Hepatology, Infectious Disease, Vaccines, Virology. This article was prepared by Hepatitis Weekly editors from staff and other reports. Copyright 2009, Hepatitis Weekly via NewsRx.com.
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