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Flow cytometric detection of hepatitis C virus antigens in infected peripheral blood leukocytes: Binding and entry

World Journal of Gastroenterology 2005年第33期11卷 5203-5208页

作者： Mostafa K El-Awady Ashraf A Tabll El-Rashdy M Redwan Samar Youssef Moataza H Omran Fouad Thakeb Maha El-Demellawy Department of Biomedical Technology National Research Center Tahrir Street Dokki Cairo Egypt Genetic Engineering and Biotechnology Research Institute New Borg El-Arab City Alexandria Egypt Department of Gastroenterology-Hepatology Faculty of Medicine Cairo University Egypt Genetic Engineering and Biotechnology Research Institute New Borg El-Arab City Alexandria Egypt

AIM： We designed two synthetic-core-specific peptides core 1 （C1） and core 2 （C2）, and an E1-specific peptide （El）. We produced specific polyclonal antibodies against these peptides and used the antibodies for detection of HCV antigens on surface and within infected peripheral blood leukocytes. METHODS： peripheral blood from a healthy individual who tested negative for HCV RNA was incubated with HCV type 4 infected serum for i h and 24 h at 37 ℃. cells were stained by direct and indirect immunofluorescence and measured by flow cytometry. RESULTS： After 1 h of incubation, antibodies against C1, C2, and El detected HCV antigens on the surface of 27%, 26% and 73% of monocytes respectively, while 10%, 5% and 9% of lymphocytes were positive with anti-C1, anti-C2 and anti-E1 respectively. Only 1-3% of granulocytes showed positive staining with anti-C1, anti-C2 and anti E1 antibodies. After 24 h of incubation, we found no surface staining with anti-C1, anti-C2 or anti-E1. Direct immunostaining using anti-C2 could not detect intracellular HCV antigens, after 1 h of incubation with the virus, while after 24 h of incubation, 28% of infected cells showed positive staining. Only plus strand RNA was detectable intracellularly as early as 1 h after incubation, and remained detectable throughout 48 h post-infection. Interestingly, minus RNA strand could not be detected after 1 h, but became strongly detectable intracellularly after 24 h post-infection. CONCLUSION： Monocytes and lymphocytes are the preferred target cells for HCV infection in peripheral blood leukocytes. Our specific anti-core and anti-E1 antibodies are valuable reagents for demonstration of HCV cell cycle. Also, HCV is capable of infecting and replicating in peripheral blood mononuclear cells as confirmed by detection of minus strand HCV RNA as well as intracellular staining of core HCV antigen.

关键词： Flow cytometry Hepatitis C virus Envelope Core Antibodies Indirect immunofluorescence Minus and plus RNA strand peripheral blood mononudear cells

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