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2003 AUG 20 - (NewsRx.com & NewsRx.net) -- by Maria G. Essig, MS, ELS, senior medical writer - The delivery method and the animal model used affect the T helper cytokine immune response to Japanese encephalitis virus inoculation in mice.
"T helper cytokine and IgG subtype responses were studied in three strains of mice (C57BL/6J, Swiss albino, BALB/c; n=90 per strain) immunized with live Japanese encephalitis virus (JEV) by intraperitoneal (IP), subcutaneous (SC), and peroral (PO) routes," reported C. Ramakrishna and colleagues at the National Institute of Mental Health and Neurosciences in Bangalore, India.
The researchers determined the release of the cytokines interleukin 4 (IL-4) and interferon gamma (IFN-gamma) released by lymphocytes harvested from the spleens of immunized and control mice and stimulated with JEV. The levels of IgG antibodies specific for JEV also were measured in the plasma of immunized mice.
Th1 responses were more consistent and significantly greater in C57BL/6J and BALB/c mice than in the outbred Swiss albino mice (p
The initial response was Th2, which reverted to a Th1 response upon additional immunizations. Interestingly, inoculation with live virus generated mainly a Th1 response while killed virus used in commercial vaccines elicited a Th2 response.
"T helper cytokine responses in mice immunized with JEV were found to be strain- and ...
Source: HighBeam Research, Delivery and animal model affects immune response to Japanese...