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2003 JUL 2 - (NewsRx.com & NewsRx.net) -- by Maria G. Essig, MS, ELS, senior medical writer - Interleukin-2 and interleukin-4 act provide adjuvant activity for herpes simplex virus vaccines, in contrast to interferon-gamma, which does not enhance vaccine potency, according to a report in the Journal of Virology.
"The adjuvant effects of cytokines in humoral and cell-mediated immunity to herpes simplex virus type 1 (HSV-1) have been examined in mice using HSV-1 recombinant viruses expressing murine interleukin-2 (IL-2), IL-4, or gamma interferon (IFN-gamma) gene," reported Yanira Osorio and Homayon Ghiasi at the University of California-Los Angeles.
The researchers immunized BALB/c mice one or three times with control virus or HSV-1 viruses expressing IL-2, Il-4, or IFN-gamma.
"Despite similar replication kinetics, these three recombinant viruses elicited different immune responses to HSV-1 on immunization," stated Osorio and Ghiasi.
The vaccine utilizing IL-4 expression stimulated a stronger antibody response compared to vaccines incorporating the control virus or those expressing IL-2 or IFN-gamma. However, the cytotoxic T lymphocyte response was greater with the IL-2 vaccine compared to the vaccines expressing IL-4 or IFN-gamma.
In vitro experiments using splenocytes from mice immunized with inactivated HSV-1 revealed that a T[subscript]H1 mechanism operated for all of the recombinant virus vaccines.
"As observed for the parental virus, both CD4+ and CD8+ T cells contributed equally to the production of IL-2 by the splenocytes of mice immunized with any of the three recombinant viruses," said the investigators. "However, the pattern ...