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Ag-presenting dendritic cells present viral Ags to T cells after uptake of apoptotic bodies derived from virus-infected cells in vitro. However, it is unclear whether apoptotic virus-infected cells are capable of generating immunity in vivo. In this study, we show that inoculation of mice with apoptotic HIV-1/murine leukemia virus (MuLV)-infected cells induces HIV-1-specific immunity. Immunization with apoptotic HIV-1/MuLV-infected syngeneic splenocytes resulted in strong Nef-specific CD8(+) T cell proliferation and p24-induced CD4(+) and CD8(+) T cell proliferation as well as IFN-gamma production. In addition, systemic IgG and IgA as well as mucosa-associated IgA responses were generated. Moreover, mice vaccinated with apoptotic HIV-1/MuLV cells were protected against challenge with live HIV-1/MuLV-infected cells, whereas mice vaccinated with apoptotic noninfected or MuLV-infected splenocytes remained susceptible to HIV-1/MuLV. These data show that i.p. immunization with apoptotic HIV-1-infected cells induces high levels of HIV-1-specific systemic immunity, primes for mucosal immunity, and induces protection against challenge with live HIV-1-infected cells in mice. These findings may have implications for the development of therapeutic and prophylactic HIV-1 vaccines.

Induction of HIV-1-Specific Immunity After Vaccination with Apoptotic HIV-1/Murine Leukemia Virus-Infected Cells