title: Neutralizing activity and cellular immune responses induced in mice after immunization with apoptotic HIV-1/murine leukemia virus infected cells.
abstract: Dendritic cells present microbial antigens to T cells after uptake of apoptotic vesicles from infected cells. We previously reported that immunizations with apoptotic HIV-1/murine leukemia virus (MuLV) infected cells lead to induction of both cellular and humoral immune responses as well as resistance to mucosal challenge with live HIV-1/MuLV infected cells. Here we extended those studies and investigated whether apoptotic cells from HIV-1/MuLV infected cells stimulate the production of HIV-1 neutralizing activity. We compared different routes of administration and were able to induce p24- and Nef-specific cellular proliferation after intraperitoneal (i.p.), intranasal (i.n.), subcutaneous (s.c.) and intramuscular (i.m.) immunizations. Serum IgG and IgA antibodies directed against gp160, p24, or Nef were also produced regardless of immunization route used. However, the induction of mucosa-associated IgAs from faeces or vaginal secretions were detected only after either i.p. or i.n. immunizations. We were able to measure neutralizing activity in sera of mice after i.p. and i.n. immunization. Neutralizing reactivity was also detected after s.c. and i.m. immunizations in the presence of the cytokine adjuvant granulocyte macrophage-colony stimulating factor (GM-CSF). Conclusively we show induction of cellular and humoral immune responses including neutralizing activity after immunization with apoptotic HIV-1/MuLV infected cells in mice. The results from this study support further evaluations using apoptotic cells as antigen delivery system for vaccination against HIV-1 in other animal models.
authors: Microbiology and Tumorbiology Center, Karolinska Institutet, Stockholm, Sweden.
authors: Jorma
authors: J
authors: Hinkula
authors: Lilian
authors: L
authors: Walther-Jallow
authors: Anna
authors: A
authors: Laurén
authors: Barbro
authors: B
authors: Mäkitalo
authors: Monica
authors: M
authors: Oberg
authors: Britta
authors: B
authors: Wahren
authors: Eva-Maria
authors: EM
authors: Fenyö
authors: Anna-Lena
authors: AL
authors: Spetz
mesh_terms: D016915:AIDS Vaccines / Q000008:administration & dosage* / Q000276:immunology; D000818:Animals; D017209:Apoptosis; D002460:Cell Line; D049109:Cell Proliferation; D016207:Cytokines / Q000276:immunology; D004333:Drug Administration Routes; D005260:Female; D015483:HIV Antibodies / Q000097:blood*; D016655:HIV Core Protein p24 / Q000276:immunology; D019302:HIV Envelope Protein gp160 / Q000276:immunology; D015658:HIV Infections / Q000276:immunology / Q000517:prevention & control*; D006801:Humans; D007111:Immunity, Cellular; D056724:Immunity, Humoral; D018928:Immunity, Mucosal; D007070:Immunoglobulin A / Q000097:blood; D007074:Immunoglobulin G / Q000097:blood; D009052:Leukemia Virus, Murine / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D009500:Neutralization Tests; D013154:Spleen / Q000166:cytology / Q000276:immunology; D054311:nef Gene Products, Human Immunodeficiency Virus / Q000276:immunology
chemical_list: D016915:AIDS Vaccines; D016207:Cytokines; D015483:HIV Antibodies; D016655:HIV Core Protein p24; D019302:HIV Envelope Protein gp160; D007070:Immunoglobulin A; D007074:Immunoglobulin G; C514797:gp160 protein, Human immunodeficiency virus 1; D054311:nef Gene Products, Human Immunodeficiency Virus; C514837:nef protein, Human immunodeficiency virus 1; C514799:p24 protein, Human Immunodeficiency Virus Type 1