Immunization with HIV-1 SF162-derived Envelope gp140 proteins does not protect macaques from heterologous simian-human immunodeficiency virus SHIV89.6P infection.
Immunization by the SF162gp140 or the DeltaV2gp140 HIV-1 envelope proteins results in the generation of strong homologous neutralizing antibodies (NAbs) that offer similar degree of protection from disease-development to macaques challenged with homologous virus. These two immunogens elicit weak cross-reactive NAbs and their effectiveness against heterologous challenge is currently unknown. To examine this issue, we immunized macaques with SIVGag p55 and either the SF162gp140 or the DeltaV2gp140 and challenged them intravenously with SHIV-89.6P. All animals became infected but previous immunization with SF162gp140 accelerated the development of anti-SHIV89.6P neutralizing antibody responses following infection. DeltaV2gp140 is derived from SF162gp140 following the deletion of 30 amino acids and one N-linked glycosylation site from the V2 loop. Our results suggest that even small differences in HIV Envelope immunogen structure can affect the neutralizing antibody responses generated following infection.
Xu
Rong
R
Seattle Biomedical Research Institute, Seattle, WA 98109, USA.
Srivastava
Indresh K
IK
Kuller
Larene
L
Zarkikh
Irina
I
Kraft
Zane
Z
Fagrouch
Zahra
Z
Letvin
Norman L
NL
Heeney
Jonathan L
JL
Barnett
Susan W
SW
Stamatatos
Leonidas
L
D016915:AIDS Vaccines / Q000008:administration & dosage / Q000276:immunology*; D000818:Animals; D018791:CD4 Lymphocyte Count; D004195:Disease Models, Animal; D004797:Enzyme-Linked Immunosorbent Assay; D015686:Gene Products, env / Q000235:genetics / Q000276:immunology*; D015483:HIV Antibodies / Q000097:blood; D015658:HIV Infections / Q000276:immunology / Q000517:prevention & control* / Q000821:virology; D015497:HIV-1 / Q000276:immunology* / Q000502:physiology; D007371:Interferon-gamma / Q000096:biosynthesis; D007963:Leukocytes, Mononuclear / Q000276:immunology; D008253:Macaca mulatta; D009500:Neutralization Tests; D012367:RNA, Viral / Q000097:blood; D018449:SAIDS Vaccines / Q000008:administration & dosage / Q000276:immunology*; D016097:Simian Acquired Immunodeficiency Syndrome / Q000276:immunology / Q000517:prevention & control* / Q000821:virology; D015302:Simian Immunodeficiency Virus / Q000276:immunology; D022223:Vaccines, Subunit / Q000008:administration & dosage / Q000276:immunology; D019562:Viral Load; D054299:env Gene Products, Human Immunodeficiency Virus
D016915:AIDS Vaccines; D015686:Gene Products, env; D015483:HIV Antibodies; D012367:RNA, Viral; D018449:SAIDS Vaccines; D022223:Vaccines, Subunit; D054299:env Gene Products, Human Immunodeficiency Virus; C097729:gp140 envelope protein, Human immunodeficiency virus 1; D007371:Interferon-gamma