Details

Autor(en) / Beteiligte

• Verma, Anil
• Schmidt, Brian A
• Elizaldi, Sonny R
• Nguyen, Nancy K
• Walter, Korey A
• Beck, Zoltan
• Trinh, Hung V
• Dinasarapu, Ashok R
• Lakshmanappa, Yashavanth Shaan
• Rane, Niharika N
• Matyas, Gary R
• Rao, Mangala
• Shen, Xiaoying
• Tomaras, Georgia D
• LaBranche, Celia C
• Reimann, Keith A
• Foehl, David H
• Gach, Johannes S
• thal, Donald N
• Kozlowski, Pamela A
• Amara, Rama R
• Iyer, Smita S

Titel

Impact of Th1 CD4 Follicular Helper T Cell Skewing on Antibody Responses to an HIV-1 Vaccine in Rhesus Macaques

Ist Teil von

• Journal of virology, 2020-02, Vol.94 (6)

Ort / Verlag

1752 N St., N.W., Washington, DC: American Society for Microbiology

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• The results of the RV144 trial demonstrated that vaccination could prevent HIV transmission in humans and that longevity of anti-Env antibodies may be key to this protection. Efforts to improve upon the prime-boost vaccine regimen used in RV144 have indicated that booster immunizations can increase serum anti-Env antibody titers but only transiently. Poor antibody durability hampers efforts to develop an effective HIV-1 vaccine. This study was designed to identify the specific elements involved in the immunological mechanism necessary to produce robust HIV-1-specific antibodies in rhesus macaques. By clearly defining immune-mediated pathways that improve the magnitude and functionality of the anti-HIV-1 antibody response, we will have the foundation necessary for the rational development of an HIV-1 vaccine. Generating durable humoral immunity through vaccination depends upon effective interactions of follicular helper T (T fh ) cells with germinal center (GC) B cells. T h 1 polarization of T fh cells is an important process shaping the success of T fh -GC B cell interactions by influencing costimulatory and cytokine-dependent T fh help to B cells. However, the question remains as to whether adjuvant-dependent modulation of T fh cells enhances HIV-1 vaccine-induced antienvelope (anti-Env) antibody responses. We investigated whether an HIV-1 vaccine platform designed to increase the number of T h 1-polarized T fh cells enhances the magnitude and quality of anti-Env antibodies. Utilizing a novel interferon-induced protein 10 (IP-10)-adjuvanted HIV-1 DNA prime followed by a monophosphoryl lipid A and QS-21 (MPLA+QS-21)-adjuvanted Env protein boost (D IP-10 P ALFQ ) in macaques, we observed higher anti-Env serum IgG titers with greater cross-clade reactivity, specificity for V1V2, and effector functions than in macaques primed with DNA lacking IP-10 and boosted with MPLA-plus-alum-adjuvanted Env protein (DP ALFA ) The D IP-10 P ALFQ vaccine regimen elicited higher anti-Env IgG1 and lower IgG4 antibody levels in serum, showing for the first time that adjuvants can dramatically impact the IgG subclass profile in macaques. The D IP-10 P ALFQ regimen also increased vaginal and rectal IgA antibodies to a greater extent. Within lymph nodes, we observed augmented GC B cell responses and the promotion of T h 1 gene expression profiles in GC T fh cells. The frequency of GC T fh cells correlated with both the magnitude and avidity of anti-Env serum IgG. Together, these data suggest that adjuvant-induced stimulation of T h 1-T fh cells is an effective strategy for enhancing the magnitude and quality of anti-Env antibody responses. IMPORTANCE The results of the RV144 trial demonstrated that vaccination could prevent HIV transmission in humans and that longevity of anti-Env antibodies may be key to this protection. Efforts to improve upon the prime-boost vaccine regimen used in RV144 have indicated that booster immunizations can increase serum anti-Env antibody titers but only transiently. Poor antibody durability hampers efforts to develop an effective HIV-1 vaccine. This study was designed to identify the specific elements involved in the immunological mechanism necessary to produce robust HIV-1-specific antibodies in rhesus macaques. By clearly defining immune-mediated pathways that improve the magnitude and functionality of the anti-HIV-1 antibody response, we will have the foundation necessary for the rational development of an HIV-1 vaccine.