The overall goal of this IPCAVD proposal is the development and clinical testing of an Envelope immunogen optimized to elicit broadly neutralizing anti-HIV-1 antibodies. The goal of Project 2 is the preclinical evaluation of HIV-1 Envelope vaccine immunogens that have been optimized to engage the predicted germline precursor B cell receptors of neutralizing antibodies that target the CD4 receptor binding site and begin the process of their development. We hypothesize that one key reason for the failure of previous generations of Envelope immunogens to elicit such antibodies is that these immunogens do not engage germline B cell receptors, the key precursors to broadly neutralizing 'VRCOI '-class antibodies. Thus, previous immunogens did not efficiently initiate and drive the process of 'VRCOI'-class bNAb antibody maturation. In this project we will evaluate germline optimized Env immunogens for their ability to effectively initiate the development of broadly neutralizing anti-CD4-binding site antibodies of the 'VRCOI'-class, and will optimize the vaccine strategies that will be deployed in human clinical trials in Project 4. Utilizing four complementary animal model systems: lentigenic mice, transgenic mice , humanized Veloclmmune mice, and non-human primates, we will evaluate the ability of our immunogens to stimulate germline VH genes known to be the progenitors of 'VRCOr class broadly neutralizing antibodies, trace their maturation over the course of vaccination, and evaluate their ability to block HIV-1 infection. Ultimately, we will determine which optimized Envelope immunogen, and which vaccine modality is the most appropriate for deployment into human clinical trials. A second goal of this Project 2 is to confirm that similar engagement and maturation of germline BCRs that give rise to 'VRC01' class antibodies also takes place in humans immunized with our immunogens. Our studies will provide invaluable information on how well such broadly neutralizing antibodies can be stimulated by germline-optimized Envelope immunogens and how far we are able to drive antibody maturation by vaccination. Such a detailed analysis of vaccine-elicited anti-HIV-1 responses will provide valuable insight for future immunogen and vaccine regimen design efforts.

Public Health Relevance

The goal of this project is the evaluation of HIV-1 Envelope immunogens that have been engineered to overcome a key roadblock in the development of broadly neutralizing antibodies. We will test these immunoens in several biological models and study the stimulation and maturation of relevant B cell receptors in response to vaccination, and will develop a vaccine regimen for human clinical trials. Therefore, our studies are highly relevant to the development of a safe and effective vaccine against HIV-1

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Program--Cooperative Agreements (U19)
Project #
5U19AI109632-08
Application #
9886179
Study Section
Special Emphasis Panel (ZAI1)
Project Start
Project End
Budget Start
2020-03-01
Budget End
2021-02-28
Support Year
8
Fiscal Year
2020
Total Cost
Indirect Cost
Name
Fred Hutchinson Cancer Research Center
Department
Type
DUNS #
078200995
City
Seattle
State
WA
Country
United States
Zip Code
98109
Yacoob, Christina; Lange, Miles Darnell; Cohen, Kristen et al. (2018) B cell clonal lineage alterations upon recombinant HIV-1 envelope immunization of rhesus macaques. PLoS Pathog 14:e1007120
Borst, Andrew J; Weidle, Connor E; Gray, Matthew D et al. (2018) Germline VRC01 antibody recognition of a modified clade C HIV-1 envelope trimer and a glycosylated HIV-1 gp120 core. Elife 7:
Escolano, Amelia; Dosenovic, Pia; Nussenzweig, Michel C (2017) Progress toward active or passive HIV-1 vaccination. J Exp Med 214:3-16
Horwitz, Joshua A; Bar-On, Yotam; Lu, Ching-Lan et al. (2017) Non-neutralizing Antibodies Alter the Course of HIV-1 Infection In Vivo. Cell 170:637-648.e10
Escolano, Amelia; Steichen, Jon M; Dosenovic, Pia et al. (2016) Sequential Immunization Elicits Broadly Neutralizing Anti-HIV-1 Antibodies in Ig Knockin Mice. Cell 166:1445-1458.e12
Yacoob, Christina; Pancera, Marie; Vigdorovich, Vladimir et al. (2016) Differences in Allelic Frequency and CDRH3 Region Limit the Engagement of HIV Env Immunogens by Putative VRC01 Neutralizing Antibody Precursors. Cell Rep 17:1560-1570
McGuire, Andrew T; Gray, Matthew D; Dosenovic, Pia et al. (2016) Specifically modified Env immunogens activate B-cell precursors of broadly neutralizing HIV-1 antibodies in transgenic mice. Nat Commun 7:10618
Tian, Ming; Cheng, Cheng; Chen, Xuejun et al. (2016) Induction of HIV Neutralizing Antibody Lineages in Mice with Diverse Precursor Repertoires. Cell 166:1471-1484.e18
Dosenovic, Pia; von Boehmer, Lotta; Escolano, Amelia et al. (2015) Immunization for HIV-1 Broadly Neutralizing Antibodies in Human Ig Knockin Mice. Cell 161:1505-15
McGuire, Andrew T; Dreyer, Anita M; Carbonetti, Sara et al. (2014) HIV antibodies. Antigen modification regulates competition of broad and narrow neutralizing HIV antibodies. Science 346:1380-1383