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Title: Immunogenic peptides comprising a T-helper epitope and a B-cell neutralizing antibody epitope


The present invention relates, generally, to a polyvalent immunogen and, more particularly, to a method of inducing neutralizing antibodies against HIV and to a polyvalent immunogen suitable for use in such a method.

 [1];  [2];  [1]
  1. Durham, NC
  2. Los Alamos, NM
Publication Date:
Research Org.:
University of California; Los Alamos National Laboratory (LANL), Los Alamos, NM
Sponsoring Org.:
OSTI Identifier:
Patent Number(s):
Application Number:
Duke University (Durham, NC); The Regents of the University of Calforinia (Oakland, CA) LANL
DOE Contract Number:
Resource Type:
Country of Publication:
United States

Citation Formats

Haynes, Barton F, Korber, Bette T, and De Lorimier, Robert M. Immunogenic peptides comprising a T-helper epitope and a B-cell neutralizing antibody epitope. United States: N. p., 2006. Web.
Haynes, Barton F, Korber, Bette T, & De Lorimier, Robert M. Immunogenic peptides comprising a T-helper epitope and a B-cell neutralizing antibody epitope. United States.
Haynes, Barton F, Korber, Bette T, and De Lorimier, Robert M. Tue . "Immunogenic peptides comprising a T-helper epitope and a B-cell neutralizing antibody epitope". United States. doi:.
title = {Immunogenic peptides comprising a T-helper epitope and a B-cell neutralizing antibody epitope},
author = {Haynes, Barton F and Korber, Bette T and De Lorimier, Robert M},
abstractNote = {The present invention relates, generally, to a polyvalent immunogen and, more particularly, to a method of inducing neutralizing antibodies against HIV and to a polyvalent immunogen suitable for use in such a method.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 26 00:00:00 EST 2006},
month = {Tue Dec 26 00:00:00 EST 2006}


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  • This study establishes assay systems for helper T cell activities assisting cytotoxic T lymphocyte (CTL) and antibody responses to tumor-associated antigens (TAA) and demonstrates the existence of TAA that induce preferentially anti-TAA CTL helper and B cell helper T cell activities in two syngeneic tumor models. C3H/HeN mice were immunized to the syngeneic X5563 plasmacytoma or MH135 hepatoma. Spleen cells from these mice were tested for anti-TAA helper T cell activity capable of augmenting anti-trinitrophenyl(TNP) CTL and anti-TNP antibody responses from anti-TNP CTL and B cell precursors (responding cells) by stimulation with TNP-modified X5563 or MH134 tumor cells. The resultsmore » demonstrate that cultures of responding cells plus 850R X-irradiated tumor-immunized spleen cells (helper cells) failed to enhance anti-TNP CTL or antibody responses when in vitro stimulation was provided by either unmodified tumor cells or TNP-modified syngeneic spleen cells (TNP-self). In contrast, these cultures resulted in appreciable augmentation of anti-TNP CTL or antibody response when stimulated by TNP-modified tumor cells. The results are discussed in the light of cellular mechanisms underlying the preferential anti-TAA immune responses, and the interrelationship between various types of cell functions including CTL- and B cell-help.« less
  • We have recently demonstrated that a single dose (200 J/m2) of UVB radiation abrogates the capacity of mouse epidermal Langerhans cells (LC) or splenic adherent cells (SAC) to present keyhole limpet hemocyanin (KLH) to Ag-specific, MHC-restricted CD4+ Th1 cells. In the present study we determined whether such Th1 unresponsiveness represented long-lasting immunologic tolerance. To address this question, Th1 were preincubated with KLH-pulsed UVB-LC or UVB-SAC, then isolated and restimulated with unirradiated APC (LC or SAC) plus KLH or with exogenous rIL-2 in the absence of APC. Preincubation with KLH and UVB-LC or UVB-SAC rendered Th1 unresponsive to subsequent restimulation withmore » APC and KLH. In addition, such Th1 were defective in their autocrine IL-2 production, but could respond normally to exogenous rIL-2, indicating that unresponsiveness was due to functional inactivation and not to cell death. Th1 unresponsiveness was Ag-specific, MHC-restricted, and long lasting (greater than 16 days). In addition, it appears that Th1 unresponsiveness is not due to the release of soluble suppressor factors from UVB-LC or UVB-SAC because supernatants from such cells had no effect on Th1 proliferation. Addition of unirradiated allogeneic SAC during preincubation prevented the induction of unresponsiveness by UVB-LC or UVB-SAC, suggesting that UVB interferes with the capacity of LC or SAC to deliver a costimulatory signal(s) that can be provided by allogeneic SAC. We conclude that UVB can convert LC or SAC from immunogenic to tolerogenic APC.« less
  • To study the human host response to viral structural proteins during HTLV type I infection, five synthetic peptides matching the N-terminal and C-terminal regions of HTLV/sub I/ p19 core protein were used to identify antigenic sites on p19 that were immunogenic in man. In radioimmunoassay and immunoprecipitation experiments, antibodies in 16 of 18 HTLV/sub I//sup +/ patient sera reacted with a synthetic peptide matching the C-terminal 11-amino acid sequence of p19, whereas only two sera contained antibodies that reacted with other N- or C-terminal region p19 synthetic peptides. Polyclonal rabbit antisera to N- and C-terminal peptides reacted with a nativemore » viral protein of 19,000 daltons and with gagencoded precursors of p19. Six monoclonal antibodies against native viral p19 were screened for reactivity to the five synthetic peptides. One of six antibodies (13B12) reacted with the C-terminal synthetic peptide of p19. Antibody 13B12 did not react with HTLV/sub II/ or HTLV/sub III/ proteins or with HTLV/sub III/-infected cells, nor did it cross-react with a wide variety of HTLV-uninfected normal host tissues. Thus, the C-terminus of p19 contains an antigen that is highly immunogenic in most HTLV/sub 1/-infected patients and is HTLV/sub I/ specific.« less
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  • The 2L21 epitope of the VP2 protein from the canine parvovirus (CPV), fused to the cholera toxin B subunit (CTB-2L21), was expressed in transgenic tobacco chloroplasts. Mice and rabbits that received protein-enriched leaf extracts by parenteral route produced high titers of anti-2L21 antibodies able to recognize the VP2 protein. Rabbit sera were able to neutralize CPV in an in vitro infection assay with an efficacy similar to the anti-2L21 neutralizing monoclonal antibody 3C9. Anti-2L21 IgG and seric IgA antibodies were elicited when mice were gavaged with a suspension of pulverized tissues from CTB-2L21 transformed plants. Combined immunization (a single parenteralmore » injection followed by oral boosters) shows that oral boosters help to maintain the anti-2L21 IgG response induced after a single injection, whereas parenteral administration of the antigen primes the subsequent oral boosters by promoting the induction of anti-2L21 seric IgA antibodies. Despite the induced humoral response, antibodies elicited by oral delivery did not show neutralizing capacity in the in vitro assay. The high yield of the fusion protein permits the preparation of a high number of vaccine doses from a single plant and makes feasible the oral vaccination using a small amount of crude plant material. However, a big effort has still to be done to enhance the protective efficacy of subunit vaccines by the oral route.« less