The cellular location of a foreign B cell epitope expressed by recombinant bacteria determines its T cell-independent or T cell-dependent characteristics.

The cellular location of a foreign B cell epitope expressed by recombinant bacteria determines its T cell-independent or T cell-dependent characteristics. Research Abstract Details 

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The cellular location of a foreign B cell epitope expressed by recombinant bacteria determines its T cell-independent or T cell-dependent characteristics. Abstract Text:

C Leclerc,A Charbit,P Martineau,E Deriaud,M Hofnung,

We have targeted two foreign B cell antigenic determinants to different locations in the Escherichia coli cell to examine what effect this had on antibody responses elicited by the recombinant bacteria. The two epitopes were the 132-145 peptide from the PreS2 region of hepatitis B virus and the C3 neutralization epitope of poliovirus type 1. They were each expressed in two forms either on the surface, as part of the outer-membrane protein LamB, or soluble in the periplasm, as part of the periplasmic protein MalE. When live bacteria expressing the foreign epitope at the cell surface were used for immunization of mice, they induced T cell-independent antibody responses characterized by a rapid induction of IgM and IgG antibodies. In contrast, when the same foreign epitope was inserted into the MalE protein, the antibody response was only detectable after 3 wk, belonged only to the IgG class and was strictly T cell dependent. This study has therefore identified two major pathways by which epitopes expressed by bacterial cells can stimulate specific antibody responses. The first pathway is mediated by direct activation of B cells by bacterial cell-surface Ag and does not require T cell help. The second pathway is T cell dependent and concerns Ag that can be released from the bacteria in a soluble form. We have also studied the effect of the exact position of the B cell antigenic determinant within the LamB protein and with respect to the outer membrane by comparing the immunogenicity of the PreS epitope inserted at three different permissive sites of LamB. The data indicated that to obtain an antibody response with intact bacteria, the epitope must be protruding sufficiently from the outside of the outer membrane. In contrast, when semipurified hybrid proteins were used as immunogen, the exact position of the B cell antigenic determinant within solubilized LamB protein does not influence its immunogenicity.

The cellular location of a foreign B cell epitope expressed by recombinant bacteria determines its T cell-independent or T cell-dependent characteristics. Publishing Authors By Initials

C Leclerc,A Charbit,P Martineau,E Deriaud,M Hofnung,

For similar cells: blood cells: leukocytes: leukocytes, mononuclear: lymphocytes: t-lymphocytes: cd4-positive t-lymphocytes: t-lymphocytes, helper-inducer research abstracts see: cells: blood cells: leukocytes: leukocytes, mononuclear: lymphocytes: t-lymphocytes: cd4-positive t-lymphocytes: t-lymphocytes, helper-inducer research

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The cellular location of a foreign B cell epitope expressed by recombinant bacteria determines its T cell-independent or T cell-dependent characteristics. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of immunology (Baltimore, Md. : 1950)

VOLUME: 147

Page Numbers: 3545-52

Journal Abbreviation: J. Immunol.

ISSN: 0022-1767

DAY: 15

MONTH: Nov

YEAR: 1991

The cellular location of a foreign B cell epitope expressed by recombinant bacteria determines its T cell-independent or T cell-dependent characteristics. Information

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LANGUAGE: eng

NlmUniqueID: 2985117

The cellular location of a foreign B cell epitope expressed by recombinant bacteria determines its T cell-independent or T cell-dependent characteristics. Keywords Mesh Terms:

KEYWORDS: T-Lymphocytes, Helper-Inducer

MESH TERMS: immunology

Chemical & Substance for Abstract: The cellular location of a foreign B cell epitope expressed by recombinant bacteria determines its T cell-independent or T cell-dependent characteristics. Information

Substance Name: maltose-binding protein

Registry Number: 0

Grant and Affiliation Information for The cellular location of a foreign B cell epitope expressed by recombinant bacteria determines its T cell-independent or T cell-dependent characteristics.

AFFILIATION: Laboratoire de Biologie des Régulations Immunitaires, Institut Pasteur, Paris, France.

Country: UNITED STATES

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MEDLINETA: J Immunol

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