## Abstract T lymphocytes are stimulated to release Tโcellโreplacing factors in response to Fc fragments of human IgG. Lyt 1^+^23^โ^ T cells are directly triggered to factor production by Fc subfragments, derived from intact Fc fragments by macrophageโdependent enzymatic cleavage. These factor(s) r
Regulation of B lymphocyte activation by the Fc portion of immunoglobulin
โ Scribed by Morgan, Edward L. ;Weigle, William O.
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1980
- Tongue
- English
- Weight
- 439 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0091-7419
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โฆ Synopsis
Abstract
Murine splenic B lymphocytes are induced to proliferate and undergo polyclonal activation in the presence of Fc fragments, AHGG, antigenโantibody complexes, and CH~3~ fragments derived from plasmin digestion of human Ig. The unifying feature of the polyclonal antibody response induced by these agents is that in all cases a portion of the constant region of the Ig molecule (ie, Fc region) is present. Fragments of Ig lacking the Fc piece, such as Fab and F(abโฒ)~2~ were found not to be stimulatory. In addition, a model is proposed to account for the regulatory effects of antigenโantibody complexes on an ongoing humoral immune response.
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