title: Antigen-specific helper factor production by immortalized clone of OVA-specific T cells. I. In vitro activity.
abstract: Immortalized clones of virally transformed OVA-specific T cells produce antigen-specific helper factor upon stimulation in vitro. The helper factor activate DNP-primed B cells to multiply and synthesize IgG anti-DNP antibodies. The trigger of the helper clone is antigen specific and the B cell-stimulating hapten must be coupled to the specific T cell carrier in order to transfer the help signal from the activated T clone to the B lymphocytes. Activation of the helper clone is performed by antigen-pulsed macrophages and cannot be achieved by the free soluble antigen. However, cell-free supernatant of the antigen-pulsed macrophages can stimulate the helper cells. Thus the antigenic determinant must be presented to the helper cell in the form of macrophage-processed antigen. These requirements for antigenic stimulation and the activity of the secreted helper factor demonstrate that the immortalized helper clone preserved the cellular components which control the antigen-specific immune function of the normal T lymphocyte.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D000938:Antigen-Presenting Cells / Q000276:immunology; D002999:Clone Cells / Q000276:immunology; D005260:Female; D007376:Interleukin-2 / Q000096:biosynthesis*; D008211:Lymphocyte Cooperation; D008264:Macrophages / Q000276:immunology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D010047:Ovalbumin / Q000276:immunology; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*
chemical_list: D007376:Interleukin-2; D010047:Ovalbumin