We have investigated the ability of an Ia-, nonantigen-presenting macrophage tumor cell line, P388D, (H-2d), to present antigen to T cell hybridomas after incubation in a lymphokine-containing preparation. P388D, cells were incubated in microtiter wells with various concentrations of Con A-stimulated spleen cell supernatants. Antigen-specific stimulation of H-2d-restricted, KLH-specific T cell ...

It has been established that at least some V beta 17+ T cells interact with an endogenous superantigen encoded by the murine retrovirus, Mtv-9. To analyze the role of major histocompatibility complex (MHC) class II molecules in presenting the Mtv-9 encoded superantigen, vSAG-9 to V beta 17+ hybridomas, a panel of nine hybridomas was tested for their ability to respond to A20/2J (H-2d) and LBK (...

T cell hybridoma lines were constructed by fusion of DBA/2 alloantigen-activated T cell blasts with the AKR thymoma line BW5147. Certain of the hybridomas prepared in this manner secreted spontaneously into their culture supernates biologically active molecules that displayed B cell- and T cell-activating properties characteristic of allogeneic effect factor (AEF). Cell surface phenotype analys...

The current study was to prepare a mouse-derived antibody against the angiotensin II type 1 receptor (AT1-mAb) based on monoclonal antibody technology, to provide a foundation for research on AT1-AA-positive diseases. Balb/C mice were actively immunized with the second extracellular loop of the angiotensin II type 1 receptor (AT1R-ECII). Then, mouse spleen lymphocytes were fused with myeloma ce...

Monoclonal antibodies (MoAbs) to antigens of human small cell lung cancer (SCLC) and non-small cell lung cancer (NSCLC) were produced from BALB/c mice immunized with either intact cultured cells or mem brane preparations from cultured tumor cells. Of 172 MoAbs produced from two NSCLC immunized mice and reactive to NSCLC cells, 137 bound staphylococcal Protein A directly, and only 11 of these 17...

background: pan-igg specific monoclonal antibodies (mabs) are essential tools for assessment of humoral immunity, immune deficiency and gammopathy. in this study, four hybridoma clones producing mabs with different specificities for human igg isotypes were established. methods: splenocytes from balb/c mice immunized with fc fractions of human igg were fused with sp2/0 myeloma cells. hybridoma c...

Two low metastatic clones, NL-14 and NL-44, had been isolated from the murine colon 26 adenocarcinoma after in vivo selection and subsequent in vitro cloning. NL-14 is defective in the ability to induce platelet aggregation, but it has good in vivo growth potential. NL-44 possesses low growth potential after s.c. inoculation, but it has strong platelet-aggregating ability. A ouabain-resistant v...

A T-cell-derived lymphokine was identified by its ability to support the growth of a subset of B-cell hybridomas. Hybrids that failed to survive in the absence of this molecule represented a major proportion of rat-mouse hybridomas but were very rare among mouse-mouse B-cell hybrids. Stable factor-dependent B-cell hybridomas were used to monitor the purification of the growth factor from the su...

A predominant T-cell epitope of Escherichia coli outer membrane protein F (OmpF) that encompasses amino acids 295 to 314 was identified in H-2(d) mice. BALB/c-derived T-cell hybridomas generated against this region were CD3(+), CD4(+), CD8(-), and T-cell receptor alphabeta(+) and secreted TH-1-associated cytokines (interleukin-2 [IL-2] and gamma interferon), but not a TH-2-associated cytokine (...

Engagement of T-cell receptors (TCRs) on immature thymocytes by self-antigen-major histocompatibility complexes causes the death of self-reactive thymocytes via apoptosis, a phenomenon that establishes T-cell tolerance. Similarly, treatment of thymocytes with anti-TCR antibodies leads to TCR-mediated apoptosis, which can also be induced in T-cell hybridomas. TCR-mediated apoptosis in immature t...