Although cooperative interactions between helper T cells and B-cell precursors have been extensively characterized (1, 2), the role of helper T cells in the triggering and differentiation of cytotexic T-cell precursors remains ambiguous. Several laboratories have described synergistic interactions between T cells recognizing H-2K or D antigens (SD) and T cells recognizing Ia antigens (LD); incr...

Submit Manuscript | http://medcraveonline.com Abbreviations: ADCC: Antibody Dependent Cell Mediated Cytotoxicity; CDC: Complement Dependent Cytotoxicity; CTL: Cytotoxic T lymphocyte; DC: Dendritic Cell; GM-CSF: GranulocyteMacrophage Colony Stimulating Factor; HPV: Human Papilloma Virus; HBV: Hepatitis B Virus; IL-2: Interleukin 2; IL-12: Interleukin 12; IFN: Interferon; MHC: Major Histocompatib...

The cellular basis of the in vitro and in vivo T cell responses to Staphylococcus enterotoxin B (SEB) has been investigated. The proliferation and cytotoxicity of V beta 8.1,2+,CD4+ and CD8+ T cells were observed in in vitro response to SEB. In primary cytotoxicity assays, CD4+ T cells from control spleens were more active than their CD8+ counterparts, however, in cells derived from SEB-primed ...

The cellular basis of the in vitro and in vivo T cell responses to Staphylococcus enterotoxin B (SEB) has been investigated . The proliferation and cytotoxicity of V#8.1,2+,CD4+ and CD8+ T cells were observed in in vitro response to SEB. In primary cytotoxicity assays, CD4+ T cells from control spleens were more active than their CD8+ counterparts, however, in cells derived from SEB-primed mice...

Background: Human peripheral blood NK cells constitutively express CD56 and CD16 antigens. Peripheral blood NK cells seem to be strongly related with decidual NK cells, and may reflect the decidual NK cell functional status. There are varied reports concerning the relationship between NK cell cytotoxicity in women with recurrent spontaneous abortion. Objective: To study NK activity in women wit...

Engagement of the CD3/T cell antigen receptor complex on small, resting T cells is insufficient to trigger cell-mediated cytotoxicity or to induce a proliferative response. In the present study, we have used genetic transfection to demonstrate that interaction of the B7-BB1 B cell activation antigen with the CD28 T cell differentiation antigen costimulates cell-mediated cytotoxicity and prolife...

T cell-mediated immune response against autologous melanoma cells was analyzed, at population and clonal levels, in 31 patients with recurrent and/or metastatic disease. Fresh PBL and lymph node lymphocytes (LNL) from melanoma-involved nodes were not cytotoxic against the respective melanoma cells. When activated in in vitro coculture (IVC) against the autologous melanoma cells in the presence ...

T-2 toxin is a secondary fungal metabolite produced by various species of Fusarium. It is capable of killing cells by causing extensive damage to the cellular membrane. In this study, cytotoxicity of T-2 toxin in combination with different antioxidant materials, including vitamin C (vit. C), vitamin E (vit. E) and selenium (sel) was investigated in vitro using the neutral red cytotoxicity assay...

Formocresol is common treatment in exposed pulp of primary teeth at caries, trauma and damaged with cavity preparation. Although, clinical and radiographic success and good clinical results are observed, dentistry societies are still searching for materials interchangeable with formocresol. Suab1 is a phytochemical agent that was selected because of its anti- bleeding effect. In this study, we ...

Background:  Natural Killer cells express killer inhibitory receptors specific for HLA-class I molecules.  These receptors could induce signals that determine NK cells ability to mediate cytotoxicity.  Purified soluble form of HLA class I molecules (sHLA) could bind to NK cell receptors and down-regulate the NK killer function. Objective:  To evaluate the influence of sHLA and two monoclonal an...