scholarly journals Gamma gene rearrangement and expression in autoreactive helper T cells.

1986 ◽  
Vol 163 (5) ◽  
pp. 1314-1318 ◽  
Author(s):  
M Zauderer ◽  
A Iwamoto ◽  
T W Mak
Keyword(s):  
T Cell ◽  
Cell Lines ◽  
Class Ii ◽  
Cytotoxic T Cell ◽  
Specific Class ◽  
Helper T Cell ◽  
Autoreactive T Cell ◽  
Cell Clones ◽  
Class Ii Mhc ◽  
T Cell Lines

gamma gene rearrangements similar to those described for cytotoxic T cell lines are found in L3T4+, autoreactive, or KLH-specific cloned helper T cell lines. High levels of gamma RNA transcripts were, in addition, detected in four out of five L3T4+, class II MHC-specific, autoreactive T cell clones, and in at least one of three KLH-specific, class II MHC-restricted clones. This contrasts with previously reported (9) expression of gamma RNA in only 1 of 11 antigen-specific helper T cell lines.

scholarly journals Antigen recognition by MHC-incompatible cells of a human mismatched chimera.

1988 ◽  
Vol 168 (6) ◽  
pp. 2139-2152 ◽  
Author(s):  
M G Roncarolo ◽  
H Yssel ◽  
J L Touraine ◽  
R Bacchetta ◽  
L Gebuhrer ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
Severe Combined Immunodeficiency ◽  
Class Ii ◽  
Specific Class ◽  
T Cell Clones ◽  
Cell Clones ◽  
Class Ii Mhc ◽  
T Cell Clone ◽  
Hla Phenotype

Tetanus toxin (TT)-specific T cell clones of donor origin were obtained from a patient with severe combined immunodeficiency (SCID) successfully reconstituted by transplantation of allogeneic fetal liver and thymus cells from two different donors performed 10 yr ago. A series of these clones recognized TT in the context of "allo" class II HLA determinants expressed by recipient APC. The restriction element of two T cell clones with the HLA phenotype of the first donor (HLA-DR1,8) and one T cell clone with the HLA phenotype of the second transplant (HLA-DR3,9) was HLA-DR4 of the recipient, whereas other T cell clones derived from the second transplant recognized TT in the context of HLA-DR5 of the recipient's APC. These latter T cell clones were not able to proliferate in response to TT when autologous APC were used. These data demonstrate that recipient and donor cells having different HLA phenotypes could cooperate across the allogeneic barrier and that MHC restriction of antigen (Ag) recognition is independent from the MHC genotype of the T cells but is influenced by the environment in which the T cells mature. We also isolated T cell clones that were able to recognize processed TT presented by all allogeneic EBV cell lines tested, indicating that the Ag specificity of these clones was not restricted by a particular class II MHC molecule. The Ag-specific proliferative response of one of these clones could be blocked by anti-class II MHC mAbs. These results demonstrate that in addition to Ag recognition in the context of specific class II MHC Ags, other types of Ag-specific responses may occur in this human chimera. It is not clear whether this "allo" plus Ag recognition is the result of education of transplanted fetal cells in the host thymus. Taking into consideration our previous findings indicating that alloreactive T cell clones specific for the recipient cells could be isolated in vitro from the PBL of the same patient, our data suggest that the mechanism for deletion of self-reactive clones and the generation of MHC-restricted responses are different.

Herpesvirus-transformed cytotoxic T-cell lines

Nature ◽  
1981 ◽  
Vol 291 (5810) ◽  
pp. 81-83 ◽  
Author(s):  
Donald R. Johnson ◽  
Mikael Jondal
Keyword(s):  
T Cell ◽  
Cell Lines ◽  
Cytotoxic T Cell ◽  
T Cell Lines ◽  
Cytotoxic T Cell Lines

scholarly journals Nonmalignant T cells stimulate growth of T-cell lymphoma cells in the presence of bacterial toxins

Blood ◽  
2006 ◽  
Vol 109 (8) ◽  
pp. 3325-3332 ◽  
Author(s):  
Anders Woetmann ◽  
Paola Lovato ◽  
Karsten W. Eriksen ◽  
Thorbjørn Krejsgaard ◽  
Tord Labuda ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
Cell Lines ◽  
Mhc Class Ii ◽  
Interleukin 2 ◽  
Class Ii ◽  
Bacterial Toxins ◽  
Dependent Manner ◽  
Malignant Cells ◽  
T Cell Lines

AbstractBacterial toxins including staphylococcal enterotoxins (SEs) have been implicated in the pathogenesis of cutaneous T-cell lymphomas (CTCLs). Here, we investigate SE-mediated interactions between nonmalignant T cells and malignant T-cell lines established from skin and blood of CTCL patients. The malignant CTCL cells express MHC class II molecules that are high-affinity receptors for SE. Although treatment with SE has no direct effect on the growth of the malignant CTCL cells, the SE-treated CTCL cells induce vigorous proliferation of the SE-responsive nonmalignant T cells. In turn, the nonmalignant T cells enhance proliferation of the malignant cells in an SE- and MHC class II–dependent manner. Furthermore, SE and, in addition, alloantigen presentation by malignant CTCL cells to irradiated nonmalignant CD4+ T-cell lines also enhance proliferation of the malignant cells. The growth-promoting effect depends on direct cell-cell contact and soluble factors such as interleukin-2. In conclusion, we demonstrate that SE triggers a bidirectional cross talk between nonmalignant T cells and malignant CTCL cells that promotes growth of the malignant cells. This represents a novel mechanism by which infections with SE-producing bacteria may contribute to pathogenesis of CTCL.

scholarly journals Transcription of HLA class II genes in the absence of B-cell-specific octamer-binding factor.

1988 ◽  
Vol 8 (9) ◽  
pp. 3734-3739 ◽  
Author(s):  
E Stimac ◽  
S Lyons ◽  
D Pious
Keyword(s):  
T Cell ◽  
B Cell ◽  
Cell Lines ◽  
B Lymphocyte ◽  
Class Ii ◽  
Cell Mutant ◽  
Barr Virus ◽  
Binding Factor ◽  
Epstein Barr ◽  
T Cell Lines

HLA-DR and other human class II histocompatibility genes are expressed by Epstein-Barr virus-transformed B-lymphocyte cell lines but not by most T-cell leukemia lines. We determined by transcriptional run-on experiments that regulation of class II expression in these cells is at the level of gene transcription; nuclei isolated from B-cell lines actively transcribe class II mRNA, whereas nuclei from non-class II-expressing T-cell lines and from the class II transactive factor-deficient B-cell mutant 6.1.6 do not. In searching for DNA-binding proteins which might regulate transcription, we found both a ubiquitous (B1) and a B-cell-specific (B2) factor which bind to the octamer sequence ATTTGCAT 52 base pairs 5' of the cap site in the DR alpha gene. We examined the relationship of these factors to DR alpha transcription. HUT-78, a T-cell line which expresses class II mRNA constitutively, contains only the ubiquitous B1 octamer-binding factor also found in non-class II-expressing T-cell leukemias. Human fibroblast, HeLa, and melanoma cell lines similarly contain only the ubiquitous factor, even when these cells are induced to express class II mRNA by treatment with gamma interferon. Both B1 and B2 binding factors are present in the B-cell mutant 6.1.6, which nevertheless fails to transcribe class II mRNA. Although we have not ruled out the requirement of B-cell-specific octamer-binding factor B2 for class II expression in B cells, it is clear that in other cells substantial DR alpha transcription occurs in the absence of this factor.

Transcription of HLA class II genes in the absence of B-cell-specific octamer-binding factor

1988 ◽  
Vol 8 (9) ◽  
pp. 3734-3739
Author(s):  
E Stimac ◽  
S Lyons ◽  
D Pious
Keyword(s):  
T Cell ◽  
B Cell ◽  
Cell Lines ◽  
B Lymphocyte ◽  
Class Ii ◽  
Cell Mutant ◽  
Barr Virus ◽  
Binding Factor ◽  
Epstein Barr ◽  
T Cell Lines

HLA-DR and other human class II histocompatibility genes are expressed by Epstein-Barr virus-transformed B-lymphocyte cell lines but not by most T-cell leukemia lines. We determined by transcriptional run-on experiments that regulation of class II expression in these cells is at the level of gene transcription; nuclei isolated from B-cell lines actively transcribe class II mRNA, whereas nuclei from non-class II-expressing T-cell lines and from the class II transactive factor-deficient B-cell mutant 6.1.6 do not. In searching for DNA-binding proteins which might regulate transcription, we found both a ubiquitous (B1) and a B-cell-specific (B2) factor which bind to the octamer sequence ATTTGCAT 52 base pairs 5' of the cap site in the DR alpha gene. We examined the relationship of these factors to DR alpha transcription. HUT-78, a T-cell line which expresses class II mRNA constitutively, contains only the ubiquitous B1 octamer-binding factor also found in non-class II-expressing T-cell leukemias. Human fibroblast, HeLa, and melanoma cell lines similarly contain only the ubiquitous factor, even when these cells are induced to express class II mRNA by treatment with gamma interferon. Both B1 and B2 binding factors are present in the B-cell mutant 6.1.6, which nevertheless fails to transcribe class II mRNA. Although we have not ruled out the requirement of B-cell-specific octamer-binding factor B2 for class II expression in B cells, it is clear that in other cells substantial DR alpha transcription occurs in the absence of this factor.

HLA Class II Positive T Cell Lines Lack Stimulatory Capability in the Mixed Leucocyte Reaction

1989 ◽  
pp. 382-383
Author(s):  
Niels Ødum ◽  
Bo Hofmann ◽  
Niels Morling ◽  
Bodil K. Jakobsen ◽  
Arne Svejgaard
Keyword(s):  
T Cell ◽  
Cell Lines ◽  
Class Ii ◽  
Hla Class Ii ◽  
T Cell Lines
Sign in / Sign up

Export Citation Format

Share Document