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Rogliani P, Amicosante M, Berretta F, Dotti C, Bocchino M, O'Donnell KM, Saltini C. Role of the Hla-Dp Glu 69 and the Tnf-α Tnfa-α2 Gene Markers in Susceptibility to Beryllium Hypersensitivity. Int J Immunopathol Pharmacol 2016; 17:3-10. [PMID: 15345185 DOI: 10.1177/03946320040170s202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Berylliosis is an environmental chronic inflammatory disorder of the lung caused by inhalation of beryllium dusts, characterized by the accumulation of CD4+ T cells and macrophages in the lower respiratory tract. Beryllium presentation to CD4(+) T cells from patients with berylliosis results in T cell activation, and these Be-specific CD4(+) T cells undergo clonal proliferation and Th1-type cytokine production such as interleukin-2, interferon-gamma and tumor necrosis factor-alpha. In exposed workers, genetic susceptibility to this granulomatous disorder is associated with major histocompatibility gene and the TNF-α gene. The HLA-DP glutamic 69 residue was shown to be the MHC genetic marker associated with disease susceptibility; furthermore the TNF-α TNFA-308*2 allele was found to be independently associated with HLA-DP GIu69 in the determination of berylliosis risk.
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Affiliation(s)
- P Rogliani
- Dipartimento di Medicina Interna, Università di Roma Tor Vergata, Rome, Italy
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El Fakhry Y, Bouillon M, Léveillé C, Brunet A, Khalil H, Thibodeau J, Mourad W. Delineation of the HLA-DR Region and the Residues Involved in the Association with the Cytoskeleton. J Biol Chem 2004; 279:18472-80. [PMID: 14976194 DOI: 10.1074/jbc.m401159200] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Whereas the association of major histocompatibility complex (MHC) class II molecules with the cytoskeleton and their recruitment into lipid rafts play a critical role during cognate T/antigen-presenting cell interactions, MHC class II-induced signals, regions, and residues involved in their association and recruitment have not yet been fully deciphered. In this study, we show that oligomerization of HLA-DR molecules induces their association with the cytoskeleton and their recruitment into lipid rafts. The association of oligomerized HLA-DR molecules with the cytoskeleton and their recruitment into lipid rafts occur independently. Furthermore, the association with the cytoskeleton is HLA-DR-specific, since oligomerization of HLA-DP triggers its recruitment only into lipid rafts. HLA-DR molecules devoid of both alpha and beta cytoplasmic tails did not associate with the cytoskeleton, but their recruitment into lipid rafts was unimpeded. Deletion of either the alpha or beta cytoplasmic tail did not affect the association of HLA-DR with the cytoskeleton and/or recruitment into lipid rafts. HLA-DR molecules that were devoid of the alpha cytoplasmic chain and that had their beta cytoplasmic chain replaced with the HLA-DP beta chain or with a beta chain in which the residues at positions Gly(226)-His(227)-Ser(228) were substituted by alanine no longer associated with the cytoskeleton. They were, however, still recruited into lipid rafts. Together, these results support the involvement of different regions of the cytoplasmic tails in the association and the recruitment of HLA-DR into different compartments. The differential behavior of HLA-DP and -DR with respect to their association with the cytoskeleton may explain the previously described difference in their transduced signals.
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Affiliation(s)
- Youssef El Fakhry
- Centre de Recherche en Rhumatologie et Immunologie, Centre Hospitalier de l'Université Laval (CHUL), Département de médecine, Université Laval, Quebec City, Quebec, G1V 4G2 Canada
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3
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Díaz G, Amicosante M, Jaraquemada D, Butler RH, Guillén MV, Sánchez M, Nombela C, Arroyo J. Functional analysis of HLA-DP polymorphism: a crucial role for DPbeta residues 9, 11, 35, 55, 56, 69 and 84-87 in T cell allorecognition and peptide binding. Int Immunol 2003; 15:565-76. [PMID: 12697658 DOI: 10.1093/intimm/dxg057] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The information available on the specific function of HLA-DP and the structure-function relationships is very limited. Here, single amino acid substitutions of HLA-DPB1*02012 have been used to analyze the role of polymorphic residues of the DPbeta1 domain on DP-mediated T cell allorecognition and peptide binding. Using a panel of specific anti-HLA-DP mAb, we identified the HLA-DP residues involved in the recognition by these mAb, with a crucial role for DPbeta56 for most of the mAb assayed. Individual substitutions at residues 9, 11, 35, 55, 56 and 69 completely abrogated T cell recognition mediated by two different HLA-DPw2-allospecific T cell clones (8.3 and 8.9). Interestingly single changes at positions 9, 11, 35 and 55 of HLA-DPbeta also altered the binding of peptides AAII(12-27) and IIP(53-65), natural ligands of the HLA-DPB1*02012 molecule. Individual changes at residues located in pocket 1 (84, 85, 86 and 87 from HLA-DPbeta) led to a partial reduction in cytotoxic T lymphocyte-mediated lysis and also partially affected peptide binding. However, the simultaneous substitution of these positions completely abolished both T cell allorecognition and peptide binding, suggesting a major role for polymorphisms at pocket 1 in HLA-DP function. Molecular modeling, used to predict changes induced by amino acid substitutions, supported the functional data. Taken together, these results strongly suggest that polymorphic residues 84, 85, 86 and 87 at pocket 1, residues 9, 35 and 55 at pocket 9, and residues 11 and 69 at pockets 6 and 4 respectively play a key role in HLA-DP function, probably by modifying the way the peptide is bound within the groove of HLA-DP2 and determining changes in the conformation of the MHC-peptide complex recognized by the TCR.
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Affiliation(s)
- Gema Díaz
- Departamento de Microbiología II, Facultad de Farmacia, Universidad Complutense de Madrid, 28040 Madrid, Spain
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Nimmerjahn F, Milosevic S, Behrends U, Jaffee EM, Pardoll DM, Bornkamm GW, Mautner J. Major histocompatibility complex class II-restricted presentation of a cytosolic antigen by autophagy. Eur J Immunol 2003; 33:1250-9. [PMID: 12731050 DOI: 10.1002/eji.200323730] [Citation(s) in RCA: 240] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Biochemical and functional studies have demonstrated major histocompatibility complex (MHC) class II-restricted presentation of peptides derived from cytosolic proteins, but the underlying processing and presentation pathways have remained elusive. Here we show that endogenous presentation of an epitope derived from the cytosolic protein neomycin phosphotransferase II (NeoR) on MHC class II is mediated by autophagy. This presentation pathway involves the sequestration of NeoR into autophagosomes, and subsequent delivery into the lytic compartment. These results identify endosomes/lysosomes as the processing compartment for cytosolic antigens and furthermore link endogenous antigen presentation on MHC class II with the process of cellular protein turnover by autophagy.
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Affiliation(s)
- Falk Nimmerjahn
- Klinische Kooperationsgruppe, GSF-Institut für Klinische Molekularbiologie, Munich, Germany
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Amicosante M, Berretta F, Franchi A, Rogliani P, Dotti C, Losi M, Dweik R, Saltini C. HLA-DP-unrestricted TNF-alpha release in beryllium-stimulated peripheral blood mononuclear cells. Eur Respir J 2002; 20:1174-8. [PMID: 12449171 DOI: 10.1183/09031936.02.02232001] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Berylliosis is a granulomatous disorder of the lung caused by inhalation of beryllium (Be) and dominated by the accumulation of CD4+ T-helper (Th)1 memory T-cells proliferating in response to Be in the lower respiratory tract. Two gene markers have been associated with susceptibility to berylliosis: 1) the human leucocyte antigen (HLA)-DP gene whose allelic variants, carrying glutamate in position 69 of the beta-chain (HLA-DPGlu69), can bind Be directly and present it to interferon (IFN)-gamma releasing Th1 T-cell clones from patients with berylliosis; and 2) the cytokine gene tumour necrosis factor (TNF)-alpha which has been shown to increase berylliosis risk independent of HLA-DPGlu69. In order to determine whether TNF-alpha release was triggered by Th1 T-cell activation by Be stimulation in the context of HLA-DPGlu69 molecules, the proliferation of BeSO4-stimulated blood mononuclear cells and the release of IFN-gamma, TNF-alpha, RANTES (regulated on activation normal T-cell expressed and secreted), granulocyte-macrophage colony-stimulating factor, interleukin (IL)-4, IL-6, IL-8, IL-10 and IL-12 by BeSO4-stimulated blood mononuclear cells was quantified in 11 individuals with berylliosis using an anti-HLA-DP antibody as a probe for HLA-DP restricted T-cell activation. While proliferation and IFN-gamma release were completely abrogated by HLA-DP inhibition (inhibition with anti-HLA-DP monoclonal antibody (mAb): 88+/-16 and 77+/-16%, respectively; anti-HLA-DR: 29+/-38 and 14+/-10%, respectively), the release of TNF-alpha was not (inhibition with anti-HLA-DP mAb: 8.9+/-7.8%). No other cytokine was detected at significant levels. Moreover, Be was able to induce TNF-alpha production in healthy control subjects not exposed to Be in the absence of T-cell proliferation and IFN-gamma production. In conclusion, these data suggest that the tumour necrosis factor-alpha response of mononuclear cells is independent of the activation of beryllium-specific human leucocyte anitgen-DP restricted T-cells, which is consistent with the finding that the tumour necrosis factorA2 and the human leucocyte anitgen-DPGlu69 genetic markers are independently interacting in increasing berylliosis risk.
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Rihs HP, Chen Z, Ruëff F, Cremer R, Raulf-Heimsoth M, Baur X, Moneret-Vautrin DA, Brüning T. HLA-DQ8 and the HLA-DQ8-DR4 haplotype are positively associated with the hevein-specific IgE immune response in health care workers with latex allergy. J Allergy Clin Immunol 2002; 110:507-14. [PMID: 12209103 DOI: 10.1067/mai.2002.127282] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND Hevein is one of the most important latex allergens affecting health care workers (HCWs). OBJECTIVE Because the genetically determined susceptibility is one important factor regulating type I allergy, the association between the hevein-specific IgE immune response and HLA class II alleles of DQB1 and DRB1, DRB3, DRB4, and DRB5 was studied. METHODS The distribution of HLA-DQB1 and DRB1, DRB3, DRB4, and DRB5 in 269 HCWs with latex allergy, 56 latex-sensitized patients with spina bifida (SB), and 90 nonatopic control subjects under special consideration for hevein-specific IgE was examined. RESULTS Seventy percent (189/269) of the HCWs with latex allergy and 39% (22/56) of the latex-sensitized patients with SB had increased hevein-specific IgE antibody concentrations (>0.35 kU/L). HLA data analysis revealed significantly increased phenotype frequencies for DQB1*0302 (DQ8; 91/189 [48%]) and DRB1*04 (DR4; 102/189 [54%]) in hevein-positive HCWs with latex allergy compared with the 80 hevein-negative HCWs with latex allergy (DQB1*0302: 16/80 [20%], corrected P value [P (c)] = 7.1 x 10(-4); DRB1*04: 23/80 [29%], P (c) =.01) and with control subjects (DQB1*0302: 16/89 [18%], P (c) = 1 x 10(-4); DRB1*04: 22/90 [24%], P (c) = 3.2 x 10(-4)). The DQ8-DR4 haplotype frequency was significantly elevated in HCWs with hevein-specific IgE antibodies when compared with that in HCWs without hevein-specific IgE antibodies (47% vs 18%, P (c) = 5.3 x 10(-4)) or control subjects (47% vs 18%, P (c) = 9.6 x 10(-4)). In contrast, latex-sensitized patients with SB with hevein-specific IgE antibodies showed an increased but not significant DQB1*0302 frequency (7/22 [32%] vs 2/34 [6%], P =.02, P (c) = not significant) compared with that seen in those without hevein-specific IgE antibodies. CONCLUSION The DQB1*0302 (DQ8) alone, the DQB1*0302 (DQ8)-DRB1*04 (DR4) haplotype, or both are significantly involved in the hevein-specific IgE immune response in HCWs with latex allergy.
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Affiliation(s)
- Hans-Peter Rihs
- Research Institute for Occupational Medicine of the Berufsgenossenschaften (BGFA), Institute of the Ruhr-University Bochum, Germany
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7
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Abstract
The highly polymorphic human major histocompatibility complex (HLA) class II molecules are acknowledged as signaling receptors although their coupling to signaling pathways is not yet fully elucidated. In this study, we investigated how HLA class II can be coupled to protein tyrosine kinase (PTK) signaling pathway in B cells and whether there might be differences depending on HLA class II isotype. Using the human B cell line Ramos, we demonstrate that CD19 and CD20 are two HLA class II-associated receptors that couple HLA class II to PTK signaling pathway where CD20 appears to be amajor component of HLA class II-mediated activation of Src kinases. Both HLA-DR and HLA-DP co-immunoprecipitate tyrosine-phosphorylated proteins (p-Tyr) whereas only activation through HLA-DR increases the tyrosine phosphorylation of these proteins. Indeed, in contrast to HLA-DR, cross-linking HLA-DP induces neither tyrosine phosphorylation nor homotypic adhesion, and induces ERK1/2 activation. Differential association of these isotypes with CD20 appears to be one of the mechanisms underlying their differential signaling. We provide an experimental evidence for a mechanism by which HLA class II molecules can be coupled to PTK signaling pathway and, underscores their isotypes differential signaling. Further investigation of these mechanisms is likely to provide new insights into how isotype specific MHC class II signaling can contribute to the regulation of the immune response.
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Affiliation(s)
- Claire Lévéille
- Unité INSERM U396, Institut de Recherches Biomédicales des Cordeliers and Laboratoire d'Immunologie et d'Histocompatibilité, Hôpital Sainte Louis AP-HP, Paris, France
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Matsuoka T, Tabata H, Matsushita S. Monocytes are differentially activated through HLA-DR, -DQ, and -DP molecules via mitogen-activated protein kinases. J Immunol 2001; 166:2202-8. [PMID: 11160273 DOI: 10.4049/jimmunol.166.4.2202] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
When HLA-DR, -DQ, and -DP were cross-linked by solid-phase mAbs, monocytes produced monokines and only anti-DR markedly activated mitogen-activated protein (MAP) kinase extracellular signal-related kinase, whereas anti-DR, anti-DQ, and anti-DP all activated MAP kinase p38. Activation of extracellular signal-related kinase was not inhibited by neutralizing Ab to TNF-alpha. Anti-DR and DR-restricted T cells stimulated monocytes to produce relatively higher levels of proinflammatory monokines, such as IL-1beta, whereas anti-DQ/DP and DQ-/DP-restricted T cells stimulated higher levels of anti-inflammatory monokine IL-10. IL-10 production was abrogated by the p38 inhibitor SB203580, but rather enhanced by the MAP/extracellular signal-related kinase kinase-I-specific inhibitor PD98059, whereas IL-1beta was only partially abrogated by SB203580 and PD98059. Furthermore, DR-restricted T cells established from PBMC, which are reactive with mite Ags, purified protein derivative, and random 19-mer peptides, exhibited a higher IFN-gamma:IL-4 ratio than did DQ- or DP-restricted T cells. These results indicate that HLA-DR, -DQ, and -DP molecules transmit distinct signals to monocytes via MAP kinases and lead to distinct monokine activation patterns, which may affect T cell responses in vivo. Thus, the need for generation of a multigene family of class II MHC seems apparent.
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Affiliation(s)
- T Matsuoka
- Department of Neuroscience and Immunology, Division of Immunogenetics, Kumamoto University Graduate School of Medical Sciences, Honjo, Kumamoto, Japan
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Chang WL, Audet RG, Aizenstein BD, Hogan LH, DeMars RI, Klein BS. T-Cell epitopes and human leukocyte antigen restriction elements of an immunodominant antigen of Blastomyces dermatitidis. Infect Immun 2000; 68:502-10. [PMID: 10639410 PMCID: PMC97169 DOI: 10.1128/iai.68.2.502-510.2000] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Humans infected with the dimorphic fungus Blastomyces dermatitidis develop strong T-lymphocyte responses to WI-1, an immunodominant antigen that has been shown to elicit protective immunity in mice. In the present study, the T-cell epitopes of WI-1 and human leukocyte antigen (HLA) restricting elements that display them were investigated. Peripheral blood mononuclear cells (PBMC) from 37 patients with a confirmed history of blastomycosis were tested for a response to WI-1 in primary proliferation assays; PBMC from 35 (95%) responded. Six patients whose PBMC proliferated strongly in response to WI-1 (defined as a stimulation index greater than 50) were tested further for responses to subcloned, recombinant fragments of the antigen. These patients responded chiefly to sequences within the N terminus and the 25-amino-acid tandem repeat. Cloned CD4(+) T cells from an infected individual were used to delineate more precisely the peptide epitopes in the fragments and HLA restricting elements that present them. A majority of the T-cell clones recognized an epitope spanning amino acids 149 to 172 within the N terminus, displayed by HLA-DR 15. A minority of the clones, which have been shown to perform a cytolytic function in vitro, recognized an epitope in the tandem repeat displayed by HLA-DPw4, an uncommon restricting element. Tandem repeat epitopes required display by the beta chain of DPw4 heterodimers. Thus, human T cells with different functions in vitro also recognize distinct regions of WI-1, raising the possibility that HLA restricting elements that present them could modulate immunity during blastomycosis by selection and display of WI-1 peptides.
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Affiliation(s)
- W L Chang
- Department of Internal Medicine, Louisiana State University Medical School, Shreveport, Louisiana 71103, USA
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Taylor GM, Gokhale DA, Crowther D, Woll PJ, Harris M, Ryder D, Ayres M, Radford JA. Further investigation of the role of HLA-DPB1 in adult Hodgkin's disease (HD) suggests an influence on susceptibility to different HD subtypes. Br J Cancer 1999; 80:1405-11. [PMID: 10424743 PMCID: PMC2363076 DOI: 10.1038/sj.bjc.6690536] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
It has been suggested in a number of studies that susceptibility to adult Hodgkin's disease (HD) is influenced by the HLA class II region, and specifically by alleles at the HLA-DPB1 locus. Since HD is diagnostically complex, it is not clear whether different HLA-DPB1 alleles confer susceptibility to different HD subtypes. To clarify this we have extended a previous study to type DPB1 alleles in 147 adult HD patients from a single centre. We have analysed patients with nodular sclerosing (NS), mixed cellularity (MC) or lymphocyte predominant (LP) HD, and gender in relation to HLA-DPB1 type, in comparison with 183 adult controls. The results confirmed previously reported associations of DPB1*0301 with HD susceptibility (relative risk (RR) = 1.42; 95% confidence interval (CI) 0.86-2.36) and DPB1*0201 with resistance to HD (RR = 0.49; CI 0.27-0.90). However, analysis by HD subtype and gender showed that *0301-associated susceptibility was confined to females with HD (RR = 2.46; CI 1.02-5.92), and *0201-associated resistance to females with NS-HD (RR = 0.28; CI 0.10-0.79). Susceptibility to NS-HD was also associated in females with *1001 (RR = 11.73; CI 1.32-104.36), and resistance with *1101 (RR = 0.08; CI 0.01-0.65). In contrast, susceptibility to LP-HD was associated in males with *2001 (RR = 32.14; CI 3.17-326.17), and to MC-HD with *3401 (RR = 16.78; CI 2.84-99.17). Comparison of DPB1-encoded polymorphic amino-acid frequencies in patients and controls showed that susceptibility to MC-HD was associated with Leucine at position 35 of DPB1 (RR = 8.85; CI 3.04-25.77), Alanine-55 (RR = 15.17; CI 2.00-115.20) and Valine-84 (RR = 15.94; CI 3.55-71.49). In contrast, Glutamic acid 69 was significantly associated with resistance to MC-HD (RR = 0.14; CI 0.03-0.60). Certain DPB1 alleles and individual DPbeta1 polymorphic amino acid residues may thus affect susceptibility and resistance to specific HD subtypes. This may be through their influence on the binding of peptides derived from an HD-associated infectious agent, and the consequent effect on immune responses to the agent.
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Affiliation(s)
- G M Taylor
- Immunogenetics Laboratory, Department of Medical Genetics, St Mary's Hospital, Manchester, UK
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11
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Abstract
HLA-DP molecules function as restriction elements in the presentation of foreign antigens to T cells by antigen presenting cells and certain HLA-DP molecules confer susceptibility to autoimmune disease. Because HLA molecules play an essential role in thymic selection and elimination of autoreactive T lymphocytes, we examined whether human thymic epithelial cells (TEC) expressed HLA-DP molecules. We present evidence that TEC obtained from short time culture express low but significant levels of HLA-DP molecules. The expression of HLA-DP molecules was comparable to or higher than the expression of HLA-DQ but lower than that of HLA-DR. Upon IFN-gamma treatment, HLA-DP expression was strongly upregulated. Since HLA-DQ and DR expression was upregulated in parallel, the hierarchy between MHC class II isotypes remained unchanged following interferon treatment. TEC elicited significant proliferation of HLA-DP allospecific primed lymphocyte typing (PLT) CD4 T cell lines. IFN-gamma treatment strongly upregulated the HLA-DP allospecific PLT responses whereas other PLT responses remained largely unchanged. In conclusion, these data indicate that human thymus epithelial cells express significant levels of functional HLA-DP molecules.
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Affiliation(s)
- A Jørgensen
- Institute of Medical Anatomy, University of Copenhagen, Denmark
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12
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Ploski R, McDowell TL, Symons JA, Flatø B, Duff GW, Thorsby E, Førre O. Interaction between HLA-DR and HLA-DP, and between HLA and interleukin 1 alpha in juvenile rheumatoid arthritis indicates heterogeneity of pathogenic mechanisms of the disease. Hum Immunol 1995; 42:343-7. [PMID: 7558921 DOI: 10.1016/0198-8859(94)00098-b] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
EOP-JRA is an autoimmune disease that displays associations with DPB1*0201, DR8, DR5, and DR6, as well as an association with IL1A2 (a variant of IL1 alpha gene, not HLA linked). The purpose of this study was to analyze interactions between these genetic factors. We studied 103 EOP-JRA patients, 181 random controls, and 69 DR8-positive controls. We found a positive interaction between DPB1*0201 and the DRB1 alleles encoding DR3, DR5, or DR6, but not DR8. In addition, we found evidence for an interaction between IL1A2 and DR(3, 5, or 6) and DP2, but not DR8. We interpret the data to suggest heterogeneity in the HLA-associated pathogenic mechanisms of EOP-JRA.
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Affiliation(s)
- R Ploski
- Institute of Transplantation Immunology, National Hospital, Oslo, Norway
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13
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Higgins JA, Lamb JR, Marsh SG, Tonks S, Hayball JD, Rosen-Bronson S, Bodmer JG, O'Hehir RE. Peptide-induced nonresponsiveness of HLA-DP restricted human T cells reactive with Dermatophagoides spp. (house dust mite). J Allergy Clin Immunol 1992; 90:749-56. [PMID: 1385507 DOI: 10.1016/0091-6749(92)90098-m] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The activation of CD4+ T lymphocytes, which play a central role in allergic inflammation, depends on the recognition of allergen-derived peptides in association with major histocompatibility complex class II gene products. In this report we demonstrate, at a clonal level, that a component of the T-cell repertoire reactive with Dermatophagoides spp. (house dust mite) in atopic individuals, is restricted by HLA-DP class II molecules. This supports the recent results emerging from genetic epidemiologic studies that indicate positive associations between the HLA-DP phenotype and immune responsiveness to a variety of common allergens. Our findings also reveal that the T cells restricted by HLA-DP recognize a species-specific epitope located in the group I allergen of Dermatophagoides pteronyssinus (residues 101-119). Furthermore, we report that the pretreatment of the T cells restricted by HLA-DP with the Der p I peptide renders them nonresponsive to an immunogenic challenge with house dust mite allergen, and the loss of antigen-dependent proliferation is associated with downregulation of membrane expression of the T-cell antigen receptor. The ability to functionally inactivate T cells restricted by HLA-DP, as well as those that recognize allergen in association with HLA-DR class II molecules, suggests that desensitization with allergen-derived peptides may have therapeutic potential in the management of allergic diseases irrespective of their HLA class II association.
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Affiliation(s)
- J A Higgins
- Department of Immunology, St. Mary's Hospital Medical School, Imperial College of Science, London, England
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14
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Abstract
Langerhans cells (LC) are antigen-presenting cells which express high levels of Class II MHC antigens on their plasma membranes. While the expression of these antigens on gingival LC has been documented, their functional significance is unclear. In this study, the mixed epithelial cell-lymphocyte culture reaction (MECLR) between stimulator cells (LC) and allogenic lymphocytes was used as an in vitro model for investigating the role of the MHC Class II antigens HLA-DR, -DQ, and -DP in alloantigen presentation by gingival LC. In epithelial cell suspensions prepared from human gingiva, MHC Class II antigen expression (HLA-DR, -DP, -DQ) was confined to CD1a-positive LC. Depletion of Class II antigen-bearing LC from epithelial cells using monoclonal antibodies (L243, B7/21, and SK10) and complement inhibited the ability of epithelial cells to stimulate proliferation in the MECLR. Pre-treatment of epithelial cell suspensions with the same monoclonal antibodies suppressed proliferation in the MECLR, as did direct addition of these antibodies to co-cultures of epithelial cells and lymphocytes. These results indicate that HLA-DQ and -DP, together with DR antigens on gingival LC, are involved in LC-lymphocyte interactions. Since LC are potent antigen presenting cells, alterations in the expression of MHC Class II antigens on the surface of these cells will influence their ability to stimulate lymphocytes during the initiation of the cellular immune response to the accumulation of dental plaque.
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Affiliation(s)
- L J Walsh
- Department of Social and Preventive Dentistry, University of Queensland Dental School, Brisbane Australia
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15
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Oliver AM, Thomson AW, Sewell HF, Abramovich DR. Major histocompatibility complex (MHC) class II antigen (HLA-DR, DQ, and DP) expression in human fetal endocrine organs and gut. Scand J Immunol 1988; 27:731-7. [PMID: 3293192 DOI: 10.1111/j.1365-3083.1988.tb02407.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Monoclonal antibodies were used to analyse adrenal, pancreas, thyroid, and gut samples from human fetuses (14-19 weeks estimated gestational age; EGA) for the presence of class II major histocompatibility complex (MHC) antigens (HLA-DR, DQ, DP) by immunohistochemistry. In the adrenal definitive and fetal cortex, HLA-DR+, DP-, DQ- cells were clearly demonstrated. These DR+ cells were identified, phentotypically, as predominantly tissue macrophages and a small population of CD45R+, IgM+ lymphoid cells. Within the pancreas, numerous cells throughout the tissue were strongly DR+ but DQ-; DP+ cells were not observed until 17 weeks EGA. Using a double-labelling procedure, minor proportions of these DR+ cells were identified as macrophages or as (CD19+) B cells, while endocrine and endothelial cells were negative. Throughout the thyroid, small numbers of DR+ macrophages and small lymphoid cells were detected, although the thyroid epithelial cells were DR-, DP-, and DQ-. Large numbers of DR+, DP+, DQ- cells were observed in the stomach wall and mucosa. In the intestine, DR+, DP+, DQ+ cells positive for all MHC class II loci products were abundant throughout the lamina propria and lymphoid aggregates. The class II antigens appeared in the proportion DR greater than DP greater than DQ and expression was most prevalent in the mid-gut region. A small proportion of epithelial cells of the villi along the gut were weakly DR+ but DQ-, DP-. These results show that DR+ cells in fetal endocrine tissue are mainly 'passenger leucocytes' and that, in contrast to recent reports concerning normal adult tissue, the adrenal and pancreatic endothelial cells are DR-.
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Affiliation(s)
- A M Oliver
- Department of Pathology, University of Aberdeen, Foresterhill, UK
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Maurer DH, Callaway C, Sorkin S, Pollack MS. Gamma interferon induces detectable serological and functional expression of DR and DP but not DQ antigens on cultured amniotic fluid cells. Tissue Antigens 1988; 31:174-82. [PMID: 3136555 DOI: 10.1111/j.1399-0039.1988.tb02079.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Cultured amniotic fluid cells, which are used for HLA typing studies for the prenatal diagnosis of HLA linked diseases and for prenatal determination of paternity, usually contain mixtures of fibroblastic and epithelioid cells. Cells of both types lack constitutive expression of HLA class II antigens, but these can be induced by pretreatment with gamma interferon. Both serological and functional studies indicate that detectable levels of DR and DP but not DQ antigens can be thereby induced. DR and DP cannot, however, be induced on chorionic villus cells.
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Affiliation(s)
- D H Maurer
- Department of Microbiology and Immunology, Baylor College of Medicine, Methodist Hospital, Houston, Texas
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