Investigation of mechanisms underlying the T-cell response to the hapten 2,4-dinitrochlorobenzene

Pickard, Chris, Smith, Andrew M., Cooper, Hywel, Strickland, Ian, Jackson, John, Healy, Eugene and Friedmann, Peter S. (2007) Investigation of mechanisms underlying the T-cell response to the hapten 2,4-dinitrochlorobenzene Journal of Investigative Dermatology, 127, (3), pp. 630-637. (doi:10.1038/sj.jid.5700581). (PMID:17008874).


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T-cell mediated contact sensitization by small molecular weight xenobiotics results in significant morbidity and absences from work. To be recognized by T-cells, xenobiotics must act as haptens, becoming protein-bound. At present, the requirement for processing and presentation of xenobiotics, the nature of the T-cell responses to them and the mechanisms that confer individual susceptibility in humans are unclear. We have investigated the T-cell response to the hapten 2,4-dinitrochlorobenzene (DNCB) which can sensitize all immunocompetent people. Fourteen healthy adults were sensitized with DNCB; 11 demonstrated positive T-cell responses to the chemical in vitro. Responding cells were of both CD4+ and CD8+ subsets, of Th1 and Tc1 phenotypes, producing high levels of IFN-gamma and low levels of IL-10. DNCB-specific T-cell clones were raised from 2 subjects, which in the presence of fixed and unfixed autologous Epstein-Barr virus transformed B cells as antigen-presenting-cells (APC), demonstrated that the chemical requires metabolic processing by the APC in order to initiate the T-cell response. Intracellular-reduced glutathione is consumed in detoxication of DNCB, leaving residual non-detoxified DNCB free to bind to proteins. The results suggest that DNCB forms multiple haptens with intracellular and extracellular proteins leading to Th1 and Tc1 responses in individuals exposed to this compound.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1038/sj.jid.5700581
ISSNs: 0022-202X (print)
Related URLs:
Organisations: Clinical & Experimental Sciences
ePrint ID: 195519
Date :
Date Event
March 2007Published
Date Deposited: 22 Aug 2011 15:24
Last Modified: 18 Apr 2017 01:38
Further Information:Google Scholar

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