Impaired contact hypersensitivity to trinitrochlorobenzene in interleukin-4-deficient mice
Article first published online: 25 DEC 2001
Volume 98, Issue 1, pages 71–79, September 1999
How to Cite
Dieli, Sireci, Scirè, Salerno and Bellavia (1999), Impaired contact hypersensitivity to trinitrochlorobenzene in interleukin-4-deficient mice. Immunology, 98: 71–79. doi: 10.1046/j.1365-2567.1999.00844.x
- Issue published online: 25 DEC 2001
- Article first published online: 25 DEC 2001
We have examined the role of endogenously produced interleukin-4 (IL-4) in the contact hypersensitivity (CH) reaction to the haptene trinitrochlorobenzene (TNCB). The CH reaction was abolished in IL-4 genetically deficient mice (IL-4 KO), when compared to wild-type (wt) mice. The CH reaction was restored by treatment with IL-4 and further analysis revealed that IL-4 exerted its action both at the induction and effector stages of the CH reaction. Despite failure to develop a CH reaction, IL-4 KO mice developed a T helper type 1 (Th1) response to TNCB, in terms of lymphokine production in vitro. Furthermore, the number of Vγ3+ cells accumulating in the lymph nodes of TNCB-immune IL-4 KO mice was normal. The recruitment of mononuclear cells and vascular leakage at the challenge site were consistently reduced in IL-4 KO mice and were restored by injection of IL-4. This suggests that IL-4 acts as a proinflammatory mediator in CH, perhaps favouring the accumulation of mononuclear cells at the site of inflammation. Among Th2-type cytokines, IL-13, but not IL-10, was shown to restore the CH reaction to TNCB in IL-4 KO mice. However, IL-4 KO mice developed a normal CH response to oxazolone, indicating that IL-4 was required for the CH reaction to TNCB, but not for that to oxazolone.