Expression of the T-helper 2-specific chemokine receptor CCR4 on CCR10-positive lymphocytes in atopic dermatitis skin but not in psoriasis skin - PubMed (original) (raw)
Expression of the T-helper 2-specific chemokine receptor CCR4 on CCR10-positive lymphocytes in atopic dermatitis skin but not in psoriasis skin
C Vestergaard et al. Br J Dermatol. 2003 Sep.
Abstract
Background: Atopic dermatitis (AD) and psoriasis are inflammatory skin diseases. AD is generally perceived as a T-helper (Th) 2-dominated disease whereas psoriasis is a Th1-dominated disease. The chemokine cutaneous T-cell attracting chemokine (CTACK) and its receptor CCR10 attract skin-homing lymphocytes to inflamed skin, suggesting that CCR10+ cells in AD and psoriasis should be of Th2 and Th1 type, respectively. The chemokine receptor CCR4 is expressed selectively on Th2 lymphocytes and its ligand thymus and activation-regulated chemokine (TARC) is upregulated in AD lesions, suggesting that the CCR10+ cells in AD lesions should also express CCR4.
Objectives: To examine the coexpression of CCR10 and CCR4 on skin-invading lymphocytes in AD and psoriasis lesions as well as the Th1/Th2 cytokine expression of the CCR10+ lymphocytes.
Methods: Skin biopsies from AD and psoriasis patients were double stained with antibodies against CCR10-CCR4, CCR10-CCR5, CCR10-interleukin (IL)-2 and CCR10-IL-4.
Results: The CCR10+ cells in AD showed a mixed IL-2/IL-4 expression pattern, and a minor proportion expressed CCR4, whereas a large proportion of the CCR4+ cells did not express CCR10. In psoriasis the CCR10+ cells only expressed IL-2, and no CCR4 expression was detected.
Conclusions: The CCR10+ lymphocytes invading the skin in AD and psoriasis have different Th1/Th2 profiles, as measured by both their cytokine and chemokine receptor expression. This suggests that the CCR10+ subpopulation of lymphocytes is made up of different Th1/Th2 subsets. However, the Th1/Th2 lymphocytes of AD and psoriasis were either CCR10+ or CCR10-, suggesting that both the Th1 and Th2 subpopulation can be subdivided further. CCR4 was found only in AD skin and on both CCR10+ and CCR10- cells, supporting the hypothesis of TARC and CTACK as being independent lymphocyte-attracting chemokines in AD.
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