CCR4 memory CD4+ T lymphocytes are increased in peripheral blood and lesional skin from patients with atopic dermatitis.
BACKGROUND
Recent studies have reported that TH1 and TH2 cells express CXCR3 and CCR4, respectively.


OBJECTIVE
Our goal was to assess the association of CCR4 and CXCR3 expression with TH2 and TH1 cells and association of CCR4 and CXCR3 expression with inflammation in patients with atopic dermatitis (AD).


METHODS
Intracellular cytokine production and chemokine receptor expression in blood T cells were examined by flow cytometry. Immunohistochemical expression of chemokine receptors was also investigated in chronically lesional skin.


RESULTS
CCR4+ and CXCR3+ CD4+ T cells predominantly produced IL-4 and IFN-gamma, respectively. Although the frequency of CXCR3+ cells among CD4+ CD45RO+ T cells was similar for patients with AD (n = 29) and healthy control subjects (n = 19), patients with severe AD (n = 14) had a reduced frequency of CXCR3+ cells. In contrast, the frequency of CCR4+ cells and the CCR4/CXCR3 ratio were higher in patients with AD (n = 22) than healthy control subjects (n = 16) and correlated with disease severity of AD. The frequency of CCR4+ cells correlated positively with eosinophil numbers and serum IgE levels, whereas the frequency of CXCR3+ cells correlated inversely with eosinophil numbers. The frequency of CCR4+ or CXCR3+ cells was similar in patients with psoriasis (n = 6) and healthy control subjects. Immunohistochemical analysis showed that the frequency of CCR4+ cells among CD4+ T cells in chronically lesional skin of patients with AD (n = 9) was higher than that of patients with psoriasis (n = 4).


CONCLUSIONS
Our data suggest the association of CCR4 expression with TH2 cells, the predominance of CCR4+ cells in blood from patients with AD, and an important role of CCR4 in the migration of TH2 cells from blood into AD lesional skin.
Nakatani
T
T
Department of Dermatology, Cancer Research Institute, Kanazawa University School of Medicine, Kanazawa, Japan.
Kaburagi
Y
Y
Shimada
Y
Y
Inaoki
M
M
Takehara
K
K
Mukaida
N
N
Sato
S
S
D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology*; D002465:Cell Movement; D003876:Dermatitis, Atopic / Q000097:blood*; D006801:Humans; D007156:Immunologic Memory; D017493:Leukocyte Common Antigens / Q000032:analysis; D018655:Lymphocyte Count; D054398:Receptors, CCR4; D019707:Receptors, Chemokine / Q000096:biosynthesis* / Q000276:immunology*; D012867:Skin / Q000473:pathology*; D018418:Th2 Cells / Q000166:cytology
C515354:CCR4 protein, human; D054398:Receptors, CCR4; D019707:Receptors, Chemokine; D017493:Leukocyte Common Antigens