A possible mechanism in the recruitment of eosinophils and Th2 cells through CD163(+) M2 macrophages in the lesional skin of eosinophilic cellulitis.
BACKGROUND
M2 macrophages play a critical role in the recruitment of T helper 2 (Th2) regulatory T cells (Treg).


OBJECTIVE
To study the role of M2 macrophages and Treg cells in eosinophilic celulitis.


METHODS
We employed immunohistochemical staining for CD163( )and CD206 (macrophages) as well as FoxP3 (Treg), in lesional skin of four cases of eosinophilic cellulitis.


RESULTS
CD163(+) CD206(+) M2 macrophages, which were previously reported to produce CCL17 to induce Th2 cells and Treg cells, were predominantly infiltrating the subcutaneous tissues and interstitial area of the dermis. M2 macrophages derived from PBMC showed significantly increased expression of CCL11, CCL17, CCL24 and CCL26 mRNA and production of CCL17 and CCL24, when stimulated by IL-4 or IL- 13. In addition, CCL17-producing cells and CCL24-producing cells were prominent in the lesional skin of EC.


CONCLUSIONS
Our study sheds light on one of the possible immunological mechanisms of eosinophilic cellulitis.
Department of Dermatology, Tohoku University Graduate School of Medicine, Seiryo-machi 1-1, Aoba-ku, Sendai, 980-8574, Japan.
Taku
T
Fujimura
Department of Dermatology, Tohoku University Graduate School of Medicine, Seiryo-machi 1-1, Aoba-ku, Sendai, 980-8574, Japan.
Yumi
Y
Kambayashi
Department of Dermatology, Tohoku University Graduate School of Medicine, Seiryo-machi 1-1, Aoba-ku, Sendai, 980-8574, Japan.
Sadanori
S
Furudate
Department of Dermatology, Tohoku University Graduate School of Medicine, Seiryo-machi 1-1, Aoba-ku, Sendai, 980-8574, Japan.
Aya
A
Kakizaki
Department of Dermatology, Tohoku University Graduate School of Medicine, Seiryo-machi 1-1, Aoba-ku, Sendai, 980-8574, Japan.
Setsuya
S
Aiba
D015703:Antigens, CD; D015214:Antigens, Differentiation, Myelomonocytic; D002478:Cells, Cultured; D002481:Cellulitis / Q000276:immunology*; D004802:Eosinophilia / Q000276:immunology*; D004804:Eosinophils / Q000276:immunology*; D006801:Humans; D008264:Macrophages / Q000276:immunology*; D011956:Receptors, Cell Surface; D018418:Th2 Cells / Q000276:immunology*; D000098902:CD163 Antigen
D015703:Antigens, CD; D015214:Antigens, Differentiation, Myelomonocytic; D000098902:CD163 Antigen; D011956:Receptors, Cell Surface
CD163+ CD206+ M2 macrophages; Th2; eosinophilic cellulitis; eosinophils