• mice show impaired establishment and dysregulated localization of CCR10+ lymphocytes in the skin
• numbers of alpha-beta T cells and percentages of CCR10(EGFP)+ Treg cells, alpha-beta T cells, gamma-delta T cells, and innate lymphoid cells (ILCs) are significantly lower in the skin at 2 weeks of age
• similarly, numbers of alpha-beta T cells and percentages of CCR10(EGFP)+ Treg cells, CD8+ T cells, CD4+ T cells, gamma-delta T cells, and ILCs, are significantly lower in the skin of adult mice
• numbers of CCR10(EGFP)+ CD4+ T cells and CD8+ T cells are significantly reduced in adult skin
• adult mice show a lower percentage of CCR10(EGFP)+ ILCs and T cells localized close to/on the skin hair follicles but a higher percentage localized below hair follicles
• percentages of CCR10(EGFP)+ CD4+ T cells, CD8+ T cells, and ILCs are significantly increased in the blood and spleen of adult mice, suggesting that CCR10+ lymphocytes do not effectively migrate into the skin and instead continue to circulate in the blood and accumulate in the spleen
• percentages of CCR10(EGFP)+ CD4+ and CD8+ alpha-beta T cells are significantly increased in the lungs and uteri of adult mice, whereas frequencies of CCR10(EGFP)+ ILCs and gamma-delta T cells are mildly increased or unchanged in these mucosal tissues
• however, total numbers of skin gamma-delta T cells and ILCs as well as the percentage of CCR10(EGFP)+ gamma-delta T cells in the blood and spleen are not significantly altered