Abstract: 【Abstract】 Objective To culture and identify dermal mesenchymal stem cells （DMSCs） in skin lesions of patients with psoriasis, and to determine the expression of hairy and enhancer of split-1（HES1）and chemokine ligand 6 （CXCL6） in DMSCs. Methods DMSCs were isolated from skin lesions of 15 patients with psoriasis and normal skin tissues of 18 healthy controls, and then subjected to culture. Cell phenotypes were identified by flow cytometry, and mRNA and protein expression of HES1 and CXCL6 was determined by real-time fluorescence-based quantitative PCR （RT-PCR） and Western blot analysis respectively. Comparisons were performed between 2 groups by using t test. Results There was no difference in the morphology of DMSCs between the psoriasis group and control group. The mRNA expression of HES1 and CXCL6 in the psoriasis group was 3.56 and 3.44 times that in the control group respectively, and there was a significant difference between the two groups （both P < 0.05）. The protein expression of HES1 and CXCL6 in DMSCs was significantly higher in the psoriasis group than in the control group （both P < 0.05）. Conclusion The high expression of HES1 and CXCL6 in DMSCs from lesions may be involved in the occurrence of psoriasis.

Key words: Psoriasis, Mesenchymal stem cells, Chemokines, CC, Hairy and enhancer of split 1, CXC motif ligand 6