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Expressions of Antimicrobial Peptides LL-37, Human Beta Defensin-2 and -3 in the Lesions of Cutaneous Tuberculosis and tuberculids

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Chinese Medical Journal 2016年第6期129卷 696-701页

作者： Zheng Zhao Zhang-Lei Mu Xi-Wan Liu Xiao-Jing Liu Department of Dermatology Peking University People's Hospital Beijing 100044 China Department of Dermatology Peking University International Hospital Beijing 102206 China

Background： Antimicrobial peptides, including cathelicidin LL-37, human beta defensin （HBD）-2, and HBD-3, are important elements of the innate immune response and involved in modulation of the adaptive immunity, and they also play an important role in cutaneous defense against Mycobacterium tuberculosis. Methods： The fresh skin tissues and paraffin-embedded biopsy samples from three cutaneous tuberculosis, two tuberculids, and ten healthy individuals were collected. The expressions ofLL-37, HBD-2, and HBD-3 mRNA in the lesions of three cutaneous tuberculosis and two tuberculids were detected by quantitative real-time polymerase chain reaction; the protein expressions were detected by immunohistochemistry and Western blotting methods. Results： The expressions of LL-37 mRNA and protein in the lesions of cutaneous tuberculosis and tuberculids were similar to that of normal skin. The expression of HBD-2 mRNA had an increasing trend in the lesions of cutaneous tuberculosis and tuberculids compared with that of normal skin; however, the expression of HBD-2 protein in the lesions of cutaneous tuberculosis had a decreasing trend compared with that of normal skin, and the expression of HBD-2 protein in the lesions of tubereulids was similar to that of normal skin. The expressions of HBD-3 mRNA and protein in lesions of cutaneous tuberculosis and tuberculids were similar to that of normal skin. Conclusions： Our study indicated that the expression of HBD-2 and HBD-3 mRNA and protein in lesions of cutaneous tuberculosis may be not consistent with that of tuberculids. However, an inherent limitation of the present study was that the sample size was small, and the roles and regulation mechanisms ofLL-37, HBD-2, and HBD-3 in cutaneous tuberculosis and tuberculids need to be further investigated.

关键词： Antimicrobial Peptides Cutaneous Tuberculosis Expression Lesions tuberculids

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