银屑病角质形成细胞p16基因微卫星杂合性缺失研究

目的探讨银屑病皮损区角质形成细胞p16基因D9S171,D9S1604微卫星位点杂合性缺失(lossofheterozygosity,LOH)与银屑病发病的关系。方法采用聚合酶链反应-变性聚丙烯酰胺凝胶电泳-银染技术对体外原代培养的银屑病皮损区和非皮损区角质形成细胞LOH进行分析。结果23例银屑病患者皮损区体外培养的角质形成细胞在D9S171和D9S1604两个微卫星位点,LOH分别为5例和10例。在非皮损区的相应位点LOH分别为2例和3例。D9S1604LOH频率明显高于非皮损区角质形成细胞(P<0.05);寻常性银屑病患者皮损区角质形成细胞中两位点LOH发生频率分别为23.5%(4/17)和47.1%(8/17),非寻常性银屑病分别为16.7%(1/6)和33.3%(2/6),两型银屑病两位点LOH发生频率相比差异均无显著性(P>0.05)。结论D9S1604微卫星位点LOH与银屑病的发生发展相关,而与临床类型相关无显著性。

Study on Microsatellite DNA Loss of Heterozygosity in p16 Gene of Psoriatic Kerafinocytes

Objectives To detect the loss of heterozygosity(LOH)frequencies of microsatellite loci D9S171and D9S1604in p16gene of psoriatic keratinocytes,and to study the correlation between mi-crosatellite LOH of p16gene and the development of psoriasis.Methods By the use of polymerase chain reaction(PCR)-denaturing polyacrylamide gel electrophoresis-silver staining,LOH was detected with23sam-ples of keratinocytes from psoriatic lesions and non-lesion skin.Results LOH was identified at loci D9S171and D9S1604in5and10out of23keratinocyte samples from LOH-exhibited psoriatic lesions,and in2and3of keratinocyte samples from psoriatic non-lesion skin,respectively.The frequency of LOH at D9S1604was significantly higher in psoriatic lesion samples than that in psoriatic non-lesion skin(P<0.05).The frequencies of LOH at D9S171and D9S1604were23.5%(4/17)and47.1%(8/17)in ker-atinocyte samples from lesions of psoriasis vulgaris,and16.8%(1/6)and33.3%(2/6)in those from other clinical types of psoriasis,respectively.There was no significant difference of LOH frequencies between sam-ples taken from psoriasis vulgaris and other types of psoriasis.Conclusions The frequencies of LOH at the microsatellite locus D9S1604in p16gene are associated with the development of psoriasis.There is no sig-nificant correlation between LOH frequency and clinical types of psoriasis.