摘要
目的研究胸腺素β4(thymosinβ4,Tβ4)基因片断mRNA在人包皮及其他部位正常皮肤、瘢痕疙瘩、增生性瘢痕组织中的表达,探讨其表达与病理性瘢痕发生的相关性。方法采用地高辛标记Tβ4基因片断[BM005698(EST)基因]探针,利用组织切片的原位杂交技术显示Tβ4 mRNA的表达,分别进行定性和体视学半定量分析4组标本的Tβ4表达情况。结果Tβ4基因片断的mRNA在大部分包皮及其他部位正常皮肤、增生性瘢痕、瘢痕疙瘩中表达,瘢痕疙瘩的成纤维细胞表达Tβ4的阳性标本比率(2/10)仅为包皮(8/10)的25%,为其他部位正常皮肤(7/10)的28.6%,其真皮的表达多于表皮;Tβ4在成纤维细胞、血管内皮细胞、巨噬细胞中表达较多。表达阳性标本真皮的平均光密度值,Tβ4基因片断在瘢痕疙瘩的表达为0.03±0.01,比它在正常皮肤0.09±0.03和增生性瘢痕0.09±0.02的表达分别明显减少(P=0.000;P=0.000);包皮组Tβ4基因表达为0.30±0.08,比其他部位正常皮肤增高231.5%(P<0.001)。4组的积分光密度值分析结果与平均光密度值比较结果基本相同。Tβ4基因在增生性瘢痕组中的表达阳性率(3/10)与包皮外其他部位正常皮肤中的表达差异不显著,但4组的表达量均存在显著差异;Tβ4表达量在包皮组中最高,在其他部位的正常皮肤和增生性瘢痕中次之,瘢痕疙瘩表达最少。结论Tβ4基因片断mRNA在瘢痕和正常皮肤中均有表达。Tβ4基因片断在瘢痕疙瘩中表达减少,在包皮中表达增加,说明Tβ4基因片断可能涉及瘢痕疙瘩形成的病理机制,可能是一个影响瘢痕疙瘩的重要因素。
Objective To investigate the expression of thymosin β4 in the foreskin,normal skin(except the foreskin),hypertrophic scar,and keloid,and its relationship to pathological scars.Methods In situ hybridization was applied to detect the expression of thymosin β4 mRNA [With the probe of BM005698(EST) gene marked by digoxin] in four groups: foreskin,normal skin(except the foreskin),hypertrophic scar,and keloid.Both qualitative and semi-quantitative analysis were performed.Results Thymosin β4 mRNA was expressed in all the four groups.The proportion of thymosin β4 mRNA expression in the keloid was 2/10,which was 25% of that in the foreskin(8/10),and was 28.6% of that in the normal skin(7/10).The positive rate of thymosin β4 mRNA expression in the dermis was higher than that in the epidermis;and was high in fibroblasts,intravascular endothelial cells,and macrophages.The mean OSD of the positive samples was 0.03±0.01 in the keloids,which was significantly lower than that in the normal skins(0.09±0.03) and hypertrophic scars(0.09±0.02)(P=0.000 for both).Compared with the normal skins,the expression increased by 231.5%(P<0.001) in the foreskins(0.30±0.08).The accumulated value of OSD in the four groups was similar to the mean OSD.No significant difference existed in the expression of thymosin β4 mRNA between the normal skins and hypertrophic scars(3/10).However,compared with these two groups,the expression was significantly higher in the foreskins,and significantly lower in the keloids.Conclusions Thymosin β4 mRNA is expressed in both normal skins and scars.The level of expression is decreased in keloids,but is increased in foreskins,indicating that thymosin β4 play a role in keloid formation.
出处
《中国微创外科杂志》
CSCD
2007年第12期1217-1220,共4页
Chinese Journal of Minimally Invasive Surgery
基金
国家自然科学基金资助课题(30170971)
