Defective Integrin α6β4 Expression in the Skin of Patients With Junctional Epidermolysis Bullosa and Pyloric Atresia

Defective Integrin α6β4 Expression in the Skin of Patients With Junctional Epidermolysis Bullosa and Pyloric Atresia
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交界性大疱性表皮松解症和幽门闭锁患者皮肤中整合素α6β4表达缺陷

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发表时间:
1996
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影响因子:
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通讯作者:
W. Carter
W. Carter
中科院分区:
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文献类型:
--
作者:
T. Brown;S. Gil;V. Sybert;G. Lestringant;G. Tadini;R. Caputo;W. Carter

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交界性大疱性表皮松解症(JEB)是一组罕见的遗传性皮肤病,其细胞黏附成分的缺陷导致半桥粒的不完全形成。我们用针对整合素粘着受体α3β1和α6β4以及基底膜配体α3、β3和γ2亚单位层粘连蛋白5的单抗,对10例JEB患者的皮肤进行了免疫组织化学检测。与我们以前的报道一致,只有没有相关幽门闭锁的JEB重症患者的表皮基底膜中层粘连蛋白-5亚单位的表位减少或缺失。相反,3例JEB/PA患者的基底层表皮细胞均显示整合素α6β4表达异常,而层粘连蛋白5未见异常表达。使用识别细胞内和细胞外表位的五种不同的单抗,在这些JEB/PA患者的活检表皮中未检测到整合素β4亚单位。组织提取液的Western印迹分析证实,JEIB/PA标本的表皮中不存在β4亚单位。整合素α6亚单位在JEIB/PA患者表皮中的表达存在差异。整合素α6β4的异常表达可能定义了JEB幽门闭锁的亚群。这些结果强烈地表明,在体内,α6β4在形成完整的半桥粒和基底层角质形成细胞与基底膜的稳定黏附中起着重要的作用。
Junctional epidermolysis bullosa (JEB) is a heterogeneous group of rare inherited skin disorders in which defects in cell adhesion components cause incomplete formation of hemidesmosomes. We have immunohistochemically examined the skin from ten JEB patients (JEB gravis, n = 4; JEB mitis, n = 3; JEB plus pyloric atresia [JEB/PA], n = 3) using monoclonal antibodies specific for the integrin adhesion receptors alpha 3 beta 1 and alpha 6 beta 4, and for the alpha 3, beta 3, and gamma 2 subunits of the basement membrane ligand, laminin 5. Consistent with our previous reports, only the JEB gravis patients without associated pyloric atresia expressed reduced or absent epitopes for laminin-5 subunits in their epidermal basement membrane. In contrast, all three JEB/PA cases showed abnormalities in integrin alpha 6 beta 4, but not in laminin 5, expression in their basal epidermal cells. Integrin beta 4 subunit was undetectable in the biopsied epidermis of these JEB/PA individuals using five different monoclonal antibodies that recognize both intra- and extracellular epitopes. The absence of the beta 4 subunit in the epidermis of JEB/PA specimens was confirmed by Western blot analysis of tissue extracts. Epidermal expression of the integrin alpha 6 subunit was variable in the JEB/PA patients. Abnormal integrin alpha 6 beta 4 expression may define the subset of JEB cases with pyloric atresia. These results strongly implicate a functional role for alpha 6 beta 4 in the formation of complete hemidesmosomes and in stable adhesion of basal keratinocytes to the basement membrane in vivo.
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DOI: --
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