Keratin 9 is required for the structural integrity and terminal differentiation of the palmoplantar epidermis.

Keratin 9 is required for the structural integrity and terminal differentiation of the palmoplantar epidermis.
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DOI:
10.1038/jid.2013.356
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发表时间:
2014-03
影响因子:
6.5
通讯作者:
Pedrioli, Deena M. Leslie
Pedrioli, Deena M. Leslie
中科院分区:
医学1区
文献类型:
--
作者:
Fu, Dun Jack;Thomson, Calum;Lunny, Declan P.;Dopping-Hepenstal, Patricia J.;McGrath, John A.;Smith, Frances J. D.;McLean, W. H. Irwin;Pedrioli, Deena M. Leslie

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角蛋白9(K9)是一种I型中间丝蛋白,其表达仅限于掌跖表皮的基底上层。虽然已知K9基因突变会引起表皮增生性掌跖角化病(一种罕见的显性阴性皮肤病),但对其功能意义了解甚少。为了深入了解K9的生理需求和重要性,我们产生了K9缺陷(Krt 9 −/−)小鼠。在这里,我们报告说,成年Krt 9 −/−小鼠发展出以色素沉着过度为标志的老茧,这些老茧只局限于承受压力的脚垫。这些区域的组织学、免疫组织化学和免疫印迹分析显示过度增殖、终末分化受损和角蛋白K5、K14和K2的异常表达。此外,K9的缺乏诱导应激活化的角蛋白K6和K16。重要的是,K9-null等位基因(Krt 9 +/−)杂合的小鼠既没有表现出明显的表型,也没有表现出组织学表型,表明一个Krt 9等位基因足以发育正常的掌跖表皮。总之,我们的数据表明,K9的完全消融在体内是不可容忍的,K9是终末分化和维持掌跖表皮的机械完整性所必需的。
Keratin 9 (K9) is a type I intermediate filament protein whose expression is confined to the suprabasal layers of the palmoplantar epidermis. Although mutations in the K9 gene are known to cause epidermolytic palmoplantar keratoderma, a rare dominant-negative skin disorder, its functional significance is poorly understood. To gain insight into the physical requirement and importance of K9, we generated K9-deficient (Krt9−/−) mice. Here, we report that adult Krt9−/−mice develop calluses marked by hyperpigmentation that are exclusively localized to the stress-bearing footpads. Histological, immunohistochemical, and immunoblot analyses of these regions revealed hyperproliferation, impaired terminal differentiation, and abnormal expression of keratins K5, K14, and K2. Furthermore, the absence of K9 induces the stress-activated keratins K6 and K16. Importantly, mice heterozygous for the K9-null allele (Krt9+/−) show neither an overt nor histological phenotype, demonstrating that one Krt9 allele is sufficient for the developing normal palmoplantar epidermis. Together, our data demonstrate that complete ablation of K9 is not tolerable in vivo and that K9 is required for terminal differentiation and maintaining the mechanical integrity of palmoplantar epidermis.
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