生物谷报道:最近,研究人员在6月出版的《自然—细胞生物学》(Nature Cell Biology)期刊上报告说,一种名为Caspase—14的蛋白质与皮肤抗紫外线损害和水分流失的保护层的形成有关。
Caspase是指(ICE)/CED—3半胱氨酸蛋白酶家族, 目前有14个基因被证实属于Caspase家族, 包括Caspase—1~Caspase—14, 其中人类有11种: Caspase—1~Caspase—10、Caspase—13,而Caspase—11、Caspase—12具有种属特异性, 仅存在于鼠中, Caspase—14是在鼠中被发现的。科学家们早已知道,蛋白质Caspase家族与细胞的程序化死亡和炎症的发生有关,但他们一直没有鉴别出Caspase—14的功能。
利用Caspase—14被敲出的小鼠,Wim Declercq 和同事发现,Caspase—14负责在表皮的上层集中角蛋白和其他蛋白质,形成角质层。角质层是由死亡细胞的残骸形成的平坦层,它们在皮肤上形成一个保护层。对前抗角蛋白微丝聚集蛋白形成抗角蛋白微丝聚集蛋白(Fillagrin)过程的控制,保证了上皮的完整性。缺失Caspase—14的小鼠的皮肤出现了角质层缺陷,这些小鼠更容易出现失水,也更容易受到紫外线损伤。
Figure 1. Histomorphological characterization of caspase-14-deficient epidermis.
(a) Measurement of WEHDamc and DEVDamc cleavage activity in epidermal extracts of wild-type and caspase-14 -/- mice. The error bars represent the mean s.d. of three mice. (b) Macroscopic observation of wild-type and caspase-14 -/- neonate mice. (c) Eosin–haematoxylin staining of skin sections of caspase-14 +/+ and caspase-14 -/- neonatal mice. (d) Scanning electron microscopy of epidermis of caspase-14 +/+ and caspase-14 -/- neonatal mice. (e) Transmission electron microscopy of caspase-14 +/+ and caspase-14 -/- neonate epidermis. Alveolar mottled keratohyalin F-granules are indicated by arrows. Neonates were 3.5–6.5 days old. (f) Confocal microscopy analysis with anti-filaggrin antibody on skin sections of 5.5-day-old mice. The scale bars represent 1 mm in b, 40 m in c, 100 m in d, 1 m in e and 10 m in f.
原文出处:
Caspase-14 protects against epidermal UVB photodamage and water loss
Geertrui Denecker, Esther Hoste, Barbara Gilbert, Tino Hochepied, Petra Ovaere, Saskia Lippens, Caroline Van den Broecke, Petra Van Damme, Katharina D'Herde, Jean-Pierre Hachem, Gaetan Borgonie, Richard B. Presland, Luc Schoonjans, Claude Libert, Joël Vandekerckhove, Kris Gevaert, Peter Vandenabeele, Wim Declercq
Nature Cell Biology 9, 666 - 674 (01 Jun 2007) Letters
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