background:
Cytokeratins (CK) are intermediate filaments of epithelial cells, both in keratinising tissue (ie., skin) and non keratinising cells (ie., mesothelial cells). Although not a traditional marker for endothelial cells, cytokeratins have also been found in some microvascular endothelial cells. At least 20 different cytokeratins (CK) in the molecular range of 40 to 70 kDa and isoelectric points of 5 to 8.5 can be identified using two dimensional gel electrophoresis. Biochemically, most members of the CK family fall into one of two classes, type I (acidic polypeptides) and type II (basic polypeptides). At least one member of the acidic family and one member of the basic family is expressed in all epithelial cells. Defects in KRT5 are a cause of epidermolysis bullosa simplex.
Subunit:
Belongs to the intermediate filament family.
DISEASE:
Defects in KRT5 are a cause of epidermolysis bullosa simplex Dowling-Meara type (DM-EBS) [MIM:131760]. DM-EBS is a severe form of intraepidermal epidermolysis bullosa characterized by generalized herpetiform blistering, milia formation, dystrophic nails, and mucous membrane involvement.
Defects in KRT5 are the cause of epidermolysis bullosa simplex with migratory circinate erythema (EBSMCE) [MIM:609352]. EBSMCE is a form of intraepidermal epidermolysis bullosa characterized by unusual migratory circinate erythema. Skin lesions appear from birth primarily on the hands, feet, and legs but spare nails, ocular epithelia and mucosae. Lesions heal with brown pigmentation but no scarring. Electron microscopy findings are distinct from those seen in the DM-EBS, with no evidence of tonofilament clumping.
Database links:
Entrez Gene: 3852 Human
Entrez Gene: 110308 Mouse
Entrez Gene: 369017 Rat
Omim: 29640 Human
SwissProt: P13647 Human
SwissProt: Q922U2 Mouse
SwissProt: Q6P6Q2 Rat
Unigene: 433845 Human
Unigene: 451847 Mouse
Unigene: 129725 Rat
Unigene: 195318 Rat
Important Note:
This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications.
细胞角蛋白5，为高分子量细胞角蛋白 58 kDa ，表达在皮肤的基底细胞和棘层细胞，部分前列腺基底细胞，与其它单层腺上皮不表达。主要用于间皮瘤与腺癌的鉴别诊断。
细胞角蛋白是一类与结构相关的蛋白家族，其在上皮细胞中形成细胞骨架中间丝。CK5是在表皮角质化细胞中大量表达的4种角蛋白之一。CK5可用以区分正常细胞和肿瘤细胞。在基底细胞上皮瘤、多种鳞状细胞癌（皮肤和舌）、多种上皮细胞和间皮瘤都有CK5的表达。
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