KRT17 is a 432-amino acid protein with three domains:
Non-helical head (residues 1–83)
α-helical rod (84–392)
Non-helical tail (393–432).
The KRT17 gene is located on chromosome 17q21.2 and regulates cell proliferation, inflammation, and tumor progression.
Prognostic Significance in Cancer
KRT17 expression correlates with survival outcomes across cancers:
Cancer Type
Prognostic Role of High KRT17
Mechanistic Insights
Source
Laryngeal Squamous Cell Carcinoma (LSCC)
Poor prognosis; drives proliferation via AKT/mTOR and Wnt/β-catenin pathways
Knockdown reduces tumor growth and metastasis
HER2-high Breast Cancer
Favorable prognosis; linked to IL-17 signaling and NK cell infiltration
Low KRT17 predicts poor survival (HR = 2.1)
Colorectal Cancer (dMMR)
Improved immunotherapy response; enhances T-cell infiltration via YTHDF2–CXCL10 axis
Synergizes with anti-PD-1 therapy
Cervical Cancer
Radiotherapy sensitivity biomarker
Overexpression post-radiotherapy correlates with resistance
Immunological Roles
In colorectal cancer, KRT17 degrades YTHDF2, stabilizing CXCL10 mRNA to recruit T-cells and improve anti-PD-1 efficacy.
In HER2-high breast cancer, KRT17 associates with Th17 cell balance and NK cell activity.
Therapeutic Implications
Immunotherapy: KRT17 expression predicts pembrolizumab responsiveness in colorectal cancer.
Targeted Therapy: KRT17 knockdown in LSCC reduces tumor growth by 60% in murine models.
Clinical Utility and Limitations
Strengths: High specificity for epithelial malignancies; actionable biomarker for immunotherapy stratification.
Challenges: Prognostic role varies by cancer subtype (e.g., favorable in HER2-high breast cancer but unfavorable in LSCC).
Product Specs
Buffer
PBS with 0.02% Sodium Azide, 50% Glycerol, pH 7.3. Store at -20°C. Avoid freeze/thaw cycles.
Lead Time
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Synonyms
39.1 antibody; CK 17 antibody; CK-17 antibody; Cytokeratin-17 antibody; K17 antibody; K1C17_HUMAN antibody; Keratin 17 antibody; keratin 17 epitope S1 antibody; keratin 17 epitope S2 antibody; keratin 17 epitope S4 antibody; Keratin 17, type I antibody; Keratin antibody; Keratin type I cytoskeletal 17 antibody; keratin, type i cytoskeletal 17 [version 1] antibody; Keratin-17 antibody; KRT17 antibody; PC antibody; PC2 antibody; PCHC1 antibody; type I cytoskeletal 17 antibody
Keratin 17 (KRT17), a type I keratin, plays a crucial role in the development and maintenance of various skin appendages, particularly in determining hair shape and orientation. It is essential for the proper growth of hair follicles, specifically for sustaining the anagen (growth) phase. KRT17 modulates the activity of tumor necrosis factor-alpha (TNF-alpha) in the context of hair cycling. Through binding to the adaptor protein SFN, KRT17 regulates protein synthesis and epithelial cell growth, further stimulating the Akt/mTOR pathway. This protein is also involved in tissue repair. KRT17 serves as a potential marker for basal cell differentiation in complex epithelia, suggesting its role in a specific type of epithelial 'stem cells'. It functions as a promoter of epithelial proliferation, acting as a regulator of the immune response in the skin. KRT17 promotes a Th1/Th17-dominated immune environment, which contributes to the development of basaloid skin tumors. Furthermore, KRT17 may act as an autoantigen in the immunopathogenesis of psoriasis, with certain peptide regions serving as primary targets for autoreactive T-cells, thus triggering their proliferation.
Gene References Into Functions
A study identified a recurrent mutation in the KRT17 gene within a family exhibiting severe striate palmoplantar keratoderma (SM). This finding strengthens the notion that factors such as modifiers, androgenic stimulation, or environmental influences can shape the phenotypic expression of SM. Additionally, other genetic or proteomic conditions might also contribute to the final manifestations of the disease. PMID: 29218738
Elevated CK17 expression has been linked to lymph node metastasis in oral squamous cell carcinoma. PMID: 30066921
High expression of KRT17 is frequently observed in lung adenocarcinoma tissues. PMID: 29991674
Narrow-band ultraviolet B irradiation has been shown to downregulate K17 expression by inhibiting the ERK1/2 and STAT3 signaling pathways. PMID: 29349514
Research highlights KRT17 as a potential biomarker in gastric cancer, promoting tumor growth, motility, and invasion. These findings suggest that KRT17 could serve as a valuable molecular target for the development of anti-gastric cancer-specific therapies. PMID: 28299464
Studies indicate that CK17, while not specific for differentiated vulvar intraepithelial neoplasia (dVIN), when combined with histological findings, Ki-67, and p53 immunohistochemistry, can be a marker of vulvar dysplasia and aid in the diagnosis of dVIN. PMID: 27513074
Krt17 has been demonstrated to contribute to areca nut-induced oral malignancy. PMID: 27432155
The TGFbeta/SMAD/miR-486-3p signaling axis in keratinocytes regulates K17 expression and cell proliferation. Loss of miR-486-3p in psoriatic epidermis leads to K17 protein overexpression and contributes to the pathogenesis of psoriasis. PMID: 28642156
KRT17 promotes tumor cell growth, at least partially, through its anti-apoptotic effect, resulting from KRT17 overexpression by GLIs in oral squamous cell carcinoma (OSCC). PMID: 28342001
TGF-beta1-induced CK17 enhances cancer stem cell-like properties rather than epithelial-mesenchymal transition in promoting cervical cancer metastasis via the ERK1/2-MZF1 signaling pathway. PMID: 28703907
K17 is highly expressed in most cases of both invasive adenocarcinoma and in AIS and serves as a powerful, negative prognostic marker for patient survival. PMID: 28821199
Research suggests that the loss of Krt17 may foster a protective environment for lesion-prone cervical tissue. PMID: 27065324
High KR17 expression has been associated with oral cancer. PMID: 27512993
K17 is expressed in a subset of triple-negative breast cancers and is a marker of poor prognosis in patients with advanced stage and ER(-)/HER2(-) breast cancer. PMID: 27816721
MiR-138 may regulate K17 protein expression to affect cell proliferation and apoptosis by targeting hTERT gene in keratinocytes from psoriatic vulgaris patients. PMID: 27936398
The pattern of CK17 expression is a highly sensitive marker for distinguishing cutaneous lymphadenoma from basal cell carcinoma in small samples. PMID: 26968559
Cytokeratin 17 immunoexpression might play a role in evaluating surgical borders in some cases of actinic keratosis and Bowen disease. PMID: 26740287
Steatocystoma multiplex is associated with the R94C mutation in the KRTl7 gene, and is reported in a Chinese pedigree. PMID: 26165312
Findings suggest that CK17 is involved in the development and metastasis of papillary thyroid carcinoma. PMID: 26191283
Case Report: polycystic kidney disease with steatocystoma multiplex. PKD1 mutations disrupt keratin 17 polymerization. PMID: 25111597
Data indicate that K17 functions specifically among keratins as an oncoprotein by controlling the ability of p27(KIP1) to influence cervical cancer pathogenesis. PMID: 26109559
Data indicate that autoimmune regulator Aire mRNA transcripts are regulated in a keratin 17 (K17) dependent manner in skin tumor keratinocytes. PMID: 26168014
Research concludes that K17 expression promotes oral squamous cell carcinoma cell growth and cell size but does not affect cell migration. PMID: 25736868
A report on overexpression of keratin 17 in premalignant and malignant squamous lesions of the cervix. PMID: 24051697
A novel heterozygous mutation, p.L91P (c.272T>C) in the helix initiation motif, associated with pachyonychia congenita type 2. PMID: 23855588
Peripheral or diffuse staining for CK17 is a useful marker of invasion in anal squamous neoplastic lesions. PMID: 24335642
KRT17 is necessary for oncogenic transformation in Ewing sarcoma and accounts for much of the GLI1-mediated transformation function, but via a mechanism independent of AKT signaling. PMID: 24043308
Overexpression of keratin 17 is associated with epithelial ovarian cancer. PMID: 23430585
A novel mutation in a Chinese pedigree of pachyonychia congenita type 2 with typical clinical presentations and an autosomal dominant inheritance pattern. PMID: 23278621
A study identified a known mutation in the KRT17 gene in a family with steatocystoma. PMID: 22639854
Keratin-17 expression is correlated with tumor progression in gastric adenocarcinoma and may serve as a biomarker for poor prognosis. PMID: 22695933
IL-22 up-regulates K17 expression in keratinocytes in a dose-dependent manner through STAT3- and ERK1/2-dependent mechanisms. PMID: 22808266
Keratin 17 is a therapeutic target for the treatment of psoriasis [review]. PMID: 22795618
Research observed a higher likelihood of oral leukokeratosis in individuals harboring KRT6A mutations, and a strong association of natal teeth and cysts in carriers of a KRT17 mutation. PMID: 22264670
Data indicate that cytokeratin 17 (CK17) expression could be associated with the differentiation and malignancy of oral squamous cell carcinoma (OSCC). PMID: 22466643
A report on homozygosity for dominant missense mutations in keratin 17 that modify the pachyonychia congenita phenotype. PMID: 22336949
Both moesin and KRT17 demonstrated a tendency of increased expression as pT stage advanced. PMID: 22076435
A novel interaction involving K17 and AnxA2 was identified, identifying AnxA2 as a potential regulator of keratin filaments. PMID: 22235123
Type I keratin 17 protein is phosphorylated on serine 44 by p90 ribosomal protein S6 kinase 1 (RSK1) in a growth- and stress-dependent fashion. PMID: 22006917
Data suggested that IL-17A can upregulate keratin-17 expression in keratinocytes in a dose-dependent manner through STAT1- and STAT3-dependent mechanisms. PMID: 21796151
AIRE expression in HaCaT epidermal keratinocytes, as well as its interaction with K17, was confirmed. PMID: 21356351
KRT17 is upregulated in gastric adenocarcinoma and is associated with tumor progression. PMID: 21443102
Mutation of KRT17 may play a major role in the pathogenesis of this pedigree with pachyonychia congenita type 2. PMID: 21287500
Overexpression of KRT17 is associated with the basal-like phenotype in breast cancer. PMID: 19882246
CK17 expression is significantly higher in thyroid papillary carcinoma than benign thyroid tissue, indicating its potential diagnostic value. PMID: 14761598
Mutation in the second half of the 1A domain of K17 might delay the onset of the clinical phenotype. PMID: 15102078
Epitopes S1 (118-132), S2 (169-183), S4 (323-337), and S4 (348-362) are immunodominant DR B1-restricted T cell epitopes for psoriasis. S1 (118-132) contains the ALEEAN sequence. Other epitopes with different amino acid sequences have not been reported previously. PMID: 15795121
KRT 17 appeared to be the most accurate marker for diagnosing micrometastases of a size greater than 450 µm. PMID: 16638858
Findings showed that, among all cytokeratins, CK17 exhibited the strongest upregulation in oral squamous cell carcinoma compared to normal samples. Overexpression of CK17 was most significantly associated with the diagnosis. PMID: 17786476
The mutation p.M88K is located in the helix initiation motif (HIM) of KRT17. 13 of the 14 reported mutations of KRT17 in pachyonychia congenita type 2 (PC-2) have been mapped to this region. Residue M88 of the HIM is also a mutation hotspot for other keratin disorders (http://www.interfil.org/). PMID: 18547302
Expressed in the outer root sheath and medulla region of hair follicle specifically from eyebrow and beard, digital pulp, nail matrix and nail bed epithelium, mucosal stratified squamous epithelia and in basal cells of oral epithelium, palmoplantar epider
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