KRT17 Antibody

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Description

Definition and Structure of KRT17

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 TypePrognostic Role of High KRT17Mechanistic InsightsSource
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 CancerFavorable 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 CancerRadiotherapy 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
Typically, we can ship your order within 1-3 business days of receiving it. Delivery times may vary depending on the purchasing method or location. Please consult your local distributors for specific delivery details.
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
Target Names
Uniprot No.

Target Background

Function
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
  1. 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
  2. Elevated CK17 expression has been linked to lymph node metastasis in oral squamous cell carcinoma. PMID: 30066921
  3. High expression of KRT17 is frequently observed in lung adenocarcinoma tissues. PMID: 29991674
  4. Narrow-band ultraviolet B irradiation has been shown to downregulate K17 expression by inhibiting the ERK1/2 and STAT3 signaling pathways. PMID: 29349514
  5. 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
  6. 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
  7. Krt17 has been demonstrated to contribute to areca nut-induced oral malignancy. PMID: 27432155
  8. 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
  9. 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
  10. 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
  11. 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
  12. Research suggests that the loss of Krt17 may foster a protective environment for lesion-prone cervical tissue. PMID: 27065324
  13. High KR17 expression has been associated with oral cancer. PMID: 27512993
  14. 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
  15. 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
  16. The pattern of CK17 expression is a highly sensitive marker for distinguishing cutaneous lymphadenoma from basal cell carcinoma in small samples. PMID: 26968559
  17. Cytokeratin 17 immunoexpression might play a role in evaluating surgical borders in some cases of actinic keratosis and Bowen disease. PMID: 26740287
  18. Steatocystoma multiplex is associated with the R94C mutation in the KRTl7 gene, and is reported in a Chinese pedigree. PMID: 26165312
  19. Findings suggest that CK17 is involved in the development and metastasis of papillary thyroid carcinoma. PMID: 26191283
  20. Case Report: polycystic kidney disease with steatocystoma multiplex. PKD1 mutations disrupt keratin 17 polymerization. PMID: 25111597
  21. 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
  22. Data indicate that autoimmune regulator Aire mRNA transcripts are regulated in a keratin 17 (K17) dependent manner in skin tumor keratinocytes. PMID: 26168014
  23. Research concludes that K17 expression promotes oral squamous cell carcinoma cell growth and cell size but does not affect cell migration. PMID: 25736868
  24. A report on overexpression of keratin 17 in premalignant and malignant squamous lesions of the cervix. PMID: 24051697
  25. A novel heterozygous mutation, p.L91P (c.272T>C) in the helix initiation motif, associated with pachyonychia congenita type 2. PMID: 23855588
  26. Peripheral or diffuse staining for CK17 is a useful marker of invasion in anal squamous neoplastic lesions. PMID: 24335642
  27. 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
  28. Overexpression of keratin 17 is associated with epithelial ovarian cancer. PMID: 23430585
  29. A novel mutation in a Chinese pedigree of pachyonychia congenita type 2 with typical clinical presentations and an autosomal dominant inheritance pattern. PMID: 23278621
  30. A study identified a known mutation in the KRT17 gene in a family with steatocystoma. PMID: 22639854
  31. Keratin-17 expression is correlated with tumor progression in gastric adenocarcinoma and may serve as a biomarker for poor prognosis. PMID: 22695933
  32. IL-22 up-regulates K17 expression in keratinocytes in a dose-dependent manner through STAT3- and ERK1/2-dependent mechanisms. PMID: 22808266
  33. Keratin 17 is a therapeutic target for the treatment of psoriasis [review]. PMID: 22795618
  34. 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
  35. Data indicate that cytokeratin 17 (CK17) expression could be associated with the differentiation and malignancy of oral squamous cell carcinoma (OSCC). PMID: 22466643
  36. A report on homozygosity for dominant missense mutations in keratin 17 that modify the pachyonychia congenita phenotype. PMID: 22336949
  37. Both moesin and KRT17 demonstrated a tendency of increased expression as pT stage advanced. PMID: 22076435
  38. A novel interaction involving K17 and AnxA2 was identified, identifying AnxA2 as a potential regulator of keratin filaments. PMID: 22235123
  39. 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
  40. 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
  41. AIRE expression in HaCaT epidermal keratinocytes, as well as its interaction with K17, was confirmed. PMID: 21356351
  42. KRT17 is upregulated in gastric adenocarcinoma and is associated with tumor progression. PMID: 21443102
  43. Mutation of KRT17 may play a major role in the pathogenesis of this pedigree with pachyonychia congenita type 2. PMID: 21287500
  44. Overexpression of KRT17 is associated with the basal-like phenotype in breast cancer. PMID: 19882246
  45. CK17 expression is significantly higher in thyroid papillary carcinoma than benign thyroid tissue, indicating its potential diagnostic value. PMID: 14761598
  46. Mutation in the second half of the 1A domain of K17 might delay the onset of the clinical phenotype. PMID: 15102078
  47. 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
  48. KRT 17 appeared to be the most accurate marker for diagnosing micrometastases of a size greater than 450 µm. PMID: 16638858
  49. 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
  50. 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

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Database Links

HGNC: 6427

OMIM: 148069

KEGG: hsa:3872

STRING: 9606.ENSP00000308452

UniGene: Hs.2785

Involvement In Disease
Pachyonychia congenita 2 (PC2); Steatocystoma multiplex (SM)
Protein Families
Intermediate filament family
Subcellular Location
Cytoplasm.
Tissue Specificity
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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