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Role of Krüppel-like factor 4 and heat shock protein 27 in cancer of the larynx.

Molecular and clinical oncology (2017-11-29)
Jihad Karam, Marie Claude Fadous-Khalifé, Rita Tannous, Sally Fakhreddine, Marcel Massoud, Joseph Hadchity, Georges Aftimos, Elie Hadchity
ABSTRACT

Late detection and lack of standard treatment strategies in larynx cancer patients result in high levels of mortality and poor prognosis. Prognostic stratification of larynx cancer patients based on molecular prognostic tumor biomarkers may lead to more efficient clinical management. Krüppel-like factor 4 (KLF4) and Heat Shock Protein 27 (HSP27) have an important role in tumorigenesis and are considered promising candidate biomarkers for various types of cancer. However, their role in larynx carcinoma remains to be elucidated. The present study aimed to determine KLF4 and HSP27 expression profiles in laryngeal tumors. The protein and mRNA expression levels of KLF4 and HSP27 were evaluated by immunohistochemical and reverse transcription-polymerase chain reaction analyses in 44 larynx carcinoma samples and 21 normal tissue samples, and then correlated with clinical characteristics. A differential expression of KLF4 and HSP27 was observed between normal and tumor tissues. The protein and mRNA expression levels of KLF4 were significantly decreased in larynx squamous cell carcinoma (LSCC) compared with normal tissue, whereas HSP27 was significantly overexpressed in tumor tissues compared with normal tissues, at the protein and mRNA levels. KLF4 expression decreased gradually with tumor progression whereas HSP27 expression increased. A significant difference was observed between stages I and IV. KLF4 and HSP27 exhibit opposite functions and roles in the carcinogenic process of LSCC. Their role in laryngeal cancer initiation and progression emphasizes their use as potential future targets for prognosis and treatment. KLF4 and HSP27 expression levels may act as potential biomarkers in patients with cancer of the larynx.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
GenElute FFPE RNA Purification Kit
Sigma-Aldrich
Monoclonal Anti-HSP27 antibody produced in mouse, clone G3.1, purified immunoglobulin
Sigma-Aldrich
Monoclonal Anti-KLF4 antibody produced in mouse, clone 1E6, ascites fluid
Sigma-Aldrich
Anti-Mouse IgG (whole molecule)–Peroxidase antibody produced in rabbit, IgG fraction of antiserum, buffered aqueous solution