Heat Shock Protein 40 (Hsp40) and Hsp70 Protein Expression in Oral Squamous Cell Carcinoma (OSCC)

Adi Prayitno, Elyana Asnar, Okid Parama Astirin, Dinar Rosmala, Suhartono Taat Putra

Departement of Pathobiology, Faculty of Medicine, University of Airlangga, Surabaya, Indonesia.
Department of Biology, Faculty of Science and Mathematica, University of Sebelas Maret, Surakarta, Indonesia.
Department of Dental and Oral Disease, Faculty of Medicine, University of Sebelas Maret, Surakarta, Indonesia.
Department of Ear-Nose-Throat, Faculty of Medicine, University of Sebelas Maret, Surakarta, Indonesia.

DOI: 10.4236/jct.2013.43090                

Abstract

Introduction: As a chaperone, heat shock protein acts as central integrators of protein homeostasis in cell. The form of these functions is to help setting up a complex protein molecular fold (folded protein) in many important settings, such as growth, differentiation, and the ability to live. It has become clear that the control system plays an important role if the folding process fails or an error occurs, causing folding abnormalities and targeted functionality to accumulate. The accumulation of faulty protein folding would harm cells and can result in death. Apparently, there is a correlation between protein folding error with various diseases, such as diabetes mellitus and cancer. Method: We examined protein levels in all samples using Dotblott with monoclonal antibody anti-Hsp40 and anti-Hsp70. Levels of the protein content was read using a densitometer. Modification of Dot Blot was as follows: treatment was conducted with 3 × SSC, added with 20 mL blocking solution, add with total protein samples of 10 mg/ml on nitrocellulose paper, prehybridized, incubated at 70° for 30 seconds, incubated at 70° for 30 seconds with primary antibody anti-Hsp40 or Hsp70 protein and then added with second antibody HRP anti-Hsp40 or Hsp70 protein, treated with 3 × SSC and visualized with TSA HRP, and then administered with streptavidin, biothynil tyramide, and, finally, added with chromogen (DAB) in a confined space. Result: From the analysis of the data using Manova test with Wilk’s Lambda, there were significant differences in the levels of Hsp40 between Benign Oral Lesion (mean 688.31 area) and OSCC (mean 1354.59 area) patients (p < 0.070), there was also a highly significant difference in Hsp70 levels between patients who experienced Benign Oral Lesion (mean 529.82 area) and OSCC (mean 1346.32 area) patients (p < 0.006). Conclusion: OSCC patients have increased Hsp70 levels, so it is possible that something is going wrong in protein folding. Errors in protein folding result in a new homeostasis or inhibition of apoptosis and increasing cell proliferation that triggers carcinogenesis. Hsp40 acts as co-chaperones.

Keywords

Chaperone; Hsp40; Hsp70; Misfolding; OSCC

Conflicts of Interest

The authors declare no conflicts of interest.

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