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01-02-2019 | Original Article

Overexpression of nicotinamide N-methyltransferase in HSC-2 OSCC cell line: effect on apoptosis and cell proliferation

Authors: Riccardo Seta, Marco Mascitti, Roberto Campagna, Davide Sartini, Stefania Fumarola, Andrea Santarelli, Michele Giuliani, Monia Cecati, Lorenzo Lo Muzio, Monica Emanuelli

Published in: Clinical Oral Investigations | Issue 2/2019

Abstract

Objectives

Oral squamous cell carcinoma (OSCC) is the most common malignancy of oral cavity. Despite advances in therapeutic approaches, the 5-year survival rate for oral cancer has not improved in the last three decades. Therefore, new molecular targets for early diagnosis and treatment of OSCC are needed. In the present study, we focused on the enzyme nicotinamide N-methyltransferase (NNMT). We have previously shown that enzyme expression is upregulated in OSCC and NNMT knockdown in PE/CA PJ-15 cells significantly decreased cell growth in vitro and tumorigenicity in vivo.

Material and methods

To further explore the role of the enzyme in oral cancer cell metabolism, HSC-2 cells were transfected with the NNMT expression vector (pcDNA3-NNMT) and the effect of enzyme upregulation on cell proliferation was evaluated by MTT assay. Subsequently, we investigated at molecular level the role of NNMT on apoptosis and cell proliferation, by exploring the expression of β-catenin, survivin, and Ki-67 by real-time PCR. Moreover, we performed immunohistochemistry on 20 OSCC tissue samples to explore the expression level of NNMT and survivin ΔEx3 isoform.

Results

Enzyme upregulation significantly increased cell growth in vitro. Moreover, a positive correlation between NNMT and survivin ΔEx3 isoform expression levels was found both in HSC-2 cells and in OSCC tissue samples.

Conclusion

Taken together, our results indicate a possible involvement of NNMT in the proliferation and tumorigenic capacity of OSCC cells and seem to suggest that the enzyme could represent a potential target for the treatment of oral cancer.

Clinical relevance

The involvement of NNMT in cell growth and anti-apoptotic mechanisms seems to suggest that this enzyme could be a new therapeutic target to improve the survival of OSCC patients.

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Title: Overexpression of nicotinamide N-methyltransferase in HSC-2 OSCC cell line: effect on apoptosis and cell proliferation
Authors: Riccardo Seta
Marco Mascitti
Roberto Campagna
Davide Sartini
Stefania Fumarola
Andrea Santarelli
Michele Giuliani
Monia Cecati
Lorenzo Lo Muzio
Monica Emanuelli
Publication date: 01-02-2019
Publisher: Springer Berlin Heidelberg
Published in: Clinical Oral Investigations / Issue 2/2019
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-018-2497-8

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Overexpression of nicotinamide N-methyltransferase in HSC-2 OSCC cell line: effect on apoptosis and cell proliferation

Abstract

Objectives

Material and methods

Results

Conclusion

Clinical relevance

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Objectives

Material and methods

Results

Conclusion

Clinical relevance

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