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DNA methyltransferase 1 inhibits O6-methylguanine-DNAmethyl-transferase-mediated cell growth and metastasis of hypopharyngeal squamous carcinoma
- Source :
- Archives of Oral Biology. 128:105160
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Objective To explore the role of DNA methyltransferase 1 (DNMT1) in development and progression of hypopharyngeal squamous carcinoma. Design A total of 32 hypopharyngeal squamous carcinoma biopsy samples and 20 normal tissue specimens were collected. Immunohistochemical staining, quantitative real-time polymerase chain reaction, and Western blot were performed for expression analysis. The mRNA and protein expression in the specimens and subcellular localization were analyzed. hypopharyngeal squamous carcinoma cells (FaDu) were used for small interfering RNA of DNMT1, and proliferation, cell cycle, and apoptosis were determined in the transfected cells. Furthermore, metastatic ability and methylation status of O6-methylguanine-DNAmethyl-transferase (MGMT) promoter was assessed. Results Our results showed that DNMT1 was overexpressed, while MGMT was down expressed in hypopharyngeal squamous carcinoma. DNMT1 overexpression and MGMT down expression were significantly associated with poorly differentiated tumors, lymph node metastasis, and clinical stage. DNMT1 and MGMT were majorly distributed in the nucleus. Furthermore, knockdown of DNMT1 inhibited proliferation and metastasis, induced apoptosis and G1 phase arrest in FaDu cells, and upregulated MGMT expression to reverse methylation status of MGMT promoter. Conclusions This study for the first time demonstrated the clinical value and the role of DNMT1 and MGMT in the biological function of hypopharyngeal squamous carcinoma. This work suggested that DNMT1 might serve as a potential therapeutic target for patients with hypopharyngeal squamous carcinoma.
- Subjects :
- 0301 basic medicine
Gene knockdown
030206 dentistry
Cell Biology
General Medicine
Methylation
Cell cycle
Biology
medicine.disease
environment and public health
DNA methyltransferase
Metastasis
Squamous carcinoma
03 medical and health sciences
030104 developmental biology
0302 clinical medicine
Otorhinolaryngology
embryonic structures
Cancer research
medicine
DNMT1
Immunohistochemistry
neoplasms
General Dentistry
Subjects
Details
- ISSN :
- 00039969
- Volume :
- 128
- Database :
- OpenAIRE
- Journal :
- Archives of Oral Biology
- Accession number :
- edsair.doi...........e5d9711a280896de41e8b723c18f862e