RGD Reference Report - The role of DNA methyltransferase 3b in esophageal squamous cell carcinoma. - Rat Genome Database

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The role of DNA methyltransferase 3b in esophageal squamous cell carcinoma.

Authors: Chen, MF  Lu, MS  Lin, PY  Chen, PT  Chen, WC  Lee, KD 
Citation: Chen MF, etal., Cancer. 2012 Aug 15;118(16):4074-89. doi: 10.1002/cncr.26736. Epub 2011 Dec 27.
RGD ID: 9589085
Pubmed: PMID:22213175   (View Abstract at PubMed)
DOI: DOI:10.1002/cncr.26736   (Journal Full-text)

BACKGROUND: The identification of potential tumor markers can improve therapeutic planning and patient management. The objective of this study was to highlight the role of DNA methyltransferase 3b (DNMT3b) in esophageal squamous cell carcinoma (SCC). METHODS: One hundred seventy-three esophageal SCC samples were analyzed using immunohistochemical staining to correlate the expression of DNMT3b with clinical outcome. Furthermore, a human esophageal SCC cell line, CE81T, was selected for cellular and animal experiments to investigate changes in tumor behavior and treatment response after the manipulation of DNMT3b expression. RESULTS: The incidence of nuclear DNMT3b immunoreactivity in esophageal cancer specimens was significantly higher than in nonmalignant epithelium, and this incidence was linked positively to developing distant metastasis (56% in localized disease vs 80% in distant metastasis; P = .002). Furthermore, increased expression of DNMT3b was linked significantly to lower treatment response rates (P = .002) and reduced survival rates (P = .000). Inhibition of DNMT3b expression resulted in slower cellular proliferation, increased cell death, a less invasive capacity, and less epithelial-mesenchymal-transition changes. Moreover, DNMT3b silencing vectors sensitized esophageal cancer cells to irradiation and cisplatin treatment. The current results also indicated that constitutional activation of signal transducer and activator of transcription 3 (STAT3) signaling associated with inhibited expression of suppressor of cytokine signaling 3 (SOCS3) may be the mechanism underlying more aggressive tumor growth in DNMT3b-positive esophageal cancer. CONCLUSIONS: DNMT3b was linked significantly to a poor prognosis for patients with esophageal cancer. Moreover, the current results indicated that targeting this enzyme may be a promising strategy for treating esophageal cancer, as evidenced by inhibited aggressive tumor behavior and treatment resistance.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
esophagus squamous cell carcinoma disease_progressionIEP 9589085protein:increased expression:nucleus:RGD 
esophagus squamous cell carcinoma disease_progressionISODNMT3B (Homo sapiens)9589085; 9589085protein:increased expression:nucleus:RGD 

Objects Annotated

Genes (Rattus norvegicus)
Dnmt3b  (DNA methyltransferase 3 beta)

Genes (Mus musculus)
Dnmt3b  (DNA methyltransferase 3B)

Genes (Homo sapiens)
DNMT3B  (DNA methyltransferase 3 beta)


Additional Information