Reduced expression of manganese superoxide dismutase mRNA may correlate with invasiveness in esophageal carcinoma.

Abstract:

:Little is known about the expression and antioxidant function of manganese superoxide dismutase (Mn-SOD) in esophageal squamous cell carcinoma. To determine the significance of Mn-SOD in esophageal squamous cell carcinomas, Mn-SOD mRNA expression was examined in 45 esophageal squamous cell carcinomas and the corresponding normal mucosal tissues by reverse transcription-polymerase chain reaction. The tumor/normal (T/N) ratio of 45 patients with esophageal carcinoma was calculated, and the data were clinicopathologically analyzed. The T/N ratio of Mn-SOD mRNA expression was less than 0.5 in 11 (32.4%) of 34 esophageal carcinoma cases without any preoperative treatments, while none of 11 cases who underwent preoperative chemotherapy showed a T/N ratio of <0.5 (p < 0.05). There was an inverse correlation between the Mn-SOD expression level and the degree of venous invasion (p < 0.05) as well as lymphatic invasion (p < 0.05). Furthermore, poorly differentiated squamous cell carcinoma showed significantly lower Mn-SOD mRNA expression levels than well differentiated carcinoma (p < 0.05). Our results suggest that Mn-SOD mRNA was frequently reduced in esophageal carcinoma when compared to the normal mucosa and the reduced expression levels of Mn-SOD mRNA may lead to an accumulation of superoxide radicals in conjunction with the increased invasiveness of esophageal carcinoma.

journal_name

Oncology

journal_title

Oncology

authors

Toh Y,Kuninaka S,Mori M,Oshiro T,Ikeda Y,Nakashima H,Baba H,Kohnoe S,Okamura T,Sugimachi K

doi

10.1159/000012165

subject

Has Abstract

pub_date

2000-09-01 00:00:00

pages

223-8

issue

3

eissn

0030-2414

issn

1423-0232

pii

12165

journal_volume

59

pub_type

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