Original Article: MicroRNA Dysregulation in the Gastric Carcinogenesis Cascade: Can We Anticipate Its Role in Individualized Care?

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Pita, I (Author) Other; Libanio, D (Author) FMUP; Dias, F (Author) Other; Teixeira, AL (Author) Other; Nogueira, I (Author) Other; Rui Medeiros (Author) ICBAS; Dinis Ribeiro, M (Author) Other; Pedro Pimentel-Nunes (Author) FMUP

Journal

Title: Pathobiology

Pages: 1-13

ISSN: 1015-2008

Publisher: Karger

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 1 Citation

Other information

Authenticus ID: P-00V-7AC

DOI: 10.1159/000515548

Abstract (EN): Background: Gastric carcinogenesis progresses from normal mucosa, atrophic/metaplastic gastritis, and dysplasia to adenocarcinoma. MicroRNAs (miRNAs) regulate DNA expression and have been implicated; however, their role is not fully established. Aims: The aim of this study was to characterize plasma and tissue expression of several miRNAs in gastric carcinogenesis stages. Methods: Single-center cross-sectional study in 64 patients: 19 controls (normal mucosa); 15 with extensive atrophic/metaplastic gastritis; and 30 with early gastric neoplasia (EGN). Seven miRNAs (miR-21, miR-146a, miR-181b, miR-370, miR-375, miR 181b, and miR-490) were quantified by real time-qPCR in peripheral blood and endoscopic biopsy samples. Results: We found a significant upregulation of miR-181b, miR-490, and miR-21 in the EGN mucosa (overexpression 2-14-times higher than controls). We observed a significant underexpression of miR-146a and miR-370 in atrophic/metaplastic gastritis (86 and 66% decrease, p = 0.008 and p = 0.001) and in EGN (89 and 62% reduction, p = 0.034 and p = 0.032) compared with controls. There were no differences between lesions and nonneoplastic mucosa and no dysregulation of plasma miRNAs. Conclusion: We found significant dysregulation of 5 miRNAs in gastric carcinogenesis, suggesting a tumor suppressor role for miR-146a and miR-370 and oncogenic potential for miR-21, miR-181, and miR-490. These changes happen diffusely in the gastric mucosa, suggesting a high-risk field defect, which may influence these patients' surveillance.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13