Journal
DIGESTIVE AND LIVER DISEASE
Volume 44, Issue 7, Pages 589-596Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.dld.2012.02.016
Keywords
Gastric cancer; MicroRNA-21; Serpini1 gene
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Funding
- Executive Agency for Higher Education, Research, Development and Innovation [RU-TE-100/2010]
- NIH [DK087454, CA133012, CA146799, DK090154-01]
- American Gastroenterological Association
- Flight Attendants Medical Research Institute (FAMRI) [072119_YCSA]
- Johns Hopkins Clinician Scientist Award
- Hopkins Conte Digestive Diseases Basic & Translational Research Core Center
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Background: A thorough understanding of gastric cancer at the molecular level is urgently needed. One prominent oncogenic microRNA, miR-21, was previously reported to be upregulated in gastric cancer. Methods: We performed an unbiased search for downstream messenger RNA targets of miR-21, based on miR-21 dysregulation, by using human tissue specimens and the MKN28 human gastric carcinoma cell line. Molecular techniques include microRNA microarrays, cDNA microarrays, qRT-PCR for miR and mRNA expression, transfection of MKN28 with miR-21 inhibitor or Serpini1 followed by Western blotting, cell cycle analysis by flow cytometry and luciferase reporter assay. Results: This search identified Serpini1 as a putative miR-21 target. Luciferase assays demonstrated direct interaction between miR-21 and Serpini1 3'UTR. miR-21 and Serpini1 expression levels were inversely correlated in a subgroup of gastric cancers, suggesting a regulatory mechanism that included both of these molecules. Furthermore, Serpini1 induced growth retardation of MKN28 and induced vigorous G1/S arrest suggesting its potential tumour-suppressive function in the stomach. Conclusion: Taken together, these data suggest that in a subgroup of gastric cancers, miR-21 is upregulated, inducing downregulation of Serpini1, which in turn releases the G1-S transition checkpoint, with the end result being increased tumour growth. (C) 2012 Editrice Gastroenterologica Italians S.r.l. Published by Elsevier Ltd. All rights reserved.
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