Role of intracellular and extracellular microRNA-92A in colorectal cancer

Nami Yamada, Yoshihito Nakagawa, Nonoka Tsujimura, Minami Kumazaki, Shunsuke Noguchi, Takashi Mori, Ichiro Hirata, Kohji Maruo, Yukihiro Akao

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Colorectal cancer is one of the leading causes of cancer-related death worldwide. Previous studies have shown that miR-92a has an ONCOGENIC function in several cancers and that its up-regulation is correlated with malignant CLINICO-pathologic behaviors of colorectal cancer. It also has been suggested that circulating miR-92a in patients' plasma can be a potential biomarker for colorectal cancer. However, the precise roles of intracellular and extra cellular miR-92a are not yet understood. In this study, we examined the expression levels of miR-92a in colorectal tumors (38 cancer specimens and 56 adenoma specimens) and paired adjacent non tumorous tissues. Increased expression of miR-92a was frequently observed in the cancers compared with that in the adenomas and was correlated with advanced clinical stages, tumor depth, and size. We also demonstrated that the levels of miR-92a within micro vesicles (MVs) in the plasma of mice bearing colon cancer xeno grafts were significantly increased compared with those in control mice. One of the roles of intracellular and extra cellular miR-92a was shown to be down-regulation of Dickkopf-3 (Dkk-3), a presumed tumor suppressor gene. Within the colon cancer cells, suppression of Dkk-3 by miR-92a contributed to the cell proliferation. Extra cellular miR-92a packed within MVs secreted by colon cancer cells was delivered into endothelial cells and contributed to the proliferation and motility of these cells through down-regulation of the same target gene, Dkk-3. These data suggest that intracellular and extra cellular miR-92a had important roles in tumor growth and the tumor microenvironment in colorectal cancer.

Original languageEnglish
Pages (from-to)482-492
Number of pages11
JournalTranslational Oncology
Volume6
Issue number4
DOIs
Publication statusPublished - 01-01-2013

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MicroRNAs
Colorectal Neoplasms
Colonic Neoplasms
Neoplasms
Adenoma
Down-Regulation
Cell Proliferation
Tumor Microenvironment
Tumor Suppressor Genes
Cell Movement
Up-Regulation
Endothelial Cells
Biomarkers
Transplants
Growth
Genes

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research

Cite this

Yamada, N., Nakagawa, Y., Tsujimura, N., Kumazaki, M., Noguchi, S., Mori, T., ... Akao, Y. (2013). Role of intracellular and extracellular microRNA-92A in colorectal cancer. Translational Oncology, 6(4), 482-492. https://doi.org/10.1593/tlo.13280
Yamada, Nami ; Nakagawa, Yoshihito ; Tsujimura, Nonoka ; Kumazaki, Minami ; Noguchi, Shunsuke ; Mori, Takashi ; Hirata, Ichiro ; Maruo, Kohji ; Akao, Yukihiro. / Role of intracellular and extracellular microRNA-92A in colorectal cancer. In: Translational Oncology. 2013 ; Vol. 6, No. 4. pp. 482-492.
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Yamada, N, Nakagawa, Y, Tsujimura, N, Kumazaki, M, Noguchi, S, Mori, T, Hirata, I, Maruo, K & Akao, Y 2013, 'Role of intracellular and extracellular microRNA-92A in colorectal cancer', Translational Oncology, vol. 6, no. 4, pp. 482-492. https://doi.org/10.1593/tlo.13280

Role of intracellular and extracellular microRNA-92A in colorectal cancer. / Yamada, Nami; Nakagawa, Yoshihito; Tsujimura, Nonoka; Kumazaki, Minami; Noguchi, Shunsuke; Mori, Takashi; Hirata, Ichiro; Maruo, Kohji; Akao, Yukihiro.

In: Translational Oncology, Vol. 6, No. 4, 01.01.2013, p. 482-492.

Research output: Contribution to journalArticle

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AU - Yamada, Nami

AU - Nakagawa, Yoshihito

AU - Tsujimura, Nonoka

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AU - Noguchi, Shunsuke

AU - Mori, Takashi

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AU - Maruo, Kohji

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