Open Access

Catalpol‑mediated microRNA‑34a suppresses autophagy and malignancy by regulating SIRT1 in colorectal cancer

  • Authors:
    • Peng‑Fei Qiao
    • Lei Yao
    • Zhao‑Lin Zeng
  • View Affiliations

  • Published online on: February 7, 2020     https://doi.org/10.3892/or.2020.7494
  • Pages: 1053-1066
  • Copyright: © Qiao et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Colorectal cancer (CRC) is one of the most common digestive tract tumors worldwide. Catalpol exerts inhibitory effects on the progression of several cancer types by regulating microRNAs (miRs). However, the precise role and carcinostatic mechanism of catalpol on CRC cells are poorly understood which limits the application of catalpol treatment. In the present study, miR‑34a and sirtuin 1 (SIRT1) expression levels were detected in CRC tissues and CRC cell lines by RT‑qPCR. Computational software analysis, luciferase assays and western blotting were used to demonstrate the downstream target of miR‑34a in CRC cells. Effects of catalpol on cell viability, apoptosis, autophagic flux and the miR‑34a/SIRT1 axis in the CRC cells were assessed by CCK‑8 assay, flow cytometry, electron microscopy and western blotting, respectively. Whether the miR‑34a/SIRT1 axis participated in catalpol‑mediated autophagy and apoptosis was investigated. The effects of catalpol on the miR‑34a/SIRT1 axis and malignant behavior were evaluated in a rat model of azoxymethane (AOM)‑induced CRC. It was revealed that miR‑34a expression levels were significantly decreased while SIRT1 was overexpressed in most of the CRC tissues and all the CRC cell lines. Clinically, a low level of miR‑34a was correlated with poor clinicopathological characteristics in CRC patients. Catalpol reduced cell viability, suppressed autophagy, promoted apoptosis, and regulated the expression of SIRT1 by inducing miR‑34a in vitro and in vivo. The autophagy‑inhibiting effect of catalpol may be a mechanism to promote apoptosis of CRC cells. miR‑34a mimic transfection resulted in autophagy‑suppressive activity similar to that of catalpol, while the miR‑34a inhibitor attenuated the antiautophagic effects of catalpol. In conclusion, miR‑34a is involved in regulating catalpol‑mediated autophagy and malignant behavior by directly inhibiting SIRT1 in CRC.
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April-2020
Volume 43 Issue 4

Print ISSN: 1021-335X
Online ISSN:1791-2431

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Spandidos Publications style
Qiao PF, Yao L and Zeng ZL: Catalpol‑mediated microRNA‑34a suppresses autophagy and malignancy by regulating SIRT1 in colorectal cancer. Oncol Rep 43: 1053-1066, 2020
APA
Qiao, P., Yao, L., & Zeng, Z. (2020). Catalpol‑mediated microRNA‑34a suppresses autophagy and malignancy by regulating SIRT1 in colorectal cancer. Oncology Reports, 43, 1053-1066. https://doi.org/10.3892/or.2020.7494
MLA
Qiao, P., Yao, L., Zeng, Z."Catalpol‑mediated microRNA‑34a suppresses autophagy and malignancy by regulating SIRT1 in colorectal cancer". Oncology Reports 43.4 (2020): 1053-1066.
Chicago
Qiao, P., Yao, L., Zeng, Z."Catalpol‑mediated microRNA‑34a suppresses autophagy and malignancy by regulating SIRT1 in colorectal cancer". Oncology Reports 43, no. 4 (2020): 1053-1066. https://doi.org/10.3892/or.2020.7494