|Year : 2017 | Volume
| Issue : 3 | Page : 96-100
Autophagy regulated by miRNAs in colorectal cancer progression and resistance
Andrew Fesler1, Hua Liu1, Ning Wu2, Fei Liu3, Peixue Ling3, Jingfang Ju4
1 Department of Pathology, Stony Brook University, Stony Brook, NY, USA
2 Department of Pathology, Stony Brook University, Stony Brook, NY, USA; Department of Experimental Marine Biology, Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, Shandong, China
3 Shandong Academy of Pharmaceutical Sciences, Jinan, Shandong, China
4 Department of Pathology, Stony Brook University, Stony Brook, NY, USA; Shandong Academy of Pharmaceutical Sciences, Jinan, Shandong, China
|Date of Submission||20-Nov-2016|
|Date of Acceptance||12-Jan-2017|
|Date of Web Publication||8-Jun-2017|
Department of Pathology, Stony Brook University, Room 185, BST L9, Stony Brook, NY 11794, USA
Source of Support: None, Conflict of Interest: None
The catabolic process of autophagy is an essential cellular function that allows for the breakdown and recycling of cellular macromolecules. In recent years, the impact of epigenetic regulation of autophagy by noncoding miRNAs has been recognized in human cancer. In colorectal cancer, autophagy plays critical roles in cancer progression as well as resistance to chemotherapy, and recent evidence demonstrates that miRNAs are directly involved in mediating these functions. In this review, we focus on the recent advancements in the field of miRNA regulation of autophagy in colorectal cancer.
Keywords: Autophagy, cancer stem cell, chemotherapy, colorectal cancer, miRNA
|How to cite this article:|
Fesler A, Liu H, Wu N, Liu F, Ling P, Ju J. Autophagy regulated by miRNAs in colorectal cancer progression and resistance. Cancer Transl Med 2017;3:96-100
|How to cite this URL:|
Fesler A, Liu H, Wu N, Liu F, Ling P, Ju J. Autophagy regulated by miRNAs in colorectal cancer progression and resistance. Cancer Transl Med [serial online] 2017 [cited 2019 Nov 12];3:96-100. Available from: http://www.cancertm.com/text.asp?2017/3/3/96/202229
| Introduction|| |
Twenty-three years after its initial discovery in 1993, the significance of autophagy is being recognized with 2016's Nobel Prize in Physiology and Medicine. In the time since its discovery, extensive research efforts have been made to expand the fundamental understanding of autophagy in basic biology and human diseases including cancer. Autophagy is a conserved, essential, and tightly regulated biological process, in which cells undergo self-destruction. The process of autophagy involves the formation of double-membrane autophagic vacuoles (autophagosomes) around cytoplasmic components. Many of the important genes and pathways that are involved in the process and regulation of autophagy have been identified. These include the autophagy-related genes (ATGs) family of over thirty genes, including ATG1, ATG4, LC3/ATG8, and beclin-1.,, In mammalian cells, starvation conditions as well as other signals lead to inhibition of mTOR, which results in the activation of autophagy initiation kinases ULK1 and ULK2, which phosphorylate ATG13 and FIP200. The ULK1 complex is recruited to the phagophore assemble site and is essential for the initiation of autophagy. The PtdIns3K complex, which includes beclin-1, VPS34, ATG14, PIK3R4, URAG, and AMBRA, is also essential for vesicle nucleation., Formation of the ATG16, ATG5, and ATG12 conjugation complex promotes the elongation of the phagophore. The LC3 conjugation system which involves ATG4, a cysteine protease, also promotes phagophore elongation. Once formed, the mature autophagosome fuses with the lysosome to allow for the degradation of the contents of the autophagosome.,,, The autophagy regulatory circuits and key proteins involved in such process as well as the miRNAs that are involved in the regulation of some of these genes related to colorectal cancer are illustrated in [Figure 1].
|Figure 1: Schematic illustration of autophagy under stress. The autophagy process is divided into phagophore formation, elongation, autophagosome formation, fusion with lysosome, and degradation. Following the initiation stress signaling through the mTOR kinase, the hypophosphorylated ATG13 is maintained, and the autophagic vesicles are formed from the phagophore/isolation membrane to the autophagosome and autolysosome. ATG-11,-13,-17 and ULK complex mediate the early process followed by Beclin-1-hVPS-34-protein complex. hVPS-34/Beclin-1 complex converts PI into PI3P followed by ATG5-ATG12 conjugation and interaction with ATG16 L. Following the LC3 processing events, the nascent complex further undergoes elongation and expansion to form a double-membrane autophagosome. The autolysosome is formed through the docking and fusion of lysosomes docking and fusion with autophagosomes where cargo is degraded to generate amino and fatty acids. miRNAs that involved in colorectal cancer progression and resistance by mediating the initiation and elongation of the autophagy processes are illustrated in the pathway map|
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Mounting evidence has revealed that autophagy has important effects on tumor progression. Autophagy has a role in various stages of tumor progression including primary tumor initiation and expansion, invasion, tumor dormancy, metastasis, and resistance to therapy. Autophagy provides critical building blocks for tumor cells to survive during hypoxia and nutrient deprivation. It helps cancer cells gain metabolic fitness during intravasation and invasion.,, It also prolongs the survival of quiescent tumor cells during tumor dormancy. In addition, autophagy aids tumor cells in adapting to a new tissue microenvironment during metastasis to distant organs., Autophagy also promotes tumor stem cell survival in response to acute stress and environmental changes due to chemotherapy and radiation treatment. As a result, autophagy maybe a double-edge sword in cancer treatment. Autophagy triggered by chemotherapy and radiation can effectively eliminate bulk tumors and stromal tissue. At the same time, it also provides a survival advantage for the cancer stem cells during anticancer therapeutic treatment.
Recently, it has been recognized that noncoding miRNAs play key roles in autophagy., miRNAs are noncoding RNA molecules, 18–25 nucleotides in length, that regulate the expression of their target genes by mRNA degradation or translational inhibition. This regulation occurs mainly through interaction at the 3′-UTRs of the target mRNAs.,, Dysregulation of miRNAs has been associated with cancer development and progression, and miRNAs have emerged as a new research frontier for understanding cancer development at the posttranscriptional and translational levels. miRNAs have been found to regulate many cellular processes including apoptosis,,,, differentiation,,, cell proliferation,,,, and autophagy., Some miRNAs important in colorectal cancer and their targets in the autophagy pathway are shown in [Figure 1]. In this review, we highlight some of the recent research efforts on the mechanism and impact of autophagy mediated by miRNAs in colorectal cancer.
| miRNAs Regulation of Autophagy and Colorectal Cancer Progression|| |
Several miRNAs have been found to have important roles in the regulation of autophagy in colorectal cancer, and this regulation can influence cancer progression. Recent studies from our group show that miR-140 directly targets Smad2, and through repression of Smad2, overexpression of miR-140 in colon cancer cell lines inhibits invasion, proliferation, and induces cell cycle arrest. Ectopic expression of miR-140 in colorectal cancer stem cells leads to the disruption of autophagy, inhibiting tumor stem cell growth and sphere formation. We have identified ATG12 as one of the main targets of miR-140 involved in autophagy. ATG12 is important in autophagosome elongation [Figure 1] and [Table 1]. Furthermore, overexpression of miR-140 in colon cancer stem cells abolished tumor formation and metastasis in vivo. In addition, there is a progressive loss of miR-140 expression from normal colorectal mucosa to primary tumor tissues, with further reduction in liver metastatic tissues. Higher miR-140 expression is significantly correlated with better survival in patients with stage III and IV colorectal cancer. This suggests that miR-140 is a key regulator in colorectal cancer progression and metastasis, and miR-140 disrupts colon cancer stem cell growth through interrupting autophagy.
|Table 1: miRNAs and their important autophagy.related targets in colorectal cancer|
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We also discovered that miR-502 directly suppresses autophagy by targeting the small GTPase, RAB1B, in colon cancer cell lines. RAB1B modulates autophagic activity through the regulation of autophagosome formation [Figure 1]. RAB1B regulates vesicle trafficking and directly impacts autophagy., Ectopic expression of miR-502 in HCT-116 cells interrupted autophagic flux under acute and prolonged nutrient starvation and significantly decreased colon cancer cell growth. Inhibition of both p53 and RAB1B, the mediators for autophagy, can reproduce this phenotype, suggesting that autophagy plays an important role in its tumor suppressive function. Profiling of human colon cancer samples reveals that miR-502 is downregulated in tumor tissue compared to normal tissue. Ectopic expression of miR-502 in human colon cancer xenografts can significantly reduce tumor size, indicating miR-502 has potential as an adjuvant treatment for patients with colon cancer.
miR-106a and miR-106b have been shown to inhibit starvation-induced autophagy in colon cancer cells. This autophagy inhibition is the result of targeting of multiple important genes including ATG16 L and ATG12. Starvation-induced autophagy is also inhibited by miR-183 targeting UVRAG, which normally promotes autophagosome formation in colon cancer.
As opposed to these miRNAs that inhibit autophagy, miR-124 acts as tumor suppressor gene by inducing apoptosis and autophagy in colon cancer both in vitro and in vivo tumor xenografts. miR-124 targets polypyrimidine tract-binding protein 1 (PTB1), which is a splicer of pyruvate kinase muscles 1 and 2 (PKM1 and PKM2), and induces the switching of PKM isoform expression from PKM2 to PKM1. PKM2 is an activator of mTOR, so by switching expression to PKM1, mTOR activity is repressed [Figure 1]. These findings suggest that miR-124 acts as a tumor suppressor and a modulator of energy metabolism through a PTB1/PKM1/PKM2 feedback cascade in human colorectal tumor cells. miR-18a has been reported as a potential tumor suppressor by inducing apoptosis in colon cancer cells through the autophagolysosomal degradation of oncogenic heterogeneous nuclear ribonucleoprotein A1 (hnRNP A1). The function of miR-18a provides another mode of miRNA action on the degradation of key targets such as hnRNP A1 through autophagy in cancer. miR-18a also induces autophagy through inhibition of ATM which activates AMPK, an inhibitor of mTOR. These miRNAs all have shown an ability to regulate autophagy in colon cancer. This regulation influences colon cancer growth and progression.
| miRNA, Autophagy, and Resistance Mechanisms|| |
In addition to these miRNAs that regulate autophagy and influence cancer growth and progression, other miRNAs have been found to influence resistance in colon cancer through their regulation of autophagy. It has been found that under hypoxia, hypoxia-inducible factor (HIF)-1α induces miRNA-210 which, in turn, enhances autophagy and reduces radiosensitivity by downregulating Bcl-2 expression in colon cancer cells. This work provides experimental evidence that the expression of miR-210 in human colon cancer cell lines, SW480 and SW620, is significantly increased after hypoxia and forms a positive feedback loop with HIF-1α. As Bcl-2 is mediating both apoptosis and autophagy, downregulation of Bcl-2 by miR-210 reduces radiosensitivity in colon cancer cell lines. This study provides experimental evidence that autophagy may contribute to the reduction of radiosensitivity in hypoxic environments, and the process is mediated through the HIF-1α/miR-210/Bcl-2 pathway in human colon cancer cells.
miR-409-3p is a miRNA that inhibits autophagy. miR-409-3p inhibits autophagy by targeting Beclin-1. This autophagy regulation results in enhanced sensitivity to oxaliplatin. miR-22 has also been shown to influence colon cancer cell resistance to chemotherapy. In colon cancer cells, miR-22 can inhibit autophagy and promote apoptosis. This is the result of targeting BTG1. Overexpression of miR-22 in colon cancer cells, increased sensitivity to 5-FU, is one of the main chemotherapeutic agents used in the treatment of colorectal cancer. As chemoresistance is a major challenge faced in the treatment of colorectal cancer, these miRNAs and their regulation of autophagy have intriguing potential to improve patient outcomes. A summary of miRNAs and their autophagy-related targets in colorectal cancer is shown in [Table 1].
| Conclusion and Future Perspectives|| |
In summary, it is clear that a number of miRNAs regulate autophagy under various acute genotoxic stress situations in colorectal cancer. Autophagy, regulated by miRNAs, provides tumor cells with an acute response mechanism to genotoxic stress conditions such as chemotherapy. Tumor cells also grow under stress conditions due to hypoxia and/or nutrient deprivation; as a result, miRNAs that can modulate autophagy will impact cancer cell survival. This may be of particular importance in chemoresistant cancer stem cells. As tumor cells are highly heterogeneous, it might be an ideal two-hit strategy to eliminate bulk tumor cells by first using tumor suppressive miRNAs that can effectively eliminate tumor cells through autophagy. The second step will be to use the miRNAs that can disrupt autophagy to prevent cancer stem cell survival by eliminating the building blocks provided by autophagy. Therefore, it is quite conceivable that modulating miRNA will provide a new direction to change cancer cells in response to stress by altering the autophagy process, and in turn will provide new therapeutic strategies to overcome chemoresistance.
Financial support and sponsorship
This study was supported by the funding from the National Institute of Health R01CA155019 (J. Ju), R01CA197098 (J. Ju).
Conflicts of interest
There are no conflicts of interest.
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