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Radu P, Zurzu M, Tigora A, Paic V, Bratucu M, Garofil D, Surlin V, Munteanu AC, Coman IS, Popa F, Strambu V, Ramboiu S. The Impact of Cancer Stem Cells in Colorectal Cancer. Int J Mol Sci 2024; 25:4140. [PMID: 38673727 PMCID: PMC11050141 DOI: 10.3390/ijms25084140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2024] [Revised: 04/05/2024] [Accepted: 04/08/2024] [Indexed: 04/28/2024] Open
Abstract
Despite incessant research, colorectal cancer (CRC) is still one of the most common causes of fatality in both men and women worldwide. Over time, advancements in medical treatments have notably enhanced the survival rates of patients with colorectal cancer. Managing metastatic CRC involves a complex tradeoff between the potential benefits and adverse effects of treatment, considering factors like disease progression, treatment toxicity, drug resistance, and the overall impact on the patient's quality of life. An increasing body of evidence highlights the significance of the cancer stem cell (CSC) concept, proposing that CSCs occupy a central role in triggering cancer. CSCs have been a focal point of extensive research in a variety of cancer types, including CRC. Colorectal cancer stem cells (CCSCs) play a crucial role in tumor initiation, metastasis, and therapy resistance, making them potential treatment targets. Various methods exist for isolating CCSCs, and understanding the mechanisms of drug resistance associated with them is crucial. This paper offers an overview of the current body of research pertaining to the comprehension of CSCs in colorectal cancer.
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Affiliation(s)
- Petru Radu
- Tenth Department of Surgery, University of Medicine and Pharmacy “Carol Davila” Bucharest, 050474 Bucharest, Romania; (P.R.); (A.T.); (V.P.); (M.B.); (D.G.); (I.S.C.); (F.P.); (V.S.)
| | - Mihai Zurzu
- Tenth Department of Surgery, University of Medicine and Pharmacy “Carol Davila” Bucharest, 050474 Bucharest, Romania; (P.R.); (A.T.); (V.P.); (M.B.); (D.G.); (I.S.C.); (F.P.); (V.S.)
| | - Anca Tigora
- Tenth Department of Surgery, University of Medicine and Pharmacy “Carol Davila” Bucharest, 050474 Bucharest, Romania; (P.R.); (A.T.); (V.P.); (M.B.); (D.G.); (I.S.C.); (F.P.); (V.S.)
| | - Vlad Paic
- Tenth Department of Surgery, University of Medicine and Pharmacy “Carol Davila” Bucharest, 050474 Bucharest, Romania; (P.R.); (A.T.); (V.P.); (M.B.); (D.G.); (I.S.C.); (F.P.); (V.S.)
| | - Mircea Bratucu
- Tenth Department of Surgery, University of Medicine and Pharmacy “Carol Davila” Bucharest, 050474 Bucharest, Romania; (P.R.); (A.T.); (V.P.); (M.B.); (D.G.); (I.S.C.); (F.P.); (V.S.)
| | - Dragos Garofil
- Tenth Department of Surgery, University of Medicine and Pharmacy “Carol Davila” Bucharest, 050474 Bucharest, Romania; (P.R.); (A.T.); (V.P.); (M.B.); (D.G.); (I.S.C.); (F.P.); (V.S.)
| | - Valeriu Surlin
- Sixth Department of Surgery, University of Medicine and Pharmacy of Craiova, Craiova Emergency Clinical 7 Hospital, 200642 Craiova, Romania; (V.S.); (A.C.M.); (S.R.)
| | - Alexandru Claudiu Munteanu
- Sixth Department of Surgery, University of Medicine and Pharmacy of Craiova, Craiova Emergency Clinical 7 Hospital, 200642 Craiova, Romania; (V.S.); (A.C.M.); (S.R.)
| | - Ionut Simion Coman
- Tenth Department of Surgery, University of Medicine and Pharmacy “Carol Davila” Bucharest, 050474 Bucharest, Romania; (P.R.); (A.T.); (V.P.); (M.B.); (D.G.); (I.S.C.); (F.P.); (V.S.)
- General Surgery Department, “Bagdasar-Arseni” Clinical Emergency Hospital, 12 Berceni Road, 041915 Bucharest, Romania
| | - Florian Popa
- Tenth Department of Surgery, University of Medicine and Pharmacy “Carol Davila” Bucharest, 050474 Bucharest, Romania; (P.R.); (A.T.); (V.P.); (M.B.); (D.G.); (I.S.C.); (F.P.); (V.S.)
| | - Victor Strambu
- Tenth Department of Surgery, University of Medicine and Pharmacy “Carol Davila” Bucharest, 050474 Bucharest, Romania; (P.R.); (A.T.); (V.P.); (M.B.); (D.G.); (I.S.C.); (F.P.); (V.S.)
| | - Sandu Ramboiu
- Sixth Department of Surgery, University of Medicine and Pharmacy of Craiova, Craiova Emergency Clinical 7 Hospital, 200642 Craiova, Romania; (V.S.); (A.C.M.); (S.R.)
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Li Y, Shi J, Liu Z, Lin Y, Xie A, Sun W, Liu J, Liang J. Regulation of the migration of colorectal cancer stem cells via the TLR4/MyD88 signaling pathway by the novel surface marker CD14 following LPS stimulation. Oncol Lett 2024; 27:60. [PMID: 38192670 PMCID: PMC10773188 DOI: 10.3892/ol.2023.14194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 11/24/2023] [Indexed: 01/10/2024] Open
Abstract
Cell surface markers are most widely used in the study of cancer stem cells (CSCs). However, cell surface markers that are safely and stably expressed in CSCs have yet to be identified. Colonic CSCs express leukocyte CD14. CD14 binding to the ligand lipopolysaccharide (LPS) is involved in the inflammatory response via the Toll-like receptor 4 (TLR4)/myeloid differentiation factor 88 (MyD88) signaling pathway. TLR4 and MyD88 have been reported to promote the proliferation, metastasis and tumorigenicity of colon cancer cells, which is consistent with the characteristics of CSCs. In the present study, the proposed experimental method to detect cell proliferation, metastasis and tumorigenesis was used to confirm that, under LPS stimulation, CD14 promoted the proliferation, migration and tumorigenesis of colonic CSCs via the TLR4/MyD88 signaling pathway. Cell Counting Kit-8 and 5-ethynyl-2'-deoxyuridine assays were used to assess the proliferation and migration of the cells. Colony formation and nude mouse xenograft assays were used to assess the capacity of cells to form tumors. Using western blotting and reverse transcription-quantitative PCR, the mRNA and protein levels of CD14, TLR4 and MyD88 were examined. It was confirmed that CD14 promoted the proliferation, metastasis and tumorigenesis of colon CSCs in response to LPS stimulation via the TLR4/MyD88 signaling pathway, and CD14+ colon cancer cells were successfully isolated and sorted. According to the results of proliferation assay, it was determined that CD14 regulated the LPS-induced proliferation of colon CSCs. CD14, TLR4 and MyD88 protein and mRNA expression was upregulated in colon CSCs in response to LPS stimulation. This indicates a potential novel target for colon CSC-related studies.
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Affiliation(s)
- Yufei Li
- Morphology Laboratory, Mudanjiang Medical University, Mudanjiang, Heilongjiang 157011, P.R. China
| | - Jiayi Shi
- School of Life Sciences, Mudanjiang Medical University, Mudanjiang, Heilongjiang 157011, P.R. China
| | - Zhixin Liu
- Morphology Laboratory, Mudanjiang Medical University, Mudanjiang, Heilongjiang 157011, P.R. China
| | - Yonggang Lin
- Department of Extracorporeal Circulation, Mudanjiang Cardiovascular Disease Hospital, Mudanjiang, Heilongjiang 157011, P.R. China
| | - An Xie
- Morphology Laboratory, Mudanjiang Medical University, Mudanjiang, Heilongjiang 157011, P.R. China
| | - Wenxiu Sun
- Morphology Laboratory, Mudanjiang Medical University, Mudanjiang, Heilongjiang 157011, P.R. China
| | - Jiaqi Liu
- Morphology Laboratory, Mudanjiang Medical University, Mudanjiang, Heilongjiang 157011, P.R. China
| | - Jun Liang
- Morphology Laboratory, Mudanjiang Medical University, Mudanjiang, Heilongjiang 157011, P.R. China
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Facey COB, Hunsu VO, Zhang C, Osmond B, Opdenaker LM, Boman BM. CYP26A1 Links WNT and Retinoic Acid Signaling: A Target to Differentiate ALDH+ Stem Cells in APC-Mutant CRC. Cancers (Basel) 2024; 16:264. [PMID: 38254755 PMCID: PMC10813786 DOI: 10.3390/cancers16020264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/02/2024] [Accepted: 01/02/2024] [Indexed: 01/24/2024] Open
Abstract
APC mutation is the main driving mechanism of CRC development and leads to constitutively activated WNT signaling, overpopulation of ALDH+ stem cells (SCs), and incomplete differentiation. We previously reported that retinoic acid (RA) receptors are selectively expressed in ALDH+ SCs, which provides a way to target cancer SCs with retinoids to induce differentiation. Hypotheses: A functional link exists between the WNT and RA pathways, and APC mutation generates a WNT:RA imbalance that decreases retinoid-induced differentiation and increases ALDH+ SCs. Accordingly, to restore parity in WNT:RA signaling, we induce wt-APC expression in APC-mutant CRC cells, and we assess the ability of all-trans retinoic acid (ATRA) to induce differentiation. We found that ATRA increased expression of the WNT target gene, CYP26A1, and inducing wt-APC reduced this expression by 50%. Thus, the RA and WNT pathways crosstalk to modulate CYP26A1, which metabolizes retinoids. Moreover, inducing wt-APC augments ATRA-induced cell differentiation by: (i) decreasing cell proliferation; (ii) suppressing ALDH1A1 expression; (iii) decreasing ALDH+ SCs; and (iv) increasing neuroendocrine cell differentiation. A novel CYP26A1-based network that links WNT and RA signaling was also identified by NanoString profiling/bioinformatics analysis. Furthermore, CYP26A1 inhibitors sensitized CRC cells to the anti-proliferative effect of drugs that downregulate WNT signaling. Notably, in wt-APC-CRCs, decreased CYP26A1 improved patient survival. These findings have strong potential for clinical translation.
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Affiliation(s)
- Caroline O. B. Facey
- Cawley Center for Translational Cancer Research, Helen F. Graham Cancer Center and Research Institute, Newark, DE 19713, USA; (C.O.B.F.); (V.O.H.); (C.Z.); (B.O.); (L.M.O.)
| | - Victoria O. Hunsu
- Cawley Center for Translational Cancer Research, Helen F. Graham Cancer Center and Research Institute, Newark, DE 19713, USA; (C.O.B.F.); (V.O.H.); (C.Z.); (B.O.); (L.M.O.)
- Department Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | - Chi Zhang
- Cawley Center for Translational Cancer Research, Helen F. Graham Cancer Center and Research Institute, Newark, DE 19713, USA; (C.O.B.F.); (V.O.H.); (C.Z.); (B.O.); (L.M.O.)
- Department Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | - Brian Osmond
- Cawley Center for Translational Cancer Research, Helen F. Graham Cancer Center and Research Institute, Newark, DE 19713, USA; (C.O.B.F.); (V.O.H.); (C.Z.); (B.O.); (L.M.O.)
- Department Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | - Lynn M. Opdenaker
- Cawley Center for Translational Cancer Research, Helen F. Graham Cancer Center and Research Institute, Newark, DE 19713, USA; (C.O.B.F.); (V.O.H.); (C.Z.); (B.O.); (L.M.O.)
| | - Bruce M. Boman
- Cawley Center for Translational Cancer Research, Helen F. Graham Cancer Center and Research Institute, Newark, DE 19713, USA; (C.O.B.F.); (V.O.H.); (C.Z.); (B.O.); (L.M.O.)
- Department Biological Sciences, University of Delaware, Newark, DE 19716, USA
- Department Pharmacology & Experimental Therapeutics, Thomas Jefferson University, Philadelphia, PA 19107, USA
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Novoa Díaz MB, Carriere P, Gentili C. How the interplay among the tumor microenvironment and the gut microbiota influences the stemness of colorectal cancer cells. World J Stem Cells 2023; 15:281-301. [PMID: 37342226 PMCID: PMC10277969 DOI: 10.4252/wjsc.v15.i5.281] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Revised: 03/06/2023] [Accepted: 04/17/2023] [Indexed: 05/26/2023] Open
Abstract
Colorectal cancer (CRC) remains the third most prevalent cancer disease and involves a multi-step process in which intestinal cells acquire malignant characteristics. It is well established that the appearance of distal metastasis in CRC patients is the cause of a poor prognosis and treatment failure. Nevertheless, in the last decades, CRC aggressiveness and progression have been attributed to a specific cell population called CRC stem cells (CCSC) with features like tumor initiation capacity, self-renewal capacity, and acquired multidrug resistance. Emerging data highlight the concept of this cell subtype as a plastic entity that has a dynamic status and can be originated from different types of cells through genetic and epigenetic changes. These alterations are modulated by complex and dynamic crosstalk with environmental factors by paracrine signaling. It is known that in the tumor niche, different cell types, structures, and biomolecules coexist and interact with cancer cells favoring cancer growth and development. Together, these components constitute the tumor microenvironment (TME). Most recently, researchers have also deepened the influence of the complex variety of microorganisms that inhabit the intestinal mucosa, collectively known as gut microbiota, on CRC. Both TME and microorganisms participate in inflammatory processes that can drive the initiation and evolution of CRC. Since in the last decade, crucial advances have been made concerning to the synergistic interaction among the TME and gut microorganisms that condition the identity of CCSC, the data exposed in this review could provide valuable insights into the biology of CRC and the development of new targeted therapies.
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Affiliation(s)
- María Belén Novoa Díaz
- Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Bahía Blanca 8000, Buenos Aires, Argentina
- Instituto de Ciencias Biológicas y Biomédicas del Sur, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)- Universidad Nacional del Sur (UNS), Bahía Blanca 8000, Buenos Aires, Argentina
| | - Pedro Carriere
- Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Bahía Blanca 8000, Buenos Aires, Argentina
- Instituto de Ciencias Biológicas y Biomédicas del Sur, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)- Universidad Nacional del Sur (UNS), Bahía Blanca 8000, Buenos Aires, Argentina
| | - Claudia Gentili
- Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Bahía Blanca 8000, Buenos Aires, Argentina
- Instituto de Ciencias Biológicas y Biomédicas del Sur, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)- Universidad Nacional del Sur (UNS), Bahía Blanca 8000, Buenos Aires, Argentina
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Garza Treviño EN, Quiroz Reyes AG, Rojas Murillo JA, de la Garza Kalife DA, Delgado Gonzalez P, Islas JF, Estrada Rodriguez AE, Gonzalez Villarreal CA. Cell Therapy as Target Therapy against Colon Cancer Stem Cells. Int J Mol Sci 2023; 24:ijms24098163. [PMID: 37175871 PMCID: PMC10179203 DOI: 10.3390/ijms24098163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 04/25/2023] [Accepted: 04/25/2023] [Indexed: 05/15/2023] Open
Abstract
Cancer stem cells (CSCs) are a small subpopulation of cells within tumors with properties, such as self-renewal, differentiation, and tumorigenicity. CSCs have been proposed as a plausible therapeutic target as they are responsible for tumor recurrence, metastasis, and conventional therapy resistance. Selectively targeting CSCs is a promising strategy to eliminate the propagation of tumor cells and impair overall tumor development. Recent research shows that several immune cells play a crucial role in regulating tumor cell proliferation by regulating different CSC maintenance or proliferation pathways. There have been great advances in cellular immunotherapy using T cells, natural killer (NK) cells, macrophages, or stem cells for the selective targeting of tumor cells or CSCs in colorectal cancer (CRC). This review summarizes the CRC molecular profiles that may benefit from said therapy and the main vehicles used in cell therapy against CSCs. We also discuss the challenges, limitations, and advantages of combining conventional and/or current targeted treatments in the late stages of CRC.
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Affiliation(s)
- Elsa N Garza Treviño
- Laboratorio de Terapia Celular, Departamento de Bioquímica y Medicina Molecular, Facultad de Medicina, Universidad Autónoma de Nuevo León, Av. Dr. José Eleuterio González 235, Monterrey 64460, Nuevo León, Mexico
| | - Adriana G Quiroz Reyes
- Laboratorio de Terapia Celular, Departamento de Bioquímica y Medicina Molecular, Facultad de Medicina, Universidad Autónoma de Nuevo León, Av. Dr. José Eleuterio González 235, Monterrey 64460, Nuevo León, Mexico
| | - Juan Antonio Rojas Murillo
- Laboratorio de Terapia Celular, Departamento de Bioquímica y Medicina Molecular, Facultad de Medicina, Universidad Autónoma de Nuevo León, Av. Dr. José Eleuterio González 235, Monterrey 64460, Nuevo León, Mexico
| | - David A de la Garza Kalife
- Laboratorio de Terapia Celular, Departamento de Bioquímica y Medicina Molecular, Facultad de Medicina, Universidad Autónoma de Nuevo León, Av. Dr. José Eleuterio González 235, Monterrey 64460, Nuevo León, Mexico
| | - Paulina Delgado Gonzalez
- Laboratorio de Terapia Celular, Departamento de Bioquímica y Medicina Molecular, Facultad de Medicina, Universidad Autónoma de Nuevo León, Av. Dr. José Eleuterio González 235, Monterrey 64460, Nuevo León, Mexico
| | - Jose F Islas
- Laboratorio de Terapia Celular, Departamento de Bioquímica y Medicina Molecular, Facultad de Medicina, Universidad Autónoma de Nuevo León, Av. Dr. José Eleuterio González 235, Monterrey 64460, Nuevo León, Mexico
| | - Ana Esther Estrada Rodriguez
- Departamento de Ciencias Básicas, Vicerrectoría de Ciencias de la Salud, Universidad de Monterrey, Ignacio Morones Prieto 4500. Jesus M. Garza, San Pedro Garza García 66238, Nuevo León, Mexico
| | - Carlos A Gonzalez Villarreal
- Departamento de Ciencias Básicas, Vicerrectoría de Ciencias de la Salud, Universidad de Monterrey, Ignacio Morones Prieto 4500. Jesus M. Garza, San Pedro Garza García 66238, Nuevo León, Mexico
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Harbiyeli IFC, Burtea DE, Ivan ET, Streață I, Nicoli ER, Uscatu D, Șerbănescu MS, Ioana M, Vilmann P, Săftoiu A. Assessing Putative Markers of Colorectal Cancer Stem Cells: From Colonoscopy to Gene Expression Profiling. Diagnostics (Basel) 2022; 12:diagnostics12102280. [PMID: 36291969 PMCID: PMC9601164 DOI: 10.3390/diagnostics12102280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 09/12/2022] [Accepted: 09/14/2022] [Indexed: 11/16/2022] Open
Abstract
Cancer stem cells (CSCs) are proposed to be involved in colorectal cancer (CRC) initiation, growth, and metastasis. The aim of our pilot study was to assess possible correlations between the clinicopathological characteristics of CRC patients and CSCs gene expression patterns, in order to provide insight into new methods for patient stratification and targeted therapeutic strategies. Our study involved 60 CRC patients, and the following three specific CSC genes were targeted: PROM1/CD133, ALCAM/CD166 and HCAM /CD44. Data are presented as relative mRNA expression of target genes to GAPDH. The expression of total CD133 and CD166 was assessed in paired samples of CRC tumors and adjacent tissue, while CD44 was assessed in similar samples. The qRT-PCR analysis detected all three targeted genes to different extents, in both normal and tumor tissue. In nine cases (15.69%), total CD133 had a higher expression in tumor tissue, whilst in 28 cases (47.06%) the expression was higher in non-malignant peritumor tissue. The total CD166 expression was increased in tumor tissue compared with paired non-invaded peritumor samples in eight cases (13.73%), whilst in eight cases (13.73%) the expression was higher in non-malignant peritumor tissue. Total CD44 expression was higher in tumor tissue compared with paired non-invaded peritumor samples in 47 cases (78.95%). In the remaining cases the difference between paired samples was biologically insignificant. In conclusion, our study suggests that qRT-PCR is feasible in assessing the gene expression profiles of CSCs from CRC, and a promising pathway to be followed for determining how often a person needs screening by colonoscopy and at which age to start. This could improve CRC diagnosis and early patient stratification, and open the way for new oncologic treatment development.
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Affiliation(s)
- Irina Florina Cherciu Harbiyeli
- Research Center of Gastroenterology and Hepatology Craiova, University of Medicine and Pharmacy Craiova, 200349 Craiova, Romania
| | - Daniela Elena Burtea
- Research Center of Gastroenterology and Hepatology Craiova, University of Medicine and Pharmacy Craiova, 200349 Craiova, Romania
- Correspondence:
| | - Elena Tatiana Ivan
- Research Center of Gastroenterology and Hepatology Craiova, University of Medicine and Pharmacy Craiova, 200349 Craiova, Romania
| | - Ioana Streață
- Human Genomics Laboratory, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Elena Raluca Nicoli
- Human Genomics Laboratory, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Daniel Uscatu
- Human Genomics Laboratory, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Mircea-Sebastian Șerbănescu
- Department of Medical Informatics and Biostatistics, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Mihai Ioana
- Human Genomics Laboratory, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Peter Vilmann
- Gastro Unit, Division of Endoscopy, Copenhagen University Hospital Herlev, 2730 Herlev, Denmark
| | - Adrian Săftoiu
- Research Center of Gastroenterology and Hepatology Craiova, University of Medicine and Pharmacy Craiova, 200349 Craiova, Romania
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Liu C, Wang JL, Wu DZ, Yuan YW, Xin L. Methionine restriction enhances the chemotherapeutic sensitivity of colorectal cancer stem cells by miR-320d/c-Myc axis. Mol Cell Biochem 2022; 477:2001-2013. [PMID: 35394639 DOI: 10.1007/s11010-022-04416-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Accepted: 03/16/2022] [Indexed: 11/25/2022]
Abstract
Chemotherapy resistance of colorectal cancer stem cells (CRC-SCs) has become a major challenge in clinical treatment of cancer. Methionine restriction (MR) enhances the therapeutic effect of chemotherapeutic agents. The aim of this study was to explore the molecular pathways that MR affects the chemotherapeutic sensitivity of CRC-SCs. CD133+ and CD133- SW480 or SW620 cells were isolated by magnetic-activated cell sorting (MACS). Mouse xenograft tumor model was established by subcutaneous inoculation of CD133+ SW480. MTT assay was used to detect cell viability. Phase distribution of cell cycle was detected by flow cytometry. Western blotting was used to detect drug-resistant related protein expression. miR-320d and transcription factor c-Myc expressions were detected by qRT-PCR. The interaction between miR-320d and c-Myc was verified by luciferase assay. CD133+ SW480 and SW620 cells were more resistant to 5-fluorouracil (5-FU) than CD133- cells. In vitro and in vivo experiments showed that 5-FU and MR combined therapy further inhibited CD133+ cell activity and ATP binding cassette subfamily G member 2 (ABCG2) expression, and reduced tumor volume compared with drug administration alone. Interference with miR-320d or overexpression of c-Myc reversed the increased chemotherapeutic sensitivity of CRC-SCs induced by synergistic therapy with 5-FU and MR. miR-320d can target and regulate c-Myc. Interference with c-Myc could reverse the increase in cell viability and ABCG2 expression caused by down-regulation of miR-320d. In conclusion, the combined chemotherapy with MR can enhance the chemotherapeutic sensitivity of CRC-SCs by up-regulation of miR-320d to inhibit c-Myc expression, which lays a molecular basis for MR regulation of chemotherapeutic sensitivity of CRC-SCs.
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Affiliation(s)
- Chuan Liu
- Jiangxi Key Laboratory of Molecular Medicine, The Second Affiliated Hospital of Nanchang University, Nanchang, 330006, Jiangxi Province, China
| | - Jin-Liang Wang
- Department of General Surgery, The Second Affiliated Hospital of Nanchang University, No. 1 Minde Road, Donghu District, Nanchang, 330006, Jiangxi Province, China
| | - Deng-Zhong Wu
- Department of General Surgery, The Second Affiliated Hospital of Nanchang University, No. 1 Minde Road, Donghu District, Nanchang, 330006, Jiangxi Province, China
| | - Yi-Wu Yuan
- Department of General Surgery, The Second Affiliated Hospital of Nanchang University, No. 1 Minde Road, Donghu District, Nanchang, 330006, Jiangxi Province, China
| | - Lin Xin
- Department of General Surgery, The Second Affiliated Hospital of Nanchang University, No. 1 Minde Road, Donghu District, Nanchang, 330006, Jiangxi Province, China.
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