1
|
Hong Y, Liew SC, Thean LF, Tang CL, Cheah PY. Human colorectal cancer initiation is bidirectional, and cell growth, metabolic genes and transporter genes are early drivers of tumorigenesis. Cancer Lett 2018; 431:213-218. [PMID: 29885515 DOI: 10.1016/j.canlet.2018.06.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 06/01/2018] [Accepted: 06/01/2018] [Indexed: 12/12/2022]
Abstract
The role of stem cells in the development of solid tumors remains controversial. In colorectal cancers (CRC), this is complicated by the conflicting "top-down" or "bottom-up" hypotheses of cancer initiation. We profiled the expressions of genes from the top (T) and bottom (B) crypt fractions of normal-appearing human colonic mucosa (M) at least 20 cm away from the tumor as a baseline and compared this to the genes of matched mucosa adjacent to tumors (MT) in twenty-three sporadic CRC patients. In thirteen patients, the genetic distance (M-MT) between the B fractions is smaller than the distance between the T fractions, indicating that the expressions diverge further in the top fractions (B < T). In the remaining patients, the reverse effect is observed (B > T). Assuming that a greater genetic divergence in the top or bottom fractions indicates that position as the initiation site, it is thus equally likely that human CRC initiates from 'top-down' via de-differentiated colonocytes or 'bottom-up' via dysregulated intestinal stem cells. Dysregulated genes that persist until tumor stage are not limited to tumor suppressors or oncogenes but include metabolic and transporter genes such as CA7, PHLPP2, and AQP8.
Collapse
Affiliation(s)
- Yi Hong
- Department of Colorectal Surgery, Singapore General Hospital, Singapore
| | - Soo Chin Liew
- Centre for Remote Imaging, Sensing and Processing, National University of Singapore, Singapore
| | - Lai Fun Thean
- Department of Colorectal Surgery, Singapore General Hospital, Singapore
| | - Choong Leong Tang
- Department of Colorectal Surgery, Singapore General Hospital, Singapore
| | - Peh Yean Cheah
- Department of Colorectal Surgery, Singapore General Hospital, Singapore; Saw Swee Hock School of Public Health, National University of Singapore, Singapore; Duke-NUS Medical School, National University of Singapore, Singapore.
| |
Collapse
|
2
|
Single cell time-lapse analysis reveals that podoplanin enhances cell survival and colony formation capacity of squamous cell carcinoma cells. Sci Rep 2017; 7:39971. [PMID: 28059107 PMCID: PMC5216406 DOI: 10.1038/srep39971] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 11/30/2016] [Indexed: 01/04/2023] Open
Abstract
Tumor initiating cells (TICs) are characterized by high clonal expansion capacity. We previously reported that podoplanin is a TIC-specific marker for the human squamous cell carcinoma cell line A431. The aim of this study is to explore the molecular mechanism underlying the high clonal expansion potential of podoplanin-positive A431cells using Fucci imaging. Single podoplanin-positive cells created large colonies at a significantly higher frequency than single podoplanin-negative cells, whereas no difference was observed between the two types of cells with respect to cell cycle status. Conversely, the cell death ratio of progenies derived from podoplanin-positive single cell was significantly lower than that of cells derived from podoplanin-negative cells. Single A431 cells, whose podoplanin expression was suppressed by RNA interference, exhibited increased cell death ratios and decreased frequency of large colony forming. Moreover, the frequency of large colony forming decreased significantly when podoplanin-positive single cells was treated with a ROCK (Rho-associated coiled-coil kinase) inhibitor, whereas no difference was observed in single podoplanin-negative cells. Our current study cleared that high clonal expansion capacity of podoplanin-positive TICs populations was the result of reduced cell death by podoplanin-mediated signaling. Therefore, podoplanin activity may be a therapeutic target in the treatment of squamous cell carcinomas.
Collapse
|
3
|
López-Gómez M, Casado E, Muñoz M, Alcalá S, Moreno-Rubio J, D'Errico G, Jiménez-Gordo AM, Salinas S, Sainz B. Current evidence for cancer stem cells in gastrointestinal tumors and future research perspectives. Crit Rev Oncol Hematol 2016; 107:54-71. [PMID: 27823652 DOI: 10.1016/j.critrevonc.2016.08.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 06/22/2016] [Accepted: 08/17/2016] [Indexed: 12/18/2022] Open
Abstract
Cancer stem cells (CSCs) are a very heterogeneous subpopulation of "stem-like" cancer cells that have been identified in many cancers, including leukemias and solid tumors. It is believed that CSCs drive tumor growth, malignant behavior and are responsible for the initiation of metastatic spread. In addition, CSCs have been implicated in chemotherapy and radiotherapy resistance. Current evidence supports the theory that CSCs share at least two main features of normal stem cells: self-renewal and differentiation, properties that contribute to tumor survival even in the presence of aggressive chemotherapy; however, the mechanism(s) governing the unique biology of CSCs remain unclear. In the field of gastrointestinal cancer, where we face very low survival rates across different tumor types, unraveling the role of CSCs in gastrointestinal tumors should improve our knowledge of cancer biology and chemoresistance, ultimately benefiting patient survival. Towards this end, much effort is being invested in the characterization of CSCs as a means of overcoming drug resistance and controlling metastatic spread. In this review we will cover the concept of CSCs, the current evidence for CSCs in gastrointestinal tumors and future research directions.
Collapse
Affiliation(s)
- Miriam López-Gómez
- Medical Oncology Department, Infanta Sofía University Hospital, S.S. Reyes, Madrid, Spain; Precision Oncology Laboratory, Infanta Sofía University Hospital, S.S. Reyes, Madrid, Spain.
| | - Enrique Casado
- Medical Oncology Department, Infanta Sofía University Hospital, S.S. Reyes, Madrid, Spain; Precision Oncology Laboratory, Infanta Sofía University Hospital, S.S. Reyes, Madrid, Spain
| | - Marta Muñoz
- Pathological Anatomy Department, Infanta Sofía University Hospital, S.S Reyes, Madrid, Spain
| | - Sonia Alcalá
- Department of Biochemistry, Autónoma University of Madrid, Madrid, Spain; Cancer Biology Department, Instituto de Investigaciones Biomédicas "Alberto Sols" CSIC-UAM, Madrid, Spain; Enfermedades Crónicas y Cáncer Area, Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain
| | - Juan Moreno-Rubio
- Precision Oncology Laboratory, Infanta Sofía University Hospital, S.S. Reyes, Madrid, Spain
| | - Gabriele D'Errico
- Department of Biochemistry, Autónoma University of Madrid, Madrid, Spain
| | - Ana María Jiménez-Gordo
- Medical Oncology Department, Infanta Sofía University Hospital, S.S. Reyes, Madrid, Spain; Precision Oncology Laboratory, Infanta Sofía University Hospital, S.S. Reyes, Madrid, Spain
| | - Silvia Salinas
- Pathological Anatomy Department, Infanta Sofía University Hospital, S.S Reyes, Madrid, Spain
| | - Bruno Sainz
- Department of Biochemistry, Autónoma University of Madrid, Madrid, Spain; Cancer Biology Department, Instituto de Investigaciones Biomédicas "Alberto Sols" CSIC-UAM, Madrid, Spain; Enfermedades Crónicas y Cáncer Area, Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain.
| |
Collapse
|