cancer stem cells

Identification and characterization of cancer stem cells in human head and neck squamous cell carcinoma

Source: 7thspace.com Author: staff Current evidence suggests that initiation, growth, and invasion of cancer are driven by a small population of cancer stem cells (CSC). Previous studies have identified CD44+ cells as cancer stem cells in head and neck squamous cell carcinoma (HNSCC). However, CD44 is widely expressed in most cells in HNSCC tumor samples and several cell lines tested. We previously identified a small population of CD24+/CD44+ cells in HNSCC. In this study, we examined whether this population of cells may represent CSC in HNSCC. Methods: CD24+/CD44+ cells from HNSCC cell lines were sorted by flow cytometry, and their phenotype was confirmed by qRT-PCR. Their self-renewal and differentiation properties, clonogenicity in collagen gels, and response to anticancer drugs were tested in vitro. The tumorigenicity potential of CD24+/CD44+ cells was tested in athymic nude mice in vivo. Results: Our results show that CD24+/CD44+ cells possessed stemness characteristics of self-renewal and differentiation. CD24+/CD44+ cells showed higher cell invasion in vitro and made higher number of colonies in collagen gels compared to CD24-/CD44+ HNSCC cells. In addition, the CD24+/CD44+ cells were more chemo-resistant to gemcitabine and cisplatin compared to CD24-/CD44+ cells. In vivo, CD24+/CD44+ cells showed a tendency to generate larger tumors in nude mice compared to CD24-/CD44+ cell population. Conclusion: Our study clearly demonstrates that a distinct small population of CD24+/CD44+ cells is present in HNSCC that shows stem cell-like properties. This distinct small population of cells should be further characterized and may provide an opportunity to target HNSCC CSC for [...]

Oral Cancer Foundation News Team - A2014-03-16T08:39:30-07:00March, 2014|Oral Cancer News|

University of Michigan scientists are at the forefront of cancer stem cell research

Source: www.annarbor.com Author: Betsy de Parry Nine years ago, I walked into the University of Michigan Comprehensive Cancer Center for the first time and walked out as a terrified cancer patient. During all the months that I was in treatment, I never saw the labs or gave a thought to the research that was being conducted in them. And then, when standard treatment failed to stop my cancer, I was rescued by a new therapy that was pioneered at U-M by Dr. Mark Kaminski, and I began to appreciate those labs we patients never see and the discoveries that are made in them. Discoveries, after all, save lives. Indeed, labs are hotbeds of discovery. And the labs at Michigan are turning out stem cell research that is revolutionizing the way many cancers are treated. I know — stem cells are two words that stir passion and debate, but there are stem cells... and there are stem cells. What distinguishes them from other cells is their ability to divide and make exact copies of themselves indefinitely, a process called self-renewal, and their ability to change, or differentiate, into other types of cells. Embryonic stem cells — the controversial ones — have unlimited potential to become any type of cell. Adult stem cells — with which we're born — are more restricted than embryonic stem cells in terms of what they can become, but they can still differentiate. For example, adult stem cells in our bone marrow, known as hematopoietic cells, constantly [...]

Oral Cancer Foundation News Team - A2011-05-07T05:34:43-07:00May, 2011|Oral Cancer News|

Distinct population of highly malignant cells in a head and neck squamous cell carcinoma cell line established by xenograft model

Source: Journal of Biomedical Science Author: Staff The progression and metastasis of solid tumors, including head and neck squamous cell carcinoma (HNSCC), have been related to the behavior of a small subpopulation of cancer stem cells. Here, we have established a highly malignant HNSCC cell line, SASVO3, from primary tumors using three sequential rounds of xenotransplantation. SASVO3 possesses enhanced tumorigenic ability both in vitro and in vivo. Moreover, SASVO3 exhibits properties of cancer stem cells, including that increased the abilities of sphere-forming, the number of side population cells, the potential of transplanted tumor growth and elevated expression of the stem cell marker Bmi1. Injection of SASVO3 into the tail vein of nude mice resulted in lung metastases. These results are consistent with the postulate that the malignant and/or metastasis potential of HNSCC cells may reside in a stem-like subpopulation. Authors: Chi-Yuan ChenShih-Hwa ChiouChih-Yang HuangChia-Ing JanShu-Chun LinMing-Long TsaiJeng-Fan Lo Source: Journal of Biomedical Science 2009, 16:100

Oral Cancer Foundation News Team - A2009-11-19T10:02:44-07:00November, 2009|Oral Cancer News|

Screening could lead to more potent cancer drugs

Source: nytimes.com Author: Nicholas Wade Researchers have discovered a way to identify drugs that can specifically attack and kill cancer stem cells, a finding that could lead to a new generation of anticancer medicines and a new strategy of treatment. Many researchers believe that tumor growth is driven by cancerous stem cells that, for reasons not understood, are highly resistant to standard treatments. Chemotherapy agents may kill off 99 percent of cells in a tumor, but the stem cells that remain can make the cancer recur, the theory holds, or spread to other tissues to cause new cancers. Stem cells, unlike mature cells, can constantly renew themselves and are thought to be the source of cancers when, through mutations in their DNA, they throw off their natural restraints. A practical test of this theory has been difficult because cancer stem cells are hard to recognize and have proved elusive targets. But a team at the Broad Institute, a Harvard-M.I.T. collaborative for genomics research, has devised a way of screening for drugs that attack cancer stem cells but leave ordinary cells unharmed. Cancer stem cells are hard to maintain in sufficient numbers, but the Broad Institute team devised a genetic manipulation to keep breast cancer stem cells trapped in the stem cell state. The team, led by Piyush B. Gupta, screened 16,000 chemicals, including all known chemotherapeutic agents approved by the Food and Drug Administration. The team reported in the Thursday issue of Cell that 32 of the chemicals selectively went [...]

Oral Cancer Foundation News Team - A2009-08-14T11:27:04-07:00August, 2009|Oral Cancer News|