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To measure the concentrations of TRF1 and the relationships among telomere length, telomerase activity, and TRF1 levels in tumor and normal colorectal mucosa, from normal and tumoral samples of patients who underwent surgery for colorectal cancer we analyzed TRF1 protein concentration, and telomerase activity were analysed.
90% of cancers are characterized by increased telomerase activity. [28] Lung cancer is the most well characterized type of cancer associated with telomerase. [29] There is a lack of substantial telomerase activity in some cell types such as primary human fibroblasts, which become senescent after about 30–50 population doublings. [28]
If a drug can inhibit telomerase in cancer cells, the telomeres of successive generations will progressively shorten, limiting tumor growth. [56] Telomerase is a good biomarker for cancer detection because most human cancer cells express high levels of it. Telomerase activity can be identified by its catalytic protein domain .
In most multicellular eukaryotic organisms, telomerase is active only in germ cells, some types of stem cells such as embryonic stem cells, and certain white blood cells. [9] Telomerase can be reactivated and telomeres restored to the embryonic state by somatic cell nuclear transfer. [18]
The Cancer Imaging Archive (TCIA) is an open-access database of medical images for cancer research. The site is funded by the National Cancer Institute's (NCI) Cancer Imaging Program, and the contract is operated by the University of Arkansas for Medical Sciences. Data within the archive is organized into collections which typically share a ...
Two concerns with applying telomerase inhibitors in cancer treatment are that effective treatment requires continuous, long-term drug application and that off-target effects are common. [30] For example, the telomerase inhibitor imetelstat, first proposed in 2003, [31] [32] has been held up in clinical trials due to hematological toxicity. [30]
Reflect the stage of cancer; By determining the stage of cancer, it's possible to give a prognosis and treatment plan. [4] Screening for cancers; No screening test is wholly specific, and a high level of tumor marker can still be found in benign tumors. The only tumor marker currently used in screening is PSA (prostate-specific antigen ...
Alternative Lengthening of Telomeres (also known as "ALT") is a telomerase-independent mechanism by which cancer cells avoid the degradation of telomeres.. At each end of the chromosomes of most eukaryotic cells, there is a telomere: a region of repetitive nucleotide sequences which protects the end of the chromosome from deterioration or from fusion with neighboring chromosomes.