Op Ed from Vice Chair Barbara Canales
3:14 PM (49 minutes ago)
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A blog about research, awareness, prevention, treatment and survivorship of Breast Cancer and all cancers, including targeted scientific research and a grassroots approach to increase screening for cancer, especially in the low income and under-insured population of El Paso, Texas, with a view to expand this new health care model to many other 'minority' populations across the United States and beyond
3:14 PM (49 minutes ago)
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Study: Enzyme Plays Important Role in CML Stem Cell Reprogramming
By Dave Levitan |
January 18, 2013
Researchers have identified an enzyme that plays an important role in
the reprogramming of malignant progenitor cells in chronic myeloid
leukemia (CML). The enzyme, adenosine(Drug information on adenosine)
deaminase acting on RNA 1 (ADAR1), could represent a target for
selecting and eradicating leukemia stem cells, according to a paper published online ahead of print on December 28, 2012, in Proceedings of the National Academy of Sciences.
“Although the [chronic phase] of CML often can be controlled for long periods of time with standard TKI therapies, subsequent genetic and epigenetic alterations promote progenitor expansion and the generation of self-renewing leukemia stem cells that fuel disease progression and blast crisis transformation along with TKI resistance,” wrote study senior author Catriona H. M. Jamieson, MD, PhD, of the University of California, San Diego, and colleagues. They found that increased expression of the ADAR1 p150 isoform in blast crisis CML could be related to inflammatory pathway activation, including cytokines and tumor necrosis factors. The investigators also examined whether limiting expression of ADAR1 could affect the self-renewal capacity of leukemia stem cells. They transplanted human CML cells with ADAR1 expression knocked down into mice and compared with control cells; they found an impaired ability to self-renew in the leukemia stem cells. “Although leukemic burden was not diminished significantly, the [leukemia stem cell] self-renewal capacity was irrevocably reduced by ADAR1 knockdown,” the authors wrote. Together, these data suggest that inflammatory mediator-driven expression of ADAR1 contributes to CML progression. In a press release, Dr. Jamieson noted that this adds further weight to inflammation as “an essential driver of cancer relapse and therapeutic resistance.” In particular, the importance of ADAR1 in CML represents a clear target for therapeutic strategies. “ADAR1 is an enzyme that we may be able to specifically target with a small molecule inhibitor, an approach we have already used effectively with other inhibitors,” Dr. Jamieson said. “If we can block the capacity of leukemia stem cells to use ADAR1, if we can knock down that pathway, maybe we can put stem cells back on the right track and stop malignant cloning.” |
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Note | MELK (Maternal Embryonic Leucine zipper Kinase) belongs to the CAMK serine/threonine protein kinase superfamily. Melk is a protein serine/threonine kinase that is maximally active during mitosis. It is involved in diverse functions such as cell cycle, cytokinesis, mRNA splicing and apoptosis. | |||||
Description | The full-length protein is 651 amino acids with an estimated molecular weight of approximately 74,5 kDa. | |||||
Expression | MELK is expressed in cells of various tissue origins. MELK is highly expressed in oocytes, spermatogonia and embryos, which is indicative of a role in the germ-cell development. MELK is highly expressed in a large panel of cancers MELK expression is dependant on cell transformation (Gray et al., 2005). Its expression is strongly dependant on cell-cycle: MELK is undetectable in cells which have exited cell cycle (Badouel et al., 2010). | |||||
Localisation | Cytoplasm, nucleus and cell cortex. | |||||
Function | The exact function of MELK is currently unknown, however MELK was shown to be involved in cell cycle progression via the protein phosphatase CDC25B phosphorylation (Blot et al., 2002), in cytokinesis (Le Page et al., 2011), in apoptosis via its interaction with the Bcl-2 family of proapoptotic genes (Lin et al., 2007) and apoptosis signal-regulating kinase (ASK1) (Jung et al., 2008) and in inhibition of mRNA splicing during mitosis via its association with NIPP1 (Vulsteke et al., 2004). MELK function is required for mammary tumorigenesis in vivo (Hebbard et al., 2010). | |||||
Homology | MELK belongs to the
Kin1/PAR-1/MARK family of protein kinases found from yeast to human.
These kinases are involved in cell polarity, dynamics of microtubules
and intracellular signalisation. ================================== This kinase is the real deal, Choi S suggested it may confer resistance to 5_FU and Radiation in colorectal cancer. It is located at 9p13 In Breast Cancer, it is bad news (prognosis) because it blocks Apoptosis through Bcl-GL (Fau is an associate). =========================================================== 2. CM2 or Minichromosomal Maintenance Complex, location 3q21 regulated by CDC2 and 7 of which we spoke about as needed for cell division this one initiate genome replication, marking proliferation |
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The Cancer Prevention and Research Institute of Texas Foundation serves
as the connecting link for public policy, community, and business
leaders and is committed to strengthening and expanding the fight
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