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• W2127341411 abstract "There is much evidence that dietary Ca2+ loading reduces colon cell proliferation and carcinogenesis in humans and rodents, but during carcinogenesis it becomes ineffective or even tumor-promoting. We are beginning to see how Ca2+ balances the continuous massive cell production in colon crypts by driving the terminal differentiation and eventually the apoptosis of the cells mainly on the mucosal surface, and how this Ca2+ control is lost during colon carcinogenesis. The rapid proliferation of the transit-amplifying (TA) progeny of the colon stem cells is driven by the so-called “Wnt” signaling mechanism, which involves the stimulation of proliferogenic genes such as those for c-Myc and cyclin D1 and the silencing of the gene for the cell cycle-stopping p21Cip1/WAF1 protein by nuclear β-catenin • Tcf-4 complexes. TA cells avoid mitotic damage and premature apoptosis by expressing the protein survivin. It appears that TA cell cycling stops and terminal differentiation starts when the cells reach a higher level in the crypt where there is enough lumenal Ca2+ to stimulate the expression and activation of CaSRs (Ca2+-sensing receptors), the signals from which stimulate the expression of E-cadherin. Along with this, the APC (adenomatous polyposis coli) protein appears and some of it enters the nucleus. There it makes the TA cells susceptible to the eventual apoptotic balancing by stopping survivin expression and the β-catenin • Tcf-4 complex from driving further cell cycling by releasing β-catenin from the nucleus, and delivering it to cytoplasmic APC • axin • GSK-3β complexes for ultimate proteasomal destruction. Cytoplasmic β-catenin is then prevented from returning to the nucleus by either being intercepted and destroyed by APC • axin • GSK-3β complexes or locked by the emerging E-cadherin into membrane adherens junctions which tie the cell into the sheet of proliferatively shut-down cells with APC-dependent cytoskeletons moving to the mouth of the crypt and onto the flat mucosal surface. A common first step in sporadic colon carcinogenesis is the loss of functional APC which disorients upwardly directed migration and causes the retention of nuclear β-catenin and proliferogenic β-catenin • Tcf-4 complexes as well as genomic instability. Eventually the balance between cell proliferation and terminal differentiation and death is radically tipped in favour of proliferation by the appearance of apoptosis-resistant, survivin-expressing clones of Ca2+-insensitve cells which are locked into the proliferative, mutation-prone mode because of CaSR-disabling gene mutations which prevent the stimulation of E-cadherin expression and terminal differentiation." @default.
• W2127341411 created "2016-06-24" @default.
• W2127341411 creator A5016390620 @default.
• W2127341411 date "2009-03-01" @default.
• W2127341411 modified "2023-10-18" @default.
• W2127341411 title "Calcium, calcium-sensing receptor and colon cancer" @default.
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• W2127341411 doi "https://doi.org/10.1016/j.canlet.2008.07.001" @default.
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• W2127341411 hasPublicationYear "2009" @default.
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