Example sentences for: down-regulate

How can you use “down-regulate” in a sentence? Here are some example sentences to help you improve your vocabulary:

  • In comparison to the two general alternative mechanisms utilized by known transforming viruses to promote cell-cycle progression, namely, by activating or bypassing endogenous D-type cyclins (herein, referred to as "cyclin D"), it has not been established whether HIV-1 gene products trigger either cyclin D-dependent or cyclin D-independent proliferation in non-lymphoid tissues [ 15 ] . In infected renal epithelium, HIV-1 could disrupt the inhibitory binding of pRb to E2F independent of endogenous cyclin D, analogous to transforming viral mechanisms that bypass and down-regulate endogenous cyclin D, such as SV-40 T antigen binding to pRb [ 16 ] , HHV-8 v -cyclin binding to and activating cyclin-dependent kinase-6 (CDK) [ 17 ] , and activation of cyclin E by EBV-induced c -myc [ 18 ] . Alternatively, HIV-1 could activate cyclin D-dependent proliferation, as exemplified by RSV v -src-mediated signaling [ 19 ] . In most tissues, the selective activation of these cell-cycle pathways is readily discernable.

  • It should be noted that the fibroblast cells lines we used remain fully viable after detachment and transfer to suspension culture [ 31 43 ] . This is in contrast to most epithelial cells which undergo anoikis, i.e., apoptotic cell death after the disruption of cell-matrix interactions [ 45 ] . It is of interest that some anchorage-independent tumor cells, most of which are of epitheloid origin, become susceptible to anoikis after the introduction of exogenous PTEN [ 23 34 35 36 ] . These observations are in line with the established ability of PTEN to down-regulate the phosphatidylinositol 3-kinase (PI3-K)/PKB survival pathway [ 11 46 ] . The absence of anoikis in our two cell lines may reflect inherent cell type specific differences, i.e., the superior ability of fibroblasts to survive under suspension culture conditions.

  • First, PTEN's protein phosphatase activity is able to down-regulate focal adhesion kinase (FAK) phosphorylation, which leads to the inactivation of the Ras/MAP kinase pathway [ 19 20 21 ] . Second, its lipid phosphatase activity targets the second messenger phosphatidylinositol 3,4,5-trisphosphate [PtdIns(3,4,5)P 3 ] and thereby blocks activation of the protein kinase B (PKB/Akt) pathway [ 11 18 22 23 24 ] . Whereas both of the above pathways are intimately involved in the control of cell growth and survival, PTEN-regulated FAK activity further appears to impinge on cell adhesion, cell migration, and cell invasion [ 20 21 ] . It therefore emerges that the loss of PTEN activity may confer increased survival ability, proliferative potential, and invasive capacity on cells, and thereby may promote progression towards a more malignant phenotype.

  • 10) have various expression levels of doubly spliced viral mRNAs, including Tat, Rev, Nef, Vpr, and other accessory proteins, we decided to perform the microarray in a system where Tat was constitutively expressed; asking whether Tat by itself, or in the absence of other accessory proteins, could still down-regulate host cellular genes.

  • Indeed, the use of a constitutively active mutant of PP1 has already been shown to result in pRB-dependent G1 arrest in human cancer cells [ 22 ] . Placing this mutant into the inducible expression system described here has the potential to down-regulate expression of wild-type endogenous PP1.


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