Words similar to prb
Example sentences for: prb
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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.
The difference in the level of hypophosphorylated pRb pocket protein isoforms between the two cell lines treated with SAHA may be attributed to differences in G1 and S phase cdk activity (examined in the following section).
Our second approach involved testing immunopurified 6His-HA-PP1α for its ability to dephosphorylate the growth suppressor protein pRB.
One physiological substrate for PP1 appears to be the product of the retinoblastoma susceptibility gene, pRB [ 11 12 13 ] , a demonstrated tumor suppressor.
Inhibition of cell cycle by p27 and p21 is complemented by retinoblastoma protein pRb, and other cell cycle inhibitors (tumor suppressor proteins) [ 30 31 32 ] . In reality, besides their role in the regulation of the cell cycle, the cdk inhibitors, in association with D-type cyclins, cyclin E, and cdk2, play a direct role in the stimulation of epithelial cell differentiation [ 33 ] . p27 is also transiently expressed in developing myotomes and enhances myogenesis [ 34 ] .
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