Words similar to cycle-dependent
Example sentences for: cycle-dependent
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p27 specifically inhibits CDKs, which mediate entry into S phase [ 10 11 ] . The level of p27 is higher in quiescent than in proliferating cells, and this increase in p27 abundance is required for an effective cell cycle exit [ 12 ] . The cell cycle-dependent variations in p27 levels are not reflected by similar changes in p27 mRNA [ 13 ] . Many aggressive prostate cancers display decreased p27 protein levels in the presence of high p27 mRNA [ 14 ] , suggesting that p27 depletion may result from ectopic proteolysis.
These findings indicated that cell cycle-dependent substrate degradation is unlikely to be controlled at the level of SCF Pop1p-Pop2pcomplex formation.
One of the major cellular serine/threonine protein phosphatases is protein phosphatase type 1 (PP1) [ 1 ] . An abundant enzyme expressed in all cells, complex regulation of PP1 is thought to be essential for proper temporal and spatial regulation of PP1 catalytic activity towards individual substrates [ 2 ] . Three different isotypes of the catalytic subunit, designated PP1α, PP1δ, and PP1γ1, are expressed in many different cell types [ 3 ] . Studies employing many eukaryotic systems all point to a crucial role for PP1 activity in controlling cell cycle progression, and an absolute requirement of this activity for mitotic exit [ 4 5 6 7 ] . There is also evidence to suggest that phosphorylation of PP1 and its associated proteins by the cyclin-dependent kinases may regulate PP1 activity in a cell cycle stage-dependent manner [ 8 9 10 ] . Hence, current efforts are directed towards identification of cell cycle-dependent substrates for PP1, and how regulation of PP1 activity towards these substrates controls the cell division cycle.
It has previously been shown that IL-8 mRNA induction was seen less then 1 h after Tat (72aa) stimulation, and levels remained elevated for up to 24 h, leading to IL-8 protein production [ 102 ] . Along these lines, we have previously shown that the IL-8 gene is expressed in a cell cycle-dependent manner in cells that express the Tat protein, and the induction is during the S phase of the cell cycle and regulated by stable NF-kB binding to the IL-8 promoter [ 103 ] . When looking for IL-8 at the G1/S border, we found that all Tat containing cells, including PBMCs that were treated with exogenous Tat showed an up-regulation of IL-8 in the supernatant (Figure 4), further implying that results obtained from the H9/Tat system may infact be of general physiological relevance in vivo.
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