Cell Cycle-dependent Regulation of Pyrimidine Biosynthesis

Microtubule-dependent cell cycle regulation

Interstitial cells of Hydra attenuata, from which nerve cells and nematocytes (stinging cells) differentiate, were arrested in either metaphase or G2 by different concentrations of the microtubule-depolymerizing agent nocodazole. At a concentration of 1*4 nM-nocodazole, a large number of cells were arrested in metaphase. However, at concentrations of 2 nM-nocodazole and above most of the cells ...

Cholesterol Biosynthesis and Homeostasis in Regulation of the Cell Cycle

The cell cycle is a ubiquitous, multi-step process that is essential for growth and proliferation of cells. The role of membrane lipids in cell cycle regulation is not explored well, although a large number of cytoplasmic and nuclear regulators have been identified. We focus in this work on the role of membrane cholesterol in cell cycle regulation. In particular, we have explored the stringency...

Regulation of Pyrimidine Biosynthesis in Intact Cells of Cucurbita pepo.

The occurrence of the complete orotic acid pathway for the biosynthesis de novo of pyrimidine nucleotides was demonstrated in the intact cells of roots excised from summer squash (Cucurbita pepo L. cv. Early Prolific Straightneck). Evidence that the biosynthesis of pyrimidine nucleotides proceeds via the orotate pathway in C. pepo included: (a) demonstration of the incorporation of [(14)C]NaHCO...

Cell cycle-dependent regulation of smooth muscle cell activation.

OBJECTIVE Although numerous diseases involving cellular proliferation are also associated with phenotypic changes, there has been little direct evidence that cell phenotype and the cell's response to external stimuli are modified during passage through different phases of the cell cycle. In this study, we demonstrate that an association exists between cell cycle progression and the expression o...

Characterization of Pyrimidine Biosynthesis