The intracellular concentrations of polyphosphoinositides and inositol phosphates were determined, and their role in growth factor-initiated cell division was investigated in a Chinese hamster ovary cell inositol auxotroph (CHO-K1-Ins). Metabolic labeling experiments during inositol starvation of CHO-K1-Ins cells showed that 1) the lipid-linked inositol component was maintained at the expense o...

Thrombopoietin and its receptor (Mpl) support survival and proliferation in megakaryocyte progenitors and in BaF3 cells engineered to stably express Mpl (BaF3/Mpl). The binding of thrombopoietin to Mpl activates multiple kinase pathways, including the Jak/STAT, Ras/Raf/MAPK, and phosphatidylinositol 3-kinase pathways, but it is not clear how these kinases promote cell cycling. Here, we show tha...

CD1d1 is a member of a family of lipid Ag-presenting molecules. The cellular ligands associated with CD1d1 were isolated and characterized by biochemical means as an approach to elucidate the mechanism by which CD1 molecules assemble in vivo. Natural ligands of mouse CD1d1 included cellular phosphatidylinositol and phosphatidylinositol-glycans that are synthesized in the endoplasmic reticulum. ...

The Fab1 protein is a phosphatidylinositol 3-phosphate 5-kinase involved in yeast stress response and membrane trafficking. New evidence indicates that the Vac14 protein, like Vac7p, regulates phosphatidylinositol 3,5-bisphosphate levels and possibly Fab1p activity.

The original online version of this article (Guo, R., Wang, X., Zhang, R., Shi, H., Qiao, Y., Yun, W., Ge, Lin, Y. and Lei, J. (2015) Response Subcutaneous Xenografts of Endometrial Cancer in Nude Mice to Inhibitors Phosphatidylinositol 3-Kinase/Akt Mitogen-Activated Protein Kinase (MAPK) Pathways: An Effective Therapeutic Strategy for Endometrial Cancer. Journal Therapy, 6, 1083-1092. htt...

The original online version of this article (Guo, R., Wang, X., Zhang, R., Shi, H., Qiao, Y., Yun, W., Ge, Lin, Y. and Lei, J. (2015) Response Subcutaneous Xenografts of Endometrial Cancer in Nude Mice to Inhibitors Phosphatidylinositol 3-Kinase/Akt Mitogen-Activated Protein Kinase (MAPK) Pathways: An Effective Therapeutic Strategy for Endometrial Cancer. Journal Therapy, 6, 1083-1092. htt...

1. We have developed methods that yield estimates of the 32p content of each of the individual phosphate groups of phosphatidylinositol 4-phosphate and phosphatidylinositol 4,5-bisphosphate, thus extending the information available from studies of the labelling of these lipids in intact cells or membrane preparations. The analyses are undertaken with the deacylated lipids. 2. Assay of the 5-pho...

The four mammalian phosphatidylinositol 4-kinases modulate inter-organelle lipid trafficking, phosphoinositide signalling and intracellular vesicle trafficking. In addition to catalytic domains required for the synthesis of PI4P, the phosphatidylinositol 4-kinases also contain isoform-specific structural motifs that mediate interactions with proteins such as AP-3 and the E3 ubiquitin ligase Itc...

To help elucidate the possible role of phosphatidylinositol in the regulation of membrane permeability to Ca2+, the relationship in the rat parotid gland of phosphatidylinositol turnover to hormone receptor binding and to the hormone-mediated increase in K+ permeability (a Ca2+-dependent phenomenon) was investigated. The concentrations of adrenaline and substance P required to stimulate phospha...