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pubmed-article:12421919pubmed:abstractTextThe leukemic T cell line Jurkat is deficient in protein expression of the lipid phosphatases Src homology 2 domain containing inositol polyphosphate phosphatase (SHIP) and phosphatase and tensin homolog deleted on chromosome ten (PTEN). We examined whether the lack of expression of SHIP-1 and PTEN is shared by other leukemic T cell lines and PBLs. Analysis of a range of cell lines and PBLs revealed that unlike Jurkat cells, two other well-characterized T cell lines, namely CEM and MOLT-4 cells, expressed the 5'-phosphatase SHIP at the protein level. However, the 3-phosphatase PTEN was not expressed by CEM or MOLT-4 cells or Jurkat cells. The HUT78 cell line and PBLs expressed both SHIP and PTEN. Jurkat cells exhibited high basal levels of phosphatidylinositol 3,4,5-trisphosphate (PI(3,4,5)P(3); the lipid substrate for both SHIP and PTEN) as well as saturated protein kinase B (PKB) phosphorylation. Lower levels of PI(3,4,5)P(3) and higher levels of phosphatidylinositol 3,4-bisphosphate (PI(3,4)P(2)) as well as unsaturated constitutive phosphorylation of PKB were observed in CEM and MOLT-4 cells compared with Jurkat cells. In PBLs and HUT78 cells which express both PTEN and SHIP-1, there was no constitutive PI(3,4,5)P(3) or PKB phosphorylation, and receptor stimuli were able to elicit robust phosphorylation of PKB. Expression of a constitutively active SHIP-1 protein in Jurkat cells was sufficient to reduce both constitutive PKB membrane localization and PKB phosphorylation. Together, these data indicate important differences between T leukemic cells as well as PBLs, regarding expression of key lipid phosphatases. This study provides the first evidence that SHIP-1 can influence the constitutive levels of PI(3,4,5)P(3) and the activity of downstream phosphoinositide 3-kinase effectors in T lymphocytes.lld:pubmed
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pubmed-article:12421919pubmed:articleTitleEvidence that SHIP-1 contributes to phosphatidylinositol 3,4,5-trisphosphate metabolism in T lymphocytes and can regulate novel phosphoinositide 3-kinase effectors.lld:pubmed
pubmed-article:12421919pubmed:affiliationDepartment of Pharmacy and Pharmacology, Bath University, Claverton Down, Bath, BA2 7AY, UK.lld:pubmed
pubmed-article:12421919pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:12421919pubmed:publicationTypeComparative Studylld:pubmed
pubmed-article:12421919pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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