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Rapid and transient thrombin stimulation of phosphatidylinositol 4,5-bisphosphate synthesis but not of phosphatidylinositol 3,4-bisphosphate independent of phospholipase C activation in platelets
- Source :
- FEBS letters. 330(3)
- Publication Year :
- 1993
-
Abstract
- When platelets are stimulated by thrombin they immediately undergo inositol lipid hydrolysis via phospholipase C activation. However, subsequently an increased production of phosphatidylinositol 4,5-bisphosphate is observed. Phospholipases C were inhibited by lowering the cytoplasmic free calcium concentration by preincubation with Quin-2-tetra(acetoxymethyl) ester. Aggregation and secretion were also totally suppressed. Under these conditions we observed an increased labeling of phosphatidylinositol 4,5-bisphosphate, indicating a stimulation of inositol lipid kinases, independent of lipid hydrolysis by phospholipase C. Conversely the production of phosphatidylinositol 3,4-bisphosphate was totally abolished. These results suggest a different regulation of the kinases/phosphatases responsible for the production of phosphatidylinositol 4,5-bisphosphate and phosphatidylinositol 3,4-bisphosphate.
- Subjects :
- Blood Platelets
Phosphatidylinositol 4,5-Diphosphate
Phosphoinositide kinase
Phosphatidylinositol 3,4-bisphosphate
PLCB2
Biophysics
In Vitro Techniques
Phosphatidylinositols
Biochemistry
chemistry.chemical_compound
Phosphatidylinositol Phosphates
Structural Biology
Phosphoinositide phospholipase C
Genetics
Humans
Inositol
Phosphatidylinositol
Molecular Biology
Cells, Cultured
Phospholipids
Phosphoinositide turnover: Calcium chelator
biology
Chemistry
Hydrolysis
Thrombin
Cell Biology
Enzyme Activation
Kinetics
Phosphatidylinositol 4,5-bisphosphate
Gq alpha subunit
Type C Phospholipases
biology.protein
Aminoquinolines
Phosphoinositide-dependent kinase-1
Subjects
Details
- ISSN :
- 00145793
- Volume :
- 330
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- FEBS letters
- Accession number :
- edsair.doi.dedup.....66cf3f8cf1e54d287c6448420d56ca72