Mar 22, 2008

Alteration in protein kinase B (AKT) activity in platelets from patients with systemic sclerosis

Thrombosis Research
Thomas M Chiang, Arnold E Postlethwaite


We have previously reported that there is an increase in phosphotidylinositide-3 kinase activity secondary to increase in nitrotyrosylation in platelets from patients with SSc. Protein kinase B (Akt) is recruited to the plasma membrane by PI 3-K metabolites. Both enzymes play critical roles in signal transduction and activation of platelets. In the present investigation, we have studied the effect of postranslational modification of the activity of Akt. We have examined eight patients and eight controls and obtained results showing that enzymatic activity of Akt is increased in lysates of platelets from patients with SSc compared to normal volunteer controls. We have obtained results showing that there is no correlation of nitrotyrosylation of Akt on its enzymatic activity although Western blots show the enzyme has increased nitrotyrosylation. These results suggest that post-translational modification by nitrotyrosylation does not control Akt in SSc platelets. We concluded that the enhanced activity of PI 3-K and Akt in platelets from patients with SSc is mediated by different mechanisms.

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Mentioned in this Paper

Immunoblotting, Reverse
Platelet Aggregation Measurement
Phosphatidylinositol 3-Kinases
Pellet Formation
Enzymes, antithrombotic
Post-Translational Protein Processing
Western Blotting
Protein Phosphorylation

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