Fig. 3.
Detection of [32P]lysophospholipids in [32P]orthophosphate-labeled platelets.
Human platelets labeled with [32P]orthophosphate were incubated without (−) or with 1 U/mL of thrombin (Thr), 20 μg/mL of collagen (Col), or 5, 10, or 20 μmol/L Sph for 5 minutes. Sph-1-P and LPA were first extracted from these platelets into the upper aqueous phase under alkaline conditions, followed by re-extraction into the lower chloroform phase under acidic conditions. The final chloroform phase was analyzed by TLC autoradiography.