Abstract:
:Stimulation of platelets induces a rapid release of arachidonate from specific phospholipids and subsequent remodeling of arachidonate-containing phospholipids. This process is accompanied by transformation of released arachidonate by cyclooxygenase and lipoxygenase enzymes. We addressed the question of whether the cyclooxygenase and the lipoxygenase products originated from the same arachidonate-containing phospholipids. [14C]Arachidonate prelabeled platelets were stimulated by thrombin or by ionophore A 23187. We monitored the cyclooxygenase pathway by following 12-hydroxy-5,8,10-heptadecatrienoic acid [12(S)-HHT] formation and the lipoxygenase pathway by following 12-hydroxy-5,8,10,14-eicosatetraenoic acid [12(S)-HETE] formation and compared specific activities. The data showed that the same pool of released arachidonate can be utilized by either cyclooxygenase or by lipoxygenase. Indeed, the specific activity of both products was identical when both enzymes were acting. Since cyclooxygenase was rapidly deactivated while lipoxygenase continued to be active, the specific activity of 12(S)-HETE became lower than the specific activity of 12(S)-HHT when large amounts of 12(S)-HETE were synthesized. Based on comparison of specific activity between phospholipids and oxygenated products, the pools of arachidonate-containing phospholipids involved in the synthesis of oxygenated products are dependent on the amount of arachidonate released.
journal_name
Lipidsjournal_title
Lipidsauthors
Chevy F,Wolf C,Colard Odoi
10.1007/BF02536506subject
Has Abstractpub_date
1991-12-01 00:00:00pages
1080-5issue
12eissn
0024-4201issn
1558-9307journal_volume
26pub_type
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