It has recently been demonstrated by our group that polymorphonuclear cells (PMNs) from cluster headache patients incorporate more arachidonic acid (AA) into phosphatidylserine (PS) than PMNs from controls. In the present report, the incorporation of L-(U-14C)serine into PS in PMNs from 14 healthy volunteers and 12 cluster headache patients was studied. PMNs from controls incorporated 1194 +/- 578 (mean +/- SD) cpm of L-(U-14C)serine into PS, 268 +/- 292 cpm into phosphatidylethanolamine, and 57 +/- 71 cpm into sphingomyeline. The corresponding figures in cluster headache patients were 2365 +/- 841 cpm, 291 +/- 207 cpm, and 88 +/- 66 cpm, respectively. Incorporation of L-(U-14C)serine into PS was significantly increased (p less than 0.0004) in PMNs from cluster headache patients, whereas no significant difference was seen in other lipids. The results confirm that patients with cluster headache have an increased incorporation of precursors into PS in isolated PMNs, and they indicate that this is due to an increased de novo synthesis of PS.
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