Low-density lipoproteins increase intracellular calcium in aequorin-loaded platelets

Low-density lipoproteins activate isolated human platelets. The mechanism of this activation is unknown, but may involve increased phosphoinositide turnover. We have examined the effect of low-density lipoproteins on intracellular calcium concentrations in platelets loaded with the photoprotein aequ...

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Veröffentlicht in:FEBS letters 1988-10, Vol.238 (2), p.357-360
Hauptverfasser: Dunn, R.C., Schachter, M., Miles, C.M.M., Feher, M.D., Tranter, P.R., Bruckdorfer, K.R., Sever, P.S.
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Sprache:eng
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Zusammenfassung:Low-density lipoproteins activate isolated human platelets. The mechanism of this activation is unknown, but may involve increased phosphoinositide turnover. We have examined the effect of low-density lipoproteins on intracellular calcium concentrations in platelets loaded with the photoprotein aequorin. The lipoproteins induced concentration-dependent increases in intracellular calcium, associated with shape change and aggregation. These responses could be partially inhibited by the removal of extracellular calcium and by pre-incubation with acetylsalicylic acid. They were also antagonised by agents which increase cellular concentrations of cyclic adenosine and guanosine monophosphates. It is not clear whether the platelet-lipoprotein interaction involves a ‘classical’ lipoprotein receptor.
ISSN:0014-5793
1873-3468
DOI:10.1016/0014-5793(88)80512-X