Differential effect of alkyl chain-modified ether lipids on protein kinase C autophosphorylation and histone phosphorylation

Carles Gil, Elena Molina, Maria Plana, Assumpta Carabaza, Francesc Cabré, David Mauleón, Germano Carganico, Emilio Itarte

Research output: Contribution to journalArticleResearchpeer-review

5 Citations (Scopus)

Abstract

Analogues of 1-O-octadecyl-2-O-methyl-rac-glycerol-3-phosphocholine (ET-18-OMe), containing a carbonyl group at different positions in the alkyl chain and/or a pentylammonium group in sn-3 of glycerol, were evaluated as inhibitors of protein kinase C (PKC; EC 2.7.1.37). The presence of a carbonyl group in the alkyl chain of Et-18-OMe had a dual role in decreasing the inhibitory effect on histone phosphorylation and activating this reaction at low concentrations of compound. The optimal stimulatory effect was observed with the compound having the carbonyl function in C-7 of the alkyl chain. In contrast, all of these compounds were only inhibitors of PKC autophosphorylation, its potency decreasing progressively with the distance between the carbonyl group and the sn-1 position of glycerol. Replacement of the phosphocholine group of ET-18-OMe by a pentamethylene trimethylammonium group maintained the inhibitory effect on histone phosphorylation and autophosphorylation of PKC, and the simultaneous introduction of a ketone group in C-7 of the alkyl chain did not decrease any of these effects. The effects of all these analogues on PKC autophosphorylation, but not on histone phosphorylation, correlated quite well with their known antiproliferative activity on human tumor cell lines and membranolytic activity.
Original languageEnglish
Pages (from-to)1843-1847
JournalBiochemical Pharmacology
Volume52
Issue number12
DOIs
Publication statusPublished - 24 Dec 1996

Keywords

  • alkyl lysophospholipids
  • autophosphorylation
  • histone phosphorylation
  • protein kinase C

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