It is shown that L-carnitine strongly increases the ability of rat liver mitochondria to respond to the train of Ca2+ additions by a transient stimulation of the State-4 respiration rate. Such an effect requires ATP and the L-carnitine efficiency strongly decreases when ATP is omitted. Oleate influences the mitochondria in a fashion opposite to that of L-carnitine. The oleate effect is strongly diminished by L-carnitine. Again, the L-carnitine effect requires ATP, and D-carnitine fails to substitute for L-carnitine. It is suggested that L-carnitine removes, in an ATP-dependent manner, endogenous or added fatty acids, which are involved in oxidative damage of Ca(2+)-loaded mitochondria.

The protecting effect of L-carnitine on Ca(2+)-loaded rat liver mitochondria / Mokhova, E; Arrigoni Martelli, E; Bellei, Monica; Dedukhova, V; Muscatello, U; Starkov, A; Bobyleva, V.. - In: FEBS LETTERS. - ISSN 0014-5793. - STAMPA. - 289(1991), pp. 187-189.

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