Mitochondrial impairment and cytotoxicity effects induced by the marine epibenthic dinoflagellate Coolia malayensis.

Mitochondria was used to clarify the effects of Coolia malayensis strain UNR-02 crude extract by studying mitochondrial membrane potential (DeltaPsim) generation and the fluctuations of DeltaPsim associated with the induction of mitochondrial permeability transition (MPT). The cytoxicity of C. malayensis was also determined using both HepG2 and H9c2(2-1) cells. C. malayensis extract significantly depressed the oxidative phosphorylation efficiency, as was inferred from the perturbations in DeltaPsim and in the phosphorylative cycle induced by ADP. Increased susceptibility to Ca(2+)-induced MPT was also observed. At the cellular level, the extract significantly decreased cell mass of both cell lines.