ИСТИНА

Here, we demonstrate for the first time the interaction between adenosine 3′,5′-cyclic monophosphate (cAMP), one of the most important signaling compounds in living organisms, and the mitochondria-targeted antioxidant plastoquinonyl-decyltriphenylphosphonium (SkQ1). The data obtained on model liquid membranes and human platelets revealed the ability of SkQ1 to selectively transport cAMP, but not guanosine 3′,5′-cyclic monophosphate (cGMP), across both artificial and natural membranes. In particular, SkQ1 elicited translocation of cAMP from the source to the receiving phase of a Pressman-type cell, while showing no activity with cGMP. Importantly, only conjugate with plastoquinone, but not dodecyl-triphenylphosphonium (C12TPP), was effective in carrying cAMP. In human platelets, SkQ1 also appeared to serve as a carrier of cAMP, but not cGMP, from outside to inside the cell, as measured by phosphorylation of the vasodilator stimulated phosphoprotein (VASP). The SkQ1-induced transfer of cAMP across the plasma membrane can be tentatively suggested to interfere with cAMP signaling pathways in living cells.