[A new fluorescent analogue for the investigation of anandamide transport in cell cultures].

For the first time a new fluorescent analogue of anadamide incorporating BODIPY®-FL-fluorophore, attached to arachidonic acid via 2,2'-(ethylenedioxy)-bis(ethylenediamine), was prepared. Using rat glioma C6 cells it was demonstrated that the fluorescent analogue is a substrate of the cellular anandamide uptake system (Km 4.5 ± 0.

[GABA-ergic mechanism of cerebrovascular and antiischemic effects of docosahexaenoic acid].

In experiments on rats, measurements of the local blood flow in the cortex of cerebrum with the aid of a laser Doppler flow meter showed that docosahexaenoic acid (DHA) enhanced the local cerebral circulation in animals with global transient cerebral ischemia, while not influencing that in intact animals. This vasodilatory effect of DHA in ischemized rats is blocked by bicuculline (specific GABA(A) receptor blocker), which is indicative of a GABA-ergic mechanisms of the vascular tone regulation. The results of radioligand binding assay in vitro showed the possibility of direct DHA interaction with cerebrovascular GABA(A) receptors.

[The influence of docosahexaenoic acid moiety on cytotoxic activity of 1,2,4-thiadiazole derivatives].

Among 3-(2-aminopropyl)-1,2,4-thiadiazole derivatives contatining substitution-ready secondary amino group and exhibiting cytotoxic towards rat C 6 glioma cells three compounds with LD 50 values ranged from 6 to 48 мM were chosen. For these compounds amides with docosahexaenoic acid were synthetised and their cytotoxic activity was studied. It was shown that, although docosahexaenoic acid itself was not toxic for C 6 glioma cells, its addition to the amino derivatives of 1,2,4-thiadiazole increased or decreased resultant cytotoxicity.

[Antiaggregation activity of arachidonic acid conjugates with neurotropic peptides proglyprol and semax].

The influence two original derivatives of a therapeutically important peptide, bearing arachidonic acid residue with semax and proglyprol, upon platelet aggregation have been studied in vitro. It is established that both derivatives, in contrast to the parent peptide, possess moderate anti-aggregant properties and produce a dose-dependent decrease in the interplatelet interaction induced by ADP, epinephrine, and arachidonic acid within the concentration range of 0.018 - 1.

[Cerebrovascular effects of GABA-prostaglandin E2 conjugate in comparison with prostaglandin E2].

Experiments have shown that GABA conjugate with prostaglandin E2 enhances cerebral blood flow in rats after global transient ischemia, while not affecting the cerebral hemoperfusion in intact animals. It is established that cerebrovascular activity of the GABA conjugate with prostaglandin E2 under conditions of cerebral ischemia is based on GABAergic mechanisms of vascular tone regulation, since it is removed by GABA(A)-receptor blocker bicuculline. At the same time, cerebral blood flow of intact rats and rats after global transient ischemia of brain is equally enhanced by prostaglandin E2 alone.