INVESTIGADORES
GARCIA Daniel Asmed
congresos y reuniones científicas
Título:
Membrane interaction of natural ciclic ketones with inhibitory activity on the GABAA receptor
Autor/es:
SANCHEZ BORZONE, M; DELGADO MARÍN, L; GARCIA, DA
Lugar:
Córdobs
Reunión:
Congreso; 3º Reunión Internacional de Ciencias Farmacéuticas (RICiFa 2014).; 2014
Resumen:
The GABAA receptor (GABA-R) is the main
inhibitory receptor of the Central Nervous System. It possesses binding sites
for drugs other than the neurotransmitter GABA, including benzodiazepines,
barbiturates, and the convulsant picrotoxine which behave as allosteric
modulators or channel blockers. The study of this last site is especially relevant
since it constitutes the action site of widely used neurotoxic organochlorine
pesticides. Our group has studied some cyclic ketones, structurally similar to
the convulsant product thujone,
demonstrating their ability to inhibit the GABA-R activity. Taking into account
that all the ketones studied are highly lipophilic, and considering that
many compounds that regulate GABA-R function are noticeably lipophilic, which
may change the physical properties of the lipid bilayer, in the present work we studied the effect of five
cyclic ketones (including the reference compound thujone) on
the microviscosity of artificial membranes by fluorescence anisotropy. These
studies were completed with the analysis of the cytotoxic activity of these
compounds by using a test that evaluates the membrane integrity (LDH test). The results showed that all the ketones included in
this research were able to modify the membrane microviscosity incrementing the
probes mobility. However, the LDH studies indicated that only one compound
showed cytotoxic effect at higher concentrations and longer exposure times.
Concluding, all compounds are able to interact with the membrane modifying its
properties, although in biological systems the cell could to respond to these
changes to maintain the membrane integrity.