Selectivity of action of pregabalin on Ca(2+) channels but not on fusion pore, exocytotic machinery, or mitochondria in chromaffin cells of the adrenal gland.
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Selectivity of action of pregabalin on Ca(2+) channels but not on fusion pore, exocytotic machinery, or mitochondria in chromaffin cells of the adrenal gland. / Hernández-Vivanco, Alicia; Perez-Alvarez, Alberto; Caba-González, José Carlos; Alonso, María Teresa; Moreno-Ortega, Ana José; Cano-Abad, María; Ruiz-Nuño, Ana; Carmona-Hidalgo, Beatriz; Albillos, Almudena.
in: J PHARMACOL EXP THER, Jahrgang 342, Nr. 2, 2, 2012, S. 263-272.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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T1 - Selectivity of action of pregabalin on Ca(2+) channels but not on fusion pore, exocytotic machinery, or mitochondria in chromaffin cells of the adrenal gland.
AU - Hernández-Vivanco, Alicia
AU - Perez-Alvarez, Alberto
AU - Caba-González, José Carlos
AU - Alonso, María Teresa
AU - Moreno-Ortega, Ana José
AU - Cano-Abad, María
AU - Ruiz-Nuño, Ana
AU - Carmona-Hidalgo, Beatriz
AU - Albillos, Almudena
PY - 2012
Y1 - 2012
N2 - The present study was planned to investigate the action of pregabalin on voltage-dependent Ca(2+) channels (VDCCs) and novel targets (fusion pore formed between the secretory vesicle and the plasma membrane, exocytotic machinery, and mitochondria) that would further explain its inhibitory action on neurotransmitter release. Electrophysiological recordings in the perforated-patch configuration of the patch-clamp technique revealed that pregabalin inhibits by 33.4 ± 2.4 and 39 ± 4%, respectively, the Ca(2+) current charge density and exocytosis evoked by depolarizing pulses in mouse chromaffin cells. Approximately half of the inhibitory action of pregabalin was rescued by l-isoleucine, showing the involvement of ?2?-dependent and -independent mechanisms. Ca(2+) channel blockers were used to inhibit Cav1, Cav2.1, and Cav2.2 channels in mouse chromaffin cells, which were unselectively blocked by the drug. Similar values of Ca(2+) current charge blockade were obtained when pregabalin was tested in human or bovine chromaffin cells, which express very different percentages of VDCC types with respect to mouse chromaffin cells. These results demonstrate that the inhibitory action of pregabalin on VDCCs and exocytosis does not depend on ?1 Ca(2+) channel subunit types. Carbon fiber amperometric recordings of digitonin-permeabilized cells showed that neither the fusion pore nor the exocytotic machinery were targeted by pregabalin. Mitochondrial Ca(2+) measurements performed with mitochondrial ratiometric pericam demonstrated that Ca(2+) uptake or release from mitochondria were not affected by the drug. The selectivity of action of pregabalin might explain its safety, good tolerability, and reduced adverse effects. In addition, the inhibition of the exocytotic process in chromaffin cells might have relevant clinical consequences.
AB - The present study was planned to investigate the action of pregabalin on voltage-dependent Ca(2+) channels (VDCCs) and novel targets (fusion pore formed between the secretory vesicle and the plasma membrane, exocytotic machinery, and mitochondria) that would further explain its inhibitory action on neurotransmitter release. Electrophysiological recordings in the perforated-patch configuration of the patch-clamp technique revealed that pregabalin inhibits by 33.4 ± 2.4 and 39 ± 4%, respectively, the Ca(2+) current charge density and exocytosis evoked by depolarizing pulses in mouse chromaffin cells. Approximately half of the inhibitory action of pregabalin was rescued by l-isoleucine, showing the involvement of ?2?-dependent and -independent mechanisms. Ca(2+) channel blockers were used to inhibit Cav1, Cav2.1, and Cav2.2 channels in mouse chromaffin cells, which were unselectively blocked by the drug. Similar values of Ca(2+) current charge blockade were obtained when pregabalin was tested in human or bovine chromaffin cells, which express very different percentages of VDCC types with respect to mouse chromaffin cells. These results demonstrate that the inhibitory action of pregabalin on VDCCs and exocytosis does not depend on ?1 Ca(2+) channel subunit types. Carbon fiber amperometric recordings of digitonin-permeabilized cells showed that neither the fusion pore nor the exocytotic machinery were targeted by pregabalin. Mitochondrial Ca(2+) measurements performed with mitochondrial ratiometric pericam demonstrated that Ca(2+) uptake or release from mitochondria were not affected by the drug. The selectivity of action of pregabalin might explain its safety, good tolerability, and reduced adverse effects. In addition, the inhibition of the exocytotic process in chromaffin cells might have relevant clinical consequences.
KW - Animals
KW - Humans
KW - Mice
KW - Cattle
KW - Calcium/metabolism
KW - Calcium Channel Blockers/pharmacology
KW - Adrenal Glands/drug effects/metabolism
KW - Calcium Channels/metabolism
KW - Chromaffin Cells/drug effects/metabolism
KW - Exocytosis/drug effects
KW - Isoleucine/pharmacology
KW - Membrane Potentials/drug effects
KW - Mitochondria/drug effects/metabolism
KW - Neurotransmitter Agents/metabolism
KW - gamma-Aminobutyric Acid/analogs & derivatives/pharmacology
KW - Animals
KW - Humans
KW - Mice
KW - Cattle
KW - Calcium/metabolism
KW - Calcium Channel Blockers/pharmacology
KW - Adrenal Glands/drug effects/metabolism
KW - Calcium Channels/metabolism
KW - Chromaffin Cells/drug effects/metabolism
KW - Exocytosis/drug effects
KW - Isoleucine/pharmacology
KW - Membrane Potentials/drug effects
KW - Mitochondria/drug effects/metabolism
KW - Neurotransmitter Agents/metabolism
KW - gamma-Aminobutyric Acid/analogs & derivatives/pharmacology
M3 - SCORING: Journal article
VL - 342
SP - 263
EP - 272
JO - J PHARMACOL EXP THER
JF - J PHARMACOL EXP THER
SN - 0022-3565
IS - 2
M1 - 2
ER -
