2012, Número 5
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Salud Mental 2012; 35 (5)
Regulación de la liberación de serotonina en distintos compartimientos neuronales
Trueta C, Cercós MG
Idioma: Español
Referencias bibliográficas: 95
Paginas: 435-443
Archivo PDF: 169.66 Kb.
RESUMEN
La serotonina es fundamental para la modulación de la conducta social,
las emociones y una gran cantidad de funciones fisiológicas. La
función de los sistemas serotonérgicos se ha conservado a lo largo
de la escala evolutiva y, en general, números pequeños de neuronas
inervan prácticamente todo el Sistema Nervioso. Estas neuronas son
capaces de ejercer múltiples efectos, dependiendo de si liberan serotonina
de pozas sinápticas, que ejercen efectos rápidos y locales
o de pozas extrasinápticas en la periferia de las sinapsis, el axón, el
cuerpo celular o las dendritas, con lo que se producen efectos lentos
y difusos, característicos de los estados de ánimo. La liberación de
serotonina en las terminales sinápticas es producida por la exocitosis
de vesículas claras pequeñas y se activa con impulsos sencillos o a
baja frecuencia. La estimulación con trenes de impulsos a frecuencias
crecientes produce facilitación y depresión sináptica. En contraste,
la liberación a partir del soma es producida por la exocitosis de
vesículas de núcleo denso y requiere de la estimulación a frecuencias
altas, la activación de canales de calcio tipo L y de la liberación de
calcio de los depósitos intracelulares. La serotonina liberada por las
terminales sinápticas activa de manera inmediata autorreceptores en
las propias terminales que la liberaron, disminuyendo la excitabilidad
subsiguiente y, por lo tanto, la frecuencia de disparo y la liberación
de manera localizada. La regulación diferencial de la liberación en
cada compartimiento celular permite que la misma neurona produzca
diferentes tipos de efectos dependiendo de la frecuencia de disparo.
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