Fosfodiesterasas del AMPc y del GMPc en el cerebro: Expresión en procesos neuroinflamatorios y neurodegenerativos

作者: Elisabet Reyes Irisarri

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摘要: Los nucleotidos ciclicos, AMPc y GMPc, estan considerados segundos mensajeros que participan en la transduccion de las vias senalizacion intracelular, contribuyendo esta manera una gran variedad procesos celulares. niveles del regulados por adenilato ciclasa los GMPc guanilato a nivel su sintesis, para ambos fosfodiesterasas, degradacion. Entre fisiologicos involucrados, se ha demostrado participacion reacciones inflamatorias. Niveles elevados ciclicos desencadenan respuestas antiiflamatorias y/o neuroprotectoras, lo tanto, es esperar regulacion enzimas involucrados degradacion, influya indirectamente estos procesos. En este trabajo determinamos expresion ARNm fosfodiesterasas especificas AMPc, como variantes splicing PDE4B el isoenzima PDE7, PDE7B, cerebros controles ratas posteriormente determinar modelos animales con componente inflamatorio (LPS EAE). Por otro lado estudiamos PDE2 PDE9, son capaces hidolizar postmortem humanos control, comparamos pacientes enfermedad Alzheimer. La distribucion cuatro cerebro rata presenta estructuras comun, nucleo anterior olfatorio, o corteza piriforme. Sin embargo existen regiones no encontramos todas isoformas area postrema, donde expresa PDE4B4, diversos tractos materia blanca, hibrida intensamente oligonucleotido PDE4B3 senal PDE4B1, giro dentado hipocampo, solo PDE4B2. Su estudio utilizados revelo un aumento exclusivo PDE4B2 2 3 h despues administracion toxina plexos coroideos modelo animal inflamacion LPS, areas perivasculares EAE. La variante ultimo localizo algunos linfocitos T macrofagos/microglia. El PDE7B localiza largo todo rata, siendo mas abundante cerebrales anteriores, especialmente tuberculo olfativo, caudado-putamen, nucleos talamicos celulas Purkinje cerebelo. En estas preferentemente neuronas glutamatergicas GABAergicas, pero colinergicas. dos isoenzimas PDE7A cambios EAE. Los PDE9 humano cerebral, formacion hipocampal, claustrum caudado putamen. cerebelo PDE2, Purkinje, capa granular dentado. comparacion entre control diagnosticados Alzheimer estudiadas (corteza frontal, diferentes hipocampal) mostro diferencias estadisticamente significativas. " SUMMARY: "cAMP and cGMP fosfodiesterases in brain: Expression neuroinflammatory neurodegenerative processes" cAMP are second messengers involved intracellular signalling pathways, contributing variety of cellular processes. Their synthesis is regulated by adenilyl-cyclase guanilyl-cyclase, their degradation phosphodiesterases. High levels both nucleotides develop antiinfammatory and/or neuroprotective actions, so that, we would expect that the regulation enzymes degradation, phosphodiesterases, will act indirectly those processes. In this work determined cAMP specific phosphodiesterase mRNA expression, variants isozyme, first, rat brain, then model brains EAE) order to determine regulation. We also studied phosphodiesterases hydrolyzing cGMP, post-mortem human comparing with disease patient brains. PDE4B variant distribution brain presents common structures: olfactory nucleus or piriform cortex. However, some regions do not express all isoforms. PDE4B4 expressed postrema; white fibre tracts hybridize for PDE4B1 mRNA, hippocampal dentate gyrus expresses exclusively mRNA. expression our models showed an exclusive increase choroid plexus after toxin administration LPS inflammatory model, perivascular EAE where found cells macrophages/microglia. PDE7B localized along whole abundantly regions: tubercle, caudate-putamen nucleus, hipocampus, thalamic cells. This isoenzyme preferently glutamatergic GABAergic neurons, but cholinergic PDE7 isoenzymes does change brains. PDE2 cerebral cortex, hipocampal formation, caudate putamen nuclei. find cells, granule cerebellar layer cerebellum. When between statistically significant differences. "

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