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A Piglet Model of Neonatal Hypoxic-Ischemic Encephalopathy
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Deficiencia serotoninérgica del tronco encefálico en el síndrome de muerte súbita infantil
Jhodie R Duncan1, David S Paterson, Jill M Hoffman
1Department of Pathology, Children's Hospital Boston, 300 Longwood Ave, Boston, MA 02115, USA.
JAMA
|February 4, 2010
Resumen
El síndrome de muerte súbita infantil (SIDS) está relacionado con niveles más bajos de serotonina (5-HT) y triptófano hidroxilasa (TPH2) en el tronco cerebral. Esto sugiere que un trastorno por deficiencia de serotonina puede contribuir al SIDS.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- La bioquímica es la bioquímica.
- La pediatría es la medicina de los niños.
Sus antecedentes:
- Se hipotetiza que el síndrome de muerte súbita infantil (SIDS) se deriva de un deterioro del control del tronco cerebral de las funciones autónomas y la respiración.
- Estudios previos sugieren anomalías en la unión al receptor de serotonina (5-hidroxitriptamina [5-HT]) en la médula oblonga de los bebés con SMSL.
Objetivo del estudio:
- Investigar si las anomalías de los receptores de 5-HT en los bebés con SMSL están asociadas con niveles reducidos de 5-HT, su enzima sintetizadora triptófano hidroxilasa (TPH2), o ambas.
Principales métodos:
- En un estudio de autopsia se analizó el 5-HT, su metabolito ácido 5-hidroxiindoleacético (5-HIAA), los niveles de TPH2 y la unión al receptor 5-HT1A en los núcleos medulares.
- El estudio incluyó 41 casos de SIDS y los comparó con 7 bebés con muerte aguda por causas conocidas y 5 bebés hospitalizados con hipoxia-isquemia crónica.
Principales resultados:
- Los casos de SMSL mostraron niveles de 5-HT significativamente más bajos en el raphé obscurus y el paragigantocellularis lateralis (PGCL) en comparación con los controles.
- Los niveles de TPH2 también se redujeron en el raphé obscurus de los bebés con SMSL.
- La unión al receptor 5-HT ((1A) se redujo en varios núcleos medulares en casos de SMSL, con una disminución relacionada con la edad observada en algunas regiones.
Conclusiones:
- La SMSL se asocia con niveles reducidos de 5-HT y TPH2 en la médula.
- Estos hallazgos apoyan la hipótesis de un trastorno de deficiencia de serotonina medular que contribuye al SMSL.
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