Excitatory superficial dorsal horn interneurons are functionally heterogeneous and required for the full behavioral expression of pain and itch.
Neuron
; 78(2): 312-24, 2013 Apr 24.
Article
en En
| MEDLINE
| ID: mdl-23622066
ABSTRACT
To what extent dorsal horn interneurons contribute to the modality specific processing of pain and itch messages is not known. Here, we report that loxp/cre-mediated CNS deletion of TR4, a testicular orphan nuclear receptor, results in loss of many excitatory interneurons in the superficial dorsal horn but preservation of primary afferents and spinal projection neurons. The interneuron loss is associated with a near complete absence of supraspinally integrated pain and itch behaviors, elevated mechanical withdrawal thresholds and loss of nerve injury-induced mechanical hypersensitivity, but reflex responsiveness to noxious heat, nerve injury-induced heat hypersensitivity, and tissue injury-induced heat and mechanical hypersensitivity are intact. We conclude that different subsets of dorsal horn excitatory interneurons contribute to tissue and nerve injury-induced heat and mechanical pain and that the full expression of supraspinally mediated pain and itch behaviors cannot be generated solely by nociceptor and pruritoceptor activation of projection neurons; concurrent activation of excitatory interneurons is essential.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Dolor
/
Prurito
/
Raíces Nerviosas Espinales
/
Receptores de Hormona Tiroidea
/
Receptores de Esteroides
/
Interneuronas
Tipo de estudio:
Etiology_studies
Límite:
Animals
Idioma:
En
Revista:
Neuron
Asunto de la revista:
NEUROLOGIA
Año:
2013
Tipo del documento:
Article
País de afiliación:
Estados Unidos