Neonatal Anoxia increases nociceptive response in rats: sex differences and lumbar spinal cord and insula alterations
| Autor: | Ammir Yacoub Helou, Maria Inês Nogueira, Marucia Chacur, Natalia Andrea Cruz-Ochoa, Matheus Cerussi de Souza, Daniel Oliveira Martins, Bruna Arruda |
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| Rok vydání: | 2021 |
| Předmět: |
Male
Nociception medicine.medical_specialty Central nervous system Sensory system Stimulus (physiology) Insular cortex Sex Factors Developmental Neuroscience Internal medicine medicine Animals Insular Cortex Rats Wistar Hypoxia Neurons business.industry RATOS WISTAR Spinal cord Rats Lumbar Spinal Cord Endocrinology medicine.anatomical_structure Spinal Cord Female Nociceptive Stimulus business Developmental Biology |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Neonatal anoxia is a well-known world health problem which results in neurodevelopmental deficits, such as sensory alterations that are observed in patients with cerebral palsy and autism disorder, for which oxygen deprivation is a risk factor. Nociceptive response, as part of the sensory system, has been reported as altered in these patients. To determine whether neonatal oxygen deprivation alters nociceptive sensitivity and promotes medium- and long-term inflammatory feedback in the central nervous system, Wistar rats of around 30 h old were submitted to anoxia (100% nitrogen flux for 25 min) and evaluated on PND23 (postpartum day) and PND90. The nociceptive response was assessed by mechanical, thermal and tactile tests in the early postnatal and adulthood periods. The lumbar spinal cord (SC -L4-L6) motor neurons (MNs) and the posterior insular cortex neurons were counted and compared with their respective controls after anoxia. In addition, we evaluated the possible effect of anoxia on the expression of astrocytes in the spinal cord at adulthood. The results showed increased nociceptive responses in both males and females submitted to anoxia, although these responses were different according to the nociceptive stimulus. A decrease in MNs in adult anoxiated females and an upregulation of GFAP expression in the SC were observed. In the insular cortex, a decrease in the number of cells of anoxiated males was observed in the neonatal period. Our findings suggest that oxygen-deprived nervous systems in rats may affect their response at the sensorimotor pathways and respective controlling centers with sex differences, which were related to the used stimulus. |
| Databáze: | OpenAIRE |
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