Post-graduation Program of Physiology, Instituto de Ciências Básicas da Saúde (ICBS), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.
Department of Biochemistry, Instituto de Ciências Básicas da Saúde (ICBS), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.
Behav Brain Res. 2019 Jul 23;367:189-193. doi: 10.1016/j.bbr.2019.03.048. Epub 2019 Mar 28.
Neonatal hypoxia-ischemia (HI) is responsible for movement disorders in preterm infants. Non-pharmacological strategies, such as environmental enrichment (EE) during adulthood, have shown positive effects on promoting sensorimotor recovery after HI. However, little is known about the effects of perinatal EE on sensorimotor function following HI. In present study we investigated the hypothesis that enriched experiences during pregnancy and lactation would reduce motor impairments caused by a model of neonatal HI in rats. At postnatal day (PND) 3, Wistar pups of both sexes were subject to the modified Rice-Vannucci model. Motor function was evaluated from PND 60 to PND 64. HI caused a reduction in the forepaws strength and worsening of movement quality in the right forepaw. These effects were attenuated in animals receiving prenatal or lactational EE, which showed better performance when compared to the control group. Moreover, enriched experiences during lactation reversed HI-induced asymmetric use of the forepaws and the trend to increased paw errors in a walking test. Lower scores were found in the contralateral forepaw placement in HI animals, except when EE was provided at both stages of neurodevelopment. These results indicate that enriched experiences reduce motor impairments, i.e, measured in force, asymmetry and coordination domains, and that EE during lactation is more effective in promoting post-injury recovery. These data support that early therapeutic interventions might enhance functional reorganization at a period of high brain plasticity and that enriched-like experience might be encouraged in pediatric rehabilitation programs, in order to reduce long-term movement disorders after neonatal brain insults.
新生儿缺氧缺血性(HI)是导致早产儿运动障碍的原因。非药物策略,如成年期的环境丰富(EE),已显示出对促进 HI 后感觉运动恢复的积极影响。然而,对于围产期 EE 对 HI 后感觉运动功能的影响知之甚少。在本研究中,我们假设在妊娠和哺乳期进行丰富的体验将减少新生大鼠 HI 模型引起的运动障碍。在出生后第 3 天(PND),雄性和雌性 Wistar 幼崽均接受改良的 Rice-Vannucci 模型。从 PND 60 到 PND 64 评估运动功能。HI 导致前爪力量下降和右前爪运动质量恶化。接受产前或哺乳期 EE 的动物的这些影响减弱,与对照组相比,这些动物表现更好。此外,哺乳期的丰富经验逆转了 HI 引起的前爪使用不对称和行走测试中爪错误增加的趋势。在 HI 动物中,除了在神经发育的两个阶段都提供 EE 时,在对侧前爪放置中发现得分较低。这些结果表明,丰富的体验可减少运动障碍,即在力量、不对称性和协调性方面的测量,并且在哺乳期提供 EE 更有利于促进损伤后恢复。这些数据表明,早期治疗干预可能会增强大脑高可塑性时期的功能重组,并且在儿科康复计划中鼓励类似丰富的体验,以减少新生儿脑损伤后的长期运动障碍。