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Early intensive rehabilitation reverses locomotor disruption, decrease brain inflammation and induces neuroplasticity
Eduardo Sanches1, Dini Ho1, Yohan van de Looij2
1Division of Child Development and Growth, Department of Pediatrics, School of Medicine, University of Geneva, Geneva, Switzerland.
Insights
Intensive sensorimotor rehabilitation using environmental enrichment and treadmill training improved motor function in a cerebral palsy model. This approach reduced brain inflammation and enhanced neurotrophin signaling, promoting neurological recovery.
Area of Science:
- Neuroscience
- Developmental Biology
- Rehabilitation Medicine
Background:
- Cerebral Palsy (CP) is a leading cause of pediatric motor and cognitive disability resulting from early brain injury.
- Early intensive sensorimotor rehabilitation can improve brain structure and reduce CP symptom severity.
- This study investigates a combined environmental enrichment and treadmill training (EETT) approach for CP recovery.
Purpose of the Study:
- To evaluate the efficacy of a one-week sensorimotor stimulation program (EETT) in a rat model of cerebral palsy.
- To explore the underlying mechanisms of functional recovery following EETT.
- To assess the impact of EETT on neuroinflammation, myelination, and synaptic function.
Main Methods:
- A CP model was induced in Wistar rats using LPS and anoxia, followed by hindlimb restriction.
- The EETT program involved treadmill training and environmental enrichment from P21 to P27.
- Functional outcomes were assessed via kinematic gait analysis, with ex-vivo MRI, histology, and western blotting used for mechanistic studies.
Main Results:
- The CP model exhibited significant locomotor deficits and altered central nervous system (CNS) neurochemistry.
- EETT successfully reversed locomotor dysfunction and improved gait kinematics.
- EETT treatment reduced brain inflammation, preserved myelination, upregulated BDNF signaling, and modulated synaptic protein expression.
Conclusions:
- Intensive sensorimotor rehabilitation, combining environmental enrichment and treadmill training, offers a promising therapeutic strategy for cerebral palsy.
- EETT engages specific neurobiological pathways crucial for early developmental processes and neurological recovery in CP.
- This translational approach highlights key mechanisms involved in improving functional outcomes in CP.
Background:
Cerebral Palsy (CP) is a major cause of motor and cognitive disability in children due to injury to the developing brain. Early intensive sensorimotor rehabilitation has been shown to change brain structure and reduce CP symptoms severity. We combined environmental enrichment (EE) and treadmill training (TT) to observe the effects of a one-week program of sensorimotor stimulation (EETT) in animals exposed to a CP model and explored possible mechanisms involved in the functional recovery.
Methods:
Pregnant Wistar rats were injected with Lipopolysaccharide (LPS - 200 µg/kg) intraperitoneally at embryonic days 18 and 19. At P0, pups of both sexes were exposed to 20' anoxia at 37 °C. From P2 to P21, hindlimbs were restricted for 16 h/day during the dark cycle. EETT lasted from P21 to P27. TT - 15 min/day at 7 cm/s. EE - 7 days in enriched cages with sensorimotor stimulus. Functional 3D kinematic gait analysis and locomotion were analyzed. At P28, brains were collected for ex-vivo MRI and histological assessment. Neurotrophins and key proteins involved in CNS function were assessed by western blotting.
Results:
CP model caused gross and skilled locomotor disruption and altered CNS neurochemistry. EETT reversed locomotor dysfunction with minor effects over gait kinematics. EETT also decreased brain inflammation and glial activation, preserved myelination, upregulated BDNF signaling and modulated the expression of proteins involved in excitatory synaptic function in the brain and spinal cord.
Conclusions:
Using this translational approach based on intensive sensorimotor rehabilitation, we highlight pathways engaged in the early developmental processes improving neurological recovery observed in CP.
