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Serotonergic Facilitation of Forelimb Functional Recovery in Rats with Cervical Spinal Cord Injury
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Serotonergic Facilitation of Forelimb Functional Recovery in Rats with Cervical Spinal Cord Injury
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Journal Article
Serotonergic Facilitation of Forelimb Functional Recovery in Rats with Cervical Spinal Cord Injury
2021
Overview
Serotonergic agents can improve the recovery of motor ability after a spinal cord injury. Herein, we compare the effects of buspirone, a 5-HT1A receptor partial agonist, to fluoxetine, a selective serotonin reuptake inhibitor, on forelimb motor function recovery after a C4 bilateral dorsal funiculi crush in adult female rats. After injury, single pellet reaching performance and forelimb muscle activity decreased in all rats. From 1 to 6 weeks after injury, rats were tested on these tasks with and without buspirone (1–2 mg/kg) or fluoxetine (1–5 mg/kg). Reaching and grasping success rates of buspirone-treated rats improved rapidly within 2 weeks after injury and plateaued over the next 4 weeks of testing. Electromyography (EMG) from selected muscles in the dominant forelimb showed that buspirone-treated animals used new reaching strategies to achieve success after the injury. However, forelimb performance dramatically decreased within 2 weeks of buspirone withdrawal. In contrast, fluoxetine treatment resulted in a more progressive rate of improvement in forelimb performance over 8 weeks after injury. Neither buspirone nor fluoxetine significantly improved quadrupedal locomotion on the horizontal ladder test. The improved accuracy of reaching and grasping, patterns of muscle activity, and increased excitability of spinal motor–evoked potentials after buspirone administration reflect extensive reorganization of connectivity within and between supraspinal and spinal sensory-motor netxcopy works. Thus, both serotonergic drugs, buspirone and fluoxetine, neuromodulated these networks to physiological states that enabled markedly improved forelimb function after cervical spinal cord injury.
Publisher
Elsevier Inc,Springer International Publishing,Springer Nature B.V
Subject
/ Biomedical and Life Sciences
/ Electromyography - drug effects
/ Evoked Potentials, Motor - drug effects
/ Evoked Potentials, Motor - physiology
/ Female
/ Fluoxetine - therapeutic use
/ Forelimb
/ Grasping
/ Muscles
/ Original
/ Rats
/ Recovery of Function - drug effects
/ Recovery of Function - physiology
/ Selective Serotonin Reuptake Inhibitors - pharmacology
/ Selective Serotonin Reuptake Inhibitors - therapeutic use
/ Serotonin Receptor Agonists - pharmacology
/ Serotonin Receptor Agonists - therapeutic use
/ Spinal Cord Injuries - drug therapy
