From cerebral palsy to developmental coordination disorder : Development of preclinical rat models corresponding to recent epidemiological changes / Jacques-Olivier Coq in Annals of physical and rehabilitation medicine, Vol. 63, n°5 (Octobre 2020)

Public ISBD [article]  inAnnals of physical and rehabilitation medicine > Vol. 63, n°5 (Octobre 2020) . - p. 422-430 Titre : From cerebral palsy to developmental coordination disorder : Development of preclinical rat models corresponding to recent epidemiological changes Type de document : texte imprimé Auteurs : Jacques-Olivier Coq ; Marine Kochmann ; Diego C. Lacerda ; Hanane Khalki ; Maxime Delcour ; Ana E. Toscano ; Florence Cayetanot ; Marie-Hélène Canu ; Mary F. Barbe ; Masahiro Tsuji Année de publication : 2020 Article en page(s) : p. 422-430 Note générale : doi.org/10.1016/j.rehab.2019.10.002 Langues : Anglais (eng) Mots-clés : Cerebral palsy  Prematurity  Developmental Coordination Disorder  Intrauterine growth retardation  Hypoperfusion  Sensorimotor restriction  White matter injury Résumé : Cerebral palsy (CP) is a complex syndrome of various sensory, motor and cognitive deficits. Its prevalence has recently decreased in some developed countries and its symptoms have also shifted since the 1960s. From the 1990s, CP has been associated with prematurity, but recent epidemiologic studies show reduced or absent brain damage, which recapitulates developmental coordination disorder (DCD). In previous studies, we developed a rat model based on mild intrauterine hypoperfusion (MIUH) that recapitulated the diversity of symptoms observed in preterm survivors. Briefly, MIUH led to early inflammatory processes, diffuse brain damage, minor locomotor deficits, musculoskeletal pathologies, neuroanatomical and functional disorganization of the primary somatosensory (S1) cortex but not in the motor cortex (M1), delayed sensorimotor reflexes, spontaneous hyperactivity, deficits in sensory information processing, and memory and learning impairments in adult rats. Adult MIUH rats also exhibited changes in muscle contractile properties and phenotype, enduring hyperreflexia and spasticity, as well as hyperexcitability in the sensorimotor cortex. We recently developed a rat model of DCD based on postnatal sensorimotor restriction (SMR) without brain damage. Briefly, SMR led to digitigrade locomotion (i.e., “toe walking”) related to ankle-knee overextension, degraded musculoskeletal tissues (e.g., gastrocnemius atrophy), and lumbar hyperreflexia. The postnatal SMR then led to secondary degradation of the hind-limb maps in S1 and M1 cortices, altered cortical response properties and cortical hyperexcitability, but no brain damage. Thus, our 2 rat models appear to recapitulate the diversity of symptoms ranging from CP to DCD and contribute to understanding the emergence and mechanisms underlying the corresponding neurodevelopmental disorders. These preclinical models seem promising for testing strategies of rehabilitation based on both physical and cognitive training to promote adaptive brain plasticity and to improve physical body conditions. Permalink : ./index.php?lvl=notice_display&id=91316 [article] From cerebral palsy to developmental coordination disorder : Development of preclinical rat models corresponding to recent epidemiological changes [texte imprimé] / Jacques-Olivier Coq ; Marine Kochmann ; Diego C. Lacerda ; Hanane Khalki ; Maxime Delcour ; Ana E. Toscano ; Florence Cayetanot ; Marie-Hélène Canu ; Mary F. Barbe ; Masahiro Tsuji . - 2020 . - p. 422-430. doi.org/10.1016/j.rehab.2019.10.002 Langues : Anglais (eng) in Annals of physical and rehabilitation medicine > Vol. 63, n°5 (Octobre 2020) . - p. 422-430 Mots-clés : Cerebral palsy  Prematurity  Developmental Coordination Disorder  Intrauterine growth retardation  Hypoperfusion  Sensorimotor restriction  White matter injury Résumé : Cerebral palsy (CP) is a complex syndrome of various sensory, motor and cognitive deficits. Its prevalence has recently decreased in some developed countries and its symptoms have also shifted since the 1960s. From the 1990s, CP has been associated with prematurity, but recent epidemiologic studies show reduced or absent brain damage, which recapitulates developmental coordination disorder (DCD). In previous studies, we developed a rat model based on mild intrauterine hypoperfusion (MIUH) that recapitulated the diversity of symptoms observed in preterm survivors. Briefly, MIUH led to early inflammatory processes, diffuse brain damage, minor locomotor deficits, musculoskeletal pathologies, neuroanatomical and functional disorganization of the primary somatosensory (S1) cortex but not in the motor cortex (M1), delayed sensorimotor reflexes, spontaneous hyperactivity, deficits in sensory information processing, and memory and learning impairments in adult rats. Adult MIUH rats also exhibited changes in muscle contractile properties and phenotype, enduring hyperreflexia and spasticity, as well as hyperexcitability in the sensorimotor cortex. We recently developed a rat model of DCD based on postnatal sensorimotor restriction (SMR) without brain damage. Briefly, SMR led to digitigrade locomotion (i.e., “toe walking”) related to ankle-knee overextension, degraded musculoskeletal tissues (e.g., gastrocnemius atrophy), and lumbar hyperreflexia. The postnatal SMR then led to secondary degradation of the hind-limb maps in S1 and M1 cortices, altered cortical response properties and cortical hyperexcitability, but no brain damage. Thus, our 2 rat models appear to recapitulate the diversity of symptoms ranging from CP to DCD and contribute to understanding the emergence and mechanisms underlying the corresponding neurodevelopmental disorders. These preclinical models seem promising for testing strategies of rehabilitation based on both physical and cognitive training to promote adaptive brain plasticity and to improve physical body conditions. Permalink : ./index.php?lvl=notice_display&id=91316

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Interplay between hypoactivity, muscle properties and motor command: How to escape the vicious deconditioning circle? / Marie-Hélène Canu in Annals of physical and rehabilitation medicine, Vol. 62, n°2 (Mars 2019)  

Public ISBD [article]  inAnnals of physical and rehabilitation medicine > Vol. 62, n°2 (Mars 2019) . - p. 122-127 Titre : Interplay between hypoactivity, muscle properties and motor command: How to escape the vicious deconditioning circle? Type de document : texte imprimé Auteurs : Marie-Hélène Canu ; Julie Fourneau ; Jacques-Olivier Coq ; Luc Dannhoffer ; Caroline Cieniewski ; Laurence Stevens ; Bruno Bastide ; Erwan Dupont Année de publication : 2019 Article en page(s) : p. 122-127 Note générale : https://doi.org/10.1016/j.rehab.2018.09.009 Langues : Anglais (eng) Mots-clés : Neuromuscular plasticity  Immobilization  Motor behavior  Bed rest  Sensorimotor cortex  Disuse atrophy Résumé : Activity-dependent processes addressing the central nervous system (CNS) and musculoskeletal structures are critical for maintaining motor performance. Chronic reduction in activity, whether due to a sedentary lifestyle or extended bed rest, results in impaired performance in motor tasks and thus decreased quality of life. In the first part of this paper, we give a narrative review of the effects of hypoactivity on the neuromuscular system and behavioral outcomes. Motor impairments arise from a combination of factors including altered muscle properties, impaired afferent input, and plastic changes in neural structure and function throughout the nervous system. There is a reciprocal interplay between the CNS and muscle properties, and these sensorimotor loops are essential for controlling posture and movement. As a result, patients under hypoactivity experience a self-perpetuating cycle, in with sedentarity leading to decreased motor activity and thus a progressive worsening of a situation, and finally deconditioning. Various rehabilitation strategies have been studied to slow down or reverse muscle alteration and altered motor performance. In the second part of the paper, we review representative protocols directed toward the muscle, the sensory input and/or the cerebral cortex. Improving an understanding of the loss of motor function under conditions of disuse (such as extended bed rest) as well as identifying means to slow this decline may lead to therapeutic strategies to preserve quality of life for a range of individuals. The most efficient strategies seem multifactorial, using a combination of approaches targeting different levels of the neuromuscular system. En ligne : https://www.sciencedirect.com/science/article/pii/S1877065718314738 Permalink : ./index.php?lvl=notice_display&id=84106 [article] Interplay between hypoactivity, muscle properties and motor command: How to escape the vicious deconditioning circle? [texte imprimé] / Marie-Hélène Canu ; Julie Fourneau ; Jacques-Olivier Coq ; Luc Dannhoffer ; Caroline Cieniewski ; Laurence Stevens ; Bruno Bastide ; Erwan Dupont . - 2019 . - p. 122-127. https://doi.org/10.1016/j.rehab.2018.09.009 Langues : Anglais (eng) in Annals of physical and rehabilitation medicine > Vol. 62, n°2 (Mars 2019) . - p. 122-127 Mots-clés : Neuromuscular plasticity  Immobilization  Motor behavior  Bed rest  Sensorimotor cortex  Disuse atrophy Résumé : Activity-dependent processes addressing the central nervous system (CNS) and musculoskeletal structures are critical for maintaining motor performance. Chronic reduction in activity, whether due to a sedentary lifestyle or extended bed rest, results in impaired performance in motor tasks and thus decreased quality of life. In the first part of this paper, we give a narrative review of the effects of hypoactivity on the neuromuscular system and behavioral outcomes. Motor impairments arise from a combination of factors including altered muscle properties, impaired afferent input, and plastic changes in neural structure and function throughout the nervous system. There is a reciprocal interplay between the CNS and muscle properties, and these sensorimotor loops are essential for controlling posture and movement. As a result, patients under hypoactivity experience a self-perpetuating cycle, in with sedentarity leading to decreased motor activity and thus a progressive worsening of a situation, and finally deconditioning. Various rehabilitation strategies have been studied to slow down or reverse muscle alteration and altered motor performance. In the second part of the paper, we review representative protocols directed toward the muscle, the sensory input and/or the cerebral cortex. Improving an understanding of the loss of motor function under conditions of disuse (such as extended bed rest) as well as identifying means to slow this decline may lead to therapeutic strategies to preserve quality of life for a range of individuals. The most efficient strategies seem multifactorial, using a combination of approaches targeting different levels of the neuromuscular system. En ligne : https://www.sciencedirect.com/science/article/pii/S1877065718314738 Permalink : ./index.php?lvl=notice_display&id=84106

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