Download or read book Effects of Spinal Cord Contusion Injury on Rat Propriospinal Neurons written by Amanda C. Conta and published by . This book was released on 2006 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Propriospinal Neurons Essential Elements in Locomotion Autonomic Function and Plasticity after Spinal Cord Injury and Disease written by Katinka Stecina and published by Frontiers Media SA. This book was released on 2021-06-28 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasticity of primary afferent neurons and sensory processing after spinal cord injury written by Alexander Rabchevsky and published by Frontiers Media SA. This book was released on 2015-01-05 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traumatic injury of the spinal cord affects the entire organism directly and indirectly. Primary injury destroys neurons and severs axons which participate in neural circuits. Secondary injuries and pathologies arise from numerous sources including systemic inflammation, consequential damage of cutaneous, muscular, and visceral tissues, and dysregulation of autonomic, endocrine and sensory- motor functions. Evidence is mounting that spinal cord injury (SCI) affects regions of the nervous system spatially remote from the injury site, as well as peripheral tissues, and alters some basic characteristics of primary afferent cell biology and physiology (cell number, size/frequency, electrophysiology, other). The degree of afferent input and processing above the lesion is generally intact, while that in the peri-lesion area is highly variable, though pathologies emerge in both regions, including a variety of pain syndromes. Primary afferent input to spinal regions below the injury and the processing of this information becomes even more important in the face of complete or partial loss of descending input because such spared sensory processing can lead to both adaptive and pathological outcomes. This issue hosts review and research articles considering mechanisms of plasticity of primary afferent neurons and sensory processing after SCI, and how such plasticity contributes to sparing and/or recovery of functions, as well as exacerbation of existing and/or emergent pathologies. A critical issue for the majority of the SCI community is chronic above-, peri-, and below-level neuropathic pain, much of which may arise, at least in part, from plasticity of afferent fibers and nociceptive circuitry. For example, autonomic dysreflexia is common hypertensive syndrome that often develops after SCI that is highly reliant on maladaptive nociceptive sensory input and processing below the lesion. Moreover, the loss of descending input leaves the reflexive components of bladder/bowel/sexual function uncoordinated and susceptible to a variety of effects through afferent fiber plasticity. Finally, proper afferent feedback is vital for the effectiveness of activity-dependent rehabilitative therapies, but aberrant nociceptive input may interfere with these approaches since they are often unchecked due to loss of descending modulation.
Download or read book Modelling of Spinal Cord Injury in the Rat written by Donald Lee Behrmann and published by . This book was released on 1992 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Red Light Treatment on Spinal Cord Injury in Rats written by Di Hu and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spinal cord injury can cause detrimental damage or complete loss in sensory and motor function. Current treatments, such as pharmaceutical interventions and physical therapy, provide limited improvements to restoring sensorimotor function following spinal cord injury. A non-conventional treatment using light irradiation in the red to near infrared range has been shown to promote recovery in a variety of injuries and conditions including spinal cord injury. This thesis examines the effects of red (670 nm) light irradiation on sensorimotor recovery following a mild T10 hemicontusion spinal cord injury in rats. To demonstrate that this treatment could potentially access the human cord, the penetration of 670 nm irradiation in different human tissues in both human participants and cadavers were examined. 670 nm irradiation with a light emitting diode (LED) at an intensity of 100 mW/cm2 was shown to penetrate 50 mm of human tissue, independent of skin tone, indicating that red light treatment could reach the spinal cord of humans with intensities ≥ 100 mW/cm2. Following spinal cord injury in rats, the development of mechanical hypersensitivity, the functional integrity of dorsal column pathways (measured from surface field potential electrophysiology recording) and locomotor function (evaluated from the Basso, Beattie and Bresnahan locomotor test), together with cellular changes in the spinal cord (evaluated from immunohistochemistry) were investigated. Animals with spinal cord injury were separated into hypersensitive and normosensitive subpopulations based on their mechanical sensitivity. Daily 30 min 670 nm irradiation (35 mW/cm2) is effective at reducing the chance of developing mechanical hypersensitivity following spinal cord injury, as well as reducing the mechanical sensitivity in the normosensitive subpopulation from 1-day, and the hypersensitive subpopulation from 7-days post-injury. The treatment also improves sensory conduction along the dorsal column pathway and accelerates locomotor recovery. These functional improvements are accompanied with: an overall reduction of microglial/macrophage activation, but a specific increase in the proportion of the anti-inflammatory subtype; reduced astrocyte reactivity; reduced iNOS expressing microglia/macrophages; and reduced density of cells undergoing apoptosis/necrosis. Together, the findings in this thesis highlight the potential for the use of red light as a non-invasive and inexpensive treatment/adjunct therapy for spinal cord injured patients.
Download or read book Modeling and Treatment of Rat Cervical Spinal Cord Injury written by John Carib Gensel and published by . This book was released on 2007 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Spinal cord injury (SCI) is a long lasting, debilitating condition with no cure. Cervical SCI is the most common form of human SCI, often leaving patients paralyzed with a 15-20 year decrease in life expectancy. The majority of animal SCI contusion models are focused on thoracic injury. SCI at this level results in deficits almost entirely due to white matter damage that disconnects the rostral nervous system from the caudal spinal cord. Damage at the cervical level is different; in addition to the disconnection, gray matter damage affects the neurons controlling the upper extremities and diaphragm. To investigate injury at the cervical level, we characterized a unilateral C5 cervical contusion model in rats. By examining six-week behavioral recovery after SCI, we demonstrated that functional deficits are dependent upon the severity of injury. Analysis of the histopathology revealed that behavioral consequences are a result of damage to both the gray and white matter. Unilateral injury provides within-subject controls and preserves bladder and respiratory function. Many treatments for experimental rat SCI improve behavioral and histological outcomes but have yet to be implemented after human SCI. Treatments must be safe and tested in clinically relevant models to move from animals to humans. We examined the effects of three different clinically acceptable drugs. Methlyprednisolone and minocycline have anti-inflammatory effects if given after injury. Topiramate blocks glutamate receptors and hence excitotoxicity, an important component of secondary injury. Minocycline and methylprednisolone treatment yielded no significant behavioral or histological improvements when tested after moderate-severe unilateral cervical contusion injury. Topiramate was first tested in a model of excitotoxicity and then after cervical SCI and was compared to NBQX, a standard AMPA-receptor antagonists used in animal models of disease. Both drugs preserved neurons after excitotoxic injury, but only topiramate was found to protect neurons after SCI. More small and medium sized neurons were spared in the topiramate treated group compared to control 48 hours after SCI. NBQX treatment increased white matter sparing compared to control, but resulted in worse motor function compared to topiramate. Both treatments were only effective when applied after moderate-severe injury and not after mild injury.
Download or read book The Spinal Cord written by Charles Watson and published by Academic Press. This book was released on 2009-11-27 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many hundreds of thousands suffer spinal cord injuries leading to loss of sensation and motor function in the body below the point of injury. Spinal cord research has made some significant strides towards new treatment methods, and is a focus of many laboratories worldwide. In addition, research on the involvement of the spinal cord in pain and the abilities of nervous tissue in the spine to regenerate has increasingly been on the forefront of biomedical research in the past years. The Spinal Cord, a collaboration with the Christopher and Dana Reeve Foundation, is the first comprehensive book on the anatomy of the mammalian spinal cord. Tens of thousands of articles and dozens of books are published on this subject each year, and a great deal of experimental work has been carried out on the rat spinal cord. Despite this, there is no comprehensive and authoritative atlas of the mammalian spinal cord. Almost all of the fine details of spinal cord anatomy must be searched for in journal articles on particular subjects. This book addresses this need by providing both a comprehensive reference on the mammalian spinal cord and a comparative atlas of both rat and mouse spinal cords in one convenient source. The book provides a descriptive survey of the details of mammalian spinal cord anatomy, focusing on the rat with many illustrations from the leading experts in the field and atlases of the rat and the mouse spinal cord. The rat and mouse spinal cord atlas chapters include photographs of Nissl stained transverse sections from each of the spinal cord segments (obtained from a single unfixed spinal cord), detailed diagrams of each of the spinal cord segments pictured, delineating the laminae of Rexed and all other significant neuronal groupings at each level and photographs of additional sections displaying markers such as acetylcholinesterase (AChE), calbindin, calretinin, choline acetlytransferase, neurofilament protein (SMI 32), enkephalin, calcitonin gene-related peptide (CGRP), and neuronal nuclear protein (NeuN). - The text provides a detailed account of the anatomy of the mammalian spinal cord and surrounding musculoskeletal elements - The major topics addressed are: development of the spinal cord; the gross anatomy of the spinal cord and its meninges; spinal nerves, nerve roots, and dorsal root ganglia; the vertebral column, vertebral joints, and vertebral muscles; blood supply of the spinal cord; cytoarchitecture and chemoarchitecture of the spinal gray matter; musculotopic anatomy of motoneuron groups; tracts connecting the brain and spinal cord; spinospinal pathways; sympathetic and parasympathetic elements in the spinal cord; neuronal groups and pathways that control micturition; the anatomy of spinal cord injury in experimental animals - The atlas of the rat and mouse spinal cord has the following features: Photographs of Nissl stained transverse sections from each of 34 spinal segments for the rat and mouse; Detailed diagrams of each of the 34 spinal segments for rat and mouse, delineating the laminae of Rexed and all other significant neuronal groupings at each level. ; Alongside each of the 34 Nissl stained segments, there are additional sections displaying markers such as acetylcholinesterase, calbindin, calretinin, choline acetlytransferase, neurofilament protein (SMI 32), and neuronal nuclear protein (NeuN) - All the major motoneuron clusters are identified in relation to the individual muscles or muscle groups they supply
Download or read book The Recovery of Function After Spinal Cord Contusion Injury in Rats written by Karen J. Hutchinson and published by . This book was released on 2000 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Role of C3 C4 Propriospinal Interneurons on Reaching and Grasping Behaviors Pre and Post Cervical Spinal Cord Injury written by Imran Sana Sheikh and published by . This book was released on 2018 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Greater than 50% of all spinal cord injuries (SCIs) in humans occur at the cervical level and the biggest desire of quadriplegic patients is recovery of hand and digit function. Several weeks after spinal cord injury, re-organization and re-modeling of spared endogenous pathways occurs and plasticity of both supraspinal and interneuronal networks are believed to mediate functional recovery. Propriospinal interneurons (PNs) are neurons found entirely in the spinal cord with axons projecting to different spinal segments. PNs function by modulating locomotion, integrating supraspinal motor pathways and peripheral sensory afferents. Recent studies have postulated that if PNs are spared following SCI, these neurons can contribute to functional recovery by establishing synaptic connections onto motor neurons. However, to what extent cervical PNs are involved in recovery of reaching behavior is not known. In our first study, we generated a lentiviral vector that permits highly efficient retrograde transport (HiRet) upon uptake at synaptic terminals in order to map supraspinal and interneuronal populations terminating near forelimb motoneurons (MNs) innervating the limb. With this vector, we found neurons labeled within the C3-C4 spinal cord and in the red nucleus, two major populations which are known to modulate forelimb reaching behavior. We also proceeded to use a novel two-viral vector method to specifically label ipsilateral C3-C4 PNs with tetracycline-inducible GFP. Histological analysis showed detailed labeling of somas, dendrites along with axon terminals. Based on this data, we proceeded to determine the contribution of C3-C4 PNs and rubrospinal neurons on forelimb reaching and grasping before and after cervical SCI. In our second study, we have examined a double-infection technique for shutdown of PNs and rubrospinal neurons (RSNs) in adult rats. Adult rats were microinjected with a lentiviral vector expressing tetracycline-inducible inhibitory DREADDs into C6-T1 spinal levels. Adeno-associated viral vectors (AAV2) expressing TetON mixed with GIRK2 were injected into the red nucleus and C3-C4 spinal levels respectively. Rats were tested for deficits in reaching behaviors upon application of doxycycline and clozapine-n-oxide (CNO) administration. No behavioral deficits were observed pre-injury. Rats then received a C5 spinal cord lesion to sever cortical input to forelimb motoneurons and were allowed four weeks to spontaneously recover. Upon re-administration of CNO to activate inhibitory DREADDs, deficits were observed in forelimb reaching. Histological analysis of the C3-C4 spinal cord and red nucleus showed DREADD+ neurons co-expressing GIRK2 in somas and dendrites of PNs and RSNs. PN terminals expressing DREADD were observed near C6-T1 motoneurons and in the brainstem. Control animals did not show substantial deficits with CNO administration. These results indicate both rubro- and propriospinal pathways are necessary for recovery of forelimb reaching. In a separate study, we sought to determine if promoting severed CST sprouting rostral to a C5 lesion near C3-C4 PNs could improve behavioral recovery post SCI. Past studies have examined sprouting and regeneration of corticospinal tract (CST) fibers post-cervical SCI through viral upregulation of key components of the PI3K/Akt/mTOR cascade. We examined the regenerative growth potential of CST fibers that are transduced with AAV2 expressing constituively active Akt3 or STAT3 both separately and in combination (Akt3 + STAT3). We have observed significant increases in CST axonal sprouting and regeneration in Akt3 and Akt3 + STAT3 transduced samples. However, no recovery was observed as animals transduced with viral constitutively active Akt3 displayed an epileptic phenotype. Further, epileptic animals with constitutively active Akt3 were found to have significant cortical neuron cell hypertrophy, activatived astrogliosis, increased dendritic arbors and hemimegencephalitis (HME). These results indicate a new model for examining mechanisms of HME and mTOR hyperactivity-induced epilepsy in adult rodents.
Download or read book Neurotrauma written by Raj K. Narayan and published by McGraw-Hill. This book was released on 1996 with total page 1558 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reference is a comprehensive work in the field of neurotrauma and critical care. It incorporates the fields of head injury, spinal injury and basic neurotrauma research into one source. The major emphasis is on the treatment of patients with head and spinal cord injury, including the management of all other problems that bear upon the care of these patients.
Download or read book Spinal Cord Injury SCI Repair Strategies written by Giuseppe Perale and published by Woodhead Publishing. This book was released on 2019-10-30 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spinal Cord Injury (SCI) Repair Strategies provides researchers the latest information on potential regenerative approaches to spinal cord injury, specifically focusing on therapeutic approaches that target regeneration, including cell therapies, controlled drug delivery systems, and biomaterials. Dr. Giuseppe Perale and Dr. Filippo Rossi lead a team of authoritative authors in academia and industry in this innovative reference on the field of regenerative medicine and tissue engineering. This book presents all the information readers need to understand the current and potential array of techniques, materials, applications and their benefits for spinal cord repair. - Covers current and future repair strategies for spinal cord injury repair - Focuses on key research trends, clinics, biology and engineering - Provides fundamentals on regenerative engineering and tissue engineering
Download or read book The Fischer 344 Spinal Cord Contusion Model and Effects of Cyclosporin A on the Model written by Shao-Yun Hsu and published by . This book was released on 2016 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Multicenter Animal Spinal Cord Injury Study (MASCIS) standardized spinal cord injury (SCI) in Long-Evans hooded and Sprague-Dawley rats. In this thesis, we extended the MASCIS model to Fischer 344 (F344) rats for the following reasons. First, F344 rats are immune-compatible with each other. Cells can be transplanted from one F344 rat to another without immunosuppression. Second, our laboratory developed a strain of F344 rats that express green fluorescent protein (GFP). When transplanted into regular F344 rats, GFP F344 rat cells can be readily identified. Third, F344 rats are isogenic. They should have more uniform and replicable responses to injury and therapies. Finally, this F344 model allows us to assess effects of allogeneic cell transplants with and without immunosuppressive drugs, such as cyclosporin-A (CsA), as well as the effects of immunosuppressive drugs on transplanted cells. We chose to assess olfactory ensheathing glial (OEG) cell transplants because many investigators have reported that these cells improve motor recovery in rat SCI models. Our results show that F344 rats can be reproducibly injured with the MASCIS model and that OEG transplants significantly improve locomotor recovery when transplanted without CsA. However, we encountered several unexpected findings. Female rats recovered more than male rats even though the animals were age-matched, studies of the spinal cords revealed no difference in size and anatomy of age-matched male and female rats, and 24-hour lesion volumes in male and female spinal cords were the same. OEG transplants improved recovery of male rats, almost as well as untreated female rats. CsA therapy improved recovery in both male and female rats. We conclude that the MASCIS model causes reproducible injury to spinal cords of F344 rats, age-matched female rats recover better locomotor function than male rats, OEG cells can be transplanted from GFP F344 rats to wild-type F344 rats without immune rejection, OEG transplants improve functional recovery particularly in male rats, CsA improved locomotor recovery in both male and female F344 rats. The MASCIS impactor model should be very useful for assessing mechanisms underlying gender differences, OEG and CsA effects on transplanted cells and recovery mechanisms.
Download or read book Shock Induces a Deficit in the Recovery of Function After a Contusion Injury written by Anne Caroline Bopp and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Prior studies have shown that exposure to uncontrollable stimulation can have a variety of adverse consequences on plasticity. For example, as little as 30 min of uncontrollable shock to the tail disrupts both the capacity for instrumental learning and the recovery of locomotor function following spinal cord injury (SCI). Whereas evidence suggests that the disruption of instrumental learning depends on maladaptive plasticity within spinal cord neurons, it is still unknown whether the disruptive effects of shock on locomotor recovery following SCI reflects a brain or spinally-mediated effect. The present experiments address this research question by determining whether shock exposure induces an alteration within the spinal cord of contused rats and testing the effects of disrupting communication between the spinal cord and brain during shock exposure to see if this manipulation protects animals from the effects of shock on locomotor recovery. Experiment 1 found that contused rats transected prior to shock exposure failed to acquire the instrumental response when tested 24 hours later. In addition, contused animals transected after shock exposure also failed to learn when tested, though this effect was less robust. Given the results of Experiment 1, it is plausible that impaired spinal function is sufficient to explain the effects of shock on locomotor recovery. Experiments 2 and 3 addressed this possibility by manipulating communication between the brain and spinal cord prior to shock exposure. In Experiment 2 intrathecal lidocaine was applied rostral to the injury to temporarily disrupt transmission. In Experiment 3, normal brain function was inhibited with intraperitoneal injection of pentobarbital. Interestingly, both manipulations showed that disrupting normal communication between the spinal cord and brain during shock exposure protected animals from the adverse consequences of shock on locomotor recovery. The data suggest that, following SCI, blocking communication between the brain and spinal cord protects animals from the adverse consequences of uncontrollable stimulation.
Download or read book Immunological Consequences of Experimental Spinal Contusion Injury in the Rat written by Phillip G. Popovich and published by . This book was released on 1995 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neuroanatomical Tract Tracing written by Laszlo Zaborszky and published by Springer Science & Business Media. This book was released on 2006-11-22 with total page 703 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first two editions of this title had a tremendous impact in neuroscience. Between the Second edition in 1989 and today, there has been an explosion of information in the field, including advances in molecular techniques, such as genomics and proteomics, which have become increasing important in neuroscience. A renaissance in fluorescence has occurred, driven by the development of new probes, new microscopes, live imagers, and computer processing. The introduction of new markers has enormously stimulated the field, moving it from tissue culture to neurophysiology to functional MRI techniques.
Download or read book Recovery of Motor Function Following Spinal Cord Injury written by Heidi Fuller and published by BoD – Books on Demand. This book was released on 2016-08-17 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Restoration of motor function following spinal cord injury is a complex and challenging task. By reviewing emerging cellular, pharmacological, rehabilitative, as well as surgical approaches, this book seeks to highlight promising therapeutic strategies for the repair and regeneration of motor circuitry. The multidisciplinary nature of these approaches illustrates various routes to bridging the gap between the bench and the bedside and to identify the challenges that must be overcome in order to bring about a viable therapeutic strategy for spinal cord injury patients.
Download or read book Neurorestoratology written by Hongyun Huang and published by Nova Science Publishers. This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neurorestoratology is one of the most important disciplines in modern medicine and is also the most important discipline in neuroscience. Its core aim is to restore, promote and maintain the integrity of impaired or lost neuronal functions and/or structures by using novel cell-based comprehensive neurorestorative strategies. This book is the first and a unique one that systematically expounds the main aspects of neurorestoratology, which includes three sections with 22 chapters in two volumes. It systematically elaborates CNS neurorestorable theory and neurorestorative mechanisms. It firstly comprehends the Neurorestorative Process as a whole and Neurorestorative law. It fully describes all neurorestorative strategies and their continuing clinical progresses and achievements, especially the cell-based comprehensive neurorestorative strategies.
