Motor and sensitive recovery after injection of a physically cross-linked PNIPAAm-g-PEG hydrogel in rat hemisectioned spinal cord

Publication date: Available online 23 October 2019Source: Materials Science and Engineering: CAuthor(s): Maxime Bonnet, Thomas Trimaille, Brezun Jean-Michel, François Feron, Didier Gigmes, Tanguy Marqueste, Patrick DecherchiAbstractIn line with experiments showing that implanted hydrogels are promising tools, we designed and injected, after a C2 spinal cord hemisection, a thermoresponsive and thermoreversible physically cross-linked poly(N-isopropylacrylamide)-poly(ethylene glycol) copolymer in order to reduce functional deficits and provide a favorable environment to axotomized axons.Nasal olfactory ecto-mesenchymal stem cells were cultured on the hydrogel in order to verify its biocompatibility. Then, inflammatory reaction (Interleukin-1β and 6, Tumor Necrosis Factor-α) was examined 15 days post-hydrogel injection. Functional recovery (postural and locomotor activities, muscle strength and tactile sensitivity) was assessed once a week, during 12 weeks. Finally, at 12 weeks post-injection, spinal reflexivity and ventilatory adjustments were measured, and the presence of glial cells and regenerated axons were determined in the injured area.Our results indicate that cells survived and proliferated on the hydrogel which, itself, did not induce an enhanced inflammation. Furthermore, we observed significant motor and sensitive improvements in hydrogel-injected animals. Hydrogel also induced H-reflex recovery close to control animals but no improved ventilatory a...
Source: Materials Science and Engineering: C - Category: Materials Science Source Type: research

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We cover a lot of news and announcements about digital health technologies to provide context for you. Even within The Medical Futurist team, there are favorite technologies and trends. And we thought it would be time to share the technologies we’re excited about! With advancements in exoskeleton technology, A.I.’s ever-increasing importance in healthcare and technologies like 5G and quantum computing soon going mainstream, there’s much to be excited about! Without further ado, let’s jump in! 1. Quantum Computing: faster, cheaper and safer Late last month, Google claimed “quantum suprema...
Source: The Medical Futurist - Category: Information Technology Authors: Tags: Future of Medicine digital health Healthcare technology digital technology Source Type: blogs
Abstract Complications associated with spinal cord injury (SCI) result from unregulated reflexes below the lesion level. Understanding neurotransmission distal to the SCI could improve quality of life by mitigating complications. The long-term impact of SCI on neurovascular transmission is poorly understood but reduced sympathetic activity below the site of SCI enhances arterial neurotransmission (1). We studied sympathetic neurovascular transmission using a rat model of long-term paraplegia (T2-3) and tetraplegia (C6-7). Sixteen weeks after SCI, T2-3 and C6-7 rats had lower blood pressure (BP) than sham rats (103...
Source: American Journal of Physiology. Heart and Circulatory Physiology - Category: Physiology Authors: Tags: Am J Physiol Heart Circ Physiol Source Type: research
CONCLUSIONS: The study findings suggest that resilience is a significant prospective predictor of psychological and social function over time in individuals with chronic physical disabilities. PMID: 31674642 [PubMed - as supplied by publisher]
Source: Annals of Behavioral Medicine - Category: Psychiatry & Psychology Authors: Tags: Ann Behav Med Source Type: research
Abstract Spinal cord injury (SCI) can have profound effects on the autonomic and cardiovascular systems, notably with injuries above high-thoracic levels that result in the development of autonomic dysreflexia (AD) characterized by volatile hypertension in response to exaggerated sympathetic reflexes triggered by afferent stimulation below the injury level. Pathophysiological changes associated with the development of AD include sprouting of both nociceptive afferents and ascending propriospinal 'relay' neurons below the injury, as well as dynamic changes in synaptic inputs onto sympathetic preganglionic neurons. ...
Source: Experimental Neurology - Category: Neurology Authors: Tags: Exp Neurol Source Type: research
All sorts of conditions, including muscular dystrophy, ALS, and partial spinal cord injury, result in patients losing their ability to confidently grasp objects with their hands. Regaining this important capability is usually a priority, as it is one...
Source: Medgadget - Category: Medical Devices Authors: Tags: Neurology Rehab Source Type: blogs
Abstract The output from a motor nucleus is determined by the synaptic input to the motor neurons and their intrinsic properties. Here, we explore whether the source of synaptic inputs to the motor neurons (cats) and the age or post-stroke conditions (humans) may change the recruitment gain of the motor neuron pool. In cats, the size of Ia EPSPs in triceps surae motor neurons (input) and monosynaptic reflexes (MSRs; output) was recorded in the soleus and medial gastrocnemius motor nerves following graded stimulation of dorsal roots. The MSR was plotted against the EPSP thereby obtaining a measure of the recruitmen...
Source: Experimental Brain Research - Category: Neuroscience Authors: Tags: Exp Brain Res Source Type: research
Abstract In SCI males, erectile function, ejaculation, and fertility are severely impaired. The present study utilized a telemetric pressure transducer implanted into the corpus cavernosum of the penis to examine sexual function during awake mating behavior in a rat contusion model with a range of Infinite Horizon Impactor forces distributed between 150-215 kilodynes. The mating behavior paradigm included examination of the counts, average pressure, and average duration for mounts, intromissions, and ejaculations. Male Wistar rats were mated with receptive females in 30-minute sessions pre-injury (sexual acclimati...
Source: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology - Category: Physiology Authors: Tags: Am J Physiol Regul Integr Comp Physiol Source Type: research
This report presents a novel technique termed the pharyngeal clearance maneuver, which uses a modified application of the mechanical insufflation-exsufflation device to mobilize “secretion burden” at the portion of the trachea above the tracheostomy cuff during cuff deflation. Utilization of this strategy may reduce the risk of aspiration, infection, and respiratory compromise for patients with high cervical spinal cord injury in the acute rehabilitation setting. It is of particular benefit for those whose cuffs are being deflated for the first time and who may have large secretion volumes above the cuff. It ca...
Source: American Journal of Physical Medicine and Rehabilitation - Category: Rehabilitation Tags: Brief Reports Source Type: research
ConclusionsDistal colon stimulation evoked colonic activity. The dependence of this response on stimulation location and anesthesia suggests that responses were reflex mediated. Colonic stimulation may have the potential to improve colonic motility for individuals with neurogenic bowel dysfunction.
Source: Neuromodulation: Technology at the Neural Interface - Category: Biotechnology Authors: Tags: Basic Research Source Type: research
Conclusion: This study demonstrates a linear correlation between the stimulation amplitude ranging from 1 to 4T and bladder capacity gain in individuals with SCI in acute GNS experiments. However, GNS amplitude out of the range of 1-4T might not be exactly a linear relationship due to subthreshold or saturation factors. Thus, further research is needed to examine this issue. Nevertheless, these results may be critical in laying the groundwork for understanding the effectiveness of acute GNS in the treatment of neurogenic detrusor overactivity. PMID: 31341487 [PubMed]
Source: Evidence-based Complementary and Alternative Medicine - Category: Complementary Medicine Tags: Evid Based Complement Alternat Med Source Type: research
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