scholarly journals Fluorescence Changes in Nerve Induced by Stimulation

1962 ◽  
Vol 46 (2) ◽  
pp. 267-275 ◽  
Author(s):  
Georges Ungar ◽  
Dominick V. Romano
Keyword(s):  
Absorption Spectrum ◽  
Electrical Stimulation ◽  
Peripheral Nerves ◽  
Control Level ◽  
Nerve Fibers ◽  
Ultraviolet Absorption Spectrum ◽  
Structural Rearrangements ◽  
Tissue Extracts ◽  
Fluorescent Method ◽  
Stimulation Of

It was previously assumed, on the basis of changes in the ultraviolet absorption spectrum and of increase in ionizable sulfhydryl groups, that during excitation the proteins of excitable structures undergo some structural rearrangements, and these rearrangements may be similar to those designated by the term transconformation. In the present experiments, it was observed that electrical stimulation of peripheral nerves from rat, guinea pig, frog, and crab causes a decrease in their fluorescence. The peaks of the emission and activation spectra correspond to those attributed to proteins. Denaturing agents, such as urea, were also found to decrease the fluorescence of nerve extracts. It is, therefore, probable that the decrease in fluorescence, associated with the excited state, is due to a change in the configuration of the nerve proteins. The fluorescent method is applicable not only to tissue extracts but allows the observation of surviving nerve fibers before, during, and after stimulation. It showed that fluorescence of the fibers decreases invariably during stimulation and tends to return to the control level during restoration. The reduction in fluorescence is quantitatively related to the number of stimuli received by the nerve.

scholarly journals ASCENT (Automated Simulations to Characterize Electrical Nerve Thresholds): A pipeline for sample-specific computational modeling of electrical stimulation of peripheral nerves

2021 ◽  
Vol 17 (9) ◽  
pp. e1009285
Author(s):  
Eric D. Musselman ◽  
Jake E. Cariello ◽  
Warren M. Grill ◽  
Nicole A. Pelot
Keyword(s):  
Electrical Stimulation ◽  
Computational Modeling ◽  
Peripheral Nerves ◽  
Nerve Fibers ◽  
Great Promise ◽  
Simulation Data ◽  
Stimulation Parameters ◽  
Neural Anatomy ◽  
Disease And Disorders ◽  
Stimulation Of

Electrical stimulation and block of peripheral nerves hold great promise for treatment of a range of disease and disorders, but promising results from preclinical studies often fail to translate to successful clinical therapies. Differences in neural anatomy across species require different electrodes and stimulation parameters to achieve equivalent nerve responses, and accounting for the consequences of these factors is difficult. We describe the implementation, validation, and application of a standardized, modular, and scalable computational modeling pipeline for biophysical simulations of electrical activation and block of nerve fibers within peripheral nerves. The ASCENT (Automated Simulations to Characterize Electrical Nerve Thresholds) pipeline provides a suite of built-in capabilities for user control over the entire workflow, including libraries for parts to assemble electrodes, electrical properties of biological materials, previously published fiber models, and common stimulation waveforms. We validated the accuracy of ASCENT calculations, verified usability in beta release, and provide several compelling examples of ASCENT-implemented models. ASCENT will enable the reproducibility of simulation data, and it will be used as a component of integrated simulations with other models (e.g., organ system models), to interpret experimental results, and to design experimental and clinical interventions for the advancement of peripheral nerve stimulation therapies.

Electrical Stimulation of the Spinal Cord and Peripheral Nerves for Pain Control

1981 ◽  
Vol 44 (4) ◽  
pp. 207-217 ◽  
Author(s):  
Don M. Long ◽  
Donald Erickson ◽  
James Campbell ◽  
Richard North
Keyword(s):  
Spinal Cord ◽  
Electrical Stimulation ◽  
Peripheral Nerves ◽  
Pain Control ◽  
Stimulation Of

ATP concentrations and muscle tension increase linearly with muscle contraction

2003 ◽  
Vol 95 (2) ◽  
pp. 577-583 ◽  
Author(s):  
Jianhua Li ◽  
Nicholas C. King ◽  
Lawrence I. Sinoway
Keyword(s):  
Skeletal Muscle ◽  
Electrical Stimulation ◽  
Muscle Contraction ◽  
Motor Nerve ◽  
Muscle Tension ◽  
Nerve Fibers ◽  
Ventral Root ◽  
Ventral Roots ◽  
Root Stimulation ◽  
Stimulation Of

Previous studies have suggested that activation of ATP-sensitive P2X receptors in skeletal muscle play a role in mediating the exercise pressor reflex (Li J and Sinoway LI. Am J Physiol Heart Circ Physiol 283: H2636–H2643, 2002). To determine the role ATP plays in this reflex, it is necessary to examine whether muscle interstitial ATP (ATPi) concentrations rise with muscle contraction. Accordingly, in this study, muscle contraction was evoked by electrical stimulation of the L7 and S1 ventral roots of the spinal cord in 12 decerebrate cats. Muscle ATPi was collected from microdialysis probes inserted in the muscle. ATP concentrations were determined by the HPLC method. Electrical stimulation of the ventral roots at 3 and 5 Hz increased mean arterial pressure by 13 ± 2 and 16 ± 3 mmHg ( P < 0.05), respectively, and it increased ATP concentration in contracting muscle by 150% ( P < 0.05) and 200% ( P < 0.05), respectively. ATP measured in the opposite control limb did not rise with ventral root stimulation. Section of the L7 and S1 dorsal roots did not affect the ATPi seen with 5-Hz ventral root stimulation. Finally, ventral roots stimulation sufficient to drive motor nerve fibers did not increase ATP in previously paralyzed cats. Thus ATPi is not largely released from sympathetic or motor nerves and does not require an intact afferent reflex pathway. We conclude that ATPi is due to the release of ATP from contracting skeletal muscle cells.

Relationships between permeable vessels, nerves, and mast cells in rat cutaneous neurogenic inflammation

1990 ◽  
Vol 68 (6) ◽  
pp. 2305-2311 ◽  
Author(s):  
J. N. Baraniuk ◽  
M. L. Kowalski ◽  
M. A. Kaliner
Keyword(s):  
Electrical Stimulation ◽  
Mast Cells ◽  
Neurogenic Inflammation ◽  
Sensory Nerve ◽  
Nerve Fibers ◽  
Sensory Nerves ◽  
Neurokinin A ◽  
Rat Skin ◽  
Protein Extravasation ◽  
Stimulation Of

Electrical stimulation of rat sensory nerves produces cutaneous vasodilation and plasma protein extravasation, a phenomenon termed “neurogenic inflammation”. Rat skin on the dorsum of the paw developed neurogenic inflammation after electrical stimulation of the saphenous nerve. In tissue sections, the extravasation of the supravital dye monastral blue B identified permeable vessels. Mast cells were identified by toluidine blue stain. Permeable vessels were significantly more dense in the superficial 120 microns of the dermis than in the deeper dermis, whereas mast cells were significantly more frequent in the deeper dermis. The relationships between nociceptive sensory nerve fibers, permeable vessels, and mast cells were examined by indirect immunohistochemistry for calcitonin gene-related peptide (CGRP), neurokinin A (NKA), and substance P (SP). CGRP-, NKA-, and SP-containing nerves densely innervated the superficial dermis and appeared to innervate the vessels that became permeable during neurogenic inflammation. In contrast, mast cells were not associated with either permeable vessels or nerve fibers. These data suggest that electrical stimulation of rat sensory nerves produces vascular permeability by inducing the release of neuropeptides that may directly stimulate the superficial vascular bed. Mast cells may not be involved in this stage of cutaneous neurogenic inflammation in rat skin.

scholarly journals Perspective Nerve Conduits for Stimulation of Regeneration of Damaged Peripheral Nerves

2018 ◽  
Vol 73 (6) ◽  
pp. 388-400
Author(s):  
Polina K. Miroshnikova ◽  
Alexey V. Lyundup ◽  
Nikolay P. Batsalenko ◽  
Mikhail E. Krasheninnikov ◽  
Yuanyuan Zhang ◽  
...  
Keyword(s):  
Peripheral Nerves ◽  
Severe Trauma ◽  
Nerve Fibers ◽  
Biologically Active ◽  
Active Components ◽  
Advantages And Disadvantages ◽  
Nerve Conduits ◽  
Golden Standard ◽  
Preclinical And Clinical Studies ◽  
Stimulation Of

Nerve damage is a common severe trauma caused by a complete or partial disruption of the integrity of the nerve trunk and appropriate dissociation of the CNS and denervated tissue. «Golden standard» in the treatment of extensive injuries of peripheral nerves is the use of autografts of nerve fibers, but when they are used, pathological disturbances appear in the donor zone and the results of surgical treatment are not always satisfactory. Currently, an alternative to the traditional method is the use of nerve conduits (conductors) for directed regeneration of axons. In this work, the results of the application of nerve conductors from various materials and with various biologically active components in preclinical and clinical studies, as well as conduits used in clinical practice, were analyzed. The efficiency of regeneration was compared, on the basis of the analysis the conductor most suitable for successful nerve regeneration was selected, including approaches for creating innervated tissue engineered constructs. In this work, we have collected research on nerve conductors from various materials with various prescribed properties using certain factors used to treat damage to the peripheral nervous system, showing all the advantages and disadvantages of their use, which makes it possible to develop and create a conduit that meets all the requirements of modern regenerative medicine.

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