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1.
Article in Chinese | WPRIM | ID: wpr-872753

ABSTRACT

Objective:To investigate the effects of Buyang Huanwu Tang (BHT) on axonal regeneration and neurological rehabilitation of the rats suffering ischemic stroke (IS). Method:A total of 180 SD rats were used to establish a middle cerebral artery infarction (MCAO) model. The animals that were successfully modeled were randomly divided into model group, BHT group (12 g·kg-1) and nimodipine group (20 mg·kg-1), and a sham group was established, with 28 rats in each group. After seven-days intragastric administration of BHT, the animals were sacrificed. TTC staining was used to test cerebral infarction. Brain water content was measured to observe cerebral edema. Bielschowsky's silver staining and immunofluorescence were performed to observe axonal degeneration and the protein expression of neurofilament protein-200(NF-200). Quantitative real-time polymerase chain reaction (PCR) was used to analyze the mRNA expression of repulsion oriented molecule a (RGMa), Ras homologous enzyme (Rho), Rho kinase (ROCK), and collapsion response regulatory protein 2 (CRMP2). Neurological function scores assay was used to examine neurological recovery. Result:Compared with sham group, the cerebral infarction volume and brain water content increased significantly(P<0.01), and motor function was markablely decreased in the model group. Axonal degeneration and nerve fiber damage were obviously observed. Also, gene expression of axon growth-related protein was deviation from normal (P<0.01). Compared with model group, the cerebral infarction rate (P<0.01), brain water content (P<0.01) and axonal degeneration of BHT group and nimodipine group were significantly reduced. The expression of NF-200 was increased. Also, the mRNA expression of RGMa, Rho and ROCK was lower (P<0.05) while the mRNA expression of CRMP2 was higher (P<0.01). And the neurological function was significantly improved (P<0.05). Conclusion:BHT can promote axon regeneration after ischemic stroke injury by regulating the mRNA expression of axon growth-related protein, thereby improving nerve function.

2.
Article in Chinese | WPRIM | ID: wpr-847767

ABSTRACT

BACKGROUND: Axons do not regenerate after central nervous system injury in mammals. It is mainly caused by the inhibitory microenvironment at the site of damage and the weakened self-regeneration ability. Studies have found that peripheral nervous system has certain regeneration ability after injury, so we explore the methods of central nervous system repair by studying the genes promoting peripheral nervous system regeneration. As one of the important protein kinase families of neurons, CaMKII up-regulation can improve the ability of neuron regeneration. Similarly, acute depletion of the Smad1 protein in adult mice also prevented axon regeneration in vivo. These genes can directly or indirectly regulate neuronal axon regeneration, but exactly how they regulate neuronal regeneration is still unclear. OBJECTIVE: To study the effects of CaMKII-Smad1 signaling pathway on axon regeneration of dorsal root ganglion neurons by intraperitoneal injection of CaMKII inhibitor and activator, and explored the mechanism of CaMKII and Smad1 in regulating axon regeneration of dorsal root ganglion neurons. METHODS: Totally 40 ICR mice were randomly divided into four groups: KN93 control group, KN93 experimental group, CdCl2 control group and CdCl2 experimental group. Dorsal root ganglion tissue was taken for in vitro culture after 7 days of continuous administration of CaMKII inhibitor KN93 and activator CdCl2. The length of axonal regeneration of dorsal root ganglion neurons was statistically analyzed after 3 days. Protein expression of p-Smad1 in dorsal root ganglion neurons was detected using western blot assay. RESULTS AND CONCLUSION: (1) Compared with the KN93 control group, axonal regeneration of dorsal root ganglion neurons was inhibited, and the p-Smad1 protein expression was decreased in the KN93 experimental group, showing significant differences. (2) Compared with the CdCl2 control group, axonal regeneration of dorsal root ganglion neurons was promoted, and p-Smad1 protein expression was increased in the CdCl2 experimental group, showing significant differences. (3) The results showed that the CaMKII-Smad1 signaling pathway had a regulatory effect on axonal regeneration of dorsal root ganglion neurons.

3.
J Biosci ; 2019 Dec; 44(6): 1-12
Article | IMSEAR | ID: sea-214212

ABSTRACT

Peripheral nerve injuries are frequently observed and successful treatment depends mainly on the injury type, location of thedamage, and the elapsed time prior to treatment. The regenerative capacity is limited only to the embryonic period in manymammalian tissues, but urodele amphibians do not lose this feature during adulthood. The main purpose of this study is todefine the recovery period after serious sciatic nerve damage of a urodele amphibian, Triturus ivanbureschi. Experimentaltransection damage was performed on the sciatic nerves of T. ivanbureschi specimens. The recovery period of sciatic nerveswere investigated by walking track analysis, electrophysiological recordings, and bottom-up proteomic strategies at different time points during a 35-day period. A total of 34 proteins were identified related to the nerve regeneration process.This study showed that the expression levels of certain proteins differ between distal and proximal nerve endings during theregeneration period. In distal nerve stumps, transport proteins, growth factors, signal, and regulatory molecules are highlyexpressed, whereas in proximal nerve stumps, neurite elongation proteins, and cytoskeletal proteins are highly expressed.

4.
Article in Chinese | WPRIM | ID: wpr-856711

ABSTRACT

The 'glial scar' has been widely studied in the regeneration of spinal cord injury (SCI). For decades, mainstream scientific concept considers glial scar as a 'physical barrier' to impede axonal regeneration after SCI. Moreover, some extracellular molecules produced by glial scar are also regarded as axonal growth inhibitors. With the development of technology and the progress of research, multiple lines of new evidence challenge the pre-existing traditional notions in SCI repair, including the role of glial scar. This review briefly reviewed the history, advance, and controversy of glial scar research in SCI repair since 1930s, hoping to recognize the roles of glial scar and crack the international problem of SCI regeneration.

5.
Chinese Pharmacological Bulletin ; (12): 1320-1324, 2017.
Article in Chinese | WPRIM | ID: wpr-614282

ABSTRACT

Aim To investigate the axonal regeneration effect of salidroside in MCAO rats and its potential mechanism.Methods Thirty-six healthy adult male Sprague-Dawley rats were randomly divided into three groups: sham, MCAO, MCAO+Sal groups.The rats were subjected to focal cerebral ischemia/reperfusion with suture-occluded method.Neurological deficit testing was performed with Zea Longa scale.The protein expression of p-Akt(Ser473), Akt, p-GSK-3β(Ser9), GSK-3β, p-CRMP-2(Thr514) and CRMP-2 in side cerebral ischemic tissues were determined using Western blot analysis.NF200 immunofluorescence staining was used to evaluate axonal regeneration.Results Compared with MCAO group,salidroside significantly improved the neurological deficit,up-regulated the protein expression of NF200,p-Akt and p-GSK-3β,and inhibited the protein expression of p-CRMP-2.Conclusions Salidroside improves neurological function recovery after focal cerebral/ischemic injury in rats,which may be associated with the up-regulation of phosphorylated Akt and GSK-3β and inhibition of phosphorylated CRMP-2,thereby promoting axonal regeneration.

6.
Article in Chinese | WPRIM | ID: wpr-666910

ABSTRACT

Objective To observe the effect of IcarisideⅡ (ICSⅡ) on spatial learning and memory impairments and axonal regeneration induced by chronic cerebral hypoperfusion (CCH) in rats.Methods 90 male SD rats were randomly divided into normal group,sham operation group,CCH group and ICS Ⅱ low,middle and high-dose treatment groups.The chronic cerebral hypoperfusion model was established by permanent bilateral common carotid artery occlusion.Then these rats in ICS Ⅱ low,middle and high-dose treatment groups were given ICS Ⅱ4,8 and 16 mg/(kg · d) by gavage on the 1st day after modeling.There were 5 rats in every group at each observing time(4,8 and 12 week).Morris water maze experiment was utilized to assess the escape latency and the target quadrant residence time while HE and immunohistochemistry analysis were applied to test the morphology change and expressions of GAP-43,MAP-2 and Nogo-A in hippocampal CA 1.Results Compared with those of sham operation groups at 4,8 and 12 week respectively,the escape latency in CCH group were significantly prolonged(40.02±4.95) s,(42.29±5.75) s,(53.68±6.14) s vs (26.43±2.68) s,(26.84±2.06) s,(31.53±4.12) s,P<0.05;the target quadrant residence time were significantly reduced(28.53±2.40) s,(28.02±4.28) s,(22.60±4.03) s vs (33.34±2.89) s,(33.31 ±4.14) s,(31.63±2.20)s,P<0.05);the expressions of GAP-43 and Nogo-A were increased with that of MAP-2 reduced(P<0.05).Meanwhile,the neuropathological changes with more denatured neurons and less normal neurons were found in hippocampal CA1.However,compared with those of CCH group,the escape latency of ICS Ⅱ middle and high-dose groups (30.58±3.03) s,(29.19±4.23) s,(38.77±5.80) s;(28.90±2.98) s,(26.91 ±6.63) s,(36.51 ±3.98) s) were shortened (P<0.05);the target quadrant residence time (32.54± 3.41) s,(32.69±3.47) s,(28.27±3.57) s;(32.69±3.54) s,(33.20±4.29) s,(28.07±4.04) s) were increased (P< 0.05);the expression of Nogo-A was decreased while those of GAP-43 and MAP-2 were conversely increased (P<0.05).Moreover,few denatured neurons were observed in hippocampal CA1.But there were no differences for those indexs between CCH group and ICS Ⅱ low-dose treatment groups (P>0.05).Compared with those in 8 week and 4 week,the escape latency and the target quadrant residence time were prolonged and reduced with the expression of Nogo-A increased in all groups except normal group and sham operation group(P<0.05),the expressions of GAP-43 and MAP-2 were decreased in CCH group and ICS Ⅱ low-dose treatment group(P<0.05),but there were no significant differences in ICS Ⅱ middle and high-dose treatment groups at 12 week(P>0.05).However,there were no statistical significance of all indexes between 8 week and 4 week(P>0.05).Conclusion ICS Ⅱ can improve the spatial learning and memory in chronic cerebral hypoperfusion rats,which may be achieved by neuroprotective effects and reducing the expression of Nogo-A consequently promotes the regeneration of axons.

7.
Int. j. morphol ; 34(3): 1151-1157, Sept. 2016. ilus
Article in English | LILACS | ID: biblio-829001

ABSTRACT

This study proposes the use of a porous polyethylene (PPE) tube as the conductive element in the regeneration in the sciatic nerve sectioning and evaluates the use of fill with autologous fat. The subject was divided randomly into five groups, 3 control and 2 experimental (PPE tube graft with/ without autologous fat). Each group was selected for functional, histological and morphometric evaluation of the sciatic nerve. Functional analysis of the sciatic nerve occurred through the "footprint" values near -100 refer sectioned sciatic nerve, near 0 (zero) refer to control group. On histological analysis of the experimental groups lots of dense connective tissue replacing nerve tissue was observed. In morphometric analysis the group EGPGf got higher performance in all of variables. The use of PPE has shown promise in nerve regeneration with favorable results when associate with fat as a trophic factor in the regeneration.


Este estudio propone el uso de un tubo de polietileno poroso (PPE) como elemento conductor en la regeneración del nervio ciático seccionado y evaluar el uso de relleno con grasa autóloga. Al azar se formaron cinco grupos, 3 y 2 de control experimental (PPE prótesis tubular con / sin grasa autóloga). Cada grupo fue seleccionado para estudiar la forma funcional, histológica y evaluación morfométrica del nervio ciático. Un análisis funcional del nervio ciático se produjo a través de los valores de "huella", cerca de -100 se refiere al nervio ciático seccionado; cerca de 0 (cero) se refiere al grupo control. En el análisis histológico de los grupos experimentales se observó una gran cantidad de tejido conjuntivo denso que sustituye el tejido nervioso. En el análisis morfométrico, el grupo experimental de injerto de polietileno lleno de grasa (EGPGf) obtuvo un mayor rendimiento en todas las variables. El uso de PPE ha mostrado ser prometedor en la regeneración del nervio, con resultados favorables cuando se asocia con la grasa como un factor trófico en la regeneración.


Subject(s)
Animals , Rats , Nerve Regeneration/physiology , Sciatic Nerve/physiology , Sciatic Nerve/surgery , Fats , Polyethylene , Prospective Studies , Prostheses and Implants , Sciatic Nerve/anatomy & histology , Transplantation, Autologous
8.
Article in Chinese | WPRIM | ID: wpr-496365

ABSTRACT

Objective To explore the effect of peripheral nerve electrical stimulation on axon regeneration after spinal cord injury (SCI) in rats. Methods Nighty-two healthy Sprague-Dawley rats were randomly divided into blank control group (n=12), control group (n=40) and experimental group (n=40). All groups were suffered NYU impaction to prepare T8 SCI models, the control group and the experimental group implanted stimulating electrode on the sciatica nerve. The experimental group received electric intervention in addition. They were evaluated with BBB score one day, one week, two weeks, four weeks and eight weeks after modeling; and with motor evoked potentials (MEP) one week, two weeks, four weeks and eight weeks after modeling. Morphological changes and the expression of neurofilament pro-tein (NF)-200 and glial fibers acid protein (GFAP) were observed by HE staining and immunohistochemistry one week, two weeks, four weeks and eight weeks after modeling. Results There was no significant difference in BBB scores among three groups (P>0.05) in all the time points except eight weeks (P0.05), however, there was significant difference two weeks, four weeks and eight weeks after modeling (P0.05), but was different two weeks, four weeks and eight weeks after modeling (P0.05). Conclusion Implantable peripheral nerve electrical stimulation can improve conduction function and motor function in rats with SCI. And it may promote axonal regeneration of the injured segments.

9.
Article in Chinese | WPRIM | ID: wpr-475815

ABSTRACT

Objective To observe the dynamic expression of Nogo receptor (NgR) in spinal cord of rats after spinal cord injury. Meth-ods 108 Sprague-Dawley rats were randomly assigned into normal group, sham operated group and model group, with 36 rats in each group. The model of spinal cord injury was established with the modified Allen's method. The rats were killed 24 h, 3 days, 7 days and 14 days re-spectively after intervention (9 rats from each group), and expression of NgR in the spinal cord tissue of the rats was detected with immuno-histochemistry and Western blotting, and expression of NgR mRNA was detected with fluorescence quantitative PCR. Results There was no significant change in the expression of NgR in the normal group and the sham operated group (P>0.05). The expression of protein and mRNA of NgR was less in the model group 24 h after modeling, dropped to the lowest on the 3rd day, then rapidly peaked on the 7th day, and gradually declined on the 14th day after spinal cord injury. Compared with the normal group, there were significant differences in ex-pression of NgR in immunohistochemistry and Western blotting in the model group at each time point after spinal cord injury (P<0.05). Compared with the sham operated group, there were significant differences in expression of NgR mRNA in the model group at each time point after spinal cord injury (P<0.01). Conclusion The expression of NgR and mRNA peaks on the 7th day after spinal cord injury in the rats, and maintains at high level for a long time, which may associated with the difficulty of axonal regeneration after spinal cord injury.

10.
Article in Chinese | WPRIM | ID: wpr-454876

ABSTRACT

Objective To explore the effect of Jisuikang on neural functional recovery, and expression of brain-derived neurotrophic fac-tor (BDNF) protein and mRNA level after spinal cord injury (SCI). Methods 144 female Sprague-Dawley rats, weighted 180 to 220 g, were used for experiment. 24 rats were randomly extracted into sham group (Group A), which had their vertebral plates and spines bitten away on-ly. The others were randomly divided into model group (Group B), prednison group (Group C), and high, middle and low doses of Jisuikang group (Groups D to F) after SCI, 24 rats in each group. Group C was given 0.06 g/(kg?d) prednison, and Groups D to F were given 50, 25 and 12.5 g/(kg?d) Jisuikang respectively, which were given 20 ml/(kg?d) volume by intragastric administration. Groups A and B were given the same volume of normal saline (NS). The Basso-Beattie-Bresnahan (BBB) scores and oblique board test were applied to test the postoper-ative results 24 hours, 3, 7 and 14 days after SCI. The rats were executed and the spinal cord tissues were extracted 3, 7 and 14 days after SCI. Immunohistochemistry, Western blotting and RQ-PCR were applied to test the expression of protein and mRNA of BDNF. Results BBB scores and angle of oblique board test were significantly lower in Groups B to F than in Group A 24 hours after SCI (P0.05). The results of RQ-PCR showed that prednisone and Jisuikang promot-ed the expression of BDNF mRNA. Group C (prednisone) had a most obvious effect at the beginning while Group E was better than Group C 14 days after SCI. Conclusion Jisuikang can promote the neural functional recovery and the expression of BDNF on both protein and mRNA level in SCI rats.

11.
Experimental Neurobiology ; : 238-245, 2014.
Article in English | WPRIM | ID: wpr-50922

ABSTRACT

Aucubin is an iridoid glycoside with a wide range of biological activities, including anti-inflammatory, anti-microbial, anti-algesic as well as anti-tumor activities. Recently, it has been shown that aucubin prevents neuronal death in the hippocampal CA1 region in rats with diabetic encephalopathy. In addition, it has protective effects on H2O2-induced apoptosis in PC12 cells. We have shown here that aucubin promotes neuronal differentiation and neurite outgrowth in neural stem cells cultured primarily from the rat embryonic hippocampus. We also investigated whether aucubin facilitates axonal elongation in the injured peripheral nervous system. Aucubin promoted lengthening and thickness of axons and re-myelination at 3 weeks after sciatic nerve injury. These results indicate that administration of aucubin improved nerve regeneration in the rat model of sciatic nerve injury, suggesting that aucubin may be a useful therapeutic compound for the human peripheral nervous system after various nerve injuries.


Subject(s)
Animals , Apoptosis , Axons , CA1 Region, Hippocampal , Hippocampus , Humans , Models, Animal , Nerve Regeneration , Neural Stem Cells , Neurites , Neurons , PC12 Cells , Peripheral Nervous System , Rats , Regeneration , Sciatic Nerve
12.
Article in English | WPRIM | ID: wpr-74499

ABSTRACT

Axonal regeneration is critical for functional recovery following neural injury. In addition to intrinsic differences between regenerative responses of axons in peripheral versus central nervous systems, environmental factors such as glial cells and related molecules in the extracellular matrix (ECM) play an important role in axonal regeneration. Schwann cells in the peripheral nervous system (PNS) are recognized as favorable factors that promote axonal regeneration, while astrocytes and oligodendrocytes in the central nervous system (CNS) are not. In this review, we evaluate the roles of Schwann cells and astrocytes in axonal regeneration and examine recent evidence that suggests a dual function of astrocytes in regenerative responses. We also discuss the role of Cdc2 pathways in axonal regeneration, which is commonly activated in Schwann cells and astrocytes. Greater insight on the roles of glial cells in axonal regeneration is key to establishing baseline interventions for improving functional recovery following neural injury.


Subject(s)
Astrocytes , Axons , Central Nervous System , Extracellular Matrix , Neuroglia , Oligodendroglia , Peripheral Nervous System , Regeneration , Schwann Cells
13.
Article in Chinese | WPRIM | ID: wpr-404107

ABSTRACT

Objective To investigate the change of serum Nogo-A protein in patients with acute closed brain injury, and explore its relationship with the severity of neuronal damage and prognosis. Methods Thirty-one patients with acute closed brain injury were enrolled. Venous blood samples (2 mL) were obtained 1, 3 and 5 d after injury. Serum concentrations of Nogo-A protein were determined by ELISA. Patients were divided into mild (n =7), moderate (n = 10) and severe (n = 14) injury groups according to Glasgow coma score (GCS), and were divided into favorable prognosis (n = 23) and poor prognosis (n = 8) groups according to Glasgow outcome score (GOS). Another 20 healthy adults were served as controls. Results The mass concentrations of serum Nogo-A protein in mild, moderate and severe injury groups 1, 3, 5 d after injury were significantly higher than those in control group (P < 0.01), and the mass concentrations of serum Nogo-A protein in moderate and severe injury groups 1, 3, 5 d after injury were significantly higher than those in mild injury group (P <0.05, P <0.01). The mass concentrations of serum Nogo-A protein 1, 3, 5 d after injury were significantly higher in poor prognosis group than those in favourable prognosis group (P < 0.01). Conclusion Serum Nogo-A protein level significantly increases after brain injury, and is related to the degree of injury and prognosis.

14.
Article in Chinese | WPRIM | ID: wpr-387828

ABSTRACT

Objective To research the effects of neural stem cells (NSCs) transplantation on the neurological function improvement and neural survive and axonal regeneration in traumatic rat brain. Methods NSCs were cultured in vitro, labeled with hochest and transplanted into rat brain injured area by weight-dropping. Neurological severity scores(NSS) tested the functions at the 0,3,7,14 day post-injury. Immunofluorescence was used to detect the expressions of NeuN cells and GAP-43. Results There was significant difference in NSS between NSCs transplantion group and brain injury group(4.38 ±0.74 vs 5.50 ± 1.07, P<0.01) at 7th day. There were a significant increase in neural number (51.46 ± 3. 303 vs 42.83 ± 5. 401, P < 0.01 ) ), and GAP-positive axons ( 13.3 ± 1.7 vs 8.7 ± 1.1, P<0.01 ) in NSCs transplantion group than in control group. Conclusion NSCs have an effects on the neurological improvement in brain injured rat. This may be associated to the increase in number of the neurons and local axons.

15.
Article in Korean | WPRIM | ID: wpr-156606

ABSTRACT

STUDY DESIGN: This is a literature review OBJECTIVES: We wanted to provide updated information for spine clinicians on the pathophysiology, medical treatment and the timing of surgical treatment after acute spinal cord injury. SUMMARY OF LITERATURE REVIEW: There are many studies concerned with understanding the mechanisms of injury and improving the neurologic function after acute spinal cord injury. However, methylprednisolone therapy has been used only recently for the treatment of this malady. MATERIALS AND METHODS: We conducted a literature review, with a particular focus on the development of pathophysiology and the emerging pharmacologic treatment of acute spinal cord injury, and on the effectiveness of performing early decompression. RESULTS: After primary mechanical impact, a complex cascade of secondary injury follows during acute spinal cord injury. Neuroprotection and axonal regeneration are the main strategies to treat spinal cord injury. Beyond methylprednisolone, a number of other pharmacological treatments have been studied for the acute treatment of spinal cord injury. Animal studies support early decompression of the injured cord. Although there is no standard regarding the timing of decompression, there are many advantages of performing early decompression in human. CONCLUSION: Although a number of pharmacological therapies seem to have neuroprotective potential, high-dose methyprednisolone therapy is the only clinically approved treatment for acute spinal cord injury. Urgent decompression for acute spinal cord injury remains a reasonable practice option.


Subject(s)
Animals , Axons , Decompression , Methylprednisolone , Regeneration , Spinal Cord , Spinal Cord Injuries , Spine
16.
Article in Chinese | WPRIM | ID: wpr-401331

ABSTRACT

As a molecular switch,Rho can be transformed between the inactive GDP-bound form and the active GTP-bound form,transfering signals to downstream effector Rho kinase (ROCK),mediating specific biological effects,and participating in various neurological diseases, such as the pathological processes of ischemic stroke,cerebral vasospasm,and axonal regeneration after spinal cord injury.The application of ROCK inhibitor in the treatment of neurological diseases has achieved satisfactory effect.Rho/ROCK is expected to become a novel therapeutic target.

17.
Article in Chinese | WPRIM | ID: wpr-547318

ABSTRACT

[Objective]To discuss axonal regeneration and functional recovery after rat's spinal cord injury with transplantation of human cord blood mononuclear cells(HCMNCs).[Method]Thirty injured spinal cord models of Wistar rat were made with Impactor ModelⅡat T10 and then divided into 3 groups randomly and evenly(DMEM control,HCMNCs grafted 3 days post injury and HCMNCs grafted 14 days post injury).Hindlimb functional recovery of rats in each group was evaluated by BBB locomotor functional scale.HE,immunohistochemistry staining,and BDA anterograde tracing were used to observe the axonal regeneration in the lesion site.[Result]Compared with control group,grafted HCMNCs exerted larger effect on promoting nerve regeneration and functional recovery.Rats in the group of HCMNCs grafted 14 days post-injury had better functional recovery than those in HCMNCs grafted 3 days post-injury group.Statistic difference existed among three groups(P

18.
Article in Korean | WPRIM | ID: wpr-644789

ABSTRACT

PURPOSE: The purpose of this study was to compare the degree of axonal regeneration between end-to-end and terminolateral neurorrhaphy, and determine the degree of nerve regeneration for each method of terminolateral neurorrhaphy. MATERIALS AND METHODS: Thirty-two Sprague-Dawley rats (N=64) were divided into four experimental groups: End-to-end neurorrhaphy (Group 1), end-to-side neurorrhaphy without removal of the epineurial sheath (Group 2), with an epineurial window (Group 3), and with an epineurial window combined with tibial motor axonotomy (Group 4). Each group were sacrificed after needle electromyography at 2, 4, 8, and 12 weeks and transmission electron microscopy was performed to observe the histologic findings of coaptation sites. The weights of tibialis anterior muscles were measured. RESULTS: The amplitude of the compound motor action potential was always lowest in group 4, and there was no statistically significant difference between groups 2 and 3 in terms of the ratio of myelinated to non-myelinated nerve fiber. However, there was a statistically significant difference between groups 2 and 3 in terms of the thickness of the myelin sheath. The tibialis anterior muscle weight in Group 1 increased more so than in the other groups and there was statistically significant difference between group 1 and 4. CONCLUSION: End-to-end neurorrhaphy is the best method of nerve repair, and there was no statistically significant difference between epineurial and epineurial window coaptation in end-to-side neurorrhapy.


Subject(s)
Action Potentials , Animals , Axons , Electromyography , Microscopy, Electron, Transmission , Muscles , Myelin Sheath , Needles , Nerve Fibers , Nerve Regeneration , Rats , Rats, Sprague-Dawley , Regeneration , Weights and Measures
19.
In. II International Congress on Neuroregeneration. Proceedings (selected papers). Rio de Janeiro, UFRJ, 2004. p.65-71, ilus.
Monography in English | LILACS | ID: lil-682595

ABSTRACT

Damage to the adult mammalian optic nerve (ON) usually results in the degeneration of the ON and death of retinal ganglion cells (RGCs), leading to permanent loss of visual functions. New strategies, especially the transplantation of a peripheral nerve (PN) to the retina or transected ON, have been created to promote the neuronal survival and axonal regeneration of axotomized RGCs. In this review, we focus on how a PN and other factors are used to overcome the unfavorable extrinsic CNS environment and the lack of trophic factors, and upregulate the intrinsic growth potential of the axotomized neurons since recent studies suggest that the lack of intrinsic growth potential in the CNS neurons is also an important factor contributing to the failure of CNS regeneration.


Subject(s)
Neurology , Optic Nerve , Peripheral Nerves , Regeneration , Retinal Ganglion Cells , Retina/transplantation
20.
Article in Chinese | WPRIM | ID: wpr-675522

ABSTRACT

Objective To prove the extracellular ATP attracts the axonal regeneration after peripheral nerve injury via the ATP receptor Methods The sciatic nerve defects had been made in 10 female Sprague Danley rats and repaired by"Y" form silicon tube The single arm of the"Y" form tube were sutured with the proxma the sciatic nerve and the other two end of silicon tube sutured by paralled or cross method so as to differentiate the experimental side and control side, 1mmol/L 10 ?l ATP and 1mmol/L 10 ?m ATP+ 0 2mg/ml Suramin were injected differently into two arms of left side and 10 ?l physiological saling and 10 ?l 0 2mg/ml Suramin injected differently into two arms of right dide The silicon tube were removed after eight weeks and examine the form and number of myelinated tibers as well as the quanlity of the myelinated sheath Results In the left sides regeneration axon were tuned into the silicon tubes containing the ATP and there were not axon regeneration in the silicon tube contained the ATP and there were not axon regeneration in the silicon tube contained ATP+ Suramin In the right sides the regeneration axon were found only three tubes contained suramin and seven tubes contained physiological saline Conclusions The results demonstrated that the suramin inhibited the axon reduction of the extracellular ATP completely

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