Loading...

Table of Content

    17 February 2015, Volume 10 Issue 2 Previous Issue    Next Issue
    For Selected: Toggle Thumbnails
    Hope on the (fruit) fy: the Drosophila wing paradigm of axon injury
    Yanshan Fang, Nancy M. Bonini
    2015, 10 (2):  173-175.  doi: 10.4103/1673-5374.152359
    Abstract ( 377 )   PDF (397KB) ( 741 )   Save
    Related Articles | Metrics
    Understanding axon guidance: attraction, repulsion, and statistical physics
    William G. Wadsworth
    2015, 10 (2):  176-179.  doi: 10.4103/1673-5374.152360
    Abstract ( 403 )   PDF (894KB) ( 704 )   Save
    Related Articles | Metrics
    Neural stem cell replacement: a possible therapy for neurodevelopmental disorders?
    Michael Telias, Dalit Ben-Yosef
    2015, 10 (2):  180-182.  doi: 10.4103/1673-5374.152361
    Abstract ( 273 )   PDF (301KB) ( 687 )   Save
    Related Articles | Metrics
    Withania somnifera: a pre-clinical study on neuroregenerative therapy for stroke
    Aparna Raghavan, Zahoor A. Shah
    2015, 10 (2):  183-185.  doi: 10.4103/1673-5374.152362
    Abstract ( 234 )   PDF (236KB) ( 710 )   Save
    Related Articles | Metrics
    Application of iron oxide anoparticles in neuronal tissue engineering
    Ofra Ziv-Polat, Shlomo Margel, Abraham Shahar
    2015, 10 (2):  189-191.  doi: 10.4103/1673-5374.152364
    Abstract ( 320 )   PDF (922KB) ( 1030 )   Save
    Related Articles | Metrics
    Physiological signifcance of Rag1 in retinal ganglion cell death
    Takuma Hayashi, Toshinori Murata
    2015, 10 (2):  192-194.  doi: 10.4103/1673-5374.152365
    Abstract ( 216 )   PDF (398KB) ( 708 )   Save
    Related Articles | Metrics
    Reorganization of spinal neural circuitry and functional recovery after spinal cord injury
    Raffaele Nardone, Eugen Trinka
    2015, 10 (2):  201-202.  doi: 10.4103/1673-5374.152368
    Abstract ( 323 )   PDF (142KB) ( 774 )   Save
    Related Articles | Metrics
    Antagonizing amyloid-β/calcium-sensing receptor signaling in human astrocytes and neurons: a key to halt Alzheimer’s disease progression?
    Ilaria Dal Prà, Anna Chiarini, Ubaldo Armato
    2015, 10 (2):  213-218.  doi: 10.4103/1673-5374.152373
    Abstract ( 257 )   PDF (384KB) ( 749 )   Save

    Astrocytes’ roles in late-onset Alzheimer’s disease (LOAD) promotion are important, since they survive soluble or fibrillar amyloid-β peptides (Aβs) neurotoxic effects, undergo alterations of intracellular and intercellular Ca2+ signaling and gliotransmitters release via the Aβ/α7-nAChR (α7-nicotinic acetylcholine receptor) signaling, and overproduce/oversecrete newly synthesized Aβ42 oligomers, NO, and VEGF-A via the Aβ/CaSR (calcium-sensing receptor) signaling. Recently, it was suggested that the NMDAR (N-methyl-D-aspartate receptor) inhibitor nitromemantine would block the synapse-destroying effects of Aβ/α7-nAChR signaling. Yet, this and the progressive extracellular accrual and spreading of Aβ42 oligomers would be stopped well upstream by NPS 2143, an allosteric CaSR antagonist (calcilytic).

    Related Articles | Metrics
    Inhibition of inflammatory cytokines after early decompression may mediate recovery of neurological function in rats with spinal cord injury
    Jia-bing Xie, Xin Zhang, Quan-hui Li, Zhu-jun Xu
    2015, 10 (2):  219-224.  doi: 10.4103/1673-5374.152374
    Abstract ( 206 )   PDF (5158KB) ( 652 )   Save

    A variety of inflammatory cytokines are involved in spinal cord injury and influence the recovery of neuronal function. In the present study, we established a rat model of acute spinal cord injury by cerclage. The cerclage suture was released 8 or 72 hours later, to simulate decompression surgery. Neurological function was evaluated behaviorally for 3 weeks after surgery, and tumor necrosis factor α immunoreactivity and apoptosis were quantified in the region of injury. Rats that underwent decompression surgery had significantly weaker immunoreactivity of tumor necrosis factor α and significantly fewer apoptotic cells, and showed faster improvement of locomotor function than animals in which decompression surgery was not performed. Decompression at 8 hours resulted in significantly faster recovery than that at 72 hours. These data indicate that early decompression may improve neurological function after spinal cord injury by inhibiting the expression of tumor necrosis factor α.

    Related Articles | Metrics
    Nogo-A expression dynamically varies after spinal cord injury
    Jian-wei Wang, Jun-feng Yang, Yong Ma, Zhen Hua, Yang Guo, Xiao-lin Gu, Ya-feng Zhang
    2015, 10 (2):  225-229.  doi: 10.4103/1673-5374.152375
    Abstract ( 250 )   PDF (862KB) ( 1030 )   Save

    The mechanism involved in neural regeneration after spinal cord injury is unclear. The myelin-derived protein Nogo-A, which is specific to the central nervous system, has been identified to negatively affect the cytoskeleton and growth program of axotomized neurons. Studies have shown that Nogo-A exerts immediate and chronic inhibitory effects on neurite outgrowth. In vivo, inhibitors of Nogo-A have been shown to lead to a marked enhancement of regenerative axon extension. We established a spinal cord injury model in rats using a free-falling weight drop device to subsequently investigate Nogo-A expression. Nogo-A mRNA and protein expression and immunoreactivity were detected in spinal cord tissue using real-time quantitative PCR, immunohistochemistry and western blot analysis. At 24 hours after spinal cord injury, Nogo-A protein and mRNA expression was low in the injured group compared with control and sham-operated groups. The levels then continued to drop further and were at their lowest at 3 days, rapidly rose to a peak after 7 days, and then gradually declined again after 14 days. These changes were observed at both the mRNA and protein level. The transient decrease observed early after injury followed by high levels for a few days indicates Nogo-A expression is time dependent. This may contribute to the lack of regeneration in the central nervous system after spinal cord injury. The dynamic variation of Nogo-A should be taken into account in the treatment of spinal cord injury. 

    Related Articles | Metrics
    Edaravone combined with Schwann cell transplantation may repair spinal cord injury in rats
    Shu-quan Zhang, Min-fei Wu, Zhe Piao, Jin Yao, Ji-hai Li, Xin-gang Wang, Jun Liu
    2015, 10 (2):  230-236.  doi: 10.4103/1673-5374.152376
    Abstract ( 201 )   PDF (1447KB) ( 671 )   Save

    Edaravone has been shown to delay neuronal apoptosis, thereby improving nerve function and the microenvironment after spinal cord injury. Edaravone can provide a favorable environment for the treatment of spinal cord injury using Schwann cell transplantation. This study used rat models of complete spinal cord transection at T9. Six hours later, Schwann cells were transplanted in the head and tail ends of the injury site. Simultaneously, edaravone was injected through the caudal vein. Eight weeks later, the PKH-26-labeled Schwann cells had survived and migrated to the center of the spinal cord injury region in rats after combined treatment with edaravone and Schwann cells. Moreover, the number of PKH-26-labeled Schwann cells in the rat spinal cord was more than that in rats undergoing Schwann cell transplantation alone or rats without any treatment. Horseradish peroxidase retrograde tracing revealed that the number of horseradish peroxidase-positive nerve fibers was greater in rats treated with edaravone combined with  Schwann cells than in rats with Schwann cell transplantation alone. The results demonstrated that lower extremity motor function and neurophysiological function were better in rats treated with edaravone and Schwann cells than in rats with Schwann cell transplantation only. These data confirmed that Schwann cell transplantation combined with edaravone injection promoted the regeneration of nerve fibers of rats with spinal cord injury and improved neurological function.

    Related Articles | Metrics
    Electroacupuncture improves microcirculation and neuronal morphology in the spinal cord of a rat model of intervertebral disc extrusion
    Dai-xun Jiang, Zhi-song Lu, Ge-bin Li, Sheng-yong Sun, Xiang Mu, Peter Lee, Wu Chen
    2015, 10 (2):  237-243.  doi: 10.4103/1673-5374.152377
    Abstract ( 210 )   PDF (2178KB) ( 641 )   Save

    Most studies on spinal cord neuronal injury have focused on spinal cord tissue histology and the expression of nerve cell damage and repair-related genes. The importance of the microcirculation is often ignored in spinal cord injury and repair research. Therefore, in this study, we established a rat model of intervertebral disc extrusion by inserting a silica gel pad into the left ventral surface of T13. Electroacupuncture was used to stimulate the bilateral Zusanli point (ST36) and Neiting point (ST44) for 14 days. Compared with control animals, blood flow in the first lumbar vertebra (L1) was noticeably increased in rats given electroacupuncture. Microvessel density in the T13 segment of the spinal cord was increased significantly as well. The number of normal neurons was higher in the ventral horn of the spinal cord. In addition, vacuolation in the white matter was lessened. No obvious glial cell proliferation was visible. Furthermore, hindlimb motor function was improved significantly. Collectively, our results suggest that electroacupuncture can improve neuronal morphology and microcirculation, and promote the recovery of neurological functions in a rat model of intervertebral disc extrusion.

    Related Articles | Metrics
    Prevention against diffuse spinal cord astrocytoma: can the Notch pathway be a novel treatment target?
    Jian-jun Sun, Zhen-yu Wang, Ling-song Li, Hai-yan Yu, Yong-sheng Xu, Hai-bo Wu, Yi Luo, Bin Liu, Mei Zheng, Jin-long Mao, Xiao-hui Lou
    2015, 10 (2):  244-251.  doi: 10.4103/1673-5374.152378
    Abstract ( 170 )   PDF (2505KB) ( 980 )   Save

    This study was designed to investigate whether the Notch pathway is involved in the development of diffuse spinal cord astrocytomas. BALB/c nude mice received injections of CD133+ and CD133− cell suspensions prepared using human recurrent diffuse spinal cord astrocytoma tissue through administration into the right parietal lobe. After 7–11 weeks, magnetic resonance imaging was performed weekly. Xenografts were observed on the surfaces of the brains of mice receiving the CD133+ cell suspension, and Notch-immunopositive expression was observed in the xenografts. By contrast, no xenografts appeared in the identical position on the surfaces of the brains of mice receiving the CD133− cell suspension, and Notch-immunopositive expression was hardly detected either. Hematoxylin-eosin staining and immunohistochemical staining revealed xenografts on the convex surfaces of the brains of mice that underwent CD133+ astrocytoma transplantation. Some sporadic astroglioma cells showed pseudopodium-like structures, which extended into the cerebral white matter. However, it should be emphasized that the subcortex xenograft with Notch-immunopositive expression was found in the fourth mouse received injection of CD133− astrocytoma cells. However, these findings suggest that the Notch pathway plays an important role in the formation of astrocytomas, and can be considered a novel treatment target for diffuse spinal cord astrocytoma.

    Related Articles | Metrics
    A 2-year follow-up survey of 523 cases with peripheral nerve injuries caused by the earthquake in Wenchuan, China
    Chun-qing He, Li-hai Zhang, Xian-fei Liu, Pei-fu Tang
    2015, 10 (2):  252-259.  doi: 10.4103/1673-5374.152379
    Abstract ( 195 )   PDF (1367KB) ( 860 )   Save

    We performed a 2-year follow-up survey of 523 patients with peripheral nerve injuries caused by the earthquake in Wenchuan, Sichuan Province, China. Nerve injuries were classified into three types: type I injuries were nerve transection injuries, type II injuries were nerve compression injuries, and type III injuries displayed no direct neurological dysfunction due to trauma. In this study, 31 patients had type I injuries involving 41 nerves, 419 had type II injuries involving 823 nerves, and 73 had type III injuries involving 150 nerves. Twenty-two patients had open transection nerve injury. The restoration of peripheral nerve function after different treatments was evaluated. Surgical decompression favorably affected nerve recovery. Physiotherapy was effective for type I and type II nerve injuries, but not substantially for type III nerve injury. Pharmacotherapy had little effect on type II or type III nerve injuries. Targeted decompression surgery and physiotherapy contributed to the effective treatment of nerve transection and compression injuries. The Louisiana State University Health Sciences Center score for nerve injury severity declined with increasing duration of being trapped. In the first year after treatment, the Louisiana State University Health Sciences Center score for grades 3 to 5 nerve injury increased by 28.2% to 81.8%. If scores were still poor (0 or 1) after a 1-year period of treatment, further treatment was not effective.

    Related Articles | Metrics
    Human amniotic epithelial cell transplantation for the repair of injured brachial plexus nerve: evaluation of nerve viscoelastic properties
    Hua Jin, Qi Yang, Feng Ji, Ya-jie Zhang, Yan Zhao, Min Luo
    2015, 10 (2):  260-265.  doi: 4103/1673-5374.152380
    Abstract ( 176 )   PDF (926KB) ( 723 )   Save

    The transplantation of embryonic stem cells can effectively improve the creeping strength of nerves near an injury site in animals. Amniotic epithelial cells have similar biological properties as embryonic stem cells; therefore, we hypothesized that transplantation of amniotic epithelial cells can repair peripheral nerve injury and recover the creeping strength of the brachial plexus nerve. In the present study, a brachial plexus injury model was established in rabbits using the C6 root avulsion method. A suspension of human amniotic epithelial cells was repeatedly injected over an area 4.0 mm lateral to the cephal and caudal ends of the C6 brachial plexus injury site (1 × 106 cells/mL, 3 μL/injection, 25 injections) immediately after the injury. The results showed that the decrease in stress and increase in strain at 7,200 seconds in the injured rabbit C6 brachial plexus nerve were mitigated by the cell transplantation, restoring the viscoelastic stress relaxation and creep properties of the brachial plexus nerve. The forepaw functions were also significantly improved at 26 weeks after injury. These data indicate that transplantation of human amniotic epithelial cells can effectively restore the mechanical properties of the brachial plexus nerve after injury in rabbits and that viscoelasticity may be an important index for the evaluation of brachial plexus injury in animals.

    Related Articles | Metrics
    Early cyclosporin A treatment retards axonal degeneration in an experimental peripheral nerve injection injury model
    Ibrahim Erkutlu, Mehmet Alptekin, Sirma Geyik, Abidin Murat Geyik, Inan Gezgin, Abdulvahap Gök
    2015, 10 (2):  266-270.  doi: 10.4103/1673-5374.152381
    Abstract ( 176 )   PDF (717KB) ( 736 )   Save

    Injury to peripheral nerves during injections of therapeutic agents such as penicillin G potassium is common in developing countries. It has been shown that cyclosporin A, a powerful immunosuppressive agent, can retard Wallerian degeneration after peripheral nerve crush injury. However, few studies are reported on the effects of cyclosporin A on peripheral nerve drug injection injury. This study aimed to assess the time-dependent efficacy of cyclosporine-A as an immunosuppressant therapy in an experimental rat nerve injection injury model established by penicillin G potassium injection. The rats were randomly divided into three groups based on the length of time after nerve injury induced by cyclosporine-A administration (30 minutes, 8 or 24 hours). The compound muscle action potentials were recorded pre-injury, early post-injury (within 1 hour) and 4 weeks after injury and compared statistically. Tissue samples were taken from each animal for histological analysis. Compared to the control group, a significant improvement of the compound muscle action potential amplitude value was observed only when cyclosporine-A was administered within 30 minutes of the injection injury (P < 0.05); at 8 or 24 hours after cyclosporine-A administration, compound muscle action potential amplitude was not changed compared with the control group. Thus, early immunosuppressant drug therapy may be a good alternative neuroprotective therapy option in experimental nerve injection injury induced by penicillin G potassium injection.

    Related Articles | Metrics
    Ethanol extract of Oenanthe javanica increases cell proliferation and neuroblast differentiation in the adolescent rat dentate gyrus
    Bai Hui Chen, Joon Ha Park, Jeong Hwi Cho, In Hye Kim, Bich Na Shin, Ji Hyeon Ahn, Seok Joon Hwang, Bing Chun Yan, Hyun Jin Tae, Jae Chul Lee, Eun Joo Bae, Yun Lyul Lee, Jong Dai Kim
    2015, 10 (2):  271-276.  doi: 10.4103/1673-5374.152382
    Abstract ( 291 )   PDF (978KB) ( 836 )   Save

    Oenanthe javanica is an aquatic perennial herb that belongs to the Oenanthe genus in Apiaceae family, and it displays well-known medicinal properties such as protective effects against glutamate-induced neurotoxicity. However, few studies regarding effects of Oenanthe javanica on neurogenesis in the brain have been reported. In this study, we examined the effects of a normal diet and a diet containing ethanol extract of Oenanthe javanica on cell proliferation and neuroblast differentiation in the subgranular zone of the hippocampal dentate gyrus of adolescent rats using Ki-67 (an endogenous marker for cell proliferation) and doublecortin (a marker for neuroblast). Our results showed that Oenanthe javanica extract significantly increased the number of Ki-67-immunoreactive cells and doublecortin-immunoreactive neuroblasts in the subgranular zone of the dentate gyrus in the adolescent rats. In addition, the immunoreactivity of brain-derived neurotrophic factor was significantly increased in the dentate gyrus of the Oenanthe javanica extract-treated group compared with the control group. However, we did not find that vascular endothelial growth factor expression was increased in the Oenanthe javanica extract-treated group compared with the control group. These results indicate that Oenanthe javanica extract improves cell proliferation and neuroblast differentiation by increasing brain-derived neurotrophic factor immunoreactivity in the rat dentate gyrus.

    Related Articles | Metrics
    Cortical neurogenesis in adult rats after ischemic brain injury: most new neurons fail to mature
    Qing-quan Li, Guan-qun Qiao, Jun Ma, Hong-wei Fan, Ying-bin Li
    2015, 10 (2):  277-285.  doi: 10.4103/1673-5374.152383
    Abstract ( 162 )   PDF (3965KB) ( 1122 )   Save

    The present study examines the hypothesis that endogenous neural progenitor cells isolated from the neocortex of ischemic brain can differentiate into neurons or glial cells and contribute to neural regeneration. We performed middle cerebral artery occlusion to establish a model of cerebral ischemia/reperfusion injury in adult rats. Immunohistochemical staining of the cortex 1, 3, 7, 14 or 28 days after injury revealed that neural progenitor cells double-positive for nestin and sox-2 appeared in the injured cortex 1 and 3 days post-injury, and were also positive for glial fibrillary acidic protein. New neurons were labeled using bromodeoxyuridine and different stages of maturity were identified using doublecortin, microtubule-associated protein 2 and neuronal nuclei antigen immunohistochemistry. Immature new neurons coexpressing doublecortin and bromodeoxyuridine were observed in the cortex at 3 and 7 days post-injury, and semi-mature and mature new neurons double-positive for microtubule-associated protein 2 and bromodeoxyuridine were found at 14 days post-injury. A few mature new neurons coexpressing neuronal nuclei antigen and bromodeoxyuridine were observed in the injured cortex 28 days post-injury. Glial fibrillary acidic protein/bromodeoxyuridine double-positive astrocytes were also found in the injured cortex. Our findings suggest that neural progenitor cells are present in the damaged cortex of adult rats with cerebral ischemic brain injury, and that they differentiate into astrocytes and immature neurons, but most neurons fail to reach the mature stage.

    Related Articles | Metrics
    Point application with Angong Niuhuang sticker protects hippocampal and cortical neurons in rats with cerebral ischemia
    Dong-shu Zhang, Yuan-liang Liu, Dao-qi Zhu, Xiao-jing Huang, Chao-hua Luo
    2015, 10 (2):  286-291.  doi: 10.4103/1673-5374.152384
    Abstract ( 369 )   PDF (2841KB) ( 973 )   Save

    Angong Niuhuang pill, a Chinese materia medica preparation, can improve neurological functions after acute ischemic stroke. Because of its inconvenient application and toxic components (Cinnabaris and Realgar), we used transdermal enhancers to deliver Angong Niuhuang pill by modern technology, which expanded the safe dose range and clinical indications. In this study, Angong Niuhuang stickers administered at different point application doses (1.35, 2.7, and
    5.4 g/kg) were administered to the Dazhui (DU14), Qihai (RN6) and Mingmen (DU4) of rats with chronic cerebral ischemia, for 4 weeks. The Morris water maze was used to determine the learning and memory ability of rats. Hematoxylin-eosin staining and Nissl staining were used to observe neuronal damage of the cortex and hippocampal CA1 region in rats with chronic cerebral ischemia. The middle- and high-dose point application of Angong Niuhuang stickers attenuated neuronal damage in the cortex and hippocampal CA1 region, and improved the memory of rats with chronic cerebral ischemia with an efficacy similar to interventions by electroacupuncture at Dazhui (DU14), Qihai (RN6) and Mingmen (DU4). Our experimental findings indicate that point application with Angong Niuhuang stickers can improve cognitive function after chronic cerebral ischemia in rats and is neuroprotective with an equivalent efficacy to acupuncture.

    Related Articles | Metrics
    Brain activation and inhibition after acupuncture at Taichong and Taixi: resting-state functional magnetic resonance imaging
    Shao-qun Zhang, Yan-jie Wang, Ji-ping Zhang, Jun-qi Chen, Chun-xiao Wu, Zhi-peng Li, Jia-rong Chen, Huai-liang Ouyang, Yong Huang, Chun-zhi Tang
    2015, 10 (2):  292-297.  doi: 10.4103/1673-5374.152385
    Abstract ( 277 )   PDF (691KB) ( 1591 )   Save

    Acupuncture can induce changes in the brain. However, the majority of studies to date have focused on a single acupoint at a time. In the present study, we observed activity changes in the brains of healthy volunteers before and after acupuncture at Taichong (LR3) and Taixi (KI3) using resting-state functional magnetic resonance imaging. Fifteen healthy volunteers underwent resting-state functional magnetic resonance imaging of the brain 15 minutes before acupuncture, then received acupuncture at Taichong and Taixi using the nail-pressing needle insertion method, after which the needle was retained in place for 30 minutes. Fifteen minutes after withdrawal of the needle, the volunteers underwent a further session of resting-state functional magnetic resonance imaging, which revealed that the amplitude of low-frequency fluctuation, a measure of spontaneous neuronal activity, increased mainly in the cerebral occipital lobe and middle occipital gyrus (Brodmann area 18/19), inferior occipital gyrus (Brodmann area 18) and cuneus (Brodmann area 18), but decreased mainly in the gyrus rectus of the frontal lobe (Brodmann area 11), inferior frontal gyrus (Brodmann area 44) and the center of the posterior lobe of the cerebellum. The present findings indicate that acupuncture at Taichong and Taixi specifically promote blood flow and activation in the brain areas related to vision, emotion and cognition, and inhibit brain areas related to emotion, attention, phonological and semantic processing, and memory.

    Related Articles | Metrics
    Brain functional network connectivity based on a visual task: visual information processing-related brain regions are signifcantly activated in the task state
    Yan-li Yang, Hong-xia Deng, Gui-yang Xing, Xiao-luan Xia, Hai-fang Li
    2015, 10 (2):  298-307.  doi: 10.4103/1673-5374.152386
    Abstract ( 377 )   PDF (1247KB) ( 1638 )   Save

    It is not clear whether the method used in functional brain-network related research can be applied to explore the feature binding mechanism of visual perception. In this study, we investigated feature binding of color and shape in visual perception. Functional magnetic resonance imaging data were collected from 38 healthy volunteers at rest and while performing a visual perception task to construct brain networks active during resting and task states. Results showed that brain regions involved in visual information processing were obviously activated during the task. The components were partitioned using a greedy algorithm, indicating the visual network existed during the resting state. Z-values in the vision-related brain regions were calculated, confirming the dynamic balance of the brain network. Connectivity between brain regions was determined, and the result showed that occipital and lingual gyri were stable brain regions in the visual system network, the parietal lobe played a very important role in the binding process of color features and shape features, and the fusiform and inferior temporal gyri were crucial for processing color and shape information. Experimental findings indicate that understanding visual feature binding and cognitive processes will help establish computational models of vision, improve image recognition technology, and provide a new theoretical mechanism for feature binding in visual perception.

    Related Articles | Metrics
    Protective effects of a polysaccharide from Spirulina platensis on dopaminergic neurons in an MPTP-induced Parkinson’s disease model in C57BL/6J mice
    Fang Zhang, Jian Lu, Ji-guo Zhang, Jun-xia Xie
    2015, 10 (2):  308-313.  doi: 4103/1673-5374.152387
    Abstract ( 187 )   PDF (1584KB) ( 983 )   Save

    The present study aimed to determine whether a polysaccharide obtained from Spirulina platensis shows protective effects on dopaminergic neurons. A Parkinson’s disease model was established through the intraperitoneal injection of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) in C57BL/6J mice. Prior to the MPTP injection, some mice were pretreated with intraperitoneal injections of a polysaccharide derived from Spirulina platensis once daily for 10 days. The results showed that the immunoreactive staining and mRNA expression of the dopamine transporter and tyrosine hydroxylase, the rate-limiting enzyme in dopamine synthesis, in the substantia nigra, were significantly increased in mice pretreated with 800 mg/kg of the polysaccharide compared with those in MPTP-treated mice. The activities of superoxide dismutase and glutathione peroxidase in the serum and midbrain were also increased significantly in mice injected with MPTP after pretreatment with the polysaccharide from Spirulina platensis. By contrast, the activity of monoamine oxidase B in serum and midbrain maintained unchanged. These experimental findings indicate that the polysaccharide obtained from Spirulina platensis plays a protective role against the MPTP-induced loss of dopaminergic neurons in C57BL/6J mice, and that the antioxidative properties of this polysaccharide likely underlie its neuroprotective effect.

    Related Articles | Metrics
    MicroRNA-9 promotes the neuronal differentiation of rat bone marrow mesenchymal stem cells by activating autophagy
    Guang-yu Zhang, Jun Wang, Yan-jie Jia, Rui Han, Ping Li, Deng-na Zhu
    2015, 10 (2):  314-320.  doi: 10.4103/1673-5374.143439
    Abstract ( 174 )   PDF (1733KB) ( 943 )   Save

    MicroRNA-9 (miR-9) has been shown to promote the differentiation of bone marrow mesenchymal stem cells into neuronal cells, but the precise mechanism is unclear. Our previous study confirmed that increased autophagic activity improved the efficiency of neuronal differentiation in bone marrow mesenchymal stem cells. Accumulating evidence reveals that miRNAs adjust the autophagic pathways. This study used miR-9-1 lentiviral vector and miR-9-1 inhibitor to modulate the expression level of miR-9. Autophagic activity and neuronal differentiation were measured by the number of light chain-3 (LC3)-positive dots, the ratio of LC3-II/LC3, and the expression levels of the neuronal markers enolase and microtubule-associated protein 2. Results showed that LC3-positive dots, the ratio of LC3-II/LC3, and expression of neuron specific enolase and microtubule-associated protein 2 increased in the miR-9+ group. The above results suggest that autophagic activity increased and bone marrow mesenchymal stem cells were prone to differentiate into neuronal cells when miR-9 was overexpressed, demonstrating that miR-9 can promote neuronal differentiation by increasing autophagic activity.

    Related Articles | Metrics
    Is thalamocortical tract injury responsible for memory impairment in a patient with putaminal hemorrhage?
    Hyeok Gyu Kwon, Chul Hoon Chang, Sung Ho Jang
    2015, 10 (2):  321-322.  doi: 10.4103/1673-5374.152390
    Abstract ( 263 )   PDF (407KB) ( 712 )   Save
    Related Articles | Metrics
    Recovery of injured cingulum in a patient with traumatic brain injury
    Sung Ho Jang, Seong Ho Kim, Hyeok Gyu Kwon
    2015, 10 (2):  323-324.  doi: 10.4103/1673-5374.152391
    Abstract ( 278 )   PDF (430KB) ( 645 )   Save
    Related Articles | Metrics
    Right lower limb apraxia in a patient with left supplementary motor area infarction: intactness of the corticospinal tract confirmed by transcranial magnetic stimulation
    Min Cheol Chang, Min Ho Chun
    2015, 10 (2):  325-327.  doi: 10.4103/1673-5374.152389
    Abstract ( 143 )   PDF (290KB) ( 785 )   Save

    We reported a 50-year-old female patient with left supplementary motor area infarction who presented right lower limb apraxia and investigated the possible causes using transcranial magnetic stimulation. The patient was able to walk and climb stairs spontaneously without any assistance at 3 weeks after onset. However, she was unable to intentionally move her right lower limb although she understood what she supposed to do. The motor evoked potential evoked by transcranial magnetic stimulation from the right lower limb was within the normal range, indicating that the corticospinal tract innervating the right lower limb was uninjured. Thus, we thought that her motor dysfunction was not induced by motor weakness, and confirmed her symptoms as apraxia. In addition, these results also suggest that transcranial magnetic stimulation is helpful for diagnosing apraxia.

    Related Articles | Metrics
    Phrenic nerve transfer to the musculocutaneous nerve for the repair of brachial plexus injury: electrophysiological characteristics
    Ying Liu, Xun-cheng Xu, Yi Zou, Su-rong Li, Bin Zhang, Yue Wang
    2015, 10 (2):  328-333.  doi: 10.4103/1673-5374.152388
    Abstract ( 237 )   PDF (304KB) ( 766 )   Save

    Phrenic nerve transfer is a major dynamic treatment used to repair brachial plexus root avulsion. We analyzed 72 relevant articles on phrenic nerve transfer to repair injured brachial plexus that were indexed by Science Citation Index. The keywords searched were brachial plexus injury, phrenic nerve, repair, surgery, protection, nerve transfer, and nerve graft. In addition, we performed neurophysiological analysis of the preoperative condition and prognosis of 10 patients undergoing ipsilateral phrenic nerve transfer to the musculocutaneous nerve in our hospital from 2008 to 201 3 and observed the electromyograms of the biceps brachii and motor conduction function of the musculocutaneous nerve. Clinically, approximately 28% of patients had brachial plexus injury combined with phrenic nerve injury, and injured phrenic nerve cannot be used as a nerve graft. After phrenic nerve transfer to the musculocutaneous nerve, the regenerated potentials first appeared at 3 months. Recovery of motor unit action potential occurred 6 months later and became more apparent at 12 months. The percent of patients recovering ‘excellent’ and ‘good’ muscle strength in the biceps brachii was 80% after 18 months. At 12 months after surgery, motor nerve conduction potential appeared in the musculocutaneous nerve in seven cases. These data suggest that preoperative evaluation of phrenic nerve function may help identify the most appropriate nerve graft in patients with an injured brachial plexus. The functional recovery of a transplanted nerve can be dynamically observed after the surgery.

    Related Articles | Metrics
    Tumor cells undergoing direct lineage conversion to neurons: unnatural but useful?
    Yang-yang Jiang, Min Wei, Heng-zhu Zhang
    2015, 10 (2):  334-336.  doi: 10.4103/1673-5374.152392
    Abstract ( 246 )   PDF (173KB) ( 634 )   Save
    Related Articles | Metrics