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Application of electrophysiological methods to research of mammals circadian clock mechanism in vivo

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Lewandowski M. H., Blasiak T., Blasik T.
Postępy Higieny i Medycyny Doświadczalnej
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2000
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vol. 54
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issue 3
341-349
EN
The suprachiasmatic nuclei (SCN) of the hypothalamus and the intergeniculate leaflet (IGL) of the thalamic lateral geniculate complex are two main oscillators for circadian timing system. A lot of anatomical evidences indicated a strong neuronal connections between SCN and IGL. Relatively less, however, is know about the electrophysiology and functional interactions between SCN and IGL. The spontaneous firing rate of SCN neurons exhibits a remarkable circadian rhythm with a higher activity in the day and a lower at the night both in vivo and in vitro preparations. However, these rhythms my represent only clock output rather then the intrinsic clock mechanism. Last data described for the first time ultradian rhythmic neuronal oscillation recorded in vivo in the rat SCN and IGL. These isoperiodic phasic discharge probably constitute a basis necessary to generate circadian rhythms in mammals.
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Human mesenchymal stem cell transplantation promotes functional recovery following acute spinal cord injury in rats

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Lee K. H., Suh-Kim H., Choi J. S., Jeun S.-S., Kim E. J., Kim S.-S., Yoon D. H., Lee B. H.
Acta Neurobiologiae Experimentalis
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2007
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vol. 67
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issue 1
13-22
EN
Many attempts have been made in animals to produce cellular regeneration in the spinal cord using a variety of transplanted cell types. The present study was to investigate whether transplantation of human mesenchymal stem cells (hMSCs) into the spinal cord after contusion injury promotes a functional outcome. Spinal cord injury (SCI) was induced using an NYU impactor and hMSCs were transplanted 1 week after SCI. Behavioral testing was performed weekly for 2 months. Somatosensory (SSEPs) and motor evoked potentials (MEPs) were recorded to determine functional recovery. Hindlimb performance was modestly improved in the transplanted group based on BBB scaling and pain tests. SSEP latencies in the transplanted group were significantly shorter than in the media-treated group. Pathologically, LacZ and hTau positive cells were located at the injury and adjacent sites. The data indicate improvement in functional outcome in animals treated with hMSC transplantation compared to media-treated animals.
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