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Slow oscillation circuit of the intergeniculate leaflet

100%
Lewandowski M. H., Blasiak T.
Acta Neurobiologiae Experimentalis
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2004
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vol. 64
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issue 2
277-288
EN
The slow oscillation circuit of the intergeniculate leaflet seems to constitute a natural basic rhythm of the neuronal mechanism of mammalian biological clock. The results of studies conducted so far indicate that photic information flowing from ganglion cells of the retina is necessary for its generation. On the other hand, this circuit is maintained thanks to the oscillatory activity of GABAergic interneurons, the majority of which build up this structure, mainly in combination with neuropeptide Y and enkephalins. The activity of non-specific projections of the brain, whose terminals are present in the intergeniculate leaflet, modulates the slow oscillation circuit of the leaflet neurons, without changing its oscillatory pattern, though. Our hypothesis predicts a role of the oscillatory activity of intergeniculate leaflet neurons in facilitation the secretion of neuropeptides and neurohormones present in the very elements making up the mechanism of mammalian biological clock and structures linked to it. This constitutes a kind of functional junction between the central mechanism of mammalian biological clock with an ultradian rhythm and its peripheral clocks whose rhythm is circadian.
2

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

75%
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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