Common Forms of Synaptic Plasticity in the Hippocampus and Neocortex in Vitro
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To observe the effect of acupuncture on p130 expression in neocortex and hippocampus of Senescence Accelerated Mouse/Prone (SAMP) 10 so as to explore its underlying molecular mechanism in treating dementia and aging-related diseases.Thirty SAMP 10 were randomly divided into model, acupuncture, and non-acupoint groups with 10 cases in each, and 10 SAM/Resistant (SAMR)1 were used as normal control group. The needle manipulation of "Yi Qi Tiao Xue, Fu Ben Pei Yuan" (Reinforcing qi and blood, and strengthening the body resistance) was applied to "Shanzhong" (CV 17), "Zhongwan" (CV 12), "Qihai" (CV 16), "Xuehai" (SP 10) and "Zusanli" (ST 36), once daily for two weeks. p130 expression of neocortex and hippocampus was assayed by western blotting technique.In SAMR 1 control group, p 130 expression in the neocortex and hippocampus exhibited an age-related stable upregulation from month 2 to 12, being significantly from the 6= month (neocortex) on and 8th month (hippocampus) on respectively (P < 0.05, 0.01). In SAMP 10 group, hippocampal and neocortical p130 expression exhibited an age-related downregulation change in the same period, fluctuating in about 6th month (downregulated remarkably in hippocampus, P < 0.01; upregulated markedly in neocortex, P < 0.01). In comparison with SAMR 1 (8 months old) group, p130 expression in hippocampus in SAMP 10 model group was upregulated significantly (P < 0.05); while that in neocortex downregulated considerably (P < 0.05). The expression of p 130 in neocortex in acupoint-acupuncture group was significantly higher than that in SAMP 10 model and non-acupoint acupuncture groups (P < 0.05). No significant differences were found between acupoint- and non-acupoint acupuncture groups in hippocampal p 130 expression, and between non-acupoint acupuncture and SAMP 10 model groups in neocortical p 130 expression (P > 0.05).Along with the increase of aging, p 130 expression in both hippocampus and neocortex increases gradually in SAMR 1, while decreases in SAMP 10, in spite of fluctuating at month 6 in age. Acupuncture can beneficially regulate the aberrant expression of p130 in neocortex of 8-month-old SAMP 10.
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Chronic (repeated skin incisions) as well as acute stress (left adrenalectomy) was applied to rats whose hippocampus had been damaged through the neocortex (hippocampus-damaged), to rats in which only the portion of the neocortex over the hippocampus had been damaged (neocortex-damaged), and to control rats. Both in the acute and chronic stress series, the left adrenal ascorbic acid content before stress was compared with that of the right adrenal gland following stress, and the difference served as a measure of reaction to the stress. Under acute stress, 72 rats showed a decrease in adrenal ascorbic acid content more pronounced in hippocampus-damaged rats and control animals than in the neocortex-damaged animals. Under chronic stress, increase in adrenal ascorbic acid content in 68 rats was least pronounced in hippocampus-damaged rats, most marked in neocortex-damaged animals, while the value was intermediate in control rats. The inference from these data is that the hippocampus exerts a sustained inhibitory influence upon the pituitary-adrenocortical mechanism.
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Interneuron
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Neuronal migration disorders have been involved in various pathologies, including epilepsy, but the properties of the neural networks underlying disorders have not been determined. In the present study, patch clamp recordings were made from intrahippocampal heterotopic as well as from neocortical and hippocampal neurons from brain slices of rats with prenatally methylazoxymethanol-induced cortical malformation. We report that heterotopic neurons have morphometrical parameters and cellular properties of neocortical supragranular neurons and are integrated in both neocortical and hippocampal networks. Thus, stimulation of the white matter induces both antidromic and orthodromic response in heterotopic and neocortical neurons. Stimulation of hippocampal afferents evokes a monosynaptic response in the majority of heterotopic neurons and a polysynaptic all-or-none epileptiform burst in the presence of bicuculline to block γ-aminobutyric acid type A inhibition. Furthermore, hippocampal paroxysmal activity generated by bath application of bicuculline can spread directly to the neocortex via the heterotopia in methylazoxymethanol-treated but not in naive rats. We conclude that heterotopias form a functional bridge between the limbic system and the neocortex, providing a substrate for pathological conditions.
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Activity in neocortex is often characterized by synchronized oscillations of neurons and networks, resulting in the generation of a local field potential (LFP) and electroencephalogram. Do the neuronal networks of the cerebellum also generate synchronized oscillations and are they under the influence of those in the neocortex? Here we show that, in the absence of any overt external stimulus, the cerebellar cortex generates a slow oscillation that is correlated with that of the neocortex. Disruption of the neocortical slow oscillation abolishes the cerebellar slow oscillation, whereas blocking cerebellar activity has no overt effect on the neocortex. We provide evidence that the cerebellar slow oscillation results in part from the activation of granule, Golgi, and Purkinje neurons. In particular, we show that granule and Golgi cells discharge trains of single spikes, and Purkinje cells generate complex spikes, during the "up" state of the slow oscillation. Purkinje cell simple spiking is weakly related to the cerebellar and neocortical slow oscillation in a minority of cells. Our results indicate that the cerebellum generates rhythmic network activity that can be recorded as an LFP in the anesthetized animal, which is driven by synchronized oscillations of the neocortex. Furthermore, we show that correlations between neocortical and cerebellar LFPs persist in the awake animal, indicating that neocortical circuits modulate cerebellar neurons in a similar manner in natural behavioral states. Thus, the projection neurons of the neocortex collectively exert a driving and modulatory influence on cerebellar network activity.
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Deep cerebellar nuclei
Stimulus (psychology)
Premovement neuronal activity
Oscillation (cell signaling)
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Cortical Spreading Depression
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Abstract The cerebrocerebellar circuit is a feedback circuit that bidirectionally connects the neocortex and the cerebellum. According to the classic view, the cerebrocerebellar circuit is specifically involved in the functional regulation of the motor areas of the neocortex. In recent years, studies carried out in experimental animals by morphological and physiological methods, and in humans by magnetic resonance imaging, have indicated that the cerebrocerebellar circuit is also involved in the functional regulation of the nonmotor areas of the neocortex, including the prefrontal, associative, sensory and limbic areas. Moreover, a second type of cerebrocerebellar circuit, bidirectionally connecting the hypothalamus and the cerebellum, has been detected, being specifically involved in the regulation of the hypothalamic functions. This review analyzes the morphological features of the centers and pathways of the cerebrocerebellar circuits, paying particular attention to their organization in different channels, which separately connect the cerebellum with the motor areas and nonmotor areas of the neocortex, and with the hypothalamus. Actually, a considerable amount of new data have led, and are leading, to profound changes on the views on the anatomy, physiology, and pathophysiology of the cerebrocerebellar circuits, so much they may be now considered to be essential for the functional regulation of many neocortex areas, perhaps all, as well as of the hypothalamus and of the limbic system. Accordingly, clinical studies have pointed out an involvement of the cerebrocerebellar circuits in the pathophysiology of an increasing number of neuropsychiatric disorders.
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Biological neural network
Neuronal Circuits
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Almost all areas of the neocortex are connected with the claustrum, a nucleus located between the neocortex and the striatum, yet the functions of corticoclaustral and claustrocortical connections remain largely obscure. As major efforts to model the neocortex are currently underway, it has become increasingly important to incorporate the corticoclaustral system into theories of cortical function. This Mini-Symposium was motivated by a series of recent studies which have sparked new hypotheses regarding the function of claustral circuits. Anatomical, ultrastructural, and functional studies indicate that the claustrum is most highly interconnected with prefrontal cortex, suggesting important roles in higher cognitive processing, and that the organization of the corticoclaustral system is distinct from the driver/modulator framework often used to describe the corticothalamic system. Recent findings supporting roles in detecting novel sensory stimuli, directing attention and setting behavioral states, were the subject of the Mini-Symposium at the 2017 Society for Neuroscience Annual Meeting.
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Inhibitory GABA (γ-aminobutyric acid)-ergic interneurons are a vital component of the neocortex responsible for shaping its output through a variety of inhibitions. Consisting of many flavors, interneuron subtypes are predominantly defined by their morphological, physiological, and neurochemical properties that help to determine their functional role within the neocortex. During development, these cells are born in the subpallium where they then tangentially migrate over long distances before being radially positioned to their final location in the cortical laminae. As development progresses into adolescence, these cells mature and form chemical and electrical connections with both glutamatergic excitatory neurons and other interneurons ultimately establishing the cortical network. The production, migration, and organization of these cells are determined by vast array of extrinsic and intrinsic factors that work in concert in order to assemble a proper functioning cortical inhibitory network. Failure of these cells to undergo these processes results in abnormal positioning and cortical function. In humans, this can bring about several neurological disorders including schizophrenia, epilepsy and autism spectrum disorders. In this article, we will review previous literature that has revealed the framework for interneuron neurogenesis and migratory behavior as well as discuss recent findings that aim to elucidate the spatial and functional organization of interneurons within the neocortex.
Neocortex
Interneuron
Neurochemical
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