scholarly journals Modulation of Synaptic Plasticity by Vibratory Training in Young and Old Mice

2021 ◽  
Vol 11 (1) ◽  
pp. 82
Author(s):  
Ida Cariati ◽  
Roberto Bonanni ◽  
Gabriele Pallone ◽  
Giuseppe Annino ◽  
Virginia Tancredi ◽  
...  

In the past 40 years, scientific research has shown how Whole Body Vibration concept represents a strong stimulus for the whole organism. Low (<30 Hz), medium (30–80 Hz), and high (>80 Hz) frequency vibrations can have both positive and negative effects, depending on the oscillation type and duration of exposure to which the body is subjected. However, very little is known about the effects of vibratory training on the brain. In this regard, we verified whether three vibratory training protocols, differing in terms of vibration frequency and exposure time to vibration, could modulate synaptic plasticity in an experimental mouse model, by extracellular recordings in vitro in hippocampal slices of mice of 4 and 24 months old. Our results showed that vibratory training can modulate synaptic plasticity differently, depending on the protocol used, and that the best effects are related to the training protocol characterized by a low vibration frequency and a longer recovery time. Future studies will aim to understand the brain responses to various types of vibratory training and to explore the underlying mechanisms, also evaluating the presence of any structural and functional changes due to vibratory training.

2019 ◽  
Vol 20 (11) ◽  
pp. 2765 ◽  
Author(s):  
Jihwan Myung ◽  
Mei-Yi Wu ◽  
Chun-Ya Lee ◽  
Amalia Ridla Rahim ◽  
Vuong Hung Truong ◽  
...  

The kidney harbors one of the strongest circadian clocks in the body. Kidney failure has long been known to cause circadian sleep disturbances. Using an adenine-induced model of chronic kidney disease (CKD) in mice, we probe the possibility that such sleep disturbances originate from aberrant circadian rhythms in kidney. Under the CKD condition, mice developed unstable behavioral circadian rhythms. When observed in isolation in vitro, the pacing of the master clock, the suprachiasmatic nucleus (SCN), remained uncompromised, while the kidney clock became a less robust circadian oscillator with a longer period. We find this analogous to the silencing of a strong slave clock in the brain, the choroid plexus, which alters the pacing of the SCN. We propose that the kidney also contributes to overall circadian timekeeping at the whole-body level, through bottom-up feedback in the hierarchical structure of the mammalian circadian clocks.


2021 ◽  
Vol 6 (4) ◽  
pp. 101
Author(s):  
Ida Cariati ◽  
Roberto Bonanni ◽  
Gabriele Pallone ◽  
Manuel Scimeca ◽  
Claudio Frank ◽  
...  

Aerobic training is known to influence cognitive processes, such as memory and learning, both in animal models and in humans. Particularly, in vitro and in vivo studies have shown that aerobic exercise can increase neurogenesis in the dentate gyrus, improve hippocampal long-term potentiation (LTP), and reduce age-related decline in mnemonic function. However, the underlying mechanisms are not yet fully understood. Based on this evidence, the aim of our study was to verify whether the application of two aerobic training protocols, different in terms of speed and speed variation, could modulate synaptic plasticity in a young murine model. Therefore, we assessed the presence of any functional changes by extracellular recordings in vitro in mouse hippocampal slices and structural alterations by transmission electron microscopy (TEM). Our results showed that an aerobic training protocol, well designed in terms of speed and speed variation, significantly contributes to improving synaptic plasticity and hippocampal ultrastructure, optimizing its benefits in the brain. Future studies will aim to clarify the underlying biological mechanisms involved in the modulation of synaptic plasticity induced by aerobic training.


2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Bo Wang ◽  
Yanli Du

Cadmium (Cd) is a heavy metal that has received considerable concern environmentally and occupationally. Cd has a long biological half-life mainly due to its low rate of excretion from the body. Thus, prolonged exposure to Cd will cause toxic effect due to its accumulation over time in a variety of tissues, including kidneys, liver, central nervous system (CNS), and peripheral neuronal systems. Cd can be uptaken from the nasal mucosa or olfactory pathways into the peripheral and central neurons; for the latter, Cd can increase the blood brain barrier (BBB) permeability. However, mechanisms underlying Cd neurotoxicity remain not completely understood. Effect of Cd neurotransmitter, oxidative damage, interaction with other metals such as cobalt and zinc, estrogen-like, effect and epigenetic modification may all be the underlying mechanisms. Here, we review thein vitroandin vivoevidence of neurotoxic effects of Cd. The available finding indicates the neurotoxic effects of Cd that was associated with both biochemical changes of the cell and functional changes of central nervous system, suggesting that neurotoxic effects may play a role in the systemic toxic effects of the exposure to Cd, particularly the long-term exposure.


1976 ◽  
Vol 15 (05) ◽  
pp. 248-253
Author(s):  
A. K. Basu ◽  
S. K. Guha ◽  
B. N. Tandon ◽  
M. M. Gupta ◽  
M. ML. Rehani

SummaryThe conventional radioisotope scanner has been used as a whole body counter. The background index of the system is 10.9 counts per minute per ml of sodium iodide crystal. The sensitivity and derived sensitivity parameters have been evaluated and found to be suitable for clinical studies. The optimum parameters for a single detector at two positions above the lying subject have been obtained. It has been found that for the case of 131I measurement it is possible to assay a source located at any point in the body with coefficient of variation less than 5%. To add to the versatility, a fixed geometry for in-vitro counting of large samples has been obtained. The retention values obtained by the whole body counter have been found to correlate with those obtained by in-vitro assay of urine and stool after intravenous administration of 51Cr-albumin.


1924 ◽  
Vol 39 (4) ◽  
pp. 533-542 ◽  
Author(s):  
James E. McCartney

These studies fail to confirm the statements previously made that microorganisms of the class of the globoid bodies of poliomyelitis may be cultivated in the Smith-Noguchi medium from the so called virus of encephalitis lethargica. They show equally that the herpes virus does not multiply in this medium. The experiments indicate, moreover, that the medium is unfavorable to the survival of the virus, while ordinary broth under aerobic conditions is more favorable for maintaining the activity of both the encephalitic and the herpes viruses. Probably no multiplication of either takes place in the latter medium but merely a survival, and for a maximum period of 6 days in the broth itself, and 12 days in the fragment of brain tissue immersed in the broth. Finally, it has been shown that with a suitable technique the viruses can be passed from the brain of one rabbit to that of another through a long series without contamination with cocci or other common bacterial forms. Hence we regard all reports of the finding of ordinary bacteria in the brain of cases of epidemic or lethargic encephalitis as instances of mixed or secondary infection arising during life, or examples of postmortem invasion of the body, or of faulty technique at the autopsy.


2012 ◽  
Vol 2 (6) ◽  
pp. 241-254 ◽  
Author(s):  
Zerrin Atakan

Cannabis is a complex plant, with major compounds such as delta-9-tetrahydrocannabinol and cannabidiol, which have opposing effects. The discovery of its compounds has led to the further discovery of an important neurotransmitter system called the endocannabinoid system. This system is widely distributed in the brain and in the body, and is considered to be responsible for numerous significant functions. There has been a recent and consistent worldwide increase in cannabis potency, with increasing associated health concerns. A number of epidemiological research projects have shown links between dose-related cannabis use and an increased risk of development of an enduring psychotic illness. However, it is also known that not everyone who uses cannabis is affected adversely in the same way. What makes someone more susceptible to its negative effects is not yet known, however there are some emerging vulnerability factors, ranging from certain genes to personality characteristics. In this article we first provide an overview of the biochemical basis of cannabis research by examining the different effects of the two main compounds of the plant and the endocannabinoid system, and then go on to review available information on the possible factors explaining variation of its effects upon different individuals.


2017 ◽  
Vol 118 (4) ◽  
pp. 2499-2506 ◽  
Author(s):  
A. Pomante ◽  
L. P. J. Selen ◽  
W. P. Medendorp

The vestibular system provides information for spatial orientation. However, this information is ambiguous: because the otoliths sense the gravitoinertial force, they cannot distinguish gravitational and inertial components. As a consequence, prolonged linear acceleration of the head can be interpreted as tilt, referred to as the somatogravic effect. Previous modeling work suggests that the brain disambiguates the otolith signal according to the rules of Bayesian inference, combining noisy canal cues with the a priori assumption that prolonged linear accelerations are unlikely. Within this modeling framework the noise of the vestibular signals affects the dynamic characteristics of the tilt percept during linear whole-body motion. To test this prediction, we devised a novel paradigm to psychometrically characterize the dynamic visual vertical—as a proxy for the tilt percept—during passive sinusoidal linear motion along the interaural axis (0.33 Hz motion frequency, 1.75 m/s2peak acceleration, 80 cm displacement). While subjects ( n=10) kept fixation on a central body-fixed light, a line was briefly flashed (5 ms) at different phases of the motion, the orientation of which had to be judged relative to gravity. Consistent with the model’s prediction, subjects showed a phase-dependent modulation of the dynamic visual vertical, with a subject-specific phase shift with respect to the imposed acceleration signal. The magnitude of this modulation was smaller than predicted, suggesting a contribution of nonvestibular signals to the dynamic visual vertical. Despite their dampening effect, our findings may point to a link between the noise components in the vestibular system and the characteristics of dynamic visual vertical.NEW & NOTEWORTHY A fundamental question in neuroscience is how the brain processes vestibular signals to infer the orientation of the body and objects in space. We show that, under sinusoidal linear motion, systematic error patterns appear in the disambiguation of linear acceleration and spatial orientation. We discuss the dynamics of these illusory percepts in terms of a dynamic Bayesian model that combines uncertainty in the vestibular signals with priors based on the natural statistics of head motion.


2016 ◽  
Vol 16 (1) ◽  
pp. 9
Author(s):  
Ummu Balqis ◽  
Darmawi Darmawi ◽  
Maryam Maryam ◽  
Muslina Muslina ◽  
Abdullah Hamzah ◽  
...  

ABSTRAK. Tujuan penelitian ini untuk mengetahui motilitas Ascaridia galli dewasa dalam ekstrak etanol biji Veitchia merrillii. Ekstrak etanol V. merrillii dianalisis fitokimia. Sebanyak 16 ekor cacing A. galli dewasa dibagi kedalam empat kelompok. Cacing pada kelompok pertama adalah kelompok tanpa perlakuan. Cacing pada kelompok kedua diberi 0,6 mg/ml levamisole. Cacing pada masing-masing kelompok ketiga dan keempat diberi 50 dan 100 mg/ml crude ekstrak biji V. merrillii. Motilitas A. galli ditentukan dalam skor persentase setelah 12, 24, 36 jam dengan menggunakan kriteria: 3 (badan bergerak), 2 (hanya sebagian badan bergerak), 1 (tidak bergerak tetapi masih hidup), 0 (mati). Hasil fitokimia V. merrillii mengandung alkaloids, saponins, tannins, flavonoids, terpenoids. Ekstrak biji V. merrillii dosis 100 mg/ml secara in vitro dapat mempersingkat selama 12 jam waktu motilitas cacing A. galli dewasa. Penelitian ini mengindikasikan potensi anthelmintik berbasis herbal untuk pengendalian A. galli.  (Motility of Ascaridia galli adult worms in vitro in ethanolic extracts of Nuts Veitchia merrillii) ABSTRACT. The purpose of this research was to know the motility of Ascaridia galli adult worms in aqueous ethanolic extracts of nuts Veitchia merrillii. The ethanolic extract of the V. merrillii was analyzed. Amount of sixteen head A. galli adult worms were divided into four groups. The first group, worms were left as un-treated normal controls. The second group, worms were treated with concentrations of 0,6 mg/ml levamisole. The third and fourth group, worms were treated with crude aqueous ethanolic extract of 50 and 100 mg/ml concentrations nuts of the V. merrillii, respectively. Motility of A. galli were determined after 12, 24, 36 hour by mean of persentage scored using the following criteria: 3 (moving whole body), 2 (moving only parts of the body), 1 (immobile but alive), and 0 (died). The result of phytochemical V. merrillii contains alkaloids, saponins, flavonoids, tannins, and terpenoids. V. merrillii nuts extract concentrations of 100 mg/ml in vitro can shorten the time motility A. galli adult worms for 12 hours. The study indicated the potential for developing herbal-based anthelmintics to control A. galli.


2020 ◽  
Vol 7 (1) ◽  
pp. 11-18
Author(s):  
Noni Zakiah ◽  
Vonna Aulianshah ◽  
T. Maulana Hidayatullah ◽  
Faridah Hanum

Kegunaan labu kuning di Indonesia masih sebatas daging buah yang dapat diolah menjadi panganan seperti kue basah, kolak dan sayur berkuah. Secara empiris, biji labu kuning telah digunakan untuk mengatasi cacingan. Penelitian ini dilakukan untuk mengetahui mortalitas cacing gelang (Ascaridia galli) dalam ekstrak etanol biji labu kuning (Cucurbita moschata Duchesne). Penelitian ini menggunakan 25 ekor Ascaridia galli yang dibagi menjadi 5 kelompok, kelompok I kontrol negatif menggunakan larutan NaCl fisiologis, kelompok II kontrol positif menggunakan larutan pirantel pamoat 0,5 %, kelompok III, IV dan V berturut-turut menggunakan 25 mg/ml, 50 mg/ml dan 100 mg/ml ekstrak etanol biji labu kuning. Parameter penelitian ini ditentukan dengan melihat persentase nilai skor pasca inkubasi 12 jam, 24 jam, dan 36 jam. Skor 3 diberikan apabila seluruh tubuh Ascaridia galli bergerak, skor 2 diberikan jika hanya sebagian tubuh Ascaridia galli bergerak, skor 1 jika Ascaridia galli diam tetapi masih hidup, dan skor 0 apabila Ascaridia galli mati. Hasil uji in vitro dengan perlakuan 25 mg/ml ekstrak etanol biji labu kuning menyebabkan kematian 3 ekor Ascaridia galli  atau 60% pasca inkubasi 36 jam, sedangkan ekstrak etanol biji labu kuning dengan perlakuan 50 mg/ml, 100 mg/ml dan kelompok kontrol positif mengakibatkan kematian 4 ekor Ascaridia galli atau 80% pasca inkubasi 36 jam. Dari hasil penelitian disimpulkan bahwa ekstrak etanol biji labu kuning (Cucurbita moschata Duchesne) dosis 25 mg/ml, 50 mg/ml, dan 100 mg/ml secara in vitro dalam waktu 36 jam mampu mengakibatkan mortalitas Ascaridia galli. The use of yellow pumpkin in Indonesia is still limited to fruit meat that can be processed into snacks such as soggy cakes, porridge and vegetable soup. This research was conducted to determine the mortality of Ascaridia galli in ethanol extract of yellow pumpkin seeds (Cucurbita moschata Duchesne). This study used 25 Ascaridia galli which were divided into 5 groups, group I was negative control using physiological NaCl solution, group II was positive control using 0.5% pirantel pamoate solution, group III, IV and V respectively used 25 mg / ml, 50 mg/ml and 100 mg/ml ethanol extract of yellow pumpkin seeds. The parameters of this study were determined by looking at the percentage of post-incubation scores 12 hours, 24 hours, and 36 hours. A score of 3 is given if the whole body of Ascaridia galli moves, a score of 2 is given if only part of the body of Ascaridia galli moves, a score of 1 if Ascaridia galli is still but still alive, and a score of 0 if Ascaridia galli dies. In vitro test results with 25 mg/ml ethanol extract of pumpkin seeds caused 3 deaths of Ascaridia galli or 60% after incubation for 36 hours, while ethanol extract of yellow pumpkin seeds treated with 50 mg / ml, 100 mg/ml and positive control group resulting in the death of 4 Ascaridia galli or 80% after 36 hours incubation. From the results of the study concluded that the ethanol extract of yellow pumpkin seeds (Cucurbita moschata Duchesne) doses of 25 mg / ml, 50 mg / ml, and 100 mg / ml in vitro within 36 hours can lead to Ascaridia galli mortality.


PEDIATRICS ◽  
1951 ◽  
Vol 7 (2) ◽  
pp. 269-293
Author(s):  
CHARLES C. CHAPPLE

A study has been made of the known phenomena which affect the biologic organism. Certain correlations have been found and other correlations are logically inferred. The common grounds of anatomic structures, the anatomic responses to endocrine stimuli, the interrelationships and interdependencies of the endocrines and external stimuli have been followed and have been related to cellular permeability and hyaluronic acid. Cellular phases, including the rhythmic alternations in physiologic functions, have been delineated and their importance stressed. Further, the probability is advanced that this rhythmicity originates physiologically in the brain but that the brain itself is capable of receiving transmissions from within and without the body, and disseminating them, again rhythmically, in normal or altered amplitude and frequency. Further experimental evidence of these correlations and their practical extrapolations into drug actions and the therapy of infections and metabolic disease will be reported and will include clinical, animal and in vitro studies. At present, the following conclusions seem justified: 1. No component of the body is capable of independent action. 2. Action in any component is reflected, according to its magnitude and directness of application, upon all the body. 3. All such actions are mediated by the brain. 4. There is a dynamic, rhythmic cyclicity in physiologic action which can be altered in amplitude and frequency. 5. These rhythms are alternations of cellular tenseness and relaxation. 6. The concomitants of the tense phase are compactness, impermeability, electric conductivity and contraction of all cells, and these characteristics might be described collectively as the factors operative in maturing the cell. The concomitants of the relaxed phase are laxness, permeability, electric resistance and expansion of all cells and are factors of growth. 7. The phase of tenseness is accompanied by an increase in certain hormonal activities and that of relaxation by an increase in others. 8. The hormones may be causes of the phase or the results of it. 9. Infectious disease cannot act as an extraneous agent capable of bringing its own engine into such a highly integrated mechanism but must act on the body through its ability to affect one of the body's mechanisms. 10. Drugs must act through the same channels available to disease. 11. Foods may contain, in addition to their caloric content, components capable of stimulating either the phase of cellular expansion or cellular compaction, particularly foods from the reproductive systems of plants or animals (milk, eggs, cereal, for example). 12. Vitamins each stimulate one phase and should be evaluated in terms of positive actions. 13. Inherent growth and maturation factors are not of fixed capacity in an individual but beyond certain limits must be supplied him or applied to him constantly. 14. The hormone most manifest in the tense phase is estrogen and so may be considered the maturation factor, and the one most manifest in the phase of relaxation or cell division is progesterone, which may be considered the growth factor.


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