scholarly journals Comparison studies of neurotropic activity of the nepeta cataria and nepeta grandiflora extracts

Author(s):  
И.А. Лупанова ◽  
Е.Н. Курманова ◽  
Е.В. Ферубко ◽  
И.А. Мартынчик ◽  
В.К. Колхир ◽  
...  

Перспективными источниками биологически активных веществ (БАВ), обладающих нейротропной активностью, являются представители рода Nepeta L. - котовник кошачий (Nepeta cataria L.) и котовник крупноцветковый (Nepeta grandiflora Bieb.). Цель - изучение в эксперименте in vivo и in vitro фармакологической активности экстрактов и фракций БАВ котовника кошачьего и котовника крупноцветкового. Методика. Для сравнительной оценки нейротропной активности экстрактов котовников кошачьего (Nepeta cataria L.) и крупноцветкового (Nepeta grandiflora Bieb.) проведен биологический скрининг образцов, обладающих дофаминергической активностью с применением тирозингидроксилазной специфической ферментной биотест-системы в условиях in vitro. Определение параметров острой токсичности и противовоспалительной активности экстракта проводили в экспериментах in vivo. Для оценки острой токсичности экстракта по методу Кербера использованы белые нелинейные мыши-самцы. Экстракты вводили животным внутрижелудочно в дозах 500, 1000, 1500 и 2000 мг/кг. Изучали влияние курсового (3-4 сут) введения выбранных по результатам скрининга экстрактов (дозы 10 и 100 мг/кг) на центральную нервную систему и поведение животных на моделях «приподнятый крестообразный лабиринт» и «хлоралгидратный сон». Препаратом сравнения служил экстракт пустырника (100 мг/кг). Результаты. В результате проведенных скрининговых исследований в условиях опытов in vitro с применением специфической ферментной биотест-системы на основе тирозингидроксилазы выявлена дофаминергическая активность у котовника крупноцветкового экстракта сухого и котовника кошачьего экстракта сухого. При однократном введении экстракты не приводили к гибели животных, изменению внешнего вида и поведенческих реакций мышей. В соответствии с классификацией токсичности химических веществ по ГОСТ 12.1.007-76 экстракты является малотоксичными веществами. В дозах 10 и 100 мг/кг экстракты оказывали статистически значимое седативное действие, снижали нервно-эмоциональное напряжение. Седативное действие проявлялось в ускорении процесса засыпания и увеличении продолжительности сна. Заключение. Выявлена дофаминергическая активность экстрактов котовника крупноцветкового экстракта сухого и котовника кошачьего экстракта сухого. Экстракты котовника кошачьего и котовника крупноцветкового являются малотоксичными веществами, обладают в опытах in vivo выраженным седативным действием, снижают нервно-эмоциональное напряжение. Экстракты котовника кошачьего и котовника крупноцветкового перспективны для дальнейшего изучения. Promising sources of biologically active substances (BAS) with neurotropic activity are representatives of the genus Nepeta L. - cat’s cat (Nepeta cataria L.) and large-flowered cat’s cat (Nepeta grandiflora Bieb.). The aim of the work is to study the pharmacological activity of extracts and fractions of BAS Catnip and large-flowered Catnip with the use of specific enzyme Biotest systems in in vitro experiments and using biological models on laboratory animals. Method. For a comparative assessment of the neurotropic activity of cat extracts (Nepeta cataria L.) and large-flowered (Nepeta grandiflora Bieb.) biological screening of samples with dopaminergic activity was performed using a tyrosine hydroxylase-specific enzyme Biotest system in in vitro experiments. The parameters of acute toxicity and anti-inflammatory activity of the extract were determined. When studying the acute toxicity of the extract using the Kerber method, white non-linear male mice in the number of 30 individuals were used. Extracts were administered to animals intragastrically in doses of 500, 1000, 1500 and 2000 mg/kg. We studied the effect of course (3-4 days) administration of selected extracts based on the results of screening on the Central nervous system and animal behavior at doses of 10 and 100 mg / kg on the models «raised cruciform labyrinth» and «chloral hydrate sleep». Comparison drug-motherwort extract tablets at a dose of 100 mg/kg. Results. As a result of screening studies in in vitro experiments based on tyrosine hydroxylase, dopaminergic activity was detected in the cat’s large-flowered dry extract and cat’s dry cat extract. When administered once, the extracts did not lead to the death of animals, changes in the appearance and behavioral reactions of mice were not observed. According to the chemical toxicity classification according to GOST 12.1.007-76, extracts are low-toxic substances. In doses of 10 mg / kg and 100 mg / kg, these extracts have a significantly pronounced sedative effect, reduce nervous and emotional tension. The sedative effect is shown in improving sleep and increasing the duration of sleep. Conclusions. Dopaminergic activity was detected in the cat’s large-flowered dry extract and the cat’s dry cat extract. Extracts of Catnip and large-flowered Catnip are low-toxic substances, have a pronounced sedative effect in experiments in vivo, reduce nervous and emotional tension. Extracts of Catnip and large-flowered Catnip are promising for further study.

2021 ◽  
Vol 09 (06) ◽  
pp. E918-E924
Author(s):  
Tomonori Yano ◽  
Atsushi Ohata ◽  
Yuji Hiraki ◽  
Makoto Tanaka ◽  
Satoshi Shinozaki ◽  
...  

Abstract Backgrounds and study aims Gel immersion endoscopy is a novel technique to secure the visual field during endoscopy. The aim of this study was to develop a dedicated gel for this technique. Methods To identify appropriate viscoelasticity and electrical conductivity, various gels were examined. Based on these results, the dedicated gel “OPF-203” was developed. Efficacy and safety of OPF-203 were evaluated in a porcine model. Results  In vitro experiments showed that a viscosity of 230 to 1900 mPa·s, loss tangent (tanδ) ≤ 0.6, and hardness of 240 to 540 N/cm2 were suitable. Ex vivo experiments showed electrical conductivity ≤ 220 μS/cm is appropriate. In vivo experiments using gastrointestinal bleeding showed that OPF-203 provided clear visualization compared to water. After electrocoagulation of gastric mucosa in OPF-203, severe coagulative necrosis was not observed in the muscularis but limited to the mucosa. Conclusions OPF-203 is useful for gel immersion endoscopy.


2021 ◽  
Vol 11 (3) ◽  
pp. 1165
Author(s):  
Wen-Tien Hsiao ◽  
Yi-Hong Chou ◽  
Jhong-Wei Tu ◽  
Ai-Yih Wang ◽  
Lu-Han Lai

The purpose of this study is to establish the minimal injection doses of magnetic resonance imaging (MRI) contrast agents that can achieve optimized images while improving the safety of injectable MRI drugs. Gadolinium-diethylenetriamine penta-acetic acid (Gd-DTPA) and ferucarbotran, commonly used in clinical practice, were selected and evaluated with in vitro and in vivo experiments. MRI was acquired using T1-weighted (T1W) and T2-weighted (T2W) sequences, and the results were quantitatively analyzed. For in vitro experiments, results showed that T1W and T2W images were optimal when Gd-DTPA-bisamide (2-oxoethyl) (Gd-DTPA-BMEA) and ferucarbotran were diluted to a volume percentage of 0.6% and 0.05%; all comparisons were significant differences in grayscale statistics using one-way analysis of variance (ANOVA). For in vivo experiments, the contrast agent with optimal concentration percentages determined from in vitro experiments were injected into mice with an injection volume of 100 μL, and the images of brain, heart, liver, and mesentery before and after injection were compared. The statistical results showed that the p values of both T1W and T2W were less than 0.001, which were statistically significant. Under safety considerations for MRI contrast agent injection, optimized MRI images could still be obtained after reducing the injection concentration, which can provide a reference for the safety concentrations of MRI contrast agent injection in the future.


2013 ◽  
Vol 14 (2) ◽  
pp. 215-224 ◽  
Author(s):  
Eun-Young Kim ◽  
Sang Soo Lee ◽  
Ji Hoon Shin ◽  
Soo Hyun Kim ◽  
Dong-Ho Shin ◽  
...  

Development ◽  
1973 ◽  
Vol 29 (1) ◽  
pp. 159-174
Author(s):  
Nelly Bennett

The detection of a specific enzyme (cysteine lyase) of the yolk-sac endoderm by a very sensitive method is employed to characterize cell differentiation during the early stages of endoderm organogenesis in the chick. The first cells to contain active cysteine lyase are found in the germ wall at the primitive streak stage. In vivo observations establish a relation between the morphological specialization and organization of endodermal cells, their loss of mitotic activity and the increase in cysteine lyase activity. They suggest an influence of the mesoderm on endoderm differentiation. In vitro experiments confirm the existence in the yolk-sac endoderm of an incompatibility between cell proliferation and differentiation, as well as the action of the mesoderm on both the structural organization of the endoblast and the appearance of cysteine lyase; this last action seems to be due mainly to blood cells; chicken and rabbit blood cells are equally active. The problems of the origin of the endoderm and of the interactions occurring during the organogenesis of the yolk-sac endoderm are discussed.


1937 ◽  
Vol 37 (3) ◽  
pp. 471-473 ◽  
Author(s):  
J. Gordon ◽  
N. Wood

In earlier papers (Gordon, 1930) it was shown that congo red has an inactivating effect on serum complement, both haemolytic and bactericidal, and that this effect can be reversed by treating the serum and congo red mixture with charcoal, the charcoal removing the congo red and leaving the complement active again. A similar reversal of inactivation is obtained by using instead of the charcoal, heated serum (55° C. for 30 min.) or protein solutions. Later (Gordon, 1931), it was shown that congo red had an inactivating effect on the haemolysins of Streptococcus haemolyticus and B. welchii. The reversibility of this effect was not so easy to demonstrate as with complement. Charcoal had a destructive effect on the haemolysins and so could not be used. It was found, however, that when the concentration of congo red was just sufficient to neutralize the streptococcal haemolysin, the addition of cuprammonium artificial silk adsorbed the congo red and liberated the haemolysin. In the case of B. welchii this method of reversal was not suitable, as the artificial silk had a destructive effect on the haemolysin. Instead, reversibility was demonstrated by adding ox serum to the mixture of congo red and haemolysin. This brought about a redistribution of the congo red between the ox serum and the haemolysin and if the amount of congo red used had been only just sufficient to neutralize the haemolysin of B. welchii, then the haemolytic activity could again be demonstrated. Gordon and Robson (1933) showed that congo red interfered with the anaphylactic reaction tested both in vivo and in vitro, the guinea-pig uterus being used in the in vitro experiments, in which the inhibitory action of the dye was shown to be reversible. It was suggested that the congo red interfered with the entrance of antigen into the cell.


1993 ◽  
Vol 120 (2) ◽  
pp. 523-535 ◽  
Author(s):  
B E Symington ◽  
Y Takada ◽  
W G Carter

The colocalization of integrins alpha 2 beta 1 and alpha 3 beta 1 at intercellular contact sites of keratinocytes in culture and in epidermis suggests that these integrins may mediate intercellular adhesion (ICA). P1B5, an anti-alpha 3 beta 1 mAb previously reported to inhibit keratinocyte adhesion to epiligrin, was also found to induce ICA. Evidence that P1B5-induced ICA was mediated by alpha 2 beta 1 and alpha 3 beta 1 was obtained using both ICA assays and assays with purified, mAb-immobilized integrins. Selective binding of alpha 2 beta 1-coated beads to epidermal cells or plate-bound alpha 3 beta 1 was observed. This binding was inhibited by mAbs to integrin alpha 3, alpha 2, or beta 1 subunits and could be stimulated by P1B5. We also demonstrate a selective and inhibitable interaction between affinity-purified integrins alpha 2 beta 1 and alpha 3 beta 1. Finally, we show that expression of alpha 2 beta 1 by CHO fibroblasts results in the acquisition of collagen and alpha 3 beta 1 binding. Binding to both of these ligands is inhibited by P1H5, an anti-alpha 2 beta 1 specific mAb. Results of these in vitro experiments suggest that integrins alpha 2 beta 1 and alpha 3 beta 1 can interact and may do so to mediate ICA in vivo. Thus, alpha 3 beta 1 mediates keratinocyte adhesion to epiligrin and plays a second role in ICA via alpha 2 beta 1.


2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Fawang Zhu ◽  
Shuai Yuan ◽  
Jing Li ◽  
Yun Mou ◽  
Zhiqiang Hu ◽  
...  

Background. Cilengitide is a selective αvβ3 and αvβ5 integrin inhibitor. We sought to investigate the effect of cilengitide on the neovascularization of abdominal aortic plaques in rabbits and explore its underlying antiangiogenic mechanism on human umbilical vein endothelial cells (HUVECs). Materials and Methods. For the in vivo experiment, the abdominal aortic plaque model of rabbits was established and injected with different doses of cilengitide or saline for 14 consecutive days. Conventional ultrasound (CUS) and contrast-enhanced ultrasound (CEUS) were applied to measure the vascular structure and blood flow parameters. CD31 immunofluorescence staining was performed for examining neovascularization. Relative expressions of vascular endothelial growth factor (VEGF) and integrin of the plaque were determined. For in vitro experiments, HUVECs were tested for proliferation, migration, apoptosis, and tube formation in the presence of different doses of cilengitide. Relative expressions of VEGF, integrin, and Ras/ERK/AKT signaling pathways were determined for the exploration of underlying mechanism. Results. CEUS showed modestly increased size and eccentricity index (EI) of plaques in the control group. Different degrees of reduced size and EI of plaques were observed in two cilengitide treatment groups. The expressions of VEGF and integrin in the plaque were inhibited after 14 days of cilengitide treatment. The neovascularization and apoptosis of the abdominal aorta were also significantly alleviated by cilengitide treatment. For in vitro experiments, cilengitide treatment was found to inhibit the proliferation, migration, and tube formation of HUVECs. However, cilengitide did not induce the apoptosis of HUVECs. A higher dose of cilengitide inhibited the mRNA expression of VEGF-A, β3, and β5, but not αV. Lastly, cilengitide treatment significantly inhibited the Ras/ERK/AKT pathway in the HUVECs. Conclusions. This study showed that cilengitide effectively inhibited the growth of plaque size by inhibiting the angiogenesis of the abdominal aortic plaques and blocking the VEGF-mediated angiogenic effect on HUVECs.


1970 ◽  
Vol 17 ◽  
pp. 69-70
Author(s):  
Austin E. Lamberts

While investigating a reef coral kill in Samoa it was speculated that this might have been due to contamination by some chemical. Subsequently, scleractinian reef corals were tested to assess their reactions to 12 commonly used pesticides and toxic substances. The chlorinated-hydrocarbons such as DDT and Endrin produced stress effects in corals subjected to 2ppm for 24 hours in in-vitro studies although the corals continued to deposit skeletal calcium. In-vivo tank experiments suggested that small amounts of these substances in seawater stimulated the corals to deposit skeletal calcium. Other pesticides were much less toxic to the corals.


Aging ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 1226-1239 ◽  
Author(s):  
Zeyu Li ◽  
Yifan Jia ◽  
Yang Feng ◽  
Ruixia Cui ◽  
Runchen Miao ◽  
...  
Keyword(s):  

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