• Biomedical Science Letters
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• v.16 no.4
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• pp.271-277
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• 2010

This study was conducted to investigate the biological activities of Areca catechu L. The antioxidative, fibrinolytic, thrombin inhibitory, and ${\alpha}$-glucosidase inhibitory activities of Areca catechu L extracted with hexane, $CHCl_3$, ethyl acetate, butanol, and water were measured. The water fraction showed the highest extraction yield at 3.65% (w/w). The butanol, $CHCl_3$, water, and ethyl acetate fractions showed strong antioxidative activities at 81.6%, 87.1%, 88.0%, and 89.5%, respectively. The fibrinolytic activity was strong only in the ethyl acetate fraction at 0.84 plasmin units/ml. The 100-fold dilution of the water fraction had the strongest thrombin inhibitory activity at 59.2%. The 100-fold dilution of butanol fraction displayed the strongest ${\alpha}$-glucosidase inhibitory activity at 88.6%. In conclusion, the extracts of Areca catechu L hold promise for use in the development of biofunctional foods to prevent cardiovascular diseases.

• Korean Journal of Veterinary Service
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• v.18 no.2
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• pp.182-188
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• 1995

Hemodynamic values were assessed in cows with naturally mastatis. hemodynamic tests included WBC, RBC, PCV, Hemoglobin, Monocyte, Eosinophil, Neutrophil, Lymphocyte, and prothrombin time, activated partial thromboplastin time, thrombin time, fibrinogen, platelet, antithrombin-III, and plasminogen activities. Significant changes were observed in the mean values of most analytses : WBC, monocytes, eosinophil, neutrophil were increased and Iymphocyte were decreased. prothrombin time was increased： activated partial thromboplastin time, thrombin time. increased : activated partial thromboplastin time, thrombin time, fibrinogen concentration, plasminogen activity and platelet concentration were decreased : and RBC, PCV, hemoglobin and antithrombin-III activity were unchanged, compared with normal mean values. Thesse data indicated activation of hemodynamic mechanisms, initiated either directly by bacteria produced endotoxin of secondaly inflammatory mediators produced in response to caused bacteria and naturally acquired mastitis was very similar to the experimental endotoxin-induced mastitis.

• Clinical and Experimental Pediatrics
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• v.57 no.4
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• pp.199-201
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• 2014

Iatrogenic pseudoaneurysms are extremely rare in children. Conventional management of pseudoaneurysms in adults has included surgical repair, ultrasound-guided compression, and more recently, endovascular embolization. However, in infants and children, there is little information regarding the applicability of such treatment modalities, which have been effective in adults, because of its rarity. Here, we present the case of a 6-month-old infant who developed a postprocedural pseudoaneurysm of the external iliac artery, which was successfully treated with ultrasound-guided percutaneous thrombin injection.

• Biomedical Science Letters
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• v.18 no.1
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• pp.35-41
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• 2012

Physiological activities of hot water extract and solvent fractions isolated from Astragalus membranaceus were examined and the antioxidative, fibrinolytic, thrombin inhibitory and a-glucosidase inhibitory activity were measured. The hot water extract of Astragalus membranaceus was fractionated into hexane, chloroform, ethyl acetate, butanol and water fractions, and each of these fractions was individually assayed. The antioxidative activities of ethyl acetate and chloroform fractions were 89.96% and 87.36%, respectively. Using the fibrin plate method, only the hot water extract showed a plasmin activity of 0.41 units/ml. The thrombin inhibitory activity of the ethyl acetate fraction was the highest with a value of 82.73%. The hot water extract displayed a-glucosidase inhibitory activity of 64.91%. In conclusion, the hot water extract and the ethyl acetate fraction can be used as materials for the development of biofunctional foods to prevent cardiovascular diseases.

• Journal of Life Science
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• v.18 no.3
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• pp.363-368
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• 2008

The in vitro thrombin inhibitory activities of 304 crude extracts from 76 kinds of korean wild insects were evaluated. Measurement of thrombin time showed that the DMSO extracts of Acrida cinerea cinerea (Thunberg), Anax parthenope julius Brauer, Eurydema rugosa Motschulsky, and Stethophyma magister (Rehn) and the water extracts of Dolycoris baccarum Linne, Lixus divaricatus Motschulsky, Metrioptera bonneti, Moechotypa diphysis (Pascoe), Nicrophorus concolor sp., and Tomapoderus ruficollis (Fabricius) had strong thrombin inhibitory activity. No prominent changes of activated partial thromboplastin time by treatment of the selected extracts suggested direct inhibition of thrombin activity by the insect extracts. DPPH scavenging activity of selected extracts showed that the extract of A. cinerea cinerea (Thunberg), D. baccarum Linne, L. divaricatus Motschulsky and N. concolor sp. has good antioxidant activity as well as antithombin activity. Our results suggested that some of korean wild insects could be developed as a natural source of antithrombosis.

• Molecules and Cells
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• v.19 no.3
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• pp.375-381
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• 2005

Phospholipase C-${\beta}$ (PLC-${\beta}$) hydrolyses phosphatidylinositol 4,5-bisphosphate and generates inositol 1,4,5-trisphosphate in response to activation of various G protein-coupled receptors (GPCRs). Using glial cells from knock-out mice lacking either PLC-${\beta}1$ [PLC-${\beta}1$ (-/-)] or PLC-${\beta}3$ [PLC-${\beta}3$ (-/-)], we examined which isotype of PLC-${\beta}$ participated in the cellular signaling events triggered by thrombin. Generation of inositol phosphates (IPs) was enhanced by thrombin in PLC-${\beta}1$ (-/-) cells, but was negligible in PLC-${\beta}3$ (-/-) cells. Expression of PLC-${\beta}3$ in PLC-${\beta}3$ (-/-) cells resulted in an increase in pertussis toxin (PTx)-sensitive IPs in response to thrombin as well as to PAR1-specific peptide, while expression of PLC-${\beta}1$ in PLC-${\beta}1$ (-/-) cells did not have any effect on IP generation. The thrombin-induced $[Ca^{2+}]_i$ increase was delayed and attenuated in PLC-${\beta}3$ (-/-) cells, but normal in PLC-${\beta}1$ (-/-) cells. Pertussis toxin evoked a delayed $[Ca^{2+}]_i$ increase in PLC-${\beta}3$ (-/-) cells as well as in PLC-${\beta}1$ (-/-) cells. These results suggest that activation of PLC-${\beta}3$ by pertussis toxin-sensitive G proteins is responsible for the transient $[Ca^{2+}]_i$ increase in response to thrombin, whereas the delayed $[Ca^{2+}]_i$ increase may be due to activation of some other PLC, such as PLC-${\beta}4$, acting via PTx-insensitive G proteins.

• Archives of Pharmacal Research
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• v.9 no.3
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• pp.189-191
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• 1986

The effects of diterpene acids (i. e. pimaradienoic acid, kaurenoic acid, hydroxy cembratrienoic acid and dihydroxycembratetraenoic acid) on malondialdehyde generation by rat platelets in response to thrombin were studied. All the compounds inhibited the generation of MDA.

• Bulletin of the Korean Chemical Society
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• v.34 no.3
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• pp.721-722
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• 2013

• Archives of Pharmacal Research
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• v.10 no.2
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• pp.115-120
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• 1987

Methanol extract of Ilex pubescens roots prolonged bleeding time threefold, and inhibited the generation of malondialdehyde released during platelet aggregation inducted by thrombin. Through several purification procedures, its saponin, named ilexoside, was proved to be responsible for the antithrombotic activities of the plant. Ilexosides A, -D and -J and 24-carboxypomolic acid showed strong inhibitory activities on platelet aggregation induced by thrombin.

• Journal of Ginseng Research
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• v.32 no.1
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• pp.73-78
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• 2008

Red ginseng acidic polysaccharide (RGAP), isolated from Korean red ginseng (Panax ginseng C.A. Meyer), has been shown to have a variety of biological functions such as immunostimulating and anti-tumor activities. In the present study, we investigated whether RGAP inhibited ligand-induced platelet aggregation. The washed platelet-rich plasma was prepared from male SD rats with successive centrifugation. The platelets $(10^8/ml)$ were preincubated with 1 mM of $CaCl_2$ for 2 min either in the presence or in the absence of RGAP $(10{\sim}50\;{\mu}g/ml)$ and were stimulated with collagen (2.5 ${\mu}g/ml$) and thrombin (0.1 U/ml). RGAP dose-dependently inhibited thrombin-induced platelet aggregation with $IC_{50}$ value of $26.2{\pm}2.0$ ${\mu}g/ml$. In collagen-induced platelet aggregation, RGAP inhibited the reaction with an $IC_{50}$ value of $31.5{\pm}3.0\;{\mu}g/ml$. RGAP potently suppressed the intracellular calcium ion, which was stimulated by thrombin (0.1 U/ ml). Among mitogen-activated protein kinase (MAPK) subtypes, the extracellular signal-regulated kinase (ERK) 1/2 and p38 MAPK were analyzed in the present study. RGAP inhibited the phosphorylation of ERK2 and p38 MAPK, which was activated by collagen (2.5 ${\mu}g/ml$). Finally, these results suggested that besides saponin fraction, RGAP take an important role in the preventive effect of Korean red ginseng against cardiovascular disease such as thrombosis and atherosclerosis.