The activation mechanism of K-induced contracture was studied in renal vascular muscle which does not generate an action potential readily and in taenia coli which generates a spike potential spontaneously. Helical strips of arterial muscle from rabbit renal arteries and longitudinal strips of taenia coli from guinea-pig's colons, respectively, were prepared. All experiments were performed in Tris-buffered Tyrode solution which was aerated with 100% $O_2$ and kept $35^{\circ}C$. Renal arterial muscles developed the contracture rapidly, which was composed of a small phasic and a large tonic components, when exposed to a 40 mM K-Tyrode solution. In the absence of external $Ca^{++}$, however, no K-contracture appeared. The contracture induced by K-depolarization was abolished by the treatment with verapamil, which is known to be a selective $Ca^{++}-blocker$ through potential-sensitive $Ca^{++}-channel$. K-contracture of taenia coli showed the contracture composed of a large phasic and a small tonic components. In the $Ca^{++}-free$ Tyrode solution, only the tonic component was abolished and almost no change in the phasic component was observed. The amplitude of tonic component was dependent on the external $Ca^{++}$; The tonic component increased dose-dependently by a stepwise increase of the external $Ca^{++}$, and this component decreased in parallel with the increase of verapamil in the external medium. The results of this experiment suggest that K-contracture of rabbit renal artery is the direct result of the influx of the external $Ca^{++}$, while that of taenia coli is the result of both $Ca^{++}$ influx and the release of sequestered $Ca^{++}$.
Journal of Physiology & Pathology in Korean Medicine
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v.23
no.6
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pp.1332-1340
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2009
Moxa-combustion therapy makes use of heat stimulus and chemicals result form when cauterize the skin with moxa cones to medical cares. Despite an extensive evidence-base guiding the selection of stimulation parameters and attributes of subject, little methodologically research regarding the attributes of moxa cautery in need to provide effective stimulation. To determine moxibustion's effects of the three different moxa cautery made by three different company(as A, B, C), the small intestinal motility in rats were observed after moxibustion at ST36. Under anesthesia, each intensities(1, 5, 10 times), two regions(left and right at ST36) and a quantity(as number of 1, 5, 10 times at once) were applied to the groups divided with sex. In each intensities groups, the A product made increase with 5, 10 times in male and female group. The B and C product made increase with 10 times in male group and the B product made increase with 1, 5, 10 times and the C product made increase with 5 times in female group. In two regions(left and right at ST36) groups, the A and C product made increase with 1(right), 5(right) times and the B product made increase with 1(left), 10(left), 10(right) times in male group. In female group, the A product made increase with 5(left), 5(right), 10(right) times and the B product made increase with 1(left), 10(left), 10(right) times and the C product made increase with 5(left), 10(left) times. In a quantity(as number of 1, 5, 10 times at once) groups, the A and B product did not show any changes but the C product made increase with a quantity of 10 times in male group. In female group, The B product made increase with a quantity of 1 times and the C product made increase with a quantity of 5 times, but the A product did not show any changes. Three different moxa cautery made by three different company made differents result in each group divided with sex. With these results, it was suggested that we should consider the a process of manufacture and moxa cautery's quality for the adequate value of moxibustion.
Yi, Seung-Won;Lee, Han Gyu;So, Kyoung-Min;Kim, Eunju;Jung, Young-Hun;Kim, Minji;Jeong, Jin Young;Kim, Ki Hyun;Oem, Jae-Ku;Hur, Tai-Young;Oh, Sang-Ik
Animal Bioscience
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v.35
no.11
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pp.1698-1710
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2022
Objective: Raw potato starch (RPS) is resistant to digestion, escapes absorption, and is metabolized by intestinal microflora in the large intestine and acts as their energy source. In this study, we compared the effect of different concentrations of RPS on the intestinal bacterial community of weaned piglets. Methods: Male weaned piglets (25-days-old, 7.03±0.49 kg) were either fed a corn/soybean-based control diet (CON, n = 6) or two treatment diets supplemented with 5% RPS (RPS5, n = 4) or 10% RPS (RPS10, n = 4) for 20 days and their fecal samples were collected. The day 0 and 20 samples were analyzed using a 16S rRNA gene sequencing technology, followed by total genomic DNA extraction, library construction, and high-throughput sequencing. After statistical analysis, five phyla and 45 genera accounting for over 0.5% of the reads in any of the three groups were further analyzed. Furthermore, short-chain fatty acids (SCFAs) in the day 20 fecal samples were analyzed using gas chromatography. Results: Significant changes were not observed in the bacterial composition at the phylum level even after 20 d post feeding (dpf); however, the abundance of Intestinimonas and Barnesiella decreased in both RPS treatment groups compared to the CON group. Consumption of 5% RPS increased the abundance of Roseburia (p<0.05) and decreased the abundance of Clostridium (p<0.01) and Mediterraneibacter (p< 0.05). In contrast, consumption of 10% RPS increased the abundance of Olsenella (p<0.05) and decreased the abundance of Campylobacter (p<0.05), Kineothrix (p<0.05), Paraprevotella (p<0.05), and Vallitalea (p<0.05). Additionally, acetate (p<0.01), butyrate (p<0.05), valerate (p = 0.01), and total SCFAs (p = 0.01) were upregulated in the RPS5 treatment group Conclusion: Feeding 5% RPS altered bacterial community composition and promoted gut health in weaned piglets. Thus, resistant starch as a feed additive may prevent diarrhea in piglets during weaning.
Kang Chang Hee;Myung Eu Gene;Kang Hee;Choi Sun Mi;Shim Bum Sang;Kim Sung Hoon;Choi Seung Hoon;Shin Hyeun Kyoo;Kim Dong Hyun;Ahn Kyoo Seok
Journal of Physiology & Pathology in Korean Medicine
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v.18
no.6
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pp.1686-1693
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2004
Ekong-san(EKS) was expected to have inhibitory effects on angiogenesis, considering the fact that its constituents such as Ginseng Radix, Glycyrrhizae Radix and Citri Pericarpium were reported to inhibit angiogenesis. Moreover, recently several metabolites transformed by the human intestinal microflora were reported to enhance effectiveness compared to their crude drugs. Based on these data, this study was designed to confirm whether the EKS metabolites (EKS-M) can significantly exert the anti-angiogenic and anti-metastatic activites. Hence, with EKS and EKS-M, viability assay, proliferation assay, in vitro tube formation assay, gelatin zymogram assay, in vitro invasion assay were carried out. EKS showed less toxicity in ECV304 and HT1080 cells than EKS-M. EKS-M inhibited the proliferation of HT1080 cells by 30% at 200㎍/㎖ and 42% at 400 ㎍/㎖ respectively. Also, EKS-M degraded the tube network at 200㎍/㎖. EKS and EKS-M inhibited the expression of MMP-9 at 200 and 400㎍/㎖ in HT1080 cells. EKS reduced the invasive activity of HT1080 cells through matrigel coated transfilter atthe concentration of 200㎍/㎖ more effectively than EKS-M. These data suggest that EKS and EKS-M has anti-angiogenic and anti-metastatic activities.
In nature, two different types of fructose polymers (fructan) are generally found in dietary fibers; these are the fructose homopolymers levan, which is of high molecular weight and is $\beta$-(2,6)-linked, and inulin, which is of low molecular weight and is $\beta$-(2,1)-linked. The effects of levan and inulin on the intestinal physiology of rats were compared. Sprague Dawley rats were fed one of three diets for 3 weeks: a control diet, a basal diet containing 7% of levan, and a basal diet containing 7% of inulin. Cecal enlargement, together with the lowering of cecal pH, occurred in rats fed on the levan and inulin diets (p < 0.05). The levan and inulin diets resulted in a two-fold increase in the amount of short-chain fatty acids in the cecum, when compared to the control diet. The number of total microbes and of lactic acid-producing bacteria in the feces were higher in rats fed the fructan diets than those in rats fed control diet (p < 0.05). The levan diet also significantly increased the cecal $\alpha$-galactosidase activity by 3.8-fold, when compared to the control diet, indicating that levan stimulated the growth of Bifidobacteria in the cecum. These results show that the intake of levan and inulin stimulated the growth of lactic acid-producing bacteria in the cecum and thereby improved intestinal conditions in rats. (Korean J Nutrition 35(9) : 912~918,2002)
Journal of Physiology & Pathology in Korean Medicine
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v.30
no.6
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pp.439-446
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2016
The purpose of this study was to examine the effects of Angelica gigas Nakai on ulcerative colitis. Mice were divided into 5 groups: Control group, DSS group, 5-ASA group, 50mg/kg Angelica gigas Nakai group, 100mg/kg Angelica gigas Nakai group. Four groups, excluding the control group, were fed a 5% solution of dextran sulfate sodium(DSS) in water for 7days to induce ulcerative colitis. Each water extract was administrated orally for 7 days in 5-ASA group, 50mg/kg Angelica gigas Nakai group and 100mg/kg Angelica gigas Nakai group. 5 groups were evaluated by weight, length of intestine, weight of spleen, disease activity index(DAI), amount of cytokine IL-6 production, thickness of bowel wall and degree of inflammatory cell infiltration and intestinal tissue damage. Comparing to DSS group, 100 mg/kg Angelica gigas Nakai group showed significant suppressive effect of weight loss until 4th day of experiment while 50 mg/kg Angelica gigas Nakai group showed no significant effect of suppression. Decrease of intestinal length, enlargement of spleen, intestinal tissue damage and thickening of bowel wall were significantly suppressed in both 50 mg/kg and 100mg/kg Angelica gigas Nakai group. Also disease activity and cytokine IL-6 production were inhibited significantly. Based on this result, Angelica gigas Nakai seemed to have anti-inflammatory effect and also seemed to suppress histological changes and aggravation of ulcerative colitis.
The present study was attempted to investigate the effect of vasoactive intestinal polypeptide (VIP) on secretion of catecholamines (CA) and to establish whether there is the existence of a noncholinergic mechanism in adrenomedullary CA secretion from the isolated perfused rat adrenal gland. The perfusion into an adrenal vein of VIP $(3{\times}10^{-6}\;M)$ for 5 min or the injection of acetylcholine (ACh, $5.32{\times}10^{-3}\;M$) resulted in great increases in CA secretion. Tachyphylaxis to releasing effect of CA evoked by VIP was not observed by the repeated perfusion. The net increase in adrenal CA secretion evoked by VIP still remained unaffected in the presence of atropine or chlorisondamine. However, the CA release in response to ACh was greatly inhibited by the pretreatment with atropine or chlorisondamine. The releasing effects of CA evoked by either VIP or ACh were depressed by pretreatment with nicardipine, TMB-8, and the perfusion of $Ca^{2+}$-free medium. Moreover, VIP- as well as ACh-evoked CA secretory responses were markedly inhibited under the presence of $(Lys^1,\;Pro^{2.5},\;Arg^{3.4},\;Tyr^6)-VIP$ or naloxone. CA secretory responses induced by ACh and high $K^+\;(5.6{\times}10^{-2}\;M)$ were potentiated by infusion of VIP $(3{\times}10^{-6}M\;for\;5\;min)$. Taken together, these experimental results indicate that VIP causes CA release in a fashion of calcium ion -dependence, suggesting strongly that there exists a noncholinergic mechanism that may be involved in the regulation of adrenomedullary CA secretion through VIP receptors in the rat adrenal gland, and that VIP may be the noncholinergic excitatory secretagogue present in the chromaffin cells.
A splanchic artery occlusion for 90 min followed by reperfusion of the mesenteric circulation resulted in a severe form of circulatory shock, characterized by endothelial dysfunction, severe hypotension, marked intestinal tissue injury, and a high mortality rate. The effect of defibrotide, a complex of single-stranded polydeoxyribonucleotides having antithrombotic effect, was investigated in a model of splanchnic artery occlusion (SAO) shock in urethane anesthetized rats. Occlusion of the superior mesenteric artery for 90 min produced a severe shock state, resulting in a fatal outcome within 120 min of reperfusion in many rats. Defibrotide (10 mg/kg body weight) 10 min prior to reperfusion significantly improved mean arterial blood pressure in comparison to vehicle treated rats (p<0.05). Defibrotide treatment also significantly attenuated in the increase of plasma amino nitrogen concentration, intestinal myeloperoxidase activity, intestinal lipid peroxidation, infiltration of neutrophils in intestine and thrombin induced adherence of neutrophils to superior mesentric artery segments. Superoxide anion and hydrogen peroxide production in $1{\mu}M$ formylmethionylleucylphenylalanine (fMLP)-activated PMNs was inhibited by defibrotide in a dose-dependent fashion. Defibrotide effectively scavenged hydrogen peroxide, but not hydroxyl radical. Treatment of SAO rats with defibrotide inhibited tumor necrosis factor-${\alpha}$, and interleukin-1${\beta}$ productions in blood in comparison with untreated rats. These results suggest that defibrotide partly provides beneficial effects by preserving endothelial function, attenuating neutrophil accumulation, and antioxidant in the ischemic reperfused splanchnic circulation
Bae, Soo Hyeon;Park, Wan-Su;Han, Seunghoon;Park, Gab-jin;Lee, Jongtae;Hong, Taegon;Jeon, Sangil;Yim, Dong-Seok
The Korean Journal of Physiology and Pharmacology
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v.22
no.3
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pp.321-329
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2018
It was recently reported that the $C_{max}$ and AUC of rosuvastatin increases when it is coadministered with telmisartan and cyclosporine. Rosuvastatin is known to be a substrate of OATP1B1, OATP1B3, NTCP, and BCRP transporters. The aim of this study was to explore the mechanism of the interactions between rosuvastatin and two perpetrators, telmisartan and cyclosporine. Published (cyclosporine) or newly developed (telmisartan) PBPK models were used to this end. The rosuvastatin model in Simcyp (version 15)'s drug library was modified to reflect racial differences in rosuvastatin exposure. In the telmisartan-rosuvastatin case, simulated rosuvastatin $C_{maxI}/C_{max}$ and $AUC_I/AUC$ (with/without telmisartan) ratios were 1.92 and 1.14, respectively, and the $T_{max}$ changed from 3.35 h to 1.40 h with coadministration of telmisartan, which were consistent with the aforementioned report ($C_{maxI}/C_{max}$: 2.01, $AUC_I/AUC$:1.18, $T_{max}:5h{\rightarrow}0.75h$). In the next case of cyclosporine-rosuvastatin, the simulated rosuvastatin $C_{maxI}/C_{max}$ and $AUC_I/AUC$ (with/without cyclosporine) ratios were 3.29 and 1.30, respectively. The decrease in the $CL_{int,BCRP,intestine}$ of rosuvastatin by telmisartan and cyclosporine in the PBPK model was pivotal to reproducing this finding in Simcyp. Our PBPK model demonstrated that the major causes of increase in rosuvastatin exposure are mediated by intestinal BCRP (rosuvastatin-telmisartan interaction) or by both of BCRP and OATP1B1/3 (rosuvastatin-cyclosporine interaction).
The study was conducted to investigate the role of vitamin E in the high altitude hypoxia-induced damage to the intestinal barrier in rats. Sprague-Dawley rats were divided into control (Control), high altitude hypoxia (HH), and high altitude hypoxia + vitamin E (250 mg/kg $BW^*d$) (HV) groups. After the third day, the HH and HV groups were placed in a hypobaric chamber at a stimulated elevation of 7000 m for 5 days. The rats in the HV group were given vitamin E by gavage daily for 8 days. The other rats were given equal volume saline. The results showed that high altitude hypoxia caused the enlargement of heart, liver, lung and kidney, and intestinal villi damage. Supplementation with vitamin E significantly alleviated hypoxia-caused damage to the main organs including intestine, increased the serum superoxide dismutase (SOD) (p< 0.05), diamino oxidase (DAO) (p< 0.01) levels, and decreased the serum levels of interleukin-2 (IL-2) (p< 0.01), interleukin-4 (IL-4) (p<0.001), interferon-gamma ($IFN-{\gamma}$) (p<0.01) and malondialdehyde (MDA) (p<0.001), and decreased the serum erythropoietin (EPO) activity (p<0.05). Administration of vitamin E significantly increased the S-IgA (p<0.001) in ileum and significantly improved the expression levels of occludin and $I{\kappa}B{\alpha}$, and decreased the expression levels of hypoxia-inducible factor 1 alpha and 2 alpha ($HIF-1{\alpha}$ and $HIF-2{\alpha}$), Toll-like receptors (TLR4), P-$I{\kappa}B{\alpha}$ and nuclear factor-${\kappa}B$ p65(NF-${\kappa}B$ P65) in ileum compared to the HH group. This study suggested that vitamin E protectis from intestinal injury caused by high altitude hypoxia environment. These effects may be related to the HIF and TLR4/NF-${\kappa}B$ signaling pathway.
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