Objectives: This experiment investigated the antimicrobial activity of Hwangryunheadok-tang and extracts of Scutellariae radix , Phellodendri cortex , Coptis rhizome , and Gardenia jasminoides against Salmonella typhimurium . Methods: After spreading S. typhimurium on a bacterial culture medium plate, antimicrobial activity was tested by dripping diluted Hwangryunheadok-tang or extracts of Scutellariae radix , Phellodendri cortex , Coptis rhizome , or Gardenia jasminoides (80 μl, diluted 100, 50, 10, and 1%) onto the plate, followed by culture for 16 to 72 hours. The minimal inhibitory concentration (MIC) was tested by dripping the minimum dilution that showed antimicrobial activity (80, 60, 40, and 20 μl) and measuring the density. The antimicrobial activity of Hwangryunheadok-tang and four extracts showed continuous antibacterial activity against S. typhimurium throughout the experiment. Result: 1. S. typhimurium . (Standard Microorganism, ATCC) 1) The Hwangryunheadok-tang and extracts of Scutellariae radix , Phellodendri cortex , and Coptis rhizome showed antibacterial activity in the undiluted solutions and in 50% dilutions. Gardenia jasminoides extract showed potency only in the undiluted solution. The antimicrobial potency of the undiluted solution was increased when the volume of inoculation was increased, but no difference was noted when the culture time was extended. All the extracts showed antimicrobial potency against S. typhimurium . 2. S. typhimurium isolated from diarrhea patients 1) When compared to the standard microorganism experiment on S. typhimurium , the MICs of the five extracts were increased. However, whereas the antimicrobial potency of doxycycline was lost entirely against bacteria isolated from patients with diarrhea, the antimicrobial potency of all the extracts was diminished but did not disappear. 2) The antimicrobial activity of Hwangryunheadok-tang and four extracts was continuous even when the culture time was extended to 16, 24, and 72 hours. Conclusions: The Hwangryunheadok-tang and four kinds of extracts have antimicrobial activity against S. typhimurium . Comparison of a standard microorganism with S. typhimurium isolated from diarrhea patients showed that the antimicrobial activity of all the extracts was better than that of antibiotics. Further studies should focus on the value and benefits of Hwangryunheadok-tang , and the four kinds of extracts as clinical treatments.
Tetracycline antibiotics have been widely used not only therapeutics but feed additives. There are many methods for the isolation and determination of tetracycline antibiotics in animal muscle tissue. But those methods take much time and labor, so it is difficult to analyse many samples simultaneously. A rapid isolation method and liquid chromatographic determination of tetracycline antibiotics in animal muscle tissue (bovine, porcine, chicken) is presented. Blank control and tetracyclines fortified samples (0.5g) were blended with $C_{18}$ containing 0.05g each of oxalic acid and disodium ethylenediaminetetraacetate. After homogenize, homogenate was transferred to glass column made from 10ml glass syringe and compressed to 4~4.5ml volume. A column made from the $C_{18}$/meat matrix was washed with hexane (8ml) and dichloromethane (8ml, if needed), following which the tetracyclines were eluted,vith methanol or 0.01M methanolic oxalic acid (8ml). The eluates containing tetracyclines analytes were free from interfering compounds when analysed by HPLC with UV detection (photodiode array at 360nm). Standard curve for each tetracycline showed a linear response at the range of $0.05{\sim}1.0{\mu}g/ml$ and tetracycline antibiotics were eluted within 4ml of eluted volume. All tetracycline antibiotics except tetracycline were stable during the concentration process at $40^{\circ}C$ and time required for concentration was 3~4 hours. Fortified samples containing oxalic aicd and EDTA represented more good recoveries than those of not-contained sample. Recoveries were 91.8~110.1% (oxytetracycline; OTC), 57.7~79.5% (tetracycline; TC), 78.1~88.6% (chlortetracyclines; CTC) and 88.4~100.6% (doxycycline; DC) in pork tissue, 101.1~126.8% (OTC), 66.4~75.4% (TC), 79.2~88.1% (CTC) and 69.3~86.7% (DC) in beef tissue, and 90.8~95.6% (OTC), 66.2~84.4% (TC), 75.7~77.2% (CTC) and 55.6~80.7% (DC) in chicken muscle tissue. The detection limits validated in muscle tissue by this method were $0.05{\mu}g/g$ for OTC and TC, and $0.1{\mu}g/g$ for CTC and DC.
Purpose: There are numerous reports about the usefulness of antibiotics such as doxycycline or metronidazole in the conventional treatment for the patients with chronic periodontal diseases. However, seldom are the reports about effects of vitamins or nutraceuticals. The purpose of this study was to evaluate the effects of nutrient supplement including multiple vitamins and neutraceuticals with PRF-K2 from plants and seaweed in treatment of the patients with chronic periodontitis which is needed a nonsurgical or a surgical treatment by evaluating the clinical parameters and the gingival crevicular fluid volume. Methods: The systemically healthy and nonsmoking patients diagnosed with chronic periodontitis were divided into a nonsurgical group and a surgical group. They were also divided into the test group with nutrient supplements and the control group without nutrient supplements. In the nonsurgical group, the clinical parameters (probing depth, clinical attachment level, sulcus bleeding index, and plaque index) and the gingival crevicular fluid volume were checked on baseline, at 1 week, at 3 week and at 9 week after a supplement treatment. In the surgical group, the clinical parameters and the gingival crevicular fluid volume were also checked at 15 week after a surgical treatment. Results: In both nonsurgical and surgical groups, reduction of pocket depth and increment of clinical attachment level were revealed in the test group compared with the control group, but there was not statistically significant difference (p>0.05), and sulcus bleeding index was decreased with statistically significant difference (p<0.05). In addition, plaque index was decreased with statistically significant difference (p<0.05) in the nonsurgical group. Gingival crevicular fluid volume was decreased with statistically significant difference (p<0.05) at week 9 in both non-surgical and surgical groups. Conclusions: In conclusion, our results demonstrate that providing nutrient supplement in both nonsurgical or surgical periodontal treatments may improve gingival inflammation and gingival crevicular fluid.
This study was conducted to monitor residues of 10 veterinary drugs in food products. Various veterinary drugs were examined including enrofloxacin, ciprofloxacin, norfloxacin, oxolinic acid, amoxicillin, ampicillin, oxytetracycline, tetracycline, chlortetracycline, and doxycycline in beef, pork, egg, chicken, eel, flatfish, and rockfish obtained from 6 different regions (Seoul, Incheon, Daejeon, Gwangju, Daegu, Busan). Residues were detected in 21 (6.5%) samples out of 321 samples. In particular, 2 (1.0%) livestock samples had detected residues among 203 products, and 19 (16.1%) aquaculture samples had residues detected among 118 products. The most frequently detected drug residues in aquaculture products were oxytetracycline and amoxicillin, but the levels were mostly below the MRL (Maximum Residue Limit). In only one flatfish sample, amoxicillin was found at a level higher than the MRL (0.05 mg/kg). In livestock products, residues of most veterinary drugs were not detected. But enrofloxacin was detected in 2 chicken (Korean name: Ogolgae) samples at a higher level than the MRL (0.1 mg/kg as the sum of ciprofloxacin).
Dal-Ah Kim;Mi-Ran Lee;Hyung Jung Oh;Myong Kim;Kyoung Hye Kong
BMB Reports
/
v.56
no.3
/
pp.196-201
/
2023
Renal fibrosis is the final manifestation of chronic kidney disease (CKD) regardless of etiology. Hypoxia-inducible factor-2 alpha (HIF-2α) is an important regulator of chronic hypoxia, and the late-stage renal tubular HIF-2α activation exerts protective effects against renal fibrosis. However, its specific role in progressive renal fibrosis remains unclear. Here, we investigated the effects of the long-term tubular activation of HIF-2α on renal function and fibrosis, using in vivo and in vitro models of renal fibrosis. Progressive renal fibrosis was induced in renal tubular epithelial cells (TECs) of tetracycline-controlled HIF-2α transgenic (Tg) mice and wild-type (WT) controls through a 6-week adenine diet. Tg mice were maintained on doxycycline (DOX) for the diet period to induce Tg HIF-2α expression. Primary TECs isolated from Tg mice were treated with DOX (5 ㎍/ml), transforming growth factor-β1 (TGF-β1) (10 ng/ml), and a combination of both for 24, 48, and 72 hr. Blood was collected to analyze creatinine (Cr) and blood urea nitrogen (BUN) levels. Pathological changes in the kidney tissues were observed using hematoxylin and eosin, Masson's trichrome, and Sirius Red staining. Meanwhile, the expression of fibronectin, E-cadherin and α-smooth muscle actin (α-SMA) and the phosphorylation of p38 mitogen-activated protein kinase (MAPK) was observed using western blotting. Our data showed that serum Cr and BUN levels were significantly lower in Tg mice than in WT mice following the adenine diet. Moreover, the protein levels of fibronectin and E-cadherin and the phosphorylation of p38 MAPK were markedly reduced in the kidneys of adenine-fed Tg mice. These results were accompanied by attenuated fibrosis in Tg mice following adenine administration. Consistent with these findings, HIF-2α overexpression significantly decreased the expression of fibronectin in TECs, whereas an increase in α-SMA protein levels was observed after TGF-β1 stimulation for 72 hr. Taken together, these results indicate that long-term HIF-2α activation in CKD may inhibit the progression of renal fibrosis and improve renal function, suggesting that long-term renal HIF-2α activation may be used as a novel therapeutic strategy for the treatment of CKD.
Since April 2012, doctor fish in the breeding tank and in the quarantine tank in Hanwha Aquaplanet Yeosu Aquarium have been dying, accompanied by diffuse bleeding around the mouth, in the chin, and at the bottom of the abdomen. In this study, the cause of death would be examined through the bacteriological study of doctor fish and the rearing water quality in the aquarium. The water quality and the bacterial counts of the rearing water in the exhibit tank and in the quarantine tank were analyzed once a week, starting from August to November 2014. Water quality was measured based on the following data: temperature was in the range of 24.5~26.8℃, pH at 6.77~7.94, DO at 6.15~8.61 ppm, ammonia at 0~0.93 ppm, nitrite at 0.009~0.075 ppm, and nitrate at 1.1~40.9 ppm. Studies revealed that the differences in these water quality factors were not related to the death of doctor fish. Bacterial counts in the rearing waters of Garra rufa slightly increased to 103~104 CFU/ml, just before the death of the doctor fish. Twelve strains of bacteria were isolated from the dead fish and rearing waters. The isolates were identified as Aeromonas veronii, Citrobacter freundii, Pseudorhodoferax aquiterrae, Shewanella putrefaciens, and Vibrio anguillarum on the basis of 16S rRNA gene sequences. The most dominant species was C. freundii, which showed medium sensitivity to florfenicol and norfloxacin, and was resistant to amoxacillin, doxycycline, oxytetracycline, tetracycline, and trimethoprim. Ten isolates were confirmed to be pathogenic to the doctor fish. Doctor fish infected with C. freundii and S. putrefaciens showed high mortality in the experimental groups. These results indicate that the variation in bacterial numbers in the rearing water was related to the death of doctor fish. C. freundii and S. putrefaciens were directly implicated in causing the death of doctor fish in the aquarium.
Photobacterium sp. YW2207 was isolated from rainbow trout raised in a fish farm located in Yeongwol-gun, Gangwon Province, South Korea. Based on 16S rRNA sequence analysis and phylogenetic analysis, it was confirmed that Photobacterium sp. YW2207 showed 100% similarity with Photobacterium piscicola and Photobacterium phosphoreum, and 94.6% similarity with P. damselae subsp. damselae. Biochemical analysis revealed that Photobacterium sp. YW2207 is a Gram-negative, motile bacterium with a cell size of 1.5~3×3~5 ㎛. The bacteria were cultured on nutrient agar, brain heart infusion agar, Muller-Hinton agar, tryptic soy agar, and thiosulfate citrate bile sucrose agar with NaCl concentrations ranging from 0 to 2.5%. The API50CHE and API20E tests indicated lower utilization capabilities compared to the P. damselae strains provided in the API database. Furthermore, unlike most Photobacterium species, Photobacterium sp. YW2207 presented negative for catalase test. Results from the flow cytometric measurement indicated that Photobacterium sp. YW2207 exhibited a more diverse distribution of cell sizes and had larger cell sizes compared with P. damselae subsp. damselae. Minimum inhibitory concentration tests showed that Photobacterium sp. YW2207 had low susceptibility to β-Lactam and aminoglycoside antibiotics, while having high susceptibility to tetracycline, doxycycline, and quinolone antibiotics. Pathogenicity on rainbow trout revealed that an immersion of 1×105 CFU/ml did not cause mortality or clinical symptoms.
The Journal of the Korean Society for Microbiology
/
v.9
no.1
/
pp.7-11
/
1974
The authors identified fifty-eight Shigella cultures among 1644 cultures and specimens of enteric pathogens collected from all over the country in 1973. Fifty-one out of fifty-eight cultures belonged to Shigella flexneri and the rest to Shigella sonnei. None of cultures belonging to either subgroup A or C was detected in 1973. Of fifty-one cultures of Shigella flexneri twenty-six cultures were $B_{2a}$, which were isolated in Seoul area and Kwangwon-Do. The rest were $B_{3a}$ which were isolated in Jeonla-bug-Do and Kangwon-Do. It would not be possible to understand that there might not have been the cases or carriers of Shigella in the areas where the organisms were not isolated in 1973 and that there might not have been any other serotypes existing in the country, although there was a quite disparity found in the distribution between different areas and in the detection of the serotypes as shown in Table 1. Concerning the biochemical properties there were only two cultures showing positive arginine decarboxylase test among $B_{2a}$, and there were three cultures of trehalose negative cultures, one of rhamnose positive culture and one of glycerol positive culture observed, which were considered to be unusual. All the Shigella cultures were sensitive to nitrofurantoin, cephalosporin and ampicillin, and resistant to colistin, bacitracin and neomycin. Majority of them showed sensitive results to gentamycin, and the majority of Shigella $B_{3a}$ appeared to be sensitive to chloramphenicol, tetracycline, oxytetracycline and doxycycline, but the majority of $B_{2a}$ and Shigella sonnei were observed resistant to those antibiotics by means of the In-Vitro tests.
In this study, we constructed and tested retrovirus vectors designed to express the human thrombopoietin gene under the control of the tetracycline-inducible promoters. To increase the hTPO gene expression at him-on state, WPRE sequence was also introduced into retrovirus vector at downstream region of either the hTPO gene or the sequence encoding reverse tetracycline-controlled transactivator (rtTA). Primary culture cells (PFF, porcine fetal fibroblast; CEF, chicken embryonic fibroblast) infected with the recombinant retrovirus were cultured in the medium supplemented with or without doxycycline for 48hr, and induction efficiency was measured by comparing the hTPO gene expression level using RT-PCR, western blot and ELISA. Higher hPTO expression and tighter expression control were observed from the vector in which the WPRE sequence was placed at downstream of the hTPO (in CEF) or rtTA(in PFF) gene. This resulting tetracycline inducible vector system may be helpful in solving serious physiological disturbance problems which have been a major obstacle in successful production of transgenic animals.
The Journal of the Korean Society for Microbiology
/
v.8
no.1
/
pp.7-11
/
1973
The authors identified eighty-eight Shigella cultures among about four thousands specimens collected from all over the country in 1972. Of eighty-eight cultures, seventy-seven cultures belonged to Shigella flexneri and eleven cultures to Shigella sonnei. None of cultures belonging to either subgroup A or C was detected in 1972. Of seventy-seven cultures of Shigella flexneri one was $B_{1b}$, fifty-six were $B_{2a}$, nine were $B_{3a}$, six were $B_{4a}$, three were By and one was each of $B_{3b}$ and $B_{3c}$. Of eleven cultures of Shigella sonnei seven cultures appeared to be phase I and the others phase II. Although there was quite a difference found in the incidence of isolating Shigella organisms between different areas as shown in Table 1, it would not be possible to understand that there might not have been the cases or carriers of Shigella in the areas where the organisms were not isolated in 1972. Concerning the biochemical properties it was not possible to compare the results obtained from the decarboxylase and dihydrolase tests with them obtained in previous years except that of lysine decarboxylase tests since they were not reported individually by the different serotypes in the previous reports. These results obtained in 1972 would be the data for the future comparison. In regards to the antibiotics-sensitivity of Shigella cultures the most of them showed sensitive results to nitrofurantoin, ampicillin, cephalosporin, gentamycin and geopen, and the majority of them appeared to be resistant to cloxacillin, tetracycline and streptomycin by means of the In Vitro tests.
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