Epidermal keratinocytes are important sources of a wide variety of cytokines that include the endothelin-1 (ET-1). Glucocorticoids have been shown to inhibit the production of several cytokines. However, their effect on ET-1 synthesis by keratinocytes is still unknown. It has been reported that ultraviolet B (UVB) irradiation stimulates both the synthesis and release of ET-1 and it was observed that ET-1 secretion by HaCat cells increased with increasing UVB exposure. In this study, the effects of glucocorticoid on ET-1 production were evaluated using cultured HaCat keratinocytes. The results showed that dexamethasone suppressed basal re-lease of ET-1. In addition, it strongly inhibited the UVB-mediated augmentation of ET-1 production. Furthermore, lincomycin slightly enhanced the inhibitory effect of dexamethasone on ET-1 synthesis.
Cytokines ; Dexamethasone* ; Endothelin-1 ; Glucocorticoids ; Keratinocytes* ; Lincomycin

As a material of metal-ceramic prosthesis, nickel as a form of Ni-Cr alloy has been used for many dental prostheses in many cases. However, several problems in use of the alloy have been revealed (ex ; tissue stimulation, skin allergy, hypersensitivity, cytotoxicity and carcinogenecity). Little is known about nickel with respect to the relationship between Ni-prosthesis and gaining of Ni-resistance in oral microorganisms. The present study was undertaken to check wheather use of Ni-prosthesis leads to occurrence of Ni-resistant microorganisms. So this study may suggest the possible relationships between the oral microorganisms and nickel-resistance in oral enviroment. Bacteria were isolated from the gingival crevicular fluid on the patients wearing Ni-Cr prosthesis. The isolated bacteria were tested for their Ni-resistance in nickel containing media at different concentration from 3mM to 110mM. E. coli HB101 was used as control. The Ni-resistant bacteria were isolated and biochemically identified. The Ni-resistant bacteria were tested several biochemical, molecular-biological tests. Performed tests were ; measuring the growth curve, antibiotic test, growth ability test in liquid media, isolation of the chromosome and plasmid, digestion of DNA by restriction enzyme, electrophoresis of chromosome and plasmid DNA, identification of Ni-resistant genes by the DNA hybridization. The results were as follows: 1) The bacteria isolated from gingival crevicular fluid on the patients wearing Ni-Cr alloy prosthesis showed nickel-resistance. 2) The isolated microorganisms grew at nickel containing media of high concentrations (60mM-110mM). 3) Based on the biochemical tests, the isolated microorganisms were identified as Enterococcus faecalis(13 cases), Klebsiella pneumoniae(1 case) and Enterobacter gergoviae(1 case). 4) Enterococcus faecalis expressed not only nickel resistance but also the multi-drug resistanceto several antibiotics ; chloramphenicol, kanamicin, streptomycin, lincomycin, clindamycin. However all strain showed the sensitivity against the tetracycline. 5) DNA hybridization result suggest that there is no homology between the previousely known gene of nickel resistance in Klebsiella pneumoniae and chromosomal DNA Enterococcus faecalis.
Alloys* ; Anti-Bacterial Agents ; Bacteria* ; Chloramphenicol ; Clindamycin ; Dental Prosthesis ; Digestion ; DNA ; Electrophoresis ; Enterobacter ; Enterococcus ; Enterococcus faecalis ; Gingival Crevicular Fluid* ; Humans ; Hypersensitivity ; Klebsiella ; Klebsiella pneumoniae ; Lincomycin ; Nickel ; Plasmids ; Prostheses and Implants* ; Skin ; Streptomycin ; Tetracycline

As a material of metal-ceramic prosthesis, nickel as a form of Ni-Cr alloy has been used for many dental prostheses in many cases. However, several problems in use of the alloy have been revealed (ex ; tissue stimulation, skin allergy, hypersensitivity, cytotoxicity and carcinogenecity). Little is known about nickel with respect to the relationship between Ni-prosthesis and gaining of Niresistance in oral microorganisms. The present study was undertaken to check whether use of Ni-prosthesis leads to occurrence of Ni-resistant microorganisms. So this study may suggest the possible relationships between the oral microorganisms and nickel-resistance in oral environment. Bacteria were isolated from the gingival crevicular fluid on the patients wearing Ni-Cr prosthesis. The isolated bacteria were tested for their Ni-resistance in nickel containing media at different concentration from 3mM to 110mM. E. coli HB101 was used as control. The Ni-resistant bacteria were isolated and biochemically identified. The Ni-resistant bacteria were tested several biochemical, molecular-biological tests. Performed tests were; measuring the growth curve, antibiotic test, growth ability test in liquid media, isolation of the chromosome and plasmid, digestion of DNA by restriction enzyme, electrophoresis of chromosome and plasmid DNA, identification of Ni-resistant genes by the DNA hybridization. The results were as follows: 1) The bacteria isolated from gingival crevicular fluid on the patients wearing Ni-Cr alloy prosthesis showed nickel-resistance. 2) The isolated microorganisms grew at nickel containing media of high concentrations (60mM-110mM). 3) Based on the biochemical tests, the isolated microorganisms were identified as E nterococcus faecalis(13 cases), Klebsiella pneumoniae(1 case) and Enterobacter gergoviae(1 case). 4) Enterococcus faecalis expressed not only nickel resistance but also the multi-drug resistance to several antibiotics; chloramphenicol, kanamicin, streptomycin, lincomycin, clindamycin. However, all strain showed the sensitivity against the tetracycline. 5) DNA hybridization result suggests that there is no homology between the previously known gene of nickel resistance in Klebsiella pneumoniae and chromosomal DNA of Enterococcus faecalis.
Alloys* ; Anti-Bacterial Agents ; Bacteria* ; Chloramphenicol ; Clindamycin ; Dental Prosthesis ; Digestion ; DNA ; Drug Resistance, Multiple ; Electrophoresis ; Enterobacter ; Enterococcus faecalis ; Gingival Crevicular Fluid* ; Humans ; Hypersensitivity ; Klebsiella ; Klebsiella pneumoniae ; Lincomycin ; Nickel ; Plasmids ; Prostheses and Implants* ; Skin ; Streptomycin ; Tetracycline

From the leprosy patients hospitalized at the Korean National Leprosarium on Snrokdo Island, forty-five leprosy patients with plantar ulcers were selected randomly for microbiological studies. A total of 84 strains of bacteria, with the most common being Neieseria sicca (25 strains: 29.8%), 34 strains (40. 5%) were present as a pure growth and 50 strains (59. 5%) were present in ulcers with multiple infection. Antibiotic susceptibility tests indicated that bacterial isolates were rather highly susceptible to gentarnicin and kanamycin, but varying degree of isolates were resistant to 12 antibiotics including streptomycin, rifampicin, lincomycin, penicillin, terramycin and colimycin etc. From a total of 30 plantar ulcers, 17 ulcers produced 24 strains of fungi and 1 strain of Balanticlium coli. They consisted of 17 strains of saprophytic fungi (70. 8%) and 7 strains of yeast-like fungi (29. 2%). Of the culture media for Balantidium coli, Sabourauds glucos medium is the most specific and selective that the author found.
Anti-Bacterial Agents ; Bacteria ; Balantidium ; Colistin ; Culture Media ; Foot Ulcer* ; Fungi ; Humans ; Kanamycin ; Leprosy* ; Lincomycin ; Oxytetracycline ; Penicillins ; Rifampin ; Streptomycin ; Ulcer

Our present knowledge of impetigo contagiosa extends from its first description as a separate clinical entity by Fox in I864, and the proof of its bacterial etiology by Radcliffe-Crocker in 1881. Both staphylococci and streptococci have been discovered from the lesions, but the relative preponderance of each varies greatly, and reports are contradictory. Seventy-eight patients with impetigo contagiosa were studied bacteriologically in order to ascertain the primary etiologic agent. Also, a susceptibility test (Bauer- Kirby method) was done on the isolated organisms with 7 antibiotics which are used frequently in the clinical field. Specimens obtained from the skin lesions were cultured and organisms were isolated. They were identified by various biochemical and serological tests. A DN ase test, a carbohydrate fermentation test, and a coagulase test were done for the isolated staphylococci. A bacitracin disc method and a precipitin test(Lancefield method) were done for the isolated B-hemolytic streptococci. The results were as follows: Fifty-six cases(71.8%) were infected by staphylococcus only. Twenty cases(25.6%) were infected by a mixture of staphylococcus and p-hemo- lytic streptococcus. Only 2 cases(2.6%) were infected by B-hemolytic streptococcus alone. All 76 strains of staphylococci were identified as coagulase positive staphylococci. Among the 22 strains of B-hemolytic streptococci, 15 strains were identified as group A and remaining 7 strains were identified as group B. Coagulnse negative sta,phylococcus was not found. In the susceptibility test to 7 antibiotics, staphylococci showed susceptibility to lincomycin, erythromycin, cloxacillin, and chloramphenicol, and resistance to tetra-cycline, penicillin, and ampicillin. Streptococci showed susc.ptibility to all of the above antibiotics except tetracycline. From the results of this experiment, it was concluded that the primary etiologic agent of impetigo contagiosa was coagulase positive staphylococcus and streptococcus for the most part can be considered as a secondarily infecting agent. Coagulase negative staphylococcus apparently is not implicated as an etiologic agent of impetigo contagiosa. The results of the antibiotic susceptibility tests would seem to indicate that the use of such antibiotics as tetracycline, penicillin, and ampicillin is not indicated in the treatment of impetigo contagiosa.
Ampicillin ; Anti-Bacterial Agents ; Bacitracin ; Chloramphenicol ; Cloxacillin ; Coagulase ; Erythromycin ; Fermentation ; Humans ; Impetigo ; Lincomycin ; Penicillins ; Serologic Tests ; Skin ; Staphylococcus ; Streptococcus ; Tetracycline

A) Bacteriological study and sensitivity test against antimicrobial agents were made on 126 cases of infantile and childhood shigellosis treated at pediatric epartment of St. Vincent hospital from April, 78 to September, 80. The results are follows: 1. Sh. flexneri was most frequently isolated(86.5%) and the next was Sh. sonnei(13.5%). 2. The percentage of resistant strains against antimicrobial agents. Ampicillin: 95.2% Carbenicillin : 90.5% Cephalothin: 78.6% Choloramphenicol: 95.2% Gentamicin: 20.6% Kanamycin: 23.8% Lincomycin: 100% Methicillin: 100% B) The effect of rifampin on bacteriological cure and clinical course in group B shigellosis of sixty-four hospitalized children from one year to five years old age were compared with other antibiotics. gentamicin, ampicillin and trimethoprim-sulfamethoxazole. Based on our study, rifampin was most effective drug in curing of clinical symptoms of shigellosis and eradicating the organisms from stool, and gentamicin was similar effect. Trimethoprim-sulfamethoxazole twas less effective than rifampin and gentamicin, but more effective than ampicillin which has no appreciable effect on the course of shigellosis.
Ampicillin ; Anti-Bacterial Agents ; Anti-Infective Agents* ; Carbenicillin ; Cephalothin ; Child ; Child, Hospitalized ; Dysentery, Bacillary* ; Gentamicins ; Humans ; Kanamycin ; Lincomycin ; Methicillin ; Rifampin* ; Trimethoprim, Sulfamethoxazole Drug Combination

BACKGROUND: Antibiotics are often indiscriminately prescribed for respiratory tract infections. This study was conducted to describe the prescription pattern of family physicians for respiratory tract infections. METHODS: In each clinic of 50 representative family practitioners, about 20 consecutive patients with diagnosis of respiratory tract infection were enrolled into the study. The data were collected by questionnaire to physicians just after patient interview. RESULTS: The number of study subjects was 1020, of which 55.7% was less than 15 year old. Antibiotics were prescribed to 73.9% of total subjects. According to diagnosis, the antibiotic prescription rate was 51.5% in common cold, 86.0% in pharyngitis, 88.6% in bronchitis, 98.9% in sinusitis, and 100% in otitis media. In common cold, the factors which significantly increased the antibiotic prescription were 1)patient age less than 15 year old (OR=1.70, CI=1.06-2.73), 2)more than two visits during the same episode(OR=1.95, CI=1.27-2.99), 3)yellow and thick rhinorrhea(OR=2.22, CI=1.16-4.25), 4)yellow and thick sputum(OR=3.31, CI=1.34-8.19), and 5)throat injection(OR=2.50, CI=1.42-4.39). Among patients to whom antibiotics were prescribed, 48.7% of patients were given the antibiotics by intramuscular injection. The most frequently prescribed antibiotics were penicillin and macroride among per-oral medicine and ribostamycin and lincomycin among intramuscular medicine. The reason for antibiotic prescription were 1)posssibility of bacterial infection(43.4%), 2)prevention of bacterial complication(23.7%), and 3)definite evidence of bacterial infection(22.5%). CONCLUSION: Family practitioners prescribe antibiotics indiscriminately for the respiratory tract infection. The prescription was influence by patient's age, number of clinic-visit, and clinical symptoms and signs.
Adolescent ; Anti-Bacterial Agents* ; Bronchitis ; Common Cold ; Diagnosis ; Humans ; Injections, Intramuscular ; Lincomycin ; Otitis Media ; Penicillins ; Pharyngitis ; Physicians, Family ; Prescriptions* ; Respiratory System* ; Respiratory Tract Infections* ; Ribostamycin ; Sinusitis ; Surveys and Questionnaires

During the period from Jan. 1978 to June 1978, clinical and laboratory observations were done on the 46 cases of gonorrhea and 40 cases of non-specific urethritis at random selection in the Department of Urology, Korea University Hospital. The following results were obtained: 1. The average age of the gonorrheal patients were 24 years old and 30 years in non-specific urethritis patients. 2. The main clinical symptoms of gonorrheal patients were profuse yellowish urethral discharge found in 91.3 % of cases and painful urination in 37 %. The symptoms of non-specific urethritis patients showed scanty urethral discharge in 525 % of cases and urethral discomfort in 25%. 3. The incubation period of gonorrheal cases was 3 to 7 days while in one-fourth of non-specific urethritis the period was shorter than 10 days. 4. In the past history 43.5 % of gonorrheal patients had V. D. and 62.5 % of non-specific urethritis patients had them. 5. In 20 cases ( 50%) of non-specific urethritis had positive shred culture with no evidence of positive findings in urinalysis or in Gram stain of urine sediment. 6. In 31 cases(77.5%) of positive shred cultures, staphy lococcus albus were grown in 12 cases, diphtheroid in 10 cases, mixed growth of staphylococcus albus and diphtheroid in 5 cases. Antimicrobial sensitivity test with Gram(+) cocci obtained from 19 cases of nonspecific urethritis showed highly sensitive resultes to hentamicin, lincomycin, carbenicillin, novobiocin and highly resistant reactions to oxytetracycline. 7. 82.6% of cases of gonococcal infection were cultured on the Thayer-Martin medium and antimicrobial sensitivity test was done with these colonies by disc diffusion method. Penicillin and its derivatives were highly sensitive, other antibiotics such as erythromycin, oxytetracycline, chloramphenicol and gentamicin were also sensitive.
Anti-Bacterial Agents ; Carbenicillin ; Chloramphenicol ; Diffusion ; Erythromycin ; Gentamicins ; Gonorrhea* ; Humans ; Korea ; Lincomycin ; Novobiocin ; Oxytetracycline ; Penicillins ; Staphylococcus ; Urethritis* ; Urinalysis ; Urination ; Urology ; Young Adult

Salmonella spp. is an important pathogen to both public and swine industry. The aim of this study was to investigate the distribution of Salmonella serovar and antibiotics susceptibility of the isolates from Korean swine producing systems. A total of 63 (5.28%) Salmonella spp. was isolated from 1,194 samples (977 fecal materials and 67 organ samples). The predominant Salmonella (S.) enterica serotype and serovar was group B (69.8%) and S. Typhimurium (47.6%), S. Derby (20.6%) and S. Heidelberg (1.6%). But S. Cholerasuis which is characterized host specific by septicemia and enteritis to pigs was not isolated. Antimicrobial susceptibility of the isolates varies as follows: Norfloxacine (75%), Ciprofloxacin (67.5%), Amikacin (60%), Colistin (60%), Enrofloxacin (55%). All of isolates were resistant to Erythromycin, Penicillin, Tetracycline and Lincomycin. The results of this study provided useful information regarding antimicrobial susceptibility and resistance patterns to treat salmonellosis and to prevent emergence of multidrug resistance Salmonella.
Amikacin ; Anti-Bacterial Agents ; Ciprofloxacin ; Colistin ; Drug Resistance, Multiple ; Enteritis ; Erythromycin ; Fluoroquinolones ; Lincomycin ; Norfloxacin ; Penicillins ; Salmonella ; Salmonella Infections ; Sepsis ; Swine ; Tetracycline

Infectious coryza (IC) is an infectious disease caused by Avibacterium (Av.) paragallinarum. IC is known to cause economic losses in the poultry industry via decreased egg production in layers. Between 2012 and 2013, Av. paragallinarum was isolated from seven chicken farms by Chungbuk National University. We identified Av. paragallinarum, the causative pathogen of IC by polymerase chain reaction (PCR) and serovar serotype A, by multiplex PCR. Antibiotic sensitivity tests indicated that a few field-isolated strains showed susceptibility to erythromycin, gentamicin, lincomycin, neomycin, oxytetracycline, spectinomycin, and tylosin. A serological survey was conducted to evaluate the number of flocks that were positive for Av. paragallinarum by utilizing a HI test to determine the existence of serovar A. Serological surveys revealed high positivity rates of 86.4% in 2009, 78.9% in 2010, 70.0% in 2011, and 69.6% in 2012. We also challenged specific pathogen-free chickens with isolated domestic strains, ADL121286 and ADL121500, according to the measured efficacy of the commercial IC vaccine, PoulShot Coryza. We confirmed the effectiveness of the vaccine based on relief of clinical signs and a decreased re-isolation rate of ADL121500 strain. Our results indicate IC is currently prevalent in Korea, and that the commercial vaccine is effective at protecting against field strains.
Agriculture ; Chickens* ; Chungcheongbuk-do ; Communicable Diseases ; Erythromycin ; Gentamicins ; Korea ; Lincomycin ; Multiplex Polymerase Chain Reaction ; Neomycin ; Ovum ; Oxytetracycline ; Polymerase Chain Reaction ; Poultry ; Serogroup ; Spectinomycin ; Tylosin