1.Mechanism of Action of Antimicrobial Peptides Against Bacterial Membrane.
Jong Kook LEE ; Yoonkyung PARK
Journal of Bacteriology and Virology 2014;44(2):140-151
Resistance to antibiotics is becoming a very serious problem, with so-called superbugs exhibiting resistance to nearly all conventional antibiotic drugs. Consequently, these organisms often cause severe illness and even death. Alternatives to conventional antibiotics are antimicrobial peptides (AMPs). These widely expressed short peptides, which have been isolated from insects, plants, marine organisms and mammals, including humans, show strong antimicrobial activity against both Gram-negative and Gram-positive bacteria. Most AMPs act by disrupting the bacterial membrane through "Barrel-stave", "Toroidal pore", "carpet" mechanism. In addition, AMPs may prevent septic shock through strongly binding lipopolysaccharides and lipoteichoic acid located on the bacterial membrane. The action mechanisms of AMP to minimize the likelihood developing resistance to the peptides would be particular advantage. For these reasons, we anticipate that AMPs will replace conventional antibiotic drugs in a variety of contexts.
Anti-Bacterial Agents
;
Aquatic Organisms
;
Gram-Positive Bacteria
;
Humans
;
Insects
;
Lipopolysaccharides
;
Mammals
;
Membranes*
;
Peptides*
;
Shock, Septic
2.Nutritional Status in Alcohol- and Virus-Related Liver Cirrhosis.
Seokhwa LEE ; Yoonkyung JIN ; Choonsuhk KEE ; Yukyung CHANG
The Korean Journal of Hepatology 2000;6(1):59-72
AIMS: The purpose of this study was to explore the differences of general characteristics and nutritional factors such as anthropometry and dietary intake between alcohol-related cirrhosis and virus-related liver cirrhosis and to assess the nutritional status of both of these groups. METHODS: In this study, the nutritional status of 67 patients with liver cirrhosis (25 with alcohol-related and 42 with virus-related) was evaluated by using clinical assessment, anthropometric measurements, dietary intakes, and biochemical indices. RESULTS: Although anthropometric measurements were not significantly different between alcoholic cirrhosis and viral cirrhosis, anthropometry of patients with viral cirrhosis had a higher tendency than that of alcoholic cirrhotic patients. Alcohol intake factors such as amount, duration, and frequency in alcoholic cirrhotic patients were higher than those in patients with viral cirrhosis. Energy excluding alcohol and vitamin C were significantly different between patients with alcoholic and viral cirrhosis. All subjects had lower intake of energy excluding alcohol, protein, vitamin A, thiamin, riboflavin, niacin, calcium, and iron as than recommended by the Recommended Dietary Allowances (RDA) for Koreans. Of special note was the fact that the intakes of energy excluding alcohol, vitamin A, riboflavin, and calcium were less than 75% of RDA for Koreans. Although the glucose and triglyceride levels were significantly different between alcoholic and viral cirrhotic patients, there were within normal range in both groups. There was an interaction effect in triceps skinfold thickness of the subjects according to both etiology and severity of liver disease. CONCLUSION: These data suggests that nutritional disorders are common in patients with both alcohol-and virus-related cirrhosis. It is necessary to educate patients with cirrhosis about the importance of a balanced dietary intake as well as its pattern, and quality of diet.
Alcoholics
;
Anthropometry
;
Ascorbic Acid
;
Calcium
;
Child
;
Diet
;
Fibrosis
;
Glucose
;
Humans
;
Iron
;
Liver Cirrhosis*
;
Liver Cirrhosis, Alcoholic
;
Liver Diseases
;
Liver*
;
Niacin
;
Nutrition Disorders
;
Nutritional Status*
;
Recommended Dietary Allowances
;
Reference Values
;
Riboflavin
;
Skinfold Thickness
;
Triglycerides
;
Vitamin A
3.Changes in Corneal Thickness in Congenital Glaucoma, Using Anterior Segment Optical Coherence Tomography
Chaeyeon LEE ; Eun Jung LEE ; Yoonkyung JANG ; Jong Chul HAN ; Chang Won KEE
Journal of the Korean Ophthalmological Society 2022;63(8):692-699
Purpose:
We examined corneal thickness, particularly morphological changes in the limbus, as the intraocular pressure increased in patients with congenital glaucoma.
Methods:
We retrospectively studied 31 children (47 eyes) with congenital glaucoma and 12 controls (12 eyes). We used anterior segment tomography to measure corneal thicknesses at the center, the midpoint of the 2-5 mm pericentral zone, the corneo-limbal junction, and the scleral spurs on the nasal and temporal sides. The peripheral central corneal thickness ratios were calculated and analyzed using a generalized estimation equation.
Results:
The cornea was significantly thinner in the glaucoma than in the control group. The difference was more prominent in the periphery than the center. Associated with such peripheral thinning, the corneal thickness ratios at the corneal-limbal junction and the center differed significantly between the two groups.
Conclusions
In congenital glaucoma patients, the cornea is generally thinner than that of the controls, particularly at the corneo-limbal junction, suggesting that the limbus is biomechanically susceptible to deformation by intraocular pressure.
4.The Brainstem Score on Diffusion-weighted Imaging before Mechanical Thrombectomy in Acute Basilar Artery Occlusion is a Reliable Predictor for Prognosis: A Comparative Study with Critical Area Perfusion Score on Perfusion MRI
Junho SEONG ; Kangwoo KIM ; Seungho LEE ; Yoonkyung LEE ; Byeol-A YOON ; Dae-Hyun KIM ; Jae-Kwan CHA
Journal of the Korean Neurological Association 2025;43(1):1-11
Background:
This study evaluated the use of brainstem score (BSS) on pre-procedural diffusion-weighted imaging (DWI) to predict outcomes after mechanical thrombectomy (MT) in acute basilar artery occlusion (ABAO) patients and compared its predictive effectiveness to the critical area perfusion score (CAPS) on perfusion magnetic resonance imaging (MRI) using RAPID.
Methods:
This study focused on ABAO patients who underwent MT after MRI at Dong-A University Hospital from 2013 to 2023. Ischemic lesion volume and DWI BSS were measured for all. For the group that underwent perfusion MRI using RAPID, CAPS were measured. The primary end point was a poor outcome at 90 days (modified Rankin scale [mRS], >2).
Results:
71 patients had ABAO and underwent MT after MRI. The poor outcome group (66.2%) had significantly larger ischemic lesion volume and higher DWI BSS compared with the good outcome group. In the multiple logistic regression analysis, DWI BSS (odds ratio, 8.27; 95% confidence interval, 1.93-35.50; p<0.01) was an independent predictor of poor outcomes. In 26 patients, CAPS was measured on perfusion MRI. In this subgroup, poor outcome group (50.0%) had higher DWI BSS and CAPS than the good outcome group. In the multiple logistic regression analysis, DWI BSS remained a valid independent predictor for predicting outcomes, but CAPS did not function as an independent predictor.
Conclusion
In this study, the DWI BSS before MT in ABAO patients emerged as a useful imaging marker for predicting post-procedural outcomes. Its predictive ability is not only comparable to but even superior to CAPS on perfusion MRI.
5.The Brainstem Score on Diffusion-weighted Imaging before Mechanical Thrombectomy in Acute Basilar Artery Occlusion is a Reliable Predictor for Prognosis: A Comparative Study with Critical Area Perfusion Score on Perfusion MRI
Junho SEONG ; Kangwoo KIM ; Seungho LEE ; Yoonkyung LEE ; Byeol-A YOON ; Dae-Hyun KIM ; Jae-Kwan CHA
Journal of the Korean Neurological Association 2025;43(1):1-11
Background:
This study evaluated the use of brainstem score (BSS) on pre-procedural diffusion-weighted imaging (DWI) to predict outcomes after mechanical thrombectomy (MT) in acute basilar artery occlusion (ABAO) patients and compared its predictive effectiveness to the critical area perfusion score (CAPS) on perfusion magnetic resonance imaging (MRI) using RAPID.
Methods:
This study focused on ABAO patients who underwent MT after MRI at Dong-A University Hospital from 2013 to 2023. Ischemic lesion volume and DWI BSS were measured for all. For the group that underwent perfusion MRI using RAPID, CAPS were measured. The primary end point was a poor outcome at 90 days (modified Rankin scale [mRS], >2).
Results:
71 patients had ABAO and underwent MT after MRI. The poor outcome group (66.2%) had significantly larger ischemic lesion volume and higher DWI BSS compared with the good outcome group. In the multiple logistic regression analysis, DWI BSS (odds ratio, 8.27; 95% confidence interval, 1.93-35.50; p<0.01) was an independent predictor of poor outcomes. In 26 patients, CAPS was measured on perfusion MRI. In this subgroup, poor outcome group (50.0%) had higher DWI BSS and CAPS than the good outcome group. In the multiple logistic regression analysis, DWI BSS remained a valid independent predictor for predicting outcomes, but CAPS did not function as an independent predictor.
Conclusion
In this study, the DWI BSS before MT in ABAO patients emerged as a useful imaging marker for predicting post-procedural outcomes. Its predictive ability is not only comparable to but even superior to CAPS on perfusion MRI.
6.The Brainstem Score on Diffusion-weighted Imaging before Mechanical Thrombectomy in Acute Basilar Artery Occlusion is a Reliable Predictor for Prognosis: A Comparative Study with Critical Area Perfusion Score on Perfusion MRI
Junho SEONG ; Kangwoo KIM ; Seungho LEE ; Yoonkyung LEE ; Byeol-A YOON ; Dae-Hyun KIM ; Jae-Kwan CHA
Journal of the Korean Neurological Association 2025;43(1):1-11
Background:
This study evaluated the use of brainstem score (BSS) on pre-procedural diffusion-weighted imaging (DWI) to predict outcomes after mechanical thrombectomy (MT) in acute basilar artery occlusion (ABAO) patients and compared its predictive effectiveness to the critical area perfusion score (CAPS) on perfusion magnetic resonance imaging (MRI) using RAPID.
Methods:
This study focused on ABAO patients who underwent MT after MRI at Dong-A University Hospital from 2013 to 2023. Ischemic lesion volume and DWI BSS were measured for all. For the group that underwent perfusion MRI using RAPID, CAPS were measured. The primary end point was a poor outcome at 90 days (modified Rankin scale [mRS], >2).
Results:
71 patients had ABAO and underwent MT after MRI. The poor outcome group (66.2%) had significantly larger ischemic lesion volume and higher DWI BSS compared with the good outcome group. In the multiple logistic regression analysis, DWI BSS (odds ratio, 8.27; 95% confidence interval, 1.93-35.50; p<0.01) was an independent predictor of poor outcomes. In 26 patients, CAPS was measured on perfusion MRI. In this subgroup, poor outcome group (50.0%) had higher DWI BSS and CAPS than the good outcome group. In the multiple logistic regression analysis, DWI BSS remained a valid independent predictor for predicting outcomes, but CAPS did not function as an independent predictor.
Conclusion
In this study, the DWI BSS before MT in ABAO patients emerged as a useful imaging marker for predicting post-procedural outcomes. Its predictive ability is not only comparable to but even superior to CAPS on perfusion MRI.
7.Factors Influencing Prognosis of Traumatized Tooth in Primary Tooth Intrusion
Yongkwon CHAE ; Yoonkyung HAN ; Okhyung NAM ; Misun KIM ; Hyoseol LEE ; Kwangchul KIM ; Sungchul CHOI
Journal of Korean Academy of Pediatric Dentistry 2019;46(1):29-37
The purpose of this study was to investigate the characteristics of intrusion in primary dentition and to evaluate factors influencing complications of primary and permanent dentition during long-term follow-up period.61 patients (84 teeth) were selected in this study. Medical records of 61 patients were reviewed and age, gender, cause of injury, site of injury, severity of traumatic injury, other injuries associated with trauma, treatment method, and complications of primary and permanent dentition were examined. Collected data were statistically evaluated using Chi-square test and Fisher's exact test.Intrusion in primary anterior teeth was predominant in boys over girls and fall was the most common cause of trauma. It was most common at home and occurred most in the primary maxillary central incisors. Severity had an effect on the incidence of sequelae in permanent successors (p = 0.014). The incidence of complications was significantly lower in patients with soft tissue injuries than in patients with other periodontal injuries (p = 0.000).
Dentition, Permanent
;
Female
;
Follow-Up Studies
;
Humans
;
Incidence
;
Incisor
;
Medical Records
;
Methods
;
Prognosis
;
Soft Tissue Injuries
;
Tooth Abnormalities
;
Tooth Injuries
;
Tooth
;
Tooth, Deciduous
8.Isolated Focal Cortical Infarction in a Patient with Churg-Strauss Syndrome.
Tae Kyung KIM ; Jee Eun LEE ; Eunjin KWON ; Chan Young LEE ; Min Young CHUN ; Yoonkyung CHANG ; Yong Jae KIM ; Tae Jin SONG
Journal of the Korean Neurological Association 2017;35(3):182-184
No abstract available.
Churg-Strauss Syndrome*
;
Humans
;
Infarction*
9.Recurrent Episodes of Rhabdomyolysis after Seizures in a Patient with Glycogen Storage Disease Type V.
Hyung Jun PARK ; Yoonkyung CHANG ; Jee Eun LEE ; Heasoo KOO ; Jeeyoung OH ; Young Chul CHOI ; Kee Duk PARK
Journal of Clinical Neurology 2016;12(3):373-375
No abstract available.
Glycogen Storage Disease Type V*
;
Glycogen Storage Disease*
;
Glycogen*
;
Humans
;
Rhabdomyolysis*
;
Seizures*
10.Characteristics for Ischemic Stroke in 18–30 Years Old Patients, Multicenter Stroke Registry Study.
Yoonkyung CHANG ; Tae Jin SONG ; Young Jae KIM ; Ji Hoe HEO ; Kyung Yul LEE ; Young Eun KIM ; Min Uk JANG ; Soo Jin CHO ; Suk Yun KANG
The Ewha Medical Journal 2017;40(3):128-135
OBJECTIVES: Although there have been several reports that described characteristics for young age stroke, information regarding very young age (18–30 years old) has been limited. We aimed to analyze demographic factors, stroke subtype, and 3-month outcome in acute ischemic stroke patient who have relatively very young age in multicenter stroke registry. METHODS: We evaluated all 122 (7.1%) consecutive acute ischemic stroke (within 7 days after symptom onset) patients aged 18 to 30 from 17,144 patients who registered in multicenter prospective stroke registry, 1997 to 2012. Etiology was classified by Trial of Org 10172 in Acute Stroke Treatment criteria. Stroke severity was defined as National Institutes of Health Stroke Scale (NIHSS) and stroke outcome was defined by modified Rankin scale (mRS) at 3 months after index stroke. RESULTS: The mean age of all included patients was 25.1±3.7 years and 76 patients (62.2%) were male. The median NIHSS at admission was 4. Considering stroke subtype, 37 patients (30.3%) had stroke of other determined etiology (SOD), 37 (30.3%) had undetermined negative evaluation (UN) and 31 (25.4%) had cardioembolism (CE) were frequently noted. After adjusting age, sex and variables which had P<0.1 in univariable analysis (NIHSS and stroke subtype), CE stroke subtype (odds ratio, 4.68; 95% confidence interval, 1.42–15.48; P=0.011) were significantly associated with poor functional outcome (mRS≥3). CONCLUSION: In very young age ischemic stroke patients, SOD and UN stroke subtype were most common and CE stroke subtype was independently associated with poor discharge outcome.
Carotid Artery, Internal, Dissection
;
Cerebral Infarction
;
Demography
;
Humans
;
Male
;
National Institutes of Health (U.S.)
;
Prognosis
;
Prospective Studies
;
Stroke*
;
United Nations
;
Vertebral Artery Dissection