With rapid industrialization and urbanization, environmental pollution has become an urgent health problem. Asthma attack is a common and severe disease, and can be a sentinel event of worsening air pollution. There are, however, few studies about the epidemiolgy of asthma and the association between asthma and low level air pollution in Korea. This study was conducted to describe the trend and pattern of asthma attack and to examine the effect of air pollutants on admission in Korea. Combined data of this study are medical insurance claims for asthma, data from telemetry system of the Ministry of Environment for air pollutants, and air temperatures from monthly weather reports of the Meteorological Administration. To describe the temporal trends of asthma in Korea, insurance claims since 1985 were analized. Age specific asthma visit/admissions per 1000 eligible persons, as well as ratio of asthma visit/admissions over all visit/admissions showed a steady increase in asthma attack in Korea. Asthma prevalence was relatively high among under 5 years and over 50 years of age, and in these age groups asthma was more prevalent among males. The effects of relatively low level air pollution and weather condition on the number of patients who had asthma attacks admitted to hospitals in Seoul area were studied from April 2 to April 24, 1993. Asthma admissions were examined throughout the study period (392 cases), except sunday and holiday(354 cases) and except sunday, holiday and saturday (293 cases), while grouped into three age categories (3 12, over 40, and all age). Following results were obtained through correlation and multiple regression analysis. The number of adimission were significantly correlated with ambient air concentrations of total suspended particles (TSP), sulfur dioxide (SO2) and carbon monoxide(CO). 1) The number of admissions on the same day were significantly correlated with ambient air maximal concentrations of total suspended particcles among persons who were above 40 year old. 2) The effects of maximal daily concentrations of sulfer dioxide(SO2) among persons who were of 3- 12 age were significant when one day lagged asthma admission was compared with the air pollution on the previous day. 3) The number of admissions on 1-day lag were significantly correlated with ambient air maximal daily concentrations of carbon monoxide(CO) among persons who were above 40 year old. The associations between temperatures and number of admissions were not significant in this study. Levels of pollutants were fairly low, the monthly mean being 0.022 ppm for SO2, 0.032 ppm for NO2, 3.2 ppm for CO, 0.015 ppm for 03, and 240 micro gram/m3 for TSP. The mean temperature was 10.6degrees C. These results suggest that concentration of air pollutants lower than those given as guidelines may increase the incidence of asthma attacks.
Adult ; Air Pollutants ; Air Pollution* ; Asthma* ; Carbon ; Environmental Pollution ; Holidays ; Humans ; Incidence ; Insurance ; Korea* ; Male ; Prevalence ; Seoul ; Sulfur Dioxide ; Telemetry ; Urbanization ; Weather

Phospholipase D (PLD) activity is known to be related to oxidant-induced cellular signaling and membrane disturbance. Previously, an induction of PLD activity in various cell lines by X-ray irradiation was observed. In this study, we examined the effect of UVC radiation on the PLD activity in Vero 76 cells. At a dose of 10 kJ/m2 of UVC irradiation, the PLD activity was stimulated approximately 10-fold over the basal activity. This UVC-induced PLD activity was found to be dependent on the presence of extracellular calcium and was inhibited by catalase as well as amifostine-an intracellular thiol antioxidant. Pretreatments with Ro32-0432-a selective inhibitor of protein kinase C (PKC)-and downregulation of PKC by preincubation of phorbol 12-myristate 13-acetate significantly inhibited the UVC-induced PLD activity. UVC-stimulated PLD activity was observed only in murine PLD2 (mPLD2)-transfected Vero 76 cells and not in human PLD1 (hPLD1)-transfected cells. Transient incorporation of PKC with mPLD2 and the phosphorylation of mPLD2 by a and b forms of PKC by UVC irradiation were observed. These results suggest that the UVC-stimulated PLD activity in Vero 76 cells is mediated through transient phosphorylation of PLD2 by the translocation of PKC to PLD2.
Animals ; Antioxidants/metabolism ; Calcium/metabolism ; Cercopithecus aethiops ; Chelating Agents/pharmacology ; Enzyme Activation/radiation effects ; Mice ; Phospholipase D/genetics/*metabolism ; Protein Isoforms/genetics/metabolism ; Protein Kinase C/*metabolism ; Protein Kinase Inhibitors/pharmacology ; Reactive Oxygen Species ; Research Support, Non-U.S. Gov't ; Signal Transduction/*radiation effects ; *Ultraviolet Rays ; Vero Cells

PURPOSE: Phospholipase D (PLD) catalyzes the hydrolysis of phosphatidyl choline to phosphatidic acid (PA) and choline. Recently, PLD has been drawing much attentions and considered to be associated with cancer process since it is involved in cellular signal transduction. In this experiment, oleate-PLD activities were measured in various tissues of the living rats after whole body irradiation. MATERIAL AND METHODS: The reaction mixture for the PLD assay contained 0.1microCi 1,2-di[1-14C]palmitoyl phosphatidylcholine, 0.5mM phosphatidylcholine, 5mM sodium oleate, 0.2% taurodeoxycholate, 50mM HEPES buffer (pH 6.5), 10mM CaCl2, and 25mM KF. phosphatidic acid, the reaction product, was separated by TLC and its radioactivity was measured with a scintillation counter. The whole body irradiation was given to the female Wistar rats via Cobalt 60 Teletherapy with field size of 10cm x 10cm and an exposure of 2.7Gy per minute to the total doses of 10Gy and 25Gy. RESULTS: Among the tissues examined, PLD activity in lung was the highest one and was followed by kidney, skeletal muscle, brain, spleen, bone marrow, thymus, and liver. Upon irradiation, alteration of PLD activity was observed in thymus, spleen, lung, and bone marrow. Especially PLD activities of the spleen and thymus revealed the highest sensitivity toward gamma-ray with more than two times amplification in their activities. In contrast, the PLD activity of bone marrow appears to be reduced to nearly 30%. Irradiation effect was hardly detected in liver which showed the lowest PLD activity. CONCLUSION: The PLD activities affected most sensitively by the whole-body irradiation seem to be associated with organs involved in immunity and hematopoiesis. This observation strongly indicates that the PLD is closely related to the physiological function of these organs. Furthermore, radiation stress could offer an important means to explore the phenomena covering from cell proliferation to cell death on these organs.
Animals ; Attention ; Bone Marrow ; Brain ; Cell Death ; Cell Proliferation ; Choline ; Cobalt ; Female ; Hematopoiesis ; HEPES ; Humans ; Hydrolysis ; Kidney ; Liver ; Lung ; Muscle, Skeletal ; Oleic Acid ; Phosphatidic Acids ; Phosphatidylcholines ; Phospholipase D* ; Phospholipases* ; Radiation Effects ; Radioactivity ; Rats* ; Rats, Wistar ; Scintillation Counting ; Signal Transduction ; Sodium ; Spleen ; Taurodeoxycholic Acid ; Thymus Gland ; Whole-Body Irradiation

PURPOSE: Phospholipase D (PLD) catalyzes the hydrolytic cleavage of terminal phosphate diester bond of glycerophopholipids to produce phosphatidic acid (PA). PLD plays an important role in signal transduction and is known to be involved closely in cancer promotion, inflammation, and other cell responses. In order to evaluate radiation effect in tumor cells, various cells were screened for PLD activities and examined their radiation effects on PLD following gamma- ray irradiation. MATERIALS AND METHODS: PLD activities in 19 species of cell were measured by radioactive isotope method with 1,2 - di [1-14C] phosphatidylcholine in the presence of oleate. Among the cell lines examined, VERO 76, L 1210 and P 388 were selected and examined for their effects of metal ions and agonists on PLD activities before and after irradiation by Co-60 teletheraphy unit. RESULTS: The activities of oleate-PLD were observed in 11 species among 19 cell lines examined. VERO 76 and L 1210 cells showed that the PLD activity increased immediately after irradiation and reached to 150~200% of the control levels. The activation of PLD in response to gamma-ray was maximum at 20 Gy. In irradiated VERO 76, the stimulatory effect of Mg2+ was reduced and the activation of PLD by agonists in irradiated cells vary from those of the control cells. CONCLUSION: The activation effect of irradiation on PLD activity observed strongly implies that the PLD activity is closely related to the phenomena of cell necrosis. Therefore the cell lines examined here could provide a good source for the study of radiobiology that cover from cell death to cancer promotion.
Cell Death ; Cell Line* ; Inflammation ; Ions ; Necrosis ; Oleic Acid ; Phosphatidic Acids ; Phosphatidylcholines ; Phospholipase D ; Radiation Effects ; Radiobiology ; Signal Transduction

In order to evalute the effects of radiation on mammalian neuronal system, we have examined the effect of gamma-ray radiation on the monoamine oxidase(MAO) activity in monoaminergic neurons. Following the whole body irradiation, MAO activity in the rat brain was measured as well as in the liver for the comparative studies between the neuronal and nonneuronal system. The effects of some radiation protectors and sensitizers were also examined in addition to the O2 effect. The results can be summarized as follows. 1) The MAO activity of rat brain was minimally affected by the radiation dose up to 1,700 cGy. Radiation dose above 2,500 cGy inhibited the brain MAO activity by no less than 10%. MAO-A form was found to be particularly sensitive to radiation. The liver MAO was somewhat inhibited(by about 5%) but hard1y dependent on the dose of radiation. 2) The inhibitory effect on the brain was initiated immediately by the radiation dose of 2,500 cGy. On the contrary, for the liver, the inhibitory effect became apparent only 2 days after irradiation. 3) Two days after a dose of 2,500 cGy, Vmax and Km of the brain mitochondrial MAO decreased. for liver, Vmax decreased while Km increased, which indicates the kinetic patterns for the neuronal and nonneruronal systems are not affected similarly by radiation. 4) The effect of several known radiation protectors and sensitizers on MAO activity was tested but no definite results were obtained. The level of -SH group increased in some degree upon radiation but not by the compounds. 5) MAO activity was not affected by O2 concentration, while an elevated level of lipid peroxidase was found udder the same condition. The results described here indicate that characteristics of MAO, one of the most important central nervous system enzymes, are liable to radiation, which is partially differentiated from the liver MAO. Also indicated are that the -SH groups are hardly related to the effect of radiation but the production of the lipid peroxide seems to be somewhat correlated to the effect of radiation.
Animals ; Brain* ; Central Nervous System ; Liver* ; Mammary Glands, Animal ; Monoamine Oxidase* ; Neurons ; Peroxidase ; Rats* ; Whole-Body Irradiation

Recently, brainstem auditory evoked potential is very important for the evaluation of functions of the 8th nerve & brainstem. Especially, it appears that waves I, III, and V primarily represent volume- conducted electrical activity from the acoustic nerve, pons and midbrain, respectively, and that latencies between these three potentials indirectly reflect neural conduction in the corresponding segments of the central auditory pathway. For example, wave I to wave III interpeak latency(I-III IPL) is a measure of conduction in the more caudal segment of the brainstem auditory pathway-acoustic nerve and potomedullary portion-while the III-V IPL is a measure of conduction in the more rostral pontine and midbrain portions of the pathway. This study was undertaken to identify the normal measurements of the waves I, III and V and I-III IPL, III-V IPL in order to for provide basic data for clinical use in diagnosis, monitering in operation and management of patients with brainstem lesions. The literature is reviewed and results compared to the current study.
Auditory Pathways ; Brain Stem* ; Cochlear Nerve ; Diagnosis ; Evoked Potentials, Auditory, Brain Stem* ; Humans ; Mesencephalon ; Neural Conduction ; Pons

Recently for 2 years, 24 cases of microabscesses have been experienced and treated at St. Paul's Hospital, Catholic Medical College. Investigations had been made & analyzed to characteristic clinical symptoms and signs, typical CT findings and therapeutic management and prognosis. The CT scan is most choice of and early and accurate diagnosis and has made feasible the follow up of the evolution and eventual resolution of abscess lesions. In the authors opinion and experience, when microabscess is diagnosed at it early stage, it could be treated in 2week with the administration of antibiotics & not need any other surgical interventions.
Abscess ; Anti-Bacterial Agents ; Diagnosis* ; Follow-Up Studies ; Prognosis ; Tomography, X-Ray Computed

Recently microvascular decompressive approach to the hyperactive type of low cranial nerves dysfunction has been popular procedures in neurosurgical operation. The neurosurgical teams at St. Paul's Hospital, Catholic Medical College operated on 11 patients employing this technique for 2 years. The patients were diagnosed as 9 patients with hemifacial spasm, one with trigeminal neuralgia, and one with glossopharyngeal neuralgia. The results were very encouraging of the 10 patients. But remaining one patient was failed with therapy. The authors would like to share with you their experiences employing the microvascular surgical technique, the results & the prognosis.
Cranial Nerves* ; Glossopharyngeal Nerve Diseases ; Hemifacial Spasm ; Humans ; Microvascular Decompression Surgery ; Prognosis ; Trigeminal Neuralgia

No abstract available.

The cause of so-called lumbar disc syndrome are multiple and each cause must be throughly and carefully investigated. The proper treatment may not be successful if one of these factors is ignored. Forty patients with lumbar disc syndrome were examined with a third generation CT scanner(Somatom II) and SEP for 12 months. The findings of CT scan were characterized according to the criteria suggested by Carrera and Hermanus and all results were analized thoroughly. The aim of this article is to underline the importance of the correlative studies between spinal CT and SEP in relation to lumbar disc syndrome.
Humans ; Tomography, X-Ray Computed*