PURPOSE: The purpose of this study was to ascertain whether radiation adaptive response could be induced by Tc-99m-methylene diphosphonate (Tc-99m-MDP) in peripheral lymphocytes of patients undergoing bone scintigraphy. MATERIALS AND METHODS: Lymphocytes from 22 patients (6 males, 16 females, mean age 50+/-14 years) were collected before and after bone scintigraphy using 740 MBq Tc-99m-MDP. Lymphocytes from 10 controls (6 males, 4 females, mean age 43+/-7 years) were also collected. They were exposed challenge dose of 2 Gy gamma rays using a cell irradiator Number of ring-form and dicentric chromosomal per 600 cells (chromosomal aberrations) was counted under the light microscope. RESULTS: Chromosomal aberrations in patients before bone scintigraphy (385.1+/-30.5) was not different from that of controls (367.8+/-36.6). However, chromosomal aberrations in patients after bone scintigraphy was significantly decreased 192.6+/-22.1 (p=0.0001). CONCLUSION: Low dose gamma-irradiation by Tc-99m-MDP used for bone scintigraphy induces a cytogenetic adaptive response in peripheral lymphocytes.
Chromosome Aberrations ; Cytogenetics ; Female ; Gamma Rays ; Humans ; Lymphocytes* ; Male ; Radionuclide Imaging* ; Technetium Tc 99m Medronate

PURPOSE: The purpose of this study was to evaluate the relationship between radiation-induced activation of DNA repair genes and radiation induced apoptosis in A431 cell line. MATERALS AND METHODS: Five and 25 Gys of gamma radiation were given to A431 cells by a Cs-137 cell irradiator. Apoptosis was evaluated by flow cytometry using annexin V-fluorescein isothiocyanate and propidium iodide staining. The expression of DNA repair genes was evaluated by both Northern and Western blot analyses. RESULTS: The number of apoptotic cells increased with the increased radiation dose. It increased most significantly at 12 hours after irradiation. Expression of p53, p21, and hRAD50 reached the highest level at 12 hours after 5 Gy irradiation. In response to 25 Gy irradiation, hRAD50 and p21 were expressed maximally at 12 hours, but p53 and GADD45 genes showed the highest expression level after 12 hours. CONCLUSION: Induction of apoptosis and DNA repair by ionizing radiation were closely correlated. The peak time of inducing apoptosis and DNA repair was 12 hours in this study model. hRAD50, a recently discovered DNA repair gene, was also associated with radiation-induced apoptosis.
Apoptosis* ; Blotting, Western ; Cell Line* ; DNA Repair* ; DNA* ; Flow Cytometry ; Gamma Rays ; Humans* ; Propidium ; Radiation, Ionizing

OBJECTIVES: It has been constantly reported that mismatch negativity (MMN) is impaired in patients with schizophrenia. However, the mechanism which relates impaired MMN and schizophrenia is not clear yet. The aim of this study is to investigate the association between MMN and clinical variables including functional status in patients with schizophrenia. METHODS: The present study assessed MMN using passive auditory oddball task in 26 patients with schizophrenia and 48 healthy controls. Repeated measures Analysis of Variance with age as a covariate was carried out for comparing peak amplitude and latency of MMN at 8 central line electrodes (FPz, Fz, FCz, Cz, CPz, Pz, POz, Oz) across groups. Pearson's correlation was performed to reveal the relationship between MMN and clinical variables including neurocognitive test results and the Global Assessment of Functioning score. RESULTS: MMN amplitude was significantly reduced in patients with schizophrenia compared with healthy controls. Pearson's correlation showed that subsets of short form of Korean Wechsler Adult Intelligence Scale scores and GAF scores were associated with MMN amplitude in patients with schizophrenia. CONCLUSION: These findings suggest that MMN amplitude is associated with current functional status including cognitive function in patients with schizophrenia.
Adult ; Analysis of Variance ; Electrodes ; Humans ; Intelligence ; Schizophrenia*

A 11-year-old, female Russian Blue cat was presented with anorexia, vomiting, and diarrhea lasting for 3 days. Abdominal ultrasonography revealed a hypoechoic, non-circumferential, and eccentrically formed intestinal loop with altered wall layering and thickening of the tunica muscularis. After surgical resection, histopathologic examination confirmed an infiltrative, round-cell neoplasm composed of sheets and cords of neoplastic mast cells within a fibrotic, edematous stroma. The cat was alive and healthy 6 months after surgery. To the best of our knowledge, this is the first reported case of an intestinal mast cell tumor in a Russian Blue cat in South Korea.
Animals ; Anorexia ; Cats* ; Child ; Diarrhea ; Female ; Humans ; Korea ; Mast Cells* ; Ultrasonography ; Vomiting

No abstract available.
Haemophilus influenzae* ; Haemophilus*

No abstract available.
Nipples*

PURPOSE: The purpose of this study was to compare the radiation adaptive response (RAR) in peripheral lymphocytes (PL) of patients induced by Tc.-99m MDP and Tc-99m DTPA scintigraphies. MATERIALS AND METHODS: Lymphocytes from 45 patients (25 males, 20 females, mean age 44+/-18 years) were collected before and after scintigraphies using 740 MBq Tc-99m MDP (n=22) or Tc-99m L)TPA (n=23). Lympho-cytes from 20 controls (12 males, 8 females, mean age 43+/-7 years) were also callected. They were exposed to challenge dose of 2 Gy gamma-rays using a Cs-137 cell irradiator, Number of ring-form (R) and dicentric (D) chromosomes was counted under the light microscope. From them a representative score, Ydr, was calculated as Ydr=(D+R)/cells. Adaptation index (AI) was defined as difference of Ydr between unconditioned and conditioned lymphocytes. Ydr was also measured after an administration of cyclohexi-mide (CHM), a protein synthesis inhibitor, before challenge dose. RESULTS: RAR was induced in both groups of patients. CHM abolished the adaptive response in both groups. AI of Tc-99m MDP group was significantly higher than that of Tc-99m DTPA group. CONCLUSION: Tc-99m MDP induced RAR was more prominent than those induced by Tc-99m DTPA.
Chromosome Aberrations ; Female ; Humans ; Lymphocytes* ; Male ; Pentetic Acid* ; Technetium Tc 99m Medronate*

No abstract available.
Urinary Tract Infections* ; Urinary Tract*

No abstract available.
Diagnosis* ; Heart Failure* ; Heart Septal Defects, Ventricular ; Heart*

BACKGROUND: The prostaglandin E1(PGE1) is a well known protent dilator of arteriosus. Maintaining of the patency of ductus arteriosus is crucial for the survival of patients suffering from ductus-dependent cyanotic congenital heart disease. We aimed to analyse the efficacy and the influencing factors upon PGE1 in patients suffering from this disease. METHODS: Between May 1991 and April 1993, 26 neonates and infants with ductus- dependent cyanotic congenital heart disease received on intravenous infusion of PGE1 in the Division of Pediatric Cardiology. Yonsei Cardiovascular Center. The result was a dramatic improvement in systemic arterial oxygen tension and oxygen saturation during infusion of PGE1with a dependency on the infusion of PGE1. We evaluated the arterial blood gas analysis both at the immediate pre-infusion stage and 2 hours after infusion. We aimed to analyse the factors which may influence the intravenous of PGE1to infant suffers of ducts-dependent cyanotic congenital heart disease, such as pulmonary atresia(n=14), severe pulmonary stenosis(n=7) or complete transposition of the great arteries(n=5). RESULTS: 1) There was a significant increase in PaO2 and Oxygen saturation 2 hours after the infusion of PGE1. This appeared to be unrelated to the different forms of the disease when compared with the pre-infusion values. 2) The infants' responsiveness of the ductus arteriosus appeared to be age related with significant differences emerging between the 2 group(p<.05). In infants younger than 9 hours old, the differences in PaO2 changes between pre-infusion and post-infusion of PGE1 were 16.3+/-3.7mmHg compared to just 10.4+/-0.4mmHg in infants older than 96 hours. 3) No significant difference emerged between an increase in PaO2or oxygen saturation relating to the shape of ductus arteriosus ; or the level of PaO2prior to the infusion. 4) The side effects of PGE1were as follows ; fever(84.6%),loose stool(61.5%), apnea(30.8%) and hypotension(15.4%), etc.. CONCLUSION: PGE1provides excellent medical palliation for infants suffering from ductus-dependent cyanotic congenital heart disease until the pulmonary arteries are large enough for a modified Blalock-Taussig shunt ; or until corrective surgery is possible.
Alprostadil ; Blalock-Taussig Procedure ; Blood Gas Analysis ; Cardiology ; Ductus Arteriosus ; Heart Defects, Congenital* ; Humans ; Infant* ; Infant, Newborn ; Infusions, Intravenous ; Oxygen ; Pulmonary Artery