PURPOSE: The aquaporins (AQPs) are transmembrane water channel proteins. It is well known that AQP2, -3 and -4 contribute to the urinary concentration in collecting duct (CD) and also reported the presence of these three AQPs in the connecting tubule (CNT). Newborn rats are not capable of producing a concentrated urine. Rats develop the ability to concentrate urine after birth. The purpose of this study was to establish the time of the expression and the distribution of AQP2, -3 and -4 in the developing rat kidney. MATERIALS AND METHODS: Sprague-Dawley rats were used in all experiments. Kidneys were obtained from 16, 18 and 20-day-old fetuses and 1, 4, 7, 14 and 21-day-old pups and preserved and processed for immunohistochemical studies using a preembedding immunoperoxidase procedure. AQP2, -3 and -4 immunoreactivity was detected using rabbit polyclonal antibody and donkey anti-rabbit IgG. RESULTS: AQP2, -3 and -4 appeared first in 16-day-old fetuses in the CD and in 18-day-old fetuses in the CNT. Immunoreactivity for AQP2, -3 and -4 was markedly increased after birth and gradually increased during development. In CNT cells and principal cells, AQP2, -3 and -4 were not distinctly demonstrated on the apical, lateral and basal plasma membrane respectively until 21 days after birth. Distinct polarity of these AQPs both in CNTcells and principal cells were observed at 21 days after birth. CONCLUSIONS: AQP2 -3, and -4 were expressed not only in CD but also in CNT before developing of urine concentrating ability during development and it is concluded that their expression and distribution in CNT may play a role in the development of urine concentration abilities in rat kidney.
Animals ; Aquaporin 2* ; Aquaporins ; Attention ; Cell Membrane ; Equidae ; Fetus ; Humans ; Immunoglobulin G ; Infant, Newborn ; Kidney Concentrating Ability ; Kidney Tubules ; Kidney* ; Parturition ; Rats* ; Rats, Sprague-Dawley

No abstract available.
Methicillin Resistance* ; Methicillin-Resistant Staphylococcus aureus*

In order to elucidate the possibility of diagnosis in soft tissue cysticercosis in case no parasite in it, immunohistochemical staining with antihuman IgG, IgM, and IgA and anticysticercus antibody in tissue section were carried out. Not only the differential counts of infiltrated plasma cells but also the parasite itself against to the anticysticercus antibody were observed. Materials stained immunohistochemically were consisted of 21 soft tissue cysticercosis with or without parasite. The results were as follows: 1) IgG producing plasma cells were most frequent (45.8+/-18.7) and followed by IgM (14.3+/-0.43) and (4.3+/-5.71). Number of IgG plasma cells were more frequently accompanied in the presence of cysticercus (55.9+/-17.7) than in the absence of parasite (39.7+/-17.1). 2) The mean+/-S.D. of plasma cells positive to the anticysticercus antibody were 28.2+/-18.7. And anticysticercus antibody producing plasma cells were more frequent in the presence of cysticercus (49.2+/-5.16) than in the absence of parasite (15.2+/-9.46). 3) Antigenicity of the cysticercus was strong in inner layer(#) followed by tegument(+) and fibrous layer(-). 4) Therefore, it could be suggested that antibody against to the cysticercus is mainly produced by IgG plasma cells and antigenicity of the worm is strong in the inner layer of cyst wall. In addition, there is a possibility of assisting the diagnosis of cysticercosis with anticysticercus antibody by immunohistochemically.
Cysts

It has been increasingly clear that the defence against Mycobacterium leprae(M. leprae) appears mainly to depend on cell-mediated rather than humoral immune mechanism. Nevertheless, the M. leprae is not only capable of producing specific humoral antibody, but also stimulating the formation of a variety of autoantibodies, since mycobacteria are known to exert adjuvant effect. Although the exact role of the autoantibodies in the pathogenesis of leprosy is not known, it is remarkable that the prevalence of autoantibodies has been reported different by several investigators, suggesting the possibility of geographical or racial difference. This study was undertaken to investigate the prevalence of some autoantibodies in Korean patients with leprosy. Eighty patients with leprosy registered at the Department of Dermatology, Seoul National University Hospital entered this study from February, 1977 through October, 1978, The diagnosis was made by clinical, histological, bacteriological and immunological assessments and the patients were classified according to the Ridley-Jopling scale. All patients were under anti leprosy chemotherapy with DDS (Diaminodiphenylsulfone) for various periods at the time of study. Venereal Disease Research Laboratory (VDRL) test was performed in 80 patients and the sera displaying reactive VDRL were subjected to re-examination by Treponema Pallidum Hemagglutinin Assay (TPHA). Rbeumatoid factor was sought by means of latex fixation test in 66 patients. Antinuclear antibody (ANA) was detected by means of latex agglutination reaction in 61 patients using polysterene latex complexed with calf thymus deoxyribonucleoprotein. Cryoprotein was detected as described elsewhere. Four of the 80 patients(5%) showed reactive VDRL, while rheumatoid factor and antinuclear antibody were not detectable in all cases. Cryoprotein was detected in 15 patients (27. 3 %). Compared with other reports on the prevalence of autoantibodies in Caucacian and African patients, we found a much lower frequency. This result may be expained partly by the racial or geographic difference in the pattern of leprosy as suggeste4 by Turk.
Agglutination ; Antibodies, Antinuclear ; Autoantibodies* ; Dermatology ; Diagnosis ; Drug Therapy ; Hemagglutinins ; Humans ; Latex ; Latex Fixation Tests ; Leprosy* ; Mycobacterium ; Prevalence* ; Research Personnel ; Rheumatoid Factor ; Seoul ; Sexually Transmitted Diseases ; Thymus Gland ; Treponema pallidum

No abstract available.

Dermatologist should be aware of the practical importance of proper selection of ski.n lesions for histologic examination, the correct methods for performing biopsy, and steps involved in tissue preparation. They should be acquainted with factors producing various artifacts and ways to prevent these changes. This study was undertaken to investigate the artifacts of 300 dermatopathologic tissue sections which prepared by 3 general hospitals in Seoul in 1983. The results were summarized as follows. [.The percentage of artifacts produced by selection of inapropriate lesion was 4. 0% artifacts during biopsy procedure was 18. 3% inadequate size and depth of specimen was 7. 3%, faulty embedding was 12. 0%, tissue tearing or loss was 49. 3% artifactal dermoepidermal separation was 3.0%, linear knife marking was 17.0% thick or thin section was 8. 3% tissue overlapping was 12. 0% uneven stiining or precipitation was 3. 7%, and foreign body contamination was 3, 7% The percentage of good specimen was 21, 7% diagnostic was 56. 3% not diagnostic but suggestive was 8.7% and reading impossible was 13. 3% 3. The major causes of reading impossible specimen which attributed to the procedures of dermatologist were 40.0% to the proccss of technician were 47.5% and to both were 12. 5%
Artifacts* ; Biopsy* ; Foreign Bodies ; Hospitals, General ; Seoul ; Skin*

No abstract available.
Bile*

No abstract available.
DNA*

A survey on the prevalence of intestinal parasites was performed during the period from April to June of 1969, to evaluate the present status of parasitic infections in ROK Army soldiers. Stool specimens of 1,0l2 soldiers were collected from a camp located in Won-Ju area, and examined by the method of formalin-ether sedimentation technique. For protozoan cysts, examined slide was stained with Lugol's iodine solution and for eggs of Enterobius, the Graham's scotch cellulose tape anal swab technique was applied. The results obtained in this survey were as follows: Of the 1,012 soldiers examined, 95.0 percent were found infected by one or more intestinal parasites and 28.7 percent were found positive for protozoan cysts. The positive rates of each parasites were; A. lumbricoides 61.0 percent, T. trichiurus 73.4 percent, hookworm 17.5 percent, T. orientalis 9.5 percent, E. vermicularis 0.1 percent (from stool specimen), C. sinensis 8.8 percent, M. yokogawai 1.1 percent, Taenia sp. 1.0 percent (from stool), H. nana 0.3 percent and E. histolytica 7.4 percent. E. coli 12.6 percent, E. nana 5.9 percent, I. buetchlii 0.7 pecent, G. lamblia 6.1 percent, and C. mesnili 0.8 percent. From the anal swabs, eggs of Enterobius were recovered in 2.6 percent, and eggs of Taenia sp. showed positive rate of 1.5 percent.
parasitology-helminth-trematoda-nematoda-cestoda-protozoa ; epidemiology ; Ascaris lumbricoides ; Trichuris trichiurus ; hookworm ; Trichostrogylus orientalis ; Enterobius vermicularis ; Clonorchis sinensis ; Metagonimus yokogawai ; Taenia sp. ; Hymenolepis nana ; Entamoeba histolytica ; Entamoeba coli ; Endolimax nana ; Iodamoeba buetchlii ; Giardia lamblia ; Chilomastix mesnili

PURPOSE: Endothelin-1(ET-1) is a potent vasoconstrictor peptide. It has potent contractile and proliferative effects on vascular smooth muscle cells. Congenital heart diseases are often accompanied by pulmonary hypertension, and the severity of pulmonary hypertension is important in the prognosis. The aim of this study was to elucidate changes of ET-1 after pulmonary venous stenosis in a dog model, and investigate the interaction between pulmonary venous pressure and ET-1. METHODS: Plasma ET-1 levels were measured by radioimmuno-assay at the thoracic aorta, left pulmonary artery and left pulmonary vein. Pressures were also monitored at the same sites. Immunohistochemical staining of ET-1 was performed in the lung tissue. RESULTS: Increased serum ET-1 levels were noted at 1 hour after left pulmonary vein stenosis in the left pulmonary vein and aorta, and at 2 days after stenosis in the left pulmonary artery. Left pulmonary venous pressure was significantly increased at 1 hour after pulmonary vein stenosis, and systolic pulmonary artery pressure at 2 days after stenosis. Increased expression of ET-1 was noted by immunohistochemical staining at the lung tissue at 7 days after stenosis of left pulmonary vein. CONCLUSION: Increased serum ET-1 level and expression of ET-1 in immunohistochemical staining at lung tissue were noted after stenosis of pulmonary vein. Serum ET-1 level would be useful in the diagnosis and prediction of pulmonary artery hypertension. (J Korean Pediatr Soc 2000;43:769 778)
Animals ; Aorta ; Aorta, Thoracic ; Constriction, Pathologic* ; Diagnosis ; Dogs ; Endothelin-1* ; Endothelins ; Heart Diseases ; Hypertension ; Hypertension, Pulmonary ; Lung ; Muscle, Smooth, Vascular ; Plasma ; Prognosis ; Pulmonary Artery ; Pulmonary Veins ; Venous Pressure