In order to clarify the cause of intracellular ATP dependency on Zn2+ blockade of KATP channels in pancreatic beta cells, we investigated the KATP channel activity during external Zn2+ application using voltage clamp technique. Cultured beta cells were used for patch-clamp experiment. When 3 mM glucose was applied in bath, KATP channel activity was increased transiently by externally applied Zn2+ in the cell-attached mode and was recoverable. The KATP channel activity was, however, consistently increased by Zn2+ application during the 0 mM glucose in bath. Inside-out mode, internally applied Zn2+ elicited no response on the KATP channels. Another divalent cation, Mn2+, didn't have any effect on the KATP channels. Therefore, This effect, so-called external glucose-dependency on Zn2+ blockade of the KATP channels, might be due to intracellular Zn2+ metabolism which induces ATP consumption. This appears to be a mechanism that the Zn2+ blockade of the KATP channels in the pancreatic beta cells depends on the intracellular ATP concentration.
Adenosine Triphosphate* ; Baths ; Glucose ; Insulin-Secreting Cells* ; KATP Channels* ; Metabolism

BACKGROUND: Human high density lipoprotein (HDL) is known to stimulate endothelin-1 (ET-1) production through the phospholipase C (PLC)/Ca2+/ protein kinase C (PKC) pathway. Calcium channel blockers may be involved in the decrease of HDL- induced ET-1 production. This study was designed to evaluate whether HDL-induced ET-1 production was affected by Ca2+ channel blockers in cultured human proximal tubular cells (PTC). METHODS: The human PTC were obtained from human nephrectomized tissues, and cultured in six different media, which were bovine serum free (SF) DMEM/F12 medium alone, and five other SF DMEM/F12 media with 200 microgram/ml of HDL, with 200 microgram/ml of HDL and each 10 micrometer of diltiazem, nifedipine, and verapamil solved in 100% ethanol 0.1 volume%, and with 200 microgram/ml of HDL and 0.1 volume% of 100% ethanol as a control. After 24 hours of exposure, ET-1 in the supernatant was measured by radioimmunoassay, and ET-1 level in each well were marked as pg ET-1/mg cell protein/ 24 hr in consideration of cell count. RESULTS: In SF medium, ET-1 production was 1.803+/-0.295pg/mg cell protein/24 hr. In SF medium with 200 microgram/ml of HDL, ET-1 production significantly increased from 1.803+/-0.295 to 10.860+/-0.476 pg/mg cell protein/24 hr (P<0.05). In SF medium with 200 microgram/ml of HDL and 100% ethanol 0.1 volume%, ET-1 production significantly decreased from 10.860+/-0.476 to 6.700+/-1.273pg/mg cell protein/ 24 hr (P<0.05). In SF media with 200 microgram/ml of HDL and each 10 micrometer of diltiazem, nifedipine, and verapamil solved in 100% ethanol 0.1 volume%, ET- 1 production was decreased from 6.700+/-1.273 to 4.043+/-1.550 by diltiazem (P<0.05), to 3.260+/-0.752pg/ mg cell protein/24 hr by verapamil (P<0.05), and to 4.414+/-1.567pg/mg cell protein/24 hr by nifedipine (P=0.067). CONCLUSION: These results suggest that the HDL- induced ET-1 production in cultured human PTC was significantly decreased by diltiazem and verapamil, and it seemed to be decreased by nifedipine.
Calcium Channel Blockers* ; Calcium Channels* ; Calcium* ; Cell Count ; Diltiazem ; Endothelin-1* ; Ethanol ; Humans* ; Lipoproteins ; Nifedipine ; Protein Kinase C ; Radioimmunoassay ; Type C Phospholipases ; Verapamil

Clinical observations of 11 cases of acute pyogenic osteomyelitls and 14 cases of acute pyogenic arthritis in infancy during past 11 years were carried out and following results obtained. 1. The highest age incidence was less than 3 months after birth (70.6%). 2. Average duration of symptoms was 7.8 days. 3. The most important underlying cause was multiple femorai vessel puncture (23.5%). 4. The chief symptom or sign on admission was pseudoparalysis or limitation of motion (82.4%), and local swelling (82.4%). But high fever on admission was present in only 29.4% of cases. 5. The femur was the most common site in acute pyogenic osteomyelitis (36.4%), and the hip joint in acute pyogenic arthritis (42.9%). 6. Leucocyte count was Increased more than 20,000/mm in 60.0% of the cases. Erythrocyte sedimentation rate was increased more than 21 mm/hr in 72.0% of cases. The positive result on bacteriologic culture was 76.0%. Coagulase-positive Staphylococcus aureus was cultured in 4 cases of acute pyogenic osteomyelitis and 5 cases of acute pyogenic arthritls. a-hemolytic Streptococcus was cultured in 2 cases of acute pyogenic osteomyelitls and 1 case of acute pyogenic arthritis. Hemophilus influenzae was cultured in 1 case of acute pyogenic osteomyelitls and 2 cases of acute pyogenic arthritis. 7. 45.5% of acute pyogenic osteomyelitis was combined with acute pyogenic arthritis. 8. The longer the duration of symptoms was, the longer the abnormal hematologic picture lasted. Erythrocyte sedimentation rate was the most accurate index of activity in acute infection of bone and joint. 9. Shortening or deformity due to epiphyseal plate damage occured in 1 case of acute pyogenlc osteo-myelitis, and 3 cases of acute pyogenic arthritis. Those complications could be minimized wlth early diagnosis and treatment.
Arthritis ; Blood Sedimentation ; Congenital Abnormalities ; Early Diagnosis ; Femur ; Fever ; Growth Plate ; Haemophilus influenzae ; Hip Joint ; Incidence ; Joints ; Osteomyelitis ; Parturition ; Punctures ; Staphylococcus aureus ; Streptococcus

A case of giant hydronephrosis containing 9,500 cc, simulating ascites due to 'cirrhotic liver in a twenty. three year old male, is presented. The differential diagnosis and the important clinical, laboratory and X-ray features are discussed with brief literatual review.
Ascites ; Diagnosis, Differential ; Humans ; Hydronephrosis ; Liver ; Male

No abstract available.
Adult* ; Ductus Arteriosus, Patent* ; Humans

PURPOSE: Glutamate and aspartate are the excitatory amino acid neurotransmitters and NMDA (N-methyl-D-aspartate) is one of their major receptors. NMDA agonist may sti mulate serotonergic nervous system that inhibit the penile erection as well as induce the penile erection. We investigate the effects of NMDA agonist on serotonin release from hippocampus. MATERIALS AND METHODS: The slices of hippocampus were incubated in a buffer con taining 0.1mM [(3)H]5-hydroxytryptamine (5-HT) for uptake in the male rat. The release of 5-HT into the buffer during each 10 minutes period was measured and the radio activities in each buffer and the tissue were counted. After 50 min from the initiation, NMDA agonist were administered at 6th and 7th 10 min period respectively. The changes of 5-HT release were expressed as percent values compared to the 5th 10 min period. Tetrodotoxin was used to determine the possible involvement of interneuron on the action of these neurotransmitters. RESULTS: A steady release of 5-HT was observed up to 100 minutes after the rapid release during the first 40 minutes. Treatment of tetrodotoxin (10(-6)M) did not change the spontaneous release of 5-HT. The 5-HT released during 10 and 20 minutes of NMDA agonist (10(-4M)) treatment significantly higher than those of control group. The increase of 5-HT release by NMDA agonist was blocked by pretreatment with tetro dotoxin. The release of 5-HT was increased by NMDA agonist and this response was blocked by tetrodotoxin. CONCLUSIONS: NMDA agonist increases the release of 5-HT through the activation of the interneurons and these results suggest that NMDA agonist may stimulate the serotonergic nervous system that inhibit the penile erection as well as inducing the penile erection.
Animals ; Aspartic Acid ; Excitatory Amino Acids ; Glutamic Acid ; Hippocampus* ; Humans ; Interneurons ; Male ; N-Methylaspartate* ; Nervous System ; Neurotransmitter Agents ; Penile Erection ; Rats* ; Serotonin* ; Tetrodotoxin

No abstract available.
Infant ; Infant, Newborn ; Lissencephaly* ; Spasms, Infantile*

No abstract available.
Child* ; Humans ; Poisoning*

Squamous cell carcinoma is a malignant tumor arising from the epidermis or its appendages, Squamous cell carcinoma of extremity comprises approximately 1 to 2 percent of all squamous celi carcinoma and of these 0.2 to 1.7 percents are secondary to chronic osteomyelitis and 2 percents are secondary to the burn scar. We experienced 4 cases of squamous cell carcinoma invading bone directly, of these 2 cases are secondary to chronic osteomyelitis and 2 cases are secondary to the burn scar. With prompt and aggressive surgical treatment the prognosis is good. Routine regional lymphadenectomy is unnecessary because in most instances enlarged nodes are inflammatory and subside after amputation.
Amputation ; Burns ; Carcinoma, Squamous Cell ; Cicatrix ; Epidermis ; Epithelial Cells ; Extremities ; Lymph Node Excision ; Osteomyelitis ; Prognosis

No abstract available.
Anemia, Megaloblastic* ; Humans ; Megaloblasts* ; Methotrexate*