In order to investigate the neurotoxic effect of methylmercury (MM) on cultured mouse spinal motoneuron cell line, NSC-19, neurotoxic effect of MM was evaluated by MTT assay after neurons were incubated with various concentrations of methylmercuric chloride (MMC) for 24 hours. In addition, neuroprotective effect of vitamin E against MMC-induced neurotoxicity was examined by MTT assay and neurofilament enzymeimmunoassay (EIA) in these cultures. The results were as follows : 1. MTT50 value was a concentration of 20µM methylmercuric chloride. 2. Methylmercuric chloride was toxic on cultured spinal motor neurons, NSC-19 cells in a time-and dose-dependent manner by severe decrease of cell viability. 3. Methylmercuric chloride induced the decrease of cell number and the loss of neuritis on these cultures. 4. Vitamin E remarkably increased the viabilily of cultured neurons damaged by methylmercury-induced neurotoxicity at a concentration of 250µM vitamin E. From above the results, it is suggested that methylmercury induces severe toxic effect on cultured mouse spinal motor neurons, NSC-19 cells, and the selective antioxidants such as vitamin E are effective in the neurotoxicity induced by methylmercury in these cultures.
Animals ; Antioxidants ; Cell Count ; Cell Culture Techniques ; Cell Line ; Cell Survival ; Intermediate Filaments ; Mice ; Motor Neurons* ; Neuritis ; Neurons ; Neuroprotective Agents ; Vitamin E* ; Vitamins*

To evaluate the effect of midkine (MK), neurotrophic factor on cultured mouse spinal motor neuron, NSC-19 which was inhibited by glucose oxidase (GO)-induced oxygen radicals, MTT assay and neurofilament enzymeimmunoassay were carried out after NSC-19 cells were preincubated with various concentrations of midkine for 2 hours prior to exposure of glucose oxidase. The results were as follows : 1. MK increased the rate of cell viability and neurofilamental development in a dose-dependent manner on motoneurons inhibited by glucose oxidase-induced oxygen radicals. 2. MTT50 value was 25 mU/ml GO. 3. GO-induced oxygen radicals were toxic on cultured motor neurons in a time and dose-dependent manner. 4. GO-induced oxygen radicals induced the decrease of cells in number and the loss of neurites in cultured mouse spinal motor neurons. From above the results, it is concluded that oxygen radicals are toxic in cultured mouse spinal motor neurons, and selective neurotrophic factors such as MK enhance the viability of motor neurons inhibited by oxygen radicals.
Animals ; Cell Survival ; Glucose ; Glucose Oxidase ; Intermediate Filaments ; Mice ; Motor Neurons* ; Nerve Growth Factor ; Nerve Growth Factors ; Neurites ; Oxidative Stress* ; Reactive Oxygen Species

To elucidate the neurotoxic mechanism of methylmercury on cultured bovine oligodendrocytes, neurotoxic effect was estimated by MTT assay after cultures were exposed to various concentrations of methylmercuric chloride (MMC). In addition, neuroprotective effect of antioxidant, allopurinol agonist MMC-induced neurotoxicity was examined on these cultures. Exposure of cultured bovine oligodendrocytes to MMC showed less than 50% of the cell viability 24 hours after treatment with 35µM of MMC. And also, allopurinol blocked the neurotoxicity induced by MMC on these cultures. These results suggest that oxygen radicals involve in MMC-mediated neurotoxicity, and also seletive antioxidants such as allopurinol are effective in blocking the neurotoxicity induced by MMC on cultured bovine oligodendrocytes.
Allopurinol* ; Antioxidants ; Cell Survival ; Neuroprotective Agents ; Oligodendroglia ; Reactive Oxygen Species

No abstract available.
HLA-A2 Antigen* ; Isoelectric Focusing*

No abstract available.
Animals ; Fibroblasts* ; Fluorouracil* ; Rats*

No abstract available.
Alleles* ; Gene Frequency* ; HLA-DR Antigens* ; Polymerase Chain Reaction*

No abstract available.
Animals ; Liver* ; Metals, Heavy* ; Rats*

In order to examine the neurotoxic mechanism of oxygen radicals on cultured bovine oligodendrocytes, cytoxic effect of oxygen radicals was examined when cultures were treated with various concentrations of xanthine oxidase (XO) and hypoxanthine (HX) in culture medium. In addition, the neuroprotective effect of iron-chelators against the neurotoxicity induced by oxygen radicals was evaluated by MTT assay. Cell viability was remarkably decreased in a time-dependent manner after exposure of cultured bovine oligodendrocytes to 20mU/ml XO and 0.1mM HX for 4 hours. In the neuroprotective effect of iron-chelators on oxidant-induced neurotoxicity, tetrakis (2-pyridylmethyl)ethylenediamine (TPEN) blocked the neurotoxicity induced by oxygen radicals, while DFX was not effective in blocking oxidant-induced neurotoxicity in these cultures. These results suggest that oxygen radicals are toxic in cultured bovine oligodendrocytes, and also selective iron-chelators such as TPEN are effective in blocking the neurotoxicity induced by oxygen radicals.
Allopurinol* ; Cell Survival ; Hypoxanthine ; Neuroprotective Agents ; Oligodendroglia ; Reactive Oxygen Species ; Xanthine Oxidase

No abstract available.
DNA* ; HLA-DR Antigens* ; Polymerase Chain Reaction*

The enzymatic complex 3beta-hydroxysteroid dehydrogenase Delta5-Delta4 isomerase(3beta-HSD) catalyzes the obligatory oxidation and isomerization of Delta4-hydroxypregnene and Delta5-hydroxyandrostene steroid precursors into Delta4-ketosteroid necessary for the formation of all classes of steroid hormones such as glucocorticoid, mineralocorticoid, progesterone, androgen and estrogen. The 3beta-HSD enzymatic activity is present at the syncytiotrophoblast, the sebaceous gland of the skin, the Leydig cells of the testis, the thecal cells and granulosa lutein cells ofthe ovary in human. So we thought that 3beta-HSD antibody can be used to diagnose several steroidogenic tumors in human, but there has been few trial for it. In this study, we made polyclonal antibody against human placental 3beta-HSD. And then immunohistochemical studies with the antibody were performed to diagnose several kinds of steroidogenic tumors in human. The polyclonal antibody detected specifically the placental protein of 43 KDa by Western blotting. And the polyclonal antibody reacted on the syncytiotrophoblast, the sebaceous gland of the skin, the Leydig cells of the testis, adrenal cortex, the thecal cells and granulosa lutein cells of the ovary with immunohistochemical staining. In immunohistochemical staining, the polyclonal antibody against 3beta-HSD reacted on the primary and metastatic choriocarcinoma, placental site trophoblastic tumor, sebaceous carcinoma, adrenal cortical adenoma and carcinoma. But it did not react on the squamous cell carcinoma, the basal cell carcinoma and malignant melanoma of the skin, the adenocacinoma and the leiomyosarcoma of the uterus, the metastatic and primary renal cell carcinoma. From these results, the polyclonal antibody against human placental 3beta-HSD demonstrated to have specific reaction on steroidogenic tumors and also it can be used in differential diagnosis of primary and metastatic related to steroid hormone.
Adenoma ; Adrenal Cortex ; Adrenocortical Carcinoma ; Blotting, Western ; Carcinoma, Basal Cell ; Carcinoma, Renal Cell ; Carcinoma, Squamous Cell ; Choriocarcinoma ; Diagnosis, Differential ; Estrogens ; Female ; Humans* ; Leiomyosarcoma ; Leydig Cells ; Luteal Cells ; Male ; Melanoma ; Ovary ; Oxidoreductases* ; Pregnancy ; Progesterone ; Sebaceous Glands ; Skin ; Testis ; Trophoblastic Tumor, Placental Site ; Trophoblasts ; Uterus