Endocrinologia japonica

Publisher: Nihon Naibunpi Gakkai; Nihon Naibunpi Gakkai. Tò„bu Bukai

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  • Other titles
    Endocrinologia japonica
  • ISSN
    0013-7219
  • OCLC
    1567878
  • Material type
    Periodical
  • Document type
    Journal / Magazine / Newspaper

Publications in this journal

  • XIV Endocrinology Congress, Endocrinologia japonica, Kyoto, Japan; 03/2010
  • XIV Endocrinology Congress, Endocrinologia japonica, Kyoto, Japan; 03/2010
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    ABSTRACT: The in vivo effects of gestrinone (R2323) and medroxyprogesterone acetate (MPA) on the estrogen production by rat ovaries were investigated. Hypophysectomized immature female rats treated with 2.5 or 5 IU of pregnant mare serum gonadotropin (PMS) were daily given vehicle only, gestrinone (0.5 mg/kg body weight) or MPA (10 mg/kg body weight), and the activities of 3 beta-hydroxysteroid dehydrogenase, 17 alpha-hydroxylase, 17, 20-lyase, 17 beta-hydroxysteroid dehydrogenase and aromatase in ovaries of these rats were measured. Gestrinone suppressed the 3 beta-hydroxysteroid dehydrogenase activity and increased activities of 17 alpha-hydroxylase, 17, 20-lyase and aromatase in ovaries stimulated by 5 IU of PMS, while MPA suppressed activities of 17 alpha-hydroxylase and aromatase in these ovaries. On the other hand, the aromatase activity in ovaries stimulated by 2.5 IU of PMS was suppressed by gestrinone and increased by MPA, and neither gestrinone nor MPA affected the production of aromatizable androgens from progesterone by these ovaries. Thus, gestrinone and MPA administrated in vivo showed divergent influences on steroidogenic enzyme activities in ovaries, but they did not affect the serum concentration of estradiol-17 beta. The present results suggest that neither gestrinone nor MPA reduced estrogen production by the rat ovary under the gonadotropin stimulation although they influenced some process of its steroidogenesis.
    Endocrinologia japonica 01/1993; 39(6):615-21.
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    ABSTRACT: To analyze whether prolactin (PRL) in human follicular fluid (FF) is synthesized locally or derived from the circulation, PRL concentrations of plasma and FF were determined in the patients after ovarian stimulations. The amounts of PRL messenger ribonucleic acid (mRNA) in the follicular tissues during different menstrual phases were also determined. The FF PRL concentration was correlated positively with plasma PRL and highest estradiol levels during the stimulatory cycle. No PRL mRNA sequence was detected in the RNAs extracted from follicles at any stage in the menstrual cycle, although beta-actin mRNA was detected in all samples. In a comparison with pituitary RNA, the PRL mRNA concentration in ovarian follicular tissues seemed to be 10,000 times less than that in the pituitary. These results suggest that FF PRL may not be synthesized locally, but derived from the pituitary via the circulation through passive diffusion, and thus regulated by estrogen.
    Endocrinologia japonica 01/1993; 39(6):601-7.
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    ABSTRACT: To characterize parathyroid hormone-related protein (PTHrP) in the human placenta, we measured PTHrP-like immunoreactivity (PRP-LI) in the term placenta and studied the elution profiles of placental tissue extracts on Sephadex G-75 chromatography with a specific RIA. We also examined the gene expression of PTHrP mRNA by Northern blot analysis and the localization of PRP-LI in the placenta by immunohistochemistry. The amount of PRP-LI in placental extracts (n = 7) was 20.9 +/- 2.2 pg/g wet tissue (mean +/- SE). Dilution curves of placental tissue ran parallel to those of synthetic PTHrP (1-34) standards. Sephadex G-75 gel chromatography demonstrated two major PRP-LI peaks; the first peak was eluted around the molecular size between 10 kilodaltons (Kda) and 20 Kda and the other around 5 Kda. Northern blot analysis of PTHrP mRNA extracted from placental tissues showed a major hybridization signal around 18S. PTHrP immunohistochemistry showed PRP-LI staining in the cytoplasm of syncytiotrophoblasts and stroma cells (Hofbauer cells) in the term placenta. These results suggest that syncytiotrophoblasts and stroma cells in the term placenta synthesize PTHrP in two major molecular forms, 10 Kda-20 Kda and around 5 Kda.
    Endocrinologia japonica 01/1993; 39(6):555-61.
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    ABSTRACT: Immunocytochemical double-staining analysis revealed that in the rat anterior pituitary 86% of cells containing the beta II-subspecies of protein kinase C also contained follicle stimulating hormone (FSH), and that 22% of these FSH cells expressed the beta II-subspecies. These findings suggest a close relationship between the beta II-subspecies of protein kinase C and FSH regulation.
    Endocrinologia japonica 01/1993; 39(6):609-13.
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    ABSTRACT: We report the case of a 70-year-old man who developed hypothyroidism associated with TSH receptor antibodies and severe ophthalmopathy during lithium therapy. He had received lithium therapy for more than 20 years for manic depression, when ophthalmopathy (class VI of the American Thyroid Association classification) and mild hypothyroidism developed. Orbital magnetic resonance imaging indicated marked enlargement of the superior, medial and inferior rectus muscles in the left eye. He had anti-eye muscle antibodies in his serum, detected by Western blotting and quantified by chromatoscanning, as well as anti-TSH receptor antibodies. He was treated with supplementation of levothyroxine and four cycles of methylprednisolone pulse therapy. After the pulse therapy, both anti-eye muscle antibodies and anti-TSH receptor antibodies decreased and disappeared in parallel with the improvement in eye symptoms and signs. These observations suggest the importance of anti-eye muscle antibodies as clinical markers in the development of thyroid-associated ophthalmopathy.
    Endocrinologia japonica 01/1993; 39(6):593-600.
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    ABSTRACT: To examine whether or not dehydroepiandrosterone sulfate (DHAS) is a substrate for steroidogenesis in the corpus luteum, we studied 17 women in the luteal phase, the follicular phase, and after castration. Following suppression of adrenal function with dexamethasone, DHAS was administered intravenously and the serum levels of DHAS, dehydroepiandrosterone (DHA), androstenedione (ADS), testosterone (T), 17 beta-estradiol (E2) and progesterone (P) were measured serially for 24 h. An obvious increase in the serum levels of all steroids except for E2 and P was observed in each subject for at least 8 h after DHAS administration. To evaluate the effect of DHAS on the serum levels of the steroid hormones, the integrated response area (IRA) was calculated for each hormone in all the subjects. The IRA values for ADS, T and E2 (at 2 and 4 h) in the luteal phase group were significantly higher than in the other DHAS treated groups, and the IRA values for DHA and P tended to be higher than in the other groups. These results suggest that the corpus luteum utilizes serum DHAS as a substrate for steroidogenesis.
    Endocrinologia japonica 01/1993; 39(6):539-48.
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    ABSTRACT: Thyroxine-binding globulin (TBG) is the major thyroid hormone transport protein. Several inherited TBG variants resulting in partial or complete TBG deficiencies have been shown to be caused by either one or two nucleotide substitutions, or one nucleotide deletion in the coding regions of the TBG gene. In this report, a Japanese female patient (proband) with hyperthyroid state, whose lower TBG levels did not return to normal under the euthyroid state after treatment was examined. Genomic DNA samples from the proband with thyroxine-binding globulin deficiency (termed TBG-Kumamoto) and her family were subjected to the polymerase chain reaction, and the generated DNA fragments were sequenced. A single nucleotide substitution in the codon for the amino acid 363 of native TBG molecule (CCT to CTT) was found, resulting in the replacement of proline by leucine. It was revealed that the proband was a heterozygote and her father was a hemizygote. The mutation was confirmed by the allele-specific amplification of genomic DNAs from the proband and her father using oligonucleotide primers of normal or mutant residues at the 3' position in the polymerase chain reaction. These results indicate that the abnormality of TBG-Kumamoto is the consequence of this mutation. Genetically, this point mutation observed in TBG-Kumamoto might be classified as a new type of TBG deficiency.
    Endocrinologia japonica 01/1993; 39(6):577-84.
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    ABSTRACT: Transient extreme insulin resistance was encountered during an episode of diabetic ketoacidosis (DKA) in an insulin-treated diabetic patient. On admission, the plasma glucose level was 1241 mg dl-1 and arterial blood pH 6.895 with HCO3- 4.7 mEql-1. An intravenous bolus injection of 20 units, followed by continuous infusion of 20 units h-1 of short-acting regular human insulin, was instituted. Ischemic myocardial changes were noted on the initial electrocardiogram, therefore fluid replacement was limited to 1,000 ml of 0.9% saline solution in the first hour. As the plasma glucose level declined by only 203 mg dl-1 (41 mg dl-1 h-1) in the first 5 h, the insulin dose was doubled every 2 h. At hour 4, the patient developed circulatory shock which required vasopressor support and respiratory assistance. A plasma glucose level of 300 mg dl-1 was not achieved until the total dosage of insulin amounted to 91,580 units at hour 25. Insulin resistance was not observed from that point on. The patient had neither insulin antibodies nor anti-insulin receptor antibodies in serologic testing. The insulin binding characteristics of the patient's erythrocytes were similar to those from healthy controls both with and without experimental acidosis and with a high level of beta-hydroxybutyrate. Among multiple potential factors, the severe shock associated with DKA has been considered as a primary cause of the transient severe insulin resistance in this case.
    Endocrinologia japonica 01/1993; 39(6):571-6.
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    ABSTRACT: Increasing evidence of the interaction of glucocorticoids and ovarian steroids prompted the current study. Effects of exogenously administered corticosterone acetate (3.5 mg/100 g b.w/day for one week) were examined on splenic nucleic acids, protein, lactate, and on lactate dehydrogenase (LDH) specific activity and its isozymes in ovariectomized and ovary-intact Wistar rats (65-75 days old). Ovariectomy resulted in no significant change in the parameters studied except DNA which increased significantly. The administration of corticosterone to these rats did not produce any remarkable change in the ovariectomy caused increase in splenic DNA content. Nevertheless, it decreased the ratio of heart type subunits (H)/muscle type subunits (M) [H/M] of LDH isozymes. In the case of ovary-intact rats, corticosterone produced an increase in the concentration of splenic lactate but a decrease in the H/M ratio. Exogenously administered corticosterone exerts selective synergistic interaction with ovarian hormones on splenic lactate. The specific activity of LDH and the concentrations of RNA and protein remained unchanged during the interaction between ovarian hormones and corticosterone.
    Endocrinologia japonica 01/1993; 39(6):549-54.
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    ABSTRACT: A familial case of generalized resistance to thyroid hormone (GRTH) is described. A 17-year-old man (case 1), who had been treated with methimazole under the diagnosis of Graves' disease and his 11-year old sister (case 2) visited our clinic for the evaluation of their thyroid function. They lacked the signs and symptoms of thyrotoxicosis in spite of extremely high serum thyroid hormone levels. Their plasma TSH levels were not suppressed, but in fact markedly increased after TRH loading. Their peripheral indices of thyroid hormone were within normal limits and were not influenced by exogenous T3 administration. Even 150 micrograms T3 administration for 7 days did not fully suppress the TRH-stimulated TSH level in case 2. The two patients thus were diagnosed to have GRTH. Sera from their father and another sister showed identical abnormalities.
    Endocrinologia japonica 01/1993; 39(6):533-8.
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    ABSTRACT: To analyze the utility of insulin-like growth factor binding protein-3 (IGFBP-3) radioimmunoassay for diagnosis of growth hormone deficiency (GHD) we measured IGFBP-3 in sera from normal children, short children and patients with GHD. The sensitivity (true positive ratio) of IGFBP-3 for complete GHD (cGHD) was 93%, while the specificity (true negative ratio) for normal short children (NS) was 88%. In contrast, the sensitivity of IGFBP-3 for partial GHD (pGHD) was only 43%. The poor discrimination between patients with pGHD and NS may be the result of their relatively similar GH level, as compared to cGHD, or due to the limitations of GH stimulation tests. The specificity of IGFBP-3 for NS was excellent in children of all ages: less than 10 years old (87%) and older than 10 (88%). However, sensitivity for GHD was good for children less than 10 years old (84%) but poor for children older than 10 (64%). IGFBP-3 may be less sensitive for diagnosing GHD in older children because IGFBP-3 levels may also increase during puberty due to mechanisms independent of the GH-IGF-I axis.
    Endocrinologia japonica 01/1993; 39(6):585-91.
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    ABSTRACT: Adrenal computed tomographic (CT) scanning was conducted in twelve patients with Addison's disease during the clinical course. In tuberculous Addison's disease (n = 8), three of four patients examined during the first two years after disease onset had bilaterally enlarged adrenals, while one of four had a unilaterally enlarged one. At least one adrenal gland was enlarged after onset in all six patients examined during the first four years. Thereafter, the adrenal glands may atrophy bilaterally, in contrast to adrenal glands in idiopathic Addison's disease, which atrophy bilaterally from disease onset (n = 2). Adrenal calcification was a less sensitive clue in tracing pathogenesis, i.e., adrenal calcification was observed in five of eight patients with tuberculous Addison's disease, but not in idiopathic patients. Thus, adrenal CT scanning could show the etiology of Addison's disease (infection or autoimmunity) and the phase of Addison's disease secondary to tuberculosis, which may be clinically important for initiating antituberculous treatment.
    Endocrinologia japonica 01/1993; 39(6):563-9.
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    ABSTRACT: To clarify whether serum free fatty acid (FFA) is an inhibitor of extrathyroidal conversion (IEC) of thyroxine (T4) to thyronine (T3), we measured the concentration of FFA, IEC activity and thyroid hormones in normal subjects, acute ketotic children and children with low T3 syndrome due to nonthyroidal illness (NTI). Iodothyronine (I) 5'-deiodinase activity was assayed with reverse triiodothyronine (rT3) as substrate and liberated 125I-was measured. The IEC was determined by the inhibition of I 5'-deiodination by ether extract of sera or standard oleate solution. IEC values were represented as mM oleate. The serum concentration of FFA was 0.470 +/- 0.117 (SD) mM in 11 normal subjects, and it was significantly higher (1.242 +/- 0.248 mM; P < 0.01) in 10 acute ketotic children and in 7 samples from 6 NTI children (0.904 +/- 0.530 mM; P < 0.05). In contrast, there was no difference in IEC among three groups (normal subject, 0.451 +/- 0.069 mM; acute ketosis, 0.437 +/- 0.040 mM; NTI, 0.465 +/- 0.224 mM). No correlations were found between IEC activity and the serum FFA concentration or thyroid hormones in 28 samples from three groups. The sequential changes in serum thyroid hormones, FFA and IEC in 3 of 6 NTI children revealed no consistent relationship. Furthermore, one NTI child had significantly high IEC (> 1.000 mM) but its serum FFA (1.182 mM) was below the mean value for the acute ketotic group. These results indicate that 1) many NTI patients may bear no relation to IEC and 2) IEC may not be caused by serum FFA only but includes several factors.
    Endocrinologia japonica 12/1992; 39(6):525-31.
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    ABSTRACT: It has been shown that the expression of protooncogenes, c-fos and c-jun, induced by growth factors and hormones plays important roles in cellular proliferation, tissue differentiation and transcription of certain genes. Since gonadotropin stimulates ovarian steroidogenesis and cellular proliferation, we investigated whether gonadotropin affects the expression of c-fos and c-jun genes in rat ovaries. The expression of mRNA coding side chain cleavage enzyme (P450scc), the rate limiting enzyme in ovarian steroidogenesis was also studied. The effect of gonadotropin was examined in female rats whose gonadotrophs were medically ablated by GnRH agonist (TAP-144-SR). After intravenous administration of pregnant mare's serum gonadotropin (PMSG:30 IU/rat), their ovaries were dissected out at various time intervals and total RNA was extracted. Changes in the levels of c-fos, c-jun and P450scc mRNAs were determined by Northern blot analysis. The levels of c-fos and c-jun mRNAs increased rapidly and transiently with the peak levels at 15 min after PMSG administration. The levels of both mRNAs were decreased by 30 to 60 min. On the other hand, the levels of P450scc mRNA started to increase 60 min after PMSG. These results indicate that gonadotropin-induced increase in the expression of c-fos and c-jun genes may play important roles in mediating the action of gonadotropin on the ovaries.
    Endocrinologia japonica 11/1992; 39(5):455-60.
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    ABSTRACT: The relationship between type I iodothyronine 5'-monodeiodinase (5'-MD) and protein disulphide isomerase (PDI) was investigated by using a synthetic 18-amino acid peptide (LAP475c), which corresponds to the sequence of amino acids at position 373-390 of PDI including its active site, and anti-LAP475c antibody. Western blot analysis revealed that our anti-LAP475c antibody was highly specific for 57K protein in solubilized rat liver microsomal protein (SRLMP) that corresponded to PDI. Anti-LAP475c IgG (1:100 dilution) precipitated 46% of 5'-MD. These data suggest that PDI may play a regulatory role in the 5'-monodeiodination reaction.
    Endocrinologia japonica 11/1992; 39(5):461-4.
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    ABSTRACT: Changes in the membrane potential and the intracellular Ca2+ concentration ([Ca2+]i) caused by somatostatin (SRIF) were simultaneously measured in human GH-producing pituitary tumor cells, by means of the nystatin-perforated whole cell clamp technique and Fura-2 AM. An application of 10(-8) M SRIF hyperpolarized the membrane and arrested Ca(2+)-dependent spontaneous action potentials. [Ca2+]i concurrently decreased during membrane hyperpolarization. When the membrane potential was clamped below the threshold for voltage-gated Ca2+ channels, [Ca2+]i decreased and SRIF did not further reduce [Ca2+]i. In cells which did not show spontaneous action potentials, SRIF hyperpolarized the membrane but it affected [Ca2+]i little. From these results it was concluded that the reduction in [Ca2+]i caused by SRIF was ascribed to the decrease in Ca2+ influx through voltage-gated channels during membrane hyperpolarization. The effect of SRIF on the voltage-gated Ca2+ channel current was also examined under the perforated whole cell clamp. SRIF (10(-8) M) inhibited the Ca2+ channel current to 80.8 +/- 15.4% (n = 5) of the control. Because SRIF-induced inhibition of the voltage-gated Ca2+ channel current was not prominent, it was considered that membrane hyperpolarization is the major cause of the reduction in [Ca2+]i in human GH-producing cells.
    Endocrinologia japonica 11/1992; 39(5):491-7.
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    ABSTRACT: In this paper, we report a 49-year-old female with subacute thyroiditis who had thyroid-stimulating antibodies (TSAb) and thyroid-stimulation-blocking antibodies (TSBAb) in serum. Although she was in the thyrotoxic phase and TSH was suppressed in May, 1990, her radioactive iodine uptake (RAIU) was not suppressed (35.5%) and a thyroid scan disclosed a diffuse goiter with no defect. Serum assays revealed the presence of TSAb, but TSBAb were negative. In August, 1990, the right lobe became undetectable by thyroid scan when the RAIU was 20.7% with the TSH level remaining suppressed. At that time, TSAb were negative, while TSBAb were positive. When the RAIU was 31.1% in October, 1990, both thyroid lobes became visible and the TSH level was normalized. TSBAb became negative, and although TSAb reappeared it later became undetectable. These results indicate that the changes in the patient's thyroid scan and RAIU were attributable to the presence of TSAb.
    Endocrinologia japonica 11/1992; 39(5):469-76.
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    ABSTRACT: To determine the importance of adrenal steroid in the effects of interleukin-1, we investigated changes in the number of islet cells reactive toward antiserum to insulin (anti-Ins) by intraperitoneal administration of recombinant human interleukin-1 beta (IL-1) in intact and adrenalectomized (ADX) rats. IL-1 significantly reduced serum insulin levels in ADX rats only, while it similarly decreased plasma glucose levels. In intact rats, IL-1 did not affect the number of islet cells reactive to anti-Ins, although cytoplasmic immunostaining tended to be reduced by IL-1 treatment. Only adrenalectomy decreased the number of islet cells immunostained by anti-Ins. Furthermore, IL-1 treatment significantly reduced the number of islet cells reactive to anti-Ins in ADX rats. The present study immunohistochemically supported our working hypothesis that the withdrawal of adrenal steroids by adrenalectomy enhances the islet cell sensitivity to exogenous administration of IL-1.
    Endocrinologia japonica 11/1992; 39(5):485-90.