Long term treatment of congenital hypothyroidism with L-triiodothyronine: 24 year follow-up

A congenital hypothyroidism complicated by ventricular septal defects which was treated with L-triiodothyronine (L-T3) alone from 1 5/12 to 25 years, is described. The patient's growth and development was satisfactory and without side effects. It suggests that L-T3 may be a safe drug for long term treatment of congenital hypothyroidism.     

Sleep-related growth hormone release in thyrotoxic patients before and during propylthiouracil therapy

Hyporesponsiveness of GH to insulin-induced hypoglycemia has previously been reported in hyperthyroid patients. In order to clarify the GH secretion in thyrotoxic patients, sleep-related increases in the serum GH concentration were investigated. Eight thyrotoxic females ranging in age from 7 to 15 were treated with PTU. Blood samples for measurement of GH were drawn every 15 minutes during the first few hours of sleep before and during the treatment lasting about three months. The mean maximum serum GH level before the treatment was 10.0 +/- 5.5 ng/ml (mean +/- SD); this rose to 23.2 +/- 14.6 ng/ml (P less than 0.02) during the treatment. The maximum value of more than 10 ng/ml was detected in only 3 out of the 8 patients before treatment. On the other hand, serum GH levels during PTU administration rose to above 10 ng/ml in all patients except one. It was revealed that sleep-related elevations of GH occurred early in sleep and in close association with a slow-wave EEG pattern. The results show that sleep-related GH release is low in the hyperthyroid state, but becomes significantly elevated during PTU administration. However, even in the hyperthyroid state, the sleep-related secretion of GH is closely correlated with the slow-wave sleep stage as in the euthyroid condition.     

Distribution of vasopressin and oxytocin in rat brain

Arginine-vasopressin and oxytocin in various portions of rat brain were determined by radioimmunoassays. The hormones were extracted from tissue samples into 0.1 N HCl and then purified partially with acetone-petroleum ether extraction. The non-equilibration method was used for the assays. In this method recovery rates of arginine-vasopressin and oxytocin were 73.0 +/- 4.4% and 75.0 +/- 3.8%, respectively. Sensitivities of the assays were 1 pg of arginine-vasopressin and 0.75 pg (0.3 microU) of oxytocin per assay tube. The higher concentrations of arginine-vasopressin and oxytocin were confirmed in the hypothalamo-neurohypophyseal system, where these hormones are synthesized, transported and stored. Relatively high concentrations of these hormones, especially oxytocin, were detected in spinal cord. Amygdala, hippocampus, limbic forebrain and pineal body contained a certain amount of arginine-vasopressin (2-20 pg/mg protein). Oxytocin (1-7 pg/mg protein) was also detected in amygdala, pons and medulla oblongata, pineal body and midbrain. The low concentrations of these hormones were also found in cerebral cortex and cerebellum.     

Characterization of extracellular matrix-associated glycosaminoglycans produced by untransformed and transformed bovine corneal endothelial cells in culture

A cloned bovine corneal endothelial cell line was transformed in vitro by simian virus 40, and the subendothelial extracellular matrix-associated sulfated glycosaminoglycans synthesized by the cells were isolated and compared with their untransformed counterpart. The transformed endothelial cells grew at faster rates to higher stationary cell densities in the absence of fibroblast growth factor than did the untransformed cells. On a per-cell basis, the transformed cells produced slightly lower amounts of sulfated glycosaminoglycans. The rate of production of sulfated glycosaminoglycans in extracellular matrix increased during seven days of culture. At confluency the extracellular matrix-associated sulfated glycosaminoglycans synthesized by the untransformed endothelial cells consisted of about 80% heparan sulfate and about 20% chondroitin sulfate. Extracellular matrix-associated sulfated glycosaminoglycans of transformed endothelial cells were composed of about 70% heparan sulfate and about 30% chondroitin sulfate plus dermatan sulfate. High-speed gel permeation chromatography profiles on Fractogel TSK HW-55(S) of matrix-associated heparan sulfate from untransformed and transformed endothelial cells were very similar, and gave single peaks (Kav = 0.19). Apparent Mr estimated from the eluting position of the peaks were approximately 47000. Heparan sulfate from both untransformed and transformed endothelial cells was degraded by incubation with a metastatic B16 melanoma cell lysate containing heparanase (heparan-sulfate-specific endo-beta-glucuronidase). The eluting position of the heparan sulfate degradation products on gel permeation column were similar (Kav = 0.43). Size analysis and anion-exchange chromatography of the degradation products after nitrous acid deamination at low pH indicated that the degree of N-sulfation of heparan sulfate was similar in untransformed and transformed endothelial cells. The results indicated that transformation of endothelial cells only slightly changes the molecular nature of subendothelial matrix-associated sulfated glycosaminoglycans.     

Comparison of beta-glucan structures in a cell wall mutant of Saccharomyces cerevisiae and the wild type

A mutant of Saccharomyces cerevisiae defective in the cell wall beta-glucan structure was obtained. The mutant cells are extremely sensitive to (beta 1-3)-glucanase digestion and mild alkali treatment. Structural analysis revealed that the alkali-insoluble, skeletal glucan from wild type cells contains two components, a (beta 1-3) linked glucan with a laminated structure, and a highly branched glucan containing predominantly (beta 1-6) linkages. The mutant cells lack the latter component.     

Restriction endonuclease EcoO109 from Escherichia coli H709c with heptanucleotide recognition site 5'-PuG/GNCCPy

A new restriction endonuclease, EcoO109, has been isolated from Escherichia coli H709c by polyethyleneimine (PEI) precipitation, DEAE-cellulose chromatography and heparin agarose chromatography. The yield was high, more than 3000 units/g of wet cells. The EcoO109 endonuclease recognizes and cleaves a nucleotide sequence of (formula: see text), in the presence of 10 mM Mg2+. The enzyme will be useful for structural analysis and molecular cloning of DNA because of the stability, high yield and easy handling of the producer strain.     

Inheritance of hydronephrosis in the inbred mouse strain DDD

The mode of inheritance of hydronephrosis was investigated by crossing inbred DDD mice having a high incidence of hydronephrosis and C57BL/6 mice having normal kidneys. In the males, incidences of hydronephrosis in F1 animals were intermediate between the two parental strains at a rate of 32.6% in (DDD x C57BL/6)F1 and 23.4% in reciprocal F1. The same tendency was observed in F2 male animals. In BCF1 males, the number of affected mice was higher in (C57BL/6 x DDD) F1 x DDD (72.4%) than in (DDD x C57BL/6)F1 x C57BL/6 (11.1%). A few affected mice were found among the females of hybrids F1, F2 and BCF1. These results suggested that hydronephrosis in the DDD strain of mice was controlled by polygenes, and that male hormones may have some effect on the occurrence of hydronephrosis.     

Selective accumulation of heavy metals by microorganisms

Summary An investigation of the removal and recovery of urnnium from aqueous systems using microbial biomass has been described previously (Nakajima et al. 1982). To establish which microorganisms accumulate the most uranium, we extended our investigation of uranium uptake to 83 species of microorganisms, 32 bacteria, 15 yeasts, 16 fungi and 20 actinomycetes. Of these 83 species of microorganisms tested, extremely high uranium-absorbing ability was found in Pseudomonas stutzeri, Neurospora sitophila, Streptomyces albus and Streptomyces viridochromogenes.The selective accumulation of heavy metal ions by various microorganisms has also been examined. Uranyl, mercury and lead ions were readily accumulated by almost all the species of microorganisms tested. Actinomycetes and fungi differ from many bacteria and most yeasts in their selective accumulation of uranium and mercury.In addition to this fundamental research, uranium recovery was investigated in immobilized Streptomyces albus, a microorganism with high uranium-uptake ability. These immobilized cells adsorbed uranium readily and selectively. The immobilized cells recovered uranium almost quantitatively and almost all uranium absorbed was desorbed with 0.1 M Na₂CO₃. The dry weight of the free cells decreased by 50% during 5 adsorption-desorption cycles. However, the dry weight of the immobilized cells decreased by only 2% during 5 cycles. These results showed that microbial cells are more stable after immobilization and can be used repeatedly for the process of uranium adsorption-desorption.     

Enhancement of adipose S-100 protein release by catecholamines

When rat epididymal fat-pad pieces were incubated in vitro with 10 microM epinephrine, S-100 protein in the tissue was markedly decreased by release into the medium. The release of adipose S-100 protein was also enhanced by norepinephrine (10 microM), isoproterenol (10 microM), and dibutyryl cyclic AMP (5 mM), but not by insulin (0.8 microM). The enhancement of S-100 protein release by 10 microM epinephrine was completely inhibited by 10 microM propranolol. These results suggest that the release of adipose S-100 protein is regulated by the beta-adrenergic effect of catecholamines.     

Changes in leukocyte count, blood glucose and coagulation system in calves injected with Escherichia coli endotoxin

Responses of leukocyte, blood glucose and coagulation system in calves were investigated to injection with Escherichia coli endotoxin. Severe leukopenia and hyperglycemia following transient hypoglycemia were noted within 24 hours after injection. In the coagulation system, a definite decrease in platelet count, prolongation of prothrombin time and activated partial thromboplastin time were observed. Fibrinogen, soluble fibrin monomer complex and clotting time, however, varied.