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991.
Purification and Properties of the Cathepsin D Type Proteinase from Beef and Rabbit Lung and Its Identification in Macrophages
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Oscar Rojas-Espinosa Arthur M. Dannenberg Jr. Patrick A. Murphy Patricia A. Straat P. C. Huang Stephen P. James 《Infection and immunity》1973,8(6):1000-1008
The acid-acting proteinase, cathepsin D (EC 3.4.4.23), was purified from extracts of homogenized rabbit lung and beef lung by autolysis at acid pH, acetone and ammonium sulfate fractionation, column chromatography, and isoelectric focusing. Four isoenzymes were obtained from each source. With acid hemoglobin as the substrate, the proteinase from rabbit lung had a pH optimum of 3.0 and that from beef lung had a pH optimum of 3.6. Their activity was not affected by thiol reagents or by Fe(2+), Mn(2+), or Mg(2+). One isoenzyme from rabbit lung was used to immunize a goat, and one from beef lung was used to immunize a rabbit. In immunoelectrophoresis, each resulting antiserum formed a single precipitin line with its homologous enzyme. They cross-reacted with the other three isoenzymes from the same species, but not with any isoenzyme from the other species. At high concentrations, each antiserum completely inhibited the proteolytic activity of its homologous enzyme. The antiserum against rabbit lung cathepsin D also inhibited the proteolytic activity of rabbit peritoneal and pulmonary macrophages. In limited quantities, this antiserum has now been made commercially available and is being used with labeled antibody techniques to identify under a microscope the presence of cathepsin D in macrophages and to study its role in the pathogenesis of tuberculosis. 相似文献
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Oscar M. Helmer 《Canadian Medical Association journal》1964,90(4):221-225
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Cerebroside synthetic activities vary according to age in homogenates of the pons and cortical gray matter from brains of rhesus monkeys. The rate of utilization of uridine diphosphate (UDP) galactose and hydroxy fatty acid (HFA) ceramide for cerebroside synthesis by the pons was very low until 100 days after conception and reached a maximum at about 150 days (15 days before birth). This activity was very low in gray matter.
There were marked effects of the type of ceramide and UDP sugar added, as well as of the origin of the brain homogenates from gray matter or pons on the quantity and type of cerebroside synthetized. 相似文献
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David M. Mel Branko Cvjetanovi? Oscar Felsenfeld 《Bulletin of the World Health Organization》1970,43(3):431-437
In earlier studies in man it has been demonstrated that streptomycin-dependent shigellae, if given orally in 5 sufficiently large doses, confer a very high type-specific protection against bacillary dysentery. 相似文献
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Prof. Dr. med. Oscar Hoffer 《Journal of orofacial orthopedics》1956,17(3):165-175
Ohne ZusammenfassungMit 37 Abbildungen 相似文献