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931.
932.
Structure of mitochondrial cristae membranes   总被引:11,自引:0,他引:11  
  相似文献   
933.
The rate of phosphorylation of 2-deoxy-D-glucose (2dGlc) was determined by incubating Schistosoma mansoni in vitro in [3H]2-deoxy-D-glucose; 60 sec after exposure to the [3H]dGlc, [14C]dGlc was added to the medium, and metabolic activity was arrested at 2 min by immersion of the tissue in ice-cold silicone oil. Column chromatographic separation of the neutral [3H]- and [14C]dGlc from the [3H]- and [14C]2-deoxy-D-glucose-6-phosphate permitted estimation of the quantity of [3H]dGlc phosphorylated in 2 min, and the proportion of [14C]dGlc phosphorylated in 1 min; thus a phosphorylation rate was determined from a single tissue sample. In male schistosomes derived from mouse infections 4.4 +/- 0.8% of the dGlc was phosphorylated each minute, and 4.2 +/- 0.9% in the females. Lower rates of phosphorylation were measured in schistosomes taken from hamsters where males phosphorylated 2.4 +/- 1.1% of the dGlc each minute, and in females 2.7 +/- 1.0%. These studies suggest the high rate of hexose utilization by schistosomes compares to the conscious rat brain, where 11% of the dGlc is phosphorylated each minute.  相似文献   
934.
935.
Doxorubicin (adriamycin) is cytotoxic to cells, but the biochemical basis for this effect is unknown, although intercalation with DNA has been proposed. This study suggests that the cytotoxicity of this drug may be due to inhibition of the plasma membrane redox system, which is involved in the control of cellular growth. Concentrations between 10–6–10–7 M adriamycin inhibit plasma membrane redox reactions >50%. AD32, a form of adriamycin which does not intercalate with DNA, but is cytotoxic, also inhibits the plasma membrane redox system. Thus, the cytotoxic effects of adriamycin, which limit its use as a drug, may be based on the inhibition of a transplasma membrane dehydrogenase involved in a plasma membrane redox system.  相似文献   
936.
A study of NADH ferricyanide reductase activity in oriented vesicles or open ghosts of human and porcine erythrocytes shows that the dehydrogenase activity can have three types of orientation in the membrane. There is activity which responds only to acceptors and NADH exclusively on the inside face, or exclusively on the outer surface. There is also activity which requires exposure of both sides of the membrane and thus is transmembranous. The transmembrane activity is inhibited by insulin, whereas the internal and external enzymes do not respond to insulin. The transmembrane dehydrogenase can be a basis for proton transport in the plasma membrane.  相似文献   
937.
Diferric transferrin which is often necessary for growth of cells is reduced by the transplasma membrane electron transport system of HeLa cells with release of ferrous iron outside the cell. Reduction of external diferric transferrin is reflected in oxidation of internal NADH. Adriamycin, an antitumor drug, inhibits diferric transferrin reduction by the HeLa cells and inhibits concomittant oxidation of cytosolic NADH at concentrations, 10(-8)-10(-6)M, which inhibit cell growth. Isolated liver plasma membranes have an NADH diferric transferrin reductase activity which is inhibited by similar adriamycin concentrations. We propose that inhibition of cell growth by adriamycin can be based on inhibition of transplasmalemma diferric transferrin reductase.  相似文献   
938.
939.
Journal of Biological Physics - A molecular beam spectrometer using dielectrophoresis is described which should be useful in studies of molecular polarizabilities, dipole moments, rotational energy...  相似文献   
940.
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