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1.
Phosphate-Activated Glutaminase in the Crude Mitochondrial Fraction (P2 Fraction) from Human Brain Cortex 总被引:1,自引:1,他引:0
Gerd Svenneby Bjørg Roberg Svein Hogstad Ingeborg Aa. Torgner Elling Kvamme 《Journal of neurochemistry》1986,47(5):1351-1355
The kinetics and other properties of phosphate-activated glutaminase have for the first time been studied in the crude mitochondrial fraction (P2 fraction) from human brain. The enzyme is for unexplained reasons inactivated postmortem. The enzyme activity decreases by storing the tissue or homogenate at 37 degrees C. The inactivation is not caused by formation of a dialysable inhibiting compound. No large proteolytic degradation has occurred, since the phosphate-activated glutaminase-like immunoreactive band did not disappear during the storage. The molecular weight of the subunit of the enzyme as determined by immunoblots of sodium dodecyl sulfate-treated homogenates from human brain is estimated to be approximately 64 K. The enzyme has been shown to have a pH optimum of 8.6; it is activated by phosphate, inhibited by glutamate, and partially inhibited by ammonia. Double-inverse plots of enzyme activity against phosphate are concave-upward, and more so in the presence of an inhibitor. The inhibition by glutamate appears to be noncompetitive with the substrate glutamine, and competitive with the activator phosphate. These kinetic properties are not significantly different from our earlier observations concerning phosphate-activated glutaminase from pig brain and pig kidney. 相似文献
2.
Abstract: Possible effects on the physiological activity and culturability of soil microorganisms by different soil dispersion procedures, and effects on activity caused by extracting bacteria from soil, were investigated. There was no apparent difference in cfu's with dispersion of a silty loam soil and a loamy sand soil with pyrophosphate as compared to dispersion in NaCl. Substrate-induced respiration was reduced in the silty loam soil, and methanol oxidation was reduced in the loamy sand soil with dispersion in pyrophosphate, and the soil pH was irreversibly increased by the treatment. Extracted bacterial fractions had lower numbers of culturable cells as percentage of the total number of bacteria in each fraction, lower respiration rates and no methanol oxidation activity as compared to the soil slurry both before and after extraction. The physiological activity was apparently not affected by the number of cells extracted. This indicates that the increased extraction rate of indigenous soil bacteria obtained by effective disruption of aggregates and detachment of cells from surfaces, only results in increased extraction of cells that have been physiologically changed as a result of the extraction process. 相似文献
3.
Kapel Chr. M. Henriksen Sv. Aa. Dietz H. H. Henriksen P. Nansen P. 《Acta veterinaria Scandinavica》1994,35(2):125-132
Studies were carried out on the predilection sites of Trichinella spiralis muscle larvae in experimentally infected arctic foxes (Alopex lagopus) and silver foxes (Vulpes vulpes) reared in cages. The highest number of larvae per gramme tissue was found in the muscles of the legs, eyes, diaphragm, and tongue. The 2 fox species showed no significant differences with regard to predilection sites. 相似文献
4.
用浅麻醉的Wistar大鼠40只,以辐射热照尾作为伤害性刺激,经玻璃微电极引导尾核痛兴奋神经元(PEN)和痛抑制神经元(PIN)的放电,同时测量甩尾反射潜伏期(TFL)作为甩尾痛阈的指标。结果表明:(1)自然状态下辐射热照尾引起尾核中PEN放电频率增加和PIN放电频率减少与甩尾反射(TF)相伴行。放电变化发生在TF之前,结束在TF之后,PEN和PIN放电变化与TFL呈高度正相关。(2)辐射热照尾同时引起一侧尾核PEN放电频率增加和另一侧PIN放电频率减少,二者协同活动,并发生在TF之前,结束在TF之后。(3)侧脑室注射55μg/10μl吗啡呈镇痛作用时,尾核PEN放电频率减少和PIN放电频率增加,放电变化仍发生在TF之前,结束在TF之后。结果提示,尾核中PEN、PIN放电和TF是中枢不同水平同时对痛觉调制所产生的结果。 相似文献
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7.
Metabolomic approach to evaluating adriamycin pharmacodynamics and resistance in breast cancer cells
Bei Cao Mengjie Li Weibin Zha Qijin Zhao Rongrong Gu Linsheng Liu Jian Shi Jun Zhou Fang Zhou Xiaolan Wu Zimei Wu Guangji Wang Jiye Aa 《Metabolomics : Official journal of the Metabolomic Society》2013,9(5):960-973
Continuous exposure of breast cancer cells to adriamycin induces high expression of P-gp and multiple drug resistance. However, the biochemical process and the underlying mechanisms for the gradually induced resistance are not clear. To explore the underlying mechanism and evaluate the anti-tumor effect and resistance of adriamycin, the drug-sensitive MCF-7S and the drug-resistant MCF-7Adr breast cancer cells were used and treated with adriamycin, and the intracellular metabolites were profiled using gas chromatography mass spectrometry. Principal components analysis of the data revealed that the two cell lines showed distinctly different metabolic responses to adriamycin. Adriamycin exposure significantly altered metabolic pattern of MCF-7S cells, which gradually became similar to the pattern of MCF-7Adr, indicating that metabolic shifts were involved in adriamycin resistance. Many intracellular metabolites involved in various metabolic pathways were significantly modulated by adriamycin treatment in the drug-sensitive MCF-7S cells, but were much less affected in the drug-resistant MCF-7Adr cells. Adriamycin treatment markedly depressed the biosynthesis of proteins, purines, pyrimidines and glutathione, and glycolysis, while it enhanced glycerol metabolism of MCF-7S cells. The elevated glycerol metabolism and down-regulated glutathione biosynthesis suggested an increased reactive oxygen species (ROS) generation and a weakened ability to balance ROS, respectively. Further studies revealed that adriamycin increased ROS and up-regulated P-gp in MCF-7S cells, which could be reversed by N-acetylcysteine treatment. It is suggested that adriamycin resistance is involved in slowed metabolism and aggravated oxidative stress. Assessment of cellular metabolomics and metabolic markers may be used to evaluate anti-tumor effects and to screen for candidate anti-tumor agents. 相似文献
8.
Li Guangwei Jin Jiye Zhou Yan Bai Xufeng Mao Donghai Tan Cong Wang Gongwei Ouyang Yidan 《中国科学:生命科学英文版》2019,62(4):507-516
Mendelian inheritance can ensure equal segregation of alleles from parents to offspring, which provides fundamental basis for genetics and molecular biology. Segregation distortion(SD) leads to preferential transmission of certain alleles from generation to generation. Such violation of Mendelian genetic principle is often accompanied by reproductive isolation and eventually speciation. Although SD is observed in a wide range of species from plants to animals, genome-wide dissection of such biased transmission of gametes is rare. Using nine inter-subspecific rice crosses, a genome-wide screen for SD loci is performed, which reveals 61 single-locus quantitative trait loci and 194 digenic interactions showing distorted transmission ratio, among which 24 new SD loci are identified. Biased transmission of alleles is observed in all nine crosses, suggesting that SD exists extensively in rice populations. 72.13% distorted regions are repeatedly detected in multiple populations, and the most prevalent SD hotspot that observed in eight populations is mapped to chromosome 3. Xian alleles are transmitted at higher frequencies than geng alleles in inter-subspecific crosses, which change the genetic composition of the rice populations. Epistatic interaction contributes significantly to the deviation of Mendelian segregation at the whole-genome level in rice, which is distinct from that in animals. These results provide an extensive archive for investigating the genetic basis of SD in rice, which have significant implications in understanding the reproductive isolation and formation of inter-subspecific barriers during the evolution. 相似文献
9.
Vivi M Thorup Frede Aa Tøgersen Bente Jørgensen Bente R Jensen 《Acta veterinaria Scandinavica》2007,49(1):20
To enable a quantification of net joint moments and joint reaction forces, indicators of joint loading, this study aimed to
locate the mediolateral joint axes of rotation and establish the body segment parameters of the limbs of pigs (Sus scrofa). To locate the joint axes of rotation the scapulohumeral, humeroradial, carpal complex, metacarpophalangeal, coxofemoral,
femorotibial, tarsal, and metatarsophalangeal joints from 12 carcasses were studied. The joints were photographed in three
positions, bisecting lines drawn at fixed landmarks with their intersection marking the joint axes of rotation. The body segment
parameters, i.e. the segment mass, center of mass and moment of inertia were measured on the humerus, radius/ulna, metacarpus,
forepastern, foretoe, femur, tibia, metatarsus, hindpastern, and hindtoe segments from five carcasses. The segments were weighed,
and their center of mass was found by balancing them. The moments of inertia of the humerus, radius/ulna, femur and tibia
were found by rotating the segments. The moments of inertia of the remaining segments were calculated. Generally, the joint
axes of rotation were near the attachment site of the lateral collateral ligaments. The forelimb, with segments taken as one,
was significantly lighter and shorter than the hindlimb (P < 0.001). In all segments the center of mass was located 31 to
50% distal to the proximal segment end. The segment mass decreased with distance from the trunk, as did the segment moment
of inertia. The results may serve as reference on the location of the joint axes of rotation and on the body segment parameters
for inverse dynamic modeling of pigs. 相似文献
10.
Cho SJ Cho PY Lee MS Hur SY Lee JA Kim SK Koh KS Na YE Choo JK Kim CB Park SC 《Development genes and evolution》2003,213(4):207-210
The Hox genes of the oligochaete, Perionyx excavatus, were surveyed using PCR and phylogenetic analysis. We were able to identify 11 different Hox gene fragments. Comparative and phylogenetic analyses revealed that this oligochaete would have at least five Hox genes of the anterior group, including three copies of labial-type, five of the central group and one of the posterior group. This is the first report regarding sequence information and phylogenetic analysis of Hox genes in the earthworm. 相似文献