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71.
The interrelationship between the inhibition of cell growth and changes in phospholipid molecular species was studied in the presence of elaidic, trans-11-eicosenoic, or brassidic acids in Chinese hamster V79-R cells. The addition of trans-monoenoic fatty acids to the medium inhibited cell growth and caused an increase in the total cellular content of phospholipids. However, there was no difference in the polar head group composition of these phospholipids among all the cells supplemented with trans-monoenoic fatty acids. Exogenous trans-monoenoic fatty acids were incorporated into cellular phospholipids to form novel phospholipid molecular species. Phospholipid synthesizing enzyme activities bound to the membranes composed of phospholipid molecular species of trans-monoenoic fatty acids were determined. Cholinephosphotransferase [EC 2.7.8.2] and ethanolaminephosphotransferase [EC 2.7.8.1] activities were decreased by trans-11-eicosenoic acid, but not changed by elaidic acid. Glycerophosphate acyltransferase [EC 2.3.1.15] activity was increased by elaidic acid and decreased by trans-11-eicosenoic acid. Cholinephosphate cytidylyltransferase [EC 2.7.7.15] activity was not changed by trans-monoenoic fatty acids. 相似文献
72.
T Moriyama H Takamura H Narita K Tanaka T Matsuura M Kito 《Journal of biochemistry》1988,103(6):901-902
The thromboxane A2 antagonist, ONO-3708, completely inhibited the increase in cytosolic free Ca2+ in human platelets during activation with collagen. Half-maximal Ca2+ release and influx required about 3 and 4 nM STA2, a stable thromboxane A2 mimetic, respectively. However, half maximal activation of phospholipase C required about 18 nM STA2. This suggests that thromboxane A2 directly causes Ca2+ mobilization without further activation of phospholipase C during activation of human platelets with collagen. 相似文献
73.
Brown holo-membrane was prepared by the addition of all-trans-retinal to brown apo-membrane which was isolated from Halobacterium halobium grown in the presence of nicotine. The effects of pH and NaCI concentration on the absorbance spectrum of the brown holo-membrane were investigated in comparison with those of the purple membrane. The λmax of the dark-adapted brown holo-membrane shifted from 560 to 600 nm by lowering pH. The pK value which was determined as the mid-point pH for the spectral red-shift was 5.8 in the absence of NaCl. It was lowered to 4.5 and 3.4 in 0.1 and 1 M NaCl solutions, respectively. The pK value for the brown holo-membrane was larger than the corresponding value for the purple membrane in the NaCl solution. Bacteriorhodopsins present in the purple membrane and in the brown holo-membrane were solubilized in the nonionic detergent, lauryl ester of sucrose. For both solubilized bacteriorhodopsins, the pK value of spectral red-shift was about 3.1 in water, and the pI value, determined by chromatofocusing, was about 4.6 at 22°C. 相似文献
74.
Rie Miyoshi Shozo Kito Hajime Ishida Mika Nakashima 《Neurochemistry international》1989,15(4):493-496
The effect of neurotensin on binding characteristics of dopamine D1 receptors was examined in the rat striatal membranes through radioreceptor assay. Neurotensin or its analogs were added to incubation medium of[3H]SCH 23390 saturation or dopamine/[3H]SCH 23390 inhibition experimental systems. Neurotensin did not modulate D1 antagonist binding but converted a part of D1 agonist high affinity binding sites to a low affinity state. Neurotensin8–13 had the same potency as neurotensin itself, whereas neurotensin1–8 had only weak activity in modulating D1 agonist binding. GTP and neurotensin had the same effect on D1 agonist binding. However, when both neurotensin and GTP were added, the result was the same as with either alone.
These data suggest that neurotensin modulates the functional state of D1 receptors probably via a GTP binding protein in the rat striatum. 相似文献
75.
76.
Highly sensitive assay method of L-gulono-gamma-lactone oxidase (GLO) was constructed. In this method, L-ascorbic acid formed in the enzymatic reaction was converted to its bis(dinitrophenyl)hydrazone derivative, and the amount of the latter was determined by high-performance liquid chromatography. Twenty picomoles of ascorbic acid was detected, which makes this method 25 times more sensitive than the previously used dipyridyl one. By the present method, a minute activity of GLO in liver microsomes prepared from rats of the Osteogenic Disorder Shionogi strain (ODS-od/od) could be measured. 相似文献
77.
Kei Sasaoka Makoto Kito Yoriko Onishi 《Bioscience, biotechnology, and biochemistry》2013,77(11):984-988
Characterization of the theanine synthesizing enzyme found in tea seedlings was carried out. Evidences suggest that this enzyme seems to be a synthetase peculiar to the tea plant, having a high affinity for ethylamine. 相似文献
78.
Makoto Kito Masataka Ishinaga Tadao Hata 《Bioscience, biotechnology, and biochemistry》2013,77(2):565-566
The title compounds were synthesized from starting materials of microbial origin by employing a Wittig reaction as the key step. 相似文献
79.
When human platelets (5 X 10(8)/ml) were stimulated by a threshold concentration of collagen (2 micrograms/ml), a lag period of about 60 s was seen before the initiation of release reaction and aggregation. Breakdown of [32P]phosphatidylinositol 4,5-bisphosphate was seen within 10 s after the addition of collagen. The concentration of intracellular free Ca2+ (monitored by Quin II) rose from 80 nM to 145 nM within 10 s after stimulation by collagen. However, a lag period of about 50 s remained. The rise was not blocked by indomethacin. It was supposed that the initial Ca2+ mobilization by myo-inositol 1,4,5-trisphosphate was too small to cause aggregation. Thromboxane A2 was gradually accumulated during the lag period and then abruptly increased in parallel with aggregation. These events were completely inhibited by 10 microM indomethacin. Thus, aggregation appeared to be dependent on the generation of thromboxane A2. Addition of 25 nM A23187 at 10 s after stimulation by collagen shortened the lag period before initiation of the abrupt thromboxane A2 generation, secretion and aggregation, whereas 25 nM A23187 could not cause these reactions in the absence of collagen. Accordingly, the lag period is assumed to be required for accumulation of free Ca2+ to the threshold for aggregation of platelets. It is considered that thromboxane A2 plays a central role in Ca2+ mobilization during stimulation of human platelets by collagen. 相似文献
80.