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1.
Cycloheximide, when injected subcutaneously or intracerebrally, produces changes in the activity level of mice. Isocycloheximide, injected intracerebrally, produces identical effects on activity, but it does not produce inhibition of cerebral protein synthesis or amnesia. Amphetamine, in doses that can antagonize the amnesic action of cycloheximide, does not antagonize the effect of cycloheximide on activity. Effects of cycloheximide on activity do not appear to be responsible for its amnesic action. 相似文献
2.
Tolerance and physical dependence development to morphine in mice can be prevented by concomitant administration of cycloheximide. The fact that the rate of synthesis of brain 5-hydroxytryptamine (5HT) increases with tolerance to morphine suggests that the protein involved may be associated with 5HT synthesis. Inhibition of this synthesis with p-chlorophenylalanine markedly decreases tolerance and physical dependence development to morphine. 相似文献
3.
Electroshock effects on brain protein synthesis: relation to brain seizures and retrograde amnesia 总被引：5，自引：0，他引：5
The effects of electroshock on brain seizure activity and brain protein synthesis were studied in male mice. A significant but short-lasting inhibition of brain protein synthesis and an increase in the amount of free leucine were produced by electroshock at intensities above the brain seizure threshold. Electroshock at intensities below the brain seizure threshold did not affect brain protein synthesis. 相似文献
4.
Homing salmon were injected intracranially with puromycin, actinomycin D, or cycloheximide. From 4 to 7 hours after such treatment these agents markedly inhibited olfactory bulbar discrimination between home water and other natural waters, including spawning sites for other groups of salmon. At longer intervals after treatment there was a partial restoration of olfactory memory-based discrimination. The dosages of the inhibitors used could be shown to have depressed incorporation of H(3)-leucine into protein by 78 percent or of H(3)-uridine into RNA by 41 percent in the salmon brains 4 hours after intracranial injection. These findings suggest that acute blockage of RNA synthesis or protein synthesis can interfere with long-term olfactory memory in anadromous salmon, at least as this function can be analyzed by electrophysiological methods. This implies that long-term olfactory memory depends upon continued metabolism of RNA and continued protein synthesis. 相似文献
5.
Amnesia produced by electroconvulsive shock or cycloheximide: conditions for recovery 总被引：3，自引：0，他引：3
Retrograde amnesia for a passive avoidance response was produced in rats by electroconvulsive shock and in mice by cycloheximide, an inhibitor of protein synthesis. One day after training the memory could be restored if a "reminder" of the original foot shock was given after the retention test on which the amnesia was demonstrated. Memory did not return if the reminder was given without the prior retention test or if the reminder and the test were separated by 23 hours. 相似文献
6.
Turnover of rat liver tyrosine transaminase: stabilization after inhibition of protein synthesis 总被引：39，自引：0，他引：39
F T Kenney 《Science (New York, N.Y.)》1967,156(774):525-528
Turnover of the rat liver tyrosine transaminase in vivo was measured by a label and chase procedure under conditions where the amount of enzyme undergoes no change. Half-life of the (14)C-labeled enzyme in this basal condition was found to be 1.5 +/- 0.3 hours. Inhibitors of protein synthesis (cycloheximide or puromycin) do not appreciably influence the basal enzyme level over a 5-hour period, although these drugs will block hormonal induction of this enzyme. In pulse-labeling experiments, cycloheximide blocked transaminase synthesis almost completely. The conclusion that enzyme degradation, as well as synthesis, must be blocked when protein synthesis is stopped was confirmed in experiments showing that labeled enzyme is stable in the liver of rats treated with cycloheximide The participation of a continuously synthesized polypeptide in the degradative phase of transaminase turnover is suggested. 相似文献
7.
Inhibition of serum- and ras-stimulated DNA synthesis by antibodies to phospholipase C 总被引：17，自引：0，他引：17
Several immunologically distinct isozymes of inositol phospholipid-specific phospholipase C (PLC) have been purified from bovine brain. Murine NIH 3T3 fibroblasts were found to express PLC-gamma, but the expression of PLC-beta was barely detectable by radioimmunoassay or protein immunoblot. A mixture of monoclonal antibodies was identified that neutralizes the biological activity of both endogenous and injected purified PLC-gamma. When co-injected with oncogenic Ras protein or PLC-gamma, this mixture of antibodies inhibited the induction of DNA synthesis that characteristically results from the injection of these proteins into quiescent 3T3 cells. However, when oncogenic Ras protein or PLC-gamma was co-injected with a neutralizing monoclonal antibody to Ras, only the DNA synthesis induced by the Ras protein was inhibited--that induced by PLC was unaffected. These results suggest that the Ras protein is an upstream effector of PLC activity in phosphoinositide-specific signal transduction and that PLC-gamma activity is necessary for Ras-mediated induction of DNA synthesis. 相似文献
8.
Induction of choline phosphotransferase and lecithin synthesis in the fetal lung by corticosteroids 总被引：8，自引：0，他引：8
Rabbit fetuses 23 to 24 days of gestation were injected with either 9-fluoroprednisolone acetate or saline. Three days later the lungs of steroid-treated animals showed a significant increase in lecithin concentration and cholinephosphotransferase activity. In addition, lung slices from these animals incorporated more [(14)C]choline into lecithin. The rise in enzyme activity and [(14)C]choline incorporation was blocked by prior treatment of fetuses with cycloheximide but not by treatment with actinomycin D. It is proposed that the corticosteroids induce de novo synthesis of the lung enzyme, which in turn leads to increased synthesis of lecithin through the choline incorporation pathway. Furthermore, it appears that the site of regulation involves translation of messenger RNA. 相似文献
9.
[目的]对比狂犬病毒固定强毒株CVS-24、广西街毒株GX074、弱毒株rRC-HL和重组毒株rRC-HL△G感染小鼠后的临床症状及脑组织病理学变化,为揭示狂犬病毒的致病机理提供参考依据.[方法]将CVS-24、GX074、rRC-HL和rRC-HL△G分别通过脑内注射SPF级昆明小鼠,以注射DMEM为对照,每只小鼠注射30μL,攻毒后连续观察测量小鼠的体重和死亡情况,采取濒临死亡小鼠的脑组织制作石蜡切片,经HE染色后观察脑组织的病理变化.[结果]与DMEM组的小鼠相比,rRC-HL组小鼠攻毒后的体重先下降后恢复正常,而其他攻毒组小鼠的体重迅速下降直至死亡.DMEM组和rRC-HL组的小鼠在整个试验周期内未见死亡;CVS-24组、GX074组和rRC-HL△G组的小鼠在攻毒后全部发病死亡,其中,CVS-24组小鼠出现死亡的时间最早(攻毒后第5 d),且在攻毒后第6 d全部死亡.通过观察小鼠脑组织的病理学变化,发现rRC-HL组小鼠脑组织的炎症反应最严重,其神经纤维紊乱,神经元细胞变形,细胞边缘不清晰,少量细胞固缩甚至消失,海马回神经胶质细胞浸润,嗜神经现象明显,血管套现象严重;rRC-HL△G组次之;GX074组和CVS-24组小鼠的脑组织病变轻微,可见少量嗜神经现象.[结论]rRC-HL△G、GX074和CVS-24等3株狂犬病毒强毒株的临床症状更明显,发病死亡率达100%,但与弱毒株相比,其炎症反应较轻微,说明狂犬病毒强毒株可能是通过抑制机体脑组织中促炎因子的产生而抑制炎症反应出现,阻断其固有免疫反应,不利于机体对病毒的清除. 相似文献
10.
It was recently reported that cycloheximide, an inhibitor of protein synthesis, induces tyrosine transaminase in the liver of adrenalectomized rats. We have been unable to confirm this effect in the anesthetized animal and our data show that cycloheximide inhibits the induction caused by hydrocortisone in adrenalectomized rats or by stress in intact rats. 相似文献
11.
A single injection of l-phenzylalanine in 7-day-old rats produtced disaggregation of brain polyribosomties and inhibition of in vitro protein synthesis in cell-free systems prepared from brain. Liver polyribosomes and in vitro protein synthesis in hepatic systems were not affected. In 4-week-old rats these effects on brain protein synthesis did not occur. 相似文献
12.
Small doses of cycloheximide given at intervals (pulses) cause phase shifts of the circadian clock of Neurospora. The effects of this drug on the clock are mediated through its inhibition of protein synthesis, since two cycloheximide-resistant mutants whose 80S ribosomes are resistant to cycloheximide showed no phase shift after exposure to the durg. 相似文献
13.
为了探讨柠檬酸对机体的毒副作用,选用昆明系健康雄性小鼠40只,随机分成4组,每组10只,饲养1周后,腹腔注射一定剂量的生理盐水及低(180mg·kg-1)、中(270mg·kg-1)、高(360mg·kg-1)质量浓度的柠檬酸溶液.每周注射1次,连续注射3周,第3次注射后的第7天,所有小鼠均颈椎脱臼处死,采取小鼠的脑组织分别于液氨和-20℃各保存1份备用.通过RT-PCR法和ELISA法分别检测小鼠脑组织中bcl-2基因表达水平和蛋白表达量.结果显示,柠檬酸处理组与对照组相比,bcl-2基因表达水平均无统计学上的差异(P＞0.05)；中剂量柠檬酸处理时,bcl-2蛋白的表达量达到最高值,且与对照组呈现显著差异(P＜0.05),上升了23％,柠檬酸高剂量组与中剂量组相比,bcl-2蛋白的表达量呈显著降低(P＜0.05)；其它组间均无统计学上的差异(P＞0.05).说明腹腔注射270mg·kg-1的柠檬酸可显著提高小鼠脑组织bcl-2蛋白的表达量；但本试验设置的柠檬酸梯度对bcl-2基因表达水平无显著影响. 相似文献
14.
在氮素诱导下,进行甜菜谷氨酰胺合成酶(GS)活性的测定,筛选出最佳的氮素诱导处理,研究核酸合成抑制剂放线菌素D和蛋白合成抑制剂放线菌酮对GS在酶活水平上的表达调控。结果表明,NO3-:NH4+=80:20处理时,GS活性最高,并且在此处理下放线菌素D和放线菌酮均能抑制GS活性。说明甜菜GS的表达可能在转录水平和翻译水平上均受到调控。 相似文献
15.
Insulin biosynthesis: evidence for a precursor 总被引：48，自引：0，他引：48
Human islet cell tumor tissue and isolated islets of Langerhans from rats incorporated radioactive amino acids in vitro into insulin and a larger acid-alcohol soluble protein which could be separated from insulin by gel filtration. The amino acids were incorporated into the larger protein earlier than into insulin; only after incubation of islets for approximately 30 minutes did radioactivity begin to appear in insulin. The transfer of about 70 percent of the radioactivity of the larger protein to insulin was demonstrated in the absence of new peptide bond synthesis (cycloheximide), or during incubation with unlabeled amino acid (chase). The results indicate that the larger protein is a precursor in the biosynthesis of insulin. The name "proinsulin" is suggested for this protein. 相似文献
16.
Collagen synthesis in Xenopus oocytes after injection of nuclear RNA of frog embryos 总被引：1，自引：0，他引：1
A messenger RNA fraction from polysomes of frog larvae or RNA preparations from isolated nuclei of developing frog embryos were injected into growing Xenopus laevis oocytes that were incubated with labeled proline. Column chromatography of protein hydrolyzates revealed labeled hydroxyproline after injection of the messenger RNA fraction and neurula nuclear RNA, indicating that the injected material had promoted collagen synthesis. 相似文献
17.
以牛脑为材料利用纤维素色谱法纯化钙调蛋白，配制成有活性成分的药物，腹腔注射随机分组的小白鼠，研究钙调蛋白对小白鼠血糖的影响。结果表明，钙调蛋白对采食后小白鼠的血糖具有降低作用。 相似文献
18.
《东北农业大学学报(英文版)》2016,(4):61-66
The aim of the study was to assess effect of the atipamezole on talezol/xylazine induced expression of c-fos in rat brain. Rats were injected with the mixture of 13.81 mg · kg~(-1) telazol and 5.21 mg · kg~(-1) xylazine, following 10 min later0.522 mg · kg~(-1) atipamezole injected, and then the cerebral cortex and thalamencephal were removed at 1 h after injected. Level of Fos protein was measured in the brain tissue by western-blot. The results revealed that telazol/xylazine induction Fos protein expression in the thalamencephal and cerebral cortex during the period of anesthesia, atipamezole attenuated telazol/xylazine induction Fos protein expression in the thalamencephal and cerebral cortex. The results indicated that atipamezole could inhibite telazol/xylazine-induced c-fos expression in the rat brain, and played a protective role of neuronal injury. 相似文献
19.
[目的]为深入了解孕酮的蛋白质合成作用奠定基础。[方法]用不同浓度孕酮处理雌性小白鼠,测定其不同器官内不同分子量范围蛋白质的相对含量,探讨孕酮对雌性小白鼠不同组织器官蛋白质合成作用的影响。[结果]不同组织器官内蛋白质主要集中在25～75 kD,而不同浓度的孕酮对雌性小白鼠不同组织器官内蛋白质含量有明显影响。[结论]孕酮诱导子宫、肾上腺和垂体下丘脑上75～250 kD蛋白的合成,诱导垂体下丘脑上15～25 kD蛋白的合成,抑制子宫、肾上腺和垂体下丘脑25～75 kD蛋白的合成。 相似文献
20.
Hemagglutinin variants of reovirus type 3 have altered central nervous system tropism 总被引：22，自引：0，他引：22
Variants of the Dearing strain of reovirus type 3 with antigenically altered hemagglutinin proteins are much less neurovirulent than the parental virus. When injected intracerebrally into mice these variants infected a subset of the brain neurons that were infected by the parental virus. When injected intraperitoneally, the variants did not spread to the brain. These results indicate that minor modifications of the reovirus hemagglutinin dramatically alter the ability of the virus to spread into and injure the central nervous system. 相似文献