Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0038187 (starvation)
 24,951 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The effects of bleomycin upon epithelial DNA synthesis have been evaluated in a keratinizing tissue culture line and following topical application on intact mouse epidermis. In both models, bleomycin inhibited epithelial DNA synthesis after prolonged exposure of the tissue to large doses of the polypeptide antibiotic. The effect is probably limited by the penetration of bleomycin through epithelial cell membranes. Inhibition of epidermal DNA synthesis was also observed in non-treated animals subjected to restraint and/or partial starvation. These conditions, which are commonly associated with studies of topical therapeutic agents, must, therefore, be carefully controlled.
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PMID:Bleomycin: effects upon mammalian epidermal DNA synthesis. 7 1

1) Thyroidectomized rats were fed with a low iodine diet, injected daily with 0, 0.1, 1.8 or 25 microgram of L-thyroxine/100 g body wt., and compared with intact controls. 2) Plasma protein-bound iodine was decreased in the rats given the 0 and 0.1 microgram doses, unchanged in those given the 1.8 microgram doses, unchanged in those given the 1.8 microgram dose increased in those given the 25 microgram one. 3) The liver content of DNA-P, phospholipid-P, proteins and fatty acids was decreased in the rats that did not receive thyroxine, practically recuperated in those receiving 0.1 microgram and normal in those given 1.8 or 25 microgram of thyroxine. 4) 3 h of starvation produced a reduction in the liver content of total fatty acids that disappeared after 24 h. 5) When fed, liver glycogen concentration was low in the rats given 25 microgram of thyroxine. 6) With starvation, the fall in liver glycogen and blood glucose, and the rise in liver acetyl-CoA and citrate and blood glycerol concentrations were faster in the thyroidectomized rats that did not receive thyroxine than in the other groups. 7) The rise in plasma free fatty acid and blood ketone bodies concentrations were similar in all the groups, the greater level of the first parameter being observed after 6 h of starvation in the rats given 25 microgram of thyroxine and in the second one after 24 h in the rats given either 0.1, 1.8 or 25 microgram of thyroxine. 8) The rapid decrease in the availability of carbohydrate stores with starvation in the thyroidectomized rats could be responsible for their fast call for lipid utilization. The slower response to fasting in the hyperthyroid animals is probably a consequence of their reduced amount of endogenous substrates to be mobilized.
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PMID:Metabolic response to short periods of starvation in hypo- and hyper-thyroid male rats. 7 35

Out of different azapyrimidines tested for their ability to affect metabolism of orotic acid in the liver of rats kept on food only 5-azacytidine resulted in the enhanced incorporation of orotate into liver RNA following 24 hr pretreatment. Similar effect was observed also in cycloheximide-treated animals. No stimulation of orotic acid utilization following 5-azacytidine or cycloheximidine treatment was observed in the liver of starved animals. Both drugs (but not other pyrimidine analogues tested) depressed markedly gastric secretion in rats and caused decreased evacuation of the stomach. The decreased secretion of pepsin and lower gastric acidity resulting in drug-simulated starvation of the treated animals are discussed in relation to the enhanced uptake of orotic acid into liver RNA.
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PMID:Lower gastric secretion and higher incorporation of orotic acid into liver RNA in rats treated with 5-azacytidine and cycloheximide. 7 86

A method is introduced for the assay of alkaline phosphatase in homogenates of cultured human skin fibroblasts. In a first group of 11 strains, a four- to fifteen-fold increase of enzyme activity is consistently observed following a period of starvation. In the remaining 31 cell-strains similar specific activities of alkaline phosphatase are found irrespective of medium changes. In regularly fed cultures, an inverse exponential correlation between the specific activity of alkaline phosphatase and the age of the donor has been detected.
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PMID:Akaline phosphatase: activity and variation in human diploid fibroblasts. 8 60

The effect of mazindol (1 mg/day) on some metabolic and regulatory values was investigated in ten adult obese women and compared with the same number of controls during weight reduction in hospital (a five-times repeated cycle of 5 days complete starvation and 3 days on a 500 kcal(2.1MJ/day diet.) Mazindol caused a rise of hydroxyacyl CoA dehydrogenase in striated muscle by 70 per cent and a marked decline in malic dehydrogenase. Mazindol also produced higher levels of non-esterified fatty acids--significantly higher during the fifth starvation period; a small decrease in blood glucose, IRI and glucose/IRI ratio being unaffected, a significantly two-fold greater decrease of serum cholesterol; a significant increase of the noradrenaline elimination compared with a decrease in controls and in increase in triiodothyronine binding globulin towards the upper range of normal.
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PMID:The effect of mazindol on metabolic and regulatory changes in obese women during weight reduction. 9 88

Cells of Rhodospirillum rubrum were grown photoorganotrophically and chemoorganotrophically and then starved for organic carbon and combined nitrogen under four conditions: anaerobically in the light and dark and aerobically in the light and dark. Illumination prolonged viability and suppressed the net degradation of cell material of phototrophically grown cells, but had no effect on chemotrophically grown cells that did not contain bacteriochlorophyll. The half-life survival times of carbohydrate-rich phototrophically grown cells during starvation anaerobically or aerobically in the light were 17 and 14.5 days, respectively. The values for starvation aerobically and anaerobically in the dark were 3 and 0.5 days, respectively. Chemotrophically grown cells had half-life survival times of 3 and 4 days during starvation aerobically in the light and dark, respectively, and 0.8 day during starvation anaerobically in the light or dark. Of all cell constituents examined, carbohydrate was most extensively degraded during starvation, although the rate of degradation was slowest for phototrophically grown cells starved anaerobically in the light. Phototrophically grown cells containing poly-beta-hydroxybutyrate as carbon reserve were less able to survive starvation anaerobically in the light than were carbohydrate-rich cells starved under comparable conditions. Light intensity had a significant effect on viability of phototrophically grown cells starving anaerobically. At light intensities of 320 to 650 lx, the half-life survival times were 17 to 24 days. At 2,950 to 10,500 lx, the survival times decreased to 1.5 to 5.5 days. The kinetics of cell death correlated well with the rate of loss of cell mass of starving cells. However, the cause of death could not be attributed to degradation of any specific cell component.
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PMID:Viability and endogenous substrates used during starvation survival of Rhodospirillum rubrum. 9 87

The cyanobacterium Plectonema boryanum (IU 594-UTEX 594) fixes N2 only in the absence of combined N and of O2. We induced nitrogenase by transfer to anaerobic N-free medium and studied the effect of Mo starvation on nitrogenase activity and synthesis. Activity was first detected within 3 h after transfer by the acetylene reduction assay in controls, increasing for at least 25 h. Cells grown on nitrate and Mo and then transferred to N-free, Mo-free medium produced 8% of the control nitrogenase activity. Addition of W to the Mo-free medium reduced the activity to 0.5%. Under both Mo starvation conditions, nitrogenase protein components were synthesized. Component II of the cyanobacterial enzyme was detected by in vitro complementation with Mo-containing component I from Klebsiella pneumoniae or Azotobacter vinelandii but not Clostridium pasteurianum. Component I activity was restored by addition of Mo to cultures in which new enzyme synthesis was blocked by chloramphenicol. Acidified extracts of Plectonema induced in Mo-containing medium contained the Fe-Mo cofactor required to activate extracts of the Azotobacter mutant UW45 in vitro, but they did not activate extracts of Mo-starved Plectonema. Analysis of 35SO4(2-)-labeled proteins by polyacrylamide gel electrophoresis suggested that Mo is required for the conversion of a high-molecular-weight precursor to component I in Plectonema.
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PMID:Molybdenum independence of nitrogenase component synthesis in the non-heterocystous cyanobacterium Plectonema. 9 92

Anacystis nidulans was grown photoautotrophically in a chemostat in the presence of light, air and CO2 as the sole carbon source. Either the amount of the nitrogen source in the medium or light intensity were used as growth-limiting parameters. 1. Cells of high glycogen content obtained by pre-incubation under nitrogen starvation conditions maintained their glycogen content during continuous cultivation. Both growth rate and the amount of cell-mass and of glycogen depended on the nitrate content of the medium and the light intensity. The values for the growth rate, the maximal rates of glycogen synthesis and of cell mass formation were 0.1 h-1, 6 mg/l.h and 17 mg/l.h, respectively. 2. Cells without glycogen which had been transferred from an exponentially growing batch culture to chemostat conditions showed increasing rates of growth and of cell mass formation when the light intensity was increased. A determination of specific values resulted in 0.15 h-1 for growth rate and 23 mg/1.h for cell mass formation. 3. The chemostat apparatus is described in detail.
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PMID:Continuous cultivation in a chemostat of the phototrophic procaryote, Anacystis nidulans, under nitrogen-limiting conditions. 9 28

In order to obtain or maintain a good nutritional status in cancer patients, it is often necessary to perform intravenous nutrition. In summary, several studies have indicated that intravenous nutrition may be beneficial in association with surgery, radiation, or chemotherapy in patients with cancer. More controlled studies, however, are required. There is no indication at the present time of any adverse effects of this method of treatment in relation to tumor growth. The general nutritional improvement in patients on intravenous nutrition increases the immunocompetence, resistance to radiation and cytostatic as well as the mood and quality of life of the cancer patients. In very broad terms this new intravenous nutrition therapy means that a cancer patient should not be left without specific cancer therapy because of starvation and its serious or even fatal complications.
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PMID:[General aspects concerning the intravenous feeding of cancer patients]. 9 20

Ribosomal RNA is synthesized at constant rate during most of the cell cycle in heat-shock synchronized populations of Tetrahymena pyriformis. Early in each macronuclear S-period the rate of synthesis increases abruptly, concomitant with replication of the genes coding for ribosomal RNA. The increase is prevented by inhibitors of DNA replication, added prior to the S-period. Similarly, in cultures synchronized by starvation/refeeding, inhibition of DNA replication, at the time when the rDNA is replicated, will prevent the normal increase in rate of RNA synthesis which follows refeeding. We conclude that inhibition of rDNA replication interferes with the synthesis of rRNA, and we suggest that with respect to rRNA synthesis a gene dosis effect is operating in fast-growing Tetrahymena cells.
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PMID:Regulation of ribosomal RNA synthesis in Tetrahymena pyriformis. 9 2


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