Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0011570 (depression)
 172,036 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Addition of glucose to cells of the yeast Saccharomyces cerevisiae growing on a nonfermentable carbon source triggers a rapid, transient increase in the cAMP level. The occurrence of this cAMP spike appears to be correlated inversely with the glucose-repression state of the cells. This was also observed for the hex2 mutant, which is deficient in glucose repression and which displayed the cAMP signal constitutively. When cells of the hex2 mutant were starved for nitrogen on a glucose-containing medium, they rapidly lost viability, similarly to mutants with overactivation of the Ras-adenylate cyclase pathway. Flow cytometry measurements showed that G1 arrest of the hex2 mutant under such conditions was incomplete. Trehalose accumulation, a typical feature of cells entering the stationary phase G0, was very short-lived in the hex2 mutant under the same conditions. These results are in agreement with the presence of continuous glucose-triggered activation of cAMP synthesis in hex2 cells on a glucose-containing nitrogen-starvation medium. In the course of these experiments a spontaneous suppressor mutant, shx (for suppressor of hex2), was isolated which survived nitrogen starvation on a glucose-containing medium much better than the hex2 strain. It also showed normal G1 arrest and much longer accumulation of trehalose. The suppressor mutation also caused inability to grow on nonfermentable carbon sources and absence of invertase depression, and it was epistatic to hex2 for these characteristics also. The isolation of this epistatic depression mutation supports the idea that the defect in glucose repression of the hex2 mutant is the cause of its rapid loss of viability during nitrogen starvation on a glucose-containing medium.(ABSTRACT TRUNCATED AT 250 WORDS)
 ...
PMID:Constitutive glucose-induced activation of the Ras-cAMP pathway and aberrant stationary-phase entry on a glucose-containing medium in the Saccharomyces cerevisiae glucose-repression mutant hex2. 755 Oct 24

Resting metabolic rate was measured in rats receiving single or double food portions every day or every other day, adding up to the same total food intakes. Starving rats were also measured. At two different total food intakes, there were no differences between the rats that were fed a meal every day and those fed a double meal every other day. Thus, the time interval between meals does not determine the extent of the metabolic depression. Also, the resting metabolic rates of rats fed various reduced food regimens are very similar to each other and to the resting metabolic rate of starved rats. The results of this study thus indicate that metabolic depression during starvation and severe caloric restriction in rats is an initially uniform response that modulates itself late in the starvation or restriction period in accordance with the total food intake.
 ...
PMID:Influences of time intervals between meals and total food intake on resting metabolic rate in rats. 762 76

Ecotoxicologists and ecologists have examined the effects of pollutants on individuals and populations largely in terms of one or only a few effects. Yet the recent trend toward a holistic approach to ecological risk assessment suggests that a rigorous paradigm should be applied to toxicants, from hazard identification to risk characterization. Recent discussions have recognized that an up-front problem formulation phase is more critical in ecological risk assessment than it is for human health risk assessment. In this article a modified environmental health risk assessment paradigm is used to examine the risk of lead to birds. This risk analysis is largely conceptual, based on laboratory and field data, and incorporates information currently available. The model expands the hazard identification phase to create a target identification phase that includes the identification of receptors, endpoints, relationships, spatial and temporal scales, and indicators. The target identification phase is unique to the particular hazard, species, population, or community being examined. Lead can cause mortality, or can indirectly affect populations through effects on the food base, avian behavior, reproductive success, and recruitment. Lead can (1) decrease the abundance and availability of prey, (2) bioaccumulate in prey causing increased lead toxicosis in predators, or (3) increase prey availability by interfering with its hiding or escape behavior. Moreover, lower abundance of prey can lead to starvation or nutrient deficiencies, which amplify the absorption and retention of lead. Lead also causes decreases in clutch and egg size, mortality of embryos and nestlings, depression of growth, and deficits in behavior that affect survival. Lead decreases migratory behavior, and increases vulnerability to cold stress, hunters, and other predators. Research needs for evaluating the risk of lead in birds include obtaining data on (1) metal dynamics within various tissues as a function of dose and time since initial exposure, (2) low-level effects on embryos, (3) effects on chicks following fledging and in the period prior to recruitment, (4) effects on adult foraging skills and reproductive behavior, and (5) the relationship between effects from exposure in the laboratory and those from exposure in the wild. This latter point is extremely important, particularly if wild birds have other means of ridding the body of lead not available or less apparent to laboratory birds.
 ...
PMID:A risk assessment for lead in birds. 764 27

We previously reported that mevalonate starvation elicited by hydroxymethyl glutaryl coenzyme A (HMG-CoA) reductase inhibitors reduced cholesterol accumulation promoted in murine macrophages by acetylated LDL (AcLDL). In the present study we investigated the cellular mechanism of this effect. Our results indicate that the HMG-CoA reductase inhibitors fluvastatin and simvastatin reduce, in a concentration-dependent manner, more than 50% of the 125I-AcLDL degradation by macrophages. This effect was not due to a decrease of lysosomal enzyme activity, and it was paralleled by the retention of AcLDL-associated cholesteryl ester in the incubation medium. The ability of fluvastatin to inhibit AcLDL degradation was completely overcome by mevalonate and its derivative geranylgeraniol. Evaluation at 4 degrees C of 125I-AcLDL binding to plasma membrane suggested that the inhibitory effect of fluvastatin on lipoprotein catabolism was not due to a decreased expression of scavenger receptors. Fluorescent microscope analysis of cellular internalization of AcLDL labeled with the fluorochrome 3,3'-dioctadecyl indocarbocyanine demonstrated that fluvastatin inhibits lipoprotein endocytosis, an effect reversed by mevalonate. Studies performed with native 125I-LDL indicated that fluvastatin did not inhibit but rather increased the degradation of LDL taken up by the normal LDL receptor. These results exclude a generalized depression of the cellular endocytotic activity by the drug. The ability of fluvastatin to reduce AcLDL catabolism and cholesterol esterification was more pronounced in cholesterol-enriched macrophages compared with normal cells. In conclusion, the present results demonstrate that HMG-CoA reductase inhibitors may reduce the in vitro cholesterol accumulation in macrophages by inhibiting AcLDL endocytosis.
 ...
PMID:HMG-CoA reductase inhibitors reduce acetyl LDL endocytosis in mouse peritoneal macrophages. 767 Sep 49

Plectonema boryanum grows under microaerobic nitrogen starvation conditions by temporal separation of the oxygen-sensitive nitrogen fixation and the oxygen-evolving photosynthesis. During the nitrogen-fixation phase, depression in light-dependent oxygen evolution results from alterations in the stare of QA/QB complex. The reaction centre in photosystem II is not oxidised efficiently. Light dependence of nitrogenase function under such conditions appears to be related to the coupling of photosystem I to endogenous electron donors, such as glycollate. This cyanobacterium provides a natural example of in vivo shift in coupling between the photosystems during nitrogen-fixing growth.
 ...
PMID:Uncoupling of photosystems during light dependent dinitrogen fixation by a non-heterocystous cyanobacterium Plectonema boryanum. 800 13

All dominant models of the eating disorders implicate personality variables in the emergence of weight concerns and the development of specific symptoms such as bingeing and purging. Standardized measures of personality traits and disorders generally confirm clinical descriptions of restricting anorexics as constricted, conforming, and obsessional individuals. A less consistent picture suggesting affective instability and impulsivity has emerged from the assessment of subjects with bulimia nervosa. Considerable heterogeneity exists within eating disorder subtypes, however, and a number of special problems complicate the interpretation of personality data in this population. These include young age at onset, the influence of state variables such as depression and starvation sequelae, denial and distortion in self-report, the instability of subtype diagnoses, and the persistence of residual problems following symptom control.
 ...
PMID:Personality variables and disorders in anorexia nervosa and bulimia nervosa. 804 Apr 75

Dichloroacetate has been shown to have therapeutic effects on sepsis and endotoxin shock and to reduce liver damage in rats intoxicated with ethanol or carbon tetrachloride. In this study, the effect of dichloroacetate on endotoxin hepatitis was investigated. Endotoxin hepatitis was induced by an intraperitoneal coadministration of 50 micrograms/kg lipopolysaccharide from Escherichia coli, and 200 mg/kg D-galactosamine in starved, male Wistar rats. This treatment induced the following changes within 24 hr: an increase in the serum aminotransferase activity, histological alterations of the liver including focal necrosis of liver cells and inflammatory infiltrates, an increase in blood pyruvate and alanine concentrations, and inhibition of starvation ketosis. The intraperitoneal administration of 250 mg/kg dichloroacetate 30 min after the administration of the toxins partially counteracted all of these changes. The administration of dichloroacetate might be useful in coping with hepatic damage as well as lacticemia and cardiovascular depression induced by endotoxins.
 ...
PMID:The limiting effect of dichloroacetate on endotoxin-induced liver damage in starved rats. 814 37

Oxygen consumption was measured in male rats during starvation and during different regimens of restricted feeding and refeeding after starvation. Changes in oxygen consumption and body mass were mostly parallel, but rats with a very reduced food intake displayed the same reduction in oxygen consumption as starved rats, despite the smaller reduction in body mass. Also, rats fed different amounts of food after starvation had different oxygen consumptions, but displayed the same changes in body mass. Two different refeeding regimens with restricted food amounts either induced a further depression of oxygen consumption (i.e. below starvation oxygen consumption), or a stabilizing of oxygen consumption on the level of starvation. The changes in oxygen consumption during restriction and feeding after starvation indicate that reductions in resting metabolic rate may not always be predicted from either body mass change or food intake.
 ...
PMID:Resting oxygen consumption in rats during food restriction, starvation and refeeding. 821 88

Norepinephrine and its metabolites were studied in various body fluids (plasma, urine and cerebrospinal fluid) of patients with anorexia nervosa, bulimia nervosa and healthy young women. The reaction of plasma norepinephrine to different stimuli like orthostatic challenge, test meals, standardized exercise, mental challenge tests etc. were studied. All results indicate a reduced noradrenergic activity in the central and peripheral nervous system of patients with eating disorders. The clinical consequences of these changes are hypotension, bradicardia, hypothermia and depression. Evidence is presented that the reduced activity of the sympathetic nervous system is caused by starvation (anorexia nervosa) or intermittent dieting (bulimia nervosa).
 ...
PMID:Central and peripheral noradrenalin regulation in eating disorders. 873 14

Hepatic lipidosis occurs when lipid mobilized to the liver exceeds lipid leaving the liver via formation of very-low-density lipoproteins or by oxidation. Hepatic lipidosis in cats is associated with overt liver dysfunction. In affected cats, excess lipid is mobilized to the liver because of starvation. Removal of hepatic lipid may be impaired because of protein malnutrition, a relative carnitine deficiency, or oxidative damage to peroxisomes and other hepatic organelles. Hepatic lipidosis occurs in adult cats, and is manifest by signs of weight loss, depression, vomiting, and icterus. Diagnosis is achieved by evaluating laboratory and diagnostic imaging data, in conjunction with a liver biopsy. Aggressive tube feeding is the treatment of choice. With this treatment, survival rates are 60% to 80%.
 ...
PMID:Feline hepatic lipidosis. 905 87


<< Previous 1 2 3 4 5 6 7 8 9 10 Next >>