Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0020505 (hyperphagia)
 6,116 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Injection of 2-deoxy-D-glucose (2DG) elicits both analgesic and hyperphagic responses in rats. While pituitary dysfunction, decreased dopamine availability, or neonatal monosodium glutamate treatment decreases 2DG hyperphagia, they increase 2DG analgesia. In contrast, 2-DG analgesia alone is decreased by repeated 2-DG injections, while 2-DG hyperphagia alone is decreased following naloxone pretreatment. The present four experiments examined further mechanisms subserving these two induced responses. In the first experiment, rats were deprived of food for 6 h following 2-DG (600 mg/kg). While 2-DG hyperphagia persisted in the absence of glucoprivation, 2-DG analgesia failed to occur after this delay. In the second experiment, acute exposure to inescapable foot shock (4 mA, 0.5 s/5 s for 1 h) preceded administration of 2-DG (600 mg/kg). While 2-DG hyperphagia was eliminated by this procedure, 2-DG analgesia was significantly potentiated. In the third experiment, repeated morphine (10 mg/kg) injections over 14 days eliminated 2-DG analgesia on the fifteenth day, but failed to affect 2-DG hyperphagia. In the fourth experiment, lesions placed in either the lateral hypothalamus or zona incerta decreased 2-DG hyperphagia, but failed to affect 2-DG analgesia. These results are discussed in terms of common and dissociative mechanisms mediating both responses.
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PMID:Dissociation of analgesic and hyperphagic responses following 2-deoxy-D-glucose. 658 11

The hyperphagia/obesity syndrome produced by paraventricular hypothalamic (PVH) lesions and that produced by medial hypothalamic (MH) knife cuts were compared in adult female rats. Each treatment produced hyperphagia and overweight on a chow diet, although the PVH effect was less than the knife-cut effect. Each treatment also produced qualitatively similar ingestive responses to unpalatable quinine- and sucrose octaacetate-adulterated diets and to palatable dextrose and fat diets during the dynamic and static weight-gain phases. The PVH lesions and MH cuts disrupted day/night feeding patterns and elevated water intakes but not water/food intake ratios. However, PVH lesions, unlike MH cuts, did not increase emotional reactivity. The relation of the PVH syndrome to the classic hypothalamic hyperphagia syndrome is discussed. Also considered is the neuroanatomical substrate responsible for the PVH hyperphagic effect.
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PMID:Paraventricular hypothalamic lesions and medial hypothalamic knife cuts produce similar hyperphagia syndromes. 665 67

Neonatal administration of monosodium glutamate (MSG) produces in rats neurotoxic degeneration of the circumventricular system, including the medial-basal hypothalamus, depleting several neuropeptides and neurotransmitters in this area. In addition, a number of behavioral and neuroendocrine responses are impaired, including a significant decrease in the analgesic response to cold-water swims (CWS). The present study examined whether the alterations in the analgesic responses following CWS and 2-deoxy-D-glucose (2-DG) induced by neonatal MSG treatment were due either to direct alterations in a pain-inhibitory system, or alternatively, to alterations in a system that processes the stressful consequences or properties of a stimulus. To accomplish this, the analgesic, hypothermic, and locomotor responses following CWS and the analgesic, hyperphagic, and locomotor responses following 2-DG were assessed in rats treated neonatally (days 2, 4, 6, 8, and 10) with either MSG or a vehicle solution. MSG-treated rats displayed significant reductions in both their analgesic and hypothermic responses following CWS, suggesting that MSG treatment impairs an animal's ability to process sufficiently the stimulus properties of the swim as stressful. While MSG treatment potentiated 2-DG analgesia, it reduced 2-DG hyperphagia, suggesting that MSG treatment also impairs coping responses to glucoprivation. These data indicate the importance of the circumventricular system in the coding of stimuli as potential stressors and in the subsequent activation of requisite systems necessary to provide a sustained, coordinated, and synchronous coping response.
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PMID:Impairments in analgesic, hypothermic, and glucoprivic stress responses following neonatal monosodium glutamate. 673 8

The ingestive responses of rats given celiac vagotomy (C), combined celiac and hepatic vagotomy (CH), or low total vagotomy (removal of all tissue from around the esophagus, stomach and duodenum; LT) were compared with sham operated controls (S) in a series of regulatory challenges. The vagotomized groups responded normally to 2-deoxy-D-glucose (2DG; 125, 250, 500 mg/kg, IP), insulin (4, 8, 12 U/kg, IP), and polyethylene glycol (10 ml/kg: 30% w/v, SC), but displayed attenuated responses to epinephrine (40, 80, 120 micrograms/kg, IP) and hypertonic saline (10 ml/kg: 0.25, 0.5, 1.0 M, IP). These results can be interpreted as evidence that the celiac vagus carries a major component of hepatic afferent innervation. Additionally, when considered with other findings they suggest that whereas the anorectic activity of epinephrine is mostly confined to the liver, 2DG hyperphagia involves stimulation of a wider population of peripheral metabolic receptors.
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PMID:Celiac vagotomy attenuates the ingestive responses to epinephrine and hypertonic saline but not insulin, 2-deoxy-D-glucose, or polyethylene glycol. 675 89

Several pre- and post-natal factors possibly important in determining which infants will develop necrotizing enterocolitis (NEC) and which of these infants will die with this disease were prospectively studied in 1976 in 11 infants with radiographic or pathologic evidence of the disease from 12 institutions in the United States and 111 weight-matched, institution-matched control infants. By multivariant discriminant analysis, the authors idenfitied 10 independent significant determinants of NEC and 10 determinants predictive of a fatal outcome among case infants. Determinants of NEC were: Apgar score deterioration; presence of a patent ductus arteriosus; maternal receipt of anesthesia during delivery; infant not treated with parenteral gentamicin before the onset of disease; infant receipt of 10% dextrose solution; treatment of mother with antibiotics during pregnancy; hyperalimentation or gavage feedings; premature rupture of membranes. Important morbid events among cases included red blood cell transfusions, gas in the portal system, premature rupture of membranes, abdominal distension, isolation of Klebsiella organisms from the blood, surgery, prolonged perinatal oxygen requirement, and lower Apgar 2 score. Attempts to modify preventable risk factors may decrease the incidence (2.4 cases per 1000 live births) and case fatality (41%) documented in this study.
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PMID:Necrotizing enterocolitis: a prospective multicenter investigation. 677 21

Malnutrition is associated with an increased susceptibility to infection by altering host defense mechanisms. A number of investigators have demonstrated restoration of in vitro immunocompetence following nutritional repletion with intravenous hyperalimentation. This study was designed to assess in vivo host defense mechanisms following protein depletion and repletion using a septic challenge. Female Fischer rats (150 gm) were fed a regular diet or a 2% agar protein depletion (DEP) diet for 14 days. The rats were then administered an infectious challenge with intraperitoneal injections of 7 ml/kg of a solution of 10(9) organisms/ml of E. coli with 4 gm% hemoglobin as red cells. Two additional organisms were repleted by regular diet (DEP-Oral) or by an intravenous solution (DEP-TPN) of dextrose-amino acid-lipid (D25 3.75% Aminosyn, 10% Intralipid) for an additional 2-week period, and given the experimental peritonitis challenge. Normal rats challenged with E. coli-hemoglobin adjuvant peritonitis had 66% survival as opposed to 15% survival of protein depleted rats. Protein-depleted (DEP-oral) rats refed with regular diets had a 60% survival which was comparable to normal controls. Rats repleted with intravenous hyperalimentation had a mortality comparable to protein-depleted controls. The data confirm that protein depletion is associated with loss of host defense mechanisms. Although refeeding by regular diet resulted in restoration of host defense, repletion by parenteral nutrition, in this model, did not improve survival.
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PMID:Malnutrition and immunocompetence: increased mortality following an infectious challenge during hyperalimentation. 678 58

Parenteral nutrition is regarded as a form of nutrition in some countries and as an extension of intravenous fluid therapy in others. The optimum clinical application of parenteral nutrition as a form of therapy requires detailed knowledge of the nutrient solutions themselves, including the commonly used solutions such as dextrose, soybean oil emulsion, synthetic crystalline L-amino acid solutions; older solutions such as xylitol, protein hydrolysates; and newer solutions such as glycerides and special purpose amino acid solutions. Additionally, information has accumulated over the past 10 years, leading to the rational use of vitamins and trace elements in parenteral nutrition. Metabolism of the substrates has been correlated with known pathways of intermediary metabolism in normal, starved and stressed subjects. Several new concepts have arisen: a) Infusion of excessive quantities of dextrose results in lipogenesis and increased carbon dioxide production. Hyperalimentation of this type is being replaced by infusion of lesser quantities of dextrose, supplemented by intravenous infusion of lipid as a calorie source. b) Protein hydrolysates and racemic synthetic crystalline amino acid solutions have been replaced by synthetic crystalline L-amino acid solutions. c) A new fat emulsion based on safflower oil is competing successfully with the traditional soybean oil emulsion. d) Newer substrates are being explored. These include branched chain amino acids, keto analogues of amino acids, synthetic glycerides and maltose. e) Deficiencies of essential fatty acids, trace elements and vitamins have been studied in patients on long term parenteral nutrition and their mechanisms elucidated. Official recommendations for intravenous administration of these nutrients have been made. f) Several techniques have been applied in several circumstances, including protein sparing therapy, cyclic nutrition, home therapy, and parenteral nutrition in liver and renal failure. Parenteral nutrition is now used extensively, not only in major hospitals where the resources of a team approach with physician, nurse, pharmacist and dietitian are available, but also in smaller hospitals where all of these facilities may not be at hand. However, whatever the setting, the principles behind the clinical application of parenteral nutrition should be well understood by those involved, including current approaches to safe preparation and infusion of parenteral nutrition solutions.
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PMID:Parenteral nutrition: current status and concepts. 680 63

Perfusion of 2-deoxy-D-glucose (2-DG) into the IIIrd ventricle (i.c.v.) or intraperitoneal (i.p.) injections produced changes in feeding and other overt behavior, as well as indicative changes in electroencephalograms (EEG). Applications of 2-DG, either i.p. or i.c.v., induced hyperphagia within 4 hr which was then followed by hypophagia for at least 96 hr. EEGs evinced low frequency patterns during the lethargy and ataxia symptoms which were present after i.p. injection. After i.c.v. injections, the low frequency EEG during the lethargy and ataxia were not evident. Present results in connection with prior reports indicate that 2-DG has a long term bimodal effect on feeding which may be mediated through central neurons. Hypophagia after peripheral application of 2-DG appeared to be caused at least as much by concomitant traumatism as by effects on neural control of feeding.
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PMID:Bimodal effect of 2-deoxy-D-glucose on feeding. 689 Nov 21

From the pathophysiological viewpoint, feeding responses to various stimuli were examined in Zucker fatty rats and their lean littermates. Intraventricular administration of norepinephrine (NE, 10 micrograms/rat) stimulated food intake in both rats. Intraventricular administration of 2-deoxy-D-glucose (2DG, 3.8 mg/rat) induced hyperphagia and concomitant hyperglycemia in lean rats. However, in fatty rats, the blood glucose was elevated but food intake was unaltered after 2DG administration. Subcutaneous administration of insulin (2 or 8 U/kg) stimulated food intake of both rats. Streptozotocin (STZ)-induced hypoinsulinemia produced transient reduction of food intake followed by sustained diabetic hyperphagia in lean rats. In fatty rats, the experimental hypoinsulinemia caused transient aphagia but not sustained diabetic hyperphagia. Daily injection of insulin (5 U/rat) restored energy assimilation in both diabetic rats. An increase in food intake due to insulin injection was remarkable only in diabetic fatty rats. From these findings, the regulatory system of food intake in fatty rats appears to be sensitive to changes in the circulating insulin level but insensitive to either glucoprivation or changes in body storage of energy.
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PMID:Feeding responses of Zucker fatty rat to 2-deoxy-D-glucose, norepinephrine, and insulin. 700 24

The effect of two experimental manipulations designed to mobilize lipids from adipose tissue have been investigated in rats with parasagittal knife cuts in the ventromedial hypothalamus (VMH). Those animals which displayed hyperphagia during the initial 5 days VMH knife cuts were then restricted in food intake to reduce body weights to levels comparable to that of the sham-operated controls. Two weeks following the knife-cut lesions, or sham operations, animals in the first experiment were exposed to the cold for 60 min, and those in the second experiment were injected with 2-deoxy-D-glucose (2-DG). The injections of 2-DG increased the level of glycerol in the control animals but not in the animals with VMH knife cuts. Both groups showed a rise in glucose. Plasma insulin and triglycerides were the same in both groups. Exposure to the cold increased the level of glycerol in both groups. The insulin levels were lower in the corresponding groups with knife cuts. These studies show that VMH knife cuts do not produce hyperinsulinemia in pair-gained rats.
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PMID:Obesity-inducing hypothalamic knife cuts: effects on lipolysis and blood insulin levels. 705 66


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