Dual 24-hour feeding response to 2DG in rats: Daytime increase and nighttime decrease
| Autor: | David A. Hornback, Robert L. Fleming, Steven P. Boha, Kenneth A. Franken, Carl I. Thompson |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
Blood Glucose
Daytime medicine.medical_specialty Food intake Evening medicine.medical_treatment Experimental and Cognitive Psychology Deoxyglucose Malaise Behavioral Neuroscience Internal medicine Deoxy Sugars medicine Animals Circadian rhythm Saline Morning Dose-Response Relationship Drug business.industry Rats Inbred Strains Feeding Behavior Circadian Rhythm Rats Endocrinology Darkness Female medicine.symptom business |
| Zdroj: | Physiology & Behavior. 45:155-161 |
| ISSN: | 0031-9384 |
| DOI: | 10.1016/0031-9384(89)90179-0 |
| Popis: | Thirty-six rats were injected IP with 2DG (0, 250, or 500 mg/kg) at 7-day intervals, once at light onset (7 a.m.) and once at dark onset (7 p.m.), and postinjection food intake was monitored for 24 hours. Five hundred mg/kg 2DG caused food intake to rise above control levels during the first 6 hours of daylight, regardless of whether the injection had occurred that morning or the previous evening, whereas intake during the first 6 hours of darkness was consistently below control levels. In a second study, 24 rats were injected first at 7 a.m. (500 mg/kg 2DG or saline), and 7 days later at 7 p.m. (opposite drug), and food was withheld 12 hours until the light:dark period had changed. For 12 hours after food was returned, 2DG again decreased nighttime food intake (Injection 1) and increased daytime intake (Injection 2). 2DG's dual long-term effects cannot be accounted for either by malaise or by an initial action that later is compensated by its opposite. Rather, 2DG (500 mg/kg) appears to exert two independent, opposite alimentary effects which persist 18-24 hours and which change direction with phase changes in the light:dark cycle. |
| Databáze: | OpenAIRE |
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