Effects of starvation, refeeding, and insulin on energy-linked metabolic processes in catfish (Rhamdia hilarii) adapted to a carbohydrate-rich diet

Journal Article · Thu Sep 01 04:00:00 EDT 1988 · Gen. Comp. Endocrinol.; (United States)

DOI:https://doi.org/10.1016/0016-6480(88)90272-9· OSTI ID:6517377

Machado, C R; Garofalo, M A; Roselino, J E; Kettelhut, I C; Migliorini, R H

The effects of starvation and of a short period of refeeding on energy-linked metabolic processes, as well as the effects of insulin administration, were investigated in an omnivorous fish (catfish, Rhamdia hilarii) previously adapted to a carbohydrate-rich diet. Following food deprivation blood sugar levels declined progressively to about 50% of fed values after 30 days. During the same period plasma free fatty acid (FFA) concentration increased twofold. Starvation resulted in reduced concentrations of lipid and glycogen in the liver and of glycogen, lipid, and protein in white muscle. However, taking into account the initial and final concentrations of tissue constituents, the liver weight, and the large fractions of body weight represented by muscle, it could be estimated that most of the energy utilized during starvation derived from the catabolism of muscle lipid and protein. Refeeding starved fishes for 48 hr induced several-fold increases in the rates of in vivo and in vitro incorporation of (14C)glucose into liver and muscle lipid and of (14C)glycine into liver and muscle protein. Incorporation of (14C)glucose into liver glycogen was also increased. However; refeeding did not affect the incorporation of labeled glucose into muscle glycogen, neither in vivo nor in vitro. Administration of pharmacological doses of insulin to normally fed catfishes resulted in marked increases in the in vivo incorporation of 14C from glucose into lipid and protein in both liver and muscle. In contrast, labeled glucose incorporation into muscle glycogen was not affected by insulin and label incorporation into liver glycogen was actually lower than that in noninjected controls.

• Research Organization: UNESP School of Veterinary Medicine (Brazil)
• OSTI ID: 6517377
• Journal Information: Gen. Comp. Endocrinol.; (United States), Journal Name: Gen. Comp. Endocrinol.; (United States) Vol. 71:3; ISSN GCENA
• Country of Publication: United States
• Language: English

Related Subjects

550501* -- Metabolism-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ALDEHYDES
ANIMALS
AQUATIC ORGANISMS
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL EFFECTS
BODY
CARBOHYDRATES
CARBON 14 COMPOUNDS
CARBOXYLIC ACIDS
DIET
DIGESTIVE SYSTEM
FASTING
FISHES
FOOD
GLANDS
GLUCOSE
GLYCOGEN
HEXOSES
HORMONES
INSULIN
ISOTOPE APPLICATIONS
KINETICS
LABELLED COMPOUNDS
LIPIDS
LIVER
METABOLISM
MONOSACCHARIDES
MUSCLES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANS
PEPTIDE HORMONES
POLYSACCHARIDES
REACTION KINETICS
SACCHARIDES
TRACER TECHNIQUES
VERTEBRATES