Hormonal regulation of hepatic glycogenolysis in the carp, Cyprinus carpio

Journal Article · Wed Apr 01 00:00:00 EST 1987 · Am. J. Physiol.; (United States)

OSTI ID:5879269

Janssens, P A; Lowrey, P

Carp (Cyprinus carpio) liver maintained normal glycogen content and enzyme complement for several days in organ culture. Epinephrine-stimulated glycogenolysis, phosphorylase activation, and cyclic AMP (cAMP) accumulation in a concentration-dependent manner with EC/sub 50/s of 100, 100, and 500 nM, respectively. These actions were blocked by the ..beta..-adrenergic antagonist, propranolol, but not by the ..cap alpha..-adrenergic antagonist phentolamine. Glycogenolysis and tissue cAMP were uninfluenced by 10/sup -6/ M arginine vasotocin, arginine vasopressin, lysine vasotocin, lysine vasopressin, mesotocin, or oxytocin, but were slightly increased by 10/sup -5/ M isotocin and slightly decreased by 10/sup -6/ M angiotensin II. (/sup 125/I)-iodocyanopindolol (ICP), a ..beta..-adrenergic ligand, bound to isolated carp liver membranes with a K/sub D/ of 83 pM. Maximum binding of 45 fmol/mg protein was at 600 pM. Propranolol, isoprenaline, epinephrine, phenylephrine, norepinephrine, and phenoxybenzamine displaced ICP with K/sub D/s of 100 nM, 2, 20, 20, 60, and 200 ..mu..M, respectively. The ..cap alpha..-adrenergic antagonists, yohimbine and prazosin, showed no specific binding. These data provide evidence that catecholamines act via ..beta..-adrenergic receptors in carp liver and that ..cap alpha..-adrenergic receptors are not present. Vasoactive peptides play no significant role in regulation of carp liver glycogenolysis.

• Research Organization: Australian National Univ., Canberra
• OSTI ID: 5879269
• Journal Information: Am. J. Physiol.; (United States), Vol. 252:4
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
ADRENAL HORMONES
BIOCHEMISTRY
GLYCOGEN
ENZYMATIC HYDROLYSIS
LABELLED COMPOUNDS
UPTAKE
ADRENALINE
ANGIOTENSIN
BIOCHEMICAL REACTION KINETICS
CATECHOLAMINES
ENZYME ACTIVITY
FISHES
IODINE 125
LIGANDS
LIVER
NORADRENALINE
PEPTIDES
PHOSPHOTRANSFERASES
RECEPTORS
SYMPATHOMIMETICS
VASOPRESSIN
AMINES
ANIMALS
AQUATIC ORGANISMS
AROMATICS
AUTONOMIC NERVOUS SYSTEM AGENTS
BETA DECAY RADIOISOTOPES
BODY
CARBOHYDRATES
CARDIOTONICS
CARDIOVASCULAR AGENTS
CHEMICAL REACTIONS
CHEMISTRY
DAYS LIVING RADIOISOTOPES
DECOMPOSITION
DIGESTIVE SYSTEM
DRUGS
ELECTRON CAPTURE RADIOISOTOPES
ENZYMES
GLANDS
GLOBULINS
HORMONES
HYDROLYSIS
HYDROXY COMPOUNDS
INTERMEDIATE MASS NUCLEI
IODINE ISOTOPES
ISOTOPES
KINETICS
LYSIS
MEMBRANE PROTEINS
NEUROREGULATORS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANS
PEPTIDE HORMONES
PHENOLS
PHOSPHORUS-GROUP TRANSFERASES
PITUITARY HORMONES
POLYPHENOLS
POLYSACCHARIDES
PROTEINS
RADIOISOTOPES
REACTION KINETICS
SACCHARIDES
SOLVOLYSIS
TRANSFERASES
VASOCONSTRICTORS
VERTEBRATES
550201* - Biochemistry- Tracer Techniques