Deprenyl treatment restores serum insulin-like growth factor-I (IGF-I) levels in aged rats to young rat level

De la Cruz CP, Revilla E, Rodriguez-Gomez JA,
Vizuete ML, Cano J, Machado A

Departamento de Bioquimica,
Bromatologia y Toxicologia,
Facultad de Farmacia,
Universidad de Sevilla, Spain.
Eur J Pharmacol 1997 May 30; 327(2-3):215-20


We studied the effects of treatment with (-)-deprenyl, a monoamine oxidase B inhibitor, on plasma levels of insulin-like growth factor-I (IGF-I) (as indicator of growth hormone (GH) secretion), levels of monoamines and their metabolites, and the activity and content of tyrosine hydroxylase - the rate-limiting enzyme in the biosynthesis of catecholamines - in the hypothalamus and hypophysis of old male rats.  Male Wistar rats (22 months old) were treated with 2 mg deprenyl/kg body weight s.c. three times a week for 2 months.  At the end of the treatment period, blood was collected for measurement of plasma IGF-I levels by radioimmunoassay (RIA).  The concentrations of dopamine, serotonin (5-HT) and their main metabolites were determined by high performance liquid chromatography (HPLC) with electrochemical detection, and the tyrosine hydroxylase content in hypothalamus and hypophysis was determined by enzyme-linked immunoabsorbent assay (ELISA). (-)-Deprenyl treatment produced a pronounced increase in dopamine and 5-HT in both the hypothalamus and hypophysis (P < 0.01).  The main dopaminergic metabolite, 3,4-dihydroxyphenylacetic acid (DOPAC), decreased in hypothalamus but not in hypophysis, and treatment had no effect on the concentration of 5-hydroxyindole-3-acetic acid (5-HIAA).  The tyrosine hydroxylase activity and tyrosine hydroxylase content increased in hypothalamus and hypophysis (P < 0.05). In the hypophysis the increase in tyrosine hydroxylase activity was consistent with the increase in tyrosine hydroxylase amount.  Moreover, (-)-deprenyl treatment restored the IGF-I plasma levels in old rats to a concentration similar to those found in young animals.  Postulated anti-aging effects of (-)-deprenyl could hence be due to restoration of hypothalamic hormones such as GH.
  • Deprenyl  in the treatment of Alzheimer's disease
  • Deprenyl  MAO-B inhibitors in the treatment of Alzheimer's disease
  • Deprenyl  for Alzheimer's disease
  • Deprenyl  stimulates biosynthesis of cytokines interleukin-1 & 6
  • Deprenyl  and age-related decline of the striatal dopaminergic system
  • Deprenyl  improves memory in amnesic Alzheimer's patients
  • Deprenyl  treatment of behavioral symptoms of Alzheimer's disease
  • Deprenyl   increases life span in Parkinson's patients
  • Deprenyl   possible mechanisms of action in Parkinson's disease
  • Deprenyl   effect on arm movement in early Parkinson's
  • Deprenyl   effect on cognitive functions in early Parkinson's 
  • Deprenyl   possible mechanisms of action in Parkinson's
  • Deprenyl   depression in Parkinson's disease
  • Deprenyl   improves visuo-motor control in early Parkinsonism
  • Deprenyl   management of early Parkinson's disease
  • Deprenyl   delays the onset of disability in Parkinsonian patients
  • Deprenyl   and tocopherol antioxidative therapy of Parkinsonism
  • Deprenyl   treatment and death of nigral neurons in Parkinson's disease.
  • Deprenyl   rationale for deprenyl medication in Parkinson's disease
  • Deprenyl   and levodopa in Parkinson's disease
  • Deprenyl   is an MAO-B inhibitor
  • Deprenyl   facilitates neuronal growth without inhibiting monoamine oxidase
  • Deprenyl   pharmacology
  • Deprenyl   biochemical actions
  • Deprenyl   effect of MAO-B inhibitors on MPP+ toxicity
  • Deprenyl   the history of its development
  • Deprenyl   protects neurons against neurotoxins
  • Deprenyl   in neurodegenerative disorders
  • Deprenyl   enhances the release of dopamine
  • Deprenyl   plus L-phenylalanine in the treatment of depression
  • Deprenyl   in the treatment-resistant of older depressive patients
  • Deprenyl   effects in atypical depressives
  • Deprenyl   up-regulates superoxide dismutase and catalase
  • Deprenyl   immunostimulant
  • Deprenyl   pharmacology
  • Deprenyl   effect on rat longevity and sexual acitivity
  • Deprenyl   effects of experimental cocaine administration
  • Deprenyl   effects on longevity in animals
  • Deprenyl   effects on subjective ratings of cocaine-induced euphoria
  • Deprenyl   increases the life span in Fischer rats
  • Deprenyl   effects on short term memory in young and aged dogs
  • Deprenyl   the facilitation of dopaminergic activity in the aged brain
  • Deprenyl   fluoxetine (Prozac) and deprenyl
  • Deprenyl   improves cardiac sympathetic terminal function in heart failure
  • Deprenyl   effect on dopamine concentration in the striatum of a primate
  • Deprenyl   a review of the pharmacology
  • Deprenyl   restores IGF-1 levels to young levels
  • Deprenyl   prolongs life in elderly dogs
  • Deprenyl   past, present, and future
  • Deprenyl   relevance to humans
  • Deprenyl   responses of forebrain neurons to deprenyl
  • Deprenyl   protects neurons from glutamate toxicity
  • Deprenyl   nitric oxide production and dilation of cerebral blood vessels
  • Deprenyl   modulates the decline of the striatal dopaminergic system
  • Deprenyl   inhibits tumor growth in rats with mammary tumors
  • Deprenyl   a catecholaminergic activity enhancer in the brain
  • Deprenyl   releases coupling in the catecholaminergic neurons
  • Deprenyl   clinical potential in neurologic and psychiatric disorders
  • Deprenyl   protects human dopaminergic neuroblastoma cells
  • Deprenyl   nitric oxide production and dilation of cerebral blood vessels
  • Deprenyl   assessing the effects of deprenyl on longevity of animals
  • Deprenyl   effects on cocaine-induced euphoria
  • Deprenyl   effects on response to experimental cocaine administration  
  • Deprenyl   Are metabolites of deprenyl useful or harmful?
  • Deprenyl   is devoid of amphetamine-like effects
  • Deprenyl   treated rats lived beyond the known maximum lifespan
  • Deprenyl   stimulates biosynthesis of cytokines interleukin-1 & 6
  • Deprenyl   pharmacological basis of the beneficial effects
  • Deprenyl   modulates the decline of the dopamineric system