Document Detail


Semistarvation-induced hyperactivity compensates for decreased norepinephrine and dopamine turnover in the mediobasal hypothalamus of the rat.
MedLine Citation:
PMID:  2297396     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Male Wistar rats were housed in running wheel cages and were restricted in their food intake, in order to reduce the initial body weight by 30% within 10 days. Rats increased their daily running up to distances between 7 and 11 km compared to the maximum 2.5 km in controls fed ad libitum. The hypothalamic noradrenaline (NE) turnover, as estimated by the concentration of the major metabolite MHPG, was significantly decreased in semistarved sedentary rats compared to controls. Hyperactivity resulted in marked elevation of NE turnover at all time points examined. Semistarvation-induced decreases of dopamine (DA) turnover as estimated by the concentrations of its major metabolite DOPAC, could also be compensated by hyperactivity. The circadian pattern of NE turnover parallels the pattern of running activity. MHPG levels at times of high activity were even higher than in controls fed ad libitum (p less than 0.01). The availability of the precursor tyrosine, as indicated by the ratio of plasma tyrosine to the large neutral amino acids, was significantly decreased in semistarvation (p less than 0.0001); hyperactivity caused a further decrease (p less than 0.001), indicating that tyrosine availability is not, under these conditions, a limiting factor for noradrenaline turnover. The combined influence of semistarvation and hyperactivity on central catecholamine turnover in the rat is discussed as an animal model for the effects of malnutrition and heavy exercise often observed in anorexia nervosa.
Authors:
A Broocks; J Liu; K M Pirke
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of neural transmission. General section     Volume:  79     ISSN:  -     ISO Abbreviation:  J. Neural Transm. Gen. Sect.     Publication Date:  1990  
Date Detail:
Created Date:  1990-03-09     Completed Date:  1990-03-09     Revised Date:  2014-06-03    
Medline Journal Info:
Nlm Unique ID:  9002201     Medline TA:  J Neural Transm Gen Sect     Country:  AUSTRIA    
Other Details:
Languages:  eng     Pagination:  113-24     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Dopamine / metabolism*
Hyperkinesis / physiopathology*
Hypothalamus, Middle / metabolism*,  physiopathology
Male
Methoxyhydroxyphenylglycol / metabolism
Norepinephrine / metabolism*
Nutrition Disorders / physiopathology*
Rats
Rats, Inbred Strains
Chemical
Reg. No./Substance:
534-82-7/Methoxyhydroxyphenylglycol; VTD58H1Z2X/Dopamine; X4W3ENH1CV/Norepinephrine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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