By S. Ehrenpreis
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Extra info for Chemical Approaches to Brain Function
Endogenous Dopamine and Norepinephrine The most extensively investigated aspect of the development of the central catecholaminergic neurons has been the changes in the levels of endogenous catecholamines with maturation. There is general agreement that the concentration of norepinephrine in whole rat brain increases in a linear fashion from 15 to 20% of the adult level at birth to the adult concentration by 5-6 weeks after birth (Kulkarni and Shideman, 1966; Agrawal et al, 1966; Coyle and Axelrod, 1971; Breese and Traylor, 1972).
G l a s s , e d s . ) , p . 6 6 5 . J o h n s H o p k i n s Press, B a l t i m o r e , M a r y l a n d . C o h e n , S . ( 1 9 6 0 ) . Proc. Nat. Acad. Sei. U. S. 4 6 , 3 0 2 . C r a i n , S. M . , Benitez, H . , a n d Valter, A. ( 1 9 6 4 ) . Ann. Ν. Y. Acad. Sei. 1 1 8 , 2 0 6 . D e n g l e r , H . J . , M i c h a e l s o n , I. , S p i e g e l , Η . E . , a n d T i t u s , E . ( 1 9 7 2 ) . Int. }. Neuropharmacol. 1, 23. D o l i v o , M . , a n d Roniller, C . ( 1 9 6 9 ) . Progr. Brain Res.
If the sympathetic ganglia were decentralized by cutting the preganglionic nerve on the fourth day of life, there was a rapid de generation of the preganglionic nerve trunk as measured by the loss of cholineacetylase activity. Decentralization prevented the developmental increase in both TH and monoamine oxidase activity and the increase in cell number and ganglion volume (Fig. 14). Thoenen et al (1971) have shown that, in superior cervical ganglia of neonatal rats injected daily from birth to 10 days of life with purified S Y M P A T H E T I C GANGLIA I N ORGAN C U L T U R E 27 100 Η 80 Η Control Decentralized Tyrosine Hydroxylase Control Decentralized MAO F I G .
Chemical Approaches to Brain Function by S. Ehrenpreis