Inhibition of Release of Dopamine-β-Hydroxylase and Norepinephrine from Sympathetic Nerves by Colchicine, Vinblastine, or Cytochalasin-B | Zendy

Nguyen B. Thoa | Zendy; G. Frederick Wooten | Zendy; Julius Axelrod | Zendy; Irwin J. Kopin | Zendy

Open Access

Inhibition of Release of Dopamine-β-Hydroxylase and Norepinephrine from Sympathetic Nerves by Colchicine, Vinblastine, or Cytochalasin-B

Author(s) -

Nguyen B. Thoa,

G. Frederick Wooten,

Julius Axelrod,

Irwin J. Kopin

Publication year - 1972

Publication title -

proceedings of the national academy of sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.011

H-Index - 771

eISSN - 1091-6490

pISSN - 0027-8424

DOI - 10.1073/pnas.69.2.520

Subject(s) - phenoxybenzamine , vas deferens , norepinephrine , colchicine , dopamine , cytochalasin b , medicine , endocrinology , chemistry , biology , biochemistry , in vitro , propranolol

Stimulation of the hypogastric nerve to the guinea pig vas deferens in the presence of phenoxybenzamine produced an enhanced release of both dopamine-beta-hydroxylase (EC 1.14.2.1) and norepinephrine. Addition of colchicine, vinblastine, or cytochalasin-B to the incubation medium caused an almost complete inhibition of release of both the amine and the enzyme. Colchicine and cytochalasin-B produced a blocking effect but did not, however, modify the ratio of dopamine-beta-hydroxylase to norepinephrine recovered in the bath fluid. The findings indicate that norepinephrine and dopamine-beta-hydroxylase are released from sympathetic nerve terminals by exocytosis and that this process is dependent upon the integrity of both microtubules and microfilaments.

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