Download Cyclic Nucleotides in the Nervous System by John Daly PDF

By John Daly

The elucidation of the mobile and molecular bases underlying the inte­ grated functionality of the important anxious procedure, either in affliction and in healthiness, needs to finally come from the mixed efforts of scientists from many disciplines, together with biology, chemistry, histology, pathology, body structure, pharmacology, and psychology. communique among scientists from those a variety of disciplines-vital to the development of our realizing of the functionality of the anxious system-has turn into an increasing number of tough lately. either expanding specialization and the impressive raises in guides pertinent to mind examine in a large spectrum of journals, in symposium volumes, in monographs, in abstracts, and in studies contrib­ ute to the issues of cross-communication or even of verbal exchange inside of a systematic self-discipline. examine at the importance of cyclic nucleo­ tides to the functionality of frightened platforms is especially illustrative of the conversation challenge. because the preliminary guides via Sutherland, Rall, and Butcher within the overdue fifties and early sixties on excessive degrees of adenylate cyclase, phosphodiesterases, and cyclic AMP in mind, the resultant litera­ ture of this box has elevated exponentially. today, from 5 to 10 guides correct to cyclic nucleotides and the fearful method seem each one week. certainly, those are minimum numbers established ordinarily on exam of literature titles and key index phrases. Many articles thinking about a few element of relevant functionality include, buried inside their textual content, experiments with or regarding cyclic nucleotides.

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Chou et al. (1971a) reported the activation of adenylate cyclases in mouse cerebral cortical homogenates by morphine. , 1975). , 1975). Enkephalins have been cited 24 Chapter 2 as antagonizing the activation of brain adenylate cyclase by prostaglandins (Goldstein, 1976). Depolarizing Agents Ouabain was reported to elicit a small increase in cyclase activity of cell-free preparations from rat cerebral cortex, but only with suboptimal concentrations of manganese and with calcium ions absent (Katz and Tenenhouse, 1973b).

Large numbers of vesicular entities along with classical synaptosomes-some with attached postsynaptic vesicular entities-were present in these preparations (Hom and Phillipson, 1976). In a study on synaptosomes prepared in the usual fashion in isotonic sucrose, accumulation of cyclic AMP from what appeared to be intrasynaptosomal ATP was measured (Harris, 1976). Synaptosomes were prepared from adenine-labeled rat cortical, hindbrain, and striatal slices. Isoproterenol, norepinephrine, and to a lesser degree dopamine elicited accumulations of radioactive cyclic AMP.

An inhibitory component to adenosine action was apparent at high concentrations of this nucleoside. Theophylline (K i , 35 ILM) competitively inhibited the response to 2-chloroadenosine, while having no effect on prostaglandin-sensitive cyclase activity. 2' - and 5' -deoxyadenosine inhibited basal, 2-chloroadenosine, and prostaglandinsensitive cyclases. Prostaglandins El and E2 caused a very large activation of cyclases from neuroblastoma cells, while prostaglandin F2

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