Rat brain preproenkephalin mRNA. cDNA cloning, primary structure, and distribution in the central nervous system.

In the pond snail Lymnaea stagnalis infected with the schistosome parasite Trichobilharzia ocellata, a peptide called schistosomin is released from the central nervous system, which counteracts the bioactivity of a number of gonadotropic hormones. This leads to inhibition of the reproductive activities of the infected snail. In order to determine the structure of schistosomin, the neuropeptide was purified from the central nervous system using gel-permeation chromatography and reverse-phase h.p.l.c. The complete primary structure of the peptide was determined by N-terminal sequencing and peptide mapping. Schistosomin is a single-chain molecule of 79 amino acids with a molecular mass of 8738 Da. The peptide contains eight cysteine residues which may give rise to four intramolecular disulphide bridges that fold the peptide into a stable globular structure. A database search did not reveal any known peptides that show significant sequence similarity to schistosomin. By means of immunocytochemistry, the peptide was shown to be localized in the growth-controlling neurosecretory light green cells, which are located in the cerebral ganglia of the central nervous system of Lymnaea. In addition to schistosomin, these neurons are known to produce various insulin-related peptides.

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Intracellular distribution of pentobarbital sodium in rat brain

10.32469/10355/72681 ◽

1958 ◽

Author(s):

◽

Carol Jean Oen

Keyword(s):

Central Nervous System ◽

Nervous System ◽

Rat Brain ◽

Major Effect ◽

Cellular Component ◽

Intracellular Distribution ◽

Brain Cells ◽

Pentobarbital Sodium ◽

The Central Nervous System ◽

The Way

"The major effect of the barbiturates is depression of the central nervous system, but the way in which these drugs exert their effect is not yet well understood...As the biochemical functions of the cell and its various parts become better understood, it is of interest to relate the actions of t a drug to some particular function (Reiner and Gellhorn, 1956). If it were found that barbiturate were localized by a particular cellular component, this might mean that its effect was rendered through some function of that particular component. Consequently, this study was undertaken to determine the intracellular distribution of a particular barbiturate, pentobarbital sodium, within rat brain cells."--Introduction

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Imidazo[1,2-b]pyridazines. XIII. Syntheses and Central Nervous System Activities of Some 2-Benzyl(phenethyl, biphenyl-4'-yl, 6'-methylnaphthalen-2'-yl, t-Butyl and cyclohexyl)-3-methoxy(acylaminomethyl and dimethylaminomethyl)-6-(variously substituted)imidazo[1,2-b]pyridazines

Australian Journal of Chemistry ◽

10.1071/ch9921281 ◽

1992 ◽

Vol 45 (8) ◽

pp. 1281 ◽

Cited By ~ 4

Author(s):

GB Barlin ◽

LP Davies ◽

SJ Ireland ◽

JK Zhang

Keyword(s):

Central Nervous System ◽

Nervous System ◽

Rat Brain ◽

Brain Membrane ◽

The Central Nervous System

6-(Variously substituted)-3-methoxy(unsubstituted, dimethylaminomethyl, acetamidomethyl and benzamidomethy1)-2-benzyl(phenethyl, biphenyl-4'-yl, 6'-methylnaphthalen-2'-yl, t-butyl and cyclohexyl)imidazo[1,2-b] pyridazines have been prepared and examined for activity in the central nervous system. Of these, 2-benzyl-3-methoxy-6-(3'-methoxybenzylamino) imidazo[1,2-b]pyridazine (IC50 88nM) bound most strongly to rat brain membrane. In general, the order of activity for groups at the 2-position was Ph > PhCH2 > PhCH2CH2 > C6H4Ph-p, 6'-methylnaphthalen-2'-yl, c-C6H11 or But.

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