Effect of orchidectomy and estradiol on acetylcholinesterase activity in rat brain areas and adenohypophysis

Summary Orchidectomy plus estradiol administration decreased acetylcholinesterase activity in the rat cerebral cortex and mesencephalon, while in the amygdala it was increased. In the adenohypophysis, orchidectomy increased enzyme activity, but subsequent estradiol treatment decreased it. The hypothalamus did not respond to either manipulation.     

Effect of orchidectomy and estradiol on acetylcholinesterase activity in rat brain areas and adenohypophysis

Orchidectomy plus estradiol administration decreased acetylcholinesterase activity in the rat cerebral cortex and mesencephalon, while in the amygdala it was increased. In the adenohypophysis, orchidectomy increased enzyme activity, but subsequent estradiol treatment decreased it. The hypothalamus did not respond to either manipulation.     

A method for demonstrating acetylcholinesterase and choline acetylase in foetal brain

Résumé Une méthode est décrite qui permet la mesure de l'activité de la choline acétylase dans des régions localisées de sections en congélation de cerveau embryonnaire, activité qui est comparée à celle de l'acétylcholinesterase dans la mÊme région sur des coupes adjacentes. Des résultats obtenus à l'aide de cette méthode sur le cervelet embryonnaire de mouton sont présentés.     

Choline acetyltransferase and acetylcholinesterase in myo-tendinous and neuro-muscular junctions of mouse skeletal muscle

Zusammenfassung Topographischer Nachweis hoher Acetylcholinesterase-Aktivität an der Übergangsstelle Muskel/Sehne und, im Unterschied zur neuromuskulären Verbindung, an dieser Stelle kaum messbare Aktivität der Cholinacetyltransferase, was ohne Beziehung zur cholinergen Erregungsübertragung steht.     

Histochemical remarks on monoamine oxidase and acetylcholinesterase in some regions of amphibian brain

Summary The histochemical localization of monoamine oxidase and acetylcholinesterase has been studied in the cerebellum, optic tectum and telencephalon of three amphibian species. For acetylcholinesterase in particular, different histochemical methods and selective inhibitors have been used in order to investigate the actual nature of enzymatic activity revealed.     

Changes in brain acetylcholinesterase activity of young rats after chronic treatment with tremorine

Résumé La trémorine a été administrée chez les rats quotidiennement pendant 7 jours à des doses de 7.5, 22.5 ou 30 mg/kg. Les témoins ont montré des mouvements convulsifs proportionnels à la dose de trémorine. Quatre jours après l'arrêt du traitement, l'activité acétylcholinestérasique du cortex cérébral était augmentée. Il est proposé que ce change de l'activité acétylcholinestérasique reflète une utilisation accrue de l'acétylcholine corticale.

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Acknowledgement: This investigation was supported by a U.S. Public Health Service Grant No. NS 09199 and a Research Scientist Development Award No. K02 MH-42479 from the National Institute of Mental Health, National Institutes of Health.

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The author gratefully acknowledges the technical assistance ofSandra Roland.     

The acetylcholinesterase reaction and catecholamine fluorescence in the glomus cells of rat carotid body

Summary The presence of both acetylcholinesterase reaction and glyoxylic acid-induced fluorescence of catecholamines in the same glomus cells of rat carotid body was demonstrated using combined histochemical methods. A suggestion is made that the glomus cells have both excitatory and inhibitory effects on the chemosensory nerve via acetylcholine and catecholamines, respectively.Acknowledgments. The present study was supported by grants from the Emil Aaltonen Foundation and the Finnish Cancer Foundation to Timo Waris.     

Aspartate aminotransferase and carbohydrate metabolism of rat brain

Riassunto È stato determinato il rapporto tra forma «piridossalica» e forma «piridossaminica» dell'aspartato aminotransferasi nell'encefalo totale di ratti albini durante l'ipoglicemia da insulina e l'iperglicemia da allossana. Il rapporto tra le due forme catalitiche dell'enzima è stato considerato un indice dell'efficienza del ciclo degli acidi tricarbossilici, ed è stata prospettata la possibilità che l'aspartato aminotransferasi abbia una funzione regolativa nei riguardi del ciclo.     

Morphology of muscle spindles in the rat

Zusammenfassung Die Morphologie und Innervation der Muskelspindeln der Lumbricalmuskulatur im Hinterfuss der Ratte wird beschrieben. Eine typische Muskelspindel enthält zwei «nuclear bag» Fasern und zwei «nuclear chain» Fasern. Jede Spindel enhält 2 motorische Nerven, einer innerviert die «nuclear bag» Fasern, der andere die «nuclear chain» Fasern. 50% der Spindeln haben nur primäre sensorische Innervationen, die übrigen 50% haben eine primäre sensorische Endung und 1 oder 2 sekundäre Endungen.

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Supported by a grant from the Edmonton Civic Employees Association.

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This investigation was conducted under a grant to R.S.S. from the Medical Research Council of Canada.     

Localization of acetylcholinesterase activity in myotendinous and myomyous junctions of the striated skeletal muscles of the rat

Zusammenfassung Mit licht- und elektronenmikroskopischen Methoden wird demonstriert, dass die quergestreiften Muskelfasern sich ohne kollagenes Bindegewebe an andere Muskelfasern anschliessen können. An den gegenüber liegenden Sarcoplasmamembranen konnte Azetylcholinesterase nachgewiesen werden.     

Autoradiographic localization of testosterone-3H in the female rat brain and estradiol-3H in the male rat brain

Zusammenfassung Eine halbe Stunde nach der i.v. Injektion wurde Testosterone-³H von den Nerven- und Glialzellen innerhalb des Gehirns der weiblichen Ratte und Estradiol-³H innerhalb des Gehirns der männlichen Ratte aufgenommen. Zwei Stunden nach der Injektion war die Aufnahme in hohem Masse nur noch in gewissen Teilen des hypothalamisch-limbischen Systems vorhanden.

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This investigation was supported by grants from NASA (No. NsG 496) and the John A. Hartford Foundation to Dr.H.-L. Teuber, and from the U.S. Atomic Energy Commission to Dr.J. Altman, both of the Massachusetts Institute of Technology, and the work was performed while the author was at M.I.T.