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Acta Neuropathologica

, Volume 14, Issue 1, pp 62–71 | Cite as

Effect of actinomycin D on retrograde nerve cell reaction

Further observations
  • Ansgar Torvik
  • Anna Heding
Original Investigations

Summary

The retrograde nerve cell reaction was studied in the neurons of the reticular formation and in the facial nucleus of mice after intracerebral injections of actinomycin D.

Normally the reticular neurons show a classical type of retrograde reaction with dispersion of the Nissl substance and central chromatolysis. The facial neurons also show a dispersion of the Nissl granules but there is an early increase in the cytoplasmic basophilia instead of chromatolysis. The two types of neurons thus show somewhat different patterns of retrograde reaction.

It was shown previously that actinomycin prevented the appearance of retrograde reaction in the facial nucleus when the drug was injected at the time of operation (Torvik andHeding, 1967). The present study showed that actinomycin blocked the retrograde reaction also in the reticular formation when it was given 2 h before the reticulospinal fibers were cut.

When the drug was given 12 h after section of the reticulospinal fibers, the retrograde reaction developed normally in the reticular formation, although the neurons were morphologically normal at the time of injection. In the facial nucleus the retrograde reaction was blocked when the drug was given 9 h after the operation but not by 15 h.

The findings suggest that the morphological nerve cell changes after axon lesions are preceded by the synthesis of new enzymes in the injured cells, which in some way are necessary for the ensuing dispersion of the Nissl substance.

Key-Words

Nerve Cell Actinomycin D Retrograde Reaction Reticular Formation Facial Nucleus 

Zusammenfassung

Die retrograde Zellreaktion wurde an Neuronen der Formatio reticularis und des Facialiskernes von Mäusen nach intracerebraler Injektion von Actinomycin D untersucht. Gewöhnlich zeigen die retikulären Neurone den klassischen Typ der retrograden Reaktion mit Dispersion der Nissl-Substanz und zentraler Chromatolyse. Die Neurone des Facialiskernes zeigen gleichfalls Dispersion der Nissl-Granula, aber leichte Zunahme der Cytoplasma-Basophilie statt Chromatolyse. Diese Neuronentypen zeigen demnach etwas differente Arten der retrograden Reaktion.

Actinomycin verhindert das Auftreten retrograder Reaktion im Facialiskern, wenn die Substanz z. Z. der Operation injiziert wird (Torvik u.Heding, 1967). Die vorliegende Studie zeigt, daß Actinomycin auch die retrograde Reaktion in der Formatio reticularis bei Verabreichung 2 Std vor Durchtrennung der reticulospinalen Fasern hemmt. Wird die Substanz 12 Std nach Durchtrennung der reticulospinalen Fasern verabreicht, so entwickelt sich die retrograde Degeneration in üblicher Weise in der Formatio reticularis, obwohl die Neurone zur Zeit der Injektion normal waren. Im Facialiskern wird die retrograde Reaktion durch Gabe der Substanz 9 Std nach der Operation, nicht aber nach 15 Std, blockiert.

Die Befunde lassen vermuten, daß den morphologischen Nervenzellveränderungen nach Axonläsion die Synthese neuer Enzyme in den geschädigten Zellen vorausght, die irgendwie für die folgende Dispersion der Nissl-Substanz erforderlich sind.

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Copyright information

© Springer-Verlag 1969

Authors and Affiliations

  • Ansgar Torvik
    • 1
  • Anna Heding
    • 1
  1. 1.Department of PathologyUllevål HospitalOsloNorway

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