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On the ultrastructural localization of catecholamines in the beta lobes (corpora pedunculata) of Periplaneta americana

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Summary

In the brain of the cockroach Periplaneta americana, the beta lobes of the corpora pedunculata respond with an intense positive reaction to a specific fluorescence histochemical method for catecholamines. The fluorescence reaction disappears completely after prolonged treatment of the cockroaches with reserpine. An ultrastructural examination of the beta lobes in formaldehyde-glutaraldehyde-osmium fixed preparations reveals the presence of two types of fibres: 1) Fibres and nerve endings containing small clear vesicles and sligthly larger vesicles with a semi-dense content. The appearance and size distribution of these vesicles ist not affected by treatment with reserpine. 2) Fibres containing larger and denser vesicles, but practically no clear vesicles. The size distribution of these dense vesicles is only slightly affected by treatment of the cockroaches with reserpine.

If brain slices are incubated in a medium containing noradrenaline or α-methyl-noradrenaline and fixed in permanganate, small vesicles with electron-dense central cores show up, similar to those which have been described in vertebrate adrenergic nerve fibres (“small granular vesicles”). They are confined to one of the two types of fibres (a and b) visible in these preparations, namely to type b, whose correspondence with type 2 fibres of formaldehyde-glutaraldehyde-osmium fixed preparations is discussed.

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Authors and Affiliations

  1. Physics and Parasitology Laboratories, Istituto Superiore di Sanità, Rome, Italy

    G. Mancini & N. Frontali

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  1. G. Mancini
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  2. N. Frontali
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The authors wish to thank Mr. E. Chessa and Mr. F. Piccirilli for technical assistance in photography.

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Mancini, G., Frontali, N. On the ultrastructural localization of catecholamines in the beta lobes (corpora pedunculata) of Periplaneta americana . Z. Zellforsch. 103, 341–350 (1970). https://doi.org/10.1007/BF00335278

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  • DOI: https://doi.org/10.1007/BF00335278

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