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Immunohistochemical investigations of neuropeptides in the brain, corpora cardiaca, and corpora allata of an adult lepidopteran insect, Manduca sexta (L)

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Summary

In the brain of adult specimens of the tobacco hornworm moth, Manduca sexta (L), cells immunoreactive for several kinds of neuropeptides were localized by means of the PAP procedure, by use of antisera raised against mammalian hormones or hormonal peptides. In contrast, no such neurosecretory cells were found in the corpora cardiaca and corpora allata (CC/CA); in the CC/CA, however, immunoreactive nerve fibres were observed, reaching these organs from the brain.

The neurosecretory cells found in the brain were immunoreactive with at least one of the following mammalian antisera, namely those raised against the insulin B-chain, somatostatin, glucagon C-terminal, glucagon N-terminal, pancreatic polypeptide (PP), secretin, vasoactive intestinal polypeptide (VIP), glucose-dependent insulinotropic peptide (GIP), gastrin C-terminus, enkephalin, α-and β-endorphin, Substance P, and calcitonin. No cells were immunoreactive with antisera specific for detecting neurons containing the insulin A-chain, nerve growth factor, epidermal growth factor, insulin connecting peptide (C-peptide), polypeptide YY (PYY), gastrin mid-portion (sequence 6–13), cholecystokinin (CCK) mid-portion (sequences 9–20 and 9–25), neurotensin C-terminus, bombesin, motilin, ACTH, or serotonin.

All the neuropeptide-immunoreactive cells observed emitted nerve fibers passing through the brain to the CC and in some cases also to the CA. In CC these immunoreactive nerve fibers tended to accumulate near the aorta. It was speculated that neuropeptides are released into the circulating haemolymph and act as neurohormones.

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Authors and Affiliations

  1. Department of Pathology, University of Uppsala, Sweden

    M. El-Salhy

  2. Department of Pathology, University of Lund, Malmö General Hospital, Malmö, Sweden

    S. Falkmer MD, PhD (Professor and Chairman)

  3. U.S. Department of Agriculture, U.S. Grain Marketing Research Laboratory, Agricultural Research Service, Manhattan, Kansas, USA

    K. J. Kramer & R. D. Speirs

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  1. M. El-Salhy
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  2. S. Falkmer MD, PhD
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  3. K. J. Kramer
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  4. R. D. Speirs
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El-Salhy, M., Falkmer, S., Kramer, K.J. et al. Immunohistochemical investigations of neuropeptides in the brain, corpora cardiaca, and corpora allata of an adult lepidopteran insect, Manduca sexta (L). Cell Tissue Res. 232, 295–317 (1983). https://doi.org/10.1007/BF00213788

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