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Peptidergic neurons in the Colorado potato beetle, Leptinotarsa decemlineata (Say), identified immunocytochemically by monoclonal antibodies against homogenates of neuroendocrine tissue

Summary

Monoclonal antibodies were developed against peptidergic neurons in the nervous and endocrine tissues of the Colorado potato beetle by the immunization of mice with unpurified homogenates of these tissues. Methods were optimized to enhance chances for successful antibody production and selection, such as the pretreatment of the beetles, preparation of the immunogen, and screening hybridomas. Although only sub-microgram quantities of peptide antigen were used, many hybridomas generated antibodies recognizing peptidergic neurons in immunocytochemical procedures. A panel of 13 monoclonal antibodies anti-Colorado potato beetle (MACs) were harvested. All MACs stained different populations of peptidergic neurons, some of which had not been revealed by previously applied identification methods. Apart from the intrinsic glandular cells in the corpora cardiaca, immunoreactive neurosecretory neurons were revealed in medial and lateral groups in the protocerebrum and in the suboesophageal ganglion. These have axons terminating in the corpora cardiaca, and the neurosecretory granules can be revealed with the immunogold method. It is suggested that the immunoreactive substances represent neuropeptides or precursors of different kinds. Interneurons in other locations in the central and visceral nervous system have immunoreactive axonal projections that do not leave the ganglia. The set of MACs obtained is useful for neuroanatomical studies, for characterizing the secretory products, and for a further delineation of peptidergic communication channels in the insect body.

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Correspondence to Dr. H. Schooneveld.

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Schooneveld, H., Smid, H.M., Boonekamp, P.M. et al. Peptidergic neurons in the Colorado potato beetle, Leptinotarsa decemlineata (Say), identified immunocytochemically by monoclonal antibodies against homogenates of neuroendocrine tissue. Cell Tissue Res. 257, 29–39 (1989). https://doi.org/10.1007/BF00221631

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Key words

  • Neuropeptides
  • Monoclonal antibodies
  • Immunocytochemistry
  • Endocrine system
  • Nervous system
  • Leptinotarsa decemlineata (Say)