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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Insect Physiology 25 (1979), S. 449-453 
    ISSN: 0022-1910
    Keywords: Colorado potato beetle ; Leptinotarsa decemlineata (Say) ; corpus allatum ; endocrine control ; hormone titres ; juvenile hormone
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 51 (1989), S. 283-296 
    ISSN: 1570-7458
    Keywords: Monoclonal antibodies ; hybridoma techniques ; immunocytochemistry ; neuroanatomy ; central nervous system ; endocrine system ; Colorado potato beetle ; Leptinotarsa decemlineata (Say)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'utilisation de techniques immunocytochimiques lors d'études neuro-anatomiques est encore dans l'enfance par suite de l'absence de données sur la chimie de structures spécifiques et, par conséquent, de l'absence d'anticorps spécifiques d'antigènes et de tissus. Nous apportons la preuve que de nombreuses substances réelles d'homogénats bruts de cerveaux sont de bons antigènes et que les souris peuvent être induites à produire des anticorps contre ceux-ci. Nous avons produit et testé de nombreux anticorps monoclonaux qui reconnaissent ces antigènes sur des lames de microscope, en utilisant des techniques immunocytochimiques courantes ou plus élaborées. Les immunogènes ont été préparés de différentes façons pour examiner si le taux de mélange de tissus du cerveau et/ou des ganglions associés et de glandes endocrines, et si les procédés ultérieurs de purification et d'immunisation, influeraient sur la spécificité des anticorps. L'intégralité de l'ensemble cerveau-glandes endocrines a été le plus immunogénique quand l'homogénat a subi le minimum de manipulations. Une grande diversité d'anticorps a été obtenue après des injections répétées chez la souris. Ces anticorps reconnaissent les épitopes dans toutes les catégories de tissus considérés, c'est-à-dire, les tissus spécifiquement nerveux, neuro-endocrines, et non nerveux. La purification progressive et le cross-linking des constituants de l'homogénat réduisent la variabilité des anticorps. Tout en l'espérant, on ne s'attendait pas à ce que les substances jusqu'alors dans des centres peptidergiques indéfinis fussent parmi les structures les plus souvent identifiées. Les chances de produire de tels anticorps spécifiques de peptides ont augmenté quand les tissus endocrines ont servi d'immunogènes. Nous avons résumé les types de tissus et de cellules mis en évidence par cette sélection d'anticorps monoclonaux. Nous soulignons que l'expérimentateur peut difficilement influencer les préférences du système immunologique de la souris, mais les anticorps produits jusqu'ici sont valables pour les études neuroanatomiques et pour la récolte d'antigènes intéressants à partir de procédés biochimiques de séparation. Il reste à explorer la spécificité sensu stricto des anticorps.
    Notes: Abstract Immunization of mice with crude or purified homogenates of brain and endocrine organs of the Colorado potato beetle, Leptinotarsa decemlineata (Say), generated antibodies against specific antigens in the insect tissue. Hybridomas were prepared and screened immunocytochemically for the production of monoclonal antibodies (MAB) that recognized specific cells and that were useful for neuroanatomical studies. A relatively high proportion of MABs recognized one or more cells or tissues in neuronal, neuroendocrine or nonneural compartments of the brain or in fatbody or haemocytes, using standard immunocytochemical procedures. We could make a clear differentiation in subsets of neurons (both ‘normal’ and peptidergic) and neuron-specific neuroglial cells. A full account of the obtained responses is given. The preparation of the immunogen and the immunization protocol affects the selection of MABs produced. It is argued that not all possibilities have been exploited and that continued experiments would probably increase the number of selective MABs.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0878
    Keywords: Adipokinetic hormones I and II ; Corpus cardiacum ; Immuno-electron microscopy ; Locusta migratoria ; Schistocerca gregaria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The immunocytochemical reactivity of the glandular cells of the corpus cardiacum (CCG-cells) of Locusta migratoria and Schistocerca gregaria was investigated at the electron-microscopic level, using the protein A-gold method, with three antisera against fragments of the adipokinetic hormones AKH I and AKH II. This combination of antisera permitted discrimination between anti-AKH I and anti-AKH II immunoreactivity. Fixation in a mixture of 2% glutaraldehyde and 2% formaldehyde, in combination with low-temperature embedding in Lowicryl K4M, produced the highest and most consistent selective immunogold labelling of the secretory and ergastoplasmic granules. All secretory granules in all CCG-cells investigated possessed a distinct anti-AKH I-immunopositive reaction, whereas most secretory granules showed a weaker anti-AKH II immunoreaction. Ergastoplasmic granules reacted similar to the secretory granules. The average immunolabelling of the secretory granules was higher in the processes than in the cell bodies of the CCG-cells. The results in Schistocerca gregaria were essentially similar to those in Locusta migratoria. It is concluded that (i) the individual CCG-cells synthesize AKH I as well as AKH II; (ii) these hormones coexist in the same ergastoplasmic and secretory granules; and (iii) these granules contain a higher content of AKH I than AKH II.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0878
    Keywords: Neuropeptides ; Monoclonal antibodies ; Immunocytochemistry ; Endocrine system ; Nervous system ; Leptinotarsa decemlineata (Say)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
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