Differential sorting and packaging of capa-gene related products in an insect.
A unique costorage of neuropeptides was recently found in the abdominal perisympathetic organs (PSOs) of the American cockroach, Periplaneta americana. Having specific antisera directed against all peptides belonging to this neurosecretory system, we examined the sorting of PSO-peptides in the soma of the median neurosecretory cells of abdominal ganglia by using immunoelectron microscopic double stainings. The data indicate that all six abundant neuropeptides of this neurohormonal system, which includes three capa-gene related products, are primarily incorporated into separate vesicles. These vesicles fuse with each other in the cytoplasm and become translucent on their way to the axon hillock. By means of light microscopy and MALDI-TOF mass spectrometry, an identical population of neuropeptides was found in interneurons of the brain. As revealed by subsequent immunoelectron microscopic analysis, the peptides of these cells are separately packed into dense core vesicles but do not fuse with each other. Thus, hitherto unknown cell-type-specific sorting mechanisms occur in neurosecretory cells and interneurons, respectively.
Pollák
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Research Group of Comparative Anatomy, Department of General Zoology and Neurobiology, University of Pécs, H-7624 Pécs, Hungary.
Eckert
Manfred
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Molnár
László
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Predel
Reinhard
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D000005:Abdomen / Q000294:innervation; D000818:Animals; D005260:Female; D005455:Fluorescent Antibody Technique; D017952:Ganglia, Invertebrate / Q000378:metabolism / Q000648:ultrastructure; D005726:Ganglia, Parasympathetic / Q000378:metabolism / Q000648:ultrastructure; D019476:Insect Proteins / Q000378:metabolism*; D007395:Interneurons / Q000378:metabolism* / Q000648:ultrastructure; D008297:Male; D009479:Neuropeptides / Q000378:metabolism*; D009490:Neurosecretory Systems / Q000378:metabolism* / Q000648:ultrastructure; D010526:Periplaneta / Q000378:metabolism* / Q000648:ultrastructure; D021381:Protein Transport / Q000502:physiology; D022142:Secretory Vesicles / Q000378:metabolism; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
D019476:Insect Proteins; D009479:Neuropeptides; C093061:periviscerokinin; C079229:pyrokinin