Localization of pigment-dispersing hormone (PDH) immunoreactivity in the central nervous system of Carcinus maenas and Orconectes limosus (Crustacea), with reference to FMRFamide immunoreactivity in O. limosus

@article{Mangerich2004LocalizationOP,
  title={Localization of pigment-dispersing hormone (PDH) immunoreactivity in the central nervous system of Carcinus maenas and Orconectes limosus (Crustacea), with reference to FMRFamide immunoreactivity in O. limosus},
  author={Sigrid Mangerich and Rainer Keller},
  journal={Cell and Tissue Research},
  year={2004},
  volume={253},
  pages={199-208}
}
SummaryBy use of antisera raised against synthetic pigment-dispersing hormone (PDH) of Uca pugilator and FMRFamide, the distribution of immunoreactive structures in the central nervous system (CNS) of Carcinus maenas and Orconectes limosus was studied by light microscopy. In both species, a total of 10–12 PDH-positive perikarya occur amongst the anterior medial, dorsal lateral and angular somata of the cerebral ganglion (CG). In C. maenas, one PDH-perikaryon was found in each commissural… 
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The distribution and morphology of serotonin-immunoreactive neurons in the cockroach lamina was found to be very similar to the PDH-IR ones, which may be candidates for regulating large numbers of units in the visual system.
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TLDR
This study characterized the distributions and potential colocalization of choline acetyltransferase (ChAT), serotonin (5-HT) and neuropeptide H-Phe-Met-Arg-P he-NH2 (FMRFamide) in the central nervous system (CNS) of the Asian shore crab, Hemigrapsus sanguineus using immunohistochemical analyses in combination with laser scanning confocal microscopy.
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It is found that the anatomical structure of the brain is similar to other crabs, but the ventral nerve cord (VNC) is unlike other caridian and dendrobrachiate decapods, as the subesophageal, thoracic and abdominal ganglia are fused, due to the reduction of abdominal segments and the tail.
Immunocytochemical Localization of Enzymes Involved in Dopamine, Serotonin, and Acetylcholine Synthesis in the Optic Neuropils and Neuroendocrine System of Eyestalks of Paralithodes camtschaticus
TLDR
Findings establish the presence of several neurotransmitters in the XO-SG complex of P. camtschaticus and localization of 5-HT- and ChAT-positive cells in the SG indicated that these neurotransmitter locally modulate the secretion of neurohormones that are synthesized in theXO.
Pigment-dispersing hormone in Daphnia interneurons, one type homologous to insect clock neurons displaying circadian rhythmicity
TLDR
This simple PDH system shows striking homologies to PDH systems in decapod crustaceans and well-known clock neurons in several insects, which suggests evolutionary conservation of an ancient peptidergic interneuronal system that is part of biological clocks.
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