Title: Modulation of rhythmic motor activity by pyrokinin peptides
Authors: Saideman, Shari R ×
Ma, Mingming
Kutz-Naber, Kimberly K
Cook, Aaron
Torfs, Pieter
Schoofs, Liliane
Li, Lingjun
Nusbaum, Michael P #
Issue Date: Jan-2007
Publisher: The Society
Series Title: Journal of Neurophysiology vol:97 issue:1 pages:579-595
Abstract: Pyrokinin (PK) peptides localize to the central and peripheral nervous systems of arthropods, but their actions in the CNS have yet to be studied in any species. Here, we identify PK peptide family members in the crab Cancer borealis and characterize their actions on the gastric mill ( chewing) and pyloric ( filtering) motor circuits in the stomatogastric ganglion (STG). We identified PK-like immunolabeling in the STG neuropil, in projection neuron inputs to this ganglion, and in the neuroendocrine pericardial organs. By combining MALDI mass spectrometry ( MS) and ESI tandem MS techniques, we identified the amino acid sequences of two C. borealis pyrokinins ( CabPK-I, CabPK- II). Both CabPKs contain the PK family-specific carboxyterminal amino acid sequence ( FXPRLamide). PK superfusion to the isolated STG had little influence on the pyloric rhythm but excited many gastric mill neurons and consistently activated the gastric mill rhythm. Both CabPKs had comparable actions in the STG and these actions were equivalent to those of Pevpyrokinin ( shrimp) and Leucopyrokinin ( cockroach). The PK-elicited gastric mill rhythm usually occurred without activation of the projection neuron MCN1. MCN1, which does not contain CabPKs, effectively drives the gastric mill rhythm and at such times is also a gastric mill central pattern generator (CPG) neuron. Because the PK-elicited gastric mill rhythm is independent of MCN1, the underlying core CPG of this rhythm is different from the one responsible for the MCN1-elicited rhythm. Thus neuromodulation, which commonly alters motor circuit output without changing the core CPG, can also change the composition of this core circuit.
ISSN: 0022-3077
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Animal Physiology and Neurobiology Section - miscellaneous
× corresponding author
# (joint) last author

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