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Axonal transport of neuropeptides: Retrograde tracing study in live cell cultures of rat sympathetic cervical ganglia.

In English

Författare

Summary, in English

Previous studies demonstrated that neuropeptides are transported with fast axonal transport. Considerable amounts (30-40%) of anterogradely transported peptides accumulated distal to a crush, apparently recycling to the cell bodies. In the present study, we used primary and compartmented cultures of sympathetic cervical ganglia (SCG) to address questions on the origin of the recycling peptides. In primary cultures, distinct labeling of neuropeptide Y (NPY) or secretoneurin (SN) immunoreactivities was detected in varicosities and in cell bodies, after administration of NPY or SN antibodies to the living cultures. Simultaneous addition to the medium with antibody against the N-terminal (lumen) domain of synaptotagmin, resulted in a partial overlapping between synaptotagmin and NPY/SN. In compartmented chamber cultures, in which cell body and proximal segments of the processes are restricted to the central chamber and the distal processes are present in peripheral compartments, antibody administration was performed in the peripheral compartment. KCl (60-120 mM) was added to the central chamber for 10 sec, followed by washing, and 30-60 min later clear labeling was detected in the cell bodies, suggesting that the antibodies were now present in structures that were transported from the distal segments in the peripheral compartment to the cell body. The results indicate 1) that peptide release from large dense cored vesicles is incomplete; 2) that the remaining peptides, together with the membrane, are retrogradely transported to cell bodies; and 3) that the recycling peptides accumulating distal to a crush of a peripheral nerve are most likely to be recycled from the nerve terminals.

Publiceringsår

2007

Språk

Engelska

Sidor

2538-2545

Publikation/Tidskrift/Serie

Journal of Neuroscience Research

Volym

85

Dokumenttyp

Artikel i tidskrift

Förlag

John Wiley & Sons Inc.

Ämne

  • Neurosciences

Nyckelord

  • axonal transport
  • peptide recycling
  • neuropeptide release
  • rat

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1097-4547