Journal of Molecular Neuroscience

, Volume 28, Issue 3, pp 277–284

Peptidomics of Cpefat/fat mouse hypothalamus and striatum

Effect of chronic morphine administration
  • Fabien M. Décaillot
  • Fa-Yun Che
  • Lloyd D. Fricker
  • Lakshmi A. Devi
Original Article

DOI: 10.1385/JMN:28:3:277

Cite this article as:
Décaillot, F.M., Che, FY., Fricker, L.D. et al. J Mol Neurosci (2006) 28: 277. doi:10.1385/JMN:28:3:277

Abstract

Chronic morphine administration is known to affect several neuropeptide systems, and this could contribute to the behavioral effects of opiates. To quantitate global changes in neuropeptide levels upon chronic morphine administration, we took advantage of a method that allows selective isolation of neuropeptides from brains of mice lacking carboxypeptidase E (Cpefat/fat mice), a critical enzyme in the generation of many neuroendocrine peptides. We used a differential labeling procedure with stable isotopic tags and mass spectrometry to quantitate the relative changes in a number of hypothalamic and striatal peptides in Cpefat/fat mice chronically treated with morphine. A total of 27 distinct peptides were detected in hypothalamus and striatum. Of these, 27 were identified by mass spectrometry-based sequencing, 1 was tentatively identified by the mass and charge, and 9 were not identified. The identified peptides included fragments of proenkephalin, prothyrotropin-releasing hormone, secretogranin II, chromogranin A and B, protachykinin B, provasopressin, promelanin concentrating hormone, and pro-SAAS. Upon morphine administration, although the levels of most of the peptides were unaltered (within a factor of 1.3 to 0.7 compared with saline control), the levels of a small number of peptides did show consistent changes (increased or decreased by 1.3-fold or more) in hypothalamus and/or striatum. Taken together, these results provide interesting insights into endogenous neuropeptide systems that are modulated by morphine and suggest further experiments to link candidate peptides with long-term effects of morphine.

Index Entries

Neuropeptides opiate morphine mass spectrometry drug addiction 

Copyright information

© Humana Press Inc 2006

Authors and Affiliations

  • Fabien M. Décaillot
    • 1
  • Fa-Yun Che
    • 2
  • Lloyd D. Fricker
    • 2
  • Lakshmi A. Devi
    • 1
  1. 1.Department of Pharmacology and Biological ChemistryMount Sinai School of MedicineNew York
  2. 2.Department of Molecular PharmacologyAlbert Einstein College of MedicineBronx

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