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J. Biol. Chem., Vol. 275, Issue 50, 39324-39331, December 15, 2000
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,
From the Synaptic Pharmaceutical Corporation, Paramus, New Jersey
07652
The central nervous system octapeptide,
neuropeptide FF (NPFF), is believed to play a role in pain modulation
and opiate tolerance. Two G protein-coupled receptors, NPFF1 and NPFF2,
were isolated from human and rat central nervous system tissues. NPFF
specifically bound to NPFF1 (Kd = 1.13 nM) and NPFF2 (Kd = 0.37 nM), and both receptors were activated by NPFF in a variety of heterologous expression systems. The localization of mRNA and binding sites of these receptors in the dorsal horn of the spinal cord,
the lateral hypothalamus, the spinal trigeminal nuclei, and the
thalamic nuclei supports a role for NPFF in pain modulation. Among the
receptors with the highest amino acid sequence homology to NPFF1 and
NPFF2 are members of the orexin, NPY, and cholecystokinin families, which have been implicated in feeding. These similarities together with the finding that BIBP3226, an anorexigenic Y1 receptor ligand, also binds to NPFF1 suggest a potential role for NPFF1 in
feeding. The identification of NPFF1 and NPFF2 will help delineate their roles in these and other physiological functions.
The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EMBL Data Bank with accession number(s) AF268898, AF268899, AF268900, and AF268901.
To whom correspondence should be addressed: Synaptic
Pharmaceutical Corp., 215 College Rd., Paramus, NJ 07652. Tel.:
201-261-1331, ext. 733; Fax: 201-261-0623; E-mail:
jbonini@synapticcorp.com.
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