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The galanin-receptor ligand M40 [galanin-(1-12)-Pro3-(Ala-Leu)2-Ala amide] binds with high affinity to [mono[125I]iodo-Tyr26]galanin-binding sites in hippocampal, hypothalamic, and spinal cord membranes and in membranes from Rin m5F rat insulinoma cells (IC50 = 3-15 nM). Receptor autoradiographic studies show that M40 (1 microM) displaces(More)
The chimeric peptide M35 [galanin(1-13)-bradykinin(2-9) amide] is a high-affinity galanin receptor ligand acting as a galanin receptor antagonist in the rat spinal cord, rat hippocampus and isolated mouse pancreatic islets. We have radiolabelled M35 and performed equilibrium binding studies with [125I]M35 on the rat pancreatic beta-cell line Rin m 5F,(More)
The presence of a single class of high affinity, saturable binding sites for [3H]neuropeptide Y (NPY) was demonstrated in membranes from human frontal and temporal cortex. The specific binding of [3H]NPY was sensitive to guanosine 5'-triphosphate (GTP) and guanylyl-imidodiphosphate (GMPP(NH)P; 100 microM) which lowered the total binding capacity (Bmax)(More)
Receptors for the 29-amino-acid peptide, galanin, in membranes from the rat ventral hippocampus were examined using chloramine-T-iodinated porcine galanin as ligand. The equilibrium binding of 125I-galanin showed the presence of a high-affinity binding site (Kd = 1.91 +/- 0.40 nM). The concentration of the high-affinity-binding sites was 107 +/- 15 fmol/mg(More)
The equilibrium binding of [3H]propionyl neuropeptide Y ([ 3H]pNPY) to receptors in a crude synaptic membrane preparation from the rat striatum was influenced by GTP, which caused an apparent loss of high-affinity binding sites for [3H]pNPY. In the presence of GTP (10(-5) M), NPY and peptide YY (PYY) inhibited basal and forskolin-stimulated adenylate(More)
We have previously reported that galanin message-associated peptide (GMAP), a fragment of galanin precursor protein, occurs in a limited number of dorsal root ganglion (DRG) cells in rats with intact sciatic nerves. In the present study, the localization of GMAP in dorsal root ganglia, dorsal roots and dorsal horn was analyzed immunohistochemically and(More)
Circular dichroism spectroscopy has been used to study how different solvents stabilize secondary structure in the neuropeptide galanin (rat), two N-terminal fragments of galanin, galanin(1-12) and galanin(1-16), and six other differently charged analogs. Among these analogs, the peptide M40, galanin(1-13)-Pro-Pro-Ala-Leu-Ala-Leu-Ala amide, is a high(More)
We have examined the effects of intrathecal (i.t.) galanin message-associated peptide (GMAP), the C-terminal flanking peptide in the galanin (GAL) precursor protein, which is produced in equimolar quantities with galanin and which is upregulated upon axotomy, on the spinal nociceptive flexor reflex in decerebrate, spinalized, unanesthetized rats. I.t. GMAP(More)
Rose Bengal mediated photooxidation of mitochondrial F1-ATPase and its beta-subunit resulted in inactivation and loss of about 50 and 60% of their histidine residues, respectively. The beta-subunit was not cleaved upon photooxidation. Photooxidation of histidine probably results in changes in the conformational stability of F1-ATPase leading to its(More)
We have previously reported that galanin message-associated peptide (GMAP), a fragment of galanin precursor protein, is present in dorsal root ganglion cells and upon intrathecal (i.t.) administration influences the spinal nociceptive flexor reflex in a complex manner in the rat. GMAP elicited a moderate facilitation of the flexor reflex, but when(More)
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