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- W1988155570 abstract "The binding of ovine pituitary adenylate cyclase-activating peptide (PACAP-38) to rat lung membranes was investigated using [125I]PACAP-38 as radioligand. Binding was rapid at 37 degrees C, reversible, saturable, and time, concentration, and temperature dependent. Kinetic parameters derived from saturation experiments revealed a Kd = 100 +/- 15 pM, Bmax = 310 +/- 36 fmol/mg protein, and a Hill slope factor (nH) of 1.17 +/- 0.12. Various chemically synthesized analogues of PACAP-38, as well as related peptides, were tested for their ability to displace [125I]PACAP-38. Of those that had an IC50 < 0.2 microM, the following order of potency was determined: PACAP-38 (IC50 = 25 nM) > or = [Ile2]PACAP-38 (IC50 = 31 nM) > PACAP-27 (IC50 = 54 nM) > [Tyr1]PACAP-38 (IC50 = 104 nM) > GHRH(1-29)NH2 (IC50 = 108 nM) > PHI (IC50 = 181 nM) > [Ser2]PACAP(2-38) (IC50 = 198 nM). Glucagon, PHM, secretin, and GIP exhibited little affinity in the same binding assay. Vasoactive intestinal peptide (VIP) had an IC50 in excess of 1 microM. When [125I]VIP was used as radioligand, PACAP-27 had an IC50 = 0.2 nM > PACAP-38 (IC50 = 0.5 nM) > VIP (IC50 = 16 nM). A novel analog of PACAP-38, [4-Cl-D-Phe6,Leu17]PACAP-38, was able to displace [125I]VIP very efficiently (IC50 = 1 nM), but had little potency in displacing [125I]PACAP-38 (IC50 = 320 nM).(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
- W1988155570 created "2016-06-24" @default.
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- W1988155570 date "1993-05-01" @default.
- W1988155570 modified "2023-09-25" @default.
- W1988155570 title "Interaction of ovine pituitary adenylate cyclase-activating peptide (PACAP-38) with rat lung membranes" @default.
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- W1988155570 doi "https://doi.org/10.1016/0196-9781(93)90154-9" @default.
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