par Gourlet, Philippe 
;De Neef, Philippe ;Woussen Colle, Marie-Claire ;Vandermeers, André ;Vandermeers-Piret, Marie-Claire ;Robberecht, Patrick ;Christophe, Jean
Référence Biochimica et biophysica acta. Biomembranes, 1066, 2, page (245-251)
Publication Publié, 1991
;De Neef, Philippe ;Woussen Colle, Marie-Claire ;Vandermeers, André ;Vandermeers-Piret, Marie-Claire ;Robberecht, Patrick ;Christophe, Jean Référence Biochimica et biophysica acta. Biomembranes, 1066, 2, page (245-251)
Publication Publié, 1991
Article révisé par les pairs
| Résumé : | Competition binding curves, using [125I-acetyl-His1]PACAP-27 as radioligand and dose-effect curves of adenylate cyclase activation in human SUP-T1 lymphoblastic membranes showed that PACAP-27 and PACAP-38 stimulate the enzyme through a single class of helodermin-preferring VIP receptors with the following order of potency: helodermin = [acetyl-His1]PACAP-27 > PACAP-38 > PACAP-27 > VIP. PACAP (6-27) (K(i) 0.5-0.8 μM) and [Des-His1,Asn3]PACAP-27 (K(i) 1-2 μM) acted as competitive antagonists. Using a series of 13 PACAP-27 analogues and fragments and three VIP analogues, we identified positions 1, 2, 3, 9 and 13 in PACAP-27 as being of importance for high-affinity binding. Thus, we added further evidence for considering that the present helodermin-preferring VIP receptors, when compared to a majority of VIP receptors and PACAP receptors, exhibit an original specificity pattern. |
