Human beta-endorphin: specific binding in neuroblastoma N18TG2 cells.
The mouse neuroblastoma N18TG2 has specific, saturable binding sites for human beta-endorphin (beta h-EP). The affinity and number of sites are 1.1 nM and 280,000 per cell, respectively, beta h-EP binding is not inhibited by [Leu]enkephalin or morphine at concentrations up to 0.1 mM; beta h-EP-(6--31) is a potent inhibitor of binding, and camel beta-EP is much less potent. The data suggest the importance of the nonenkephalin segment of the beta h-EP molecule for interaction with the binding site in N18TG2 cells.
D000818:Animals; D001667:Binding, Competitive; D002460:Cell Line; D004723:Endorphins / Q000378:metabolism*; D006801:Humans; D007700:Kinetics; D051379:Mice; D009374:Neoplasms, Experimental / Q000378:metabolism; D009447:Neuroblastoma / Q000378:metabolism*; D011957:Receptors, Opioid / Q000378:metabolism*; D001615:beta-Endorphin
D004723:Endorphins; D011957:Receptors, Opioid; D001615:beta-Endorphin