Binding of anti-acetylcholine receptor antibodies inhibits the acetylcholine receptor mediated cation flux.

Abstract:

:A fast kinetics, spectroscopic technique has been applied to the study of the transient cation flux associated to the binding of cholinergic agonist to native acetylcholine receptor (AcChR)-rich membrane vesicles in presence of anti-AcChR antibodies. The technique is based on the collisional quenching of an intravesicularly trapped fluorophore by externally added T1+ which substitutes for physiologically occurring cations. Presence of polyclonal Fab fragments from goat anti-AcChR antibodies bound to the membrane AcChR promotes a 80-90% inhibition on the observed rate constants of T1+ influx. The observed inhibition process appears to follow a non-competitive pattern between antibody and cholinergic ligand binding, suggesting that in the AcChR protein the antigenic sites responsible for ion translocation may be other than those involved in ligand binding.

authors

Gonzalez-Ros JM,Ferragut JA,Martinez-Carrion M

doi

10.1016/0006-291x(84)91263-4

subject

Has Abstract

pub_date

1984-04-30 00:00:00

pages

368-75

issue

2

eissn

0006-291X

issn

1090-2104

pii

0006-291X(84)91263-4

journal_volume

120

pub_type

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