Some effects of the venom of the Chilean spider Latrodectus mactans on endogenous ion-currents of Xenopus laevis oocytes.

Abstract:

:A study was made of the effects of the venom of the Chilean spider Latrodectus mactans on endogenous ion-currents of Xenopus laevis oocytes. 1 microg/ml of the venom made the resting plasma membrane potential more negative in cells voltage-clamped at -60 mV. The effect was potentially due to the closure of one or several conductances that were investigated further. Thus, we determined the effects of the venom on the following endogenous ionic-currents: (a) voltage-activated potassium currents, (b) voltage-activated chloride-currents, and (c) calcium-dependent chloride-currents (Tout). The results suggest that the venom exerts its action mainly on a transient outward potassium-current that is probably mediated by a Kv channel homologous to shaker. Consistent with the electrophysiological evidence we detected the expression of the mRNA coding for xKv1.1 in the oocytes.

authors

Parodi J,Romero F,Miledi R,Martínez-Torres A

doi

10.1016/j.bbrc.2008.08.070

subject

Has Abstract

pub_date

2008-10-31 00:00:00

pages

571-5

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(08)01582-9

journal_volume

375

pub_type

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