Subunit-dependent inhibition of recombinant rodent N-methyl-D-aspartate receptors by a HIV-1 glycoprotein 120 derived peptide.

Abstract:

:Considerable evidence suggests that low (picomolar) concentrations of the HIV-1 envelope glycoprotein gp120 induce neuronal cell death by stimulating the release of microglial toxins, which in turn activate N-methyl-D-aspartate (NMDA) receptors. Conversely, high (micromolar) concentrations of gp120 have been reported to directly inhibit NMDA receptor-mediated currents and do not induce neurotoxicity. Here we show that micromolar concentrations of a synthetic peptide corresponding to the V3-loop of gp120 (V3-pep) inhibited agonist responses of recombinant heteromeric rodent NMDA receptors expressed in Xenopus laevis oocytes by decreasing their apparent glycine affinity. Different combinations of NMDA receptor subunits displayed differential sensitivities to inhibition by V3-pep, with a potency rank order of NR1/2B > NR1/2D > NR1/2C > or = NR1/2A. Our observations may provide an explanation for the reduced neurotoxicity of high doses of gp120 in cell cultures and may be useful for the pharmacological discrimination of NMDA receptor subtypes.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Wittekindt B,Betz H,Laube B

doi

10.1016/s0304-3940(00)00775-8

keywords:

subject

Has Abstract

pub_date

2000-02-18 00:00:00

pages

151-4

issue

2

eissn

0304-3940

issn

1872-7972

pii

S0304-3940(00)00775-8

journal_volume

280

pub_type

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