home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
The Arsenal Files 6
/
The Arsenal Files 6 (Arsenal Computer).ISO
/
health
/
med9605a.zip
/
M9650251.TXT
< prev
next >
Wrap
Text File
|
1996-03-09
|
3KB
|
47 lines
Document 0251
DOCN M9650251
TI HIV-1 envelope proteins gp120 and gp160 potentiate NMDA-induced [Ca2+]i
increase, alter [Ca2+]i homeostasis and induce neurotoxicity in human
embryonic neurons.
DT 9605
AU Lannuzel A; Lledo PM; Lamghitnia HO; Vincent JD; Tardieu M; Laboratoire
de Neurovirologie et Neuroimmunologie, UFR; Kremlin-Bicetre, Universite
Paris XI, Le Kremlin-Bicetre,; France.
SO Eur J Neurosci. 1995 Nov 1;7(11):2285-93. Unique Identifier : AIDSLINE
MED/96149639
AB The envelope glycoprotein gp120 of the human immunodeficiency virus
HIV-1 has been proposed to cause neuron death in developing murine
hippocampal cultures and rat retinal ganglion cells. In the present
study, cultured human embryonic cerebral and spinal neurons from 8- to
10-week-old embryos were used to study the neurotoxic effect of gp120
and gp160. Electrophysiological properties as well as
N-methyl-D-aspartate (NMDA)-induced current were recorded from neurons
maintained in culture for 10-30 days. Neither voltage-activated sodium
or calcium currents nor NMDA-induced currents were affected by exposure
of neurons to 250 pM gp120 or gp160. In contrast, when neurons were
subjected to photometric measurements using the calcium dye indo-1 to
monitor the intracellular free Ca2+ concentration ([Ca2+])i, gp120 and
gp160 (20-250 pM) potentiated the large rises in [Ca2+]i induced by 50
microM NMDA. The potentiation of NMDA-induced Ca2+ responses required
the presence of Ca2+ in the medium, and was abolished by the NMDA
antagonist D-2-amino-5-phosphonovalerate (AP5) and the voltage-gated
Ca2+ channel inhibitor nifedipine. Moreover, exposure of a subpopulation
of spinal neurons (25% of the cells tested) to 20-250 pM gp120 or gp160
resulted in an increase in [Ca2+]i that followed three patterns:
fluctuations not affected by AP5, a single peak, and the progressive and
irreversible rise of [Ca2+]i. The neurotoxicity of picomolar doses of
gp120 and gp160 cultures was estimated by immunofluorescence and
colorimetric assay. Treatment of cultures with AP5 or nifedipine reduced
gp120-induced toxicity by 70 and
DE Calcium/*METABOLISM Cells, Cultured Homeostasis/DRUG
EFFECTS/PHYSIOLOGY Human HIV Envelope Protein gp120/*PHARMACOLOGY
Membrane Potentials/DRUG EFFECTS/PHYSIOLOGY
N-Methylaspartate/*PHARMACOLOGY Neurons/*DRUG EFFECTS/PHYSIOLOGY
Patch-Clamp Techniques Prosencephalon/DRUG EFFECTS/PHYSIOLOGY Spinal
Cord/DRUG EFFECTS/PHYSIOLOGY Support, Non-U.S. Gov't Time Factors
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).