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Polyamines modulate the function of transfected glutamate receptor mGluR1a
R M Manev1, N Gabellini, H Manev
1Fidia Research Laboratories, Abano Terme (PD), Italy.
Neuroreport
|June 1, 1993
Summary
The metabotropic glutamate receptor mGluR1a mediates phosphoinositide hydrolysis. Polyamines like spermine and spermidine modulate this receptor's response to 1S,3R-ACPD, enhancing its signaling pathway.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Metabotropic glutamate receptors (mGluRs) are G protein-coupled receptors involved in neurotransmission.
- mGluR1a is a specific subtype implicated in various neuronal functions.
- Phosphoinositide (PI) hydrolysis is a key second messenger pathway regulated by certain G protein-coupled receptors.
Purpose of the Study:
- To investigate the functional expression of metabotropic glutamate receptor mGluR1a in human cells.
- To examine the effect of 1S,3R-aminocyclopentane-1,3-dicarboxylic acid (1S,3R-ACPD) on PI hydrolysis mediated by mGluR1a.
- To determine the modulatory role of polyamines, specifically spermine, on mGluR1a-stimulated PI hydrolysis.
Main Methods:
- Expression of mGluR1a in human embryonic kidney 293 cells.
- Dose-dependent stimulation of PI hydrolysis using 1S,3R-ACPD.
- Assessment of polyamine effects (spermine, spermidine, putrescine) on PI hydrolysis with and without 1S,3R-ACPD.
Main Results:
- 1S,3R-ACPD dose-dependently stimulated PI hydrolysis exclusively in cells expressing mGluR1a.
- Spermine (10 microM) significantly potentiated the stimulatory effect of 1S,3R-ACPD on PI hydrolysis.
- Spermidine mimicked spermine's potentiating effect, while putrescine did not.
Conclusions:
- Human embryonic kidney 293 cells provide a model system for studying mGluR1a function.
- mGluR1a activation by 1S,3R-ACPD leads to PI hydrolysis.
- Polyamines spermine and spermidine act as positive modulators of mGluR1a signaling, influencing PI hydrolysis.