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Tyrosine dephosphorylation underlies DHPG-induced LTD
Peter R Moult1, Rebecca Schnabel, Ian C Kilpatrick
1MRC Centre for Synaptic Plasticity, Department of Anatomy, University of Bristol, University Walk, Bristol BS8 1TD, UK. P.R.Moult@bris.ac.uk
Neuropharmacology
|September 6, 2002
Summary
This study reveals that protein tyrosine phosphatases, not kinases, are crucial for long-term depression (LTD) in the hippocampus. Inhibiting these phosphatases blocked DHPG-induced LTD, suggesting their activation is key.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Long-term depression (LTD) of synaptic transmission is a key form of synaptic plasticity.
- Group I metabotropic glutamate (mGlu) receptor agonist (RS)-3,5-dihydroxyphenylglycine (DHPG) can induce LTD in the CA1 hippocampus.
- The precise molecular mechanisms underlying DHPG-induced LTD are under active investigation.
Purpose of the Study:
- To investigate the role of protein tyrosine kinases (PTKs) and protein tyrosine phosphatases (PTPs) in the induction and expression of DHPG-induced LTD in the CA1 hippocampus.
Main Methods:
- Application of DHPG to induce LTD.
- Inhibition of PTKs using lavendustin A and genistein.
- Inhibition of PTPs using orthovanadate and phenyl-arsine oxide.
- Assessment of the effects of inhibitors on DHPG-induced LTD.
Main Results:
- PTK inhibitors (lavendustin A, genistein) showed minimal impact on DHPG-induced LTD.
- PTP inhibitors (orthovanadate, phenyl-arsine oxide) significantly inhibited DHPG-induced LTD.
- These findings implicate PTPs in the signaling pathway of DHPG-induced LTD.
Conclusions:
- DHPG-induced LTD in the CA1 hippocampus involves the activation of protein tyrosine phosphatases.
- Protein tyrosine phosphatases play a critical role in the expression or induction of this form of synaptic plasticity.