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Volume 17, Number 14,
Issue of July 15, 1997
pp. 5357-5365
Copyright ©1997 Society for Neuroscience
Postsynaptic Inhibitors of Calcium/Calmodulin-Dependent Protein
Kinase Type II Block Induction But Not Maintenance of Pairing-Induced
Long-Term Potentiation
Received Feb. 12, 1997; revised May 5, 1997; accepted May 7, 1997.
Nikolai Otmakhov,
Leslie C. Griffith, and
John E. Lisman
Volen Center for Complex Systems and Biology Department, Brandeis
University, Waltham, Massachusetts 02254
The role of postsynaptic kinases in the induction and maintenance
of long-term potentiation (LTP) was studied in the CA1 region of the
rat hippocampal slice. A peptide inhibitor for the catalytic domain of
calcium/calmodulin-dependent protein kinase type II (CaM-kinase) was
applied through a perfused patch pipette. The inhibitor completely
blocked both the short-term potentiation and LTP induced by a pairing
protocol. This indicates that the kinase or kinases affected by the
peptide are downstream from depolarization in the LTP cascade. The
ability to block LTP required that measures be taken to interfere with
degradation of the peptide kinase inhibitor by endogenous proteases;
either addition of protease inhibitors or modifications of the peptide
itself greatly enhanced the effectiveness of the peptide. Protease
inhibitors by themselves or control peptide did not block LTP
induction. To study the effect of kinase inhibitor on LTP maintenance,
we induced LTP in one pathway. Subsequent introduction of the kinase
inhibitor blocked the induction of LTP in a second pathway, but it did
not affect maintenance of LTP in the first. The implications for the
role of kinases in LTP maintenance are discussed.
Key words:
long-term potentiation;
calcium/calmodulin-dependent
kinase;
peptide inhibitors;
hippocampal slices;
whole-cell recording;
intracellular perfusion;
protease inhibitors;
fluorescent imaging
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