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The Journal of Neurophysiology Vol. 88 No. 3 September 2002, pp. 1270-1278
Copyright ©2002 by the American Physiological Society
1Center for Neurobiology and Behavior, College of Physicians and Surgeons, Columbia University; and 2New York State Psychiatric Institute, New York, New York 10032
Lu, Yun-Fei and
Robert D. Hawkins.
Ryanodine Receptors Contribute to cGMP-Induced Late-Phase LTP and
CREB Phosphorylation in the Hippocampus. J. Neurophysiol. 88: 1270-1278, 2002. We previously found that the
nitric oxide (NO)-cGMP-cGMP-dependent protein kinase (PKG) signaling
pathway acts in parallel with the cAMP-cAMP-dependent protein kinase
(PKA) pathway to produce protein and RNA synthesis-dependent late-phase
long-term potentiation (L-LTP) and cAMP response element-binding
protein (CREB) phosphorylation in the CA1 region of mouse
hippocampus. We have now investigated the possible involvement of a
downstream target of PKG, ryanodine receptors. L-LTP can be induced by
either multiple-train tetanization, NO or 8-Br-cGMP paired with
one-train tetanization, or the cAMP activator forskolin, and all three
types of potentiation are accompanied by an increase in phospho-CREB
immunofluorescence in the CA1 cell body area. Both the potentiation and
the increase in phospho-CREB immunofluorescence induced by
multiple-train tetanization or 8-Br-cGMP paired with one-train
tetanization are reduced by prolonged perfusion with ryanodine, which
blocks Ca2+ release from ryanodine-sensitive
Ca2+ stores. By contrast, neither the
potentiation nor the increase in immunofluorescence induced by
forskolin are reduced by depletion of ryanodine and
inositol-1,4,5-triphosphate (IP3)-sensitive
Ca2+ stores. These results suggest that NO, cGMP,
and PKG cause release of Ca2+ from
ryanodine-sensitive stores, which in turn causes phosphorylation of
CREB in parallel with PKA during the induction of
L-LTP.
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