Abstract
Memory consolidation requires synaptic reconfiguration dependent upon extracellular matrix (ECM)
molecules interacting with cell adhesion molecules. Matrix metalloproteinase (MMP) activity is responsible
for transient alterations in the ECM that may be prerequisite to hippocampal-dependent learning. In support
of this hypothesis we have measured increases in MMP-3 and MMP-9 levels within the hippocampus and
prefrontal cortex during Morris water maze training. The present investigation extends these findings by
determining that infusion of an MMP inhibitor (FN-439) into the dorsal hippocampus disrupted acquisition
of this task. In vitro fluorescence enzyme assays to determine the specificity of FN-439
against the catalytic domains of MMP-3 and MMP-9 indicated mean