Consolidation of synaptic plasticity and memory requires biochemical alterations in the molecular composition of the synapse. The process of consolidation involves multiple processes including local translation of preexisting, dendritic mRNAs and results in changes in synaptic efficacy and storage of new memories that persist from days to years. While a few of the effectors of memory have been identified, relatively little is understood about how these molecules govern the induction of long-term forms of synaptic plasticity. We now show that Pin1, a cis-trans peptidyl-prolyl isomerase with specificity for Ser-Pro or Thr-Pro peptide bonds, plays a key role in synaptic plasticity. Pin1 is present in dendrites and spines and under basal conditions, suppresses dendritic protein synthesis. Glutamate signaling inactivates Pin1, leading to increased translation of many proteins including the plasticity related kinases PKMz and PKCz. In the genetic absence of Pin1, hippocampal L-LTP is increased as are the levels of PKMz and PKCz. PKMz and PKCz activity were necessary to maintain the suppression of Pin1 activity after glutamate signaling as well as dendritic translation. These data suggest glutamatergic signaling inhibits Pin1 which leads to the translation of PKMz and PKCz . Once produced, these kinases then support on-going dendritic translation partially by suppressing Pin1. As such our aims are to determine 1) the role of PKMz in regulating Pin1 and 2) further characterize PKMz function by identifying its downstream targets through chemical-genetics.

Public Health Relevance

In aggregate, these studies will greatly enhance our understanding of the molecular mechanisms that underlie learning, memory and synaptic plasticity. These processes are altered or lost in drug addiction.

Agency
National Institute of Health (NIH)
Institute
National Institute on Drug Abuse (NIDA)
Type
Research Project (R01)
Project #
1R01DA026067-01
Application #
7587857
Study Section
Special Emphasis Panel (ZDA1-EXL-T (10))
Program Officer
Pollock, Jonathan D
Project Start
2009-07-01
Project End
2011-06-30
Budget Start
2009-07-01
Budget End
2010-06-30
Support Year
1
Fiscal Year
2009
Total Cost
$371,250
Indirect Cost
Name
University of Wisconsin Madison
Department
Pathology
Type
Schools of Medicine
DUNS #
161202122
City
Madison
State
WI
Country
United States
Zip Code
53715
Westmark, Cara J; Malter, James S (2012) The regulation of AýýPP expression by RNA-binding proteins. Ageing Res Rev 11:450-9
Westmark, Pamela R; Westmark, Cara J; Jeevananthan, Athavi et al. (2011) Preparation of synaptoneurosomes from mouse cortex using a discontinuous percoll-sucrose density gradient. J Vis Exp :
Westmark, Cara J; Westmark, Pamela R; O'Riordan, Kenneth J et al. (2011) Reversal of fragile X phenotypes by manipulation of A?PP/A? levels in Fmr1KO mice. PLoS One 6:e26549
Malter, J S; Ray, B C; Westmark, P R et al. (2010) Fragile X Syndrome and Alzheimer's Disease: Another story about APP and beta-amyloid. Curr Alzheimer Res 7:200-6
Westmark, Cara J; Westmark, Pamela R; Malter, James S (2010) Alzheimer's disease and Down syndrome rodent models exhibit audiogenic seizures. J Alzheimers Dis 20:1009-13
Westmark, Pamela R; Westmark, Cara J; Wang, SuQing et al. (2010) Pin1 and PKMzeta sequentially control dendritic protein synthesis. Sci Signal 3:ra18
Westmark, Cara J; Westmark, Pamela R; Malter, James S (2009) MPEP reduces seizure severity in Fmr-1 KO mice over expressing human Abeta. Int J Clin Exp Pathol 3:56-68