Abstract
Death-associated protein kinase (DAPK) is a pro-apoptotic, calmodulin (CaM)-regulated protein kinase whose mRNA levels increase following cerebral ischemia. However, the relationship between DAPK catalytic activity and cerebral ischemia is not known. This knowledge is critical as DAPK function is dependent on the catalytic activity of its kinase domain. Consequently, we examined DAPK catalytic activity in a rat model of neonatal cerebral hypoxia-ischemia (HI). An increase in DAPK specific activity was found in homogenates of the hippocampus from the injured right hemisphere, compared to the uninjured left hemisphere, 7 days after injury. The results raised the possibility that an upregulation of DAPK activity might be associated with the recovery phase of HI, during which neuronal repair and differentiation are initiated. Therefore, we examined the change of DAPK in an experimentally tractable cell culture model of neuronal differentiation. We found that DAPK catalytic activity and protein levels increase after nerve growth factor (NGF)-induced differentiation of rat PC12 cells. These results suggest that DAPK may have a previously unappreciated role in neuronal development or recovery from injury, and that potential future therapies targeting DAPK should consider a restricted time window.
Original language | English (US) |
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Pages (from-to) | 128-137 |
Number of pages | 10 |
Journal | Biochimica et Biophysica Acta - Proteins and Proteomics |
Volume | 1600 |
Issue number | 1-2 |
DOIs | |
State | Published - Nov 4 2002 |
Funding
These studies were supported in part by grants from the Alzheimer's Association, the Institute for the Study of Aging, the Women's Board of Children's Memorial Hospital (MSW) and the National Institutes of Health (AG00260 and RR13810). AMS is a predoctoral scholar and AVV is a postdoctoral scholar in the Drug Discovery Training Program.
Keywords
- Calcium
- Calmodulin
- Death-associated protein kinase
- Differentiation
- Kinase inhibitor
- Neuron
- Perinatal cerebral hypoxia-ischemia
- Stroke
ASJC Scopus subject areas
- Analytical Chemistry
- Molecular Biology
- Biophysics
- Biochemistry