Journal
JOURNAL OF NEUROSCIENCE
Volume 25, Issue 49, Pages 11330-11339Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.2313-05.2005
Keywords
cellular prion protein; MAPK; neuritogenesis; neuroprotection; PKA; STI1
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Understanding the physiological function of the cellular prion (PrPc) depends on the investigation of PrPc- interacting proteins. Stress-inducible protein 1 (STI1) is a specific PrPc ligand that promotes neuroprotection of retinal neurons through cAMP-dependent protein kinase A (PKA). Here, weexamined the signaling pathways and functional consequences of the PrPc interaction with STI1 in hippocampal neurons. Both PrPc and STI1 are abundantly expressed and highly colocalized in the hippocampus in situ, indicating that they can interact in vivo. Recombinant STI1 (His(6)-STI1) added to hippocampal cultures interacts with PrPc at the neuronal surface and elicits neuritogenesis in wild-type neurons but not in PrPc- null cells. This effect was abolished by antibodies against either PrPc or STI1 and was dependent on the STI1 domain that binds PrPc. Binding of these proteins induced the phosphorylation/activation of the mitogenactivated protein kinase, which was essential for STI1-promoted neuritogenesis. His(6)-STI1, but not its counterpart lacking the PrPc binding site, prevented cell death via PKA activation. These results demonstrate that two parallel effects of the PrPc-STI1 interaction, neuritogenesis and neuroprotection, are mediated by distinct signaling pathways.
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