Identification of peripherin as a Akt substrate in neurons

Area of Science:

• Neuroscience
• Molecular Biology
• Cell Signaling

Background:

• Akt signaling pathways are vital for neuronal survival and regeneration.
• Identifying novel Akt substrates is key to understanding these processes.

Purpose of the Study:

• To identify novel substrates of Akt kinase.
• To investigate the role of Akt in neuronal regeneration.

Main Methods:

• Utilized PC12 cells overexpressing active Akt.
• Employed two-dimensional PAGE and mass spectrometry to identify proteins.
• Performed in vitro phosphorylation assays and co-immunoprecipitation.

Main Results:

• Identified peripherin, a neuronal intermediate filament protein, as a major Akt substrate.
• Determined the phosphorylation site on peripherin as Ser(66).
• Confirmed Akt interaction with peripherin's head domain and observed phosphorylated peripherin in nerve-injured neurons.

Conclusions:

• Peripherin is a novel in vivo substrate of Akt.
• Akt-mediated phosphorylation of peripherin may be important for motor nerve regeneration.