Melanoma migration is promoted by prion protein via Akt-hsp27 signaling axis

Area of Science:

• Oncology
• Cell Biology
• Biochemistry

Background:

• Metastatic melanoma presents a significant clinical challenge with poor patient prognosis.
• Prion protein (PrP) is implicated in melanoma cell migration and invasion, partly through interaction with filamin A (FLNa).

Purpose of the Study:

• To investigate the role of PrP in melanoma cell mobility independently of its interaction with FLNa.
• To elucidate the molecular mechanisms by which PrP influences cell migration.

Main Methods:

• Utilized CRISPR-Cas9 to knock out the PRNP gene in M2 melanoma cells, which naturally lack FLNa expression.
• Assessed cell motility, protein expression levels (Akt, phosphorylated hsp27), and F-actin polymerization.
• Re-expressed PrP in PRNP-null cells to confirm findings.

Main Results:

• PRNP deletion significantly reduced M2 melanoma cell motility.
• PrP deficiency led to decreased Akt levels and reduced phosphorylation of small heat shock protein (hsp27).
• This resulted in altered F-actin polymerization, hindering cell migration.

Conclusions:

• Prion protein (PrP) plays a crucial role in cytoskeletal organization and tumor cell migration in melanoma, independent of FLNa.
• PrP modulates cell motility through the Akt-hsp27-F-actin signaling axis.
• Targeting PrP may offer a therapeutic strategy for metastatic melanoma.