ShcD Binds DOCK4, Promotes Ameboid Motility and Metastasis Dissemination, Predicting Poor Prognosis in Melanoma

Area of Science:

• Oncology
• Molecular Biology
• Cell Biology

Background:

• Metastasis is the leading cause of cancer mortality, with underlying mechanisms poorly understood.
• Melanoma metastasis involves genetic/epigenetic changes and specific signaling pathways.
• The role of Shc adaptor protein D (ShcD) in melanoma metastasis requires investigation.

Purpose of the Study:

• To investigate the role of ShcD in melanoma cell metastatic properties.
• To explore ShcD's impact on cell morphology, invasion, and metastasis formation.
• To elucidate the molecular mechanisms by which ShcD influences melanoma progression.

Main Methods:

• Utilized patient-derived xenografts (PDXs) for melanoma research.
• Manipulated ShcD expression (depletion and overexpression) in melanoma cells.
• Assessed cell shape, extracellular matrix adhesion, invasion (collagen gel), and metastasis in vivo.
• Investigated the Rac1 signaling pathway and DOCK4 localization.

Main Results:

• ShcD depletion increased cell spread and extracellular matrix adhesion.
• ShcD overexpression induced rounded morphology on 3D matrices, enhanced invasion, and promoted metastasis.
• ShcD overexpression sustained amoeboid movement by inhibiting Rac1 signaling via cytoplasmic confinement of DOCK4.
• Inactivating ShcD signaling sensitized melanoma cells to therapy.
• High ShcD expression correlated with poor patient outcomes.

Conclusions:

• ShcD plays a critical role in promoting melanoma cell invasiveness and metastasis.
• Targeting the ShcD signaling pathway may offer a therapeutic strategy for melanoma.
• ShcD expression serves as a prognostic biomarker for melanoma patients.