A Golgi-based KDELR-dependent signalling pathway controls extracellular matrix degradation

Area of Science:

• Cell Biology
• Molecular Biology
• Cancer Research

Background:

• The KDEL receptor (KDELR) is known to regulate endomembrane system signaling.
• Src kinases play a critical role in cellular processes including extracellular matrix (ECM) degradation.
• Invadopodia are specialized actin-rich structures crucial for ECM degradation during cancer cell invasion.

Purpose of the Study:

• To investigate the role of the KDELR-Src signaling pathway in regulating ECM degradation by cancer cells.
• To determine how KDELR activation influences the formation and function of invadopodia.

Main Methods:

• Utilized cell culture models of cancer.
• Employed techniques to study KDELR activation and Src signaling.
• Analyzed invadopodia formation and ECM degradation assays.
• Investigated phosphorylation of Src substrates cortactin and ASAP1.

Main Results:

• Activation of the KDELR leads to increased formation of invadopodia in cancer cells.
• The KDELR pathway induces Src activation specifically at invadopodia.
• KDELR-mediated Src activation results in the phosphorylation of cortactin and ASAP1, essential for ECM degradation.
• This pathway is crucial for both basal and KDELR-stimulated ECM degradation.

Conclusions:

• The KDELR-Src pathway is a key regulator of invadopodia-dependent ECM degradation.
• This signaling cascade represents a novel mechanism contributing to cancer cell invasion and metastasis.
• Targeting the KDELR-Src pathway could offer new therapeutic strategies for invasive cancers.