PKC controls HGF-dependent c-Met traffic, signalling and cell migration

Area of Science:

• Cell Biology
• Molecular Biology
• Cancer Research

Background:

• The HGF/c-Met pathway regulates cell growth, movement, and shape.
• Dysregulation of HGF/c-Met signaling is linked to cancer development.
• Protein kinase C (PKC) isotypes are key regulators of cellular processes.

Purpose of the Study:

• To investigate the interplay between c-Met receptor signaling and intracellular trafficking.
• To elucidate the specific roles of PKC isotypes in controlling c-Met-mediated signaling and traffic.
• To understand how PKC-mediated regulation impacts HGF-dependent cell migration.

Main Methods:

• Utilized cell-based assays to track c-Met receptor localization and signaling.
• Employed specific PKC isotype inhibitors to dissect their functions.
• Investigated the impact of PKC modulation on ERK cascade activation and focal complex formation.
• Analyzed microtubule-dependent c-Met sorting to the perinuclear region.

Main Results:

• c-Met signaling to the ERK cascade occurs within endosomes.
• PKCepsilon specifically controls endosomal ERK signaling and focal complex accumulation.
• PKCalpha regulates microtubule-dependent c-Met sorting to the perinuclear destination.
• Endosomal trafficking is crucial for HGF/c-Met-induced ERK response, but subsequent traffic is independent.

Conclusions:

• PKC isotypes differentially regulate c-Met receptor signaling and traffic.
• PKCepsilon controls dynamic signaling events essential for HGF-dependent migration.
• PKCalpha governs the later stages of c-Met receptor sorting.
• PKCs act as critical controllers of both receptor and signal trafficking in the HGF/c-Met pathway.