Dynamin-related protein 1 differentially regulates FcεRI- and substance P-induced mast cell activation

Area of Science:

• Immunology
• Cell Biology
• Mitochondrial Dynamics

Background:

• Mitochondrial fission protein dynamin-related protein 1 (Drp1) role in mast cell (MC) activation is unclear.
• Previous studies suggested Drp1 regulates MC activation by specific stimuli in vitro.

Purpose of the Study:

• To investigate Drp1 function in both mouse and human mast cells.
• To elucidate Drp1's role in mast cell activation by diverse stimuli in vivo.

Main Methods:

• Utilized human peripheral blood-derived cultured mast cells.
• Employed two genetic mouse models with mast cell-specific Drp1 depletion (Drp1fl/flMcpt5cre+/- and Drp1fl/flCpa3cre+/- mice).
• Assessed mast cell activation in vitro and in vivo.

Main Results:

• Drp1 depletion enhanced FcεRI-induced mast cell activation in mice.
• Drp1 depletion suppressed substance P-stimulated mast cell activation in mice, in vitro and in vivo.
• Pharmacologic Drp1 inhibition mimicked these effects in human mast cells.

Conclusions:

• Drp1 plays a differential role in regulating mast cell activation based on the stimulus.
• Enhancing Drp1 activity could be a therapeutic strategy for IgE-dependent mast cell activation.
• Inhibiting Drp1 may offer a therapeutic approach for conditions involving substance P-mediated mast cell responses.