Platelet Rich Plasma-Derived Exosomal USP15 Promotes Cutaneous Wound Healing via Deubiquitinating EIF4A1
Abstract Background: Epithelial regeneration is an essential wound healing process, and recent work suggests that different types of exosomes (Exos) can be employed to improve wound repair outcomes by promoting such epithelial regeneration. Platelet-rich plasma (PRP) is known to facilitate enhanced wound healing, yet the mechanisms underlying its activity are poorly understood. Results: We found that PRP-derived exosomes (PRP-Exos) effectively promoted the in vitro proliferation, migration, and wound healing activity of human immortalized keratinocytes (HaCaT cells). USP15 was further identified as a key mediator through which these PRP-Exos were able to promote tissue repair both in vitro and in vivo. At a mechanistic level, USP15 enhanced the functional properties of HaCaT cells by promoting EIF4A1 deubiquitination. Conclusions: PRP-Exos and USP15 represent promising tools that can promote wound healing via enhancing epithelial regeneration.