Contributions of T Cell Signaling for Wound Healing.

It has long been known that T cells participate in wound healing; however, the landscape of the signaling derived from T cells in the process of wound healing is still enigmatic. With the advantages of scRNA-seq, in combination with immunofluorescent imaging, we identified activated T cells, cytotoxic T cells (CTLs), exhausting T cells, and Tregs existing in the inflammation phase of wound healing. Further analysis revealed each T cell population possess distinguished signals contributed to wound healing, some are critical for improving the wound healing quality. Besides, this study discovered and validated the existence of exhausting T cells among the T cells accumulated in the skin during wound healing, and the molecular mechanism(s) and contribution of exhausting T cells to wound healing deserve extensive studies in the future.