A study in mice demonstrated that plasma exosomes after traumatic brain injury (TBI) promote osteoblast proliferation and differentiation, with the miR-378c being highly expressed in these exosomes [Yang et al. DOI:10.1016/j.jot.2021.09.003]. In human skin, the miR-378c was found to be downregulated four days post-burn in deep partial thickness burn skin compared to normal skin [Siu et al. DOI:10.1111/wrr.13100]. In a separate investigation in mice, the miR-378c was significantly downregulated in the nucleus accumbens of methamphetamine-sensitized animals, while its precursor showed no significant change, indicating a post-transcriptional regulatory mechanism involving the downregulation of Ago2 [Liu et al. DOI:10.1111/Adb.12616].