A study in young human patients with acute coronary syndrome (ACS) demonstrated that plasma levels of the mir-134 were significantly down-regulated (5-fold) in patients with ST-segment elevated myocardial infarction (STEMI) compared to healthy controls, with its expression inversely correlated with plasma troponin I levels and showing a discriminatory power (AUC=0.796) for STEMI diagnosis [Tong et al. DOI:10.3390/ijms19051467]. In human skin, the mir-134 was found to be up-regulated four days post-burn in deep partial thickness burn skin compared to normal skin and was also up-regulated in burn hypertrophic scar tissue, while a separate investigation reported its up-regulation in heat-shocked skin epidermal stem cells six hours post-burn [Siu et al. DOI:10.1111/wrr.13100]. A study in mice demonstrated that 174 mature exosomal miRNAs were differentially expressed in cardiac tissue following acute myocardial infarction, with in vitro validation showing that mimics of 19 out of 20 selected miRNAs, including the mir-134, significantly reduced hypoxic stress-induced cell death in primary cardiomyocytes [Jung et al. DOI:10.3390/biomedicines12020430]. In a rat model of Alzheimer's disease, elevated brain levels of the mir-134 were significantly downregulated by treatment with astaxanthin-loaded invasomes, which concurrently improved memory and modulated the SIRT-1/BDNF/GSK-3β signaling pathway [Kandeil et al. DOI:10.1007/S12035-025-05241-5].