DAPK1 induces motor neuron apoptosis in hSOD1G93A-linked amyotrophic lateral sclerosis via regulating the Xiap/JNK pathway.

Death-associated protein kinase 1 (DAPK1) is critically involved in regulating cell death in various neurodegenerative disorders. However, the role of DAPK1 in the pathogenesis of amyotrophic lateral sclerosis (ALS) remains unclear. Here, we found that the expression of DAPK1 significantly increased in ALS, showing a negative correlation with miR-501-3p. Upregulating DAPK1 led to an increase in motor neuron apoptosis by inhibiting Xiap. Conversely, silencing of DAPK1 protected motor neurons against hSOD1G93A-induced apoptosis by activating Xiap. Furthermore, we demonstrate that the neuroprotective impact of DAPK1-knockdown was inhibited by Embelin, an inhibitor of Xiap. These results suggest that modulating the DAPK1/Xiap signaling cascade protects motor neurons from apoptosis, indicating its potential as a therapeutic target in ALS. Significantly, these findings offer new directions for treatment options for ALS patients.