HDAC9 and amyotrophic lateral sclerosis: To further assess the role of HDACs in the responses of arterial ECs under ALS, we perturbed HDACs expression by treating HUVECs with a HDAC inhibitor, sodium phenylbutyrate (PBA), and subjected PBA-treated HUVECs to ALS for 0, 1, 3, and 6 h.