HDAC6 and pulmonary arterial hypertension: To further strengthen the role of HDAC6 in the context of Bax-mediated cell death, PAH-PASMCs were pre-treated with a cell permeable Bax-inhibiting peptide (BIP)-V5 designed from the Bax inhibiting domain of Ku7035 followed by HDAC6 inhibition under starvation conditions.