HDAC9 and atherosclerosis: Furthermore, Jiang et al. [16] reported higher expression levels of histone deacetylase 7 (HDAC7) and histone deacetylase 9 (HDAC9), whereas the expression levels of P300, adenosine triphosphate binding cassette transporter A1 (ABCA1), adenosine triphosphate binding cassette transporter G1 (ABCG1), and peroxidase proliferator-activated receptor-γ (PPAR-γ) were found to decrease in atherosclerosis; moreover, HDAC9 reduction resulted in a decrease in levels of proinflammatory cytokines and significantly more M2 macrophages [17, 18].