Jez M, Ciesla M, Stepniewski J, Langrzyk A, Muchova L, Vitek L, Jozkowicz A, Dulak J. Valproic acid downregulates heme oxygenase-1 independently of Nrf2 by increasing ubiquitination and proteasomal degradation. Biochemical and Biophysical Research Communications. 2017 Mar;485(1):160–6. doi: 10.1016/j.bbrc.2017.02.041.