DEPTOR and Miyoshi myopathy: We also found significantly increased levels of apoptosis induced by Dex in RPMI8226 cells in the presence of CQ, both in the control shRNA and HMGB1 knockdown groups; in the presence of CQ, there was no significant difference in Dex-induced cell apoptosis between the two groups, which suggested that HMGB1 may play a role in MM drug resistance by regulating autophagy through the DEPTOR/mTOR/Akt pathway.