HSPA5 and Huntington disease: Upregulation of caspase-12 in CJD cell models and post-mortem patient cortex tissues (Hetz et al., 2003).Upregulation of ERp57, Grp94 and BiP in HD cell models and patient cortex tissues (Hetz et al., 2003). Increased intracellular calcium release from the ER (Torres et al., 2010).