HSPA5 and serum lipopolysaccharide activity: Western blot analyses revealed greater GRP78, phopho-IRE1α, phosphor-PERK, and cleaved ATF-6 expression in mice with endotoxemia subjected to VT = 30 mL/kg than in those without endotoxemia subjected to VT = 30 mL/kg and the nonventilated control mice (Figure 2E–H).