HP and acute kidney injury: In a recent series of studies [8]–[10], we made the surprising observation that, in addition to the above, three stress proteins that are either exclusively, or predominantly, expressed in liver (α-fetoprotein, haptoglobin, hemopexin), are also rapidly induced in mouse proximal tubules in response to ischemic and toxic (maleate, glycerol, and cisplatin) AKI.