Provided herein are polypeptides comprising or consisting essentially of a QSYDNTLSGSYVF (SEQ ID NO:1) or LSADSSGSYLYVF (SEQ ID NO:2) amino acid sequence. Also provided herein are methods of treating or preventing cast nephropathy in a subject. The methods comprise identifying a subject with or at risk of developing cast nephropathy and administering to the subject any of the polypeptides disclosed herein.
