The present invention relates to a non-naturally occurring peptide comprising amino acid sequence S-V-L-T-X1-E-N-X2(SEQ ID NO : 1), wherein X1 is any amino acid and X2 is any amino acid, which may optionally be linked to an amino acid sequence X3-I-X4-X5-E-X6 (SEQ ID NO : 5), wherein, X3, X4, X5 and X6 each denote any amino acid. The present invention further relates to the use of such peptides as a medicament such as for the prevention and treatment of kidney disease and in apheresis methods.