Compounds useful for the treatment and/or care of the skin, hair, nails and/or mucous membranes

A compound according to formula (I):

• R1-Wm-Xn-AA1-AA2-AA3-AA4-AA5-AA6-(AA7)a-(AA8)Yp-Zq-R2 (I),
• its stereoisomers and/or its cosmetically or pharmaceutically acceptable salts, wherein:
• AA1 is Glu;
• AA2 is Glu;
• AA3 is Met;
• AA4 is Gln;
• AA5 is Arg;
• AA6 is Arg;
• AA7 is selected from the group consisting of Ala, Ser, Gly, Thr, Pro, Glu, Lys and Val;
• AA8 is selected from the group consisting of Asp, Glu, Asn and Gln;
• and
• 0, 1 or 2 of AA1, AA2, AA3, AA4, AA5 and AA6 are replaced providing that:
• when AA1 is replaced, it is replaced by an amino acid selected from the group consisting of Asp, Gln and Asn;
• when AA2 is replaced, it is replaced by an amino acid selected from the group consisting of Asp and Gln;
• when AA3 is replaced, it is replaced by an amino acid selected from the group consisting of Leu and Ile;
• when AA4 is replaced, it is replaced by an amino acid selected from the group consisting of Glu, Asn and Asp;
• when AA5 is replaced, it is replaced by Lys;
• and
• when AA6 is replaced, it is replaced by an amino acid selected from the group consisting of Lys and His;
• a and b are each independently 0 or 1, with the proviso that when a is 0, b is 0;
• W, X, Y and Z are each independently an amino acid;
• m, n, p and q are each independently 0 or 1;
• m+n+p+q is less than or equal to 2;
• R1 is selected from the group consisting of H, a polymer derived from polyethylene glycol, a non-cyclic aliphatic group, alicyclyl, heterocyclyl, heteroarylalkyl, aryl, aralkyl and R5—CO—, wherein R5 is selected from the group consisting of H, a non-cyclic aliphatic group, alicyclyl, aryl, aralkyl, heterocyclyl and heteroarylalkyl;
• R2 is selected from the group consisting of —NR3R4, —OR3, —SR3, wherein R3 and R4 are independently selected from a group consisting of H, a polymer derived from polyethylene glycol, a non-cyclic aliphatic group, alicyclyl, heterocyclyl, heteroarylalkyl, aryl and aralkyl;
• and
• R1 and R2 are not amino acids.