Cosmetic or pharmaceutical peptides containing uncoded amino acids and their use in the treatment and/or care of the skin, mucous membranes, or scalp

A peptide of general formula (I)

• R1-Wp-Xn-AA1-AA2-AA3-AA4-Ym-R2 (I)
• its stereoisomers, mixtures thereof, and/or its cosmetically or pharmaceutically acceptable salts, wherein at least one of the amino acids AA1, AA2 and AA4 is uncoded, and in that:
• AA1 is selected from the group consisting of -Arg-, -Phg- and -Nle- or is a bond;
• AA2 is selected from the group consisting of -Ala-, -Phg-, -Cit- and -Nle-;
• AA3 is selected from the group consisting of -Trp-, -Val- and -Tyr-;
• AA4 is selected from the group consisting of -Phg- and -Gly-;
• W, X and Y are independently selected from the group consisting of coded or uncoded amino acids;
• p, n and m range between 0 and 1;
• R1 is selected from the group consisting of H, substituted or unsubstituted non-cyclic aliphatic group, substituted or unsubstituted alicyclyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted heteroarylalkyl, substituted or unsubstituted aryl, substituted or unsubstituted aralkyl and R5—CO;
• R2 is selected from the group consisting of —NR3R4, —OR3 and —SR3;
• wherein R3 and R4 are independently selected from the group consisting of H, substituted or unsubstituted non-cyclic aliphatic group, substituted or unsubstituted alicyclyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted heteroarylalkyl, substituted or unsubstituted aryl and substituted or unsubstituted aralkyl;
• wherein R5 is selected from the group consisting of H, substituted or unsubstituted non-cyclic aliphatic group, substituted or unsubstituted alicyclyl, substituted or unsubstituted aryl, substituted or unsubstituted aralkyl, substituted or unsubstituted heterocyclyl and substituted or unsubstituted heteroarylalkyl;
• and provided that when AA1 is a bond, AA2 is -Phg- and AA3 is -Tip-.