A compound of general formula (I): R1-Wn-Xm-AA1-AA2-AA3-AA4-AA5-AA6-Yp-Zq-R2 (I) its stereoisomers, mixtures thereof, their cosmetically or pharmaceutically acceptable salts and / or its functionally equivalent variants, characterized in that: AA1 is selected from the group consisting of -Arg-, -Gln-, -Asn-, -Glu- and -Asp-； AA2 is -Asp-； AA3 is selected from the group consisting of Ile- and -Phe-； AA4 is selected from the group consisting of -Ala- and -Asp-； AA5 is selected from the group consisting of -Arg-, -Lys-, -Gln-, -Asn- and -Glu-； AA6 is selected from the group consisting of -Met-, -MetO-, -MetO2- and -Trp-； W, X, Y, Z are amino acids and are independently selected from each other； n, m, p and q are independently selected from each other and have a value of 0 or 1； n + m + p + q is less than or equal to 2； with the proviso that if AA1 is -Gln-, AA2 is -Asp-, AA3 is -Ile-, AA5 is -Arg- and AA6 is -Trp-, then AA4 is -Ala-； R1 is selected from the group consisting of H, a polymer derived from polyethylene glycol, a substituted or unsubstituted non-cyclic aliphatic group, substituted or unsubstituted alicyclyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted heteroaryl alkyl, substituted or unsubstituted aryl, aralkyl substituted or unsubstituted and R5-CO-, wherein R5 is selected from the group consisting of H, a 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； R2 is selected from the group consisting of -NR3R4, -OR3 and -SR3, in which R3 and R4 are independently selected from the group consisting of H, a polymer derived from polyethylene glycol, a substituted or unsubstituted non-cyclic aliphatic group, substituted alicyclyl or unsubstituted, substituted or unsubstituted heterocyclyl, substituted or unsubstituted heteroarylal
