The present invention relates to the use of at least one peptide, with the sequence (AA)n -Arg-Gly-Ser-(AA)n, where (AA) is any amino acid or one of its derivatives, and N is an integer between 0 and 3, as an active ingredient, in or for the preparation of a cosmetic and/or dermatological and/or pharmaceutical composition. The invention also relates to its use in order to treat, inter alia, the cutaneous manifestations of aging and/or its use in order to act against cellulite. The invention is, in the same way, related to a composition containing it as well as a process of cosmetic treatment of the skin using the said peptide or the said composition.