Tolerogenic fragments of natural allergens

A - Human Necessities – 61 – K

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Details

A61K 39/35 (2006.01) A61K 39/36 (2006.01)

Patent

CA 2307655

The present invention relates to a process for the controlled enzymatic cleavage of purified and depigmented active allergenic proteins from indoor and outdoor source materials, which process produces fragments of allergens that retain the natural T-lymphocyte stimulating epitopes, but are depleted of IgE-binding B-cell epitopes and complement activating agents. The invention also relates to the new pharmaceutical products. These allergen fragments do not exhibit the disadvantages of conventional allergenic extracts for immunotherapy and can be safely used to induce a state of specific T-cell anergy and immunological tolerance in allergic human beings.

La présente invention concerne un procédé de clivage enzymatique contrôlé de protéines allergènes actives purifiées et dépigmentées à partir de matériaux sources intérieurs et extérieurs. Ce procédé permet de produire des fragments d'allergène qui retiennent les épitopes naturels stimulant les lymphocytes T mais qui sont appauvris en épitopes de cellules béta fixant l'IgE et à agents d'activation de complément. Cette invention concerne également de nouveaux produits pharmaceutiques. Ces fragments d'allergènes ne présentent pas les inconvénients connus avec les extraits allergènes classiques destinés à l'immunothérapie et peuvent être utilisés en toute sécurité pour induire un état d'allergie spécifique des lymphocytes T, ainsi qu'une tolérance immunologique chez les êtres humains allergiques.

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