Vaccine for the reversible immunocastration of mammals

C - Chemistry – Metallurgy – 07 – K

Patent

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Details

C07K 7/23 (2006.01) A61K 38/09 (2006.01) A61K 39/00 (2006.01)

Patent

CA 2275440

The invention relates to the field of genetic engineering and biotechnology and particularly to the use of a peptide derived from GnRH for the immunocastration of mammals. Vaccinations tests have been carried out in mammals with the gonadotropine release hormone (GnRH), in order to ellicit and immune response which neutralizes the activity of said hormone. The present invention relates to the use of a GnRH variant of mammals wherein a glycin residue has been substituted by a prolin residue in position 6: Glu-His-Trp- Ser-Tyr-Pro-Leu-Arg-Pro-Gly. This substitution or change has induced an immune response which is superior than that of natural GnRH, when both are coupled to a same carrier protein, in experiments carried out in pigs. This same result can be expected in any other mammal since this hormone is present in all species.

La présente invention concerne le domaine du génie génétique et de la biotechnologie, et plus particulièrement, l'utilisation d'un peptide dérivé de la GnRH pour l'immuno-castration des mammifères. Chez le mammifère, on a réalisé des essais de vaccination par l'hormone de libération de la gonadotropine (GnRH) dans le but de provoquer une réponse immunitaire neutralisant l'activité de cette hormone. La présente invention a pour objet l'utilisation d'une variante de la GnRH de mammifères dans laquelle un résidu glycine est substitué par un résidu proline en position 6: Glu-His-Trp-Ser-Tyr-Pro-Leu-Arg-Pro-Gly. Cette substitution a permis d'induire une réponse immunitaire supérieure à celle de la GnRH naturelle lorsque ces deux résidus sont couplés à une même protéine support, dans les essais réalisés chez le porc. Il devrait être possible d'obtenir des résultats semblables chez tout autre mammifère car toutes les espèces possèdent cette hormone.

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