Peptide fragments of microbial stress proteins and...

A - Human Necessities – 61 – K

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A61K 39/04 (2006.01) A61K 31/7088 (2006.01) A61K 38/08 (2006.01) A61K 38/10 (2006.01) A61K 38/16 (2006.01) A61P 29/00 (2006.01) C12N 9/02 (2006.01) G01N 33/53 (2006.01) A61K 38/00 (2006.01) A61K 39/00 (2006.01) C07K 14/35 (2006.01)

Patent

CA 2185826

Peptides are provided which are useful for protection against or treatment of an inflammatory disease, including autoimmune diseases, such as diabetes, arthritic diseases, atherosclerosis, multiple sclerosis, myasthenia gravis or inflammatory responses due to tumour or transplant rejection. The peptides contain a part of the aminoacid sequence of a microbial protein having a conserved mammalian stress protein homologue, wherein the overall aminoacid sequence identity between the microbial and the mammalian homologues is at least 25 %, and the sequence identity between the microbial and the mammalian homologues of an area of at least 75 consecutive aminoacids is at least 30 %, said part comprising at least 5 aminoacids which are in the same relative position as the same aminoacids in a T cell epitope of said stress protein, which epitope contains at least 4 consecutive aminoacids which are identical with the corresponding mammalian stress protein aminoacids. Nucleotide sequences, expression systems, antibodies and pharmaceutical and diagnostic compositions derived from these peptides are provided as well.

Peptides assurant la protection contre une maladie inflammatoire, ou le traitement de celle-ci, ladite maladie étant par exemple l'une des maladies auto-immunes telles que le diabète, les maladies arthritiques, l'athérosclérose, la sclérose en plaques, la myasthénie grave, ou les réponses inflammatoires dues à une tumeur ou à un rejet de greffon. Les peptides contiennent une partie de la séquence d'acides aminés d'une protéine microbienne possédant un homologue conservé de protéine de stress mammalien, l'homologie globale entre les séquences d'acides aminés des homologues microbien et mammalien étant d'au moins 25 %, et l'homologie entre les séquences des homologues microbien et mammalien dans une plage d'au moins 75 acides aminés consécutifs étant d'au moins 30 %. Ladite partie comporte au moins 5 acides aminés qui se trouvent dans la même position relative que les mêmes acides aminés présents dans un épitope de lymphocyte T de ladite protéine de stress, cet épitope renfermant au moins 4 acides aminés consécutifs identiques aux acides aminés correspondants de la protéine de stress mammalienne. On a également prévu des séquences nucléotidiques, des systèmes d'expression, des anticorps et des compositions pharmaceutiques et diagnostiques dérivés de ces peptides.

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