A novel form of dipeptidylpeptidase iv (cd26) found in human...

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 9/48 (2006.01) A61K 38/00 (2006.01) A61K 38/48 (2006.01) A61K 39/00 (2006.01) A61K 39/395 (2006.01) A61P 37/04 (2006.01) C07K 14/00 (2006.01) C07K 16/18 (2006.01) C07K 16/40 (2006.01) C12N 15/09 (2006.01) C12P 21/08 (2006.01) C12Q 1/37 (2006.01) G01N 33/53 (2006.01) G01N 33/573 (2006.01)

Patent

CA 2222419

A circulating, soluble form of DPPIV/CD26 isolated from human serum is disclosed. The serum form shares similar enzymatic and antigenic properties with the ubiquitous membrane form. However, in several biochemical aspects there are distinct differences. In particular, the circulating serum form has a molecular weight of 175 kDa (in contrast to the 105 kDa molecular weight of the membrane form), and it does not bind Adenosine Deaminase Type-1. Nevertheless, the circulating form expresses functional dipeptidylpeptidase IV activity and retains the ability to costimulate the T lymphocyte response to recall antigen. Circulating DPPIV has been determined to be the soluble form of a 175 kDa DPPIVCD26-related molecule rapidly expressed on the surface of activated T cells, prior to the expression of 105 kDa CD26. Although 105 kDa membrane type CD26 may be found in the serum in small amounts, the majority of serum DPPIV activity is provided by a novel peptidase structurally distinct from 105 kDa CD26/DPPIV. Polyclonal and monoclonal antibodies capable of distinguishing the 175 kDa form from the 105 kDa form are also disclosed.

L'invention décrit une forme circulante soluble de DPPIV/CD26 isolée à partir de sérum humain. La forme sérique a en commun avec la forme membranaire ubiquiste des propriétés enzymatiques et antigéniques similaires. Toutefois, des différences distinctes existent dans plusieurs aspects biochimiques. Notamment, la forme sérique circulante a un poids moléculaire de 175 kDa (par rapport au poids moléculaire de 105 kDa de la forme membranaire) et ne se fixe pas à l'adénosine désaminase de type 1. Néanmoins, la forme circulante exprime l'activité fonctionnelle de la dipeptidylpeptidase IV et conserve l'aptitude à co-stimuler la réponse des lymphocytes T aux antigènes de rappel. Il a été déterminé que la DPPIV circulante était la forme soluble d'une molécule liée à la DPPIVCD26 de 175 kDa rapidement exprimée à la surface de lymphocytes T activés, avant l'expression du CD26 de 105 kDa. Bien que l'on puisse trouver en petites quantités dans le sérum un type membranaire de CD26 de 105 kDa, la majorité de l'activité de la DPPIV sérique est fournie par une peptidase de type nouveau structurellement distincte de la CD26/DPPIV de 105 kDa. L'invention décrit également des anticorps polyclonaux et monoclonaux capables de distinguer la forme à 175 kDa de la forme à 105 kDa.

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