Gene family with transformation modulating activity

C - Chemistry – Metallurgy – 12 – N

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C12N 15/85 (2006.01) C07H 21/04 (2006.01) C07K 14/47 (2006.01) C07K 16/32 (2006.01) C12N 15/11 (2006.01) C12N 15/12 (2006.01) C12Q 1/68 (2006.01) G01N 33/574 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2311645

pp32 is a member of a highly conserved family of differentiation-regulated nuclear proteins that is highly expressed in nearly all human prostatic adenocarcinomas of Gleason Grade 5. This contrasts with the low percentage of prostate tumors that express molecular alterations in proto-oncogenes or demonstrate tumor suppressor mutation or loss of heterozygosity. By analysis of specimens of human prostatic adenocarcinoma and paired adjacent normal prostate from three individual patients, the inventors have shown that normal prostate continues to express normal pp32, whereas three of three sets of RT- PCR-amplified transcripts from prostatic adenocarcinomas display multiple cancer-associated coding sequence changes. The cancer-associated sequence changes appear to be functionally significant. Normal pp32 exerts antineoplastic effects through suppression of transformation. In contrast, cancer-associated pp32 variants augment, rather than inhibit, transformation.

La phosphoprotéine pp32 est un membre d'une famille hautement conservée de protéines nucléaires régulées par différentiation, qui est fortement exprimée dans presque tous les adénomes prostatiques humains ?5 sur l'échelle de Gleason. Ce résultat contraste avec le faible pourcentage de tumeurs de la prostate qui expriment des altérations moléculaires des proto-oncogènes, qui présentent une mutation du suppresseur des tumeurs ou une perte d'hétérozygosité. L'analyse d'échantillons prélevés sur des adénomes prostatiques humains et sur des tissus prostatiques normaux adjacents provenant de trois patients a permis aux inventeurs de démontrer que la prostate normale continue d'exprimer la phosphoprotéine pp32 normale, alors que trois ensembles sur trois de produits de transcription amplifiés par RT-PCR issus d'adénomes prostatiques présentent plusieurs modifications de séquences de codage associées au cancer. Les modifications de séquences associées au cancer s'avèrent fonctionnellement importantes. La phosphoprotéine pp32 normale exerce des effets antinéoplasiques par suppression de la transformation. Au contraire, les variants de pp32 associés au cancer accélèrent la transformation plus qu'ils ne l'inhibent.

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