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1.
Chinese Journal of Hematology ; (12): 239-242, 2002.
Article Dans Chinois | WPRIM | ID: wpr-261441

Résumé

<p><b>OBJECTIVE</b>To investigate the relationship between p73 gene and the development and progression of childhood acute lymphoblastic leukemia (ALL).</p><p><b>METHODS</b>The levels of p73 transcripts in 61 ALL cell lines and 53 childhood ALL patients were assayed using reverse transcriptase-polymerase chain reaction (RT-PCR), and their relationship with the clinicopathological characteristics was analyzed. Besides, the methylation status of p73 exon 1 was analysed by restriction-enzyme related PCR, methylation-specific PCR and bisulfite genomic sequencing in the 61 ALL cell lines.</p><p><b>RESULTS</b>Of the 61 ALL cell lines, 42 showed expression of p73 mRNA, with a negative rate of 31.1%, and of the 53 primary childhood ALL samples, 39 showed expression of p73 mRNA, with a negative rate of 26.4%. Loss of p73 expression was significantly associated with the reduced disease free survival and overall survival of the patients. 39.3% (24/61) of the ALL cell lines showed hypermethylation of p73 exon 1, while normal lymphocytes and most cell lines expressed p73 mRNA were not hypermethylated.</p><p><b>CONCLUSION</b>There was a higher negative expression rate of p73 mRNA in childhood ALL. The main mechanism of the loss expression would be the hypermethylation of p73 gene. p73 gene inactivation might play an important role in the pathogenesis of ALL. Examination of p73 mRNA might have clinical significance in predicting prognosis of childhood ALL.</p>


Sujets)
Adolescent , Enfant , Enfant d'âge préscolaire , Femelle , Humains , Nourrisson , Mâle , Lignée cellulaire , Classification , Biologie cellulaire , Métabolisme , Méthylation de l'ADN , Protéines de liaison à l'ADN , Génétique , Métabolisme , Survie sans rechute , Extinction de l'expression des gènes , Gènes suppresseurs de tumeur , Protéines nucléaires , Génétique , Métabolisme , Leucémie-lymphome lymphoblastique à précurseurs B et T , Génétique , Métabolisme , Mortalité , ARN messager , Taux de survie , Protéine tumorale p73 , Protéines suppresseurs de tumeurs
2.
Korean Journal of Pediatric Hematology-Oncology ; : 199-205, 1999.
Article Dans Anglais | WPRIM | ID: wpr-169303
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