Establishment of a novel human B-cell line (OZ) with t(14;18)(q32;q21) and aberrant p53 expression was associated with the homozygous deletions of p15INK4B and p16INK4A genes.

Abstract:

:The novel human pre-B cell line OZ was established from a patient with an aggressive form of non-Hodgkin's lymphoma. Karyotypic analysis of both the primary tumour and OZ cells revealed several marker chromosomes, including the t(14;18)(q32;q21) translocation, which involves the Bcl-2 gene, and alterations on chromosome 17p. Southern blot analysis found identical rearrangements in the 5' region of Bcl-2 gene in the primary tumour and OZ cells. Homozygous deletions of the p15INK4B and p16INK4A genes, however, were present only in OZ cells. Western blot analysis detected aberrant small molecular-weight p53 proteins in both cell types. In addition, OZ cells no longer expressed the CD20 antigen. These findings suggest that Bcl-2 gene rearrangement and aberrant p53 expression resulted in the original B-cell tumour. A subsequent transforming event involving the p15INK4B and p16INK4A genes may have generated more immature cells with a growth advantage during in vitro culture. The genetic alterations involving p53, p15INK4B, and p16INK4A may be implicated in the aggressive form of t(14;18)(q32;q21)-bearing tumours and their poor prognosis.

journal_name

Hematol Oncol

journal_title

Hematological oncology

authors

Nagai M,Fujita M,Ohmori M,Matsubara S,Taniwaki M,Horiike S,Tasaka T,Koeffler HP,Takahara J

doi

10.1002/(sici)1099-1069(199708)15:3<109::aid-hon60

subject

Has Abstract

pub_date

1997-08-01 00:00:00

pages

109-19

issue

3

eissn

0278-0232

issn

1099-1069

pii

10.1002/(SICI)1099-1069(199708)15:3<109::AID-HON60

journal_volume

15

pub_type

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