Differential expression of the ufo/axl oncogene in human leukemia-lymphoma cell lines - PubMed (original) (raw)

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• PMID: 8656672

Comparative Study

Differential expression of the ufo/axl oncogene in human leukemia-lymphoma cell lines

C Challier et al. Leukemia. 1996 May.

Abstract

The ufo protein (also termed axl) is a member of a new family of receptor tyrosine kinases and is encoded by a transforming gene that was initially isolated from primary human myeloid leukemia cells by DNA-mediated transformation of NIH/3T3 cells. The ligand, Gas6, a protein S-related molecule lacking any known function yet, has recently been identified. We report the expression pattern of ufo mRNA in a panel of 76 human continuous leukemia-lymphoma cell lines. The gene was not expressed in cell lines derived from lymphoid malignancies (n=28), but transcription was seen in 3/11 myeloid, 0/6 monocytic, 9/13 erythroid and 11/18 megakaryocytic cell lines. Several cell lines were treated with phorbol ester leading to significant upregulation of the ufo message in constitutively positive cells. An apparent ufo mRNA overexpression was not found in any of the positive leukemia cell lines, but was identified in the drug-resistant subclones of the cervix carcinoma cell line HeLa. Southern blot analysis of restriction enzyme-digested genomic DNA did not provide evidence for gene amplification, but the HeLa subclones showed banding patterns suggestive of gene rearrangement. Two main ufo mRNA bands of 3.2 and 5.0 kb were identified; no differences in the half-lives (t1/2 = 2.5 h) of these two mRNA species could be identified. In summary, ufo, representing a novel type of receptor tyrosine kinase, is expressed solely in myeloid and erythro-megakaryocytic leukemias but not in lymphoid malignancies. These and previous data suggest an involvement of the ufo receptor tyrosine kinase in normal and malignant myelopoiesis; however, its exact role, if any, and mode of operation in leukemogenesis remains to be determined.

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