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Adult T-cell Leukemia-derived Factor/thioredoxin, Produced by Both Human T-lymphotropic Virus Type I- and Epstein-Barr Virus-transformed Lymphocytes, Acts As an Autocrine Growth Factor and Synergizes with Interleukin 1 and Interleukin 2

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Specialty Science
Date 1990 Nov 1
PMID 2172979
Citations 54
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Abstract

Interleukin 1 (IL-1) has been obtained from the Epstein-Barr virus-infected B-lymphoblastoid cell line 3B6 and shown to be involved in autocrine growth of 3B6 B cells. Independently, adult T-cell leukemia-derived factor (ADF) was purified from human T-lymphotropic virus I-infected leukemic T-cell line (ATL-2) and reported as an interleukin 2 (IL-2) receptor-inducing factor. We have previously reported the same molecular mass, pI, and NH2-terminal amino acid sequence for both 3B6-derived IL-1 and ADF. cDNA cloning of ADF demonstrated high homology with the prokaryotic disulfide reducing enzyme thioredoxin. We show here that ADF and 3B6-derived IL-1 are identical. By RNA blot, 3B6 and ATL-2 cells were shown to contain high levels of 0.6-kilobase mRNA corresponding to ADF. Such message was not detected in resting peripheral blood lymphocytes but could be weakly induced by lymphocyte activation. Antibodies have been raised against synthetic peptides corresponding to the NH2 terminus and the COOH terminus of ADF. Immunoblotting and sequential immunoprecipitation with these antibodies revealed the same 13-kDa protein in 3B6 and ATL-2 cells. Recombinant ADF could sustain growth of 3B6 and ATL-2 cells at low cellular concentration without fetal calf serum; ADF, thus, appears involved in their autocrine growth. Similarly, recombinant ADF could enhance growth of other B-cell lines, including the Epstein-Barr virus-negative Burkitt lymphoma line BL41 and the lymphoblastoid cell lines CRAG8, CRB95, and 1G8. Finally, recombinant ADF exhibits marked synergism with other cytokines, such as IL-1 and IL-2, allowing virally infected lymphocytes to respond to suboptimal amounts of a variety of growth factors.

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