Summary
Specificities of antibodies against human T-cell leukemia virus type I (HTLV-I) in sera of 27 patients with adult T-cell leukemia (ATL) were studied. All sera were positive for HTLV-I antigens by immunofluorescence assay using cells expressing HTLV-I antigens; sera from five ATL patients, however, did not react or hardly reacted with p19 or p24 gag proteins of HTLV-I upon immunoprecipitation assay. Therefore, the relationships among antibody specificities against HTLV-I, the proviral structures of HTLV-I genomes in leukemic cells, and the expression of viral antigens by leukemic cells after cultivation in vitro for a few days were examined. Analyses of the genomic structures of the proviruses revealed deletions in at least seven cases. However, we could not detect deletions in the proviral genomes of four out of the five ATL patients who lacked antibodies against gag proteins. Furthermore, expression of p19 and p24 was detected in these patients' peripheral blood lymphocytes (PBL) cultured in vitro for a few days. Thus, some ATL patients could not or could hardly raise antibodies against gag proteins, although they harbored complete HTLV-I genomes and their PBL expressed gag proteins in vitro. All patients harboring deleted proviruses, so far tested, raised antibodies not only against viral proteins that should be encoded by the integrated proviruses, but also against viral proteins that should be encoded by the deleted regions. Antibodies against viral proteins were detected also in sera of ATL patients whose PBL did not express viral proteins after in vitro cultivation. Specificities of antibodies against viral proteins in ATL patients could not be predicted by the structures of proviruses in leukemic cells or by expression of viral proteins in vitro. Immune responses to HTLV-I antigens were weak or lost in some ATL patients.
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Abbreviations
- HTLV-I:
-
human T-cell leukemia virus type I
- ATL:
-
adult T-cell leukemia
- PBL:
-
peripheral blood lymphocytes
- PAGE:
-
Polyacrylamide gel electrophoresis
- kb:
-
kilobases
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Supported in part by a grant-in-aid from the Ministry of Health and Welfare of Japan for a comprehensive 10-year strategy for cancer control, and a grant-in-aid from the Ministry of Education, Science and Culture of Japan
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Suetake, N., Takeuchi, Y., Shimizu, N. et al. Frequent lack of antibodies against human T-cell leukemia virus type I gag proteins p24 or p19 in sera of patients with adult T-cell leukemia. J Cancer Res Clin Oncol 115, 279–284 (1989). https://doi.org/10.1007/BF00391703
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DOI: https://doi.org/10.1007/BF00391703