Detection of B-lymphocyte(B-cell)-associated antigens on human leukemic lymphocytes. Masking of membrane antigens

C. C S Hsu, E. R. Morgan

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8 Scopus citations


An indirect immunofluorescence technic has been used for rabbit antisera (anti-EP) that demonstrated complement-dependent cytotoxicity against human leukemic lymphocytes but not against normal blood lymphocytes. With the immunofluorescent technic, the antisera were found to react with 2-23% of normal blood lymphocytes. Simultaneous staining of normal cells with anti-EP and for surface immunoglobulins (SIg) on bone-marrow-derived B-cells showed that the proportions of stained cells were similar to percentages of cells stained by anti-EP alone or for SIg alone. The percentage of anti-EP reactive cells also approximated the percentage of cells reactive to a known antiserum to human B-cell associated, or Ia-like, antigens. The anti-EP reacted with lymphoblastoid cells from two B-cell lines lacking the Epstein-Barr viral genome. The antigens detected by anti-EP probably are B-cell-associated. The anti-EP intensely stained neoplastic cells of acute or chronic lymphocytic leukemia and lymphosarcoma-cell leukemia. Cells from two patients with chronic lymphocytic leukemia and from two patients with acute lymphocytic leukemia showed increased intensity of anti-EP staining and/or increased proportions of stained cells following overnight incubation in culture medium, compared with the preincubation samples. This observation suggests the presence of a 'blocking component(s)' on cell surfaces, which interfered with anti-EP reactivity. After overnight incubation, the component might have been removed from the antigenic sites on cell surfaces. Further studies of leukemic lymphocytes using anti-EP for the cell-bound 'blocking component' may reveal important pathogenetic mechanisms.

Original languageEnglish (US)
Pages (from-to)741-747
Number of pages7
JournalAmerican Journal of Clinical Pathology
Issue number5
StatePublished - Jan 1 1978

ASJC Scopus subject areas

  • Pathology and Forensic Medicine


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