TY - JOUR
T1 - Detection of B-lymphocyte(B-cell)-associated antigens on human leukemic lymphocytes. Masking of membrane antigens
AU - Hsu, C. C S
AU - Morgan, E. R.
PY - 1978/1/1
Y1 - 1978/1/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0018069947&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0018069947&partnerID=8YFLogxK
U2 - 10.1093/ajcp/70.5.741
DO - 10.1093/ajcp/70.5.741
M3 - Article
C2 - 213964
AN - SCOPUS:0018069947
SN - 0002-9173
VL - 70
SP - 741
EP - 747
JO - American Journal of Clinical Pathology
JF - American Journal of Clinical Pathology
IS - 5
ER -