Cell surface differentiation antigens of the malignant T cell in Sezary syndrome and mycosis fungoides
Abstract
Using a panel of monoclonal antibodies and rabbit heteroantisera, we have studied the cell surface markers of peripheral blood (PB) Sezary cells from six patients with mycosis fungoides or Sezary syndrome, disease grouped within the spectrum of cutaneous T cell lymphomas (CTCL). Furthermore, we have studied two cell lines (Hut 78 and Hut 102) derived from malignant Sezary T cells from CTCL patients. The monoclonal antibody 3A1 defines a major human PB T cell subset (85% of PB T cells) while the antigen defined by the monoclonal antibody 4F2 is present on a subset (70%) of activated PB T cells and on circulating PB monocytes. In contrast to normal subjects in whom 60-70% of circulating PB mononuclear cells were 3A1(+) T cells, PB mononuclear cells from six CTCL patients studied had an average of only 10.6+/-3.2% 3A1(+) T cells. Whereas 85% of E-rosette positive cells from normal individuals were 3A1(+), virtually all E-rosette positive T cells from the Sezary patients were 3A1(-). Two patients with high numbers of circulating Sezary T cells had both aneuploid and diploid PB T cell populations present; after separation of PB T cells into 3A1(+) and 3A1(-) cell suspensions, all 3A1(-) cells were found to be aneuploid. In contrast ...Continue Reading
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