Regulation by interleukin 2 of CD23 expression of leukemic and normal B cells: comparison with interleukin 4.
Recombinant interleukin (IL) 4 has been shown to be able to up-regulate low-affinity Fc receptor for IgE (Fc epsilon RII)-CD23 expression on B cells as well as on other human mononuclear cells. We demonstrate here that, in opposition with previous reports, recombinant IL2 also can up-regulate CD23 expression on B cells. This was first observed on CLL cells which represent a monoclonal proliferation of B cells arrested at an intermediate stage of activation. Cells of 5 out of 12 B-CLL studied display such an increase and all 5 proliferated, in vitro, directly in response to IL2. Similarly, upon triggering with anti-mu and IL2, normal tonsillar B lymphocytes also demonstrate an increase of CD23 expression but this was observed only on day 3. Interferon-gamma was able to inhibit this IL2-mediated up-regulation of CD23 on normal B cells but not on CLL-B cells; on those cells interferon-gamma was similarly unable to inhibit the IL4-mediated CD23 up-regulation. These results suggest that CD23 regulation is complex and related to the stage of activation and the cell type.
Hivroz
C
C
Laboratory of Immunochemistry and Immunopathology, INSERM U.108, Hôpital Saint Louis, Paris, France.
Vallé
A
A
Brouet
J C
JC
Banchereau
J
J
Grillot-Courvalin
C
C
D000911:Antibodies, Monoclonal / Q000276:immunology; D000944:Antigens, Differentiation, B-Lymphocyte / Q000502:physiology*; D000951:Antigens, Neoplasm / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D004305:Dose-Response Relationship, Drug; D005434:Flow Cytometry; D006801:Humans; D066298:In Vitro Techniques; D007371:Interferon-gamma / Q000494:pharmacology; D007376:Interleukin-2 / Q000494:pharmacology*; D015847:Interleukin-4; D007378:Interleukins / Q000494:pharmacology*; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000276:immunology*; D008213:Lymphocyte Activation; D011961:Receptors, Fc / Q000502:physiology*; D017455:Receptors, IgE; D014407:Tumor Cells, Cultured
D000911:Antibodies, Monoclonal; D000944:Antigens, Differentiation, B-Lymphocyte; D000951:Antigens, Neoplasm; D007376:Interleukin-2; D007378:Interleukins; D011961:Receptors, Fc; D017455:Receptors, IgE; D015847:Interleukin-4; D007371:Interferon-gamma