Interleukin 5 regulation of peritoneal Ly-1 B lymphocyte proliferation, differentiation and autoantibody secretion.
The in vitro effects of recombinant interleukin (IL) 5 on proliferation and maturation of mouse Ly-1 B cells were studied. Most freshly isolated peritoneal Ly-1 B cells expressed high levels of IL5 receptor (R). Limiting dilution analyses showed that mitogens could reveal IL5 responsiveness in more than half of low density peritoneal Ly-1 B cells. IL 5 was able not only to increase the proportion of these Ly-1 B cells induced to proliferate, but it also shifted the clone size distribution of proliferating cells towards larger clone sizes. Splenic Ly-1 B cells also proliferated in response to mitogens plus IL5. Spontaneous and polyclonal activator-induced plaque-forming cell responses of Ly-1 B cells were increased by IL5. Furthermore, IL5 increased the frequency of peritoneal Ly-1 B cells induced to secrete certain autoantibodies. IL5 was certainly the agent responsible since its effects on both proliferation and differentiation were inhibited by either anti-IL5R monoclonal antibodies or by anti-IL5 monoclonal antibodies. Hence, Ly-1 B cells, IL5 and the IL5R appear to constitute a system of cellular proliferation, differentiation and some autoantibody production. Strategies specifically targeting the interleukin and receptor elements of this system might afford external control of these cellular responses.
Wetzel
G D
GD
Basel Institute for Immunology, Switzerland.
D000818:Animals; D000917:Antibody Formation; D000950:Antigens, Ly / Q000032:analysis; D001202:Ascitic Fluid / Q000166:cytology; D001323:Autoantibodies / Q000378:metabolism*; D001402:B-Lymphocytes / Q000166:cytology / Q000276:immunology*; D002454:Cell Differentiation; D002469:Cell Separation; D005434:Flow Cytometry; D015848:Interleukin-5 / Q000502:physiology*; D008213:Lymphocyte Activation; D051379:Mice; D008815:Mice, Inbred Strains; D013154:Spleen / Q000166:cytology
D000950:Antigens, Ly; D001323:Autoantibodies; D015848:Interleukin-5