title: Interleukin-5 regulates genes involved in B-cell terminal maturation.
abstract: Interleukin (IL)-5 induces CD38-activated splenic B cells to differentiate into immunoglobulin M-secreting cells and undergo micro to gamma 1 class switch recombination (CSR) at the DNA level, resulting in immunoglobulin G1 (IgG1) production. Interestingly, IL-4, a well-known IgG1-inducing factor does not induce immunoglobulin production or micro to gamma 1 CSR in CD38-activated B cells. In the present study, we implemented complementary DNA microarrays to investigate the contribution of IL-5-induced gene expression in CD38-stimulated B cells to immunoglobulin-secreting cell differentiation and micro to gamma 1 CSR. IL-5 and IL-4 stimulation of CD38-activated B cells induced the expression of 418 and 289 genes, respectively, that consisted of several clusters. Surprisingly, IL-5-inducible 78 genes were redundantly regulated by IL-4. IL-5 and IL-4 also suppressed the gene expression of 319 and 325 genes, respectively, 97 of which were overlapped. Genes critically regulated by IL-5 include immunoglobulin-related genes such as J chain and immunoglobulinkappa, and genes involved in B-cell maturation such as BCL6, activation-induced cytidine deaminase (Aid) and B lymphocyte-induced maturation protein-1 (Blimp-1) and tend to be induced slowly after IL-5 stimulation. Intriguingly, among genes, the retroviral induction of Blimp-1 and Aid in CD38-activated B cells could induce IL-4-dependent maturation to Syndecan-1+ antibody-secreting cells and micro to gamma 1 CSR, respectively, in CD38-activated B cells. Taken together, preferential Aid and Blimp-1 expression plays a critical role in IL-5-induced immunoglobulin-secreting cell differentiation and micro to gamma 1 CSR in CD38-activated B cells.
authors.affiliation: Division of Immunology, Department of Microbiology and Immunology, the Institute of Medical Science, University of Tokyo, Tokyo, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Horikawa
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Takatsu
mesh_terms: D051997:ADP-ribosyl Cyclase 1 / Q000276:immunology; D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D002454:Cell Differentiation; D002478:Cells, Cultured; D003564:Cytidine Deaminase; D043525:Cytosine Deaminase / Q000235:genetics / Q000276:immunology; D003627:Data Interpretation, Statistical; D005434:Flow Cytometry; D005786:Gene Expression Regulation; D017578:Immunoglobulin Class Switching; D007074:Immunoglobulin G / Q000276:immunology; D007075:Immunoglobulin M / Q000276:immunology; D015847:Interleukin-4 / Q000502:physiology; D015848:Interleukin-5 / Q000502:physiology*; D051379:Mice; D008810:Mice, Inbred C57BL; D005810:Multigene Family; D020411:Oligonucleotide Array Sequence Analysis; D000074462:Positive Regulatory Domain I-Binding Factor 1; D012097:Repressor Proteins / Q000235:genetics / Q000276:immunology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014157:Transcription Factors / Q000235:genetics / Q000276:immunology; D000098830:AICDA (Activation-Induced Cytidine Deaminase)
chemical_list: D007074:Immunoglobulin G; D007075:Immunoglobulin M; D015848:Interleukin-5; C513258:Prdm1 protein, mouse; D012097:Repressor Proteins; D014157:Transcription Factors; D015847:Interleukin-4; D000074462:Positive Regulatory Domain I-Binding Factor 1; D051997:ADP-ribosyl Cyclase 1; D000098830:AICDA (Activation-Induced Cytidine Deaminase); D043525:Cytosine Deaminase; D003564:Cytidine Deaminase