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Specific NEMO Mutations Impair CD40-Mediated C-Rel Activation and B Cell Terminal Differentiation

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Specific NEMO Mutations Impair CD40-Mediated C-Rel Activation and B Cell Terminal Differentiation Specific NEMO mutations impair CD40-mediated c-Rel activation and B cell terminal differentiation Ashish Jain, … , Steven Holland, Jonathan M.J. Derry J Clin Invest. 2004;114(11):1593-1602. https://doi.org/10.1172/JCI21345. Article Immunology Hypomorphic mutations in the zinc finger domain of NF-κB essential modulator (NEMO) cause X-linked hyper-IgM syndrome with ectodermal dysplasia (XHM-ED). Here we report that patient B cells are characterized by an absence of Ig somatic hypermutation (SHM) and defective class switch recombination (CSR) despite normal induction of activation- induced cytidine deaminase (AID) and Iε-Cε transcripts. This indicates that AID expression alone is insufficient to support neutralizing antibody responses. Furthermore, we show that patient B cells stimulated with CD40 ligand are impaired in both p65 and c-Rel activation, and whereas addition of IL-4 can enhance p65 activity, c-Rel activity remains deficient. This suggests that these NF-κB components have different activation requirements and that IL-4 can augment some but not all NEMO-dependent NF-κB signaling. Finally, using microarray analysis of patient B cells we identified downstream effects of impaired NF-κB activation and candidate factors that may be necessary for CSR and SHM in B cells. Find the latest version: https://jci.me/21345/pdf Research article Specific NEMO mutations impair CD40-mediated c-Rel activation and B cell terminal differentiation Ashish Jain,1 Chi A. Ma,1 Eduardo Lopez-Granados,1 Gary Means,2 William Brady,2 Jordan S. Orange,3 Shuying Liu,1 Steven Holland,1 and Jonathan M.J. Derry2 1Laboratory of Host Defense, National Institute of Allergy and Infectious Diseases (NIAID), NIH, Bethesda, Maryland, USA. 2Amgen Inc., Seattle, Washington, USA. 3Division of Immunology, Children’s Hospital Boston, Boston, Massachusetts, USA. Hypomorphic mutations in the zinc finger domain of NF-κB essential modulator (NEMO) cause X-linked hyper-IgM syndrome with ectodermal dysplasia (XHM-ED). Here we report that patient B cells are character- ized by an absence of Ig somatic hypermutation (SHM) and defective class switch recombination (CSR) despite normal induction of activation-induced cytidine deaminase (AID) and Iε-Cε transcripts. This indicates that AID expression alone is insufficient to support neutralizing antibody responses. Furthermore, we show that patient B cells stimulated with CD40 ligand are impaired in both p65 and c-Rel activation, and whereas addi- tion of IL-4 can enhance p65 activity, c-Rel activity remains deficient. This suggests that these NF-κB compo- nents have different activation requirements and that IL-4 can augment some but not all NEMO-dependent NF-κB signaling. Finally, using microarray analysis of patient B cells we identified downstream effects of impaired NF-κB activation and candidate factors that may be necessary for CSR and SHM in B cells. Introduction target genes. As a result of its central position in NF-κB signal- Higher vertebrates rely on the diversity of the antibody repertoire ing, large genomic rearrangements in NEMO cause incontinentia to combat infectious pathogens. The cognate interaction between pigmenti, a lethal disease in males that causes abnormalities of CD40 ligand (CD40L) expressed on activated CD4+ T cells and the skin, hair, nails, teeth, and CNS in carrier females. In contrast, CD40 expressed on B cells leads to B cell proliferation and Ig hypomorphic mutations in NEMO cause anhidrotic ectodermal class switch recombination (CSR) from IgM toward the produc- dysplasia with immunodeficiency in affected males, a clinical con- tion of IgG, IgA, and IgE (1). Humans and mice with mutations dition characterized by the absence of sweat glands, a paucity of in the genes encoding CD40L or CD40 have skewed IgM antibody hair follicles, and heterogeneous immunodeficiency states (6–8). responses and a markedly diminished or absent IgG response to We have shown previously that patients with missense muta- protein antigens. Whereas the role of CD40L/CD40 interaction is tions in the zinc finger domain of NEMO have X-linked hyper- established, the molecular mechanisms associated with Ig CSR and IgM syndrome with ectodermal dysplasia (XHM-ED) (6). B somatic hypermutation (SHM) have not been precisely delineated. cells from these patients are of the naive phenotype, invariably Activation-induced cytidine deaminase (AID) is a putative coexpress surface IgM and IgD, and fail to undergo Ig CSR in RNA or DNA editing enzyme that is specifically expressed in B vitro when stimulated with CD40 agonists in vitro. Interestingly, cells in response to combined CD40L and IL-4 signaling. B cells NF-κB activation by other members of the TNF or the toll-like from humans and mice lacking AID develop normally but fail to receptor superfamily are relatively preserved in XHM-ED, sug- undergo CSR or SHM in response to antigen challenge (2, 3). AID gesting that mutations in the zinc finger domain primarily impair overexpression in non–B cells can induce somatic mutation and CD40 signaling in hematopoietic cells (6). CSR in plasmid DNA substrates, suggesting that AID functions In this report, we show that the Ig variable region in B cells from alone, or that factors necessary for its function are ubiquitously XHM-ED patients is devoid of SHM. Furthermore, B cells fail to expressed (4). However, the means by which AID regulates B cell activate c-Rel in response to CD40 stimulation, even in the pres- terminal differentiation remains undefined. ence of IL-4 (which partly restores p65 activation). Importantly, in NF-κB essential modulator (NEMO, also known as IKKγ) is a vitro activation of XHM-ED B cells with soluble CD40L and IL-4 scaffolding protein that binds to 2 proteins with intrinsic kinase induced normal levels of Iε-Cε germline transcripts and expression activity, IKKα and IKKβ (5). Upon cell stimulation, IKKα and of the AID gene. This suggests that the expression of additional IKKβ become activated, leading to the phosphorylation and sub- genes, perhaps regulated by CD40-mediated c-Rel activation, are sequent degradation of the inhibitors of NF-κB (IκBs). This frees necessary for Ig CSR. To identify such genes, we used oligonucle- NF-κB to translocate to the nucleus and activate transcription of otide microarrays to show that B cells in XHM-ED have specific impairments in the expression of RAD50, LYL1, DNA ligase IV Nonstandard abbreviations used: AID, activation-induced cytidine deaminase; (LIG4), and other factors relating to nonhomologous recombina- CD40L, CD40 ligand; CSR, class switch recombination; IκB, inhibitor of NF-κB; tion that previously have not been linked to B cell differentiation. LIG4, DNA ligase IV; NEMO, NF-κB essential modulator; SHM, somatic hypermuta- tion; XHM-ED, X-linked hyper-IgM syndrome with ectodermal dysplasia. Conflict of interest: The authors have declared that no conflict of interest exists. Results Citation for this article: J. Clin. Invest. 114:1593–1602 (2004). XHM-ED patients show defects in CSR and SHM. Three unrelated doi:10.1172/JCI200421345. male patients (designated XHM-ED1, XHM-ED2, and XHM- The Journal of Clinical Investigation http://www.jci.org Volume 114 Number 11 December 2004 1593 research article Table 1 Patient B cell characteristics Patient Age (yr) NEMO Naive Memory IgE production Mutations AID (relative Iε-Cε (relative mutation B cells (%) B cells (%) (ng/ml) (% per bp) Unmutated clones expression) expression) XHM-ED1 16 C417R 100 0 <5 0.14 7/9 35 ± 7 53 ± 9 XHM-ED2 17 C417R 99 <1 <5 0.19 10/14 31 ± 3 42 ± 7 XHM-ED3 2 C417Y 99–100 <1 <5 0.09 8/10 25 ± 4 37 ± 6 Normal 18–42 — 67–94 5–28 7.3–81.9 1.6–3.0 26/69 29 ± 12 40 ± 17 Five adult controls were used to determine the normal range for naive (IgM+IgD+) or memory (IgD–CD27+) B cells. In vitro Ig production was induced by stimulation of PBMCs with CD40L + IL-4 (10 ng/ml) for 8 days. Supernatants were assessed for Ig production by ELISA. IgE levels in unstimulated B cells + were less than 5.0 ng/ml. The frequency of mutation in the V3-23-Cμ transcript sequences was obtained from purified CD19 B cells and is expressed as mutations per bp. Unmutated, ≤ 1 mutation. AID and Iε-Cε mRNA levels were monitored by real-time PCR. CD19+ B cells were isolated from patients and from a normal control and stimulated with CD40 + IL-4 for 5 days. Absolute AID and Iε-Cε mRNA were determined and reported relative to 18S ribosomal RNA; 1 representative experiment of 3 is shown. ED3) were diagnosed with XHM-ED, defined by markedly dimin- rable to that obtained by amplification with Taq polymerase alone ished serum levels of IgG and IgE and normal or elevated levels (0.1% per bp). These results demonstrate that the hypermutation of serum IgM (Tables 1 and 2). Two of these patients have been process is impaired in XHM-ED patients and imply that while AID previously described (6, 9). Mutation analysis revealed that the and germline transcripts are necessary for mutational targeting, 3 patients had missense mutations in the zinc finger domain of additional factors regulated by NF-κB are also necessary. NEMO affecting cysteine at position 417. All patients presented CD40-mediated NF-κB activation in XHM-ED. In initial studies, in childhood with upper respiratory or severe bacterial infec- we more precisely defined the effect of the C417R mutation on tions. From the time of diagnosis, all patients were treated with NF-κB activation in B cells. In particular, we measured p65 and intravenous γ-globulin replacement therapy. c-Rel activation by electrophoretic mobility shift assay in cellular Germline homozygous mutations in the AID gene cause an lysates prepared from B cells from normal controls and 2 unre- autosomal recessive form of hyper-IgM syndrome (2).
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