Human gut mycobiota tune immunity via CARD9-dependent induction of anti-fungal IgG antibodies.

Human gut mycobiota tune immunity via CARD9-dependent induction of anti-fungal IgG antibodies.
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人类肠道真菌生物群通过CARD9依赖性诱导抗真菌IgG抗体来调节免疫力。

DOI:
10.1016/j.cell.2021.01.016
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发表时间:
2021-02-18
期刊:
影响因子:
64.5
通讯作者:
Iliev ID
Iliev ID
中科院分区:
生物学1区
文献类型:
--
作者:
Doron I;Leonardi I;Li XV;Fiers WD;Semon A;Bialt-DeCelie M;Migaud M;Gao IH;Lin WY;Kusakabe T;Puel A;Iliev ID

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抗体介导针对病毒和细菌病原体的自然免疫和疫苗诱导的免疫,而真菌代表了广泛的病原物种王国,临床上既没有疫苗也没有中和抗体疗法。在这里,我们使用多界抗体分析 (multiKAP) 方法,探索针对肠道共生真菌(真菌生物群)的人类抗体库。我们确定了人类全身抗体优先靶向的物种,其中白色念珠菌是抗真菌免疫球蛋白 G (IgG) 的主要诱导剂。肠道的真菌定植会诱导肠外淋巴组织中生发中心 (GC) 依赖性 B 细胞扩增,并产生全身抗体,从而提供针对播散性白色念珠菌或耳念珠菌感染的保护。抗真菌 IgG 的产生取决于先天免疫调节因子 CARD9 和 CARD9+CX3CR1+ 巨噬细胞。在患有侵袭性念珠菌病的个体中,CARD9 的功能丧失突变与抗真菌 IgG 反应受损有关。这些结果揭示了肠道共生真菌通过 CARD9 依赖性诱导宿主保护性抗真菌 IgG 在塑造人类抗体库中发挥着重要作用。多伦等人。有证据表明,人类肠道中的共生真菌会在血液中形成抗体反应,以保护宿主免受系统性致命真菌感染。先天免疫调节因子 CARD9 和 CARD9+CX3CR1+ 巨噬细胞在抗真菌 IgG 的产生中发挥重要作用,而 CARD9 缺陷患者的 IgG 产生会减少。
Antibodies mediate natural and vaccine-induced immunity against viral and bacterial pathogens, whereas fungi represent a widespread kingdom of pathogenic species for which neither vaccine nor neutralizing antibody therapies are clinically available. Here, using a multi-kingdom antibody profiling (multiKAP) approach, we explore the human antibody repertoires against gut commensal fungi (mycobiota). We identify species preferentially targeted by systemic antibodies in humans, with Candida albicans being the major inducer of antifungal immunoglobulin G (IgG). Fungal colonization of the gut induces germinal center (GC)-dependent B cell expansion in extraintestinal lymphoid tissues and generates systemic antibodies that confer protection against disseminated C. albicans or C. auris infection. Antifungal IgG production depends on the innate immunity regulator CARD9 and CARD9+CX3CR1+ macrophages. In individuals with invasive candidiasis, loss-of-function mutations in CARD9 are associated with impaired antifungal IgG responses. These results reveal an important role of gut commensal fungi in shaping the human antibody repertoire through CARD9-dependent induction of host-protective antifungal IgG. Doron et al. present evidence that commensal fungi in the human gut shape antibody responses in the blood to protect the host from systemic lethal fungal infections. The innate immunity regulator CARD9 and CARD9+CX3CR1+ macrophages play an important role in antifungal IgG production, which is decreased in CARD9-deficient patients.
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