自身免疫性溶血性贫血的潜在机制:发病机制网络、治疗进展与待解决问题

Beneath the surface in autoimmune hemolytic anemia: pathogenetic networks, therapeutic advancements and open questions.

作者信息

Costa Alessandro, Mulas Olga, Mereu Angela Maria, Schintu Mercede, Greco Marianna, Caocci Giovanni

机构信息

Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy.

Hematology Unit, Businco Hospital, ARNAS Brotzu, Cagliari, Italy.

出版信息

Front Immunol. 2025 Jul 31;16:1624667. doi: 10.3389/fimmu.2025.1624667. eCollection 2025.

Abstract

In recent years, the pathophysiologic framework of autoimmune hemolytic anemias (AIHAs) has evolved considerably, extending beyond the simplistic paradigm of antibody-mediated red blood cell (RBC) destruction, which is now recognized as a downstream consequence of a broader immune dysregulation. AIHA is fundamentally orchestrated by a complex interplay between innate and adaptive immune components, including autoreactive B and T lymphocytes, macrophages, and the reticuloendothelial system. Central to disease pathogenesis are two interrelated mechanisms: clonal B-cell expansion with autoantibody production and complement activation. These immunologic processes support the heterogeneity of AIHA, delineating distinct clinical entities such as warm AIHA, cold agglutinin disease/syndrome (CAD/CAS), and atypical variants, each characterized by specific therapeutic susceptibilities. Glucocorticoids remain the standard first-line therapy for warm AIHA; in contrast, CAD/CAS is increasingly managed with agents targeting B-cell function or complement activation, including rituximab and sutimlimab. However, therapeutic algorithms are rapidly shifting, particularly in the context of treatment-refractory disease. Emerging therapeutics targeting the classical complement pathway include novel anti-C1s monoclonal antibodies such as riliprubart, which exhibits an extended half-life due to enhanced affinity for the neonatal Fc receptor. Parallel strategies aim to disrupt B-cell receptor (BCR) signaling cascades, employing Bruton tyrosine kinase (BTK) inhibitors such as ibrutinib, spleen tyrosine kinase (SYK) inhibitors such as fostamatinib and sovleplenib, and phosphoinositide 3-kinase (PI3K) inhibitors such as parsaclisib. Collectively, these advances are reshaping the therapeutic landscape of AIHA toward a precision medicine model guided by mechanistic insights into disease biology. In this review, we delineate the evolving immunopathogenesis of AIHAs and examine emerging therapeutic strategies, integrating their underlying rationale, clinical data, and implications for future treatment paradigms.

摘要

近年来,自身免疫性溶血性贫血(AIHA)的病理生理框架有了很大发展,不再局限于抗体介导的红细胞(RBC)破坏这种简单模式,现在人们认识到这是更广泛免疫失调的下游后果。AIHA本质上是由先天性和适应性免疫成分之间复杂的相互作用所调控,包括自身反应性B和T淋巴细胞、巨噬细胞以及网状内皮系统。疾病发病机制的核心是两个相互关联的机制:产生自身抗体的克隆性B细胞扩增和补体激活。这些免疫过程支持了AIHA的异质性,划分出不同的临床实体,如温抗体型自身免疫性溶血性贫血、冷凝集素病/综合征(CAD/CAS)和非典型变体,每种都有特定的治疗敏感性特征。糖皮质激素仍然是温抗体型自身免疫性溶血性贫血的标准一线治疗药物;相比之下,CAD/CAS越来越多地采用针对B细胞功能或补体激活的药物进行治疗,包括利妥昔单抗和苏替利单抗。然而,治疗方案正在迅速转变,特别是在治疗难治性疾病的背景下。针对经典补体途径的新兴疗法包括新型抗C1s单克隆抗体,如riliprubart,由于对新生儿Fc受体的亲和力增强,其半衰期延长。并行策略旨在破坏B细胞受体(BCR)信号级联,采用布鲁顿酪氨酸激酶(BTK)抑制剂,如伊布替尼,脾酪氨酸激酶(SYK)抑制剂,如福斯替尼和索夫普利尼,以及磷酸肌醇3激酶(PI3K)抑制剂,如帕萨克利西布。总体而言,这些进展正在将AIHA的治疗格局重塑为一种精准医学模式,该模式由对疾病生物学的机制性洞察所引导。在本综述中,我们阐述了AIHA不断演变的免疫发病机制,并研究新兴的治疗策略,整合其基本原理、临床数据以及对未来治疗模式的影响。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/122d/12350407/80cc3a3f8c5c/fimmu-16-1624667-g001.jpg

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