类鼻疽肝脓肿的免疫发病机制与精准诊疗进展

Immunopathogenesis of melioidosis liver abscess and advance in precise diagnosis and treatment

  • 摘要: 类鼻疽肝脓肿(MLA)是由类鼻疽伯克霍尔德菌(Bp)引起的一种严重感染性疾病,多见于东南亚及澳大利亚热带地区,约占类鼻疽病例的12%~18%,好发于30~50岁男性,常合并糖尿病或免疫抑制。Bp通过Ⅲ/Ⅳ型分泌系统抑制巨噬细胞功能、诱导T细胞免疫失调及TLR4基因变异介导免疫逃逸,促进肝脓肿形成。典型临床表现为右上腹痛、黄疸、持续性高热,且常规抗菌药物治疗无效。影像学“蜂窝征”具特征性,确诊依靠Bp培养,成簇规律间隔短回文重复(CRISPR)-BP34等分子诊断技术可提高检测灵敏度。治疗分强化和根除两个阶段,脓肿≥3 cm需引流。新兴疗法如联合用药及噬菌体治疗显示潜力。耐药与长程治疗仍是挑战,未来应加强快速诊断、个体化治疗及多学科协作以改善预后。

     

    Abstract: Melioidosis liver abscess (MLA), caused by Burkholderia pseudomallei (Bp), is a severe infectious disease predominantly found in tropical regions such as Southeast Asia and Australia. MLA accounts for approximately 12% to 18% of melioidosis cases, most frequently affecting the male population aged between 30 and 50 years old; the cases are usually complicated with diabetes or immunosuppression. Bp facilitates the formation of hepatic abscess through immune evasion mechanisms mediated by type Ⅲ/Ⅳ secretion systems, which impair macrophage function, dysregulate T-cell immunity, and involve TLR4 genetic variants. The typical clinical manifestations include right upper quadrant pain, jaundice, and persistent high fever refractory to conventional antibiotic therapy. Imaging often reveals a distinctive 'honeycomb sign', and definitive diagnosis relies on Bp culture. Molecular diagnosis techniques such as clustered regularly interspaced short palindromic repeats (CRISPR)-BP34 can enhance the detection sensitivity. The treatment included two phases: intensification and eradication, and abscesses no less than 3cm require drainage. Emerging therapeutic strategies, including combination drug regimens and phage therapy, show promising potential. However, antimicrobial resistance and prolonged treatment remain significant challenges. Future efforts should be focused on advancing rapid diagnostics, personalized therapeutic approaches and multidisciplinary collaboration so as to improve clinical outcomes.

     

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