|摘要||目的 报道1个以胞质体和球形体为主要病理改变的肌原纤维肌病家系,分析其临床、病理和基因特点.方法 家系中连续5代10例均在35～40岁出现进行性下肢无力,其中6例出现心肺损害症状,4例出现腹泻.对先证者肌肉活体组织检查标本行组织学、酶组织化学、免疫组织化学(抗tau蛋白、结蛋白、泛素、dysferlin以及dystrophin-C'、N'和R抗体)染色及电镜检查.对肌缩蛋白(MYOT)、α-B晶体蛋白链(CRYAB)、结蛋白、z带选择性接合PDZ蛋白(LDB3)、核纤层蛋白A/C(LMNA)、含硒蛋白N1(SEPN1)基因的外显子以及丝蛋白C(FLNC)基因的第48号外显子进行分析.结果 病理检查显示肌纤维内存在大量胞质体和球形体,伴随结蛋白、tau蛋白、泛素、dysferlin和dystrophin-C'、R蛋白阳性表达.电镜显示包涵体内含致密颗粒样物,其周围为放射样分布的细丝.没有发现上述7种基因外显子序列异常.结论 肌原纤维肌病具有多系统损害特点;肌纤维内存在的胞质体和球形体含有多种微管和膜相关蛋白;该病可能存在未知基因突变.
Objective To report the clinical, myopathological and genetic features in myofibrillar myopathy (MFM) with numerous cytoplasmatic-spheroid bodies. Methods Ten patients in 5 successive generations began to present progressive proximal limbs weakness at 35 to 40 years old. Additionally, 4 cases manifested diarrhea and 6 cases accompanied with cardiorespiratory symptoms. An open biopsy was performed on the proband. In addition to histological, enzymhistochemical staining and ultrastructural examination, immunohistochemical staining with antibody against tau, desmin, ubiquitin, dysferlin, dystrophin-C', dystrophin-N' and dystrophin-R were done. All the exons of the MYOT, CRYAB, DESMIN, LDB3, LMNA, SEPNI gene and the FLNC exon 48 were analysed. Results Cytoplasmatic bodies and spheroid bodies were found in the fibers. The deposited material were positive for tau, desmin, ubiquitin, dysferlin and dystrophin-R, dystrophin-C'. Electron microscope showed granular dense Z-disc material in the inclusions which were surrounded by thin filament. There was no mutation in the above exons of the 7 candidate genes. Conclusions Myofibrillar myopathy involves multiple system impairment. Cytoplasmatic and spheroid bodies contain microtubule and membrane associated protein. The disease might be induced by some unknown genetic abnormities.|