Acta Neuropathologica: 马尾副神经节瘤的免疫化学、DNA甲基化和染色体拷贝数特征不同于脊髓外副神经节瘤

2020-10-03 MedSci原创 MedSci原创

嗜铬细胞瘤和副神经节瘤是罕见的神经源性神经内分泌肿瘤,分别起源于肾上腺髓质或副神经节。

嗜铬细胞瘤和副神经节瘤是罕见的神经源性神经内分泌肿瘤,分别起源于肾上腺髓质或副神经节。交感神经副神经节瘤最常见于腹部、骨盆或胸部,而副交感神经节副神经节瘤最常见于头颈部(如颈动脉体瘤)。副神经节细胞瘤,尤其是交感神经型,通常具有激素活性,可以分泌儿茶酚胺,类似于嗜铬细胞瘤。高达40%的副神经节瘤发生在遗传综合征的环境中,最常见的是由于琥珀酸脱氢酶(SDHx)基因的种系突变。从组织学上看,副神经节瘤常表现为主细胞与周围支持细胞的巢状或器质"zellbalen"生长模式。副神经节瘤和嗜铬细胞瘤的免疫组化特征是细胞角蛋白阴性,有突触素、嗜铬粒蛋白、GATA3和酪氨酸羟化酶阳性的主细胞,S100阳性的支持细胞和较小程度的主细胞,并且在大多数遗传病例中SDHB表达缺失。相反,在马尾(CEP)或终丝区出现的罕见副神经节瘤已被证明是激素沉默、临床惰性并有可变的角蛋白表达,这表明这些肿瘤可能代表一个单独的病理实体。

我们回顾性分析了11例男性和6例女性患者的17例CEPs,平均年龄为38岁(范围21-82),无神经内分泌肿瘤家族史。17个肿瘤中有6个表现出明显的神经节细胞或神经节细胞瘤样分化。免疫组化显示,所有CEPs均未显示GATA3阳性或SDHB染色丢失,17个CEPs均为细胞角蛋白阳性。对12例肿瘤进行全基因组DNA甲基化分析,并将其与公开获得的全基因组DNA甲基化数据进行比较。聚类分析显示,CEPs形成了一个独特的表观遗传群,与脊髓外部位的副神经节瘤、嗜铬细胞瘤和其他神经内分泌肿瘤分开。拷贝数分析显示绝大多数CEP都有二倍体基因组,而脊髓外副神经节瘤多为非整倍体并伴有1q三体和1p、3和11的单体,这些在CEP队列中均不存在。

方法:17个马尾副神经节瘤,定义为腰椎、马尾、终丝或骶骨区域的硬膜内脊髓副神经节瘤,从外科(8个)和咨询(9个)UCSF当地IRB批准的神经病理学文件中获得。所有肿瘤标本固定在10%中性缓冲福尔马林中,并包埋在石蜡中。使用2.0毫米一次性活检冲头,从12个马尾副神经节瘤的福尔马林固定的石蜡包埋块中选择性地穿孔肿瘤组织。然后使用QIAamp-DNA-FFPE组织试剂盒提取基因组DNA。按照制造商推荐的方案,使用EZ DNA甲基化试剂盒将250 ng基因组DNA转化为亚硫酸氢盐。

总之,这些发现表明CEPs可能代表一个不同的实体。未来的基因组学研究需要进一步阐明这些肿瘤的分子发病机制。

Ramani, B., Gupta, R., Wu, J. et al. The immunohistochemical, DNA methylation, and chromosomal copy number profile of cauda equina paraganglioma is distinct from extra-spinal paraganglioma. Acta Neuropathol (2020).

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    2021-07-23 windight
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    2020-11-23 yb6560
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