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Phosphorylated Alpha-Synuclein Within Cutaneous Autonomic Nerves of Patients With Parkinson's Disease: The Implications of Sample Thickness on Results.
Journal of Histochemistry & Cytochemistry ( IF 1.9 ) Pub Date : 2020-09-14 , DOI: 10.1369/0022155420960250
Ningshan Wang 1 , Jennifer Garcia 1 , Roy Freeman 1 , Christopher H Gibbons 1
Affiliation  

The detection of cutaneous phosphorylated alpha-synuclein (P-syn) in patients with Parkinson’s disease (PD) has ranged from 30% to 100% across different studies. We hypothesize that part of the variability in P-syn detection is due to methodological differences using sections of different tissue thickness. Three skin biopsies were obtained from 29 individuals with PD and 21 controls. Tissues were cut into 10-, 20-, and 50-µm-thick sections and double-stained with protein gene product (PGP) 9.5 and P-syn. We quantified the deposition of P-syn with and without PGP 9.5 in sweat glands, pilomotor muscle, and blood vessels using confocal digital images of autonomic structures. Overall, the P-syn-positive rates with PGP 9.5 colocalization in subjects with PD were 100% using 50 µm sections, 90% using 20 µm sections, and 73% using 10 µm sections with 100% specificity. (No P-syn was detected within control subjects.) Without PGP 9.5, colocalization of the P-syn-positive rates was 100% for all samples, but specificity dropped below 70%. In this study, double-immunostained 50 µm skin biopsy tissue sections are superior to 20 and 10 µm tissue sections at detecting P-syn in subjects with PD. The increased sensitivity is likely secondary to a combination of greater volume of tissue analyzed and improved visualization of nerve fiber architecture.



中文翻译:

帕金森病患者皮肤自主神经内的磷酸化 α-突触核蛋白:样本厚度对结果的影响。

在不同的研究中,帕金森病 (PD) 患者的皮肤磷酸化 α-突触核蛋白 (P-syn) 的检测范围从 30% 到 100%。我们假设 P-syn 检测的部分可变性是由于使用不同组织厚度的切片的方法差异造成的。从 29 名患有 PD 的人和 21 名对照者获得了三份皮肤活检。将组织切成 10、20 和 50 µm 厚的切片,并用蛋白质基因产物 (PGP) 9.5 和 P-syn 进行双染色。我们使用自主结构的共聚焦数字图像量化了 P-syn 在有和没有 PGP 9.5 的情况下在汗腺、毛运动肌肉和血管中的沉积。总体而言,PD 受试者中 PGP 9.5 共定位的 P-syn 阳性率使用 50 µm 切片为 100%,使用 20 µm 切片为 90%,73% 使用具有 100% 特异性的 10 µm 切片。(在对照受试者中未检测到 P-syn。)如果没有 PGP 9.5,所有样品的 P-syn 阳性率的共定位率为 100%,但特异性降至 70% 以下。在这项研究中,双免疫染色的 50 µm 皮肤活检组织切片在检测 PD 受试者的 P-syn 时优于 20 和 10 µm 组织切片。增加的灵敏度可能是由于分析的组织量更大和神经纤维结构可视化的改进相结合。双免疫染色的 50 µm 皮肤活检组织切片在检测 PD 受试者的 P-syn 时优于 20 和 10 µm 组织切片。增加的灵敏度可能是由于分析的组织量更大和神经纤维结构可视化的改进相结合。双免疫染色的 50 µm 皮肤活检组织切片在检测 PD 受试者的 P-syn 时优于 20 和 10 µm 组织切片。增加的灵敏度可能是由于分析的组织量更大和神经纤维结构可视化的改进相结合。

更新日期:2020-09-14
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