Clin Chem:免疫富集-偶联MALDI-TOF质谱法直接检测血清中单克隆游离轻链

2019-10-19 gladiator MedSci原创

目前,游离轻链<span lang="EN-US" style="font-size:12.0pt;mso-bidi-font-size:14.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;; mso-fareast-font-family:宋体;mso-bidi-font-family:&quot;Times New Rom

目前,游离轻链(FLC)定量是目前市面上诊断和监测浆细胞疾病(pcd)患者最敏感的血液分析方法。然而,不同于直接检测单克隆FLCs (mFLCs)方法,基于所述к/λFLC比率的量化κλFLC和判定FLC测定可间接地评估克隆性。通常,异常的FLC比值是PCD的唯一指示,且通过直接方法进行确认可增加诊断的可信度。本研究的目的是开发一种分析灵敏的方法,直接检测mFLCs

首先比浊FLC定量和免疫固定电泳(IFE)评估了患者血清(N = 167)和对IgGIgA和总的和游离κλ轻链富集,并进行MALDI-TOF MS。这些方法相对于分析灵敏度,用含有mFLCs的连续稀释血清测定这些方法的相对分析灵敏度。

与异常血清方法比率(n = 127)43%单克隆抗体的蛋白质可以经IFE证实, 57%可通过MALDI-TOF MS证实,而不需要FLC富集,87%可经FLC富集MALDI-TOF MS确认。在与正常FLC比血清(N = 40),FLC MALDI-TOF MS方法鉴定1mFLC。连续稀释,并通过IFE,比浊法,和FLC MALDI-TOF MS的含血清的MFLC分析表明,FLC MALDI-TOF MS分析具有最高的分析灵敏度

研究表明,与MALDI-TOF MS偶联的FLC免疫富集可以直接检测出mFLCs,显著增加了未加FLC富集的IFEMALDI-TOF MS的异常血清FLC比值的确认,从而为诊断FLC PCDs提供了额外可信度。

原始出处:

Lusia Sepiashvili, Mindy C. Kohlhagen,Direct Detection of Monoclonal Free Light Chains in Serum by Use of Immunoenrichment-Coupled MALDI-TOF Mass Spectrometry

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    2020-01-09 daviiliu
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    2020-09-24 aids221
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    2019-10-21 zhangjingnwpu
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    2019-10-21 jeanqiuqiu

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患者男, 35 岁。右侧臀部、右侧下肢红褐色斑 块、结节8 个月。患者 8 个月前无明显诱因右侧臀 部出现钱币大红褐色斑块,瘙痒明显,搔抓后皮损面 积逐渐扩大; 曾自行外用“皮炎平”等药物治疗,病 情无好转,逐渐扩大,且相互融合,并于右侧腹股沟、 右股内侧陆续出现新皮损。病程中患者无发热、关 节肿痛,睡眠饮食尚可,二便正常,体重无明显变化。 患者既往体健,否认系统性疾病,否认食物药物过敏 史,否认