AJRCCM:在肺动脉高压中BMP9和BMP10基因突变及其水平的特征

2021-11-02 刘少飞 MedSci原创

人类遗传学研究揭示了对 PAH 病理生物学的重要见解。该研究试图根据生化表征和患者 BMP9 血浆水平的测量,确定最近发现的 GDF2 中的新杂合突变是否会导致 BMP9 功能丧失。

肺动脉高压 (PAH) 是一种罕见但重要的限制生命的疾病,通常表现为运动时无法解释的呼吸困难。肺病理的特征在于由血管壁中的内皮细胞、平滑肌细胞和成纤维细胞的增殖导致的小肺动脉变窄和闭塞。由此导致的肺血管阻力升高导致严重的 PAH。压力超负荷的右心室最初通过肥大作出反应,但最终扩张并失败。尽管存在现有疗法,但平均无移植 3 年生存率仍仅为60%至70%,需要在对病理生物学更透彻的了解的基础上寻找更有效的治疗方法。最近,在肺动脉高压 (PAH) 患者中发现了 GDF2 中罕见的杂合突变。 GDF2 编码循环 BMP(骨形态发生蛋白)9 型,它是 BMP2 受体的配体。体外表达错义 BMP9 突变蛋白,并评估对 BMP9 蛋白加工和分泌、内皮信号传导和功能活性的影响。 在具有 GDF2 变体的 PAH 患者和对照受试者中检测血浆 BMP9 和 BMP10 水平和活性。 还在更大的对照组(n = 120)和特发性多环芳烃患者(n = 260)中测量了水平。

研究目的:已在肺动脉高压 (PAH) 中鉴定出BMP9中的罕见突变。 尚不清楚在 PAH 中特异性识别的 BMP9 变体是否与那些不完全与 PAH 相关的变体具有不同的功能变化。确定了 GDF2 突变的功能影响,并检测特发性 PAH 患者的血浆 BMP9 和 BMP10 水平。

入选患者:对 1,048 名 PAH 患者进行了全基因组测序,并进行了病例对照罕见变异分析。

研究结果:

BMP9突变及BMP9突变体的特点;

Figure

Pro:BMP9突变体中的活性丧失被预测具有致病性

Figure

携带假定致病性 GDF2 等位基因的肺动脉高压患者失去活性 BMP9,使用经验证无交叉反应性、加标回收率和血浆测定稀释剂的 BMP9 ELISA 方案,该研究测量了患者的循环 BMP9 血浆水平和活性携带 GDF2 突变。

Figure

血浆 BMP9和 pBMP10 水平在肺动脉高压 (PAH) 中没有降低,但一部分 PAH 患者表现出血浆 BMP9 和 pBMP10 水平降低。该研究比较了 BMP9和 pBMP10三分位数之间的临床特征,并且还对配体浓度和临床参数之间的关系(连续变量)进行了相关分析。 在 PAH 患者中,BMP9 和 pBMP10 水平与通过 6 分钟步行测试测量的运动能力无关。 38 名患者可获得与采样时间同时期的血流动力学,但未显示与 BMP 有任何相关性。 值得注意的是,在 PAH 病例中,BMP9 和 pBMP10 水平与体重指数 (BMI) 呈负相关,但在对照受试者中则不然。

Figure

这项研究对欧洲大型 PAH 患者队列中发现的BMP9中罕见的潜在破坏性突变进行了详细的功能分析。 大多数突变导致成熟蛋白质的细胞加工改变和细胞分泌减少。 这些突变与这些个体中 BMP9 的循环水平降低和血浆 BMP9 活性降低有关。 这些发现支持了这些突变在 PAH 病理生物学中的因果作用,并为人类提供了强有力的证据,即 BMP9 水平和活性的降低促进了 PAH 的发展。 此外,两名BMP9基因座缺失患者的发现提供了新的遗传证据,支持 PAH 的因果作用。

 

文章出处:

Hodgson J. Characterization of GDF2 Mutations and Levels of BMP9 and BMP10 in Pulmonary Arterial Hypertension. Am J Respir Crit Care Med. 2020 Mar 1;201(5):575-585. doi: 10.1164/rccm.201906-1141OC. PMID: 31661308; PMCID: PMC7047445.

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    2022-07-28 HNYYM
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    2022-09-22 isabellayj
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    2021-11-02 ms1000000251410274

    学习

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    2021-11-03 学医无涯

    学习一下

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  6. [GetPortalCommentsPageByObjectIdResponse(id=1634100, encodeId=db981634100a2, content=<a href='/topic/show?id=596635e549' target=_blank style='color:#2F92EE;'>#BMP#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=37, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=3575, encryptionId=596635e549, topicName=BMP)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=d95322064897, createdName=HNYYM, createdTime=Thu Jul 28 04:23:08 CST 2022, time=2022-07-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1925470, encodeId=e1e219254e0e9, content=<a href='/topic/show?id=26d633354c9' target=_blank style='color:#2F92EE;'>#动脉高压#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=33354, encryptionId=26d633354c9, topicName=动脉高压)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=44a360, createdName=jklm09, createdTime=Tue Sep 06 22:23:08 CST 2022, time=2022-09-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2036733, encodeId=a4eb2036e3329, content=<a href='/topic/show?id=3bde1518863' target=_blank style='color:#2F92EE;'>#RCC#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=15188, encryptionId=3bde1518863, topicName=RCC)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=d784426, createdName=isabellayj, createdTime=Thu Sep 22 01:23:08 CST 2022, time=2022-09-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1066331, encodeId=d5f1106633140, content=学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=1, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=5f1f5633705, createdName=ms1000000251410274, createdTime=Tue Nov 02 19:39:16 CST 2021, time=2021-11-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1066458, encodeId=f95e10664589f, content=学习一下, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=1, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=b7a31928393, createdName=学医无涯, createdTime=Wed Nov 03 06:19:53 CST 2021, time=2021-11-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1066466, encodeId=112a1066466a9, content=动脉高压 (PAH) 是一种罕见但重要的限制生命的疾病, beContent=null, objectType=article, channel=null, level=null, likeNumber=50, replyNumber=1, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTIrrxxDxnLic8t6EAs38Qfwo6H2h6JMleIgb9OSYf6LMnVDkQEqUXWoSDWboibjhOBI9SJDTXweqQIA/132, createdBy=50aa5321359, createdName=查查佳佳, createdTime=Wed Nov 03 07:09:42 CST 2021, time=2021-11-03, status=1, ipAttribution=)]
    2021-11-03 查查佳佳

    动脉高压 (PAH) 是一种罕见但重要的限制生命的疾病

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