Immunity:从复杂的自体炎症性疾病揭示JAK1激酶的基本功能

2020-08-18 张佳兴 生物探索

自体炎症性疾病(AIDs)是最近十年逐渐被认识的一组少见的遗传性周期性疾病。其病因是由于基因突变使其编码蛋白发生改变,导致固有免疫失调而引起全身性炎症,大多数患者发病较早。

自体炎症性疾病(AIDs)是最近十年逐渐被认识的一组少见的遗传性周期性疾病。其病因是由于基因突变使其编码蛋白发生改变,导致固有免疫失调而引起全身性炎症。大多数患者发病较早,从出生后数小时到十多岁青少年期均可发病,少数患者成年后发病。自体炎症性疾病可由单基因免疫错误引起。

Janus激酶(JAK)家族是一类与细胞因子受体组成性相关的非受体酪氨酸激酶家族,包含4种酪氨酸激酶(JAK1、JAK2、JAK3、TYK2),在免疫系统的重要信号转导中起着枢纽作用,其单基因错误对免疫功能有重要影响。

美国西奈山伊坎医学院的一支研究团队在《Immunity》杂志在线发表了一篇题为“Complex Autoinflammatory Syndrome Unveils Fundamental Principlesof JAK1 Kinase Transcriptional and Biochemical Function”的文章,通过复杂的自身炎症综合症揭示出JAK1激酶转录和生化功能的基本原理。

这项研究缘起于研究人员的一次接诊经历。一名18岁女性在入院时被诊断患有复杂的原发性自身炎症和特应性综合征,并且自出生起就表现出自身炎症性疾病的症状。研究人员根据患者的临床病史和发病特点,初步认为隐性或新生基因突变是导致该患者出现临床综合征的原因,并在病因筛查中确定了一个从头突变体JAK1 c.2108G>T,这种突变导致高度保守区域中703位(S703I)处的丝氨酸替换为异亮氨酸。

为了确定S703I的作用属于功能获得策略(Gainof Fuction, GoF)还是功能失活策略(Loss of Fuction, LoF),研究人员在纤维肉瘤细胞系U4C中进行了实验,结果表明S703I是基底和细胞因子诱导的STAT信号传导的GoF。

随后研究人员进行了进一步的机制研究,发现受体复合体的JAK1支架不受患者突变的影响,表明JAK S703I并不能通过增加受体复合物的形成来激活JAK活性,但研究也发现在没有JAK1活性的情况下,STAT磷酸化程度大大降低。然而,在S703I-JAK1(S703I/K908A)的激酶结构域失活后,细胞因子刺激下的STAT磷酸化异常增加。这一结果表明,S703I-JAK1反式激活JAK2和TYK2,揭示了假激酶结构域除了传统理解的顺式调控外,还可以调节反式伴侣JAK。

在确认JAK1过度活跃是该患者临床疾病的潜在驱动因素之后,研究人员考虑将JAK抑制剂用于该患者的临床治疗。在用低剂量的Tofacitinib(每天5毫克)治疗患者8周后,患者的循环炎症标志物(血沉和C反应蛋白)正常化,之后皮炎也完全好转。治疗6个月后,患者自述胃肠道症状完全缓解。结肠组织活检显示隐窝结构恢复,嗜酸性粒细胞浸润完全消失。在2年的随访期内,患者症状保持稳定。

总之,这项研究表明,自体炎症性疾病可由单基因免疫错误引起,这为个性化医疗提供了新思路,同时也为发现基本生物学原理提供了平台。

原始出处:

Conor N Gruber, Jorg J A Calis, Sofija Buta, et al.Complex Autoinflammatory Syndrome Unveils Fundamental Principles of JAK1 Kinase Transcriptional and Biochemical Function.Immunity. 2020 Jul 30;S1074-7613(20)30313-7. doi: 10.1016/j.immuni.2020.07.006.

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    2020-08-26 14818eb4m67暂无昵称

    遗传性疾病

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  5. [GetPortalCommentsPageByObjectIdResponse(id=1736827, encodeId=744c1e3682727, content=<a href='/topic/show?id=56bf6e024d4' target=_blank style='color:#2F92EE;'>#炎症性疾病#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=41, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=67024, encryptionId=56bf6e024d4, topicName=炎症性疾病)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=9d7334182962, createdName=ms9651749636653578, createdTime=Thu Mar 04 13:12:41 CST 2021, time=2021-03-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1738047, encodeId=26b91e38047b9, content=<a href='/topic/show?id=0abd10215e0' target=_blank style='color:#2F92EE;'>#JAK#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=10215, encryptionId=0abd10215e0, topicName=JAK)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=6e8634348903, createdName=肉我只吃一口, createdTime=Thu Nov 26 20:12:41 CST 2020, time=2020-11-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2030410, encodeId=f606203041020, content=<a href='/topic/show?id=25079e7287' target=_blank style='color:#2F92EE;'>#Immunity#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=29, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=9772, encryptionId=25079e7287, topicName=Immunity)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=21015, createdName=heli0118, createdTime=Tue May 04 16:12:41 CST 2021, time=2021-05-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=813292, encodeId=88de813292f8, content=遗传性疾病, beContent=null, objectType=article, channel=null, level=null, likeNumber=83, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=64245268311, createdName=14818eb4m67暂无昵称, createdTime=Wed Aug 26 08:21:44 CST 2020, time=2020-08-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1496092, encodeId=f7401496092ad, content=<a href='/topic/show?id=9c516685eea' target=_blank style='color:#2F92EE;'>#激酶#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=36, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=66857, encryptionId=9c516685eea, topicName=激酶)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=73449239400, createdName=redcrab, createdTime=Thu Aug 20 03:12:41 CST 2020, time=2020-08-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1547366, encodeId=e7b5154e36698, content=<a href='/topic/show?id=4ef26e01766' target=_blank style='color:#2F92EE;'>#炎症性#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=22, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=67017, encryptionId=4ef26e01766, topicName=炎症性)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=09e813968720, createdName=12498dd9m15暂无昵称, createdTime=Thu Aug 20 03:12:41 CST 2020, time=2020-08-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=811023, encodeId=5d328110231c, content=👍🏻, beContent=null, objectType=article, channel=null, level=null, likeNumber=77, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=25e55411955, createdName=ms5000000741733160, createdTime=Wed Aug 19 16:21:19 CST 2020, time=2020-08-19, status=1, ipAttribution=)]
    2020-08-20 redcrab
  6. [GetPortalCommentsPageByObjectIdResponse(id=1736827, encodeId=744c1e3682727, content=<a href='/topic/show?id=56bf6e024d4' target=_blank style='color:#2F92EE;'>#炎症性疾病#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=41, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=67024, encryptionId=56bf6e024d4, topicName=炎症性疾病)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=9d7334182962, createdName=ms9651749636653578, createdTime=Thu Mar 04 13:12:41 CST 2021, time=2021-03-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1738047, encodeId=26b91e38047b9, content=<a href='/topic/show?id=0abd10215e0' target=_blank style='color:#2F92EE;'>#JAK#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=10215, encryptionId=0abd10215e0, topicName=JAK)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=6e8634348903, createdName=肉我只吃一口, createdTime=Thu Nov 26 20:12:41 CST 2020, time=2020-11-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2030410, encodeId=f606203041020, content=<a href='/topic/show?id=25079e7287' target=_blank style='color:#2F92EE;'>#Immunity#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=29, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=9772, encryptionId=25079e7287, topicName=Immunity)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=21015, createdName=heli0118, createdTime=Tue May 04 16:12:41 CST 2021, time=2021-05-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=813292, encodeId=88de813292f8, content=遗传性疾病, beContent=null, objectType=article, channel=null, level=null, likeNumber=83, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=64245268311, createdName=14818eb4m67暂无昵称, createdTime=Wed Aug 26 08:21:44 CST 2020, time=2020-08-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1496092, encodeId=f7401496092ad, content=<a href='/topic/show?id=9c516685eea' target=_blank style='color:#2F92EE;'>#激酶#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=36, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=66857, encryptionId=9c516685eea, topicName=激酶)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=73449239400, createdName=redcrab, createdTime=Thu Aug 20 03:12:41 CST 2020, time=2020-08-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1547366, encodeId=e7b5154e36698, content=<a href='/topic/show?id=4ef26e01766' target=_blank style='color:#2F92EE;'>#炎症性#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=22, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=67017, encryptionId=4ef26e01766, topicName=炎症性)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=09e813968720, createdName=12498dd9m15暂无昵称, createdTime=Thu Aug 20 03:12:41 CST 2020, time=2020-08-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=811023, encodeId=5d328110231c, content=👍🏻, beContent=null, objectType=article, channel=null, level=null, likeNumber=77, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=25e55411955, createdName=ms5000000741733160, createdTime=Wed Aug 19 16:21:19 CST 2020, time=2020-08-19, status=1, ipAttribution=)]
  7. [GetPortalCommentsPageByObjectIdResponse(id=1736827, encodeId=744c1e3682727, content=<a href='/topic/show?id=56bf6e024d4' target=_blank style='color:#2F92EE;'>#炎症性疾病#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=41, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=67024, encryptionId=56bf6e024d4, topicName=炎症性疾病)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=9d7334182962, createdName=ms9651749636653578, createdTime=Thu Mar 04 13:12:41 CST 2021, time=2021-03-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1738047, encodeId=26b91e38047b9, content=<a href='/topic/show?id=0abd10215e0' target=_blank style='color:#2F92EE;'>#JAK#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=10215, encryptionId=0abd10215e0, topicName=JAK)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=6e8634348903, createdName=肉我只吃一口, createdTime=Thu Nov 26 20:12:41 CST 2020, time=2020-11-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2030410, encodeId=f606203041020, content=<a href='/topic/show?id=25079e7287' target=_blank style='color:#2F92EE;'>#Immunity#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=29, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=9772, encryptionId=25079e7287, topicName=Immunity)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=21015, createdName=heli0118, createdTime=Tue May 04 16:12:41 CST 2021, time=2021-05-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=813292, encodeId=88de813292f8, content=遗传性疾病, beContent=null, objectType=article, channel=null, level=null, likeNumber=83, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=64245268311, createdName=14818eb4m67暂无昵称, createdTime=Wed Aug 26 08:21:44 CST 2020, time=2020-08-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1496092, encodeId=f7401496092ad, content=<a href='/topic/show?id=9c516685eea' target=_blank style='color:#2F92EE;'>#激酶#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=36, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=66857, encryptionId=9c516685eea, topicName=激酶)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=73449239400, createdName=redcrab, createdTime=Thu Aug 20 03:12:41 CST 2020, time=2020-08-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1547366, encodeId=e7b5154e36698, content=<a href='/topic/show?id=4ef26e01766' target=_blank style='color:#2F92EE;'>#炎症性#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=22, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=67017, encryptionId=4ef26e01766, topicName=炎症性)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=09e813968720, createdName=12498dd9m15暂无昵称, createdTime=Thu Aug 20 03:12:41 CST 2020, time=2020-08-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=811023, encodeId=5d328110231c, content=👍🏻, beContent=null, objectType=article, channel=null, level=null, likeNumber=77, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=25e55411955, createdName=ms5000000741733160, createdTime=Wed Aug 19 16:21:19 CST 2020, time=2020-08-19, status=1, ipAttribution=)]
    2020-08-19 ms5000000741733160

    👍🏻

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