GRP 胃肠病学研究与实践 1687-630X 1687 - 6121 Hindawi 10.1155 / 2020/7517540 7517540 研究文章 IRE1的抑制 α衰减的脂肪变性在胃肠外营养相关肝病(PNALD)细胞模型 Ningxun 1 混合 1 1 https://orcid.org/0000-0002-3502-7655 交给 1 https://orcid.org/0000-0001-5276-8079 小莉 2 Marano 路易吉 1 新生儿学部门 苏州大学儿童医院 苏州 江苏215025年 中国 sdfey.cn 2 部门的干预 苏州大学第一附属医院 苏州 江苏215006年 中国 sdfyy.cn 2020 3 2 2020 2020 16 10 2019 01 12 2019 10 12 2019 3 2 2020 2020 版权所有©2020 这是一篇在知识共享署名许可下发布的开放访问的文章,该许可允许在任何媒介上不受限制地使用、发布和复制,只要原稿被正确引用。

宗旨。建立大鼠正常肝细胞肠外营养相关性肝病模型,探讨内质网应激(ERS)相关IRE1的作用 αPNALD过程中的信号。 方法。用不同浓度的大豆油乳剂(SO)处理BRL细胞,诱导肝细胞脂肪变性。油红O染色和生化指标分析进一步证实了PNALD细胞病模型。接下来,IRE1 α通过慢病毒通过特定的shRNA被压制和IRE1的作用 α与ers相关蛋白IRE1的表达水平 α和p-IRE1 α被测量。 结果。油红O的结果染色表明PNALD成功建立在BRL细胞和CCK-8的数据显示,其0.6%的是SO进一步施加到由于其更好的感应PNALD和毒性的细胞较少的实验。此外,生物化学参数的值(TBIL,DBIL,ALT,AST和)也升高SO组与NG组相比。IRE1击倒后 α中,PNALD也被诱导而细胞更耐左右。在shIRE1观察生化参数的更少正油红O染色和降低的值 α与shControl相比,两组均接受SO处理。 结论。IRE1 α在PNALD细胞模型中诱导和抑制IRE1 α在细胞疾病模型中导致脂肪变性减少。综合起来,我们的数据表明IRE1 α途径可能参与PNALD的发展。

民生科技-关键技术应用研究项目 SS201644 临床重点疾病的诊断和治疗技术项目 LCZX201612 江苏省妇幼健康重点人才工程 FRC201731 国家自然科学基金项目 81971423 81771626
1.介绍</Ťitle> <p>肠外营养(PN)彻底改变了因肠道功能障碍而导致生长缺陷的新生儿的生活方式[<xref ref-type="bibr" rid="B1"> 1</xref>]。上世纪美国报道了第一例新生儿长期肠外营养[<xref ref-type="bibr" rid="B2"> 2</xref>]。由于PN似乎是治疗这些缺陷的最佳有效疗法,依赖PN生存的患者的数量,无论是年轻的还是年老的,每年都在增加[<xref ref-type="bibr" rid="B3"> 3</xref>]。但长期应用PN可发展为严重疾病,如PN相关性肝病(PNALD)等,可导致较高的发病率和死亡率[<xref ref-type="bibr" rid="B4"> 4</xref>-<xref ref-type="bibr" rid="B6"> 6</xref>]。根据报告,大约50%至66%长期接受PN的儿童最终发展为PNALD [<xref ref-type="bibr" rid="B7"> 7</xref>]。虽然一些公认的危险因素,包括早产、PN长期保存、新生儿质量低和脂肪组成[<xref ref-type="bibr" rid="B8"> 8</xref>-<xref ref-type="bibr" rid="B10"> 10</xref>],被认为是PNALD所致,但确切的具体病因和发病机制仍不清楚。</p> <p>在真核细胞中,内质网(ER)是该进入分泌途径的蛋白质的折叠和运输是必不可少的。ER编排合成,折叠和至少三分之一在真核细胞中的蛋白质的运输。因为在肝细胞中高活性的蛋白质合成活动,要求ER的丰富的副本和精确的调节,以及组织。以往的研究表明ER的那个功能障碍引起的ER应激,可能有助于人类疾病,包括肝脏疾病[<xref ref-type="bibr" rid="B11"> 11</xref>,<xref ref-type="bibr" rid="B12"> 12</xref>]。在内质网受到应激的过程中,内质网内稳态会崩溃,启动一种未折叠蛋白反应(unfolded protein response, UPR) [<xref ref-type="bibr" rid="B13"> 13</xref>]。UPR通过三个换能器调节,肌醇需要酶1(IRE1),蛋白激酶 - [R像-ER激酶(PERK),并激活ER网络中转录因子6(ATF6),[<xref ref-type="bibr" rid="B14"> 14</xref>]。常见的是,它们结合到葡萄糖调节蛋白78(GRP-78)上的ER膜,以促进蛋白质折叠和使用三磷酸腺苷(ATP)防止蛋白聚集。之间的ER驻留伴侣,GRP-78是UPR信令的主剂[<xref ref-type="bibr" rid="B15"> 15</xref>]。近年来,ER应激在非酒精性脂肪肝(NAFLD)、乙型肝炎病毒引起的肝细胞癌、肠衰竭相关性肝病(IFALD)、酒精性肝病(ALD)的发病机制中被报道[<xref ref-type="bibr" rid="B16"> 16</xref>-<xref ref-type="bibr" rid="B19"> 19</xref>]。张某等人。报道称,内质网应激与PNALD雷帕正相关,并与自噬激活,可以通过抑制ROS引起的内质网应激防止PNALD [<xref ref-type="bibr" rid="B20"> 20.</xref>]。我们之前的研究也表明,大豆油基脂质乳剂可引起兔原代肝细胞内质网和线粒体的明显损伤,最终导致内质网应激[<xref ref-type="bibr" rid="B21"> 21</xref>,<xref ref-type="bibr" rid="B22"> 22</xref>]。因此,以往的研究表明,内质网应激可能PNALD的发生,发展有关。</p> <p>本研究采用大豆油基脂乳(SO)对大鼠正常肝细胞进行PNALD模型处理。此外,IRE1<italic> α</italic>通过在肝细胞中特异性shRNA的抑制,探讨内质网应激在PNALD模型中的作用。</p> </sec> <sec id="sec2"> <title>2.材料和方法</Ťitle> <sec id="sec2.1"> <title>2.1。大鼠正常肝细胞</Ťitle> <p>大鼠正常肝细胞(BRL)承蒙以下干细胞库,中国院士,中国提供的。进行日常维护时,BRL细胞在DMEM(赛默飞世,USA)在含有10%FBS(GIBCO,美国)培养基和1%青霉素 - 链霉素(赛默飞世,USA)中在37℃在5%CO培养<sub>2</sub>孵化器。培养基每天更换,直到需要溢出为止。</p> </sec> <sec id="sec2.2"> <title>2.2。慢病毒生产</Ťitle> <p>针对IRE1的shrna<italic> α</italic>经Genewiz合成并退火,如前所述。然后将shRNA产物连接到主载体中。病毒包装用psPAX2 (Addgen #12260)和pMD2处理。G (Addgen #12260)进入293NT细胞。在超速离心后,收集病毒并在培养基中重悬[<xref ref-type="bibr" rid="B23"> 23</xref>]。</p> </sec> <sec id="sec2.3"> <title>2.3。IRE1<italic> </italic>-抑制BRL细胞系的建立</Ťitle> <p>按照IRE1<italic> α</italic>蛋白的表达,所述shRNA-#2被用来转导的细胞BRL。慢病毒感染后,选择具有嘌呤霉素3周细胞。最后,BRL细胞都是GFP阳性和IRE1的表达<italic> α</italic>几乎检测不到,表明IRE1<italic> α</italic>成功建立-抑制BRL细胞系,命名为shIRE1<italic> α</italic>。同时,阴性对照shRNA也被诱导进入BRL细胞,称为shControl。</p> </sec> <sec id="sec2.4"> <title>2.4。PNALD在BRL细胞建模</Ťitle> <p>根据以往的报告[<xref ref-type="bibr" rid="B21"> 21</xref>,程序作了轻微修改如下。用不同浓度的SO处理BRL肝细胞(用DMEM从20% SO稀释0.2%、0.4%、0.6%、1%和2%)。所有后续实验均采用0.6%的浓度。SO是从中国华瑞制药公司获得的。</p> </sec> <sec id="sec2.5"> <title>2.5。CCK-8法</Ťitle> <p>BRL肝细胞在孔的密度接种到96孔板<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"> <mml:mn> 2</mml:mn> <mml:mo> ×</mml:mo> <mml:msup> <mml:mrow> <mml:mn> 10</mml:mn> </mml:mrow> <mml:mrow> <mml:mn> 4</mml:mn> </mml:mrow> </mml:msup> </mml:math> </inline-formula>如先前所描述,每孔和处理的细胞。细胞s were then cultured for 24 h and CCK-8 analysis was performed on them according to the instruction. The absorbance of the formazan derivative was measured at 450 nm using a microplate reader (DNM-9602; Shengke, Shanghai, China). All measurements were performed in triplicate, and all experiments were repeated three times.</p> </sec> <sec id="sec2.6"> <title>2.6。油红O染色</Ťitle> <p>脂滴的积累油红O染色检测。简言之,将细胞用如此处理后所指示的,将细胞固定在10%(<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M2"> <mml:mi> v</mml:mi> <mml:mo> /</mml:mo> <mml:mi> v</mml:mi> </mml:math> </inline-formula>)甲醛10分钟,然后用油红O溶液(0.5%异丙醇,<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M3"> <mml:mi> w ^</mml:mi> <mml:mo> /</mml:mo> <mml:mi> v</mml:mi> </mml:math> </inline-formula>) for 15 min. Following extensive washes with distilled water, cells were stained with hematoxylin for 10 min. The representative images were taken under a light microscope.</p> </sec> <sec id="sec2.7"> <title>2.7。生物化学分析</Ťitle> <p>收集来自实验组培养基。各种生化参数,包括总胆红素(TBIL),直接胆红素(DBIL),丙氨酸转氨酶(ALT)和天冬氨酸转氨酶(AST),从每个样品用自动生化分析仪(LXTM20,美国Beckman公司)进行测定。</p> </sec> <sec id="sec2.8"> <title>2.8。西方墨点法</Ťitle> <p>这些细胞被视为表示,然后用PBS洗两次,其次是细胞溶解在电台免疫沉淀反应试验(里帕)缓冲区包含50 mM Tris-HCl (pH值7.5),150毫米氯化钠,1%钠脱氧胆酸盐,1% Triton x - 100, 5 nM乙二胺四乙酸,0.1%十二烷基硫酸钠(SDS)和完整的蛋白酶抑制剂(罗氏,曼海姆,德国)。冰孵育30 min后,将裂解液进行简单超声处理,4℃离心去除不溶性细胞碎片。将SDS上样缓冲液中的蛋白裂解液在95℃下加热10 min,然后在SDS- page凝胶中电泳。蛋白质样品转移到聚偏二氟乙烯(PVDF)膜上,用指示的一抗在4℃下检测12小时,然后在5%脱脂奶粉中被阻断。PVDF膜与适当的二抗结合辣根过氧化物酶在25℃孵育1小时。最后,使用化学发光的辣根过氧化物酶底物与分子成像仪凝胶Doc XR+体系(Bio-Rad)检测蛋白。</p> </sec> <sec id="sec2.9"> <title>2.9。统计分析</Ťitle> <p>所有值都表示为<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M4"> <mml:mtext> 的意思是</mml:mtext> <mml:mo> ±</mml:mo> <mml:mtext> SD</mml:mtext> </mml:math> </inline-formula>从重复,学生<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M5"> <mml:mi> Ť</mml:mi> </mml:math> </inline-formula>使用GraphPad Prism软件进行配对检验。一个<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M6"> <mml:mi> P</mml:mi> </mml:math> </inline-formula>小于0.05为有统计学意义。</p> </sec> </sec> <sec id="sec3"> <title>3.结果</Ťitle> <sec id="sec3.1"> <title>3.1。PNALD在BRL细胞建模</Ťitle> <p>如图所示<xref rid="fig1a" ref-type="fig"> 图1(a)</xref>,当细胞被SO处理从0.1%到2% 24小时后,油红O染色的扩展量呈剂量依赖性增加,表明经SO处理后获得了脂滴积累。然后用CCK-8方法分析细胞毒性,得到24 ~ 72 h的最佳SO浓度。如图所示<xref rid="fig1b" ref-type="fig"> 图1(b)</xref>-<xref rid="fig1d" ref-type="fig"> 1(d)</xref>当SO处理细胞的浓度为0.6%时,细胞毒性不显著,高于该浓度时,BRL细胞表现出严重的细胞毒性。因此,将0.6% SO用于进一步实验,因为其脂滴积累更大,细胞毒性更小。</p> <fig-group id="fig1"> <label>图1</label> <p>PNALD的细胞模型<italic> 在体外</italic>。(a)用不同浓度的大豆油乳剂(SO)处理大鼠正常肝细胞BRL。油红O染色测定BRL细胞脂肪变性程度。疤痕酒吧:50<italic> μ</italic>用CCK-8法分析经SO处理后的m. (b) BRL细胞活力。NG:未给予(SO未处理BRL细胞)。数据被表示为<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M7"> <mml:mtext> 的意思是</mml:mtext> <mml:mo> ±</mml:mo> <mml:mtext> SD</mml:mtext> </mml:math> </inline-formula> <inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M8"> <mml:msup> <mml:mrow></mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> </mml:mrow> </mml:msup> <mml:mi> P</mml:mi> <mml:mo> <</mml:mo> <mml:mn> 0.001</mml:mn> </mml:math> </inline-formula>。(c)BRL cell viability was analyzed by the method of CCK-8 after treatment with SO for 48 h. NG: not given (BRL cells untreated with SO). The data was presented as<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M9"> <mml:mtext> 的意思是</mml:mtext> <mml:mo> ±</mml:mo> <mml:mtext> SD</mml:mtext> </mml:math> </inline-formula>,<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M10"> <mml:msup> <mml:mrow></mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> </mml:msup> <mml:mi> P</mml:mi> <mml:mo> <</mml:mo> <mml:mn> 0.05</mml:mn> </mml:math> </inline-formula>,<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M11"> <mml:msup> <mml:mrow></mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> </mml:mrow> </mml:msup> <mml:mi> P</mml:mi> <mml:mo> <</mml:mo> <mml:mn> 0.001</mml:mn> </mml:math> </inline-formula>。(d)用CCK-8法分析SO处理72 h后的BRL细胞存活率。NG:未给予(SO未处理BRL细胞)。数据被表示为<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M12"> <mml:mtext> 的意思是</mml:mtext> <mml:mo> ±</mml:mo> <mml:mtext> SD</mml:mtext> </mml:math> </inline-formula>,<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M13"> <mml:msup> <mml:mrow></mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> </mml:msup> <mml:mi> P</mml:mi> <mml:mo> <</mml:mo> <mml:mn> 0.05</mml:mn> </mml:math> </inline-formula>,<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M14"> <mml:msup> <mml:mrow></mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> </mml:mrow> </mml:msup> <mml:mi> P</mml:mi> <mml:mo> <</mml:mo> <mml:mn> 0.001</mml:mn> </mml:math> </inline-formula>。</p> <fig id="fig1a"> <label>(一)</label> <graphic xlink:href="//www.newsama.com/downloads/journals/grp/2020/7517540.fig.001a"></graphic> </fig> <fig id="fig1b"> <label>(b)</label> <graphic xlink:href="//www.newsama.com/downloads/journals/grp/2020/7517540.fig.001b"></graphic> </fig> <fig id="fig1c"> <label>(c)</label> <graphic xlink:href="//www.newsama.com/downloads/journals/grp/2020/7517540.fig.001c"></graphic> </fig> <fig id="fig1d"> <label>(d)</label> <graphic xlink:href="//www.newsama.com/downloads/journals/grp/2020/7517540.fig.001d"></graphic> </fig> </fig-group> <p>治疗后24 h,肝细胞的功能是由几个生化分析参数,包括治疗、DBIL, ALT, AST。肝损伤发生时,它可能导致治疗的积累,DBIL, ALT, AST。令人惊讶的是,所有这些因素的值持续升高(数字<xref rid="fig2a" ref-type="fig"> 图2(a)</xref>-<xref rid="fig2d" ref-type="fig"> 2 (d)</xref>)。综上所述,0.6% SO可以诱导BRL细胞发生PANLD,提示BRL-PANLD细胞疾病模型成功建立。</p> <fig-group id="fig2"> <label>图2</label> <p>SO处理后BRL细胞的生化指标。(a)细胞培养基中总胆红素(TBIL)含量。细胞培养基中直接胆红素(DBIL)的含量。(c)细胞培养基中丙氨酸转氨酶(ALT)的含量。(d)细胞培养基中天冬氨酸转氨酶(AST)的含量。NG:未给予(SO未处理BRL细胞)。数据被表示为<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M15"> <mml:mtext> 的意思是</mml:mtext> <mml:mo> ±</mml:mo> <mml:mtext> SD</mml:mtext> </mml:math> </inline-formula>,<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M16"> <mml:msup> <mml:mrow></mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> </mml:mrow> </mml:msup> <mml:mi> P</mml:mi> <mml:mo> <</mml:mo> <mml:mn> 0.01</mml:mn> </mml:math> </inline-formula>,<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M17"> <mml:msup> <mml:mrow></mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> </mml:mrow> </mml:msup> <mml:mi> P</mml:mi> <mml:mo> <</mml:mo> <mml:mn> 0.001</mml:mn> </mml:math> </inline-formula>。</p> <fig id="fig2a"> <label>(一)</label> <graphic xlink:href="//www.newsama.com/downloads/journals/grp/2020/7517540.fig.002a"></graphic> </fig> <fig id="fig2b"> <label>(b)</label> <graphic xlink:href="//www.newsama.com/downloads/journals/grp/2020/7517540.fig.002b"></graphic> </fig> <fig id="fig2c"> <label>(c)</label> <graphic xlink:href="//www.newsama.com/downloads/journals/grp/2020/7517540.fig.002c"></graphic> </fig> <fig id="fig2d"> <label>(d)</label> <graphic xlink:href="//www.newsama.com/downloads/journals/grp/2020/7517540.fig.002d"></graphic> </fig> </fig-group> </sec> <sec id="sec3.2"> <title>3.2。<斜体>α</斜体> -Suppressed BRL IRE1的代细胞</Ťitle> <p>BRL细胞被携带shControl或shIRE1的慢病毒转导<italic> α</italic>。选择后与嘌呤霉素(0.8<italic> μ</italic>克/毫升)3周,几乎所有的细胞均为阳性GFP(图<xref rid="fig3a" ref-type="fig"> 3(一个)</xref>)。IRE1的表达式<italic> α</italic>通过Western印迹的方法中,仅shIRE1检查<italic> α</italic>-2#获取的目标的有效抑制(图<xref rid="fig3b" ref-type="fig"> 3 (b)</xref>)。因此,shIRE1<italic> α</italic>对2号细胞系进行进一步研究。此外,我们还分析了敲除IRE1后so诱导的细胞毒性<italic> α</italic>, CCK-8分析数据提示IRE1沉默<italic> α</italic>当SO长期(图处理,可以保护细胞免受毒性<xref rid="fig3c" ref-type="fig"> 3 (c)</xref>)。</p> <fig-group id="fig3"> <label>图3</label> <p>击倒的IRE1<italic> α</italic>在BRL细胞。(a)转染指示慢病毒的BRL细胞的代表性图像。shControl表示阴性对照shRNA和shIRE1<italic> α</italic>被shRNA所靶向shIRE1<italic> α</italic>。疤痕酒吧:50<italic> μ</italic>m. (b) western blotting检测蛋白表达。装载GAPDH作为内部控制。NC表示未感染任何病毒的BRL细胞。(c) IRE1敲除后,用CCK-8方法分析细胞存活率<italic> α</italic>分别暴露48h和72h。NG:未给予(SO未处理BRL细胞)。数据被表示为<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M18"> <mml:mtext> 的意思是</mml:mtext> <mml:mo> ±</mml:mo> <mml:mtext> SD</mml:mtext> </mml:math> </inline-formula>,<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M19"> <mml:msup> <mml:mrow></mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> </mml:msup> <mml:mi> P</mml:mi> <mml:mo> <</mml:mo> <mml:mn> 0.05</mml:mn> </mml:math> </inline-formula>,<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M20"> <mml:msup> <mml:mrow></mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> </mml:mrow> </mml:msup> <mml:mi> P</mml:mi> <mml:mo> <</mml:mo> <mml:mn> 0.01</mml:mn> </mml:math> </inline-formula>,<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M21"> <mml:msup> <mml:mrow></mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> </mml:mrow> </mml:msup> <mml:mi> P</mml:mi> <mml:mo> <</mml:mo> <mml:mn> 0.001</mml:mn> </mml:math> </inline-formula>。</p> <fig id="fig3a"> <label>(一)</label> <graphic xlink:href="//www.newsama.com/downloads/journals/grp/2020/7517540.fig.003a"></graphic> </fig> <fig id="fig3b"> <label>(b)</label> <graphic xlink:href="//www.newsama.com/downloads/journals/grp/2020/7517540.fig.003b"></graphic> </fig> <fig id="fig3c"> <label>(c)</label> <graphic xlink:href="//www.newsama.com/downloads/journals/grp/2020/7517540.fig.003c"></graphic> </fig> </fig-group> </sec> <sec id="sec3.3"> <title>3.3。IRE1<italic> </italic>抑制可减弱BRL细胞的脂肪变性</Ťitle> <p>最后,测试内质网应激是否与IRE1相关<italic> α</italic>signal参与了PANLD的开发<italic> 在体外</italic>,细胞按0.6%处理;油红O染色后,细胞形态正常,处理0 h后脂滴极少积聚。有趣的是,处理24 h后,0.6% SO组和0.6% SO- shre1对照组的脂滴积累都很明显,但0.6% SO- shire1的脂滴积累较少<italic> α</italic>,表明IRE1的抑制<italic> α</italic>可以防止PANLD(图<xref rid="fig4a" ref-type="fig"> 图4(a)</xref>)。另外,IRE1的表达<italic> α</italic>治疗后也被确定。当用0.6%SO,IRE1的表达处理<italic> α</italic>而组shIRE1的中检测到很少的表达显着增加<italic> α</italic>。当内质网应激是由IRE1的击倒抑制<italic> α</italic>, IRE1的表达式<italic> α</italic>仅在用SO和SO-shControl组(图处理的细胞积累<xref rid="fig4b" ref-type="fig"> 图4(b)</xref>)。此外,为了进一步评估肝细胞,生化参数,包括TBIL,DBIL,ALT,AST和的功能,进行了分析。当与这样处理,与NG组相比,所有的值中的SO分别增加和SO-shControl基。一旦IRE1<italic> α</italic>与shControl组相比,SO组的TBIL、DBIL、ALT和AST值均有所下降。综合来看,这些数据表明IRE1的抑制作用<italic> α</italic>能明显减弱PANLD的BRL病的细胞模型的脂肪变性。</p> <fig-group id="fig4"> <label>图4</label> <p>IRE1<italic> α</italic>抑制抑制了BRL细胞的脂肪变性。(a)不同组BRL细胞油红O染色的代表性图像。疤痕酒吧:50<italic> μ</italic>m. (b) western blotting检测蛋白表达。装载GAPDH作为内部控制。NC表示未感染任何病毒的BRL细胞。(c)中生化参数(TBIL,DBIL,ALT,AST和)BRL细胞在不同组中的所指示的。NG:未给予(SO未处理BRL细胞)。数据被表示为<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M22"> <mml:mtext> 的意思是</mml:mtext> <mml:mo> ±</mml:mo> <mml:mtext> SD</mml:mtext> </mml:math> </inline-formula>,<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M23"> <mml:msup> <mml:mrow></mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> </mml:msup> <mml:mi> P</mml:mi> <mml:mo> <</mml:mo> <mml:mn> 0.05</mml:mn> </mml:math> </inline-formula>,<inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M24"> <mml:msup> <mml:mrow></mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> <mml:mrow> <mml:mo> ∗</mml:mo> </mml:mrow> </mml:mrow> </mml:msup> <mml:mi> P</mml:mi> <mml:mo> <</mml:mo> <mml:mn> 0.001</mml:mn> </mml:math> </inline-formula>。</p> <fig id="fig4a"> <label>(一)</label> <graphic xlink:href="//www.newsama.com/downloads/journals/grp/2020/7517540.fig.004a"></graphic> </fig> <fig id="fig4b"> <label>(b)</label> <graphic xlink:href="//www.newsama.com/downloads/journals/grp/2020/7517540.fig.004b"></graphic> </fig> <fig id="fig4c"> <label>(c)</label> <graphic xlink:href="//www.newsama.com/downloads/journals/grp/2020/7517540.fig.004c"></graphic> </fig> </fig-group> </sec> </sec> <sec id="sec4"> <title>4.讨论</Ťitle> <p>本研究采用大豆油脂乳体系成功建立大鼠肝细胞PNALD细胞病模型。并比较了两组间反映肝功能的几个生化指标的变化,包括LD的积累和内质网应激相关信号。此外,IRE1<italic> α</italic>建立-抑制BRL细胞系,研究其在PNALD发生发展中的作用。结果表明,当IRE1<italic> α</italic>PNALD抑制时,PNALD的发展下降,提示阻断内质网应激通路对PNALD患者的肝功能有好处。我们的数据表明,PNALD模型中内质网应激相关信号高度激活,这与之前的报道一致[<xref ref-type="bibr" rid="B17"> 17</xref>,<xref ref-type="bibr" rid="B24"> 24</xref>,<xref ref-type="bibr" rid="B25"> 25</xref>]。既往临床试验也表明,使用脂乳的剂量和时间与PNALD的发生率呈正相关[<xref ref-type="bibr" rid="B26"> 26</xref>]。In our data, when treated with high concentration (above 1%) of SO for long term (48 h or 72 h), the lipid droplet accumulation was much higher than the lower group (under 0.6%), this was consistent with the clinical evidence.</p> <p>内质网(ER)控制着分泌蛋白和跨膜蛋白的适当折叠和翻译后修饰。不同的生理和病理条件可引起该细胞器内错误折叠蛋白的积累。这些反过来又可以诱导内质网应激,激活未折叠蛋白反应(unfolded protein response, UPR) [<xref ref-type="bibr" rid="B27"> 27</xref>]。最近,新出现的证据表明IRE1<italic> α</italic>信号传导也可以控制不依赖于上调的细胞通路,影响肝脏脂肪生成、血管生成、动脉粥样硬化、关节炎和抗肿瘤免疫等过程[<xref ref-type="bibr" rid="B28"> 28</xref>-<xref ref-type="bibr" rid="B32"> 32</xref>]。这是否保守的信号途径参与PNALD的发病机制仍不明朗。在这项研究中,我们首次发现IRE1<italic> α</italic>在so处理的BRL细胞中高表达。当IRE1<italic> α</italic>抑制,脂肪变性也被抑制。所有这些数据都表明IRE1<italic> α</italic>可能与PNALD的发展有关。但其潜在的分子机制仍有待进一步研究。</p> <p>综上所述,应用大豆油类脂乳可诱发肝细胞PNALD病模型,触发内质网,导致脂滴积累和内质网应激。此外,IRE1的抑制<italic> α</italic>减少了PNALD细胞的脂肪变性,表明IRE1<italic> α</italic>通路可能参与了PNALD的发生发展。</p> </sec> <back> <sec sec-type="data-availability"> <title>数据可用性</Ťitle> <p>所有作者都认可并确认了数据的可用性,所有用于支持本研究结果的数据均纳入本文。另外,方法和资料可向通讯作者咨询。</p> </sec> <sec> <title>信息披露</Ťitle> <p>崔宁勋和崔明玲是共同第一作者。</p> </sec> <sec sec-type="COI-statement"> <title>的利益冲突</Ťitle> <p>不存在利益冲突。</p> </sec> <sec> <title>作者的贡献</Ťitle> <p>崔宁勋和崔明丽进行了实验、数据分析和手稿的准备。李杰参加了实验。朱雪平和朱晓丽监督了研究的设计和执行,并参与了数据分析、数据解释和论文修改。所有作者阅读并通过了最终论文。崔宁勋和崔明灵对这篇手稿同样有贡献。</p> </sec> <ack> <title>致谢</Ťitle> <p>本研究获得国家自然科学基金(NSFC)资助;编号81771626和81971423);江苏省妇幼健康重点人才工程(第二期)。FRC201731);江苏省临床重点疾病诊断与治疗技术项目(第二期)。LCZX201612);与民生科技-关键技术应用研究项目(编号:SS201644)。</p> </ack> <ref-list> <ref id="B1" content-type="article"> <label>1</label> <element-citation publication-type="journal"> <person-group person-group-type="author"> <name> <surname> Cahova</surname> <given-names> M.</given-names> </name> <name> <surname> Bratova</surname> <given-names> M.</given-names> </name> <name> <surname> 沃尔</surname> <given-names> P.</given-names> </name> </person-group> <article-title> 肠外营养相关肝病:肠道菌群的作用</article-title> <source> <italic> 营养物质</italic> <year> 2017</year> <volume> 9</volume> <issue> 9</issue> </element-citation> </ref> <ref id="B2" content-type="article"> <label>2</label> <element-citation publication-type="journal"> <person-group person-group-type="author"> <name> <surname> Dudrick</surname> <given-names> S. 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