IL-12B,IL-12Rβ1及IL-12Rβ2基因在Behcet
發(fā)布時(shí)間:2018-04-30 18:19
本文選題:Behcet病 + Vogt-小柳原田綜合征 ; 參考:《重慶醫(yī)科大學(xué)》2014年博士論文
【摘要】:背景 Behcet。˙D)是一種長(zhǎng)期的、慢性的與免疫相關(guān)的炎癥性疾病。其主要的病理特征是多系統(tǒng)的血管炎。主要的臨床表現(xiàn)為反復(fù)發(fā)作的口腔潰瘍及會(huì)陰部潰瘍,結(jié)節(jié)性紅斑等皮膚損害,復(fù)發(fā)性的葡萄膜炎。若病變累及腸道、肺、腎臟及血管等多處,便會(huì)出現(xiàn)相應(yīng)的癥狀。之前有報(bào)道T細(xì)胞功能異常在BD的發(fā)病機(jī)制中起到重要作用,并且T細(xì)胞數(shù)量的增加與BD的活動(dòng)期相關(guān)。研究證實(shí)Th1和Th17細(xì)胞均在BD的發(fā)展過程中起到重要的作用。 Vogt-小柳原田綜合征(VKH syndrome)是累及全身多系統(tǒng)的一種急性彌漫性色素膜炎。其主要的特征有:雙側(cè)的肉芽腫性葡萄膜炎及伴發(fā)的眼外癥狀,如毛發(fā)變白、聽力下降、白癜風(fēng),禿頭癥及中樞神經(jīng)系統(tǒng)損害。在感染或者其他情況引起的對(duì)黑色素細(xì)胞的自身免疫反應(yīng)被認(rèn)為與VKH綜合征的發(fā)病機(jī)理有關(guān)。先前的研究證明CD4T細(xì)胞及一些炎癥性細(xì)胞因子在VKH的發(fā)病過程中起到至關(guān)重要的作用。 盡管這兩種疾病確切的發(fā)病機(jī)制還未完全闡明,近來的研究證實(shí)遺傳的易感性與這兩種疾病密切相關(guān)。人類白細(xì)胞抗原(humanleukocyte antigen) HLA-B51, IL-23R, DHCR7, TLR-2這些基因與BD有顯著的相關(guān)性。另外HLA-DR4, IL-17, STAT4,HLA-DR4, IL-17, STAT4被證實(shí)是VKH綜合征的易感基因。 白介素是免疫系統(tǒng)中有關(guān)信號(hào)轉(zhuǎn)導(dǎo)的細(xì)胞因子的一種,其在調(diào)節(jié)T細(xì)胞功能起著非常重要的作用。IL-12B基因編碼IL-12p40亞基,IL-12p40是IL-12和IL-23的共用亞基。IL-12p40這個(gè)活性亞基主要由巨噬細(xì)胞和樹突狀細(xì)胞(DC)在有病原體或是炎癥因子的情況下產(chǎn)生。IL-12p40缺陷會(huì)引起DC遷移減少并導(dǎo)致DC激活naive T細(xì)胞的能力下降。IL-12p40還被證明與兩類涉及多種免疫反應(yīng)的細(xì)胞Th1和Th17的功能有關(guān),有研究指出分泌不同劑量的IL-12p40對(duì)T細(xì)胞功能有著很顯著的影響。IL-12B基因突變被發(fā)現(xiàn)與強(qiáng)直性脊柱炎、牛皮癬等自身性疾病顯著相關(guān)。IL-12Rβ1是IL-12和IL-23共用受體,,其對(duì)記憶性CD4T細(xì)胞的功能和發(fā)展過程均有非常重要的作用,并且進(jìn)一步的研究已經(jīng)證實(shí)IL-12Rβ1依賴的通路對(duì)Th17細(xì)胞亞群的分化和增殖尤其必要。 IL-12Rβ1缺陷的老鼠出現(xiàn)對(duì)Experimental AutoimmuneEncephalomyelitisn(EAE)的抵抗。IL-12Rβ1基因的突變被證明與很多自身免疫性疾病相關(guān)。IL-12Rβ2是IL-12的另外一個(gè)受體,IL-12Rβ2主要對(duì)Th1的功能有重要的作用并且與IL-17的表達(dá)有密切的關(guān)系。IL-12Rβ2缺陷會(huì)導(dǎo)致激活的T細(xì)胞被招募的數(shù)量減少,而且會(huì)引起炎癥性細(xì)胞因子表達(dá)的異常情況出現(xiàn)。 基于以上背景,這三個(gè)相互關(guān)聯(lián)的基因均與Th1和Th17密切相關(guān),我們想研究它們的基因多態(tài)性是否與我們的疾病密切相關(guān)。我們選擇BD和VKH這兩種最有代表性的葡萄膜炎疾病在足夠的大樣本中進(jìn)行基因易感性研究。在本研究中,我們選取了三個(gè)基因(IL-12B, IL-12Rβ1and IL-12Rβ2)的8個(gè)先前報(bào)道的與自身免疫性疾病有著顯著的相關(guān)性SNP位點(diǎn)進(jìn)行基因多態(tài)性與疾病的相關(guān)性研究。 第一部分IL-12B, IL-12Rβ1及IL-12Rβ2在Behcet病中遺傳易感性研究 目的:探討IL-12B, IL-12Rβ1及IL-12Rβ2基因多態(tài)與Behcet病的相關(guān)性。 方法:本研究中總共包括了806例BD患者,1600例正常對(duì)照。第一階段有400例BD,600例正常人作為研究對(duì)象,第二階段包括了另外的406個(gè)BD患者及1000例正常健康對(duì)照。SNP分型采取PCR-限制性片段基因分型(PCR-restriction fragment length polymorphism assay)的方法。應(yīng)用直接測(cè)序來檢測(cè)分型結(jié)果是否準(zhǔn)確。χ2檢驗(yàn)用來比較基因型及其等位基因頻率在病人和正常人之間是否有差異。 結(jié)果: 1.第一階段選取了三個(gè)基因IL-12B, IL-12Rβ1及IL-12Rβ2的8個(gè)SNP位點(diǎn)進(jìn)行研究,8個(gè)位點(diǎn)在400個(gè)BD病人及600個(gè)正常對(duì)照的樣本中均成功分型,正常對(duì)照樣本的分型結(jié)果數(shù)據(jù)均與哈迪-溫伯格平衡一致。 2.第一階段中,發(fā)現(xiàn)rs3212227"IL-12B基因型CC和等位基因C的頻率在BD患者中明顯高于正常人(pc=0.009, OR1.8,95%CI1.3to2.4; pc=0.024, OR1.3,95%CI1.1to1.6,分別的)。 3.第一階段中,其他七個(gè)SNP的基因型及基因頻率在BD和正常對(duì)照組之間沒有發(fā)現(xiàn)有明顯的統(tǒng)計(jì)學(xué)差異。 4.為了更好地確認(rèn)第一階段的結(jié)果,第二階段中,又研究了另外一組的病人和正常人,結(jié)果發(fā)現(xiàn)此組中rs3212227"IL-12B的基因型CC和等位基因C的頻率在BD患者中也是明顯高于正常人(pc=3.5×104, OR=1.8,95%CI1.4to2.4; pc=0.002, OR=1.4,95%CI1.2to1.6,分別的)。 5.綜合第一階段和第二階段的數(shù)據(jù)進(jìn)行分析,發(fā)現(xiàn)rs3212227"IL-12B的基因型CC和等位基因C與BD有明顯的相關(guān)性(pccomb=6.3×107, OR=1.8,95%CI1.5to2.2; pccomb=2.0×105, OR=1.3,95%CI1.2to1.5,分別的)。 6.由于BD常累及多個(gè)系統(tǒng)及器官,我們將BD的臨床表現(xiàn)與所研究的SNP位點(diǎn)進(jìn)行關(guān)聯(lián)性分析,結(jié)果發(fā)現(xiàn)沒有顯著的統(tǒng)計(jì)學(xué)差異。 結(jié)論:我們的結(jié)果表明在中國漢族人群中,rs3212227"IL-12B的基因型CC和等位基因C的頻率在BD中明顯增高,IL-12B與BD有顯著相關(guān)性。 第二部分IL-12B, IL-12Rβ1及IL-12Rβ2在Vogt-小柳原田綜合征中遺傳易感性研究 目的:研究IL-12B, IL-12Rβ1及IL-12Rβ2基因多態(tài)與Vogt-小柳原田綜合征的相關(guān)性。 方法:研究對(duì)象總共包括了820例VKH患者,1600例正常對(duì)照。第一階段包含400例VKH,600例正常對(duì)照,第二階段包括了另外一組420個(gè)VKH患者和1000例正常健康對(duì)照。采取PCR-限制性片段基因分型(PCR-restriction fragment length polymorphism assay)的方法進(jìn)行SNP分型。直接測(cè)序的應(yīng)用來確認(rèn)分型結(jié)果的準(zhǔn)確性。采用χ2檢驗(yàn)來統(tǒng)計(jì)基因型及其等位基因頻率在VKH患者和正常對(duì)照之間是否有差異。 結(jié)果: 1.在第一階段中,IL-12B, IL-12Rβ1及IL-12Rβ2的8個(gè)SNP位點(diǎn)在VKH病人和正常對(duì)照間進(jìn)行研究,8個(gè)位點(diǎn)在400個(gè)VKH患者及600個(gè)正常人的樣本中成功分型,并且正常對(duì)照樣本的分型數(shù)據(jù)均與哈迪-溫伯格平衡一致。 2.第一階段的研究發(fā)現(xiàn)rs3212227"IL-12B等位基因C的頻率在VKH患者中高于正常人(pc=0.012, OR1.3,95%CI1.1to1.6)。 3.第一階段中,其他七個(gè)SNP的基因型及基因頻率在VKH病人和正常對(duì)照組之間無明顯的相關(guān)性。 4.與第一階段的結(jié)果一致,第二階段中,在另外一組的病人和正常人中,rs3212227"IL-12B的等位基因C的頻率在VKH病人中較正常人相比也是明顯增高(pc=0.046, OR1.3,95%CI1.1to1.6)。 5.第一階段和第二階段的所有數(shù)據(jù)進(jìn)行綜合分析比較,發(fā)現(xiàn)rs3212227"IL-12B的等位基因C是VKH的風(fēng)險(xiǎn)因素(pc=2.5105,OR1.3,95%CI1.2to1.5)。 6.將VKH的臨床特征與所研究的SNP位點(diǎn)進(jìn)行相關(guān)性分析,結(jié)果發(fā)現(xiàn)沒有明顯的統(tǒng)計(jì)學(xué)差異。 結(jié)論:我們的結(jié)果表明:在中國漢族人群中,rs3212227"IL-12B的等位基因C的頻率在VKH病人中明顯增高,IL-12B與VKH有顯著的相關(guān)性。
[Abstract]:Background
Behcet ' s disease ( BD ) is a chronic , chronic , and immune - related inflammatory disease . Its main pathological characteristics are polysystemic vasculitis . The main clinical manifestations include recurrent oral ulcer and ulcer , nodular erythema and other skin damage , recurrent uveal tract inflammation . It has been reported that T cell dysfunction plays an important role in the pathogenesis of BD , and the increase of T cell number is related to the activity of BD . The study confirms that both Th1 and Th17 cells play an important role in BD development .
Vogt - Xiaoliu Primary Field Syndrome ( VKH syndrome ) is a kind of acute diffuse pigmented keratitis involving systemic multi - system . The main features are : bilateral granulomas and associated extraocular symptoms such as hair whitening , hearing loss , vitiligo , alopecia and central nervous system damage . The autoimmune response to melanin cells caused by infection or other conditions is considered to be related to the pathogenesis of VKH syndrome . Previous studies have shown that CD4T cells and some inflammatory cytokines play a crucial role in the pathogenesis of VKH .
Although the exact pathogenesis of these two diseases is not fully elucidated , recent studies have confirmed that genetic susceptibility is closely related to the two diseases . Human leukocyte antigen HLA - B51 , IL - 23R , DHCR7 , TLR - 2 have a significant correlation with BD . In addition , HLA - DR4 , IL - 17 , STAT4 , HLA - DR4 , IL - 17 , STAT4 are confirmed to be susceptible genes of VKH syndrome .
IL - 12p40 gene encodes IL - 12p40 subunit , IL - 12p40 is a common subunit of IL - 12 and IL - 23 . IL - 12p40 has been proved to be related to the function of IL - 12p40 and IL - 12p40 . IL - 12p40 is a common receptor for IL - 12 and IL - 23 . IL - 12p40 is a common receptor for IL - 12 and IL - 23 . IL - 12p40 has been shown to play a very important role in the function and development of memory CD4T cells . IL - 122.beta . 2 is another receptor of IL - 12 , and IL - 122.beta . 2 is the other receptor of IL - 12 , which is closely related to the expression of IL - 17 . IL - 129.beta 2 deficiency can lead to a decrease in the number of activated T cells and cause abnormal expression of inflammatory cytokines .
Based on the above background , these three interrelated genes are closely related to Th1 and Th17 , and we want to study whether their genetic polymorphisms are closely related to our disease . We select two of the most representative samples from BD and VKH to carry out genetic susceptibility in a large enough sample .
Study on the Genetic Susceptibility of the First Part of IL - 12B , IL - 12R尾 1 and IL - 1212尾2 in Behcet ' s Disease
Objective : To investigate the correlation between IL - 12B , IL - 1212尾1 and IL - 1212尾2gene polymorphism and Behcet ' s disease .
Methods : A total of 806 BD patients and 1600 normal controls were included in the study . The first stage consisted of 400 BD and 600 normal controls . The second phase consisted of 406 BD patients and 1000 normal healthy controls . The second phase consisted of 406 BD patients and 1000 normal healthy controls . SNP typing was performed by PCR - restriction fragment length polymorphism assay .
Results :
1 . The eight SNP sites of three genes IL - 12B , IL - 12R尾 1 and IL - 1212尾2 were selected in the first stage , and the 8 sites were successfully typed in 400 BD patients and 600 normal controls , and the data of the normal control samples were consistent with Hardy - berger equilibrium .
2.絎竴闃舵涓
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