CN114796452A - 炎症性皮肤疾病生物标志物DDX5和/或sIL-36R及其应用 - Google Patents
炎症性皮肤疾病生物标志物DDX5和/或sIL-36R及其应用 Download PDFInfo
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- CN114796452A CN114796452A CN202110117195.8A CN202110117195A CN114796452A CN 114796452 A CN114796452 A CN 114796452A CN 202110117195 A CN202110117195 A CN 202110117195A CN 114796452 A CN114796452 A CN 114796452A
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Abstract
本发明公开了sIL‑36R、DDX5、DDX5/sIL‑36R在制备抑制、缓解、减轻和/或治疗特应性皮炎和/或银屑病的药物中的应用。本发明还公开了银屑病和/或特应性皮炎的生物标记物DDX5和/或sIL‑36R和/或DDX5/sIL‑36R及其应用。DDX5在银屑病和/或特应性皮炎皮损处的角质形成细胞中表达下调,但在皮损消退后DDX5的表达回复到正常水平。DDX5的低表达导致角质形成细胞中IL‑36Rpre‑mRNA的可变剪接发生改变,使得IL‑36R增多而可溶性sIL‑36R减少,从而促使IL‑36R信号通路紊乱进而诱发皮肤炎症;而通过注射sIL‑36R能够有效抑制特应性皮炎小鼠或银屑病小鼠中IL‑36R信号通路,抑制特应性皮炎或银屑病小鼠皮损中细胞因子的表达来减轻特应性皮炎。所述sIL‑36R、DDX5、DDX5/sIL‑36R可作为诊治炎症性皮肤疾病的靶点和生物标志物。
Description
技术领域
本发明涉及生物化学、分子生物学、免疫学和皮肤病学等领域,涉及炎症性皮肤疾病生物标志物DDX5和/或sIL-36R及其应用。
背景技术
特应性皮炎(Atopic dermatitis,AD)和银屑病是两种主要的慢性炎症性皮肤疾病。世界卫生组织的数据显示:全球至少有2.3亿人患有特应性皮炎[1],约1.25亿人受到银屑病的影响[2]。其中<7岁儿童中特应性皮炎的患病率高达25%,成年人患特应性皮炎的概率为7-10%。这两种炎症性皮肤疾病不仅发病率高,而且反复发作,给患者的生活带来严重的困扰。
AD和银屑病这两种炎症性疾病在皮肤上的病理表型都主要由角质形成细胞对T细胞产生的细胞因子应答所导致的,但在这两种疾病中起致病作用的T细胞亚群不同,因而作用于角质形成细胞的细胞因子也差别较大[3]。例如,在AD中,Th2细胞分泌的IL-4、IL-13作用于角质形成细胞,不仅抑制角质形成细胞分化基因Flaggerin(FLG)的表达来破坏皮肤屏障功能[4,5],而且能诱导角质形成细胞表达CCL17、CCL22等趋化因子招募大量的炎性细胞浸润在皮损部位[6]。而银屑病中,Th17细胞分泌的IL-17A、IL-17F等细胞因子作用于角质形成细胞,诱导角质形成细胞表达REG3A促进表皮的过度增生[7]或诱导CXCL1、CCL20等趋化因子招募更多的嗜中性粒细胞和Th17细胞的浸润[8],从而加重皮肤炎症表型。
虽然AD和银屑病是具有不同临床、组织和分子表型的两种炎症性皮肤疾病,但是这两种炎症性皮肤疾病在发病机制上也有其相似的机制,即角质形成细胞对外界危险信号的应答在AD和银屑病的炎症起始起了至关重要的作用。在皮肤受损后,受损细胞释放的RNAs激活角质形成细胞TLR3来诱导IL-36的表达[9]。IL-36激活角质形成细胞或树突状细胞中的IL-36受体(IL-36R)信号传导诱导CCL17、CXCL8、CXCL1和CCL20等趋化因子的表达,招募大量的中性粒细胞浸润或激活Th17等细胞分泌更多的细胞因子,从而引发皮肤炎症[10]。已有大量的研究证明IL-36家族细胞因子的高表达和IL-36/IL-36R信号通路的紊乱是引发银屑病(尤其是脓疱型银屑病)的重要因素[11]。而在AD中,IL-36激活IL-36信号通路会促进搔抓,以起始或维持AD炎症[12]。另外,亚洲AD病人兼具欧美AD和银屑病的病理表型,尤其是IL-36在亚洲AD表皮中的高表达是其兼具这两种病理表型的主要因素[13]。综上所述,IL-36家族细胞因子通过结合并激活其受体IL-36R启动下游促炎症信号通路,诱导炎症因子和趋化因子的表达来招募大量的炎性细胞的浸润,从而引发AD和银屑病。因而,IL-36/IL-36R信号通路可作为治疗AD和银屑病等炎症性皮肤疾病的靶点。最近利用IL-36R中和抗体成功治疗7例脓疱型银屑病病人的报道也印证了这一点[14]。而除了IL-36R中和抗体,是否还有其他因子能够拮抗IL-36R信号通路以及拮抗IL-36R信号通路是否能治疗AD仍未知。
DDX5是一种ATP依赖的RNA解旋酶,也称为DEAD盒蛋白5或RNA解旋酶p68[15]。DDX5参与包括RNA结构改变在内的各种途径,可作为转录调节剂、剪接的调节剂并在非编码RNA的加工中发挥作用[16]。RNA剪接(特别是可变剪接)是真核基因表达调控的重要方式之一。可变剪接会导致多种转录本变体的产生,不同的变体在疾病的发生发展中起着至关重要的作用。例如,DDX5/DDX17参与调节转录因子NFAT5的可变剪接促进IL-4和GATA3的表达,可能促进AD中Th2免疫应答[17,18]。另外,已有数据显示DDX5与皮褶型、红皮型以及慢性斑块型银屑病紧密相关[19],而在atopic march相关的疾病基因分析中,DDX5也被发现在哮喘中的表达降低与疾病进程相关[20]。虽然DDX5与AD和银屑病有一定的相关性,但是DDX5是如何参与AD或银屑病的致病以及是否可作为AD和银屑病等炎症性皮肤疾病的诊治生物标志物仍未知。
发明内容
本发明提供了sIL-36R、DDX5、DDX5/sIL-36R在制备抑制和/或缓解和/或减轻和/或治疗特应性皮炎(AD)和/或银屑病的药物中的应用。
所述的sIL-36R通过抑制IL-36/IL-36R信号通路,包括下游的NFκB和p38MAPK信号通路,抑制由IL-36家族细胞因子诱导的炎症反应,进而起到减轻、治疗AD的作用。在MC903诱导的AD小鼠中注射重组的本发明所述的sIL-36R能缓解AD小鼠的病理症状,起到抑制和/或缓解和/或减轻和/或治疗AD的作用。
所述sIL-36R为IL-36的可溶性受体,其仅包括IL-36R的配体结合区域;其氨基酸序列如SEQ ID NO.1或SEQ ID NO.2所示,其核苷酸序列如SEQ ID NO.3或SEQ ID NO.4所示:
小鼠的sIL-36R氨基酸序列如下:
MGVTSLLFCGVFFLLLLFVAADTCEDIFMHNVIISEGQPFPFNCTYPPETNGAVNLTWYKTPSKSPVSNNRHLRVHQDQTWILFLPLTLEDSGIYQCVIRNAHNCYQIAVNLTVLKNHWCDSSMEGSPVNSPDVYQQILPIGKSGSLNCHLYFPESCALDSIKWYKGCEEIKAGKKYSPSGAKLLVNNVAVEDGGSYACSARLTHLGRHFTIRNYIAVNTKEVEYGRRIPNITYPKNNSIEVPLEPMCP。(SEQ ID NO.1)
人的sIL-36R氨基酸序列如下:
MWSLLLCGLSIALPLSVTADGCKDIFMKNEILSASQPFAFNCTFPPITSGEVSVTWYKNSSKIPVSKIIQSRIHQDETWILFLPMEWGDSGVYQCVIKTVTRLKGSGSLFWKPGFW(SEQ ID NO.2)
小鼠的sIL-36R核苷酸序列如下:
atgggggttacatctttgctcttctgtggggtgtttttcctgcttctgcttttcgtggcagcagatacgtgtgaggacatttttatgcacaatgtgataatttcagagggccagccttttcctttcaactgcacatacccgccagaaacaaacggggcagtaaatctgacatggtacaaaacacctagcaaaagcccagtatctaacaacagacaccttagagttcaccaggaccagacctggatcttgtttcttccattgacactggaggactccggtatctatcagtgtgttataaggaatgcccacaactgctaccaaatagctgtgaacctaaccgttttaaaaaaccactggtgtgactcttccatggaggggagtcccgtaaattcaccagatgtgtaccagcaaatattacccataggaaaatcgggcagtctgaattgtcatctctacttcccagaaagttgtgctttggattcaataaaatggtataagggttgtgaagagattaaagcggggaaaaagtacagcccttcaggagcaaagcttcttgtgaacaacgttgctgtggaggacggcgggagctatgcgtgctcagccagactgactcacttggggagacacttcaccattagaaactacattgctgtgaacaccaaggaagttgagtatggaagaaggatccctaacatcacgtatccaaagaacaactccattgaagttccacttgaaccaatgtgtccttga(SEQ ID NO.3)
人的sIL-36R核苷酸序列如下:
ATGTGGTCCTTGCTGCTCTGCGGGTTGTCCATCGCCCTTCCACTGTCTGTCACAGCAGATGGATGCAAGGACATTTTTATGAAAAATGAGATACTTTCAGCAAGCCAGCCTTTTGCTTTTAATTGTACATTCCCTCCCATAACATCTGGGGAAGTCAGTGTAACATGGTATAAAAATTCTAGCAAAATCCCAGTGTCCAAAATCATACAGTCTAGAATTCACCAGGACGAGACTTGGATTTTGTTTCTCCCCATGGAATGGGGGGACTCAGGAGTCTACCAATGTGTTATAAAGACTGTAACGAGATTAAAGGGGAGCGGTTCACTGTTTTGGAAACCAGGCTTTTGGTGA(SEQ ID NO.4)
所述sIL-36R的氨基酸序列,只含有全长受体的配体结合区域,不具有全长受体的跨膜区域和胞内区域。
所述sIL-36R是由缺失第3个外显子IL-36R mRNA转录、翻译后得到,由于IL-36RmRNA缺失第3个外显子使得转录提前终止,因此翻译后蛋白只含有配体结合区域,分泌至胞外。
本发明还提供了所述sIL-36R在制备抑制IL-36诱导的细胞因子和趋化因子产生的药物中的应用。
其中,所述细胞因子包括IL-4、IL-13、TSLP、IL23、IL17a。
其中,所述趋化因子包括CCL17、CCL22、CCL20、CXCL1、CXCL2、CCL3、和CCL11。
其中,所述药物用于抑制角质形成细胞对IL-36的炎症应答。
本发明还提供了所述sIL-36R在制备抑制IL-36/IL-36R信号通路,包括下游信号通路NFκB和p38 MAPK的药物中的应用。
本发明还提供了所述sIL-36R在制备抑制角质形成细胞增殖的药物中的应用。
本发明还提供了一种生物标志物DDX5,所述生物标志物DDX5为RNA解旋酶DDX5,其氨基酸序列如SEQ ID NO.5或SEQ ID NO.6所示,核苷酸序列如SEQ ID NO.7或SEQ ID NO.8所示,理化特征为ATP依赖的RNA解旋酶,参与基因的转录调控,在正常皮肤表皮层角质形成细胞中高表达,其在AD和银屑病病人皮损中的表达显著被抑制。
所述DDX5用于诊断特应性皮炎和/或银屑病的病发和/或治愈和/或复发。
所述DDX5在特应性皮炎和银屑病皮损部位表达降低,而随着皮损消退,所述DDX5的表达回复到正常水平。
本发明还提供了所述生物标志物DDX5在诊断特应性皮炎和/或银屑病等炎症性皮肤疾病的病发和/或治愈和/或复发中的应用。
所述炎症性皮肤疾病包括AD、银屑病等。
所述生物标志物DDX5和sIL-36R在AD和银屑病皮损中表达下降,而在基底细胞癌(BCC)、鳞状细胞癌(SCC)等皮肤癌的角质形成细胞中表达升高。DDX5的减少导致皮肤自发产生AD样和银屑病样炎症,而在病理状态下DDX5的缺失进一步加重AD和银屑病的皮肤炎症。当AD或银屑病病理症状消退后,DDX5的表达回复到正常水平。
本发明还提供了一种组合生物标志物,其包含DDX5、sIL-36R、和/或DDX5/sIL-36R组合。
本发明还提供了所述DDX5、sIL-36R和/或DDX5/sIL-36R组合标志物在诊断特应性皮炎或银屑病等炎症性皮肤疾病的病发和/或治愈和/或复发中的应用。
所述DDX5调节IL-36R pre-mRNA的剪接产生sIL-36R。
DDX5的减少导致IL-36R的增加,但sIL-36R减少,从而导致IL-36/IL-36R信号通路紊乱产生大量的细胞因子和趋化因子来引发皮肤炎症。因此,在AD、银屑病病人及小鼠皮损中DDX5的量相对减少,相应的sIL-36R也减少。
本发明还提供了一种检测试剂/试剂盒,其含有生物标志物DDX5、和/或sIL-36R和/或DDX5/sIL-36R组合。
所述检测试剂/试剂盒用于诊断特应性皮炎或银屑病等炎症性皮肤疾病的病发和/或治愈和/或复发。
本发明还提供了一种药物或药物组合物,其含有生物标志物DDX5、sIL-36R和/或DDX5/sIL-36R组合。
本发明还提出了所述药物或药物组合物在制备抑制和/或缓解和/或减轻和/或治疗特应性皮炎和/或银屑病的药物中的应用。
本发明还提供了一种皮炎自发的小鼠模型,即表皮特异性缺失DDX5的基因敲除小鼠(Ddx5Δ/KC)。该小鼠在出生后2周自发产生特应性皮炎样或银屑病样的皮炎表型。另外,在MC903诱导的角质形成细胞特异缺失DDX5的特应性皮炎小鼠中,DDX5的缺失导致细胞因子IL-4、IL-13、TSLP的增加和趋化因子CCL11、CCL17和CCL22的增多。在咪喹莫特诱导角质形成细胞特异缺失DDX5的银屑病小鼠中,细胞因子IL-23和IL-17a和趋化因子CCL20和CXCL1的分泌增多。
本发明中,所述细胞因子包括IL-4、IL-13、TSLP、IL23、IL17a。所述趋化因子包括CCL3、CCL11、CCL17、CCL22、CCL20、CXCL1和CXCL 2。
本发明还提供了所述皮炎自发的小鼠模型在抑制和/或治疗和/或减轻和/或缓解AD或银屑病等炎症性皮肤疾病中的应用。
本发明还提供了一种抑制和/或治疗和/或减轻和/或缓解特应性皮炎或银屑病的方法,向受试者个体施用所述的可溶性受体sIL-36R、DDX5、DDX5/sIL-36R。
本发明还提出了检测AD和银屑病等炎症性皮肤疾病的病发、治愈和复发的方法,用所述DDX5、sIL-36R和/或DDX5/sIL-36R试剂或试剂盒检测受试者个体皮损中DDX5和/或sIL-36R的表达。
本发明的有益效果包括:本发明提供的可溶性受体sIL-36R,可以抑制IL-36激活的IL-36R信号通路,进而减轻AD的炎症反应,达到治疗AD的目的。本发明还发现DDX5、sIL-36R或DDX5/sIL-36R组合可作为诊治炎症性皮肤疾病的靶点和生物标志物,能够有效抑制、治疗、减轻、缓解AD、银屑病等炎症性皮肤疾病。本发明中,DDX5在银屑病和/或特应性皮炎皮损处的角质形成细胞中表达下调,但在皮损消退后DDX5的表达回复到正常水平。DDX5的低表达导致角质形成细胞中IL-36Rpre-mRNA的可变剪接发生改变,使得IL-36R增多而可溶性sIL-36R减少,从而促使IL-36R信号通路紊乱进而诱发皮肤炎症;而通过注射sIL-36R能够有效抑制特应性皮炎小鼠或银屑病小鼠中IL-36R信号通路,抑制特应性皮炎或银屑病小鼠皮损中细胞因子的表达来减轻特应性皮炎。所述sIL-36R、DDX5、DDX5/sIL-36R可作为诊治炎症性皮肤疾病的靶点和生物标志物。
附图说明
图1表示GEO数据库中正常人、银屑病病人和特应性皮炎患者皮损处DDX5的mRNA的表达。
图2表示银屑病病人皮损和特应性皮炎皮损处DDX5蛋白表达减少,其中,图A表示银屑病病人皮损处DDX5蛋白表达减少,图B表示AD病人皮损处DDX5蛋白表达减少。
图3表示DDX5主要在特应性皮炎(图3A)和银屑病(图3B)病人皮损角质形成细胞中表达减少。
图4表示DDX5在基底细胞癌和鳞状细胞癌中的表达增加。
图5表示DDX5的mRNA和蛋白水平在咪喹莫特(IMQ)涂抹诱导的C57BL/6银屑病小鼠皮损中的表达减少,其中,图A表示IMQ诱导不同天数的银屑病小鼠皮损中DDX5 mRNA的表达,随着诱导天数的延长,DDX5的mRNA的表达显著降低,图B表示IMQ诱导不同天数的银屑病小鼠皮损中DDX5蛋白的表达,随着诱导天数的延长,DDX5蛋白的表达明显降低。
图6表示DDX5的mRNA和蛋白水平在MC903涂抹诱导的C57BL/6特应性皮炎小鼠皮损中的表达减少,其中,图A表示MC903诱导不同天数的特应性皮炎小鼠皮损中DDX5 mRNA的表达,随着诱导天数的延长,DDX5的mRNA的表达显著降低,图B表示MC903导不同天数的特应性皮炎小鼠皮损中DDX5蛋白的表达,随着诱导天数的延长,DDX5蛋白的表达明显降低。
图7表示DDX5蛋白在银屑病和特应性皮炎消退的C57BL/6小鼠皮肤中的表达回复,其中,图A表示小鼠正常皮肤、IMQ诱导的银屑病小鼠皮损以及银屑病消退后同一部位皮肤中DDX5蛋白的表达,图B表示小鼠正常皮肤、MC903诱导的特应性皮炎小鼠皮损以及特应性皮炎消退后同一部位皮肤中DDX5蛋白的表达。
图8表示角质形成细胞中特异敲除DDX5基因(Ddx5Δ/KC)C57BL/6小鼠自发产生特应性皮炎和银屑病样表型。
图9表示咪喹莫特诱导的Ddx5Δ/KC银屑病小鼠病症加重,表皮增厚,其中,图A表示IMQ涂抹后小鼠背部皮肤照片,图B表示银屑病小鼠皮肤切片的苏木精伊红染色,图C表示表皮棘的长度。
图10表示咪喹莫特诱导的Ddx5Δ/KC银屑病小鼠和对照银屑病小鼠相比,银屑病相关细胞因子Il-23、Il-17a和趋化因子Ccl20、Cxcl1的表达显著升高。
图11表示MC903诱导的Ddx5Δ/KC特应性皮炎小鼠中皮炎病症加重,其耳朵厚度与对照小鼠相比增厚明显,表皮增厚显著,图A表示MC903诱导的AD小鼠耳朵照片,图B表示MC903诱导不同天数的AD小鼠耳朵厚度的统计,图C表示耳朵切片的苏木精伊红染色。
图12表示MC903诱导的Ddx5Δ/KC特应性皮炎和对照AD小鼠相比,AD相关细胞因子Il-4、Il-13、Tslp的表达显著升高。
图13表示DDX5调节人和鼠角质形成细胞中IL-36受体的pre-mRNA可变剪接产生可溶性的sIL-36R,图A表示人角质形成细胞中IL-36Rpre-mRNA的剪接,B表示小鼠角质形成细胞中IL-36Rpre-mRNA的剪接。
图14表示角质形成细胞中DDX5的缺失导致IL-36R表达升高,sIL-36R表达减少,图A表示在人的角质形成细胞中敲低DDX5后IL-36Rpre-mRNA的剪接,图B表示DDX5缺失的小鼠的角质形成细胞中IL-36Rpre-mRNA的剪接。
图15表示sIL-36R在咪喹莫特诱导的银屑病小鼠中表达逐渐降低,而IL-36R和IL-36γ表达逐渐升高,图A表示western blot检测蛋白的表达,图B表示统计的蛋白条带灰度的比值。
图16表示sIL-36R在MC903诱导的AD小鼠中表达逐渐降低,而IL-36R和IL-36γ表达逐渐升高,图A表示western blot检测蛋白的表达,图B表示统计的蛋白条带灰度的比值。
图17表示sIL-36R抑制由IL-36γ所介导的DDX5-/-角质形成细胞中的炎症反应。
图18表示注射重组sIL-36R蛋白可以减轻MC903诱导的特应性皮炎小鼠的病理症状。
图19表示注射sIL-36R蛋白可以减少MC903诱导的特应性皮炎小鼠皮损中细胞因子和趋化因子的表达。
具体实验方式
结合以下具体实施例和附图,对本发明作进一步的详细说明,本发明的保护内容不局限于以下实施例。在不背离发明构思的精神和范围下,本领域技术人员能够想到的变化和优点都被包括在本发明中,并且以所附的权利要求书为保护范围。实施本发明的过程、条件、试剂、实验方法等,除以下专门提及的内容之外,均为本领域的普遍知识和公知常识,本发明没有特别限制内容。
实施例1:DDX5在银屑病和特应性皮炎病人皮损中的表达
首先,通过分析GEO数据库中银屑病和特应性皮炎皮肤样本数据,结果如图1所示:与38个正常人样本相比,在28例银屑病和27例特应性皮炎病人皮损中DDX5的mRNA水平降低,在银屑病中皮损DDX5的mRNA的表达下降40%左右,而在特应性皮炎中皮损DDX5的mRNA的表达下降30%左右。
其次,本发明收集了3例特应性皮炎病人、3例银屑病病人和3例正常人皮肤,将皮肤组织加入含有RIPA试剂的击打管中,在4℃,60Hz下,击打3分钟,之后在4℃用12000转离心15分钟,收取上层澄清蛋白样品,用BCA试剂盒检测完蛋白浓度后,用western blot检测20μg总蛋白中DDX5的表达,实验结果如图2所示:与正常人相比,DDX5蛋白在银屑病和AD患者皮损中的表达分别降低了20%和60%。
最后,本发明收集一些正常人、银屑病和AD病人的皮肤,并用4%多聚甲醛固定48小时后,进行一系列脱水后进行石蜡包埋,将包埋好的蜡块切成4μm的薄片,放置在载玻片上。将切片脱蜡后进行抗原修复,用3%BSA封阻以防非特异性染色,之后加入抗DDX5抗体4℃孵育过夜。第二天,孵育对应的二抗后,通过共聚焦显微镜检测DDX5的定位和表达。结果如图3所示:DDX5主要在正常人表皮角质形成细胞中高表达(绿色荧光所示),而在AD和银屑病病人皮损表皮角质形成细胞中绿色荧光明显减弱,表明DDX5在AD和银屑病病人皮损表皮角质形成细胞中的表达显著降低。
综上,Westernblot和免疫荧光染色结果均显示DDX5在正常人表皮角质形成细胞中高表达,而在AD和银屑病患者皮损表皮层中的DDX5表达显著降低。
实施例2:DDX5在皮肤癌中的表达
本发明收集了3例基底细胞癌和3例鳞状细胞癌皮肤切片,将切片脱蜡后进行抗原修复,用3%BSA在室温封阻1小时以防非特异性染色,再加入抗DDX5抗体4℃孵育过夜。第二天,孵育对应的二抗后,通过共聚焦显微镜检测DDX5的定位和表达。实验结果如图4所示:绿色荧光表征DDX5的免疫染色,绿色荧光在基底细胞癌和鳞状细胞癌等皮肤癌的角质形成细胞中光强明显亮于正常人,说明DDX5在人的基底细胞癌和鳞状细胞癌等皮肤癌中的表达高于正常人皮肤。
实施例3:DDX5在银屑病和特应性皮炎小鼠的表达
对于银屑病小鼠模型,给7-8周大的野生型C57BL/6小鼠背部脱毛,从第二天开始在小鼠背部皮肤上连续5天涂抹62.5mg咪喹莫特(IMQ)乳膏诱导小鼠银屑病模型,每天处死一组小鼠取小鼠皮肤组织制备组织切片以及抽提RNA和蛋白,提取RNA的具体操作方法是:取绿豆大小的组织加入到1ml含有3mm磁珠的Trizol中,用组织匀浆仪在4℃击打3分钟,离心5分钟后,吸取上层Trizol,不要取到组织,然后加入1/5的氯仿,震荡10秒后室温静置5分钟,在4℃用12000转离心15分钟,吸取上层透明澄清液,加入等体积异丙醇混匀后在室温静置10分钟。之后在4℃用12000转离心10分钟,管子底部可见乳白色RNA沉淀,用1ml 75%预冷的乙醇洗涤1次,离心5分钟后去掉乙醇,待RNA干燥后加入RNase-free水溶解RNA。使用Nanodrop检测RNA浓度后,用Roche反转录试剂将1μg总RNA反转录成cDNA。提取蛋白的方法和本发明实施例1一致。如图5所示:DDX5的mRNA在IMQ诱导的第一天降低了55%左右,而随着IMQ诱导时间的延长,DDX5的mRNA进一步降低,到第5天的时候降低了75%左右,并且DDX5蛋白在IMQ诱导的第3天有明显的下降,第4、第5天DDX5蛋白与诱导前相比降低了75%左右,说明DDX5的mRNA和蛋白的表达在银屑病皮损中随着疾病加重而降低。
对于特应性皮炎小鼠模型,是在7-8周大的野生型C57BL/6小鼠耳朵上每天涂抹1nm MC903来诱导小鼠AD模型,每天用游标卡尺测量小鼠耳朵厚度,每间隔2天处死一组小鼠,取样抽提RNA和蛋白检测DDX5表达。实验结果如图6所示:DDX5的mRNA在MC903给药涂抹的第4天降低了50%左右,之后一直保持降低的水平,而DDX5的蛋白在MC903给药涂抹的第8天降低了50%,在第12天降低了80%左右,到第16天几乎检测不到,说明DDX5的mRNA和蛋白的表达在AD皮损中随着疾病加重而降低。
综上,这些实验结果说明DDX5的mRNA和蛋白表达在AD和银屑病致病过程中均显著降低。另外,如图7所示:DDX5的表达不仅随疾病进程加重而减少,而且随着疾病的消退其表达回复到正常水平。图A表示在IMQ诱导的银屑病小鼠中,DDX5蛋白在诱导5天的银屑病小鼠皮损中表达显著降低(降低70%左右),而在停药8天银屑病消退后的皮肤中DDX5的表达有所恢复;图B表示DDX5在MC903诱导8天的耳朵样品中表达降低50%左右,在停药10天炎症消退后表达回复到正常水平。
实施例4:表皮特异性缺失DDX5基因的小鼠(Ddx5Δ/KC)自发产生特应性皮炎和银屑病样表型
通过cre-loxP技术构建DDX5fl/fl小鼠,与K14-cre小鼠杂交后生下表皮特异性缺失DDX5(Ddx5Δ/KC)的小鼠,如图8所示:Ddx5Δ/KC小鼠在2周龄时,在胳膊肘内侧或大腿根部出现皮屑,背部皮肤出现皮疹,统计小鼠自发率,结果如图8表格所显示自发概率为72.7%;说明角质形成细胞中缺失Ddx5的小鼠能自发产生特应性皮炎和银屑病。
实施例5:表皮特异性缺失DDX5加重特应性皮炎和银屑病小鼠病理
如本发明实施例3所述分别用IMQ和MC903诱导银屑病和AD小鼠模型,Ddx5Δ/KC银屑病小鼠病理表型加重,主要表现在:如图9A所示Ddx5Δ/KC银屑病小鼠背部皮屑增多,如图9B所示将皮肤样品制成切片进行苏木精伊红染色显示皮损表皮层增厚,统计表皮层的棘突显示棘突明显增加(图9C)。
图10显示利用ELISA检测银屑病皮损中细胞因子和趋化因子的表达,发现银屑病相关细胞因子Il-23从200pg/mg增加到600pg/mg左右,Il-17a从150pg/mg增加到300pg/mg左右,并且趋化因子Ccl20从200pg/mg左右上升到300pg/mg,以及cxcl1从400pg/mg增加到700pg/mg左右。
同样的,Ddx5Δ/KCAD小鼠病理表型加重,主要表现在:如图11A所示Ddx5Δ/KCAD小鼠耳部皮屑显著增多,图11B所示耳朵厚度增加,图11C所示表皮层变厚并且角质形成细胞成海绵状。
RT-PCR检测特应性皮炎皮损中细胞因子和趋化因子的表达,结果如图12所示Ddx5Δ/KCAD小鼠皮损中特应性皮炎相关细胞因子Il-4上调2倍,Il-13上调5,Tslp上调1倍和趋化因子Ccl11上调1倍,Ccl17上调3倍和Ccl22上调0.8倍。
综上,这些结果说明表皮特异性缺失DDX5会加重特应性皮炎和银屑病。
实施例6:DDX5调节IL-36R pre-mRNA的可变剪切
角质形成细胞中IL-36R存在不同的变体。人的角质形成细胞中hsIL-36R是由全长的IL-36R缺失3号外显子所产生的,而在小鼠角质形成细胞中msIL-36R则是由全长的IL-36R缺失第6号外显子所产生的。为了确定DDX5能调节IL-36R pre-mRNA剪接,本发明根据缺失的序列设计了能够区分全长IL-36R和sIL-36R的PCR引物,首先我们利用CRISPR-Cas9技术人角质形成细胞系HaCat中DDX5敲除,得到DDX5–/–HaCat细胞。然后用PCR检测WTDDX5–/–HaCat细胞中IL-36R以及sIL-36R mRNA的表达,实验结果如图13A所示:当人角质形成细胞中的DDX5被敲除后,全长IL-36R mRNA表达增多而sIL-36RmRNA的表达减少。
此外,本发明还分离了DDX5fl/fl和Ddx5Δ/KC2-3天新生小鼠的角质形成细胞,用DNA-PAGE检测WT和Ddx5Δ/KC小鼠的角质形成细胞中IL-36R以及sIL-36R mRNA的表达,如图13B所示:和人源IL-36R一致,当角质形成细胞中的Ddx5缺失后,与对照DDX5fl/fl相比,IL-36R的表达增多,sIL-36R的表达减少。
这些结果说明DDX5参与调节IL-36R pre-mRNA的可变剪切,DDX5的缺失导致IL-36R表达增多而sIL-36R的表达减少。
实施例7:角质形成细胞中因缺失DDX5使IL-36R增加而sIL-36R减少
用western blot的技术手段验证IL-36R和sIL-36R蛋白在角质形成细胞中的表达。首先,在6孔板中培养人的新生儿原代角质形成细胞(NHEK),当细胞密度达到80%时,用lipofectamin2000试剂将100pmol siRNA转入NHEK细胞中,4小时后换成新鲜完全培养基,36小时后,用RIPA裂解细胞,超声破碎细胞,4℃离心15分钟后,收集上清。待上清中蛋白浓度用BCA法测定后,20μg总蛋白用于western blot,实验结果如图14A所示;DDX5被敲低后,角质形成细胞中IL-36R蛋白表达升高了2.5倍,sIL-36R蛋白表达减少了60%左右。
此外,本发明还从Ddx5f/f和Ddx5Δ/KC新生小鼠上分离的角质形成细胞(MKC)中,将细胞接种到6孔板上,当细胞密度达到95%时,和NHEK一样也用RIPA提取蛋白,westernblot检测IL-36R和sIL-36R的表达。结果如图14B所示:与正常的DDX5fl/fl相比,DDX5被敲除后,小鼠角质形成细胞中IL-36R表达升高了1.5倍,sIL-36R表达几乎降低到检测不到。
此外,本发明也在如实施例3所构建的不同天数银屑病和AD小鼠模型中,用western blot检测到随着诱导天数的增加,银屑病和AD小鼠皮损中IL-36R和IL-36γ的表达呈递增趋势,而sIL-36R的表达则随着时间的延长而减少,在银屑病中的表达具体可见在图15中IL-36γ和IL-36R分别在第1天和第2天表达上升,IL-36R在第4天表达量最高,高达35倍;而sIL-36R的表达在第1、第2天表达先增加,到底3天则表达降低,一直持续到第5天。在AD中的表达具体可见图16:IL-36γ和IL-36R分别在第4天和第8天表达上升,而sIL-36R的表达则在第4天有轻微的升高,在第8天开始表达降低,一直到第16天sIL-36R的表达降低了80%左右。
综上,这些结果说明DDX5能调节IL-36Rpre-mRNA的可变剪切,而DDX5的减少或缺失导致角质形成细胞中IL-36R表达增多而sIL-36R蛋白表达减少。而在银屑病和AD病理条件下,由于DDX5的减少,皮损中IL-36R增加而sIL-36R蛋白减少,进一步加重银屑病和AD。
实施例8:sIL-36R抑制角质形成细胞的炎症应答
将DDX5–/–HaCat细胞接种到24孔板中,当细胞密度为85%时在DDX5–/–HaCat细胞转染500ng sIL-36R质粒。36小时后,用100ng/ml的IL-36γ分别刺激WT、DDX5–/–和DDX5–/–+sIL-36R细胞6小时,6小时用Trizol抽提细胞RNA,反转录1μg总RNA。将得到的cDNA加水稀释10倍后进行荧光定量PCR检测。实验结果如图17所示:在角质形成细胞中敲除DDX5后,IL-36γ诱导的CCL20、CXCL1、CXCL2、CCL3、CCL17及CCL22分别上调40倍、10倍、50倍、6倍、4倍和4倍,而在DDX5–/–角质形成细胞中超表达sIL-36R后,IL-36γ诱导的趋化因子CCL20、CXCL1、CXCL2、CCL3、CCL17及CCL22均被抑制。这些结果说明sIL-36R能抑制IL-36γ所诱导的炎症应答。
实施例9:注射重组sIL-36R蛋白能减轻特应性皮炎小鼠的病理症状
向野生型小鼠左耳注射20μl PBS,右耳注射1μg sIL-36R蛋白(20μl)后,再用1nMMC903涂抹小鼠耳朵,连续涂抹15天诱导特应性皮炎。诱导过程中,每天用游标卡尺测量耳朵厚度,给小鼠耳朵拍照。第16天处死小鼠,收集耳朵蛋白、RNA和组织制备切片。如图18和图19所示,重组sIL-36R能显著抑制AD的病发,表现在:如图18所示的小鼠耳朵皮屑明显减少,耳朵厚度和皮损表皮层厚度变薄;RT-PCR检测皮损中细胞因子和趋化因子的表达如图19所示:sIL-36R能显著抑制AD小鼠皮损中细胞因子和趋化因子的表达,具体地Il-4抑制了75%,Il-13抑制了90%,Tslp抑制了80%,以及趋化因子Ccl11抑制70%,Ccl17和Ccl22均抑制了50%。
这些结果说明重组sIL-36R蛋白能减轻特应性皮炎的病理症状,对特应性皮炎起到治疗作用。
本发明的保护内容不局限于以上实施例。在不背离发明构思的精神和范围下,本领域技术人员能够想到的变化和优点都被包括在本发明中,并且以所附的权利要求书为保护范围。
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SEQUENCE LISTING
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gactgggttc taaatgaatt caaacatgga aaagctccta ttctgattgc tacagatgtg 1200
gcctccagag ggctagatgt ggaagatgtg aaatttgtca tcaattatga ctaccctaac 1260
tcctcagagg attatattca tcgaattgga agaactgctc gcagtaccaa aacaggcaca 1320
gcatacactt tctttacacc taataacata aagcaagtga gcgaccttat ctctgtgctt 1380
cgtgaagcta atcaagcaat taatcccaag ttgcttcagt tggtcgaaga cagaggttca 1440
ggtcgttcca ggggtagagg aggcatgaag gatgaccgtc gggacagata ctctgcgggc 1500
aaaaggggtg gatttaatac ctttagagac agggaaaatt atgacagagg ttactctagc 1560
ctgcttaaaa gagattttgg ggcaaaaact cagaatggtg tttacagtgc tgcaaattac 1620
accaatggga gctttggaag taattttgtg tctgctggta tacagaccag ttttaggact 1680
ggtaatccaa cagggactta ccagaatggt tatgatagca ctcagcaata cggaagtaat 1740
gttccaaata tgcacaatgg tatgaaccaa caggcatatg catatcctgc tactgcagct 1800
gcacctatga ttggttatcc aatgccaaca ggatattccc aataa 1845
<210> 8
<211> 1848
<212> DNA
<213> 人工序列
<400> 8
atgtcgagtt attctagtga ccgagaccgc ggccgggatc gagggtttgg tgcacctcga 60
tttggaggga gtagaacagg acccctctct ggaaagaagt ttggaaatcc tggggagaaa 120
ctagttaaaa agaagtggaa tcttgatgag ctgcccaaat ttgagaagaa tttttatcaa 180
gaacaccctg atttggcaag gcgcaccgca caagaggtag atacatacag aagaagcaag 240
gaaattacag ttagaggtca caactgtcca aaacctgttc tgaattttta tgaagcaaac 300
tttcctgcga atgtcatgga tgtgattgca aggcagaact ttactgaacc cactgctatt 360
caagctcagg gctggccagt tgctctcagt ggattggata tggttggagt agctcagact 420
ggatctggga aaacattatc ttatttgctg cctgccattg tacacataaa ccaccagcca 480
ttcctagaga gaggtgatgg gcctatttgc ttggtgctgg caccaactcg agaactggca 540
cagcaggtgc agcaagtggc tgctgaatat tgtcgagctt gtcgcttgaa gtctacttgc 600
atctatggtg gtgctcccaa aggaccacag attcgtgatt tggaaagagg tgtggaaatc 660
tgtattgcaa cacctggaag actgattgac tttttagagt gtgggaaaac caatctgaga 720
agaacaactt accttgtcct tgatgaagct gataggatgc ttgatatggg atttgaaccc 780
cagataagga aaattgtgga tcaaataaga cctgataggc aaacactaat gtggagtgca 840
acttggccaa aagaagtaag acagcttgct gaagatttcc tgaaagacta tattcatatc 900
aatattggtg cactggaact gagtgcaaac cataacattc ttcagattgt ggatgtatgt 960
catgatgtcg aaaaggatga aaagcttatt cgtctgatgg aagaaatcat gagtgagaag 1020
gagaataaaa ctattgtttt tgttgaaacc aaaagaagat gtgatgaact taccagaaaa 1080
atgaggagag atgggtggcc tgccatgggc atccatggtg acaagagtca gcaggaacgt 1140
gactgggttc taaatgaatt caaacatgga aaagctccta ttctgattgc taccgatgtg 1200
gcctccagag ggctagatgt ggaagatgtg aaatttgtca tcaattatga ctaccctaac 1260
tcctcagagg attatattca tcgaattgga agaactgctc gcagtaccaa aacaggcaca 1320
gcatacactt tctttacacc taataacata aagcaagtga gcgaccttat ctctgtgctt 1380
cgggaagcta atcaagcaat taatcccaag ttgcttcagt tggtcgaaga cagaggttca 1440
ggtcgttcca ggggtagagg aggcatgaag gacgatcgtc gtgacagata ctctgcaggc 1500
aaaaggggtg gatttaatac ctttagagac agggaaaact atgacagagg ctactctaat 1560
ctgcttaaga gagattttgg ggctaaaact cagaatggtg tttacagtgc tgcaaattac 1620
accaatggga gctttggaag taattttgta tctgctggca tacagaccag ttttaggact 1680
ggtaatccaa cagggactta ccagaacggt tatgatagca ctcagcaata tggaagtaat 1740
gttgcaaata tgcacaatgg tatgaaccaa caggcatatg catatcctgc taccgcagct 1800
gctgcgccta tgattggcta tcccatgcca acagggtatt ctcaataa 1848
Claims (18)
1.sIL-36R、DDX5、DDX5/sIL-36R在制备抑制和/或缓解和/或减轻和/或治疗特应性皮炎和/或银屑病的药物中的应用。
2.sIL-36R在制备抑制IL-36诱导的细胞因子和趋化因子产生的药物中的应用。
3.如权利要求2所述的应用,其特征在于,所述药物用于抑制角质形成细胞对IL-36的炎症应答。
4.如权利要求2所述的应用,其特征在于,所述细胞因子包括IL-4、IL-13、TSLP、IL23、IL17a;和/或,所述趋化因子包括CCL3、CCL11、CCL17、CCL22、CCL20、CXCL1、CXCL 2。
5.如权利要求1-4之任一项所述的应用,其特征在于,所述sIL-36R的氨基酸序列如SEQID NO.1或SEQ ID NO.2所示,其核苷酸序列如SEQ ID NO.3或SEQ ID NO.4所示。
6.一种生物标志物DDX5,其特征在于,所述生物标志物DDX5为RNA解旋酶DDX5,其氨基酸序列如SEQ ID NO.5或SEQ ID NO.6所示,其核苷酸序列如SEQ ID NO.7或SEQ ID NO.8所示。
7.如权利要求6所述的生物标志物DDX5,其特征在于,所述DDX5在特应性皮炎和/或银屑病皮损部位表达降低,而随着皮损消退,所述DDX5的表达回复到正常水平。
8.如权利要求6所述的生物标志物DDX5,其特征在于,所述DDX5在基底细胞癌、鳞状细胞癌的角质形成细胞中表达升高。
9.一种组合生物标志物,其特征在于,其包含如权利要求6所述的DDX5和/或如权利要求1-4之任一项所述的应用中所述的sIL-36R和/或DDX5/sIL-36R。
10.如权利要求6所述的生物标志物DDX5或如权利要求9所述的组合生物标志物在诊断特应性皮炎和/或银屑病的病发和/或治愈和/或复发中的应用。
11.如权利要求6所述的生物标志物DDX5在调节IL-36Rpre-mRNA剪接产生sIL-36R中的应用。
12.一种检测试剂/试剂盒,其特征在于,其含有如权利要求6所述的生物标志物DDX5和/或如权利要求1-4之任一项所述的应用中所述的sIL-36R和/或DDX5/sIL-36R。
13.如权利要求12所述的检测试剂/试剂盒用于诊断特应性皮炎和/或银屑病的病发和/或治愈和/或复发。
14.一种皮炎自发的小鼠模型,其特征在于,其为表皮特异性缺失DDX5的基因敲除小鼠。
15.如权利要求14所述的皮炎自发的小鼠模型在抑制和/或治疗和/或减轻和/或缓解特应性皮炎和/或银屑病中的应用。
16.一种药物或药物组合物,其特征在于,其含有如权利要求6所述的生物标志物DDX5和/或如权利要求1-4之任一项所述的应用中所述的sIL-36R和/或DDX5/sIL-36R。
17.如权利要求16所述的药物或药物组合物在制备抑制和/或缓解和/或减轻和/或治疗特应性皮炎和/或银屑病的药物中的应用。
18.一种抑制和/或治疗和/或减轻和/或缓解特应性皮炎和/或银屑病的方法,其特征在于,向受试者个体施用sIL-36R、DDX5、DDX5/sIL-36R。
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