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小鼠模型 PSGL—1+/—;IL—2—/—小鼠模型的构建

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杨扬等

[摘要] 意图 构建PSGL-1+/-;IL-2-/-小鼠模型。 办法 将白介素2敲除(IL-2 KO)小鼠与P-挑选素糖蛋白配体-1敲除(PSGL-1 KO)小鼠杂交,剪尾提DNA后用PCR法检测小鼠的基因型。 成果 IL-2 KO小鼠与PSGL-1 KO小鼠杂交三代后,PSGL-1+/-;IL-2-/-小鼠模型构建成功。 定论 将IL-2 KO小鼠与PSGL-1 KO小鼠杂交三代后,成功树立了PSGL-1+/-;IL-2-/-小鼠模型。

[关键词] P-挑选素糖蛋白配体-1;白介素-2;P-挑选素糖蛋白配体-1敲除小鼠;白介素-2敲除小鼠;动物模型

[中图分类号] R-332 [文献标识码] A [文章编号] 1673-9701(2014)23-0007-03

[Abstract] Objective To construct the PSGL-1+/-;IL-2-/- mice model. Methods PSGL-1 KO mice were mated with IL-2 KO mice. Mice were genotyped by PCR after cut the tail and extracted DNA. Results After PSGL-1 KO mice being mated with IL-2 KO mice for three generations, PSGL-1+/-;IL-2-/- mice were obtained. Conclusion PSGL-1+/-;IL-2-/- mice are established through PSGL-1 KO mice being mated with IL-2 KO mice.

[Key words] PSGL-1;IL-2;PSGL-1 knockout mice;IL-2 knockout mice;Animal model

基因工程小鼠(genetically engineered mouse,GEM)是跟着细胞工程、分子生物学的开展,使用基因打靶、转基因、嵌合体等技能对试验小鼠基因组有意图的改造或润饰,使小鼠有特定的特性或生物表型,以研讨基因的功用、调控机制及与其他基因的相互效果等[1]。基因工程小鼠还能够作为人类的疾病模型,如自发肿瘤模型、自发动脉粥样硬化模型等,研讨疾病的发病机制和药物研讨。基因工程小鼠包含基因敲除小鼠、基因替换小鼠和转基因小鼠[2,3]。本试验所用的两种基因工程小鼠为基因敲除小鼠,分别是白细胞介素-2敲除小鼠(IL-2 KO mouse)和P-挑选素糖蛋白配体-1敲除小鼠(PSGL-1 KO mouse)。为了进一步研讨白细胞介素-2和P-挑选素糖蛋白配体-1在炎症、汗水管及肿瘤疾病中的一起效果,将IL-2 KO 小鼠和PSGL-1 KO 小鼠杂交树立了PSGL-1基因敲除及IL-2为杂合子的PSGL-1+/-;IL-2-/-小鼠模型。能够再使用此小鼠模型树立各种炎症、汗水管及肿瘤等疾病模型,所以此模型可作为研讨PSGL-1和IL-2在炎症、汗水管和肿瘤中效果及相互关系的杰出动物模型。

1 资料与办法

1.1 资料来历

1.1.1 试验动物及养殖 P-挑选素糖蛋白配体-1敲除小鼠(PSGL-1 KO小鼠)和白介素-2敲除小鼠(IL-2 KO小鼠)购自美国Jackson试验室,共4只,男女各2只,周龄6~8周。小鼠在SPF级环境中养殖,动物房温度控制在22℃~28℃,湿度为50%~70%,并且坚持12 h明/12 h暗。小鼠的饲料购自广东省医学试验动物中心并经60Co辐照灭菌的全养分饲料。饮用水高压灭菌。试验设计时刻为2013年6月~2014年3月。

1.1.2 试剂 PCR引物由广州英骏公司组成,蛋白酶K及dNTP购自Sigma公司,Taq酶、Tris饱满酚及氯仿从广州康龙公司订货。

1.2 办法

1.2.1 IL-2基因的判定 突变型IL-2引物的序列:TCG AAT TCG CCA ATG ACA AGA CGC T;野生型IL-2引物的序列:CTA GGC CAC AGA ATT GAA AGA TCT;通用引物序列:GTA GGT GGA AAT TCT AGC ATC ATC C。PCR反响条件:94℃变性3 min,94℃ 30 s,64℃ 45 s,72℃ 45 s,35个循环,72℃2 min充沛延伸。在500 bp处有一条带为IL-2纯合子的小鼠,在342 bp处有一条带为野生型小鼠,在500 bp和324 bp处各有一条带为杂合子小鼠。

1.2.2 PSGL-1基因的判定 野生型PSGL-1基因引物序列:P1:5'-TCAAAA TC GTCATCCCCAAC -3,P2:5'-AGCTTCCTT GTGCTGCTGAC -3'';突变型PSGL-1基因引物序列:P1:5'-CCTT CTAT CGCC TTCT TGA CG-3',P2:5'-TCAAAA TCGTCA TCCCCAAC-3'。PCR反响的条件:94℃变性5 min,94℃30 s,65℃ 1 min,72℃ 1 min,循环35次;72℃延伸2 min。PSGL-1基因敲除的纯合子小鼠在500 bp处有一条带,PSGL-1基因为杂合子的小鼠在140 bp和500 bp处各有一条带。

1.2.3 PSGL-1+/-;IL-2-/-小鼠模型的构建 用IL-2 KO 雄性小鼠与PSGL-1 KO雌性小鼠杂交,第一代小鼠PSGL-1和IL-2基因均为杂合子,用PSGL-1+/-;IL-2+/-雄性小鼠与IL-2 KO雌性小鼠或许用PSGL-1+/-;IL-2+/-雌性小鼠与IL-2 KO雄性小鼠再进行杂交,在第二代可得到PSGL-1+/-;IL-2-/-小鼠。endprint

2 成果

2.1 IL-2 KO小鼠与PSGL-1 KO小鼠杂交状况

IL-2 KO 雄性小鼠与PSGL-1 KO雌性小鼠以1∶2的份额杂交两笼,所生小鼠IL-2和PSGL-1基因悉数为杂合子,共取得24只。用第一代小鼠与IL-2 KO 小鼠杂交,第二代共取得小鼠136只,其间PSGL-1+/-;IL-2-/-小鼠38只。

2.2 PSGL-1+/-;IL-2-/-小鼠的判定成果

把PSGL-1 KO小鼠和IL-2 KO小鼠杂交,在第三代小鼠中,1、3号和4号小鼠为PSGL-1+/-;IL-2-/-小鼠,2号小鼠为PSGL-1+/-;IL-2+/-小鼠。图1A中的5号小鼠为PSGL-1基因的阳性对照,图1B中的5号小鼠为IL-2基因的阳性对照。

3评论

白介素-2(IL-2)是由Morgan等在1976年发现的由T淋巴细胞排泄的一种因子,主要由活化的Ⅰ型辅佐淋巴细胞排泄,主要功用是影响T细胞的增生,促进T细胞的增殖;还促进NK细胞和B细胞的活化、增殖;促进细胞毒性T淋巴细胞的发生和增殖等[4-6]。白介素-2还能够促进NK细胞、T淋巴细胞发生肿瘤坏死因子和干扰素等,并且现在已广泛应用于抗炎和抗肿瘤医治[7-10]。

P-挑选素糖蛋白配体-1(P-selectin glycoprotein ligand-1, PSGL-1)是一种粘附分子,在简直一切类型的白细胞外表表达,是挑选素的配体[11-14]。因而,PSGL-1与表达于白细胞的L-挑选素及表达于活化的血管内皮细胞的E-挑选素和P-挑选素相互效果,然后介导白细胞的黏附[15,16]。因为白细胞黏附与炎症、凝血、创伤修正及肿瘤搬运等密切相关,因而PSGL-1介导的白细胞黏附效果可在多种生理和病理过程中发挥重要的效果。

IL-2敲除小鼠是由Ivan Horak等在1991年构建成功的,IL-2纯合子敲除小鼠在4~9周时会呈现脾、淋巴结肿大、肠道炎症及贫血等疾病的症状。因为白介素-2与PSGL-1在炎症、肿瘤等疾病中都发挥重要效果,为了探究两者是否具有协同或拮抗效果,本试验将白细胞介素-2敲除小鼠和黏附分子P-挑选素糖蛋白配体基因敲除小鼠杂交树立了PSGL-1基因敲除及IL-2为杂合子的PSGL-1+/-;IL-2-/-小鼠模型,在养殖的过程中,因为PSGL-1+/-;IL-2-/-小鼠的免疫力会下降,易感染,因而在养殖的过程中对无菌的要求会愈加严厉,小鼠有必要养殖于SPF环境中,饮用水及饲料有必要是无菌的。能够使用此小鼠模型树立各种炎症、汗水管、本身免疫性疾病及肿瘤模型,也为研讨PSGL-1和IL-2在炎症、汗水管和肿瘤疾病中的效果及相互关系供给了杰出的动物模型。

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[10] 刘大勇,冀成山, 郝鸿泽. 腔内注入重组白介素-2医治肺癌恶性心包积液30例临床调查[J]. 心肺血管病杂志,2011,30(1):75-76.

[11] Hoos A, Protsyuk D, Borsig L. Metastatic growth progression caused by PSGL-1-mediated recruitment of monocytes to metastatic sites[J]. Cancer Res, 2014,74(3):695-704.

[12] Banks JM,Herman CT,Bailey RC. Bromelain decreases neutrophil interactions with P-selectin,but not E-selectin,in vitro by proteolytic cleavage of P-selectin glycoprotein ligand-1[J]. PLoS One,2013,8(11):e78988.

[13] Stadtmann A,Germena G,Block H,et al. The PSGL-1-L-selectin signaling complex regulates neutrophil adhesion under flow[J]. J Exp Med,2013,210(11):2171-2180.

[14] Lo CY,Antonopoulos A,Dell A,et al. The use of surface immobilization of P-selectin glycoprotein ligand-1 on mesenchymal stem cells to facilitate selectin mediated cell tethering and rolling[J]. Biomaterials,2013,34(33):8213-8222.

[15] Moore KL,Stults NL,Diaz S,et al. Identification of a specific glycoprotein ligand for P-selectin(CD62)on myeloid cells[J]. J Cell Biol,1992,118(2):445-456.

[16] McEver RP,Cummings RD. Role of PSGL-1 binding to selectins in leukocyte recruitment[J]. J Clin Invest,1997, 100(11):S97-103.

(收稿日期:2014-04-14)endprint

[9] 杨林,王金万,孙燕. 重组人新式白介素-2医治晚期肿瘤Ⅱ期临床研讨[J]. 我国肿瘤生物医治杂志,2001,8(4):277-280.

[10] 刘大勇,冀成山, 郝鸿泽. 腔内注入重组白介素-2医治肺癌恶性心包积液30例临床调查[J]. 心肺血管病杂志,2011,30(1):75-76.

[11] Hoos A, Protsyuk D, Borsig L. Metastatic growth progression caused by PSGL-1-mediated recruitment of monocytes to metastatic sites[J]. Cancer Res, 2014,74(3):695-704.

[12] Banks JM,Herman CT,Bailey RC. Bromelain decreases neutrophil interactions with P-selectin,but not E-selectin,in vitro by proteolytic cleavage of P-selectin glycoprotein ligand-1[J]. PLoS One,2013,8(11):e78988.

[13] Stadtmann A,Germena G,Block H,et al. The PSGL-1-L-selectin signaling complex regulates neutrophil adhesion under flow[J]. J Exp Med,2013,210(11):2171-2180.

[14] Lo CY,Antonopoulos A,Dell A,et al. The use of surface immobilization of P-selectin glycoprotein ligand-1 on mesenchymal stem cells to facilitate selectin mediated cell tethering and rolling[J]. Biomaterials,2013,34(33):8213-8222.

[15] Moore KL,Stults NL,Diaz S,et al. Identification of a specific glycoprotein ligand for P-selectin(CD62)on myeloid cells[J]. J Cell Biol,1992,118(2):445-456.

[16] McEver RP,Cummings RD. Role of PSGL-1 binding to selectins in leukocyte recruitment[J]. J Clin Invest,1997, 100(11):S97-103.

(收稿日期:2014-04-14)endprint

[9] 杨林,王金万,孙燕. 重组人新式白介素-2医治晚期肿瘤Ⅱ期临床研讨[J]. 我国肿瘤生物医治杂志,2001,8(4):277-280.

[10] 刘大勇,冀成山, 郝鸿泽. 腔内注入重组白介素-2医治肺癌恶性心包积液30例临床调查[J]. 心肺血管病杂志,2011,30(1):75-76.

[11] Hoos A, Protsyuk D, Borsig L. Metastatic growth progression caused by PSGL-1-mediated recruitment of monocytes to metastatic sites[J]. Cancer Res, 2014,74(3):695-704.

[12] Banks JM,Herman CT,Bailey RC. Bromelain decreases neutrophil interactions with P-selectin,but not E-selectin,in vitro by proteolytic cleavage of P-selectin glycoprotein ligand-1[J]. PLoS One,2013,8(11):e78988.

[13] Stadtmann A,Germena G,Block H,et al. The PSGL-1-L-selectin signaling complex regulates neutrophil adhesion under flow[J]. J Exp Med,2013,210(11):2171-2180.

[14] Lo CY,Antonopoulos A,Dell A,et al. The use of surface immobilization of P-selectin glycoprotein ligand-1 on mesenchymal stem cells to facilitate selectin mediated cell tethering and rolling[J]. Biomaterials,2013,34(33):8213-8222.

[15] Moore KL,Stults NL,Diaz S,et al. Identification of a specific glycoprotein ligand for P-selectin(CD62)on myeloid cells[J]. J Cell Biol,1992,118(2):445-456.

[16] McEver RP,Cummings RD. Role of PSGL-1 binding to selectins in leukocyte recruitment[J]. J Clin Invest,1997, 100(11):S97-103.

(收稿日期:2014-04-14)endprint

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