膠原誘導性關節(jié)炎小鼠(CIA)作為人類類風濕關節(jié)炎模型應用廣泛,但CIA引起的關節(jié)炎起病比較緩慢，造模周期較長，一般為6-8周(1-12)。Chondrex公司已開發(fā)出單一種單克隆抗體合劑誘導的小鼠關節(jié)炎模型（CAIA），明顯縮短了造模周期。與CIA相比，CAIA模型具有以下優(yōu)點: (1)可在大多數小鼠上誘發(fā)關節(jié)炎，包括CIA不敏感的小鼠；(2)CAIA造模周期短，加速篩選和評估類風濕性關節(jié)炎治療藥物；（3）應用于轉基因小鼠來研究基因對關節(jié)炎發(fā)病的影響；（4）用于研究與人類類風濕性關節(jié)炎相關的各種炎癥介質和因素在疾病中的作用，例如細菌和病毒毒素（13-17）。

CAIA without LPS

膠原抗體誘導的關節(jié)炎（不加LPS）

CIA是由于自身抗體形成的免疫復合物通過激活補體而誘發(fā)關節(jié)炎癥，因此研究表明多克隆膠原蛋白抗體(8-19) 或單克隆膠原蛋白抗體合劑能誘發(fā)關節(jié)炎(20-21)。根據MHC類型，這些自身反應性抗體可以識別位于小鼠II型膠原蛋白的CB11或者CB8片段中的特定抗原定簇（關節(jié)炎抗原表位）（22-23）。

Chondrex公司生產的能誘發(fā)小鼠關節(jié)炎的抗體合劑含有 ： A2-10 (IgG2a), F10-21 (IgG2a), D8-6 (IgG2a), D1-2G(IgG2b), and D2-112 (IgG2b). 其中兩個單克隆抗體（F10-21和D8-6）識別在LysC-2(291-374)的83個氨基酸肽段，該肽段有LysC內切酶作用產生。 另外三個單克隆抗體（A2-10,D1-2G和D2-112） 能夠識別二型膠原蛋白CB11片段（124-402）中LysC-1(124-290)的167各氨基酸肽段（13）。這些抗原表位氨基酸序列在各種物種中具有高度保守性，包括雞，小鼠，大鼠，牛，豬，猴子和人 （20-21）。

CAIA with LPS

膠原抗體誘導的關節(jié)炎（加LPS）

研究表明，聯合注射低于致炎劑量的單克隆抗體合劑和大腸桿菌多脂（LPS）可誘發(fā)嚴重的小鼠關節(jié)炎（13）。通過胃腸道吸收的細菌毒素（如LPS）與低致炎水平的二型膠原自身抗體對引發(fā)關節(jié)炎有發(fā)協同作用（24）。這種模型相比于傳統CIA 模型有多重優(yōu)勢。第一，起病時間短，發(fā)病率高達100%。第二，可在大多數小鼠上誘導關節(jié)炎，包括CIA不敏感的小鼠，T細胞缺陷的小鼠，特定基因敲除變異的小鼠，詳情請見表二.

圖一顯示CIA模型和CAIA模型特點的比較。CAIA造模周期是CIA建模周期的十分之一。

圖一 CAIA vs. CIA: (a)三角形：100%的小鼠在LPS注射后24-48小時即可見關節(jié)炎發(fā)作，在第5-7天病情達到高峰。（b）圓形：CIA誘發(fā)小鼠關節(jié)炎模型一般需要4周起病，即使使用CIA易感品系，如DBA/1J和B10.RIII小鼠。

表二 關節(jié)炎炎癥程度的臨床評分

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