骨吸收標(biāo)志物CTXI的檢測(cè)
CTXI是I型膠原交聯(lián)羧基端肽,Ⅰ型膠原由三條肽鏈組成,其中有兩條α(Ⅰ)鏈,一條 α(Ⅱ)鏈,成熟的I型膠原分子的羧基端具有呈非螺旋的 3 條較短的肽鏈結(jié)構(gòu),CTXI是 I 型膠原在降解的時(shí)候從末端解離下來(lái)的肽段。由于膠原蛋白獨(dú)特的三股超螺旋結(jié)構(gòu),性質(zhì)十分穩(wěn)定,一般的加工溫度及短時(shí)間加熱都不能使其分解,從而造成其消化吸收較困難,不易被人體充分利用。
I 型膠原主要分布于皮膚、骨、角膜、肌腱、腫瘤中,CTXI作為Ⅰ型膠原的降解指示劑,以完整的免疫原性蛋白形式進(jìn)入血液中,不再進(jìn)一步分解,故可作為骨吸收標(biāo)志物,主要用于監(jiān)測(cè)絕經(jīng)后婦女和骨量減少個(gè)體的抗骨吸收治療,評(píng)價(jià)患骨代謝疾病(如副甲狀旁腺功能亢進(jìn)、佩吉特病、骨營(yíng)養(yǎng)不良),在局部骨溶解增加的狀態(tài)下,如多發(fā)性骨髓瘤、溶骨性骨轉(zhuǎn)移、類風(fēng)濕性關(guān)節(jié)炎及固定術(shù)中,可觀察到血清CTXI上升,同時(shí)CTXI對(duì)于乳腺癌骨轉(zhuǎn)移早期診斷有一定價(jià)值。
由于這個(gè)端肽表達(dá)量較低(在人血清樣本中濃度為142.6~1638.9pg/ml,在小鼠血清樣本中濃度<545.8pg/ml ),故而研究難度較大,市面產(chǎn)品少。為了滿足研究人員對(duì)其的研究需要,Cloud-Clone針對(duì)性的開發(fā)了CTXI端肽、抗體以及檢測(cè)試劑盒等。端肽(SPA665Hu01、CPA665Hu21、CPA665Hu11、CPA665Hu31)、單克隆抗體(MAA665Hu21)和多克隆抗體(PAA665Hu01、LAA665Hu91和LAA665Hu71)的特異性都有實(shí)驗(yàn)數(shù)據(jù)支撐。檢測(cè)試劑盒可定量測(cè)定人血清、血漿或其他相關(guān)生物液體中CTXI含量(CEA665Hu),Cloud-Clone還開發(fā)了小鼠(CEA665Mu)及大鼠(CEA665Ra)CTXI的檢測(cè)試劑盒,以滿足不同研究者的需要。
目前,Cloud-Clone開發(fā)的CTXI相關(guān)產(chǎn)品質(zhì)量高、重復(fù)性好、靈敏度高。使用此多肽相關(guān)產(chǎn)品發(fā)表的文章有多篇,簡(jiǎn)要列出使用CEA665Hu試劑盒的參考文獻(xiàn),見下表:
表1. 使用Cloud-Clone開發(fā)的CEA665Hu檢測(cè)試劑盒發(fā)表的文章匯總
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