產(chǎn)品概述
內(nèi)皮抑素對(duì)內(nèi)皮細(xì)胞的抗生長(zhǎng)和抗遷移作用是眾所周知的。因此,它作為血管生成抑制劑降低維持腫瘤生長(zhǎng)的血液供給的潛在應(yīng)用備受關(guān)注。內(nèi)皮抑素最開始被認(rèn)為是從鼠科動(dòng)物的血管內(nèi)皮瘤(EOMA)細(xì)胞中識(shí)別的膠原蛋白XVIII的20 kDa 蛋白水解片段。人膠原蛋白XVIII由包含至少兩個(gè)變體的N-端區(qū)域,中心三螺旋區(qū)域和C-端非成膠區(qū)域(NC1)組成,而內(nèi)皮抑素來自于C-端非成膠區(qū)域。人內(nèi)皮抑素從非成膠(NC1)區(qū)域釋放的過程還不甚清楚。然而,組織蛋白酶L(Cathepsin L)和彈性蛋白酶(Elastase)被認(rèn)為是在血管內(nèi)皮瘤(EOMA)細(xì)胞中負(fù)責(zé)其產(chǎn)生的蛋白酶。健康捐獻(xiàn)者血清內(nèi)皮抑素的平均濃度是變化的,大約是20ng/ml。
產(chǎn)品原理
本實(shí)驗(yàn)采用雙抗體夾心ELISA法??谷薊ndostatin單抗包被于酶標(biāo)板上,標(biāo)本和標(biāo)準(zhǔn)品中的Endostatin會(huì)與單抗結(jié)合,游離的成分被洗去形成免疫復(fù)合物;加入生物素化的抗人Endostatin抗體,生物素化抗人Endostatin抗體與酶標(biāo)板上結(jié)合的標(biāo)準(zhǔn)品或樣本中的Endostatin結(jié)合而形成免疫復(fù)合物,游離的成分被洗去;加入辣根過氧化物酶標(biāo)記的親合素,親合素與生物素特異性結(jié)合,游離的成分被洗去。加入顯色底物(顯色劑),若反應(yīng)孔中有Endostatin,辣根過氧化物酶會(huì)使無色的顯色劑變藍(lán),加終止液變黃。在450nm處測(cè)OD值, Endostatin濃度與OD450值之間呈正相關(guān),可通過繪制標(biāo)準(zhǔn)曲線求出標(biāo)本中Endostatin濃度。
產(chǎn)品性能
1. 靈敏度:最小可測(cè)人Endostatin達(dá)30pg/ml 。
2. 重復(fù)性:板內(nèi)、板間變異系數(shù)均<10%。
產(chǎn)品組分及儲(chǔ)存條件
名稱
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96 Tests
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48 Tests
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保存條件
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1. 抗體包被板條 (Microwell Plate)
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8×12
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8×6
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2-8℃
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2.標(biāo)準(zhǔn)品 (Standard)
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2 支(凍干)
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1 支(凍干)
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2-8℃
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3.濃縮生物素化抗體 100× (Biotin-Conjugate)
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2 支 (60μl/支)
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1 支(60μl/支)
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2-8℃
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4.濃縮酶結(jié)合物 100× (Streptavidin-HRP)
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2 支 (60μl/支)
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1 支(60μl/支)
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2-8℃(避光)
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5.試劑稀釋液 (Assay Diluent)
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4 瓶(25ml/瓶)
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2 瓶(25ml/瓶)
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2-8℃
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6.濃縮洗滌液 20× (Wash Buffer Concentrate)
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1 瓶 (30ml/瓶)
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1 瓶(30ml/瓶)
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2-8℃
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7.顯色劑 (Substrate Solution)
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1 瓶(12ml/瓶 )
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1 瓶(6ml/瓶)
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2-8℃(避光)
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8.終止液 (Stop Solution)
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1 瓶(12ml/瓶)
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1 瓶(12ml/瓶)
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2-8℃
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9.封板膠紙
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3 張
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2 張
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10.說明書
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1 份
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1 份
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試驗(yàn)所需自備儀器和試劑:
1. 酶標(biāo)儀(450nm檢測(cè)波長(zhǎng)濾光片,570nm或630nm校正波長(zhǎng)濾光片)。
2. 高精度加液器及一次性吸頭:0.5-10μl,2-20μl,20-200μl,200-1000μl。
3. 37℃恒溫箱、蒸餾水或去離子水、坐標(biāo)紙。
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