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人白細胞介素 18 定量分析酶聯免疫檢測試劑盒

本試劑盒僅供科研使用 。用於體外定量檢測人血清 、血漿或細胞培養上清液中的 IL-18 濃度 。使用前請仔細閱讀說明書並檢查試劑組

分是否完整 。如有產品包裝破損或質量投拆 ，請在收到貨一個月之內聯係尊龍凱時 。

IL-18簡介 ：

白介 18（IL-18）是一個 18 kDa 的細胞因子 ，結構上與 IL-1 極其相似 ，對 T 細胞的活化有重要影響 。IL-18 的前體缺少信號肽 ，前體

由 IL-1beta 轉換酶（ICE）裂解為成熟的 IL-18 。

有報道稱 IL-18 由下列細胞產生 ：樹突狀細胞 、活化的巨噬細胞 、凱夫勒細胞 、角化細胞 、腸內皮細胞 、格根包爾氏細胞 、腎上腺皮

質細胞等 。其中有報道稱人的角化細胞是 IL-18 的主要產生源 。

IL-18 對 T 輔助細胞起作用 ，其效果是與 IL-12 協同強烈刺激 T 輔助細胞產生 IFN-γ  。當然 ，IL-18 也有許多其它的效用 ，包括刺激

外周血中由單核細胞產生 IFN-γ 和 GM-CSF 水平的升高 ，刺激 T 細胞產生 Th1 類的細胞因子如 IL-2 、IFN-γ 和 GM-CSF 等 ，提高 Th1 類

的細胞表麵的 Fas 配體的表達 。此外 ，在治療腫瘤 、感染和自身免疫方麵 ，IL-18 也是一個重要的預後指標 。

檢測原理:

本試劑盒采用雙抗體夾心ELISA法檢測樣本中IL-18的濃度 。IL-18捕獲抗體已預包被於酶標板上 ，當同時加入標本或參考品和檢測抗

體時 ，其中IL-18蛋白上的不同位點會與捕獲抗體和檢測抗體結合 ，形成夾心複合物 ，錨定在固相載體板上 ，其它遊離的成分通過洗滌的過

程被除去 。隨後加入辣根過氧化物酶標記的親合素 。生物素與親合素特異性結合 ，親合素連接的酶就會與夾心的免疫複合物連接起來 ；其

它遊離的成分通過洗滌的過程被除去 。最後加入顯色劑 ，若樣本中存在IL-18將會形成免疫複合物 ，辣根過氧化物酶會催化無色的顯色劑氧

化成藍色物質 ，在加入終止液後呈黃色 。通過酶標儀檢測 ，讀其450nm處的OD值 ，IL-18濃度與OD450值之間呈正比 ，通過參考品繪製標準曲

線 ，對照未知樣本中OD值 ，即可算出標本中IL-18濃度 。

人IL-18定量分析酶聯免疫檢測試劑盒組成:

組分 規格（96T/48T）

人IL-18預包被板 12條/6條

樣本分析緩衝液 5ml/3ml

人IL-18標準品稀釋液 10ml/5ml

人IL-18標準品 4支/2支(凍幹)

生物素化抗體 5ml/2.5ml

HRP酶稀釋液 11ml/5.5ml

5000×HRP連接的酶結合物 2.2μ L/1.1μ L

濃縮洗滌液 30ml/15ml

TMB底物 10ml/5 ml

終止液 5ml/3 ml

封板膠紙 3/2張

說明書 1份

標本收集:

1.標本的收集請按下列流程進行操作 ；

A.細胞上清標本離心去除懸浮物後即可 ；

B.血清標本應是自然凝固後 ，取上清 ，避免在冰箱中凝固血液 ；

C.血漿標本 ，推薦用EDTA的方法收集若待測樣本不能及時檢測 ，D.標本收集後請分裝 ，凍存於－20℃，避免反複凍融 。

2.血清標本不應添加任何防腐劑或抗凝劑 ；

3.標本應清澈透明 ，檢測前樣本中如有懸浮物應通過離心去除 。

4.請勿使用溶血 ，高血脂或汙染的標本檢測 ，否則結果將不準確 。

注 ：人血清或血漿樣本請用樣本分析緩衝液做倍比稀釋後再檢測 。

注意事項:

1.試劑盒請保存在2～8℃ 。

2.濃縮洗滌液因在低溫下可能有結晶 ，請水浴加熱使結晶完全溶解後再配製工作液 。

3.標準品複溶加樣後 ，剩餘部分請丟棄 。

4.底物請勿接觸氧化劑和金屬 。

5.加樣時 ，請及時更換槍頭 ，避免交叉汙染 。

6.嚴禁混用不同批號的試劑盒組份 。

7.充分混勻對保證反應結果的準性很重要 ，在加液後請輕輕叩擊邊緣以保證混勻 。

8.室溫反應 ，請嚴格控製在25～28℃ 。

9.洗滌過程是至關重要的 ，洗滌不充分會使精確度下降並導致結果誤差較大 。

10.試驗中標準品和樣本檢測時建議作雙複孔 。

11.加樣過程中避免氣泡的產生 。

12.血清和血漿標本的檢測時 ，檢測抗體的孵育時間應適當延長 。

檢測前準備工作:

1.試劑盒自冰箱中取出後應置室溫（25～28℃）平衡20分鍾 ；每次檢測後剩餘試劑請及時於2～8℃保存 。

2.將濃縮洗滌液用雙蒸水或去離子水稀釋(1份加19份水) 。

3.如有5X準品稀釋液 ，請按所需量用雙蒸水或去離子水稀釋(1份加4水) 。

4.標準品: 按標簽複溶體積加入標準品稀釋液複溶使IL-18終濃度達到5000pg/ml ，室溫反應 ，請嚴格控製在25～28℃ ，靜置15~20分鍾後輕

輕混懸（建議抽吸幾次）待徹底溶解 ，用標準品稀釋液倍比梯度稀釋後依次加入檢測孔中 。（標準曲線取七個點 ，最高濃度為5000 pg/ml,

標準品稀釋液直接加入作為0濃度.）

洗滌方法:

自動洗板機或人工洗板 ：每孔洗滌液為300ul ，注入與吸出間隔15-30秒 。洗板5次 。最後一次洗板完成後將板倒扣著在厚吸水紙上用力拍幹 。

實驗過程需自備的材料 ：

1.不同規格的加樣槍及相應的槍頭 ；

2.酶標儀；

3.自動洗板機 ；

4.去離子水或雙蒸水 ；

操作步驟:

1.通過計算並確定一次性實驗所需的板條數 ，取出所需板條放置在框架內 ，暫時用不到板條請放回鋁箔袋密封 ，保存於4℃ 。

上海尊龍凱時生物科技有限公司 www.ruianjituan.com人IL-18標準曲線

0

0.5

1

1.5

2

2.5

0 156.25 312.5 625 1250 2500 5000

人IL-18濃度（pg/ml）

O

D值

上海尊龍凱時生物科技有限公司 www.ruianjituan.com

2.建議設置本底較正孔 ，即空白孔,設置方法為該孔隻加TMB顯色液和中止液 。每次實驗均需做標準品對照並畫出標準曲線 。

3.分別將標本或不同濃度標準品(100ul/孔)加入相應孔中 ，對於血清或血漿標本 ，請加入50 ul樣本分析緩衝液後加50 ul標本, 如稀釋量

大 ，請將樣本與樣本分析緩衝液等量加入 ，不足部分用標準品稀釋液補充至100ul 。

4.加入生物素化抗體工作液(50ul/孔) 。用封板膠紙封住反應孔 ，室溫（25～28℃）孵育120分鍾 。

5.洗板5次 ，且最後一次置厚吸水紙上拍幹 。

6.加入親和素連接的HRP酶工作液(100ul/孔) 。用封板膠紙封住反應孔 ，避光室溫（25～28℃）孵育30分鍾 。

7.洗板5次 ，且最後一次置厚吸水紙上拍幹 。

8.加入顯色劑TMB100ul/孔 ，避光室溫（25～28℃）孵育20分鍾 。

9.加入終止液50ul/孔,混勻後即刻測量OD450值 。

結果判斷:

1.複孔的值在20%的差異範圍內結果才有效 ，複孔的值平均後可作為測量值 。

2.每個標準品或標本的OD值應減去本底校正孔的OD值 。

3.手工繪製標準曲線 。以標準品濃度作橫坐標 ，OD值作縱坐標，以平滑線連接各標準品的坐標點 。通過標本的OD值可在標準曲線上查出其

濃度 。

4.若標本 OD 值高於標準曲線上限 ，應適當稀釋後重測 ，計算濃度時應乘以稀釋倍數 。

典型數值和參考曲線

濃度pg/ml 典型OD值1 典型OD值2 OD平均值

0 0.1491 0.1151 0.1321

156.25 0.3517 0.2965 0.3241

312.5 0.4672 0.4502 0.4587

625 0.6943 0.6755 0.6849

1250 0.9816 0.9724 0.977

2500 1.4186 1.3492 1.3839

5000 2.0412 1.9262 1.9837

人IL-18參考標準曲線

注意 ：本圖僅供參考 ，應以同次試驗標準品所繪標準曲線計算標本含量 。

靈敏度 ，特異性和重複性:

1.靈敏度 ：多次重複結果表明，最小檢出量為35.8pg/ml 。上海尊龍凱時生物科技有限公司 www.ruianjituan.com

2.特異性 ：與人 IL- - - -18 sR ，小鼠 IL-18 ，大鼠 IL-18 等沒有交叉反應 。

3.重複性 ：板內 ，板間變異係數均<10%.

參考文獻:

1) Alsaleh, G., et al., J. Immunol. 182, 5088-5097 (2009)

2) Tada, H., et al., Infect. Immunol. 73, 7967-7976 (2005)

3) Rouabhia, M., et al., Infect. Immunol. 75, 3739-3746 (2002)

4) Vujisic, S., et al., Hum. Reprod. 21, 2650-2655 (2006)

5) Narita, M., et al., Clin. Diagn. Lab. 7, 909-914 (2000)

6) P arikh, C. R., et al., J. Am. Soc. Nephrol. 16, 3046-3052 (2005)

7) Baratin, M. L., et al., PNAS. 102, 14747-14752 (2005)

8) Kaizu, M., et al., Virology 313, 8-12 (2003)上海尊龍凱時生物科技有限公司 www.ruianjituan.com

ELISA Kit for the Quantitative Analysis of Human IL-18

The human IL-18 ELISA (enzyme-linked immunosorbent assay) kit is used for detection of human IL-18 in cell culture

supernatants,human serum and plasma.THE ELISA KIT IS FOR RESEARCH USE ONLY. Please read this instruction manual carefully

and check out the material provided before use, and you can contact with our company if any questions. You can enter our website or call

us for other aim.

Introduction

Interleukin 18 (IL-18) is an 18 kDa cytokine, structurally similar to IL-1, with great effects on T-cell activation. The precursor of IL- 18

is lacking a signal peptide and the mature molecule is formed by IL-1 beta-converting enzyme (ICE, caspase-1) cleaved the precursor.

It has been reported that IL-18 is produced from dendritic cells, activated macrophages, Kupffer cells, keratinocytes, intestinal

epithelial cells, osteoblasts and adrenal cortex cells. Human keratinocytes have been found to be the major producers of IL-18.

IL-18 acts on T helper 1-type (Th1) cells, and in combination with IL-12 strongly induces production of IFN-γ by these cells.

Pleiotropic effects of IL-18 have also been reported, including enhancement production of IFN-γ and GM-CSF in peripheral blood

mononuclear cells, production of Th1 cytokines, IL-2, GM-CSF and IFN-γ in T cells, enhancement of Fas ligand expression by Th1 cells.

Further more,an important role of IL-18 has been shown in clinical implications, in the role of IL-18 modulation in tumours, infections, and

autoimmune and inflammatory diseases.

Principles of the Test

The kits is a solid sandwich enzyme-linked immunosorbent assay for detection of human IL-18. An anti-human IL-18 monoclonal

antibody has been absorbed onto the wells of the microtiter strips provided. Samples including specimens or standards and human IL-18

biotin-conjugated antibody were pipetted into wells. The different epitope of human IL-18 would be captured by the coated antibody and

the biotin-conjugated antibody, which formed a sandwich. Free protein or antibody would be removed during a wash step.

Streptavidin-HRP would be added and binds to the biotin conjugated antibody, then free Streptavidin-HRP would be removed during a

wash step. After this, subtrate solution would be added and catalyzed by the HRP, and a coloured product is formed. The intensity of the

colored product is used to calculate in proportion to the amount of human IL-18 in the original specimen.

Materials provided with the kits:

reagent 96/48Test Kit

Assay Buffer 5ml/3 ml

IL-18 Antibody-Coated Wells 12 strips/6 strips

Standard Diluent 10 ml/5ml

IL-18 Standard 4/2vial(s)

Detetion Antibody 5ml/2.5ml

5000╳Streptavidin-HRP 2.2μ L /1.1μ L

HRP Dilute 11ml/5.5ml

Wash Buffer Concentrate 20× 30ml/15ml

TMB 10ml/5 ml

Stop Solution 5ml/3 ml

Plate Covers 3/2

Complete Instruction Manual 1Specimen Collection

1.Collecting specimen as following:

A.The particulate of the cell culture supernatants should be removed before use.

B.Serum was obtained from clot at room temperature.

C.Please collect plasma with EDTA.

D.Assay immediately or store samples at －20℃. Avoid free-thaw cycles.

2．Antiseptic and anticoagulant should not appear in Serum samples.

3.Any particulate should be removed from samples before use.

4. Do not use grossly hemolyzed or lipemic samples.

Note: Strongly recommend that the serum and plasma samples should be diluent as doubling dilution before use.

Precautions for use:

1.Please storage the Kit at 2～8℃ 。

2. Washing buffer concentrate may have crystal in low temperature, and you can melt its in water-bath before use.

3. Please discard the dissolved standard after 3 days for use.

4 、Avoid contact of substrate solution with oxidizing agents and metal.

5 、Usage of disposable pipette tips avoid microbial contamination or cross-contamination of reagents or specimens.

6. Do not mix or substitute reagents with those from other lots or other sources.

7. To ensure the adequate mixure of added reagents, please tap gently the plate after the wells were filled with liquid.

8. Incubation temperature should be 25～28℃.

9. Wash step was crucial for whole assay process.

10. Duplicate wells of the same sample were recommended in assay process.

11. Avoid the foam while pour the liquid into wells.

12 、For serum or plasma samples ,the biotin-conjugated antibody should be incubate for at least 90 minutes.

Reagent Preparation

1.The reagents should be warmed up to room temperature before use. The remanent reagents must reseal and put into refrigeratory

again as soon as possible.

2.Dilute 1ml of wash buffer Concentrate into 19ml deionized or distilled water to work.

3. If you have a 5x standard diluent, please dilute it with double steaming water or deionized water.

4. Add standard diluent to the bottle according to the volume of the label and wait 15 minutes for complete dissolution. And in turn add the

half concentration diluent by standard diluent .

Wash step:

Automated microplate washer or operating by pipette: Each well should be pour into300ul wash buffer and soak 15 or 30 seconds,then

be aspirated, five times process were repeated. After the last wash, remove remaining wash buffer by aspirating.Invert the plate and blot

it against clean paper towels.

Materials Required But Not Provided

1. pipettes and pipette tips

2. Microwell strip reader capable of reading at 450 nm (540 nm as optional reference wave length)

3. automated microplate washer

4.Glass-distilled or deionized water

Assay procedure

1.The needed strips were putted into the frame, the remains were returned into foil pouch and resealed.

2.Blank well were recommended, which only color reagent and stop solution be added. It is suggested that each testing with gradient

density of standard for standard curve.

3.Add 100ul of standard or sample. If assay the serum sample,you should add 50μ l assay buffer with 50μ l sample into the wells,if the

protein concentration is higher than the range of the Kit, add the same quantitys assay buffer with the sample, the deficiency should be

complemented with sample diluent to 100μ l per well..

4.Add 50ul of detetion antibody. Cover with the Plate Covers provided.Incubate for 2 hours at room temperature.

5.Five times wash process were repeated.

6.Add 100ul of Streptavidin-HRP. Cover with the Plate Covers provided. Lucifugal incubation for 30 minutes at room temperature.

7.Five times wash process were repeated.

8.Add 100ul of TMB，Lucifugal incubation for 20 minutes at room temperature.

9.Add 50ul of stop solution to each well, determine the optical density of each well within 10 minutes.

Calculation of Results

1.Duplicates should be within 20 per cent of the mean. Average absorbance values for each set of duplicate samples were used as

detection results.

2.The blank absorbance values of subtract should be deducted.

3.Drawing a best fit curve through the points of graph. Draw the standard curve by plotting assayed OD valure (on the Y axis) vs.

concentration (on the X axis). The sample concentration was obtained based on its OD value founding in the standard concentration

curve.

4.If the values obtained are not within the expected range of the standard, Samples should be dilute and assay again.

Typical Data and Standard Curve

concentration

(pg/ml)

Typical data 1 Typical data 2 Average

0 0.1491 0.1151 0.1321

156.25 0.3517 0.2965 0.3241

312.5 0.4672 0.4502 0.4587

625 0.6943 0.6755 0.6849

1250 0.9816 0.9724 0.977

2500 1.4186 1.3492 1.3839

5000 2.0412 1.9262 1.9837

Human IL-18 standard curve上海尊龍凱時生物科技有限公司 www.ruianjituan.com

Sensitivity, Specificity, Repeatability

Sensitivity: repeated assays were evalsuated and the minimum detectable dose was 35.8pg/ml.

Specificity : No significant cross-reactivity or interference with humanIL- - - -18 sR and

mouse IL-18,rat IL-18

Repeatability: The coefficient of variation between wells or plates is less than 10 percent.

REFERENCES

1) Alsaleh, G., et al., J. Immunol. 182, 5088-5097 (2009)

2) Tada, H., et al., Infect. Immunol. 73, 7967-7976 (2005)

3) Rouabhia, M., et al., Infect. Immunol. 75, 3739-3746 (2002)

4) Vujisic, S., et al., Hum. Reprod. 21, 2650-2655 (2006)

5) Narita, M., et al., Clin. Diagn. Lab. 7, 909-914 (2000)

6) P arikh, C. R., et al., J. Am. Soc. Nephrol. 16, 3046-3052 (2005)

7) Baratin, M. L., et al., PNAS. 102, 14747-14752 (2005)

8) Kaizu, M., et al., Virology 313, 8-12 (2003)