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兔单抗亲和力和灵敏度更高
相对于鼠单抗（解离常数Kd在10-9-10-10M水平），兔单抗的亲和力可提高100-1000倍（Kd在10-10-10-12M水平）。实际使用时，兔单抗的工作浓度更低，灵敏度更高，因此产生的背景更低，大大降低了假阳性的发生。用作免疫组化等用途时，有时甚至可免去抗原修复的步骤。
兔单抗能识别更多表位
很多蛋白在人类和啮齿动物中同源性很高，这些保守表位在小鼠体内免疫原性很弱，不容易产生高质量抗体。而兔做为宿主，可以更好地识别这些表位，产生针对更多表位的抗体。当然，兔也适合生产针对鼠类蛋白的抗体。
细胞融合实验方案
Fusion is an important procedure to produce monoclonal antibodies (MoAb).
一、Protocol
1、prepare the culture of myeloma cells and maintain the concentration of the cells at the level of less than 106 cells/ml (IMDM 10% FCS/FBS). Just before the fusion wash 3 times in IMDM (serum free), 1200 rpm, 5min, 37℃. Count cells.
2、sacrifice the mouse and dissect the spleen.
3、tease the spleen in ice-cold IMDM (serum free!); pass through the nylon filter; wash 3 times in IMDM (serum free!), 1200 rpm, 5min, 37℃. Count cells.
4、mix 108 spleen cells (in 25 ml of IMDM [serum free]) with 2x107 myeloma cells (in 25 ml of IMDM [serum free]) in Falcon-50 ml conical tube.
5、centrifuge at 1200 rpm, 5 min, 37℃.
6、aspirate the supernatant (SN) with a Pasteur pipette (all till the last drop!!!)
7、gently break the pellet by tapping of the bottom of the tube.
8、place the tube on 37℃ water bath; add slowly, dop by drop 1 ml of pre-warmed (37℃) 50% PEG 1500 (polyethylene glycol, Roche, Germany) continously stirring the cells with the pipette tip (this procedure lasts for a period over 1 min)
9、add 1 ml of pre-warmed to 37℃ IMDM continously stirring the mixture (this procedure lasts for a period over 1 min).
10、add 3 ml of pre-warmed to 37℃ IMDM continously stirring the mixture (this procedure lasts for a period over 3 min).
11、add 10 ml of pre-warmed to 37℃ IMDM continously stirring the mixture (this procedure lasts for a period over 1-2 min).
12、let to stay for 5 min on the 37℃ water bath.
13、centrifuge at 1200 rpm, 5 min, 37℃; aspirate the SN.
14、resuspend the cells in IMDM-FCS(10%v/v) - HTx100 (1%v/v) - AJ(5%v/v) - IL-6, 0.5x106 cells/ml (calculation figured out from the number of spleen cells the fusion was started from); let to stay in incubator, 37℃, pCO2 7% for 2 hours in a big flasc.
15、add aminopterin; distribute on 96-wells cell culture plates (Nunc) (200μl/well); place in incubator (37℃, pCO2 7%) enveloped in aluminium paper.
16、check the cultures 1-2-7 days after the fusion.
17、on day 7-10 change the culture medium.
18、test clones when thay occupy 25% of the bottom surface of the well.
二、SOLUTIONS
1、IMDM (Iscove's Modified Dulbecco's Medium with 25 mM Hepes/with L-Glutamine) BioWhittaker Europe Cat.: BE12-722F
2、IMDM-FCS(10%v/v)-HTx100(1%v/v)-AJ(5%v/v)-IL-6 (100 U/ml)
3、IMDM - FCS(10%v/v) - HTx100(1%v/v) - AJ(5%v/v) - IL 6 (100 U/ml) - aminopterine x100 (1% v/v)
4、HT (hypoxantine-thymidine)x100, 0.22 (or 0.45) μm-filtered, store at -20℃= hypoxantine solution, 50 ml thymidine solution, 50 ml ddH2O up to 250 ml
5、hypoxantine solution = hypoxantine, 340 mg ddH2O up to 50 ml NaOH 1 N, 3 ml - heat to 37℃
6、thymidine solution = thymidine (2'-desoxy-thymidine), 96 mg ddH2O up to 50 ml
7、AJ (from "ajouter" , to add, local slang), 3 L, 0.22 (or 0.45) μm-filtered, store at -20℃= Asp-Arg x100, 1 L Gluta x 50, 2 L mercaptoethanol, 350 μl
8、Asp-Arg x100, 1 L, pH 6.0 = L-Asparagine, 3.6 g (0.24 mM) L-Arginine (0.55 mM), 11.6 g HCl, 0.5N, 100 ml -heat to 37C, add ddH2O up to 1 L
9、Gluta x50, 1 L, pH 6.0 = glutamine, 10.8 g (1.48 mM) HCl, 0.5N, 100 ml -> heat to 37℃, add ddH2O up to 1 L
10、aminopterine x100, 0.22-0.45 μm-filtered, store at -20℃ = aminopterine, 4.4 mg (3.8??M) ddH2O, 50 ml NaOH, 1N, 100μl-> heat to 37℃, add ddH2O up to 250 ml
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