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 JoVE Immunology and Infection

IgY Technology: Extraction of Chicken Antibodies from Egg Yolk by Polyethylene Glycol (PEG) Precipitation

1, 2, 3, 4, 5

1Center for Biological Security, Robert Koch-Institute, 2CICVyA - INTA Castelar, Instituto de Virología, 3Center of Molecular Immunology, Ciudad de la Habana, Cuba, 4Department of Biology, Chemistry, Pharmacy, Institute of Biology-Neurobiology, Free University of Berlin, 5Institut of Pharmacology, Charité-University Medicine of Berlin

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    Summary

    This protocol describes in particular the extraction of total IgY from egg yolk by means of polyethylene glycol precipitation and gives general information about IgY technology.

    Date Published: 5/01/2011, Issue 51; doi: 10.3791/3084

    Cite this Article

    Pauly, D., Chacana, P. A., Calzado, E. G., Brembs, B., Schade, R. IgY Technology: Extraction of Chicken Antibodies from Egg Yolk by Polyethylene Glycol (PEG) Precipitation. J. Vis. Exp. (51), e3084, doi:10.3791/3084 (2011).

    Abstract

    Hens can be immunized by means of i.m. vaccination (Musculus pectoralis, left and right, injection volume 0.5-1.0 ml) or by means of Gene-Gun plasmid-immunization. Dependent on the immunogenicity of the antigen, high antibody-titres (up to 1:100,000 - 1:1,000,000) can be achieved after only one or 3 - 4 boost immunizations. Normally, a hen lays eggs continuously for about 72 weeks, thereafter the laying capacity decreases. This protocol describes the extraction of total IgY from egg yolk by means of a precipitation procedure (PEG. Polson et al. 1980). The method involves two important steps. The first one is the removal of lipids and the second is the precipitation of total IgY from the supernatant of step one. After dialysis against a buffer (normally PBS) the IgY-extract can be stored at -20°C for more than a year. The purity of the extract is around 80 %, the total IgY per egg varies from 40-80 mg, dependent on the age of the laying hen. The total IgY content increases with the age of the hen from around 40 mg/egg up to 80 mg/egg (concerning PEG precipitation). The laying capacity of a hen per year is around 325 eggs. That means a total potential harvest of 20 g total IgY/year based on a mean IgY content of 60 mg total IgY/egg (see Table 1).

    Protocol

    1. Protocol - IgY-extraction by means of PEG-precipitation

    Fig. 1 gives a schematic diagram of the IgY-extraction procedure (see Table 2). The protocol was first described in Polson et al. 1980.
    All steps should be performed using latex gloves.

    1. The eggshell is carefully cracked and the yolk is transferred to a "yolk spoon" in order to remove as much egg white as possible.
    2. The yolk is transferred to a filter paper and rolled to remove remaining egg white, then the yolk skin is cut with a lancet or a similar instrument (pipette tip). The yolk is poured into a 50 ml tube and the egg volume is registered (V1).
    3. Twice the egg yolk volume of PBS is mixed with the yolk (∑V1+V2), thereafter 3.5 % PEG 6000 (in gram, pulverized) of the total volume is added and vortexed, followed by 10 min rolling on a rolling mixer. That step of the extraction procedure separates the suspension in two phases. One phase consists of "yolk solids and fatty substances" (original quotation of Polson et al. 1980) and a watery phase containing IgY and other proteins.
    4. The tubes are centrifuged at 4°C for 20 min (10,000 rpm according to 13,000 x g, Heraeus Multifuge 3SR+, fixed angle rotor). The supernatant (V3) is poured through a folded filter and transferred to a new tube.
    5. 8.5 % PEG 6000 in gram (calculated according to the new volume) are added to the tube, vortexed and rolled on a rolling mixer as in step 3.
    6. Repeat step 4 with the difference that the supernatant is discarded.
    7. The pellet is carefully dissolved in 1 ml PBS by means of a glass stick and the vortexer. PBS is added to a final volume of 10 ml (V4). The solution is mixed with 12 % PEG 6000 (w/v, 1.2 gram) and treated as in step 3 (vortex, rolling mixer).
    8. Repeat step 6 and dissolve the pellet carefully in 800 μl PBS (glass stick and vortex). Wait for the air bubbles to disappear and then transfer (pipette) the extract to a dialysis capsule. Rinse the tube with 400 μl PBS and add the volume to the dialysis device (V5). (For preparation of dialysis devices and membranes see appendix.)
    9. The extract is dialysed over night in 0.1 % saline (1,600 ml) and gently stirred by means of a magnetic stirrer. The next morning, the saline is replaced by PBS and dialysed for another three hours.
    10. Thereafter the IgY-extract is pulled from the dialysis capsule by a pipette and transferred to 2ml tubes. The final volume is around 2 ml (V6).
    11. The protein content (mg/mL) of the samples is measured photometrically at 280 nm (1:50 diluted with PBS) and calculated according to the Lambert-Beer law with an extinction coefficient of 1.33 for IgY (see Fig. 2), Fig. 4 shows the quality of the preparation (purity and recovery are around 80 %).
    12. It is advisable to store the samples in aliquots at -20°C (do not freeze the samples at -70°C).
    13. The quality of the final preparations is analysed by simple SDS-PAGE as described in JoVE protocol http://www.jove.com/details.php?id=1916

    2. Appendix- before use the dialysis bag must be prepared in the following way according to the recommendations of the manufacturer:

    1. 20 dialysis bags are cut in pieces of 30 cm and given in a 2000 ml glass beaker.
    2. 1,750 ml of a 5 mM EDTA-solution are added.
    3. A glass funnel is placed above the bags to ensure that the bags are covered by the EDTA solution. The solution is heated and boiled for 5 min (hot plate). The solution is decanted and the bags are washed three times with distilled water.
    4. Once again 1,750 ml EDTA-solution are added, boiled for 5 min and washed three times with distilled water as above.
    5. Finally the dialysis bags are boiled for 10 min in distilled water and stored at 4°C. Take out the dialysis bags by means of sterilized tweezers.

    3. Representative results

    Figure 1
    Figure 1. Schematic diagram of IgY-extraction by means of polyethylene glycol precipitation according to the original description of Polson et al. 1980. To view a larger image click here.

    Figure 2
    Figure 2. Development of total-IgY in egg yolk of immunised hens in dependence of age. Given is the weekly mean of total IgY/egg and SD (n = 4 laying hens). From [Pauly et al. 2009]).

    Figure 3
    Figure 3. Laying capacity monitoring of four hens immunised with different antigens. The arrows indicate immunisation date (from [Pauly et al. 2009]).To view a larger image click here.

    Figure 4
    Figure 4. Polyacrylamide-Gelelectrophoresis of individual IgY preparations from different eggs under reducing conditions
    Lane 1 - Molecular weight marker, Lane 2 - IgY-standard, Lane 3-5 - different IgY samples prepared as described in the protocol. These are final preparations according to step 10 of the protocol. HC - heavy chains, LC - light chaines, ? - minor impurities corresponding to molecular weight around 35 kDa (probably the C-terminal fragment of vitellogenin II precursor, [Klimentzou et al., 2006]).

      Chicken 21 (Antigen A) Chicken 22 (Antigen A) Chicken 19 (Antigen B) Chicken 23 (Antigen C)
    Egg number (total IgY)1, 2-years period 625 (38 g) 626 (38 g) 545 (33 g) 608 (37 g)
    Egg number (total IgY), first year 345 (20 g) 304 (16 g) 326 (18 g) 308 (17 g)
    Egg number (total IgY), second year 280 (18 g) 322 (21 g) 219 (15 g) 300 (20 g)
    % of max. possible egg number (first year)2 106 93 100 95
    % of max. possible egg number (second year) 86 99 67 92
    number of processed eggs 565 620 283 401

    1The amount of total IgY is calculated by multiplying the number of eggs by a mean value of 60 mg protein per egg according to the data of Figure 2.

    2The max. possible egg number per year is 325 according to an information of the breeder.

    Table 1. Two years statistics of egg laying capacity of chickens immunized with different antigens. Laying capacity in percent of the maximum of four hens after immunisation with different antigens as well as the IgY-outcome during two years (see also Fig. 3), [Pauly et al. 2009]).

    Egg Nr. Hen Nr. Laying Date V1[ml] yolk V2[ml] PBS 1. PEG prec. [g] Vol [ml] after 2. PEG prec. [g] Pellet 3. PEG prec. [g] Pellet Vol [ml] Total protein mg/ml Corrected total protein mg/ml
          2xV1 ∑V1 + V2 3,5% [w/v] ∑V1 + V2 prec., centrif. and filtration V3 8,5% [w/v] V3 dissolved in ml PBS V4 12% [w/v] V4 Dissolved in ml PBS V5 After dialysis against PBS V6 A280/ml A280/ml:1.33
    1 H293 / 22.10. 15 30 45 1.58 31 2.63 10 1.2 1.2 1.7 35.0 26.3
    2 H293 / 23.10. 13 26 39 1.37 25 2.12 10 1.2 1.2 1.7 28.8 21.6

    Table 2. Exemplary protocol of PEG precipitation

    Discussion

    The choice of a suitable IgY purification method is influenced by scale of purification (laboratory or industrial), cost effectiveness, technology (laboratory equipment), and impact on the environment (waste management). Various IgY extraction methods were reviewed in detail by De Meulenaer & Huyghebaert (2001, for review see also Schade et al. 2005). In general, these methods can be divided into three principal groups:

    1. Precipitation methods: involving ammonium or sodium sulphate, polyethyleneglycol (PEG), caprylic acid and caragenean.
    2. Chromatographic methods: affinity chromatography, ion exchange chromatography, hydrophobic interaction chromatography, thiophylic interaction chromatography, and gel-filtration chromatography.
    3. Ultrafiltration.

    The purity of an IgY preparation can be increased by a combination of methods; for example, PEG precipitation can be combined with affinity chromatography. In some instances, depending on the final application, a water extract of IgY is sufficient to achieve good results (Akita & Nakai 1993). According to our experience, the IgY-sample we obtain by PEG-precipitation worked very well in a lot of different immunological assays. By standardizing the PEG-precipitation method one technical assistant is able to process approximately 84 eggs per week, which corresponds to an amount of total IgY between 4 and 7 g per week. A simple calculation: A laying hen is immunised with an antigen. After a few boost immunisations the hen produces specific antibodies (Ab) with a titre of 1:50,000 during a period of 30 days. 30 eggs x 2 ml IgY extract (see protocol and Fig. 3) corresponds to 60 ml total IgY, which in turn corresponds to an Ab-dilution of 3,000 l (the capacity of a bucket is 10 l), that means with 3,000 l of Ab solution 300 buckets can be filled. So, in view of such huge Ab-quantity it is no problem to store an Ab-pool of constant quality and specificity. This technique reduces the charge/lot variability otherwise observed in polyspecific Ab.

    Despite of the aspect of quantity, IgY Ab have further advantages compared with mammalian IgG: No activation of mammalian complement system, no cross-reactivity with HAMA (human anti mouse antibody), rheumatoid factors or human blood group antigens (lack of heteroagglutinins).

    An outstanding advantage of IgY-Ab is the so-called phylogenetic distance. Phylogenetic distance is the reason for the frequently described differences between the Ab specificities of mammals and chickens, even when identically immunised. In addition to differences between the mammalian and the avian immune system themselves, differences in phylogenetic development in these two animal classes contributes to the different Ab specificities. Several authors have reported that chickens often produce Abs against phylogenetically highly conserved mammalian proteins or peptides more efficiently than do rabbits (for review see Schade et a. 2005). As a consequence, a conserved antigen can remain"masked" to the rabbit immune system, and thus cause only a weak or a"silent" response. Furthermore, if chickens and rabbits are immunised with the same mammalian antigen, very often the chickens respond with an Ab-specificity that can rarely be achieved in rabbits. Also the aspect of animal welfare is important since the Ab are non-invasively extracted from egg yolk. In combination with Gene-Gun (plasmid) immunisation the IgY-production is completely non-invasive (Witkowski et al. 2009).

    In conclusion, the production of Ab in hens and the IgY-extraction by means of PEG-precipitation is very cost-effective and results in highly specific Ab with stable titres up to 1:1,000,000. Due to the phylogenetic distance between Aves and Mammalia, chicken are able to produce specific Ab against highly conserved mammalian antigens in contrast to e.g. rabbits. The extraordinary amount of Ab obtained by IgY-technology opens the door also for using IgY-Ab in human- and veterinary medicine for therapeutic/prophylactic purposes.

    Disclosures

    Experiments on animals were performed in accordance with the guidelines and regulations set forth by Landesamt fur Gesundheit und Soziales Berlin (H 0069/03).

    Acknowledgements

    This work was supported by a grant from the German Federal Ministry of Education and Research (Project BiGRUDI [Biologische Gefahrenlagen: Risikobewertung, ultraschnelle Detektion und Identifizierung von bioterroristisch relevanten Agenzien, 13N9594]). We thank B. Diemar (Charité-Universitätsmedizin Berlin, Institut für Pharmakologie) for excellent technical assistance.

    Materials

    1. Dialyse Bag Visking, Type 27/32, cut off -14 kD, Carl Roth GmbH, Karlsruhe, Germany
    2. Falcon tubes Blue Max, 50 ml Polypropylene Conical Tube, Becton Dickinson Labware, Franklin Lakes NY, USA
    3. Folded Filter MN 615 ¼, 150 mm, Carl Roth GmbH, Karlsruhe, Germany Heraeus
    4. Magnetic stirrer, Variomag Mono, H+P Labortechnik AG, Oberschleißheim, Germany
    5. Micro-Dialyse-Capsule 5,0 ml, Carl Roth GmbH, Karlsruhe, Germany
    6. Multifuge 3SR+, Thermo Scientific, Langenselbold, Germany
    7. Photometer UV-160A, Shimadzu Deutschland GmbH, Duisburg, Germany
    8. Polyethylene Glycol 6000, Rotipuran Ph. Eur., Carl Roth GmbH, Karlsruhe, Germany
    9. Premixed PBS-Buffer 10x, Roche Diagnostics GmbH, Mannheim, Germany
    10. Roller Mixer SRT2, Stuart, Staffordshire, UK
    11. Vibrofix VF2, Janke & Kunkel, IKA-Labortechnik, Staufen i.Br., Germany
    12. Yolk spoon, Fackelmann (houshold effects), Germany

    References

    1. Akita, E.M. & Nakai, S. Comparison of four purification methods for the production of immunoglobulins from eggs laid by hens immunized with an enterotoxigenic E. coli strain. J. Immunol. Methods 160, 207-214 (1993).
    2. De Meulenaer, B. & Huyghebaert, A. Isolation and purification of chicken egg yolk immunoglobulins: a review. Food Agricult. Immunol.13, 275 - 288 (2001).
    3. Klimentzou, P., Paravatou-Petsotas, M., Zikos, Ch., Beck, A., Skopeliti, M., Czarnecki, J., Tsitsilonis, O., Voelter, W., Livaniou, E. & Evangelatos, G.P.. Development and immunochemical evaluation of antibodies Y for the poorly, immunogenic polypeptide prothymosin alpha. Peptides 27, 183-193 (2006).
    4. Pauly, D., Dorner, M., Zhang, X., Hlinak, A., Dorner, B. & Schade, R. Monitoring of laying capacity, immunoglobulin Y concentration, and antibody titer development in chickens immunized with ricin and botulinum toxins over a two-year period. Poultry Science 88, 281-290 (2009).
    5. Polson, A., von Wechmar, M.B & van Regenmortel, M.H. Isolation of viral IgY antibodies from yolks of immunized hens. Immunol. Commun. 9, 475-493 (1980).
    6. Schade, R., Behn, I., Erhard, M., Hlinak, A. & Staak C. Chicken egg yolk antibodies, production and application : IgY-Technology. Springer, Berlin. (2001).
    7. Schade, R., Calzado, E.G., Sarmiento, R., Chacana, P.A., Porankiewicz-Asplund, J. & Terzolo, H.R. Chicken egg yolk antibodies (IgY-technology): a review of progress in production and use in research and human and veterinary medicine. Altern. Lab Anim. 33, 129-154 (2005).
    8. Witkowski, P.T., Bourquain, D.R., Hohn, O., Schade, R. & Nitsche, A. Gene gun-supported DNA immunisation of chicken for straightforward production of poxvirus-specifiv IgY antibodies. J. Immunol. Methods 341, 146-153 (2009).

    Comments

    8 Comments

    Dear Dr Schade, congratulations by your presentation. I don't use PEG in IgY purification procedures, acctually we using water soluble fraction and sodium sulphate, because purifaction result also is good. Interesting, in PEG protocol a freezing and thawing step were not necessary, I think the time is not spent with that intermediary step. Did you have crystallized samples during any the centrifugation step?
    Best regards
    Alvaro, Brazil
    Reply

    Posted by: AnonymousJune 26, 2011, 10:17 PM

    Dear Dr. Ferreira,

    thank you for your interest. In answering your question, we indeed do not includ freezing/thawing cycles. We never have seen any crystallized samples during the centrifugation steps.

    With best regards
    R. Schade
    Reply

    Posted by: AnonymousJuly 7, 2011, 1:06 AM

    Dear Dr Schade,

    Yes this is a marvellous video.....We have some interst in IgYs against complex protein antigens and were intrigued that in your hands -70oC storage caused inactivation whilst -²0oC storage did not. What do you suspect were the reasons for this observation? Also, I hjave been wondering if you have tried to freeze-dry IgY preparations for long term strorage after your PEG diffrential precipitation methods?

    Cheers,
    Mark Baker, Sydney

    Reply

    Posted by: AnonymousAugust 9, 2011, 12:34 AM

    We can not explain the difference between -²0oC and -70oC concerning IgY inactivation but that observation is in accordance also with the experience of Swedish colleagues. Concerning freeze drying of IgY preparations see the paper of FU et al.

    J Virol Methods. ²006 Apr;133(1):11²-5. Epub ²005 Dec 1.
    Preparation and evaluation of anti-SARS coronavirus IgY from yolks of immunized SPF chickens.
    Fu CY, Huang H, Wang XM, Liu YG, Wang ZG, Cui SJ, Gao HL, Li Z, Li JP, Kong XG.

    Greetings R.Schade

    (Sorry, for posting it late.)
    Reply

    Posted by: AnonymousAugust 17, 2011, 8:19 AM

    Thanks Professor Schade. Lyophilisation appears to not adversely effect IgY activity. We will try this procedure and get back to you.
    Best
    Mark
    Reply

    Posted by: AnonymousAugust 18, 2011, 7:30 PM

    Dr. Schade:

    Could you please let me know the pore size of the Micro-Dialyse-Capsule?
    Thank you very much and I appreciate your help in advance.

    Best regards

    Dr. Tek



    Reply

    Posted by: AnonymousOctober 10, 2011, 2:53 PM

    Dear Dr. Schade,

    I appreciate your effort for publishing video for IgY extraction.
    I request you kindly give some more details about molar strength for PBS.
    Could you explain me about the dissolving pellet in 1ml PBS, then making up to
    10ml using same PBS solution and dissolving final pellet in 800μl PBS for more than one egg?
    Reply

    Posted by: AnonymousOctober 28, 2011, 1:17 AM

    Respected sir,
    would you please let me know the range of pore sizes of dialysis bags used for IgY purification in the video. I would also like to know the purity of IgY in the extracted sample
    Respectfully
    Shankha
    Reply

    Posted by: AnonymousMarch 29, 2012, 6:55 AM

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