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Gm Pigs Xenotransplantation

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Gm Pigs Xenotransplantation
The possible role of genetically modified pigs in xenotransplantation.

Table of contents

Abstract. …......................................................................................................... Page. 4

2. Introduction. ..................................................................................................... 5-7

3. The possibilities for creating genetically modified pig donor organs.

3.1. The genetic modification of pigs for the purpose of xenotranplantation. ........ 8

4. Review of techniques used by researchers to genetically modify pigs for the purpose of xenotransplantation. ............................................................................................... 4.1. Sperm mediated gene transfer ............................................................ 9 4.2. Somatic cell nuclear transfer ............................................................ 10

5. Overcoming the immunological barriers to xenotransplantation.
5.1. Hyperacute rejection ….................................................................................. 11-12
5.2 Acute humoral xenograft rejection …............................................................ 13-14

6. Risk assessment – Possibility of porcine endogenous retrovirus crossing the pig to human species barrier.
6.1. The possible risk of xenotic infection............................................................. 15-16
6.2. Strategies to minimize xenotic infection. ....................................................... 17

7. Communicating the possible risk of transmissible xenotic disease to the public.

7.1. Communication, and the methods of communicating risk. ............................ 18



References: 1.Toledo-Pereyra L, Toledo A. 1954. Journal of Investigative Surgery, 2005, 18, p.285-290. 2. Brink, J.G, Hassoulas, J The first human heart transplant and further advances in cardiac transplantation at Groote Schuur Hospital and the University of Cape Town, Cardiovascular Journal of Africa, 2009, 20 p.30-40. 3. Groth, C.G, Forty years of liver transplantation : Personal reflections, Transplantation Proceedings, 2008, 40, p.1127-1129, 4 6. Diamond, LE, Quinn, CM, Martin, MJ, Lawson, J, Platt, JL, Logan JS, A human CD46 transgenic pig model system for the study of discordant xenotransplantation, Transplantation, 2001, 21 , p.132-142. 11. Cozzi, E, Bhatti, F, Schmoeckel, M, et.al, Long-term survival of non human primates receiving life-supporting transgenic porcine kidney xenografts, Transplantation, 2000, 70, p.15-21. 13. Lavitrano, M, Forni, M, Bacci, M, DiI Stefano, C, Varzi, V, Wang, H, Seren, E, Sperm Mediated Gene Transfer in Pig: Selection of Donor Boars and Optimization of DNA Uptake, Molecular Reproduction and Development, 2003, 64 p. 284–291. 14. Patience, C, Takeuchi, Y, Weiss RA, Infection of human cells by endogenous retrovirus of pigs, Nature Medicine, 1997, 3, p. 282 – 286. 15. Ramsoondar, J, Vaught, T, Ball, et.al, Production of transgenic pigs that express porcine endogenous retrovirus small interfering RNA`s. Xenotransplantation, 2009, 16, p.164-180. 16. Sprangers, B, Waer, M, Billiau. AD, Xenotransplantation: Where are we in 2008 ?, Kidney International, 2008, 74, p.14-21. 17. Klymiuk, N, Aigner, B, Brem, G, Wolf, E, Genetic modification of Pigs as Organ Donors for Xenotransplantation, Molecular Reproduction & Development, 2010, 77 p.209-221. 18. Candinas, D, Adams, D.H, Xenotransplantation: postponed by a millenium ?, QJM An International Journal of Medicine, 2000, 93, p. 63-66. 19. Pierson, RN III, Dorling,A, Ayares, D, Rees, MA, Seebach, JD, Fishman, JA, Hering, BJ, Cooper, DKC, Current status of xenotransplantation and prospects for clinical application. Xenotransplantation, 2009, 16, p.263-280. 20. Baxter, J , Thomas, J, Bard, D, Brockbank, B, Topic 6, Genetic Manipulation, 2007, S 250 Science in Context, Open University, Milton Keynes, UK. Ch. 6.2., p.122 -126. 21. Sach, DH, Cesare Galli, DVM, Genetic Manipulation of pigs, Current opinion Organ Transplantation, 2009, 14, p. 148-153 22 23. Sparrow, R, Xenotransplantation, Consent and International Justice, Developing World Bioethics, 2009, 9, p. 119-127. 24. De Bruin, WB, Guvenc, U, Fischoff, B, Armstrong, C, Caruso, D, Communcating About Xenotransplantation: Models and Scenarios, Risk Analysis, 2009, 29, p. 1105-1115. 25. Cook, PS, Informed Consent and Human Rights: Some Regulatory Challenges of Xenotransplantation, Social Alternatives, 2007, 26, p. 29-34. 26. Bach, F. H. and Ivinson, A. J, 'A shrewd and ethical approach to xenotransplantation ', Trends in Biotechnology, 2002, 20, p.129-31. 27. Moscoso I, Hermida-Prieto M, Manez R, et al, Lack of cross-species transmission of porcine endogenous retrovirus in pig-to-baboon xenotransplantation with sustained depletion of anti-alphagal antibodies. Transplantation, 2005, 79, p.777-82. 28 Ramsoondar, J, Vaught, T, Ball, et.al, Production of transgenic pigs that express porcine endogenous retrovirus small interfering RNA`s. Xenotransplantation, 2009, 16, p.164-180. 29. Matthews, AL, Brown, J, Switzer, W, Folks, TM, Heneine, W, Sandstrom, PA, Development and validation of a western immunoblot assay for detection of antibodies to porcine endogenous retrovirus. Transplantation, 1999, 67, p. 939-943. 30. Miller, D. Mediating science: promotional strategies, media coverage, public belief and decision making. In Scanlon, E., Whitelegg, E. and Yates, S. (eds), Communicating Science: contexts and channels, 2009, Routledge, London, pp.206-26 31 32. Ellison, T, Xenotransplantation-Ethics and Regulation, Xenotransplantation, 2006, 13, p.505-509 33 34. Hagelin, J, Public opinion surveys about xenotransplantation, Xenotransplantation, 2004, 11, p.551-558. 36. Smetanka, C, Cooper, DKC, The ethics debate in relation to xenotransplantation, Revue Scientifique et Technique - Office International, 2005, 24[1] p.335-342

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