GalT-KO Pigs Expressing Primate CD47 to Facilitate Organ Xenografts

Award Information
Agency: Department of Health and Human Services
Branch: N/A
Contract: 1R41AI082853-01A1
Agency Tracking Number: R41AI082853
Amount: $592,083.00
Phase: Phase I
Program: STTR
Awards Year: 2010
Solicitation Year: 2010
Solicitation Topic Code: NIAID
Solicitation Number: PHS2010-2
Small Business Information
DUNS: 555636117
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 (608) 437-1902
Business Contact
Phone: (617) 954-9660
Research Institution
 Massachusetts General Hospital
 Partners Research Management
BOSTON, MA, 02199-
 () -
 Domestic nonprofit research organization
DESCRIPTION (provided by applicant): Xenotransplantation with pig organs offers the best near term hope for satisfying the limitation imposed by shortage of human organs. Although hyperacute rejection of pig organs in primate recipients has been overcome by the production of (-1,3-galactosyltransferase knockout (GalT-KO) pigs, experiments to date with GalT-KO organs strongly suggest that clinically relevant chronic immunosuppression of recipients will be insufficient to overcome rejection of xenotransplants. Tolerance induction through hematopoietic chimerism, which has recently been shown clinically to allow human allograft acceptance without chronic immunosuppression could potentially play a key role in allowing acceptance of xenogeneic organs as well. Our proposed product will consist of genetically modified pigs with enhanced xenogeneic hematopoietic chimerism potential that we will make available commercially to the research community, thereby providing a strategy for advancing solid organ xenotransplantation toward the clinic. Recent evidence suggests that a key barrier to the establishment of chimerism following pig-to-primate bone marrow transplantation is species incompatibility of the CD47 (IAP, integrin associated protein) cell surface molecule. Ubiquitously expressed, CD47 binds SIRP( receptors on macrophages and thereby inhibits phagocytosis. Expression of primate CD47 on pig cells greatly reduces their susceptibility to phagocytosis by human macrophages. The goal of Phase I of this STTR proposal is to develop and verify the tools necessary for production, via nuclear transfer, of pigs expressing primate CD47 on a GalT-KO background. This includes development of targeting/expression vectors for CD47, development of molecular assays for identifying targeted cell clones, verification of a primary cell clone isolation process and isolation of primary fetal fibroblast lines for use in the production of CD47 transgenic pigs. In Phase II, we will use these tools to produce GalT-KO pigs expressing primate CD47 via nuclear transfer, analyze CD47 expression in these pigs, evaluate the efficacy of CD47 expression using in vitro systems, and perform a limited number of proof-of-concept transplant experiments. PUBLIC HEALTH RELEVANCE: The demand for transplantable human organs far exceeds the current supply and the gap between demand and supply continues to grow. Transplantation of pig hearts, kidneys and other organs offers the opportunity to greatly reduce or eliminate this shortage. The overall goal of this project is to produce genetically modified pigs as a commercial product that will further the development of pig-to-human organ transplantation.

* information listed above is at the time of submission.

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