PapersFlow Research Brief
Xenotransplantation and immune response
Research Guide
What is Xenotransplantation and immune response?
Xenotransplantation and immune response refers to the transplantation of organs or tissues from pigs to humans and the immunological barriers, including xenograft rejection and porcine endogenous retroviruses, that challenge graft survival.
This field centers on using genetically modified pigs as organ donors for human transplantation to address organ shortages. Key challenges include the α-1,3-galactose residues on pig cells that trigger hyperacute rejection and risks from porcine endogenous retroviruses. There are 21,483 works in this cluster.
Topic Hierarchy
Research Sub-Topics
Genetic Engineering of Donor Pigs for Xenotransplantation
This subfield develops multi-transgenic pigs via CRISPR/Cas9 knocking out α-Gal epitopes and inserting human complement regulators, anticoagulants, and anti-inflammatory genes. Research optimizes homology-directed repair and evaluates phenotype stability across generations.
Porcine Endogenous Retroviruses in Xenotransplantation
Studies assess PERV transmission risks to human recipients, including infection efficiency in vitro, knockout strategies using CRISPR, and long-term monitoring in preclinical models. Investigations cover proviral load variation across pig breeds.
Immunological Barriers in Pig-to-Human Xenotransplantation
Researchers dissect antibody-mediated rejection via non-Gal xenoantibodies, NK cell involvement, and innate immune activation in GTKO.hCD46 pig models. Focus includes endothelial cell activation and coagulopathy pathways.
Xenograft Rejection Mechanisms and Tolerance Induction
This area models acute and chronic rejection cascades, testing mixed chimerism, regulatory T cells, and costimulation blockade for operational tolerance. Preclinical nonhuman primate studies validate human-relevant outcomes.
Clinical Trials in Pig-to-Human Xenotransplantation
Investigations report outcomes from compassionate kidney and heart xenotransplants, monitoring graft function, infection risks, and immune responses post-mortem. Ethical frameworks and regulatory pathways are also refined.
Why It Matters
Xenotransplantation addresses the critical shortage of human donor organs by using pig organs, with genetic modifications enabling initial graft survival. Lai et al. (2002) produced α-1,3-galactosyltransferase knockout pigs by nuclear transfer cloning, removing a major immunological barrier responsible for hyperacute rejection in pig-to-human transplants. Patience et al. (1997) showed infection of human cells by porcine endogenous retroviruses, highlighting infection risks that must be mitigated for clinical application. Ito et al. (2002) developed NOD/SCID/γcnull mice as recipients for human cell engraftment, providing a model to study immune responses in xenotransplantation. These advances support potential clinical trials in surgery for end-stage organ failure.
Reading Guide
Where to Start
'Production of α-1,3-Galactosyltransferase Knockout Pigs by Nuclear Transfer Cloning' (2002) by Lai et al., as it directly explains the core genetic modification addressing the primary immune barrier in xenotransplantation.
Key Papers Explained
'Production of α-1,3-Galactosyltransferase Knockout Pigs by Nuclear Transfer Cloning' (Lai et al., 2002) establishes pigs lacking the α-Gal epitope, building on infection risks identified in 'Infection of human cells by an endogenous retrovirus of pigs' (Patience et al., 1997). Ito et al. (2002) in 'NOD/SCID/γcnull mouse: an excellent recipient mouse model for engraftment of human cells' provides a testing platform for these modified grafts. These papers connect genetic engineering, viral safety, and preclinical modeling.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Research continues on multi-gene edits in pigs to suppress innate and adaptive immune responses beyond α-Gal knockout, as implied in foundational works like Lai et al. (2002). No recent preprints available, so frontiers remain in refining models from Ito et al. (2002) for human trials.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Culture of Human Endothelial Cells Derived from Umbilical Vein... | 1973 | Journal of Clinical In... | 6.9K | ✓ |
| 2 | Measurement of Prostate-Specific Antigen in Serum as a Screeni... | 1991 | New England Journal of... | 2.4K | ✕ |
| 3 | Cancer/testis antigens, gametogenesis and cancer | 2005 | Nature reviews. Cancer | 1.6K | ✕ |
| 4 | NOD/SCID/γcnull mouse: an excellent recipient mouse model for ... | 2002 | Blood | 1.4K | ✕ |
| 5 | Immunogenetic Consequences of Vascular Anastomoses Between Bov... | 1945 | Science | 1.4K | ✕ |
| 6 | Production of α-1,3-Galactosyltransferase Knockout Pigs by Nuc... | 2002 | Science | 1.3K | ✕ |
| 7 | Histocompatibility Testing 1965 | 1966 | JAMA | 1.3K | ✕ |
| 8 | Prostate cancer in a transgenic mouse. | 1995 | Proceedings of the Nat... | 1.3K | ✓ |
| 9 | A role for CD95 ligand in preventing graft rejection | 1995 | Nature | 1.2K | ✕ |
| 10 | Infection of human cells by an endogenous retrovirus of pigs | 1997 | Nature Medicine | 1.2K | ✕ |
Frequently Asked Questions
What is the major carbohydrate barrier in pig-to-human xenotransplantation?
Galactose α-1,3-galactose residues on pig cell surfaces trigger hyperacute rejection. 'Production of α-1,3-Galactosyltransferase Knockout Pigs by Nuclear Transfer Cloning' (2002) produced four live pigs with one allele of the α-1,3-galactosyltransferase locus knocked out using nuclear transfer to eliminate this epitope.
How do porcine endogenous retroviruses affect xenotransplantation?
Porcine endogenous retroviruses can infect human cells, posing a transmission risk. 'Infection of human cells by an endogenous retrovirus of pigs' (1997) demonstrated this infection capability in human cell lines.
What mouse model is used to study xenotransplantation immune responses?
NOD/SCID/γcnull mice serve as excellent recipients for human cell engraftment due to combined severe combined immunodeficiency and interleukin-2Rγ mutations. Ito et al. (2002) generated these mice through backcross matings to model xenotransplantation.
What genetic modification targets xenograft rejection?
Knocking out the α-1,3-galactosyltransferase gene removes the galactose α-1,3-galactose antigen from pig cells. Lai et al. (2002) achieved this in live pigs via nuclear transfer cloning, producing animals suitable for transplantation studies.
What are key immunological barriers in xenotransplantation?
Immunological barriers include hyperacute rejection from α-Gal epitopes and potential viral transmission from porcine retroviruses. Papers like Lai et al. (2002) and Patience et al. (1997) identify these as primary obstacles to clinical pig-to-human transplantation.
Open Research Questions
- ? How can multiple alleles of α-1,3-galactosyltransferase be fully knocked out in pigs to prevent all α-Gal production?
- ? What strategies eliminate transmission risk from porcine endogenous retroviruses in human recipients?
- ? Which additional immune pathways beyond α-Gal cause chronic xenograft rejection?
- ? How do human immune cells respond to genetically modified pig organs in vivo?
- ? What combination of genetic edits in pigs optimizes long-term graft survival?
Recent Trends
The field has 21,483 works with no specified 5-year growth rate.
No recent preprints or news in the last 12 months indicate steady progress building on established papers like Lai et al. without new public breakthroughs.
2002Research Xenotransplantation and immune response with AI
PapersFlow provides specialized AI tools for Medicine researchers. Here are the most relevant for this topic:
Systematic Review
AI-powered evidence synthesis with documented search strategies
AI Literature Review
Automate paper discovery and synthesis across 474M+ papers
Find Disagreement
Discover conflicting findings and counter-evidence
Paper Summarizer
Get structured summaries of any paper in seconds
See how researchers in Health & Medicine use PapersFlow
Field-specific workflows, example queries, and use cases.
Start Researching Xenotransplantation and immune response with AI
Search 474M+ papers, run AI-powered literature reviews, and write with integrated citations — all in one workspace.
See how PapersFlow works for Medicine researchers