Immune Response Transplantation
Immune Response Transplantation - Related Videos
01:36
Humoral Immune Responses
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2019
Overview The humoral immune response, also known as the antibody-mediated immune response, targets pathogens circulating in “humors,” or extracellular fluids, such as blood and lymph. Antibodies target invading pathogens for destruction via multiple defense mechanisms, including neutralization, opsonization, and activation of the complement system. Patients that are impaired in the production of antibodies suffer from severe and frequent infections by common pathogens and unusual pathogens. B...
09:43
Transplantation of Zebrafish Pediatric Brain Tumors into Immune-competent Hosts for Long-term Study of Tumor Cell Behavior and Drug Response
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Cited by 22 •
2017
The transplantation of cancer cells is an important tool for the identification of cancer mechanisms and therapeutic responses. Current techniques depend on immune-incompetent animals. Here, we describe a method to transplant zebrafish tumor cells into immune-competent embryos for the long-term analysis of tumor cell behavior and in vivo drug responses.
07:33
Bioluminescence Imaging for Assessment of Immune Responses Following Implantation of Engineered Heart Tissue (EHT)
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Cited by 4 •
2011
This video demonstrates the use of in vivo bioluminescence imaging to study immune responses after implantation of Engineered Heart Tissue (EHT) in rats.
09:39
Normal and Malignant Muscle Cell Transplantation into Immune Compromised Adult Zebrafish
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Cited by 16 •
2014
Here, we present a protocol for cell transplantation of zebrafish skeletal muscle and embryonal rhabdomyosarcoma (ERMS) into adult immune compromised rag2E450fs homozygous mutant zebrafish. This protocol allows for the efficient analysis of regeneration and malignant transformation of muscle cells.
18:48
In Vitro and In Vivo Assessment of T, B and Myeloid Cells Suppressive Activity and Humoral Responses from Transplant Recipients
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Cited by 1 •
2017
Here, we present a protocol to induce tolerance in transplantation, and assess in vitro and in vivo the suppressive capacity of distinct cell subsets from the recipient and the immune status of the recipient toward donor or exogenous antigens.
FAQs
Direct allorecognition occurs when recipient T cells detect donor antigens presented by donor cells. In indirect allorecognition, recipient immune cells process donor-derived material and present it through the recipient’s own antigen-presenting system. This distinction matters because both routes can activate immune responses, but they represent different pathways by which the recipient identifies the graft as immunologically different.
Human leukocyte antigens, or HLA, are major targets of immune recognition because differences between donor and recipient provide signals that recipient T cells can detect. Greater antigenic differences can support stronger activation of cellular and downstream immune pathways. Consequently, HLA-related recognition is an important scientific focus when explaining why some grafts face rejection and others maintain better function.
After donor antigens activate recipient immunity, cytokines can amplify communication among immune cells, antibodies can contribute to recognition of graft-associated targets, and cytotoxic pathways can injure target cells directly. These mechanisms may operate together rather than independently. Their combined activity helps explain how an initially specific recognition event can develop into tissue damage and impaired graft survival.
Immunosuppressive therapies reduce the recipient’s immune responses to protect the graft, whereas immune tolerance strategies aim to preserve graft acceptance without broadly weakening host defense. The distinction is important because reducing immunity can affect more than the transplant itself. Comparing these approaches helps researchers consider both graft protection and the consequences of altering normal immune function.
Protecting a graft requires controlling immune reactions against donor tissue, but broad reduction of host defenses can create concerns about infection risk. This makes transplant outcomes more complex than rejection alone. Research therefore examines how immune suppression influences graft survival while also considering whether immune protection against infectious threats may be weakened.
Mechanistic knowledge links donor-antigen recognition with cytokine activity, antibodies, cytotoxic pathways, and the effects of immunosuppressive or tolerance-focused strategies. Researchers can use this framework to interpret rejection, evaluate risks associated with immune suppression, and investigate long-term graft function. In immunology and infection research, the same framework connects transplant success with preservation of host defense.