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host immune system to recognize and attack. The number and selection of MHC molecules to be considered when determining whether two individuals are histocompatible fluctuates based on application, however matching HLA-A, HLA-B, and HLA-DR has been shown to improve patient outcomes. Histocompatibility has a measurable effect on whole organ transplantation, increasing life expectancy of both the patient and organ. HLA similarity is therefore a relevant factor when choosing donors for tissue or organ transplant. This is especially important for pancreas and kidney transplants.
166:, with thousands of versions of the MHC receptors in the population, though any one individual can have no more than two versions for any one locus. MHC receptors are codominantly expressed, meaning all inherited alleles are expressed by the individual. The wide variety of potential alleles and multiple loci in the HLA allow for many unique combinations in individuals.
175:
72:, whose skin graft transplants in world war two victims showed that skin transplants between individuals had much higher rejection rates than self-transplants within an individual, and that suppressing the immune system delayed skin transplant rejection. Medawar shared the 1960 Nobel Prize in part for this work.
211:, and thus histocompatibility is not a factor in transplantation. Individual factors such as age sometimes factors into matching protocol, as the immune response of older transplant patients towards MHC proteins is slower and therefore less compatibility is necessary for positive results. Post-operative
194:
The degree of histocompatibility required is dependent on individual factors, including the type of tissue or organ and the medical condition of the recipient. While whole organ transplants can be successful between unmatched individuals, increased histocompatibility lowers rates of rejection, result
182:
After receiving a transplant, the recipient's T cells will become activated by foreign MHC molecules on the donor tissue and trigger the immune system to attack the donated tissue The more similar HLA alleles are between donor and recipient, the fewer foreign targets exist on the donor tissue for the
46:
recognize foreign HLA molecules and trigger an immune response to destroy the foreign cells. Histocompatibility testing is most relevant for topics related to whole organ, tissue, or stem cell transplants, where the similarity or difference between the donor's HLA alleles and the recipient's triggers
232:
Serological typing involves incubating lymphocytes from the recipient with serum containing known antibodies against the varying HLA alleles. If the serum contains an antibody specific for a HLA allele that is present on the recipient's lymphocyte, the antibodies will bind to the cell and activate a
186:
Due to the inherited nature of HLA genes, family members are more likely to be histocompatible. The odds of a sibling having received the same haplotypes from both parents is 25%, while there is a 50% chance that the sibling would share just one haplotype and a 25% chance they would share neither.
88:
in the 1950s, when he noticed that recipients of blood transfusions were producing antibodies directed against only the donor cells. The target of these antibodies, or the human leukocyte antigens (HLA), were discovered to be the human homologue of Snell and Gorer's mouse MHC. Snell, Dausset and
83:
individually isolated the genetic factors that when similar allowed transplantation between mouse strains, naming them H and antigen II respectively. These factors were in fact one and the same, and the locus was named H-2. Snell coined the term "histocompatibility" to describe the relationship
244:
Serological typing has the benefit of quickly identifying expressed HLA alleles, and ignores any non-expressed alleles that could be of little immunological significance. However, it does not recognize subclasses of alleles, which are sometimes necessary for matching.
195:
in longer lifespans, and overall lower associated hospital costs. The impact of HLA matching differs even among whole organ transplants, with some studies reporting less importance in liver transplants as compared to heart, lung, and other organs. In comparison,
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therapy is often used to lessen the immune response and prevent tissue rejection by dampening the immune system's response to the foreign HLA molecules, and can increase the likelihood of successful transplantation in non-identical transplant recipients.
257:
amplification, and direct sequencing can all be used to identify HLA alleles, often providing amino acid level resolution. Molecular methods can more accurately identify rare and unique alleles, but do not provide information about expression levels.
68:, which showed that tumors transplanted between genetically identical mice grew normally, but tumors transplanted between non-identical mice were rejected and failed to grow. The role of the immune system in transplant reject was proposed by
59:
The discovery of the MHC and role of histocompatibility in transplantation was a combined effort of many scientists in the 20th century. A genetic basis for transplantation rejection was proposed in a 1914 Nature paper by
42:(MHC). Each individual expresses many unique HLA proteins on the surface of their cells, which signal to the immune system whether a cell is part of the self or an invading organism.
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241:
allowing for identification. Comparing which serums triggers cell lysis allows identification of HLA alleles present on the cell surface of the recipients cells.
224:
Because of the clinical significance of histocompatibility in tissue transplants, several methods of typing are used to check for HLA allele expression.
253:
HLA alleles can be determined by directly analyzing the HLA loci on chromosome 6. Sequence specific oligonucleotide probes, sequence specific primer
159:—are only present on antigen presenting cells and are responsible for presenting molecules from invading organisms to cells of the immune system.
119:, one from each parent, each containing more than 200 genes relevant to helping the immune system recognize foreign invaders. These genes include
203:, in which the donor's immune system recognizes the recipient's MHC molecules as foreign and mounts an immune response. Some transplanted tissue
663:
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between the H-2 cell-surface proteins and transplant acceptance. The human version of the histocompatibility complex was found by
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the transplant. The wide variety of potential HLA alleles lead to unique combinations in individuals and make matching difficult.
196:
766:
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1088:"Role of major histocompatibility complex variation in graft-versus-host disease after hematopoietic cell transplantation"
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Apperley J, Niederwieser D, Huang XJ, Nagler A, Fuchs E, Szer J, Kodera Y (January 2016).
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signaling cascade resulting in cell lysis. A lysed cell will take up an added dye such as
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191:, haplotypes may rearrange between generations and siblings may be intermediate matches.
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836:"HLA Mismatching Strategies for Solid Organ Transplantation - A Balancing Act"
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426:"Clarence Cook Little (1888-1971): the genetic basis of transplant immunology"
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178:HLA genes and their location on chromosome 6
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147:is inside the cell. MHC Class II molecules—
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305:Dorlands Illustrated Medical Dictionary
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1144:Core concepts in renal transplantation
646:"Human Leukocyte Antigen (HLA) System"
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97:Major histocompatibility complex (MHC)
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1061:The Netherlands Journal of Medicine
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677:10.1146/annurev.iy.03.040185.001321
430:American Journal of Transplantation
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197:hematopoietic stem cell transplants
127:cell-surface proteins. MHC Class I
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107:HLA, the human form of the
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956:10.1016/j.bbmt.2015.11.001
704:Journal of Transplantation
644:Delves PJ (January 2017).
350:Ingulli E (January 2010).
322:"Human leukocyte antigens"
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368:10.1007/s00467-008-1020-x
205:is not exposed to T cells
201:graft-versus-host disease
162:The MHC genes are highly
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853:10.3389/fimmu.2016.00575
473:Starzl TE (March 1995).
75:In the 1930s and 1940s,
36:human leukocyte antigens
1026:Transplantation Reviews
840:Frontiers in Immunology
326:Genetics Home Reference
268:Clonal selection theory
170:Role in transplantation
1009:: CS1 maint: others (
623:. New York: Springer.
303:"Histocompatibility".
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111:(MHC), is located on
47:the immune system to
356:Pediatric Nephrology
284:Transplant rejection
24:tissue compatibility
717:10.1155/2012/842141
619:Kasahara M (2000).
1179:Histocompatibility
600:www.nobelprize.org
576:www.nobelprize.org
538:Elgert KD (2009).
519:www.nobelprize.org
228:Serological Typing
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20:Histocompatibility
768:978-0-8153-3642-6
630:978-4-431-70276-4
410:978-1-4292-0211-4
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290:References
235:complement
117:haplotypes
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55:Discovery
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