Approaches to the evaluation of histocompatibility antigens

Fritz H. Bach1
1Immunobiology Research Center, University of Wisconsin, Madison, USA

Tóm tắt

The strong transplantation antigens (called histocompatibility or H antigens) in a number of species are determined by genes of a single genetic complex — the major histocompatibility complex. While there are other H antigens which, if different in two individuals, can lead to graft rejection, it is the antigens of the major histocompatibility complex which are of overwhelming importance. These antigens can be divided into two classes: first, the antigens initially detected by serological methods which are present on the surfaces of all lymphoid cells and essentially all other tissues; second, those differences between cells which lead to activation of lymphocytes in the Mixed Leukocyte Culture (MLC) test. These two components of the major histocompatibility complex have been referred to as the SD and LD components respectively. Since both these types of differences apparently lead to graft rejection, it is desirable to match donor and recipient optimally for both systems. This is best achieved by minimizing the number of SD antigens by which donor and recipient differ and by assuring the lowest degree of stimulation in the MLC test between donor and recipient. Gli antigeni forti del trapianto (denominati antigeni H o dell’istocompatibilitè) sono controllati, in talune specie, da geni di un singololocus genetico: illocus principale dell’istocompatibilitè. Sebbene esistano altri antigeni H che, se diversi in due individui, possono portare al rigetto del trapianto, gli antigeni dellocus principale dell’istocompatibilitè sono senz’altro i più importanti. Tali antigeni possono essere suddivisi in due classi: la prima comprende gli antigeni esplorati all’inizio mediante metodiche sierologiche, i quali sono presenti sulle superficie di tutte le cellule linfoidi e praticamente in tutti gli altri tessuti, e la seconda le differenze tra le cellule che provocano attivazione linfocitaria nel test di coltura mista leucocitaria (MLC). Queste due componenti dellocus principale dell’istocompatibilitè sono state denominate rispettivamente componente SD e LD. Poiché queste differenze sembrano condurre entrambe al rigetto del trapianto, è bene rendere compatibili in modo ottimale il donatore ed il ricevente ad entrambi i sistemi. Il modo migliore per ottenere questo risultato è la riduzione al massimo degli antigeni SD che differenziano il donatore ed il ricevente e l’induzione dlia più bassa stimolazione nel test MLC tra donatore e ricevente.

Tài liệu tham khảo

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