title: Factor XII, plasma prekallikrein, alpha 2-macroglobulin and C1-inhibitor levels in renal allograft recipients during immunosuppression with cyclosporin A--sequential measurements over four months in 17 patients.
abstract: Factor XII clotting activity (F XII), plasma prekallikrein amidolytic activity (PK), alpha 2-Macroglobulin (alpha 2-M) and C1-Inhibitor (C1-Inh) antigens have been measured in 17 patients immediately before and sequentially for up to four months after kidney transplantation. Before transplantation mean F XII and PK levels were normal (99 +/- 27% and 102 +/- 21%, respectively, mean +/- S.D.) and alpha 2-M and C1-Inh levels were slightly elevated (115 +/- 55% and 129 +/- 32%, respectively, mean +/- S.D.). In the first two weeks after transplantation a significant decrease of F XII to 65 +/- 27%, of PK to 67 +/- 20% and of alpha 2-M to 88 +/- 42%, and a rise of C1-Inh to 201 +/- 44% (mean +/- S.D.) were observed (2 p less than 0.005). F XII levels four month after operation remained significantly (2 p less than 0.05) lower than preoperatively. PK and alpha 2-M values, however, were significantly higher (2 p less than 0.05) at four months as compared to the pretransplant period. Mean F XII levels in the 17 patients at various time points after transplantation correlated positively with PK, alpha 2-M and serum albumin and negatively with CyA level and dose and serum bilirubin. PK and alpha 2-M correlated positively with each other and albumin and negatively with creatinine, bilirubin and CyA (2 p less than 0.01). Whether CyA has a direct influence on production or consumption of F XII, PK, alpha 2-M and C1-Inh, or whether the changes merely reflect altered protein metabolism awaits further study.
mesh_terms: D000328:Adult; D001777:Blood Coagulation / Q000187:drug effects*; D003174:Complement C1 Inactivator Proteins / Q000097:blood; D003524:Cyclosporins / Q000009:adverse effects*; D004211:Disseminated Intravascular Coagulation / Q000209:etiology; D005174:Factor XII / Q000378:metabolism; D005260:Female; D006463:Hemolytic-Uremic Syndrome / Q000209:etiology; D006801:Humans; D007668:Kidney / Q000187:drug effects; D016030:Kidney Transplantation; D008297:Male; D008875:Middle Aged; D011288:Prekallikrein / Q000032:analysis; D013997:Time Factors; D000511:alpha-Macroglobulins / Q000378:metabolism
chemical_list: D003174:Complement C1 Inactivator Proteins; D003524:Cyclosporins; D000511:alpha-Macroglobulins; D005174:Factor XII; D011288:Prekallikrein