Akutní humorální rejekce (AHR) představuje vzácnou komplikaci, která často vede ke ztrátě ledvinného štěpu. Cílem této retrospektivní monocentrické studie bylo zhodnotit 2 přístupy k léčbě AHR. Byla analyzována dokumentace 730 pacientů, kteří podstoupili transplantaci ledviny v letech 2002?2005. V letech 2002?2003 byli pacienti s AHR léčeni 5 plazmaferézami (skupina PF, n = 13) a v letech 2004?2005 kombinací 5 PF a intravenózních imunoglobulinů (PF + IVIG, 0,5 g/kg, n = 8). Byla analyzována data z období 1 roku po transplantaci ledviny. AHR se vyskytla u 21 ze 730 pacientů (2,9 %). Přežití štěpů v 6. měsíci a v 1. roce bylo signifikantně vyšší ve skupině PF + IVIG než ve skupině PF (p < 0,05). Přežití nemocných bylo v obou skupinách podobné. Výskyt infekčních komplikací byl v obou skupinách podobný. V kontrolních rebiopsiích (prováděných pro zhoršení funkce štěpu nebo k ověření účinnosti léčby) byl ve skupině PF vyšší výskyt akutních celulárních rejekcí (46,2 vs 14,3 %). Závěrem lze konstatovat, že akutní humorální rejekce transplantované ledviny představuje vzácnou komplikaci, která je léčitelná kombinací plazmaferéz a intravenózních imunoglobulinů., J. Slatinská, E. Honsová, L. Lyerová, and Lit. 16
Antibody-mediated rejection (ABMR) is a major obstacle to the long-term success in kidney transplantation. Diagnosis of ABMR is determined according to the internationally recognized Banff criteria. However, a significant proportion of patients does not meet all the defined criteria, and the outcome of such cases remains poorly understood. The histology of ABMR frequently lacks sensitivity and specificity. More importantly, mixed forms of ABMR and T cell-mediated rejection as well as findings of nonspecific injury are common in clinical settings. Donor-specific anti-HLA antibodies (DSA) are detectable only in half of the ABMR cases by histology. Prognostic role of non-HLA antibodies against various endothelial proteins has been discussed. Antibody independent NK cell activation reflecting killer-cells’ inhibitory receptor incompatibility is suggested in microvascular inflammation in DSA negative patients. Molecular assessment of ABMR has been prioritized to overcome high interobserver variability and improve diagnostics in mixed forms of rejections and in DSA negative cases. Finally, donor-derived cell-free DNA detected in a recipient’s peripheral blood sample has been proposed as a noninvasive marker for diagnosis of graft rejection, and thus might serve as a liquid biopsy in the near future. Despite all achievements, diagnosing ABMR in kidney allografts remains to be a challenge in a significant number of cases.
Peripheral blood monocytes, which serve as precursors for tissue macrophages and dendritic cells (DC), play a key role in the immune response to kidney allograft, reparation processes and homeostasis regulation. In this prospective study, we used multicolor flow cytometry to monitor the phenotypic patterns of peripheral monocytes in subjects with uncomplicated outcomes and those with acute rejection. We found a reciprocal increase in the proportion of "classical monocytes" (CD14+CD16-) along with a decline in pro-inflammatory "intermediary" (CD14+CD16+) and "non-classical" (CD14lowCD16+) monocytes in subjects with normal outcomes. In subjects with acute rejection, we observed no reduction in "intermediary" monocytes and no increase in "classical" monocytes. Patients with uncomplicated outcomes exhibited downregulated HLA-DR in all three monocyte subpopulations. However, non-classical monocytes were unaffected in subjects with acute rejection. Expression of CD47 was downregulated after transplantation, while patients with antibody-mediated rejection and donor-specific antibodies showed higher pre-transplant values. In monocytes isolated at the time of biopsy, CD47 expression was higher in individuals with acute rejection compared to patients with normal outcomes one year post-transplant. Expression of CD209 (DC-SIGN) and the proportion of CD163+CD206+ subpopulations were upregulated during the first week after kidney transplantation. CD209 was also upregulated in samples taken on the day of biopsy confirming acute rejection. Our data demonstrate that kidney allograft transplantation is associated with phenotypic changes in peripheral blood monocytes during acute rejection., Veronika Švachová, Lenka Krupičková, Marek Novotný, Martina Fialová, Kristýna Mezerová, Eva Čečrdlova, Věra Lánská, Antonij Slavčev, Ondřej Viklický, Ilja Stříž., and Obsahuje bibliografii
Denosumab is a human monoclonal antibody representing a novel therapy of osteoporosis. Contrary to always other antiosteoporotic drugs, it is not contraindicated in advanced chronic kidney disease, as its pharmacokinetic does not differ from patients with normal kidney function. However, published case reports in chronic kidney disease (CKD) patients stopped the therapy after single dose because of hypocalcemia. We present a case of successful treatment of osteoporosis in a young hemodialysis patient with repeated denosumab doses. and Sylvie Dusilová Sulková, Jiří Horáček, Roman Šafránek, Petr Gorun, Ondřej Viklický, Vladimír Palička
Transplantace ledviny od žijícího dárce inkompatibilního v krevní skupině představuje nový nástroj, jak zvýšit dostupnost transplantací. Většina evropských protokolů je založena na desenzitizačním protokolu s rituximabem, trojkombinace imunosupresiv, intravenózních imunoglobulinů a specifické imunoadsorpce, při které jsou z plazmy odstraňovány konkrétní hemaglutininy. Program transplantací ledvin od inkompatibilních dárců v krevní skupině byl v našem centru založen v roce 2011. Dosud bylo provedeno 21 těchto transplantací. Nejvyšší titr hemaglutininů před rituximabem byl 1 : 64 a korespondující počty imunoadsorpcí před transplantací od 2 do 9 výkonů. Po transplantaci byly imunoadsorpce prováděny podle aktuálního titru hemaglutininů 1–2krát u 5 nemocných. V posledních 2 letech jsou tyto transplantace nabízeny inkompatibilním příjemcům, kteří nenaleznou uplatnění v systému párových výměn ledvin anebo se účastní párové výměny s cílem dosáhnout vyšší míry shody v HLA antigenech. Hlavní komplikací bylo častější pooperační krvácení a infekce močových cest u rizikových nemocných. Ve většině protokolárních biopsií byla popsána pozitivita C4d barvení. Nebyla pozorována ztráta štěpu ani úmrtí nemocných., Living donor AB0 incompatible kidney transplantation represents a new tool how to improve the access to transplantation. Majority of European protocols are based on desensitization with rituximab, triple drug immunosuppression, intravenous immunoglobulins and specific immunoadsoption (IA) which eliminates isohaemaglutinins. AB0i kidney transplant program was initiated in our centre in 2011 and 21 patients have received grafts from incompatible donors until recently. Highest accepted isohaemaglutinins titers before rituximab were 1 : 64 and corresponding pretransplant immunoadsorption procedures varied from 2 to 9. In 5 patients 1–2 IA procedures were performed also after transplantation. With the advent of paired exchange program the AB0i transplantation is offered to patients with unsuccessful matching run or with aim to improve HLA match between donor and recipient. The main complications were postoperative bleeding and urinary tract infections in patients at risk. Majority of protocol biopsies exhibited positivity of C4d staining. Neither graft loss nor patient death were noticed., and Ondřej Viklický, Alena Paříková, Janka Slatinská, Vladimír Hanzal, Libuše Pagáčová, Eva Honsová, Eva Kieslichová, Libor Janoušek, Jiří Froněk
M2 macrophages expressing CD163 are known to suppress immune responses but have been also found in biopsies of patients with chronic kidney allograft injury associated with interstitial fibrosis. The aim of our study was to evaluate the expression of CD163 in blood monocytes, precursors of tissue macrophages, in kidney allograft recipients with uncomplicated outcome (n=94) compared with those developing acute rejection (n=44). Blood samples were collected before the transplantation and at 1 week, 1 month and 1 year. The expression of CD163 increased during the first week after the transplantation not only in classical (CD14+CD16- ) but also in intermediate (CD14+CD16+) and nonclassical (CD14lowCD16+) monocytes in all patients regardless of their rejection status. In patients developing acute rejection, higher pre-transplant expression of CD163 on blood monocytes was found. In vitro experiments confirmed strong induction of membrane CD163 on monocytes together with CD206 (an alternative marker of M2 macrophages) in response to IL-10. We assume from our data that dramatic upregulation of CD163 by peripheral blood monocytes may have a pathophysiological role in early phases after kidney allograft transplantation and high pre-transplant expression of CD163 on blood monocytes might be involved in events leading to acute rejection., Lenka Čurnová, Kristýna Mezerová, Veronika Švachová, Martina Fialová, Marek Novotný, Eva Čečrdlová, Ondřej Viklický, Ilja Stříž., and Obsahuje bibliografii