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Doctoral Thesis
DOI
10.11606/T.5.2016.tde-07122016-153344
Document
Author
Full name
Daniela Cristina dos Santos
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2016
Supervisor
Committee
Câmara, Niels Olsen Saraiva (President)
Lemos, Francine Brambate Carvalhinho
Moura, Lúcio Roberto Requião
Dolhnikoff, Marisa
Viero, Rosa Marlene
Title in Portuguese
Estudo das células Natural Killer (NK) em biópsias de transplante renal com diagnóstico de rejeição aguda C4d positiva ou negativa
Keywords in Portuguese
Aloenxertos
C4d
CD56
Células matadoras naturais
Citotoxicidade celular anticorpo-dependente
Rejeição de enxerto
Transplante renal
Abstract in Portuguese
INTRODUÇÃO: O objetivo do estudo foi avaliar o perfil de marcadores imuno-histoquímicos relacionados às células NK em biópsias de aloenxertos renais com diagnóstico anatomopatológico de rejeição aguda (mediadas por células T ou anticorpos) e estabelecer relações desses marcadores com parâmetros morfológicos de lesão à microcirculação e sobrevida do enxerto. MÉTODOS: Estudo retrospectivo histórico que revisou 74 biópsias realizadas entre janeiro de 2009 e dezembro de 2012, de pacientes com rejeição aguda mediada por células T (n=36), rejeição aguda mediada por anticorpos com expressão positiva (n=19) ou negativa (n=19) para o marcador C4d, juntamente com levantamento de dados clínicos e laboratoriais pertinentes ao estudo. Foram realizadas reações imuno-histoquímicas, para os marcadores CD56, CD57, CD16, CD68, CD3, CD8 e CD4 com ênfase para os marcadores CD56 e CD16. Foi feita análise das células positivas em toda a cortical da biópsia nos compartimento intersticial, glomerular e vascular. Testes estatísticos foram aplicados conforme os pressupostos definidos no objetivo da pesquisa. RESULTADOS: No compartimento intersticial, células CD56+ (P = 0,004) e CD57+ (P < 0,001) foram expressas em maior quantidade em biópsias negativas para dosagem sérica de anticorpos específicos anti-doador (DSA) com diagnóstico de rejeição aguda mediada por células T. CD56 intersticial foi associado estatisticamente com presença de glomerulite (g >= 1) (P = 0,02) e ausência / leve capilarite peritubular (ptc <= 1) (P = 0,003). Células intersticiais positivas para o marcador CD56 com média superior a 0,56 céls/mm2 tiveram uma pior sobrevida do enxerto renal (P = 0,028). Biópsias com contagem inferior ou igual a 0,56 cél/mm2 tiveram associação estatisticamente significante para ausência ou leve capilarite peritubular (P = 0,012) e com contagem superior a 0,56 céls/mm2, foram associadas à presença de glomerulite (P = 0,002). Foi observado maior número de células positivas para o marcador CD16 no compartimento glomerular em biópsias positivas para dosagem sérica de DSA com diagnóstico de rejeição aguda mediada por anticorpos (P = 0,03) e em biópsias com presença de glomerulite (P = 0,009). Presença de maior número de células CD16+ no compartimento intersticial associou-se com capilarite peritubular (P = 0,0001). CONCLUSÕES: Maior expressão de células CD56 positivas no compartimento intersticial das biópsias foi significantemente associada com escores relacionados à lesão na microcirculação, especialmente glomerulite, com rejeição aguda mediada por células T e pior sobrevida do enxerto renal. Células CD16 positivas, no compartimento glomerular foram associadas com rejeição aguda mediada por anticorpos e glomerulite. As variações na expressão dos marcadores de células NK nos diferentes compartimentos da biópsia renal podem sugerir presença de envolvimento das células NK em diferentes vias do sistema imune nas rejeições agudas de aloenxertos renais
Title in English
Study of Natural Killer cells (NK) in renal transplant biopsies with positive or negative C4d acute rejection.
Keywords in English
Allografts
Antibody-dependent cell cytotoxicity
C4d
CD56
Graft rejection
Kidney transplantation
Killer cells natural
Abstract in English
INTRODUCTION: The aim of this study was to investigate the immunohistochemical profile of markers related to NK cells from renal allograft biopsies with morphological diagnosis of acute rejection (T-cells or antibodies mediated rejection) and to study associations of those markers with types of rejection, microcirculation injury morphological parameters and graft survival. METHODOLOGY: Historical retrospective study that reviewed 74 biopsies performed between January 2009 and December 2012 in patients with acute T-cell-mediated rejection (n=36) and acute antibody-mediated rejection with (n=19) or without evident C4d deposition (n=19). The study was performed with relevant clinical and laboratory data. Immunohistochemical reactions were performed for CD56, CD57, CD16, CD68, CD3, CD8 and CD4 markers with highlights for CD56 and CD16. Counting of positive cells throughout cortical biopsy was performed in glomerular, interstitial and vascular compartments. Statistical tests were applied according to assumptions set out the goal of the study.RESULTS: DSA-negative biopsies-from patients with acute T-cell mediated rejection (aTCMR) had an increased expression of CD56+ and CD57+ cells (P = 0.004 and P < 0.001) in the interstitial compartment in comparison with donor-specific antibodies ( DSA)-positive biopsies from patients acute antibody-mediated rejection with and without C4d deposition. Interstitial CD56+ cells had an increased expression for presence of glomerulitis (g >= 1) (P = 0.02) and peritubular capillaritis (ptc >= 2) (P = 0.003). Interstitial CD56 + cells with mean superior to 0.56cells/mm2 had worse allograft survival (P = 0.028). CD56+ cells in the interstitial compartment with mean inferior or equal to 0.56cells/mm2 associated with absence or mild peritubular capillaritis (P = 0.012) and mean superior to 0.56cells/mm2 was associated with presence of glomerulitis (P = 0.002). CD16+ cells was increased in the glomerular compartment in DSA-positive biopsies (P = 0.03) and in the presence of glomerulitis (P = 0.009). Interstitial CD16+ cells associated with peritubular capillaritis (P = 0.0001).CONCLUSION: CD56+ cell infiltrates in the interstitial compartment were significantly associated with microcirculation injury scores, especially glomerulitis, acute T-cell mediated rejection and clinical outcomes. CD16+ cell infiltrates in glomerular compartment was associated with acute antibody-mediated rejection and glomerulitis. Our findings showed variations in expression of NK cells markers in renal biopsy different compartments which might suggest the involvement of NK cells in different immune system pathways in acute renal allograft rejection
 
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Publishing Date
2016-12-19
 
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