90-kDa N-domain angiotensin I-converting enzyme (ACE): possible marker for hypertension in a renal transplant model.

INTRODUCTION: Hypertension is nearly universal in kidney transplant and several factors are associated with post transplant hypertension, including immunosuppressive medications and genetic predisposition. OBJECTIVE: The aims were to evaluate the effects of spontaneously hypertensive rats (SHR) kidney transplantation in Wistar rats and the possible transference of 80/90-kDa N-domain ACE. METHODS: To do so, the data from Wistar recipients of kidney from SHR were compared to data from transplanted Wistar submitted to CsA treatment and, to Wistar Sham. RESULTS AND DISCUSSION: Despite the unaltered blood pressure observed at early stages, 80/90-kDa ACE was found expressed in the urine of rats 7 and 15 days after transplantation, which was intense when rats became hypertensive 30 days post-surgery. CONCLUSION: Our data show that this enzyme is associated with the development of hypertension, and this marker appears in the urine before any substantial blood pressure alteration.

90-kDa N-domain angiotensin I-converting enzyme (ACE): possible marker for hypertension in a renal transplant model / Enzima conversora de angiotensina I (ECA) N-domínio 90-kDa: possível marcador para hipertensão em modelo de transplante renal

Abstract Introduction: Hypertension is nearly universal in kidney transplant and several factors are associated with post transplant hypertension, including immunosuppressive medications and genetic predisposition. Objective: The aims were to evaluate the effects of spontaneously hypertensive rats (SHR) kidney transplantation in Wistar rats and the possible transference of 80/90-kDa N-domain ACE. Methods: To do so, the data from Wistar recipients of kidney from SHR were compared to data from transplanted Wistar submitted to CsA treatment and, to Wistar Sham. Results and Discussion: Despite the unaltered blood pressure observed at early stages, 80/90-kDa ACE was found expressed in the urine of rats 7 and 15 days after transplantation, which was intense when rats became hypertensive 30 days post-surgery. Conclusion: Our data show that this enzyme is associated with the development of hypertension, and this marker appears in the urine before any substantial blood pressure alteration.

Resumo Introdução: A hipertensão é altamente prevalente pós-transplante renal e vários fatores estão associados incluindo o tratamento com imunossupressores e a predisposição genética. Objetivo: Os objetivos foram avaliar os efeitos do transplante do rim de ratos espontaneamente hipertensos (SHR) em ratos Wistar, e a possível transferência da ECA N-domínio de 80/90-kDa para os tecidos dos receptores. Métodos: Para isso, os dados dos animais Wistar receptores dos rins de SHR foram comparados aos dados dos Wistar submetidos ao tratamento com CsA e Wistar Sham. Resultados e Discussão: Apesar da pressão arterial permanecer inalterada nos estágios iniciais pós-transplante renal, a expressão da ECA de 80/90-kDa foi identificada na urina de ratos 7 e 15 dias após o transplante, e de forma mais intensa aos 30 dias após a cirurgia, quando os animais tornaram-se hipertensos. Conclusão: Nossos dados mostram que ECA N-domínio está associada ao desenvolvimento da hipertensão, e que este marcador pode ser identificado na urina pós-transplante renal antes mesmo de qualquer alteração da pressão arterial.

HSP70 induced by hyperosmotic stress partially protects LLC-PK1 cells against nephrotoxic drugs.

Accumulation of HSP70 is related to the cytoprotection. It was evaluated whether hyperosmotic stress induces HSP70 accumulation in LLC-PK1 cells, and protects cells against toxicity provoked by cisplatin (Cis) and cyclosporine A (CyA). Cells were maintained in isosmotic (Iso) or hyperosmotic (H) culture medium for 24 h and then exposed to Cis or CyA for an additional period of 12 or 24 h (groups H+Cis and H+CyA). The H medium did not induce cell death and increased both HSP70 mRNA and protein levels, suggesting a role in cell adaptation to H condition. H medium produced partial cytoprotection against Cis and CyA compared with control cells. Despite the cytoprotection, there was a reduction in HSP70 mRNA and protein levels in H+Cis group. In contrast, the H+CyA group presented high levels of HSP70 mRNA and protein. The induction of HSP70 by H medium was associated with tolerance of LLC-PK1 cells against Cis and CyA cytotoxicity but this protection was induced by different mechanisms and depended on the characteristics of the drug used.