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Renal Transplant Injury and the Renin-Angiotensin System in Kids (RETASK)

NCT ID: NCT03317925

Last Updated: 2017-11-08

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

29 participants

Study Classification

OBSERVATIONAL

Study Start Date

2014-07-16

Study Completion Date

2017-04-26

Brief Summary

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In pediatric kidney transplant patients, rejection, medication toxicity and ischemia cause early and chronic renal allograft injury, which reduces graft lifespan and patient survival. Early detection of injury would facilitate prevention and treatment. The gold standard surveillance biopsy has limitations including delayed discovery of injury. No noninvasive test identifies graft injury before it is clinically apparent. This project's goal is to develop a novel early marker of subclinical graft injury to facilitate prompt recognition and treatment.

Detailed Description

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Kidney damage activates the traditional renin-angiotensin (Ang) system (RAS), characterized by Ang-converting enzyme (ACE)/Ang II/Ang II type 1 receptor. The Ang-converting enzyme 2 (ACE2)/Ang-(1-7)/Mas pathway counteracts this damage. The balance, or ratio, between levels of the ACE/Ang II and ACE2/Ang-(1-7) pathways may be clinically important because Ang-(1-7) counteracts Ang II-mediated injury. An increase in ACE and Ang II expression and a decrease in ACE2 and Ang-(1-7) expression on tubular cells may promote renal injury. Tubular damage may increase urinary loss of protective ACE2 and Ang-(1-7), propagating renal damage by allowing ACE and Ang II to stimulate inflammation and fibrosis unopposed. The investigators hypothesis is that a shift in the urinary ACE-to-ACE2 and Ang II-to-Ang-(1-7) ratios towards ACE2 and Ang-(1-7) predicts acute graft injury diagnosed on renal biopsy and predicts chronic graft damage on renal biopsy.

Conditions

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Renal Transplant Renin-Angiotensin System Rejection Acute Renal Rejection Chronic Renal Rejection of Renal Transplant

Keywords

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Pediatric Renal Transplant Renal Allograft Angiotensin II Angiotensin-(1-7) ACE ACE2

Study Design

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Observational Model Type

COHORT

Study Time Perspective

PROSPECTIVE

Interventions

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Renal Transplantation

Kidney transplantation and biomarkers that can identify injury after transplant.

Intervention Type PROCEDURE

Eligibility Criteria

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Inclusion Criteria

* Ages 1 - 20 years
* Actively listed on the transplant list at Lucile Packard Children's Hospital at Stanford and received a renal transplant during the study enrollment period

Exclusion Criteria

* Transplanted at a center other than Lucile Packard Children's Hospital at Stanford
Minimum Eligible Age

1 Year

Maximum Eligible Age

20 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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Stanford University

OTHER

Sponsor Role collaborator

Wake Forest University Health Sciences

OTHER

Sponsor Role lead

Responsible Party

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Responsibility Role SPONSOR

Principal Investigators

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Andrew M South, MD MS

Role: PRINCIPAL_INVESTIGATOR

Wake Forest University Health Sciences

Locations

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Wake Forest University Baptist Medical Center

Winston-Salem, North Carolina, United States

Site Status

Countries

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United States

References

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Furness PN, Taub N, Assmann KJ, Banfi G, Cosyns JP, Dorman AM, Hill CM, Kapper SK, Waldherr R, Laurinavicius A, Marcussen N, Martins AP, Nogueira M, Regele H, Seron D, Carrera M, Sund S, Taskinen EI, Paavonen T, Tihomirova T, Rosenthal R. International variation in histologic grading is large, and persistent feedback does not improve reproducibility. Am J Surg Pathol. 2003 Jun;27(6):805-10. doi: 10.1097/00000478-200306000-00012.

Reference Type BACKGROUND
PMID: 12766585 (View on PubMed)

Solez K, Colvin RB, Racusen LC, Haas M, Sis B, Mengel M, Halloran PF, Baldwin W, Banfi G, Collins AB, Cosio F, David DS, Drachenberg C, Einecke G, Fogo AB, Gibson IW, Glotz D, Iskandar SS, Kraus E, Lerut E, Mannon RB, Mihatsch M, Nankivell BJ, Nickeleit V, Papadimitriou JC, Randhawa P, Regele H, Renaudin K, Roberts I, Seron D, Smith RN, Valente M. Banff 07 classification of renal allograft pathology: updates and future directions. Am J Transplant. 2008 Apr;8(4):753-60. doi: 10.1111/j.1600-6143.2008.02159.x. Epub 2008 Feb 19.

Reference Type BACKGROUND
PMID: 18294345 (View on PubMed)

Halawa A. The early diagnosis of acute renal graft dysfunction: a challenge we face. The role of novel biomarkers. Ann Transplant. 2011 Jan-Mar;16(1):90-8.

Reference Type BACKGROUND
PMID: 21436782 (View on PubMed)

Hall IE, Yarlagadda SG, Coca SG, Wang Z, Doshi M, Devarajan P, Han WK, Marcus RJ, Parikh CR. IL-18 and urinary NGAL predict dialysis and graft recovery after kidney transplantation. J Am Soc Nephrol. 2010 Jan;21(1):189-97. doi: 10.1681/ASN.2009030264. Epub 2009 Sep 17.

Reference Type BACKGROUND
PMID: 19762491 (View on PubMed)

Schaub S, Mayr M, Honger G, Bestland J, Steiger J, Regeniter A, Mihatsch MJ, Wilkins JA, Rush D, Nickerson P. Detection of subclinical tubular injury after renal transplantation: comparison of urine protein analysis with allograft histopathology. Transplantation. 2007 Jul 15;84(1):104-12. doi: 10.1097/01.tp.0000268808.39401.e8.

Reference Type BACKGROUND
PMID: 17627245 (View on PubMed)

Ruster C, Wolf G. Renin-angiotensin-aldosterone system and progression of renal disease. J Am Soc Nephrol. 2006 Nov;17(11):2985-91. doi: 10.1681/ASN.2006040356. Epub 2006 Oct 11.

Reference Type BACKGROUND
PMID: 17035613 (View on PubMed)

Iwai M, Horiuchi M. Devil and angel in the renin-angiotensin system: ACE-angiotensin II-AT1 receptor axis vs. ACE2-angiotensin-(1-7)-Mas receptor axis. Hypertens Res. 2009 Jul;32(7):533-6. doi: 10.1038/hr.2009.74. Epub 2009 May 22.

Reference Type BACKGROUND
PMID: 19461648 (View on PubMed)

Ferrario CM. ACE2: more of Ang-(1-7) or less Ang II? Curr Opin Nephrol Hypertens. 2011 Jan;20(1):1-6. doi: 10.1097/MNH.0b013e3283406f57.

Reference Type BACKGROUND
PMID: 21045683 (View on PubMed)

Santos RA, Ferreira AJ, Pinheiro SV, Sampaio WO, Touyz R, Campagnole-Santos MJ. Angiotensin-(1-7) and its receptor as a potential targets for new cardiovascular drugs. Expert Opin Investig Drugs. 2005 Aug;14(8):1019-31. doi: 10.1517/13543784.14.8.1019.

Reference Type BACKGROUND
PMID: 16050794 (View on PubMed)

Santos RA, Ferreira AJ, Simoes E Silva AC. Recent advances in the angiotensin-converting enzyme 2-angiotensin(1-7)-Mas axis. Exp Physiol. 2008 May;93(5):519-27. doi: 10.1113/expphysiol.2008.042002. Epub 2008 Feb 29.

Reference Type BACKGROUND
PMID: 18310257 (View on PubMed)

Dilauro M, Burns KD. Angiotensin-(1-7) and its effects in the kidney. ScientificWorldJournal. 2009 Jun 30;9:522-35. doi: 10.1100/tsw.2009.70.

Reference Type BACKGROUND
PMID: 19578709 (View on PubMed)

Heringer-Walther S, Eckert K, Schumacher SM, Uharek L, Wulf-Goldenberg A, Gembardt F, Fichtner I, Schultheiss HP, Rodgers K, Walther T. Angiotensin-(1-7) stimulates hematopoietic progenitor cells in vitro and in vivo. Haematologica. 2009 Jun;94(6):857-60. doi: 10.3324/haematol.2008.000034. Epub 2009 Apr 18.

Reference Type BACKGROUND
PMID: 19377080 (View on PubMed)

Geara AS, Azzi J, Jurewicz M, Abdi R. The renin-angiotensin system: an old, newly discovered player in immunoregulation. Transplant Rev (Orlando). 2009 Jul;23(3):151-8. doi: 10.1016/j.trre.2009.04.002.

Reference Type BACKGROUND
PMID: 19539879 (View on PubMed)

Miyake-Ogawa C, Miyazaki M, Abe K, Harada T, Ozono Y, Sakai H, Koji T, Kohno S. Tissue-specific expression of renin-angiotensin system components in IgA nephropathy. Am J Nephrol. 2005 Jan-Feb;25(1):1-12. doi: 10.1159/000083224. Epub 2005 Jan 7.

Reference Type BACKGROUND
PMID: 15644622 (View on PubMed)

Jurewicz M, McDermott DH, Sechler JM, Tinckam K, Takakura A, Carpenter CB, Milford E, Abdi R. Human T and natural killer cells possess a functional renin-angiotensin system: further mechanisms of angiotensin II-induced inflammation. J Am Soc Nephrol. 2007 Apr;18(4):1093-102. doi: 10.1681/ASN.2006070707. Epub 2007 Feb 28.

Reference Type BACKGROUND
PMID: 17329576 (View on PubMed)

Su Z, Zimpelmann J, Burns KD. Angiotensin-(1-7) inhibits angiotensin II-stimulated phosphorylation of MAP kinases in proximal tubular cells. Kidney Int. 2006 Jun;69(12):2212-8. doi: 10.1038/sj.ki.5001509. Epub 2006 May 3.

Reference Type BACKGROUND
PMID: 16672906 (View on PubMed)

Moon JY. ACE2 and Angiotensin-(1-7) in Hypertensive Renal Disease. Electrolyte Blood Press. 2011 Dec;9(2):41-4. doi: 10.5049/EBP.2011.9.2.41. Epub 2011 Dec 31.

Reference Type BACKGROUND
PMID: 22438854 (View on PubMed)

Ahmed AK, El Nahas AM, Johnson TS. Changes in matrix metalloproteinases and their inhibitors in kidney transplant recipients. Exp Clin Transplant. 2012 Aug;10(4):332-43. doi: 10.6002/ect.2012.0013.

Reference Type BACKGROUND
PMID: 22845765 (View on PubMed)

Castoldi G, di Gioia CR, Travaglini C, Busca G, Redaelli S, Bombardi C, Stella A. Angiotensin II increases tissue-specific inhibitor of metalloproteinase-2 expression in rat aortic smooth muscle cells in vivo: evidence of a pressure-independent effect. Clin Exp Pharmacol Physiol. 2007 Mar;34(3):205-9. doi: 10.1111/j.1440-1681.2007.04573.x.

Reference Type BACKGROUND
PMID: 17250640 (View on PubMed)

Mazanowska O, Kaminska D, Krajewska M, Zabinska M, Kopec W, Boratynska M, Chudoba P, Patrzalek D, Klinger M. Imbalance of metallaproteinase/tissue inhibitors of metalloproteinase system in renal transplant recipients with chronic allograft injury. Transplant Proc. 2011 Oct;43(8):3000-3. doi: 10.1016/j.transproceed.2011.08.012.

Reference Type BACKGROUND
PMID: 21996210 (View on PubMed)

Ling XB, Sigdel TK, Lau K, Ying L, Lau I, Schilling J, Sarwal MM. Integrative urinary peptidomics in renal transplantation identifies biomarkers for acute rejection. J Am Soc Nephrol. 2010 Apr;21(4):646-53. doi: 10.1681/ASN.2009080876. Epub 2010 Feb 11.

Reference Type BACKGROUND
PMID: 20150539 (View on PubMed)

Lutz J, Yao Y, Song E, Antus B, Hamar P, Liu S, Heemann U. Inhibition of matrix metalloproteinases during chronic allograft nephropathy in rats. Transplantation. 2005 Mar 27;79(6):655-61. doi: 10.1097/01.tp.0000151644.85832.b5.

Reference Type BACKGROUND
PMID: 15785371 (View on PubMed)

Pan CH, Wen CH, Lin CS. Interplay of angiotensin II and angiotensin(1-7) in the regulation of matrix metalloproteinases of human cardiocytes. Exp Physiol. 2008 May;93(5):599-612. doi: 10.1113/expphysiol.2007.041830. Epub 2008 Feb 22.

Reference Type BACKGROUND
PMID: 18296491 (View on PubMed)

Clark MA, Tallant EA, Diz DI. Downregulation of the AT1A receptor by pharmacologic concentrations of Angiotensin-(1-7). J Cardiovasc Pharmacol. 2001 Apr;37(4):437-48. doi: 10.1097/00005344-200104000-00011.

Reference Type BACKGROUND
PMID: 11300657 (View on PubMed)

Brosnihan KB, Neves LA, Joyner J, Averill DB, Chappell MC, Sarao R, Penninger J, Ferrario CM. Enhanced renal immunocytochemical expression of ANG-(1-7) and ACE2 during pregnancy. Hypertension. 2003 Oct;42(4):749-53. doi: 10.1161/01.HYP.0000085220.53285.11. Epub 2003 Jul 21.

Reference Type BACKGROUND
PMID: 12874086 (View on PubMed)

Koka V, Huang XR, Chung AC, Wang W, Truong LD, Lan HY. Angiotensin II up-regulates angiotensin I-converting enzyme (ACE), but down-regulates ACE2 via the AT1-ERK/p38 MAP kinase pathway. Am J Pathol. 2008 May;172(5):1174-83. doi: 10.2353/ajpath.2008.070762. Epub 2008 Apr 10.

Reference Type BACKGROUND
PMID: 18403595 (View on PubMed)

Dong J, Wong SL, Lau CW, Lee HK, Ng CF, Zhang L, Yao X, Chen ZY, Vanhoutte PM, Huang Y. Calcitriol protects renovascular function in hypertension by down-regulating angiotensin II type 1 receptors and reducing oxidative stress. Eur Heart J. 2012 Dec;33(23):2980-90. doi: 10.1093/eurheartj/ehr459. Epub 2012 Jan 19.

Reference Type BACKGROUND
PMID: 22267242 (View on PubMed)

Dai B, David V, Martin A, Huang J, Li H, Jiao Y, Gu W, Quarles LD. A comparative transcriptome analysis identifying FGF23 regulated genes in the kidney of a mouse CKD model. PLoS One. 2012;7(9):e44161. doi: 10.1371/journal.pone.0044161. Epub 2012 Sep 6.

Reference Type BACKGROUND
PMID: 22970174 (View on PubMed)

Ejaz AA, Kambhampati G, Ejaz NI, Dass B, Lapsia V, Arif AA, Asmar A, Shimada M, Alsabbagh MM, Aiyer R, Johnson RJ. Post-operative serum uric acid and acute kidney injury. J Nephrol. 2012 Jul-Aug;25(4):497-505. doi: 10.5301/jn.5000173.

Reference Type BACKGROUND
PMID: 22684655 (View on PubMed)

el-Agroudy AE, Hassan NA, Foda MA, Ismail AM, el-Sawy EA, Mousa O, Ghoneim MA. Effect of angiotensin II receptor blocker on plasma levels of TGF-beta 1 and interstitial fibrosis in hypertensive kidney transplant patients. Am J Nephrol. 2003 Sep-Oct;23(5):300-6. doi: 10.1159/000072820. Epub 2003 Aug 6.

Reference Type BACKGROUND
PMID: 12904684 (View on PubMed)

Haririan A, Metireddy M, Cangro C, Nogueira JM, Rasetto F, Cooper M, Klassen DK, Weir MR. Association of serum uric acid with graft survival after kidney transplantation: a time-varying analysis. Am J Transplant. 2011 Sep;11(9):1943-50. doi: 10.1111/j.1600-6143.2011.03613.x. Epub 2011 Aug 3.

Reference Type BACKGROUND
PMID: 21812917 (View on PubMed)

Kanellis J, Watanabe S, Li JH, Kang DH, Li P, Nakagawa T, Wamsley A, Sheikh-Hamad D, Lan HY, Feng L, Johnson RJ. Uric acid stimulates monocyte chemoattractant protein-1 production in vascular smooth muscle cells via mitogen-activated protein kinase and cyclooxygenase-2. Hypertension. 2003 Jun;41(6):1287-93. doi: 10.1161/01.HYP.0000072820.07472.3B. Epub 2003 May 12.

Reference Type BACKGROUND
PMID: 12743010 (View on PubMed)

Numakura K, Satoh S, Tsuchiya N, Saito M, Maita S, Obara T, Tsuruta H, Inoue T, Narita S, Horikawa Y, Kagaya H, Miura M, Habuchi T. Hyperuricemia at 1 year after renal transplantation, its prevalence, associated factors, and graft survival. Transplantation. 2012 Jul 27;94(2):145-51. doi: 10.1097/TP.0b013e318254391b.

Reference Type BACKGROUND
PMID: 22728291 (View on PubMed)

Feig DI. Hyperuricemia and hypertension. Adv Chronic Kidney Dis. 2012 Nov;19(6):377-85. doi: 10.1053/j.ackd.2012.05.009.

Reference Type BACKGROUND
PMID: 23089272 (View on PubMed)

Szabo A, Lutz J, Schleimer K, Antus B, Hamar P, Philipp T, Heemann U. Effect of angiotensin-converting enzyme inhibition on growth factor mRNA in chronic renal allograft rejection in the rat. Kidney Int. 2000 Mar;57(3):982-91. doi: 10.1046/j.1523-1755.2000.00926.x.

Reference Type BACKGROUND
PMID: 10720951 (View on PubMed)

Tylicki L, Biedunkiewicz B, Chamienia A, Wojnarowski K, Zdrojewski Z, Aleksandrowicz E, Lysiak-Szydlowska W, Rutkowski B. Renal allograft protection with angiotensin II type 1 receptor antagonists. Am J Transplant. 2007 Jan;7(1):243-8. doi: 10.1111/j.1600-6143.2006.01588.x.

Reference Type BACKGROUND
PMID: 17227571 (View on PubMed)

Luque M, Martin P, Martell N, Fernandez C, Brosnihan KB, Ferrario CM. Effects of captopril related to increased levels of prostacyclin and angiotensin-(1-7) in essential hypertension. J Hypertens. 1996 Jun;14(6):799-805. doi: 10.1097/00004872-199606000-00017.

Reference Type BACKGROUND
PMID: 8793704 (View on PubMed)

Shah PR, Kute VB, Saboo DS, Goplani KR, Gumber MR, Vanikar AV, Patel HV, Trivedi HL. Safety and efficacy of angiotensin converting enzyme inhibitors and angiotensin receptor blockers in chronic allograft injury. Saudi J Kidney Dis Transpl. 2011 Nov;22(6):1128-32.

Reference Type BACKGROUND
PMID: 22089769 (View on PubMed)

Arbeiter K, Pichler A, Stemberger R, Mueller T, Ruffingshofer D, Vargha R, Balzar E, Aufricht C. ACE inhibition in the treatment of children after renal transplantation. Pediatr Nephrol. 2004 Feb;19(2):222-6. doi: 10.1007/s00467-003-1317-8. Epub 2003 Dec 13.

Reference Type BACKGROUND
PMID: 14673630 (View on PubMed)

Oudit GY, Herzenberg AM, Kassiri Z, Wong D, Reich H, Khokha R, Crackower MA, Backx PH, Penninger JM, Scholey JW. Loss of angiotensin-converting enzyme-2 leads to the late development of angiotensin II-dependent glomerulosclerosis. Am J Pathol. 2006 Jun;168(6):1808-20. doi: 10.2353/ajpath.2006.051091.

Reference Type BACKGROUND
PMID: 16723697 (View on PubMed)

Mizuiri S, Hemmi H, Arita M, Ohashi Y, Tanaka Y, Miyagi M, Sakai K, Ishikawa Y, Shibuya K, Hase H, Aikawa A. Expression of ACE and ACE2 in individuals with diabetic kidney disease and healthy controls. Am J Kidney Dis. 2008 Apr;51(4):613-23. doi: 10.1053/j.ajkd.2007.11.022. Epub 2008 Mar 4.

Reference Type BACKGROUND
PMID: 18371537 (View on PubMed)

Mizuiri S, Hemmi H, Arita M, Aoki T, Ohashi Y, Miyagi M, Sakai K, Shibuya K, Hase H, Aikawa A. Increased ACE and decreased ACE2 expression in kidneys from patients with IgA nephropathy. Nephron Clin Pract. 2011;117(1):c57-66. doi: 10.1159/000319648. Epub 2010 Aug 4.

Reference Type BACKGROUND
PMID: 20689326 (View on PubMed)

Mizuiri S, Aoki T, Hemmi H, Arita M, Sakai K, Aikawa A. Urinary angiotensin-converting enzyme 2 in patients with CKD. Nephrology (Carlton). 2011 Aug;16(6):567-72. doi: 10.1111/j.1440-1797.2011.01467.x.

Reference Type BACKGROUND
PMID: 21457402 (View on PubMed)

Xiao F, Hiremath S, Knoll G, Zimpelmann J, Srivaratharajah K, Jadhav D, Fergusson D, Kennedy CR, Burns KD. Increased urinary angiotensin-converting enzyme 2 in renal transplant patients with diabetes. PLoS One. 2012;7(5):e37649. doi: 10.1371/journal.pone.0037649. Epub 2012 May 22.

Reference Type BACKGROUND
PMID: 22629438 (View on PubMed)

Grimm PC, Nickerson P, Gough J, McKenna R, Stern E, Jeffery J, Rush DN. Computerized image analysis of Sirius Red-stained renal allograft biopsies as a surrogate marker to predict long-term allograft function. J Am Soc Nephrol. 2003 Jun;14(6):1662-8. doi: 10.1097/01.asn.0000066143.02832.5e.

Reference Type BACKGROUND
PMID: 12761269 (View on PubMed)

Provided Documents

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Document Type: Study Protocol and Statistical Analysis Plan

View Document

Other Identifiers

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00046001

Identifier Type: -

Identifier Source: org_study_id