A multinational phase IIb/III trial of beraprost sodium, an orally active prostacyclin analogue, in patients with primary glomerular disease or nephrosclerosis (CASSIOPEIR trial), rationale and study design
© Nakamoto et al.; licensee BioMed Central Ltd. 2014
Received: 20 May 2014
Accepted: 28 August 2014
Published: 19 September 2014
Chronic kidney disease (CKD) is public health concern even in Asian countries. TRK-100STP, a sustained release tablet of an orally-active prostacyclin analogue, beraprost sodium, is suggested to suppress worsening of some parameters of renal filtration function, containing in slope of 1/serum creatinine (1/SCr) vs. time in a phase II clinical trial.
We describe the design of the phase IIb/III trial of TRK-100STP, CASSIOPEIR (CRF Asian Study with Oral PGI2 derivative for Evaluating Improvement of Renal function) conducted in approximately 160 centers in China, Hong Kong, Japan, Malaysia, Republic of Korea, Taiwan, and Thailand. A total of 750 patients (n = 250 per group) with primary glomerular disease or nephrosclerosis were planned to be enrolled. Patients were randomized into one of three treatment groups in a double-bind, placebo-controlled manner: TRK-100STP 60 μg b.i.d.; TRK-100STP 120 μg b.i.d.; or placebo. The treatment period is planned to last 2 to 4 years. The primary efficacy endpoint is the renal composite endpoint including doubling of SCr and ESRD (dialysis induction, renal transplantation, or increase in SCr to ≥6.0 mg/dL).
This trial targeting CKD patients is designed to (a) demonstrate the superiority of TRK-100STP over placebo using renal composite endpoints, (b) determine the recommended clinical dose, and (c) assess the safety of TRK-100STP in this population and setting.
ClinicalTrials.gov Identifier: NCT01090037.
KeywordsProstacyclin analogue PGI2 Beraprost sodium Chronic kidney disease Primary glomerular disease Nephrosclerosis Serum creatinine Renal composite endpoint CASSIOPEIR TRK-100STP
The number of patients with end-stage renal disease (ESRD) requiring dialysis or renal transplantation has increased globally in recent years. Among the primary diseases that lead to ESRD are the primary and secondary glomerular diseases such as diabetic nephropathy and tubulointerstitial nephritis.
Primary glomerular diseases and nephrosclerosis still comprise a significant proportion of chronic kidney disease (CKD) patients. Primary glomerular diseases are especially important causes for the need for dialysis in Asian countries. They are currently the most frequent causes in China  and the second in most other Asian countries [2–4]. Nephrosclerosis is the third frequent cause in most Asian countries and has been increasing [1–5].
The primary care of CKD treatment is to delay renal function deterioration. Current treatments include dietary restriction and antihypertensive drug therapy. Angiotensin-converting enzyme inhibitors (ACEIs) and angiotensin-II receptor blockers (ARBs), which are often administered to both diabetic nephropathy and non-diabetic CKD patients, have been established as the recommended treatment agents for non-diabetic nephropathy patients , although either ACEIs or ARBs are insufficient for the prevention of progressive renal disease. Therefore, an additional treatment that is able to significantly delay the progression of CKD is highly coveted.
To meet this unmet medical need, clinical trials have been conducted attempting to delay CKD progression with combination therapies using renin-angiotensin system (RAS) inhibitors. Unfortunately, these trials failed to show an improvement in efficacy with composite renal endpoints while adverse events increase in some of them. Clinical benefits of combination treatments with multiple RAS inhibitors are therefore unproven, at least for diabetic nephropathy [7–10].
Furthermore, a recent trial of Nrf2-activating bardoxolone methyl in diabetic nephropathy patients (BEACON) was prematurely terminated due to safety concerns . A trial of an orally administered activated carbon preparation (AST120: Kremezin®), which is currently used in clinical practice for chronic renal failure in Japan, Republic of Korea and Taiwan, also failed to meet the efficacy endpoints in composite renal endpoint in the large EPPIC randomized controlled trials . The development of a novel CKD treatment strategy is therefore increasingly needed.
Beraprost sodium (BPS) is a stable orally-active prostacyclin (PGI2) analogue discovered by Toray Industries, Inc. to overcome instability of prostacyclin in vivo . BPS has a novel mechanism for suppressing the progression of CKD. This treatment also targets renal hypoxia, reflecting a growing body of evidence implicating this as a valid therapeutic approach . BPS has been found to be effective in various animal models of renal disorders [15–19]. In addition, BPS immediate-release tablets prevented the decrease in renal blood flow and function in patients with chronic renal failure [20, 21].
Using sustained release tablets of BPS (TRK-100STP), a randomized double-blind placebo-controlled comparative phase II trial aiming to determine the optimal clinical dose was conducted from 2005 to 2008 in Japanese patients with primary glomerular disease or nephrosclerosis as the primary disease . In this trial, serum creatinine (SCr) values were 1.5 to 4.5 for male and 1.3 to 4.0 for female at the initiation of treatment. Randomized patients received oral TRK-100STP 120 μg/day (60 μg b.i.d.), 240 μg/day (120 μg b.i.d.) or placebo for 28 weeks after the 22-week run-in period. The primary endpoint was the difference in slope of 1/SCr vs. time between the run-in period and the treatment period. No statistical difference in the primary endpoint was found between the high-dose (240 μg) group and the placebo group and so a clinical dose recommendation was not determined. Both treatment groups showed better outcomes than the placebo group, with the low-dose (120 μg/day) group showing the highest efficacy. Both active dose groups showed similar effectiveness for additional efficacy endpoints including creatinine clearance, SCr ratio and serum cystatin C, compared to those of the placebo group.
A subgroup analysis was also conducted in the same study among patients with SCr 2.0 mg/dL or higher, whose renal function deterioration was considered irreversible . Deteriorations in all the representative renal filtration functions (i.e. difference in the slope of the 1/SCr vs. time between the run-in period and the treatment period, SCr ratio, serum cystatin C and eGFR) were suppressed in the treatment groups and significant suppressions have been observed in some of these parameters. On the other hand, no clinically relevant safety issues were observed.
Based on these results, it was judged that a hypothesis could be set up to be verified in the phase IIb/III trial. The clinically recommended dose is to be re-evaluated using the same doses as ones in the phase II trial.
This paper details the design and methodology of a phase IIb/III trial (CASSIOPEIR: CRF Asian Study with Oral PGI2 derivative for Evaluating Improvement of Renal function) conceived on the basis of the evidence and findings mentioned above in order to investigate whether TRK-100STP is superior to placebo in treating patients with primary glomerular disease or nephrosclerosis. Evaluating composite renal endpoints, the trial aims also to determine a recommended therapeutic dose of TRK-100STP.
Aim of trial
This is a multicenter, randomized, double-blind, placebo-controlled, parallel-group comparative trial targeting CKD patients designed to: (a) demonstrate the superiority of TRK-100STP over placebo using renal composite endpoints, including the extension of the time to the start of dialysis treatment; (b) determine the recommended clinical dose by comparing the low-dose (120 μg/day), high-dose (240 μg/day), and placebo groups; and (c) assess the safety of TRK-100STP in this population and setting.
The trial is being conducted in approximately 160 sites, including centers in China, Hong Kong, Japan, Malaysia, Republic of Korea, Taiwan and Thailand. The protocol has been approved by the Ethics Review Committee/Institutional Review Board affiliated with each center. The trial is being conducted in accordance with Good Clinical Practice, and Declaration of Helsinki. All patients provided written informed consent. The trial has been registered on ClinicalTrials.gov, NCT01090037.
Prohibited and restricted concomitant medications
Prohibited Concomitant Medications
The following medications are prohibited for use during the study period.
(1) Prostaglandin drugs except for ophthalmic solutions and ointments.
(2) Fluorinated pyrimidine antifungal agents.
Restricted Concomitant Medications
(1) For ACEIs and ARBs, changing the dose or introducing the medication is not permitted from the obtaining of informed consent to the end of the study drug administration. Antihypertensive drugs other than ACEIs or ARBs are permitted to be used.
(2) From obtaining of informed consent to the end of the study drug administration, changing the dose or introducing the medication is not permitted for pentoxifylline, dilazep hydrochloride, or dipyridamole.
(3) From obtaining of informed consent to the end of the study drug administration, NSAIDs are not permitted to be taken for more than four consecutive weeks; and during the week prior to a visit, NSAIDs are not permitted to be taken.
The primary efficacy endpoint for the trial is the renal composite endpoint (time to first occurrence of one of the following events): 1) Doubling of SCr; defined as at least a two-fold increase in SCr during the treatment period over the baseline value during the run-in period (mean value of the last two measurement results during the run-in period); and 2) ESRD (occurrence of any of the following: introduction of dialysis, renal transplantation, or increase in SCr to ≥6.0 mg/dL). With regards to the doubling of SCr, and the increase in SCr to ≥6.0 mg/dL, a re-confirmation will be performed with blood sample collection and measurement four or more weeks after the initial date on which these endpoints were confirmed, and once reconfirmed, the initial date will be judged as the date on which these renal composite endpoints are reached. The clinical trial and administration of the study drug will be continued for the subject even after the confirmation that SCr has doubled or increased to ≥6.0 mg/dL until introduction of dialysis or renal transplantation is deemed necessary. If the administration of the study drug is prematurely discontinued during the treatment period, the clinical study will be continued as an efficacy follow-up until introduction of dialysis or renal transplantation is judged to be needed.
Secondary endpoints are as follows: 1) Renal composite endpoint or death (from any causes); 2) doubling of SCr; 3) ESRD; 4) introduction of dialysis; 5) renal transplantation; 6) increase in SCr to ≥6.0 mg/dL; 7) slope of 1/SCr vs. time; and 8) eGFR. In addition, the safety endpoints include adverse events, laboratory tests, vital signs and body weight, and 12-lead electrocardiogram (ECG). Also to be evaluated are miscellaneous efficacy endpoints such as “cardiovascular events or renal composite endpoints”.
All SCr values used for analysis of the endpoints are measured at the central clinical laboratory.
Subjects providing no data after administration of the study drug for the treatment period;
Subjects found not to fulfill the inclusion criterion (2) or (3);
Subjects found to meet the exclusion criterion (1), (2), or (6).
Subjects meeting the inclusion criteria;
Subjects not meeting the exclusion criteria;
Subjects providing three or more SCr measurement data points obtained at and after Week 4 of the treatment period (including at least one data point taken at Day 70 of the treatment period or later);
Subjects whose drug compliance rate is two-thirds or higher during the administration period of the study drug for the treatment period.
The safety analysis set (SAF) will include subjects taking at least one dose of the study drug for the treatment period.
Subjects taking at least one dose of the study drug for the treatment period;
Subjects providing at least one data point (sample) for plasma BPS concentration determination for which information on the date and time of blood collection and medication before the collection is available.
Handling of data
Data Handling Procedure #1
All data will be adopted for analysis that is obtained after the start of the administration of the study drug for the treatment period (Intension-To-Treat (ITT) analysis).
Data Handling Procedure #2
For subjects who discontinue the administration of the study drug for the treatment period, their data obtained after 3 months following the discontinuation will not be used, and data collection for them is censored at 3 months from the discontinuation or at completion of the study, whichever comes first (3-month lag censoring analysis).
Data Handling Procedure #3
Subjects that take a prohibited concomitant medication will be censored at the time of the medication. Subjects will be censored at any time when they stop taking the study drug for the treatment period, for whatever reason.
Analysis of efficacy
The primary population for efficacy analysis will be the FAS, and the data will be processed according to the Data Handling Procedure #1. Similar analyses will be conducted according to the Data Handling Procedure #2 in terms of FAS and according to the Data Handling Procedure #3 in terms of PPS. Statistical testing will use two-sided 5% significance level and calculate two-sided 95% confidence interval, unless otherwise specified.
Analysis of safety
Vital signs, adverse events, laboratory tests, body weight, 12-lead electrocardiogram (ECG) and pregnancy test will be performed for the purpose of safety evaluation.
Analysis of pharmacokinetics
Analysis of pharmacokinetics will be conducted using PKAS. During the treatment period the participants will make five visits prior to the study drug administration in the morning for a blood test. They will make another six visits after taking the morning dose to have blood samples collected. The time from the drug administration will be recorded, and the serum BPS level is to be determined. The population pharmacokinetics analysis will be conducted in addition to the pharmacokinetics analysis.
For the analysis of efficacy, the renal composite endpoint will be treated as an event and this evaluation will be conducted in the following steps. Step 1: Based on Cox’s proportional hazard model with the region as a covariate, contrast test will be performed on the comparison coefficient (1, -1/2, -1/2) for the placebo group, 120 μg group, and 240 μg group at two-sided 5% significance level. Step 2: If a statistical significance was observed in Step 1, pair-wise comparison between the placebo and the 120 μg groups and between the placebo group and the 240 μg group will be performed at a two-sided 5% significance level using Cox’s proportional hazard model with the region as a covariate.
Endpoint judgment committee
Prior to the start of the study, an Endpoint Judgment Committee (EJC) was established. The committee is comprised of three committee members who are not involved directly in the study. The committee will examine, particularly, the validity of dialysis introduction, renal transplantation and cardiovascular events, among the efficacy endpoints in each institution.
Data and safety monitoring board
Prior to the start of the study, the Data and Safety Monitoring Board (DSMB) was established. The committee is comprised of three committee members who are not involved directly in the study. The safety evaluation committee assesses safety data including serious adverse events.
The first patient was enrolled in this trial in June 8, 2010. A total of 1105 subjects were enrolled in run-in period. From July 8, 2010 through April 26, 2012 a total of 892 subjects underwent randomization (200 in China, 13 in Hong Kong, 339 in Japan, 46 in Malaysia, 135 in Republic of Korea, 108 in Taiwan and 51 in Thailand).
The EJC and DSMB have been conducted 2 and 3 times to date, respectively and have concluded that there is no concern regarding the continuation of this trial.
This is a multicenter, randomized, double-blind, placebo-controlled, parallel-group comparative trial targeting CKD patients designed to, (a) demonstrate the superiority of TRK-100STP over placebo using renal composite endpoints, (b) determine the recommended clinical dose, which was not established following the respective phase II trial, and (c) assess the safety of TRK-100STP in this population and setting.
Prostacyclin, which was discovered in 1976, was expected to be a key advance for novel pharmacotherapy for various cardiovascular diseases . However, prostacyclin proved to be an unstable chemical substance having a short elimination half-life in blood plasma. The clinical use of prostacyclin was consequently limited to serious cases of pulmonary arterial hypertension (PAH) for which 24-hour continuous infusion is indicated . BPS is a stable orally-active prostacyclin analogue and its immediate-release tablet obtained manufacturing approval for the treatment of chronic arterial occlusive diseases from the Japanese regulatory agency in January 1992 (brand names: Dornar® and Procylin®). An additional indication for primary pulmonary hypertension was approved in September 1999. Besides Japan, BPS immediate-release tablets were launched in other Asian markets including China, Indonesia, Republic of Korea, Thailand and The Philippines, between 1997 and 2006.
TRK-100STP, a hydrogel-forming matrix preparation, provides a sustained-release preparation of BPS . In October 2007, TRK-100STP was given marketing approval in Japan for the treatment of PAH with a maximum daily dose of 360 μg (180 μg b.i.d.) (Brand names: Careload® and Berasus®). The maximum daily clinical dose of TRK-100STP has doubled those of the immediate-release tablet for the indication of pulmonary hypertension in Japan.
BPS has the same pharmacological actions as those of natural prostacyclin, including anti-platelet and vasodilating effects , as well as being able to protect vascular endothelial cells  and inhibit inflammatory cytokines production including MCP-1 .
The importance of tubulointerstitial hypoxia has recently been highlighted as the final common pathway of CKD , a notion supported by an increasing body of evidence from animal models [14, 30, 31] and clinical study . Renal blood flow is reduced when renal glomeruli are damaged by pathological factors such as inflammation and hypertension. Lack of oxygen, particularly in the tubulointerstitium of the outer-medullary region which is susceptible to hypoxia, triggers further damage to renal glomeruli which causes renal function to progressively decline . It has been demonstrated, in the glomerular nephritis rat model, that the beneficial effects of BPS are attributed, at least in part, to the amelioration of tubulointerstitial hypoxia .
Prostacyclin is a vasodilator which, at a high dose, diminishes blood pressure or brings about increased heart rate (HR) as compensation in several animal species . However, neither increased HR nor lower blood pressure is observed at the clinical dose up to 180 μg b.i.d. in patients with PAH . Additionally, the phase II trial of CKD patients demonstrated that TRK-100STP up to 120 μg b.i.d. does not affect either blood pressure or urinary protein. Thus the effect of BPS to suppress the reduction of renal function is not related to blood pressure lowering or to reducing urinary protein levels. This suggests that the mechanism of beneficial effect of BPS for renal function is different from that of ACEIs/ARBs.
Treatment with TRK-100STP is employed, in principle, as an add-on to existing treatments. No limitation was set against concomitant ACEIs/ARBs use, although dose alternation and newly initiated prescription is restricted. Meanwhile recent evidence from large-scale clinical studies indicates that combination therapy with RAS inhibitors is not effective and also increases certain safety concerns in some of them. The add-on approach was therefore chosen in this trial, based on the observation that a new approach is required beyond RAS inhibitor-based combination therapy.
This trial utilizes carefully defined eligibility criteria that allows for sufficient numbers of events while excluding slow-progressing patients. This is important because the pace of renal function deterioration varies widely among patients, especially among non-diabetic CKD patients where disease progression is sometimes very slow. Enrollment is limited to patients with SCr of 2 mg/dL or higher where an irreversible decrease in renal function is reported . Clinical benefits were more clearly apparent in such patients in the previous phase II trial . Participants must also have experienced progression in renal function deterioration, assessed by the slope of 1/SCr vs. time, within one year before the start of the study. These aspects of recruitment may subsequently help us define the target population likely to benefit most from intervention.
The necessity of introduction of dialyses or kidney transplants were determined by the principal investigator based on medical need assessment. All endpoints including the dates of introduction of dialyses or kidney transplants, as well as cardiovascular event occurrence, were validated by an EJC whose members are third-party physicians.
Patients with diabetes at pre-enrollment were excluded. The findings of several animal model studies have indicated that BPS may be effective against diabetic nephropathy [35–37]. Researchers have also reported that BPS was effective in patients with microalbuminuria . However, there are several methodological difficulties in covering both diabetic and non-diabetic CKD in a single study protocol. In addition, considering there is a great unmet need for non-diabetic nephropathy treatment in Asia, we decided to prioritize and focus on non-diabetic CKD, wherein renal disorders are not modified by diabetes. As it is difficult in practice to definitively distinguish between patients with diabetic nephropathy and non-diabetic CKD patients with diabetes, all patients with diabetes at pre-enrollment are excluded.
In the original trial design, handling of primary data was stipulated as “3-month lag censoring analysis”. However, Japanese regulatory authority, Pharmaceuticals and Medical Devices Agency (PMDA), advised that ITT analysis should be primary analysis. The priority order of data handling was therefore amended based on the PMDA’s advice. Meanwhile, the sample size estimation and rationale for setting the sample size in “study design”, which was designed based on 3-month lag censoring analysis, was not amended.
This trial evaluates the efficacy and safety of TRK-100STP in the treatment of patients with primary glomerular disease or nephrosclerosis using renal composite endpoints, and also aims to establish a recommended dose of TRK-100STP to optimize clinical outcomes.
Endpoint judgment committee members
Akira Hishida (Chair), Enyu Imai, Masato Nakamura
Data and safety monitoring board members
Akira Saito (Chair), Masaki Kobayashi, Naoki Kashihara
This trial has been approved by competent regulatory authorities of China, Hong Kong, Japan, Malaysia, Republic of Korea, Taiwan and Thailand. In accordance with the laws of each country, the trial has been conducted after obtaining documented approval from Institutional Review Board/Independent Ethics Committee in each site according to ICH-GCP guidelines.
Masahiko Akai, Kazuhiro Kobayashi, Takeshi Matsugi, Akio Mori, Yoshitaka Mori of Toray provided assistance on the design of the protocol. Midori Ogasawara of Toray provided assistance on the preparation of the protocol and report. Satoshi Henmi of Toray, Hirotoshi Kakuta, Tomohisa Kawasaki and Hiroyuki Okumura of Astellas and Jun Kishi of MEDCORE ASSOCIATES Inc., provided assistance on the preparation of the report.
- Xie Y, Chen X: Epidemiology, major outcomes, risk factors, prevention and management of chronic kidney disease in China. Am J Nephrol. 2008, 28 (1): 1-7. 10.1159/000108755.View ArticlePubMedGoogle Scholar
- Akizawa T: Current Status of Dialysis Therapy and Related Clinical Guidelines in Japan. JMAJ. 2010, 53 (3): 185-187.Google Scholar
- Hwang SJ, Tsai JC, Chen HC: Epidemiology, impact and preventive care of chronic kidney disease in Taiwan. Nephrology (Carlton). 2010, 15 (Suppl 2): 3-9.View ArticleGoogle Scholar
- Jha V: Current status of chronic kidney disease care in southeast Asia. Semin Nephrol. 2009, 29 (5): 487-496. 10.1016/j.semnephrol.2009.06.005.View ArticlePubMedGoogle Scholar
- Jin DC: Current status of dialysis therapy in Korea. Korean J Intern Med. 2011, 26 (2): 123-131. 10.3904/kjim.2011.26.2.123.View ArticlePubMedPubMed CentralGoogle Scholar
- KDIGO: KDIGO 2012 clinical practice guideline for the evaluation and management of chronic kidney disease. Kid Int. 2013, 3 (1): 1-150.Google Scholar
- Investigators ONTARGET, Yusuf S, Teo KK, Pogue J, Dyal L, Copland I, Schumacher H, Dagenais G, Sleight P, Anderson C: Telmisartan, ramipril, or both in patients at high risk for vascular events. N Engl J Med. 2008, 358 (15): 1547-1559.View ArticleGoogle Scholar
- Imai E, Chan JC, Ito S, Yamasaki T, Kobayashi F, Haneda M, Makino H, ORIENT study investigators: Effects of olmesartan on renal and cardiovascular outcomes in type 2 diabetes with overt nephropathy: a multicentre, randomised, placebo-controlled study. Diabetologia. 2011, 54 (12): 2978-2986. 10.1007/s00125-011-2325-z.View ArticlePubMedPubMed CentralGoogle Scholar
- Fried LF, Emanuele N, Zhang JH, Brophy M, Conner TA, Duckworth W, Leehey DJ, McCullough PA, O'Connor T, Palevsky PM, Reilly RF, Seliger SL, Warren SR, Watnick S, Peduzzi P, Guarino P, VA NEPHRON-D Investigators: Combined Angiotensin inhibition for the treatment of diabetic nephropathy. N Engl J Med. 2013, 369 (20): 1892-1903. 10.1056/NEJMoa1303154.View ArticlePubMedGoogle Scholar
- Parving HH, Brenner BM, McMurray JJ, de Zeeuw D, Haffner SM, Solomon SD, Chaturvedi N, Persson F, Desai AS, Nicolaides M, Richard A, Xiang Z, Brunel P, Pfeffer MA, ALTITUDE Investigators: Cardiorenal end points in a trial of aliskiren for type 2 diabetes. N Engl J Med. 2012, 367 (23): 2204-2213. 10.1056/NEJMoa1208799.View ArticlePubMedGoogle Scholar
- de Zeeuw D, Akizawa T, Audhya P, Bakris GL, Chin M, Christ-Schmidt H, Goldsberry A, Houser M, Krauth M, Lambers Heerspink HJ, McMurray JJ, Meyer CJ, Parving HH, Remuzzi G, Toto RD, Vaziri ND, Wanner C, Wittes J, Wrolstad D, Chertow GM, BEACON Trial Investigators: Bardoxolone methyl in type 2 diabetes and stage 4 chronic kidney disease. N Engl J Med. 2013, 369 (26): 2492-2503. 10.1056/NEJMoa1306033.View ArticlePubMedPubMed CentralGoogle Scholar
- Schulman G, Berl T, Beck G, Remuzzi G, Ritz E: EPPIC (Evaluating Prevention of Progression In Chronic Kidney Disease): Results from phase III, Randomized, Placebo-controlled, double blind trials of AST-120 in adults with CKD. J Am Soc Nephrol. 2013, 24: 7B-10.1681/ASN.2012111093.View ArticleGoogle Scholar
- Ohno K, Nagase H, Matsumoto K, Nishiyama H, Nishio S: Stereoselective synthesis of 5,6,7-trinor-4,8-inter-m-phenylene-PGI2 derivatives and their inhibitory activities to human platelet aggregation.Adv Prostaglandin Thromboxane Leukot Res. 1985, 15: 279-281.PubMedGoogle Scholar
- Nangaku M: Chronic hypoxia and tubulointerstitial injury: a final common pathway to end-stage renal failure. J Am Soc Nephrol. 2006, 17 (1): 17-25.View ArticlePubMedGoogle Scholar
- Utsunomiya Y, Ogura M, Kawamura T, Mitarai T, Maruyama N, Sakai O: Attenuation of immune complex nephritis in NZB/WF1 mice by a prostacyclin analogue. Clin Exp Immunol. 1995, 99 (3): 454-460.View ArticlePubMedPubMed CentralGoogle Scholar
- Kushiro M, Shikata K, Sugimoto H, Shikata Y, Miyatake N, Wada J, Miyasaka M, Makino H: Therapeutic effects of prostacyclin analog on crescentic glomerulonephritis of rat. Kidney Int. 1998, 53 (5): 1314-1320. 10.1046/j.1523-1755.1998.00881.x.View ArticlePubMedGoogle Scholar
- Yamada M, Sasaki R, Sato N, Suzuki M, Tamura M, Matsushita T, Kurumatani H: Amelioration by beraprost sodium, a prostacyclin analogue, of established renal dysfunction in rat glomerulonephritis model. Eur J Pharmacol. 2002, 449 (1–2): 167-176.View ArticlePubMedGoogle Scholar
- Yamaguchi S, Inada C, Tamura M, Sato N, Yamada M, Itaba S, Okazaki S, Matsuura H, Fujii S, Matsuda F, Goto Y, Mochizuki H, Kurumatani H, Miyamoto M: Beraprost sodium improves survival rates in anti-glomerular basement membrane glomerulonephritis and 5/6 nephrectomized chronic kidney disease rats. Eur J Pharmacol. 2013, 714 (1–3): 325-331.View ArticlePubMedGoogle Scholar
- Yamaguchi S, Goto Y, Sato N, Kurumatani H, Miymoto M, Yamada M: Beraprost Sodium Suppresses Progression of Chronic Renal Failure by Protecting Renal Capillary Endothelial Cells and Improving Renal Hypoxia in Glomerulonephritis Rats. J Am Soc Nephrol. 2013, 24: 868A-10.1681/ASN.2013040417.View ArticleGoogle Scholar
- Fujita T, Fuke Y, Satomura A, Hidaka M, Ohsawa I, Endo M, Komatsu K, Ohi H: PGl2 analogue mitigates the progression rate of renal dysfunction improving renal blood flow without glomerular hyperfiltration in patients with chronic renal insufficiency. Prostaglandins Leukot Essent Fatty Acids. 2001, 65 (4): 223-227. 10.1054/plef.2001.0315.View ArticlePubMedGoogle Scholar
- Ishida A, Hotta O, Takuma T: Clinical efficacy of PGI2 derivative (BPS) in patients with progressive renal disease. Jpn J Nephrol. 2003, 45 (3): 276-Google Scholar
- Fujita T, Koyama A, Gejo F, Origasa H, Isono M, Kiriyama T: Sustained-release tablets of orally-active prostacyclin analogue, beraprost sodium, for patients with non-diabetic chronic renal failure. J Am Soc Nephrol. 2011, 22: 427A-Google Scholar
- Tomino Y: Point of no return in IgA nephropathy. In study research on progressive renal disorder, Research on measures for intractable diseases. Health and Labour Sciences Research Grants. Comprehensive report and individual reports about each shared in 2003 fiscal year. 2004, 167-172.Google Scholar
- Moncada S, Gryglewski R, Bunting S, Vane JR: An enzyme isolated from arteries transforms prostaglandin endoperoxidases to an unstable substance that inhibits platelet aggregation. Nature. 1976, 263: 663-665. 10.1038/263663a0.View ArticlePubMedGoogle Scholar
- Barst RJ, Rubin LJ, Long WA, McGoon MD, Rich S, Badesch DB, Groves BM, Tapson VF, Bourge RC, Brundage BH, Koerner SK, Langleben D, Keller CA, Murali S, Uretsky BF, Clayton LM, Jöbsis MM, Blackburn SD, Shortino D, Crow JW, Primary Pulmonary Hypertension Study Group: A comparison of continuous intravenous epoprostenol (prostacyclin) with conventional therapy for primary pulmonary hypertension. N Engl J Med. 1996, 334: 296-301. 10.1056/NEJM199602013340504.View ArticlePubMedGoogle Scholar
- Kurumatani H: Pharmacological profiles and clinical effects of oral sustained release beraprost sodium (Careload LA tablets 60 µg, Berasus LA tablets 60 µg). Nihon Yakurigaku Zasshi. 2009, 133 (2): 101-111. 10.1254/fpj.133.101.View ArticlePubMedGoogle Scholar
- Nishio S, Matsuura H, Kanai N: The in vitro and ex vivo antiplatelet effect of TRK-100, a stable prostacyclin analog, in several species. Jpn J Pharmacol. 1988, 47: 1-10. 10.1254/jjp.47.1.View ArticlePubMedGoogle Scholar
- Sakai A, Yajima M, Nishio S: Cytoprotective effect of TRK-100, a prostacyclin analogue, against chemical injuries in cultured human vascular endothelial cells. Life Sci. 1990, 47 (8): 711-719. 10.1016/0024-3205(90)90626-3.View ArticlePubMedGoogle Scholar
- Fine LG, Bandyopadhay D, Norman JT: Is there a common mechanism for the progression of different types of renal diseases other than proteinuria? Towards the unifying theme of chronic hypoxia. Kidney Int Suppl. 2000, 75: S22-S26.View ArticlePubMedGoogle Scholar
- Eckardt KU, Bernhardt WM, Weidemann A, Warnecke C, Rosenberger C, Wiesener MS, Willam C: Role of hypoxia in the pathogenesis of renal disease. Kidney Int Suppl. 2005, 99: S46-S51.View ArticlePubMedGoogle Scholar
- Kang DH, Kanellis J, Hugo C, Truong L, Anderson S, Kerjaschki D, Schreiner GF, Johnson RJ: Role of the microvascular endothelium in progressive renal disease. J Am Soc Nephrol. 2002, 13 (3): 806-816.PubMedGoogle Scholar
- Inoue T, Kozawa E, Okada H, Inukai K, Watanabe S, Kikuta T, Watanabe Y, Takenaka T, Katayama S, Tanaka J, Suzuki H: Noninvasive evaluation of kidney hypoxia and fibrosis using magnetic resonance imaging. J Am Soc Nephrol. 2011, 22 (8): 1429-1434. 10.1681/ASN.2010111143.View ArticlePubMedPubMed CentralGoogle Scholar
- Mimura I, Nangaku M: The suffocating kidney: tubulointerstitial hypoxia in end-stage renal disease. Nat Rev Nephrol. 2010, 6 (11): 667-678. 10.1038/nrneph.2010.124.View ArticlePubMedGoogle Scholar
- Kunieda T, Nakanishi N, Matsubara H, Ohe T, Okano Y, Kondo H, Nishimura M, Shirato K, Tanabe N, Homma S, Yoshida S, Inokuma S, Kodama M, Koike T, Hishida H: Effects of long-acting beraprost sodium (TRK-100STP) in Japanese patients with pulmonary arterial hypertension. Int Heart J. 2009, 50 (4): 513-529. 10.1536/ihj.50.513.View ArticlePubMedGoogle Scholar
- Wang LN, Tang Z, Shou I, Fukui M, Tomino Y: Effects of the PGI2 analog beraprost sodium on glomerular prostanoid synthesis in rats with streptozotocin-induced diabetes. Nephron. 1996, 73 (4): 637-643.PubMedGoogle Scholar
- Watanabe M, Nakashima H, Mochizuki S, Abe Y, Ishimura A, Ito K, Fukushima T, Miyake K, Ogahara S, Saito T: Amelioration of diabetic nephropathy in OLETF rats by prostaglandin I2 analog, beraprost sodium. Am J Nephrol. 2009, 30 (1): 1-11. 10.1159/000195722.View ArticlePubMedGoogle Scholar
- Sato N, Kaneko M, Tamura M, Kurumatani H: The prostacyclin analog beraprost sodium ameliorates characteristics of metabolic syndrome in obese Zucker (fatty) rats. Diabetes. 2010, 59 (4): 1092-1100. 10.2337/db09-1432.View ArticlePubMedPubMed CentralGoogle Scholar
- Owada A, Suda S, Hata T: Effect of long-term administration of prostaglandin I2 in incipient diabetic nephropathy.Nephron. 2002, 92 (4): 788-796. 10.1159/000065445.View ArticlePubMedGoogle Scholar
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2369/15/153/prepub
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