Antihypertensive Effect of Rostafuroxin Compared With Losartan in Hypertensive Patients Bearing Specified Gene Mutations
|The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.|
|ClinicalTrials.gov Identifier: NCT01320397|
Recruitment Status : Unknown
Verified March 2011 by RostaQuo S.p.A..
Recruitment status was: Not yet recruiting
First Posted : March 22, 2011
Last Update Posted : March 23, 2011
|Condition or disease||Intervention/treatment||Phase|
|Essential Hypertension||Drug: Rostafuroxin Drug: Losartan||Phase 2|
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About 30% of the world adult population is affected by hypertension in industrialised countries. Elevated arterial pressure is the major cause of cardiovascular mortality and international guidelines emphasise the benefits of reducing blood pressure. The current antihypertensive strategies may reduce by 20-30% the cardiovascular risk of hypertensive patients when this efficacy is measured in clinical trials in comparison with placebo. A precise world-wide estimation of this efficacy both in term of patient burden and healthcare costs is not available; however, a recent analysis suggests that the world-wide cost of hypertension associated cardiovascular complications is around 1,000 billions dollars. Therefore, effective improvement in the diagnosis and treatment of hypertension can provide the most significant contribution to the decrease of cardiovascular mortality and reduction of the world-wide costs associated to treatment of hypertension complications.
Most of clinical trials, performed with the aim to show a reduction of the systolic blood pressure in hypertensive patients, show that reduction of systolic blood pressure is independent from the class of tested drugs as diuretics, β blockers, Ca channel blockers or inhibitors of RAS seem to have roughly the same efficacy. These findings have been used as an argument to support the notion that the antihypertensive therapy efficacy in reducing cardiovascular risk depends on the magnitude of the blood pressure fall rather than on the mechanism of action of the drug. This view contrasts with the well established notion that the secondary prevention capacity in other cardiovascular diseases differs among these classes of drugs with minor difference on the prevention of heart failure or stroke between the Ca antagonist and the other classes of drugs.
Furthermore, the recent findings on genetic of hypertension taken together with the previous data on pathophysiology of hypertension and its cardiovascular complications are consistent with the notion that a variety of heterogeneous genetic-molecular mechanisms concur to develop the rather uniform clinical picture of primary hypertension. Drugs are small molecules that produce their effects by interacting with larger molecules (proteins) whose function or reactivity may vary from one patient to another because the variations within the gene encoding them. Therefore, it is logical to postulate that the consequence of this different interaction either in term of blood pressure reduction or cardiovascular risk prevention may vary from a patient to another according to the peculiar function of the proteins involved in a given patient.
Rostafuroxin was selected during a research program aimed to synthesizing and selecting new antihypertensive compounds able to interfere with abnormalities in Na tubular reabsorption due to humoral and/or genetic mechanisms leading to essential (or genetic) hypertension. Many studies performed on the Milan hypertensive strain of rats (MHS), bearing a primary renal alteration in the ability to excrete sodium and increased blood pressure levels, showed a clear capacity of Rostafuroxin to revert these alteration, reducing systemic blood pressure.
Rostafuroxin selectively interferes with the Na-K pump correcting its functional abnormalities without interfering with other receptors involved in blood pressure regulation or hormonal homeostasis. At nanomolar concentration, rostafuroxin reduces the Na-K pump hyperactivation induced in renal cell cultures by either incubation with nanomolar ouabain concentrations or cell transfection with the 'hypertensive' variant of adducin.
Similarly, less than 1 μg/kg os of rostafuroxin is able to completely normalize both blood pressure and the increased renal Na-K pump activity in rats made hypertensive by a chronic infusion of low-dose ouabain. The antihypertensive effect of rostafuroxin is long-lasting since it is still present 24 hours after oral administration. It is not associated with changes in heart rate. Moreover, the long-term antihypertensive activity of rostafuroxin is not associated with alterations of plasma potassium, RAAS, insulin resistance, plasma lipid profile and uricemia. These findings indicate that the normalization of renal sodium handling brought about by this compound is not accompanied by the typical side effects of diuretics, such as: hypokaliemia, increased plasma levels of renin, aldosterone, triglycerides and uric acid, or insulin resistance.
Increased levels of EO and the mutated adducin are both associated with the organ complications related to hypertension, namely cardiac hypertrophy and progression toward renal insufficiency. Cardiac and renal hypertrophy is induced in rats by chronic ouabain infusion. Rostafuroxin prevents the ouabain-induced organ hypertrophy.
Rostafuroxin has shown a high safety ratio in toxicological studies and was well tolerated in previous clinical trials.
Patients with mutated adducin and increased EO plasma levels share many functional, hormonal and biochemical characteristics with MHS rats, therefore Rostafuroxin could become a first choice treatment in such patients bearing specific gene mutations and presenting high arterial blood pressure levels.
Preliminary proof of concept studies have shown ability of Rostafuroxin to reduce arterial blood pressure levels in such a patients.
|Study Type :||Interventional (Clinical Trial)|
|Estimated Enrollment :||240 participants|
|Intervention Model:||Parallel Assignment|
|Masking:||Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)|
|Official Title:||Antihypertensive Effect of Different Doses of Rostafuroxin in Comparison With Losartan, Assessed by Office and Ambulatory Blood Pressure Monitoring in a Hypertensive Population Selected According to a Specific Genetic Profile|
|Study Start Date :||May 2011|
|Estimated Primary Completion Date :||July 2012|
|Estimated Study Completion Date :||December 2012|
Experimental: Rostafuroxin 6 micrograms capsules
1 capsule of ROSTAFUROXIN (6 micrograms) once a day before breakfast.
6 microgram capsules
Other Name: PST2238
Experimental: Rostafuroxin 50 micrograms capsules
1 capsule of ROSTAFUROXIN (50 micrograms) once a day before breakfast.
50 micrograms capsules
Other Name: PST2238
Experimental: Rostafuroxin 500 micrograms
1 capsule of ROSTAFUROXIN (500 micrograms) once a day before breakfast.
500 micrograms capsules
Other Name: PST2238
Experimental: Losartan 50 mg encapsulated
1 capsule containing one cpr of Losartan 50 mg once a day before breakfast.
Losartan 50 mg once a day
Other Name: Losaprex
- Systolic Blood Pressure [ Time Frame: Week 9 of treatment versus baseline ]
Automated sitting and standing SBP and DBP will be recorded by physician at baseline (two visits) and at week 2, 5 and 9 of treatement.
sitting: after the patient has rested for at least 10 minutes in a quiet room. There are five consecutive sitting BP readings with a 30 to 60 seconds interval between the readings; the mean of the last three sitting BP will be used.
The standing BP is measured twice immediately after the patient assumed the standing position.
- Diastolic blood pressure [ Time Frame: Baseline (two visits) and then at week 2, 5 and 9 of treatment ]Diastolic blood pressure measurements will be performed at the same times of the systolic blood pressure measurements, as described above.
- Trough-to-peak ratio on Systolic Blood Pressure [ Time Frame: Throughout 24 hours ABPM ]Ambulatory Blood Pressure Monitoring (ABPM)will be performed throuhgout 24 hours at baseline and at week 9 of treatement. Readings will be Centralized. The Core Laboratory will be in charge for data interpretation.
- Number of participants with adverse events [ Time Frame: throughout all the study period and follow-up (30 days) ]All the Adverse Events will be recorded and followed-up till their resolution. Number of Adverse Events in each group treatment will be computed, including single event frequencies and number of patients with adverse events. AEs will be collected on spontaneous reporting by patients and a number of standard safety procedure: i.e. recording of ECGs, standard blood chemistry and haematology, performed before, during and at the end of the treatment period.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01320397
|Contact: Giovanni Valentini, MD||+39 06 firstname.lastname@example.org|
|Contact: Vittorio Dainese, Biologist||+39 06 email@example.com|
|Ballinasloe, Galway, Ireland|
|James Connolly memorial Hospital|
|Dublin, Ireland, 15|
|Clinical research centre, Beaumont Hospital|
|Dublin, Ireland, 9|
|Unità Operativa di Nefrologia e Dialisi, Ospedale "S. Maria della Scaletta"|
|Imola, Bologna, Italy, 40026|
|Ospedale "Santa Maria"|
|Borgo Val di Taro, Parma, Italy, 43023|
|Divisione di Cardiologia e UTIC Ospedale "Marianna Giannuzzi"|
|Manduria, Taranto, Italy, 74024|
|Reparto di Emodialisi, Ospedale dell'Angelo|
|Mestre, Venezia, Italy, 30174|
|U.O. di Nefrologia e Dialisi, Ospedale San Donato|
|Arezzo, Italy, 52100|
|U.O Nefrologia, Dialisi e Ipertensione, Policlinico S. Orsola-Malpighi|
|Bologna, Italy, 40138|
|Cattedra di Medicina Interna, U.O. Malattie Cardiovascolari, Policlinico Universitario Campus Germaneto|
|Catanzaro, Italy, 88100|
|Centro per l'Ipertensione, Ospedale F. Veneziale|
|Isernia, Italy, 86170|
|U.O.C. di Medicina Interna Universitaria 1, Ospedale San Salvatore|
|L'Aquila, Italy, 67100|
|U.O. Nefrologia e Dialisi, Spedali Riuniti|
|Livorno, Italy, 57100|
|Divisione di Nefrologia, Dialisi e Ipertensione Ospedale San Raffaele|
|Milano, Italy, 20132|
|U.O. Nefrologia e Dialisi, Università degli Studi di Milano Azienda Ospedaliera San Paolo|
|Milano, Italy, 20142|
|Clinica Medica 3, Dipartimento di Scienze Mediche e Chirurgiche|
|Padova, Italy, 35128|
|Reparto Emodialisi, Clinica "Domus Nova"|
|Ravenna, Italy, 48100|
|Nefrologia e Dialisi, Ospedale Infermi|
|Rimini, Italy, 47900|
|Centro per l'Ipertensione, A.S.L. n° 1|
|Sassari, Italy, 07100|
|U.O. Nefrologia e Dialisi Presidio Ospedaliero "Giuseppe Mazzini"|
|Teramo, Italy, 64100|
|Centro Ipertensione Arteriosa, SCU Medicina Interna 4, A.O.U. San Giovanni Battista|
|Torino, Italy, 10126|
|Institute of Cardiology, Department of Coronary Disease, Jagiellonian University|
|Krakow, Poland, 31-202|
|Institute of Cardiology, I Department of Cardiology and Hypertension, Jagiellonian University|
|Krakow, Poland, 31-501|
|Internal Medicine and Gerontology, Jagiellonian University Medical College|
|Krakow, Poland, 31-501|
|Institute of Cardiology, Department of Hypertension, University of Medical Sciences|
|Poznan, Poland, 01-848|
|The Cardinal Stefan Wyszynski Institute of Cardiology - Arterial Hypertension Clinic|
|Warsaw, Poland, 04-628|
|Study Chair:||Jan A Staessen, MD PhD||Laboratory of Hypertension, University of Leuven, B-3000 Leuven - BELGIUM|