Abstract
Aprocitentan (ACT-132577) is an orally active, dual endothelin-1 (ET-1) receptor antagonist that prevents the binding of ET-1 to both ETA/ETB receptors. It is an active metabolite of macitentan (obtained by oxidative depropylation), an orphan drug used for the treatment of pulmonary arterial hypertension. Aprocitentan is highly bound to plasma proteins and is eliminated in both urine and feces. It is well tolerated across all doses (up to 600 mg with single dose and 100 mg once a day at multiple doses). Its pharmacokinetic profile shows a half-life of 44 h, fitting a once-daily dosing regimen with plasma ET-1 concentrations (reflecting ET receptor antagonism), significantly increasing with doses ≥ 25 mg. Only minor differences in exposure between healthy females and males, healthy elderly and adult subjects, fed and fasted conditions, and renal function have been observed. Aprocitentan in patients with resistant hypertension is currently under investigation in the PRECISION phase III trial (ClinicalTrials identifier: NCT03541174). Nonetheless, results of pre-clinical data and studies in humans support the potential role of aprocitentan in this clinical setting. The absolute blood pressure (BP) reductions with aprocitentan are in the ranges established as a surrogate for reduction in cardiovascular morbidity in hypertension. Significant changes in BP with aprocitentan are observed within 14 days, and its BP-lowering effects have also been documented with ambulatory BP monitoring. Finally, aprocitentan enhances the BP-lowering effects of other antihypertensive drugs, including renin-angiotensin-system blockers. In conclusion, aprocitentan ameliorates the effects of ET-1 and could potentially reduce BP and provide broader cardiovascular protection in patients with resistant hypertension. Available data support the hypothesis that this new agent could expand our antihypertensive arsenal in resistant hypertension, making aprocitentan an attractive candidate for further large-scale trials.
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Endothelin-1 is the most potent endogenous vasoconstrictor currently available and is implicated in the pathogenesis of hypertension. |
Aprocitentan, the active metabolite of macitentan, is a potent, orally active, dual endothelin receptor antagonist and represents a potential novel therapy for hypertensive patients. |
Aprocitentan enhances the blood pressure-lowering effects of other antihypertensive drugs with additional potential long-term benefits. |
Blocking the actions of endothelin-1 by aprocitentan could potentially reduce blood pressure and provide broader cardiovascular protection to patients with resistant hypertension. |
Introduction
Endothelin-1 (ET-1) regulates vascular tone and blood pressure (BP) and contributes to the pathogenesis of hypertension [1,2,3]. It is a potent vasoconstrictor peptide that causes neurohormonal and sympathetic activation, hypertensive end-organ damage (including vascular hypertrophy and remodeling), fibrosis, endothelial dysfunction and increased aldosterone synthesis and secretion [4]. Both animal and human model studies have shown that vascular ET-1 expression is increased in hypertension [1,2,3].
Aprocitentan (ACT-132577; Fig. 1) is a potent, orally active, dual ET receptor antagonist that prevents the binding of ET-1 to both ETA/ETB receptors, with an inhibitory potency ratio of 1:16 [5,6,7]. It is a member of the class of sulfamides in which one of the amino groups of sulfonamide is substituted by a 5-(4-bromophenyl)-6-{2-[(5-bromopyrimidin-2-yl)oxy]ethoxy}pyrimidin-4-yl group [5,6,7]. Aprocitentan is an active metabolite of macitentan (obtained by oxidative depropylation), an orphan drug used for the treatment of pulmonary arterial hypertension [5,6,7].
Aprocitentan causes a a dose-dependent decrease in BP and has been shown to have a synergistic effect with renin-angiotensin-system (RAS) blockers. As such, it represents a potential new treatment modality when high BP cannot be adequately controlled by currently available treatments [4].
The main aims of our review were to (1) summarize the pharmacokinetic properties of aprocitentan, (2) analyze the results of clinical studies investigating the safety and efficacy of this drug for the treatment of hypertension and (3) evaluate future directions that could establish the role for aprocitentan in the treatment of resistant hypertension.
For this purpose, literature searches were conducted using PubMed, Scopus, Web of Science, together with the ClinicalTrials.gov database. We selected influential clinical studies in the field of hypertension using research Methodology Filters [8, 9]. In brief, we used the following search terms: “aprocitentan, endothelin, pharmacology, pharmacokinetics, phaarmacodynamics, hypertension, blood pressure, efficacy and safety”. We also performed hand-searching of conference proceedings, pharmaceutical industry files and personal communication from experts in the field, to identify any other relevant study.
No language restriction was applied to the inclusion of articles included in this review.
This article is based on previously conducted studies and does not contain any new studies with human participants or animals performed by any of the authors.
ET-1 and resistant hypertension
Endothelin-1 is a 21-amino acid peptide predominantly produced by endothelial cells. Its production by these endothelial cells increases in response to several stimuli, including hypoxia, shear stress, angiotensin II, glucose and inflammatory cytokines [10,11,12]. It acts in a paracrine manner, producing a powerful vasoconstrictor effect, and exhibits remarkably long-lasting actions [2, 3, 13,14,15,16]. ET-1 causes endothelial dysfunction and vascular and cardiac remodeling and also contributes to sodium and water regulation in the kidney [2,3,4, 13, 17, 18]. In patients with severe hypertension, ET-1 expression in the endothelium is enhanced, and it plays a role in BP elevation and in the pathogenesis of vascular hypertrophy [14]. The ET system is also upregulated in patients with salt-sensitive hypertension, diabetes, obesity and chronic kidney disease [19]. Experimental models have shown that ET receptor antagonists may prevent and sometimes reverse tissue alterations in an organ-specific manner, leading to long-term benefits [5, 19,20,21]. It has been also suggested that such benefits may be independent of the hemodynamic effect of therapy [19].
Thus, the involvement of ET system in volume-dependent hypertension, end-organ damage and comorbidities associated with hypertension [19,20,21] supports the use of the ET-1 receptor antagonist as a new pharmacological strategy in the treatment of resistant hypertension. In addition, although the use of ET receptor antagonists is tempered by a significant adverse side effect profile, including an increase in total body sodium [22, 23], available data show that both selective and mixed antagonists increase forearm vasodilatation and reduce BP in hypertensive patients [24].
The first clinical study in humans to investigate ET antagonism administered the mixed receptor antagonist bosentan as a single agent to patients with mild to moderate primary hypertension [25]. Specifically, 293 patients with mild-to-moderate essential hypertension were randomly assigned to receive one of four oral doses of bosentan (100, 500 or 1000 mg once daily or 1000 mg twice daily), placebo or a renin-angiotensin-system (RAS) blocker (enalapril 20 mg once daily) for 4 weeks. Compared with placebo, bosentan resulted in a significant reduction in diastolic BP with a daily dose of 500 or 2000 mg (an absolute reduction of 5.7 mmHg at each dose). A similar reduction in diastolic BP was documented between the enalapril (5.8 mm Hg) and bosental arms [25].
More recently, a randomized, double-blind, placebo-controlled forced dose-titration study evaluated darusentan (an ET-1 selective antagonist) as an add-on therapy in patients with resistant hypertension [26]. Overall, 115 patients with resistant hypertension who were receiving background therapy with at least three antihypertensive medications, including a diuretic, at full doses were randomized 2:1 to increasing doses of darusentan (10, 50, 100, 150 and 300 mg) or matching placebo once daily for 10 weeks. There was a progressive decline in systolic/diastolic BP throughout the study, with the largest reductions observed at week 10 (300 mg dose: systolic BP reduction 11.5 mmHg, diastolic BP reduction 6.3 mmHg) [26].
Similar results were also obtained by Weber and co-workers in a randomized, double-blind study enrolling 379 patients with resistant hypertension [27].
Conversely, in a clinical trial recruiting 849 patients with resistant hypertension, patients in the darusentan and placebo arms showed a similar decrease in office systolic BP [28]. Due to this negative outcome, further studies into the chronic administration of darusentan in resistant hypertension were terminated.
Pharmacodynamic and pharmacokinetics
Aprocitentan is highly bound to plasma proteins and is eliminated in both urine and feces [29]. Single- and multiple-dose tolerability, safety, pharmacokinetics, and pharmacodynamics of aprocitentan up to 600 mg (single doses) and 100 mg once a day (multiple doses) have been investigated in healthy male and female subjects [7]. Overall, aprocitentan was well tolerated across all doses. Of note, plasma concentration–time profiles of aprocitentan are similar after single- and multiple-dose administration. Its pharmacokinetic profile shows a half-life of 44 h, fitting a once-daily dosing regimen with plasma ET-1 concentrations (reflecting ET receptor antagonism), significantly increasing with doses ≥ 25 mg. Accumulation at steady state, reached by day 8, was threefold. Only minor differences in exposure between healthy females and males, healthy elderly and adult subjects, fed and fasted conditions, and renal function were observed [5,6,7, 29].
Just recently, a double-blind study including 20 healthy male and female subjects showed that pharmacokinetics of aprocitentan did not differ significantly between Japanese and Caucasian patients. Specifically, results documented that maximum plasma concentration was reached at 4 and 3 h, and elimination half-life was 49.1 and 48.8 h for Japanese and Caucasian subjects, respectively. The accumulation index was around 3 for both populations. Aprocitentan was safe and well tolerated in both groups [30].
Drug interactions
Some drug interactions with aprocitentan have been tested (midazolam, rosuvastatin, and RAS blockers) [4, 6, 31]. No significant drug-to-drug interactions have been reported to date.
Trensz and co-workers investigated the pharmacology of aprocitentan on BP and renal function in two models of experimental hypertension (low-renin model and normal-renin model), comparing the effect of its combination with RAS blockers (valsartan and enalapril) with that of the combination of the mineraloreceptor antagonist spironolactone with the same RAS blockers. Briefly, aprocitentan was synergistic with valsartan and enalapril in decreasing BP in both experimental models. Of note, in hypertensive rats under sodium restriction and receiving enalapril, the addition of aprocitentan further decreased the BP without causing renal impairment, in contrast to spironolactone [4].
The drug–drug interaction of aprocitentan and rosuvastatin was investigated in a single-center, open-label, single-sequence study. Twenty healthy male subjects received a single dose of 10 mg rosuvastatin on days 1 and 13 followed by pharmacokinetic and tolerability assessments for up to 120 h. From day 5 to day 17, subjects received 25 mg of aprocitentan once daily. At steady state, aprocitentan did not significantly affect the pharmacokinetics of rosuvastatin, and the combination of rosuvastatin and aprocitentan was well tolerated [31].
Finally, the pharmacokinetics of midazolam in the absence and presence of aprocitentan (loading dose of 150 mg followed by 50 mg once daily) was investigated in 19 healthy male subjects. The pharmacokinetics and tolerability of midazolam and its metabolite 1-hydroxy midazolam were assessed over a 24-h period after each midazolam administration. At steady state, aprocitentan did not affect the area under the plasma concentration–time curve and the maximum plasma concentration of midazolam and 1-hydroxy midazolam. There were no relevant differences in tolerability parameters between treatments [6].
Of note, the main elimination pathways of aprocitentan are through glucosidation to metabolite M3 by uridine 5′-diphospho-glucuronosyltransferases 1A1 and 2B7 and mostly chemical hydrolysis to metabolite M1. These pathways are independent of cytochrome P450 enzymes and, consequently, aprocitentan would have limited potential for drug interactions with drugs that induce or inhibit cytochrome P450 enzymes [6, 31].
Clinical studies in hypertension
To date, three clinical studies in the setting of hypertension have been registered. The first, PRECISION trial, has the aim to evaluate the BP-lowering effect of aprocitentan when added to other antihypertensive drugs in patients with resistant hypertension; this trial is still recruiting (Table 1).
The second had the purpose to evaluate the BP-lowering effect of aprocitentan when added to the background antihypertensive therapy in patients with uncontrolled BP and chronic kidney disease. Unfortunately, a non-medical decision was made to not initiate this study.
Thus, to date, only a double-blind, parallel study has been completed with the specific aim to evaluate the dose–response of aprocitentan (once-daily oral regimen of 4 doses) on systolic and diastolic BP in participants with grade 1 or 2 essential hypertension [32]. Participation in this study was planned to last up to 18 weeks. After a single-blind placebo run-in period of 4–6 weeks, participants were randomized to a double-blind treatment period of 8 weeks and a washout and follow-up period ending with an end-of-study visit approximately 12 weeks after randomization. Overall, 490 eligible patients with a sitting diastolic BP of 90–109 mmHg were randomized to aprocitentan 5, 10, 25, or 50 mg, placebo or lisinopril 20 mg. Briefly, aprocitentan 10, 25 and 50 mg significantly decreased sitting systolic/diastolic unattended office BP from baseline to week 8 (placebo-corrected decreases in systolic/diastolic BP: 7.05/4.93, 9.90/6.99 and 7.58/4.95 mmHg, respectively), compared with an unattended office BP reduction of 4.84/3.81 mmHg with lisinopril 20 mg. Protocol control rates at the end of the double-blind treatment period based on sitting systolic BP < 140 mmHg (mean of 5 measurements with an automatic unattended office BP measurement device) are shown in Fig. 2 [32]. Briefly, control rates ranged from 56.5% for lisinopril to 69.1% for aprocitentan 50 mg (1 capsule once daily in the morning) [32]. Of note, the maximum effect was reached at a dose of about 30 mg, and half of the effect was reached at a dose of about 10 mg, with a plateauing of the dose–response between 25 and 50 mg. Furthermore, aprocitentan was not associated with the activation of the neurohumoral system [32]. Interestingly, ambulatory BP monitoring (ABPM) was performed at baseline and at week 8. Systolic and diastolic BP was measured every 20 min from 06:00 h to 23:00 h and every 30 min from 23:00 h to 06:00 h. Compared to placebo, aprocitentan doses of 10, 25, and 50 mg lowered mean 24-h systolic/diastolic BP from baseline by 3.99/4.04, 4.83/5.89 and 3.67/4.45 mmHg, respectively [32]. Incidence of main adverse events was similar in the aprocitentan groups and the placebo group (Table 2) [32].
Conclusion
Endothelin-1 is the most potent endogenous vasoconstrictor currently known and is implicated in the pathogenesis of hypertension [2, 3, 13, 17, 18]. In addition, ET-1 overexpression in the endothelium may contribute to severe BP elevation [14].
ET-1 is involved in the pathogenesis of endothelial dysfunction, promoting the development and progression of resistant hypertension [33]. Indeed, endothelial dysfunction is associated with a shift toward reduced vasodilation, is recognized to be a key early determinant in progression to atherosclerosis, and is now well established as being independently associated with increased arterial stiffness [33, 34]. Experimental models clearly support the role of ET-1 in the pathogenesis of endothelial dysfunction demonstrating that antagonism of the ET system improves nitric oxide-mediated endothelial function [35,36,37].
In this context, treatment with ET-1 receptor antagonists may offer a novel therapy for hypertensive patients.
Following the conflicting results on BP lowering [28] and potential adverse effects (fluid retention) [38] obtained with other ET-1 receptor antagonists, aprocitentan in patients with resistant hypertension is currently under investigation in the PRECISION phase III trial (ClinicalTrials identifier: NCT03541174).
To date, the potential role of aprocitentan in this clinical setting is supported by some findings from experimental and clinical studies. First, the absolute reductions in BP achieved with aprocitentan [32] are in the ranges established as a surrogate for reduction in cardiovascular morbidity in hypertension [39,40,41,42,43]. Second, significant changes in BP with aprocitentan are obtained within 14 days [32]. Third, BP-lowering effects of aprocitentan have also been documented with ABPM [32] which is more closely related to target organ damage and cardiovascular outcome than office measurements [44,45,46,47]. Finally, aprocitentan enhances the BP-lowering effects of other antihypertensive drugs, including RAS blockers [4].
In conclusion, blocking the actions of ET-1 by aprocitentan could potentially reduce BP and provide broader cardiovascular protection to patients with resistant hypertension. Moreover, this antihypertensive agent could exert additional mechanisms beyond the expected beneficial effects of a sustained BP-lowering action, including a decrease in renal vascular resistance and left ventricular hypertrophy [4]. Taken together, these results support the hypothesis that this new agent could expand our antihypertensive arsenal in resistant hypertension, making aprocitentan an attractive candidate for further large-scale trials.
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Angeli, F., Verdecchia, P. & Reboldi, G. Aprocitentan, A Dual Endothelin Receptor Antagonist Under Development for the Treatment of Resistant Hypertension. Cardiol Ther 10, 397–406 (2021). https://doi.org/10.1007/s40119-021-00233-7
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DOI: https://doi.org/10.1007/s40119-021-00233-7