Vericiguat: A Novel Oral Soluble Guanylate Cyclase Stimulator for the Treatment of Heart Failure

Towards the Fifth Pillar for the Treatment of Heart Failure with Reduced Ejection Fraction: Vericiguat in Older and Complex Patients

Heart failure with reduced ejection fraction (HFrEF) represents an emerging epidemic, particularly affecting frail, older, and multimorbid patients. Current therapy for the management of HFrEF includes four different classes of disease-modifying drugs, commonly referred to as 'four pillars', which target the neurohormonal system that is overactivated in HF and contributes to its progression. These classes of drugs include β-blockers, inhibitors of the renin-angiotensin-aldosterone system, mineralocorticoid receptor antagonists, and sodium-glucose co-transporter-2 (SGLT2) inhibitors. Unfortunately, these agents cannot be administered as frequently as needed to older patients because of poor tolerability and comorbidities. In addition, although these drugs have dramatically increased the survival expectations of patients with HF, their residual risk of rehospitalization and death at 5 years remains considerable. Vericiguat, a soluble guanylate cyclase (sGC) stimulator, was reported to exert beneficial effects in patients with worsening HF, including older subjects, reducing the rate of both hospitalizations and deaths, with limited adverse effects and drug interaction. In this narrative review, we present the current state of art on vericiguat, with a particular focus on elderly and frail patients.

Decoding signaling mechanisms: unraveling the targets of guanylate cyclase agonists in cardiovascular and digestive diseases

Soluble guanylate cyclase agonists and guanylate cyclase C agonists are two popular drugs for diseases of the cardiovascular system and digestive systems. The common denominator in these conditions is the potential therapeutic target of guanylate cyclase. Thanks to in-depth explorations of their underlying signaling mechanisms, the targets of these drugs are becoming clearer. This review explains the recent research progress regarding potential drugs in this class by introducing representative drugs and current findings on them.

Experimental drugs in randomized controlled trials for long-COVID: what's in the pipeline? A systematic and critical review

INTRODUCTION

Over three years have passed since the emergence of coronavirus disease 2019 (COVID-19), and yet the treatment for long-COVID, a post-COVID-19 syndrome, remains long overdue. Currently, there is no standardized treatment available for long-COVID, primarily due to the lack of funding for post-acute infection syndromes (PAIS). Nevertheless, the past few years have seen a renewed interest in long-COVID research, with billions of dollars allocated for this purpose. As a result, multiple randomized controlled trials (RCTs) have been funded in the quest to find an effective treatment for long-COVID.

AREAS COVERED

This systematic review identified and evaluated the potential of current drug treatments for long-COVID, examining both completed and ongoing RCTs.

EXPERT OPINION

We identified four completed and 22 ongoing RCTs, investigating 22 unique drugs. However, most drugs were deemed to not have high potential for treating long-COVID, according to three pre-specified domains, a testament to the ordeal of treating long-COVID. Given that long-COVID is highly multifaceted with several proposed subtypes, treatments likely need to be tailored accordingly. Currently, rintatolimod appears to have modest to high potential for treating the myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) subtype, LTY-100 and Treamid for pulmonary fibrosis subtype, and metformin for general long-COVID prevention.

Identifying the patient with heart failure to be treated with vericiguat

The pathophysiology of heart failure with reduced ejection fraction (HFrEF) is a complex process in which a number of neurohormonal systems are involved. Targeting only some of these systems, but not all, translates into a partial benefit of HF treatment. The nitric oxide-soluble guanylate cyclase (sGC)-cGMP pathway is impaired in HF, leading to cardiac, vascular and renal disturbances. Vericiguat is a once-daily oral stimulator of sGC that restores this system. No other disease-modifying HF drugs act on this system. Despite guidelines recommendations, a substantial proportion of patients are not taking all recommended drugs or when taking them, they do so at low doses, limiting their potential benefits. In this context, treatment should be optimized considering different parameters, such as blood pressure, heart rate, renal function, or potassium, as they may interfere with their implementation at the recommended doses. The VICTORIA trial showed that adding vericiguat to standard therapy in patients with HFrEF significantly reduced the risk of cardiovascular death or HF hospitalization by 10% (NNT 24). Furthermore, vericiguat does not interfere with heart rate, renal function or potassium, making it particularly useful for improving the prognosis of patients with HFrEF in specific settings and clinical profiles.

Vericiguat for the treatment of heart failure with reduced ejection fraction

INTRODUCTION

Despite significant therapeutic advancements in heart failure with reduced ejection fraction (HFrEF), the residual risk of all-cause mortality and hospitalizations remains high among patients with HFrEF. Vericiguat is a novel oral soluble guanylate cyclase (sGC) stimulator which was approved by the US Food and Drug administration (FDA) in January 2021 for use in patients with symptomatic chronic HF and an ejection fraction less than 45% following a hospitalization for HF or the need for outpatient intravenous diuretics.

AREAS COVERED

We provide a concise review of the pharmacology, clinical efficacy, and tolerability of vericiguat in HFrEF. We also discuss the role of vericiguat in current clinical practice.

EXPERT OPINION

Vericiguat reduces the risk of cardiovascular mortality or HF hospitalizations by an absolute event-rate reduction of 4.2 events per 100 patient-years with a number needed to treat of 24 patients, on a background of guideline-directed medical therapy. Almost 90% of the patients with HFrEF were adherent to the 10 mg dose of vericiguat in the VICTORIA trial with a favorable tolerability and safety profile. Considering the high residual risk that persists in HFrEF, vericiguat has a role to improve outcomes among patients with worsening HFrEF.

Efficacy and safety of vericiguat in heart failure: a meta-analysis

OBJECTIVE

This study aimed to investigate the safety and efficacy of vericiguat in patients with heart failure (HF).

METHODS

We conducted a comprehensive literature review of the PubMed, Embase, and Cochrane Library databases up to 14 December 2022 for studies comparing vericiguat with placebo in patients with HF. Clinical data were extracted and cardiovascular deaths, adverse effects, and HF-related hospitalization were analyzed using Review Manager software (version 5.3), after quality assessment of the enrolled studies.

RESULTS

Four studies (6705 patients) were included in this meta-analysis. There were no significant differences in the basic characteristics of the included studies. There was no significant difference in adverse effects between the vericiguat group and placebo group, and no significant differences between the groups in terms of cardiovascular death and HF hospitalization.

CONCLUSION

This meta-analysis indicated that vericiguat was not an effective drug for HF; however, more clinical trials are required to verify its efficacy.

Stimulation of soluble guanylate cyclase by vericiguat reduces skeletal muscle atrophy of mice following chemotherapy

Background: The chemotherapeutic doxorubicin (DOX) promotes severe skeletal muscle atrophy, which induces skeletal muscle weakness and fatigue. Soluble guanylate cyclase (sGC) contributes to a variety of pathophysiological processes, but whether it is involved in DOX-induced skeletal muscle atrophy is unclear. The present study aimed to stimulate sGC by vericiguat, a new oral sGC stimulator, to test its role in this process. Methods: Mice were randomly divided into four groups: control group, vericiguat group, DOX group, and DOX + vericiguat group. Exercise capacity was evaluated before the mice were sacrificed. Skeletal muscle atrophy was assessed by histopathological and molecular biological methods. Protein synthesis and degradation were monitored in mice and C2C12 cells. Results: In this study, a significant decrease in exercise capacity and cross-sectional area (CSA) of skeletal muscle fibers was found in mice following DOX treatment. Furthermore, DOX decreased sGC activity in mice and C2C12 cells, and a positive correlation was found between sGC activity and CSA of skeletal muscle fibers in skeletal muscle. DOX treatment also impaired protein synthesis, shown by puromycin detection, and activated ubiquitin-proteasome pathway. Following sGC stimulation, the CSA of muscle fibers was elevated, and exercise capacity was enhanced. Stimulation of sGC also increased protein synthesis and decreased ubiquitin-proteasome pathway. In terms of the underlying mechanisms, AKT/mTOR and FoxO1 pathways were impaired following DOX treatment, and stimulation of sGC restored the blunted pathways. Conclusion: These results unravel sGC stimulation can improve skeletal muscle atrophy and increase the exercise capacity of mice in response to DOX treatment by enhancing protein synthesis and inhibiting protein degradation. Stimulation of sGC may be a potential treatment of DOX-induced skeletal muscle dysfunction.