The Effect of 4-Methylcatechol on Platelets in Familial Hypercholesterolemic Patients Treated with Lipid Apheresis and/or Proprotein Convertase Subtilisin Kexin 9 Monoclonal Antibodies.

Elevated low-density lipoprotein (LDL) cholesterol levels lead to atherosclerosis and platelet hyperaggregability, both of which are known culprits of arterial thrombosis. Normalization of LDL cholesterol in familial hypercholesterolemia (FH) is not an easy task and frequently requires specific treatment, such as regularly performed lipid apheresis and/or novel drugs such as proprotein convertase subtilisin kexin 9 monoclonal antibodies (PCSK9Ab). Moreover, a high resistance rate to the first-line antiplatelet drug acetylsalicylic acid (ASA) stimulated research of novel antiplatelet drugs. 4-methylcatechol (4-MC), a known metabolite of several dietary flavonoids, may be a suitable candidate. The aim of this study was to analyse the antiplatelet effect of 4-MC in FH patients and to compare its impact on two FH treatment modalities via whole-blood impedance aggregometry. When compared to age-matched, generally healthy controls, the antiplatelet effect of 4-MC against collagen-induced aggregation was higher in FH patients. Apheresis itself improved the effect of 4-MC on platelet aggregation and blood from patients treated with this procedure and pretreated with 4-MC had lower platelet aggregability when compared to those solely treated with PCKS9Ab. Although this study had some inherent limitations, e.g., a low number of patients and possible impact of administered drugs, it confirmed the suitability of 4-MC as a promising antiplatelet agent and also demonstrated the effect of 4-MC in patients with a genetic metabolic disease for the first time.

Adjunctive therapy with lipid-lowering agents in COVID-19: a systematic review and meta-analysis of randomized controlled trials.

BACKGROUND: Many commonly used drugs were evaluated as repurposed treatment options since the emergence of the COVID-19 pandemic. The benefit of lipid-lowering agents has been controversial in this regard. In this systematic review, we assessed the effect of these medications as adjunctive therapy in COVID-19 by the inclusion of randomized controlled trials (RCTs). METHODS: We searched four international databases including PubMed, the Web of Science, Scopus, and Embase for RCTs in April 2023. The primary outcome was mortality, while other efficacy indices were considered secondary outcomes. In order to estimate the pooled effect size of the outcomes, considering the odds ratio (OR) or standardized mean difference (SMD) and 95% confidence interval (CI), random-effect meta-analyses was conducted. RESULTS: Ten studies involving 2,167 COVID-19 patients using statins, omega-3 fatty acids, fenofibrate, PCSK9 inhibitors, and nicotinamide as intervention compared to control or placebo, were included. No significant difference was found in terms of mortality (OR 0.96, 95% CI 0.58 to 1.59, p-value = 0.86, I2 = 20.4%) or length of hospital stay (SMD -0.10, 95% CI -0.78 to 0.59, p-value = 0.78, I2 = 92.4%) by adding a statin to the standard of care. The trend was similar for fenofibrate and nicotinamide. PCSK9 inhibition, however, led to decreased mortality and an overall better prognosis. Omega-3 supplementation showed contradicting results in two trials, suggesting the need for further evaluation. CONCLUSION: Although some observational studies found improved outcomes in patients using lipid-lowering agents, our study found no benefit in adding statins, fenofibrate, or nicotinamide to COVID-19 treatment. On the other hand, PCSK9 inhibitors can be a good candidate for further assessment. Finally, there are major limitations in the use of omega-3 supplements in treating COVID-19 and more trials are warranted to evaluate this efficacy.

Coronary microcirculatory dysfunction in hypercholesterolemic patients with COVID-19: potential benefit from cholesterol-lowering treatment.

Patients with hypercholesterolemia often have coronary microvascular dysfunction (CMD). Viral infections, such as the SARS-CoV-2 infection, may also result in CMD. Three non-randomized studies have shown significant beneficial effects of statins on CMD in non-infected patients. Similarly, in SARS-CoV-2 - infected patients one beneficial mechanism of action of statins may be the amelioration of endothelial dysfunction, which is a major driver of CMD. Apart from statins, lipoprotein apheresis and PCSK9 inhibitors can also improve or even reverse CMD. The potential reversal of CMD by using effective cholesterol-lowering medications during and after COVID-19 infection, especially in hypercholesterolemic COVID-19 patients, is important.KEY MESSAGESCoronary microvascular dysfunction (CMD) is common in patients hospitalized with SARS-CoV-2 infectionThree nonrandomized studies in non-infected patients are showing the beneficial effects of statin treatment on CMDEffective cholesterol-lowering medication during and after SARS-CoV-2 infection, especially in hypercholesterolemic COVID-19 patients, is of great significance.

The Multifaceted Biology of PCSK9.

This article reviews the discovery of PCSK9, its structure-function characteristics, and its presently known and proposed novel biological functions. The major critical function of PCSK9 deduced from human and mouse studies, as well as cellular and structural analyses, is its role in increasing the levels of circulating low-density lipoprotein (LDL)-cholesterol (LDLc), via its ability to enhance the sorting and escort of the cell surface LDL receptor (LDLR) to lysosomes. This implicates the binding of the catalytic domain of PCSK9 to the EGF-A domain of the LDLR. This also requires the presence of the C-terminal Cys/His-rich domain, its binding to the secreted cytosolic cyclase associated protein 1, and possibly another membrane-bound "protein X". Curiously, in PCSK9-deficient mice, an alternative to the downregulation of the surface levels of the LDLR by PCSK9 is taking place in the liver of female mice in a 17ß-estradiol-dependent manner by still an unknown mechanism. Recent studies have extended our understanding of the biological functions of PCSK9, namely its implication in septic shock, vascular inflammation, viral infections (Dengue; SARS-CoV-2) or immune checkpoint modulation in cancer via the regulation of the cell surface levels of the T-cell receptor and MHC-I, which govern the antitumoral activity of CD8+ T cells. Because PCSK9 inhibition may be advantageous in these processes, the availability of injectable safe PCSK9 inhibitors that reduces by 50% to 60% LDLc above the effect of statins is highly valuable. Indeed, injectable PCSK9 monoclonal antibody or small interfering RNA could be added to current immunotherapies in cancer/metastasis.

The Role of PCSK9 in Infectious Diseases.

BACKGROUND: In recent years, many aspects of the physiological role of PCSK9 have been elucidated, in particular regarding its role in lipid metabolism, cardiovascular risk but also its role in innate immunity. Increasing evidence is available on the involvement of PCSK9 in the pathogenesis of viral infections, mainly HCV, as well as in the regulation of host response to bacterial infections, mainly sepsis and septic shock. Moreover, the action of PCSK9 has been investigated as a crucial step in the pathogenesis of malaria infection and disease severity. OBJECTIVE: Aim of this paper is to review available published literature on the role of PCSK9 in a wide array of infectious diseases. CONCLUSION: Besides the ongoing investigation on PCSK9 inhibition among HIV-infected patients for the treatment of HIV- and ART-related hyperlipidemia, preclinical studies indicate how PCSK9 is involved in reducing the replication of HCV. Moreover, a protective role of PCSK9 inhibition has also been proposed against dengue and SARS-CoV-2 viral infections. Interestingly, high plasmatic PCSK9 levels have been described in patients with sepsis. Finally, a loss of function in the PCSK9-encoding gene has been reported to possibly reduce mortality in malaria infection.

PCSK9 Inhibition During the Inflammatory Stage of SARS-CoV-2 Infection.

BACKGROUND: The intensity of inflammation during COVID-19 is related to adverse outcomes. Proprotein convertase subtilisin/kexin type 9 (PCSK9) is involved in low-density lipoprotein receptor homeostasis, with potential influence on vascular inflammation and on COVID-19 inflammatory response. OBJECTIVES: The goal of this study was to investigate the impact of PCSK9 inhibition vs placebo on clinical and laboratory outcomes in patients with severe COVID-19. METHODS: In this double-blind, placebo-controlled, multicenter pilot trial, 60 patients hospitalized for severe COVID-19, with ground-glass opacity pneumonia and arterial partial oxygen pressure to fraction of inspired oxygen ratio ≤300 mm Hg, were randomized 1:1 to receive a single 140-mg subcutaneous injection of evolocumab or placebo. The primary endpoint was death or need for intubation at 30 days. The main secondary endpoint was change in circulating interleukin (IL)-6 at 7 and 30 days from baseline. RESULTS: Patients randomized to receive the PCSK9 inhibitor had lower rates of death or need for intubation within 30 days vs placebo (23.3% vs 53.3%, risk difference: -30%; 95% CI: -53.40% to -6.59%). Serum IL-6 across time was lower with the PCSK9 inhibitor than with placebo (30-day decline: -56% vs -21%). Patients with baseline IL-6 above the median had lower mortality with PCSK9 inhibition vs placebo (risk difference: -37.50%; 95% CI: -68.20% to -6.70%). CONCLUSIONS: PCSK9 inhibition compared with placebo reduced the primary endpoint of death or need for intubation and IL-6 levels in severe COVID-19. Patients with more intense inflammation at randomization had better survival with PCSK9 inhibition vs placebo, indicating that inflammatory intensity may drive therapeutic benefits. (Impact of PCSK9 Inhibition on Clinical Outcome in Patients During the Inflammatory Stage of the COVID-19 [IMPACT-SIRIO 5]; NCT04941105).

SKI-1/S1P Facilitates SARS-CoV-2 Spike Induced Cell-to-Cell Fusion via Activation of SREBP-2 and Metalloproteases, Whereas PCSK9 Enhances the Degradation of ACE2.

Proprotein convertases activate various envelope glycoproteins and participate in cellular entry of many viruses. We recently showed that the convertase furin is critical for the infectivity of SARS-CoV-2, which requires cleavage of its spike protein (S) at two sites: S1/S2 and S2'. This study investigates the implication of the two cholesterol-regulating convertases SKI-1 and PCSK9 in SARS-CoV-2 entry. The assays used were cell-to-cell fusion in HeLa cells and pseudoparticle entry into Calu-3 cells. SKI-1 increased cell-to-cell fusion by enhancing the activation of SREBP-2, whereas PCSK9 reduced cell-to-cell fusion by promoting the cellular degradation of ACE2. SKI-1 activity led to enhanced S2' formation, which was attributed to increased metalloprotease activity as a response to enhanced cholesterol levels via activated SREBP-2. However, high metalloprotease activity resulted in the shedding of S2' into a new C-terminal fragment (S2″), leading to reduced cell-to-cell fusion. Indeed, S-mutants that increase S2″ formation abolished S2' and cell-to-cell fusion, as well as pseudoparticle entry, indicating that the formation of S2″ prevents SARS-CoV-2 cell-to-cell fusion and entry. We next demonstrated that PCSK9 enhanced the cellular degradation of ACE2, thereby reducing cell-to-cell fusion. However, different from the LDLR, a canonical target of PCSK9, the C-terminal CHRD domain of PCSK9 is dispensable for the PCSK9-induced degradation of ACE2. Molecular modeling suggested the binding of ACE2 to the Pro/Catalytic domains of mature PCSK9. Thus, both cholesterol-regulating convertases SKI-1 and PCSK9 can modulate SARS-CoV-2 entry via two independent mechanisms.

Proprotein convertases regulate trafficking and maturation of key proteins within the secretory pathway.

Proprotein Convertases (PCs) are serine endoproteases that regulate the homeostasis of protein substrates in the cell. The PCs family counts 9 members-PC1/3, PC2, PC4, PACE4, PC5/6, PC7, Furin, SKI-1/S1P, and PCSK9. The first seven PCs are known as Basic Proprotein Convertases due to their propensity to cleave after polybasic clusters. SKI-1/S1P requires the additional presence of hydrophobic residues for processing, whereas PCSK9 is catalytically dead after autoactivation and exerts its functions using mechanisms alternative to direct cleavage. All PCs traffic through the canonical secretory pathway, reaching different compartments where the various substrates reside. Despite PCs members do not share the same subcellular localization, most of the cellular organelles count one or more Proprotein Convertases, including ER, Golgi stack, endosomes, secretory granules, and plasma membranes. The widespread expression of these enzymes at the systemic level speaks for their importance in the homeostasis of a large number of biological functions. Among others, PCs cleave precursors of hormones and growth factors and activate receptors and transcription factors. Notably, dysregulation of the enzymatic activity of Proprotein Convertases is associated to major human pathologies, such as cardiovascular diseases, cancer, diabetes, infections, inflammation, autoimmunity diseases, and Parkinson. In the current COVID-19 pandemic, Furin has further attracted the attention as a key player for conferring high pathogenicity to SARS-CoV-2. Here, we review the Proprotein Convertases family and their most important substrates along the secretory pathway. Knowledge about the complex functions of PCs is important to identify potential drug strategies targeting this class of enzymes.

[The OIBOH Registry (Optimal Intensification therapy in a Broad Observed High risk patient population with coronary disease): an Italian observational study of secondary prevention after a coronary event during the pandemic COVID-19 outbreak]. / Il registro OIBOH (Optimal Intensification therapy in a Broad Observed High risk patient population with coronary disease): studio italiano osservazionale di prevenzione secondaria dopo evento coronarico durante la pandemia COVID-19.

Razionale. In Italia la pandemia COVID-19 ha determinato importanti riorganizzazioni logistiche nell'erogazione delle cure ospedaliere e di specialistica ambulatoriale. Ciò ha spinto clinici e decisori pubblico-amministrativi della Sanità ad adottare nuovi modelli organizzativi in molteplici scenari clinici. Materiali e metodi. Il registro OIBOH (Optimal Intensification therapy in a Broad Observed High risk patient population with coronary disease) è uno studio osservazionale "cross-sectional" condotto in vari centri italiani di cardiologia ambulatoriale per valutare durante la pandemia COVID-19 la capacità di identificare in breve tempo i pazienti ad altissimo rischio cardiovascolare residuo dopo un evento coronarico recente (<12 mesi). Successivamente alla valutazione clinica iniziale, venivano arruolati i pazienti ritenuti ad altissimo rischio, registrando le caratteristiche cliniche e di trattamento in una scheda di raccolta dati elettronica.Risultati. Al registro hanno partecipato 134 centri di cardiologia ambulatoriale che hanno arruolato 1428 pazienti su 3227 esaminati fra quelli che avevano avuto accesso ad una visita cardiologica durante la pandemia nel periodo ottobre 2020-marzo 2021. Il criterio di arruolamento era costituito dall'aver avuto una diagnosi di coronaropatia confermata angiograficamente negli ultimi 12 mesi, per sindrome coronarica acuta (SCA) o cronica (SCC). La SCA come evento indice era presente nel 93% dei pazienti arruolati mentre la SCC nel 7%. L'età media era 67 ± 10 anni, il 25% era di sesso femminile. Il 96.1% dei pazienti con SCA e il 67.6% dei pazienti con SCC sono stati sottoposti a rivascolarizzazione coronarica. Il 46% e 47% dei pazienti con SCA e SCC, rispettivamente, era diabetico. Oltre il 65% dei pazienti presentava una malattia coronarica multivasale. È stata osservata una importante prevalenza di arteriopatia periferica (17.5% nei pazienti con SCA e 19.6% nei pazienti con SCC). I valori di pressione arteriosa e frequenza cardiaca risultavano ben controllati (128 ± 25.2 mmHg e 65 ± 12.3 b/min nei pazienti con SCA; 127 ± 23.4 mmHg e 67 ± 13.2 b/min nei pazienti con SCC). Viceversa, è stato riportato uno scarso controllo dei livelli di colesterolemia LDL, con un valore medio di 88.8 ± 38.6 mg/dl nei pazienti con SCA e 86 ± 36.6 mg/dl nei pazienti con SCC. Solo il 16.4% dei pazienti con SCA raggiungeva i livelli raccomandati dalle attuali linee guida europee. Nonostante l'estensivo uso di statine (>90%), si è rilevato un utilizzo limitato dell'associazione statina ad alta intensità + ezetimibe (solo il 22.4% dei pazienti). Estremamente basso è stato l'utilizzo di inibitori di PCSK9 (2.5%). La duplice terapia antiaggregante piastrinica (DAPT) è risultata complessivamente ben condotta fin dalla dimissione ospedaliera. Nei pazienti in DAPT, l'inibitore P2Y12 più utilizzato è risultato il ticagrelor alla dose di 90 mg, soprattutto dopo un evento coronarico acuto (in circa l'80% dei pazienti con SCA). Nella stragrande maggioranza dei casi (>90%) i cardiologi ambulatoriali hanno posto indicazione a prosecuzione della DAPT oltre i 12 mesi con aspirina e ticagrelor 60 mg bid. Conclusioni. La gestione del paziente con coronaropatia in fase cronica stabilizzata è molto complessa. Tale complessità logistico-gestionale si è accentuata durante la pandemia COVID-19. Il registro OIBOH ha evidenziato un'ottima capacità di identificare le problematiche clinico-prognostiche delle cardiologie ambulatoriali italiane, specie nei pazienti ad altissimo rischio residuo. Rimangono importanti aree di miglioramento come uno stretto controllo della colesterolemia LDL, mentre altre raccomandazioni delle linee guida, come la prosecuzione della DAPT con ticagrelor 60 mg oltre i 12 mesi, risultano ben applicate. L'implementazione dell'assistenza con la medicina digitale e l'intelligenza artificiale potrebbe migliorare di molto la performance dei clinici.

TIMES TO ACT. Italian-Spanish-Polish-Uzbek Expert Forum Position Paper 2022. Dyslipidemia and arterial hypertension: The two most important and modifiable risk factors in clinical practice.

Hypertension and lipid disorders are two of the main cardiovascular risk factors. Both risk factors - if detected early enough - can be controlled and treated with modern, effective drugs, devoid of significant side effects, available in four countries as different as Italy, Spain, Poland, and Uzbekistan. The aim herein, was to develop this TIMES TO ACT consensus to raise the awareness of the available options of the modern and intensified dyslipidemia and arterial hypertension treatments. The subsequent paragraphs involves consensus and discussion of the deleterious effects of COVID-19 in the cardiovascular field, the high prevalence of hypertension and lipid disorders in our countries and the most important reasons for poor control of these two factors. Subsequently proposed, are currently the most efficient and safe therapeutic options in treating dyslipidemia and arterial hypertension, focusing on the benefits of single-pill combination (SPCs) in both conditions. An accelerated algorithm is proposed to start the treatment with a PCSK9 inhibitor, if the target low-density-lipoprotein values have not been reached. As most patients with hypertension and lipid disorders present with multiple comorbidities, discussed are the possibilities of using new SPCs, combining modern drugs from different therapeutic groups, which mode of action does not confirm the "class effect". We believe our consensus strongly advocates the need to search for patients with cardiovascular risk factors and intensify their lipid-lowering and antihypertensive treatment based on SPCs will improve the control of these two basic cardiovascular risk factors in Italy, Spain, Poland and Uzbekistan.

Transcript-Targeted Therapy Based on RNA Interference and Antisense Oligonucleotides: Current Applications and Novel Molecular Targets.

The development of novel target therapies based on the use of RNA interference (RNAi) and antisense oligonucleotides (ASOs) is growing in an exponential way, challenging the chance for the treatment of the genetic diseases and cancer by hitting selectively targeted RNA in a sequence-dependent manner. Multiple opportunities are taking shape, able to remove defective protein by silencing RNA (e.g., Inclisiran targets mRNA of protein PCSK9, permitting a longer half-life of LDL receptors in heterozygous familial hypercholesteremia), by arresting mRNA translation (i.e., Fomivirsen that binds to UL123-RNA and blocks the translation into IE2 protein in CMV-retinitis), or by reactivating modified functional protein (e.g., Eteplirsen able to restore a functional shorter dystrophin by skipping the exon 51 in Duchenne muscular dystrophy) or a not very functional protein. In this last case, the use of ASOs permits modifying the expression of specific proteins by modulating splicing of specific pre-RNAs (e.g., Nusinersen acts on the splicing of exon 7 in SMN2 mRNA normally not expressed; it is used for spinal muscular atrophy) or by downregulation of transcript levels (e.g., Inotersen acts on the transthryretin mRNA to reduce its expression; it is prescribed for the treatment of hereditary transthyretin amyloidosis) in order to restore the biochemical/physiological condition and ameliorate quality of life. In the era of precision medicine, recently, an experimental splice-modulating antisense oligonucleotide, Milasen, was designed and used to treat an 8-year-old girl affected by a rare, fatal, progressive form of neurodegenerative disease leading to death during adolescence. In this review, we summarize the main transcriptional therapeutic drugs approved to date for the treatment of genetic diseases by principal regulatory government agencies and recent clinical trials aimed at the treatment of cancer. Their mechanism of action, chemical structure, administration, and biomedical performance are predominantly discussed.

Advances in Clinical Cardiology 2021: A Summary of Key Clinical Trials.

INTRODUCTION: Over the course of 2021, numerous key clinical trials with valuable contributions to clinical cardiology were published or presented at major international conferences. This review seeks to summarise these trials and reflect on their clinical context. METHODS: The authors reviewed clinical trials presented at major cardiology conferences during 2021 including the American College of Cardiology (ACC), European Association for Percutaneous Cardiovascular Interventions (EuroPCR), European Society of Cardiology (ESC), Transcatheter Cardiovascular Therapeutics (TCT), American Heart Association (AHA), European Heart Rhythm Association (EHRA), Society for Cardiovascular Angiography and Interventions (SCAI), TVT-The Heart Summit (TVT) and Cardiovascular Research Technologies (CRT). Trials with a broad relevance to the cardiology community and those with potential to change current practice were included. RESULTS: A total of 150 key cardiology clinical trials were identified for inclusion. Interventional cardiology data included trials evaluating the use of new generation novel stent technology and new intravascular physiology strategies such as quantitative flow ratio (QFR) to guide revascularisation in stable and unstable coronary artery disease. New trials in acute coronary syndromes focused on shock, out of hospital cardiac arrest (OOHCA), the impact of COVID-19 on ST-elevation myocardial infarction (STEMI) networks and optimal duration/type of antiplatelet treatment. Structural intervention trials included latest data on transcatheter aortic valve replacement (TAVR) and mitral, tricuspid and pulmonary valve interventions. Heart failure data included trials with sodium-glucose cotransporter 2 (SGLT2) inhibitors, sacubitril/valsartan and novel drugs such as mavacamten for hypertrophic cardiomyopathy (HCM). Prevention trials included new data on proprotein convertase subtilisin/kexin type 9 (PCSK9) inhibitors. In electrophysiology, new data regarding atrial fibrillation (AF) screening and new evidence for rhythm vs. rate control strategies were evaluated. CONCLUSION: This article presents a summary of key clinical cardiology trials published and presented during the past year and should be of interest to both practising clinicians and researchers.

Impact of the COVID-19 pandemic in the lipid control of the patients that start PCSK9 inhibitors. / Impacto de la pandemia por COVID-19 en el control lipídico de pacientes que inician inhibidores de la PCSK9.

OBJECTIVES: MEMOGAL study (NCT04319081) is aimed at evaluating changes in cognitive function in patients treated with PCSK9 inhibitors (PCSK9i). This is the first analysis: (1) discussion about the role of the Hospital Pharmacists during the pandemic, and also the assessment of the impact of COVID-19 in the lipid control; (2) descriptive analysis; (3) effectiveness in LDL cholesterol (LDL-c) reduction of alirocumab and evolocumab; (4) communicate PCSK9i safety. MATERIAL AND METHODS: It is a prospective Real-World Evidence analysis of patients that take PCSK9i for the first time in the usual clinical practice, and they are included after the first dispensation in the public pharmacy consultations of 12 Hospitals in Galicia from May 2020 to April 2021. Baseline values of LDL-c are the previous values before taking PCSK9 and the follow-up values are in 6 months time. RESULTS: 89 patients were included. 86.5% with cardiovascular disease and 53.9% with statin intolerances. 78.8% of the patients were treated with high intensity statins. Statins most used were rosuvastatin (34.1%) and atorvastatin (20.5%). Baseline value of LDL-c was 148mg/dL and the follow-up value was 71mg/dL. The baseline value of patients treated with alirocumab (N=43) was 144mg/dL and 73mg/dL in the follow-up. With evolocumab (N=46) was 151mg/dL in basaline and 69mg/dL in follow-up. The LDLc- reduction was 51.21% with evolocumab and 51.05% with alirocumab. 43.1% of the patients showed values >70mg/dL in six month time; 19.4% between 69mg/dl and 55mg/dL and 37.5% <55mg/dL. 58.3% of the patients achieved a reduction >50% of LDL-c. The adverse events were: injection point reaction (N=2), myalgias (N=1), flu-like symptoms (N=1) and neurocognitive worsening (N=1). CONCLUSIONS: (1) Despite the number of prescriptions was reduced because of the pandemic, the lipid control was not affected. (2) Half of the patients treated with PSCK9i is due to statins intolerance and the 86% is for secondary prevention. (2) The reduction results were similar to pivotal clinical trials. Despite this, 39% of the total of the patients and 60% of patients with dual teraphy did not reach the goal of ESC/EAS guidelines (<55mg/dL and/or reduction>50%). There were not significant differences between evolocumab and alirocumab: 51.21% vs 51.05% (P=.972). (3) There were not any adverse events of special interest. The possible neurocognitive worsening will be studied as the primary endpoint once the MEMOGAL study has been completed.

Highlights of Cardiovascular Disease Studies Presented at the 2021 American Heart Association Scientific Sessions.

PURPOSE OF REVIEW: This review highlights major studies across a broad array of topics presented at the virtual 2021 American Heart Association (AHA) Scientific Sessions. RECENT FINDINGS: Assessed studies examine a remotely delivered hypertension and lipid program in 10,000 patients across a diverse healthcare network; a cluster-randomized trial of a village doctor-led intervention for hypertension control; empagliflozin in heart failure with preserved ejection fraction (EMPEROR-Preserved); efficacy and safety of empagliflozin in hospitalized heart failure patients (EMPULSE); icosapent ethyl versus placebo in outpatients with coronavirus disease 2019 (PREPARE-IT 2); clinical safety, pharmacokinetics, and low-density lipoprotein cholesterol-lowering efficacy of MK-0161, an oral proprotein convertase subtilisin/kexin type 9 (PCSK9) inhibitor; and effects of aspirin on dementia and cognitive impairment in the ASCEND trial. Research presented at the 2021 AHA Scientific Sessions emphasized the importance of interventions for cardiovascular disease prevention.

Association of lipid-lowering drugs with COVID-19 outcomes from a Mendelian randomization study.

Background: Lipid metabolism plays an important role in viral infections. We aimed to assess the causal effect of lipid-lowering drugs (HMGCR inhibitiors, PCSK9 inhibitiors, and NPC1L1 inhibitior) on COVID-19 outcomes using two-sample Mendelian randomization (MR) study. Methods: We used two kinds of genetic instruments to proxy the exposure of lipid-lowering drugs, including expression quantitative trait loci of drugs target genes, and genetic variants within or nearby drugs target genes associated with low-density lipoprotein (LDL cholesterol from genome-wide association study). Summary-data-based MR (SMR) and inverse-variance-weighted MR (IVW-MR) were used to calculate the effect estimates. Results: SMR analysis found that a higher expression of HMGCR was associated with a higher risk of COVID-19 hospitalization (odds ratio [OR] = 1.38, 95% confidence interval [CI] = 1.06-1.81). Similarly, IVW-MR analysis observed a positive association between HMGCR-mediated LDL cholesterol and COVID-19 hospitalization (OR = 1.32, 95% CI = 1.00-1.74). No consistent evidence from both analyses was found for other associations. Conclusions: This two-sample MR study suggested a potential causal relationship between HMGCR inhibition and the reduced risk of COVID-19 hospitalization. Funding: Start-up Fund for high-level talents of Fujian Medical University.

The virus SARS-CoV-2 has caused millions of infections and deaths during the COVID-19 pandemic, but as of December 2021, no new drugs targeted to SARS-CoV-2 specifically exist. Thus, it is important to identify existing drugs that can reduce the infection and mortality of this virus, since repurposing old drugs is faster and cheaper than developing new ones. Fats, such as cholesterol, can play an important role in viral infections, meaning that drugs intended to lower the levels of fats in the blood could have a protective effect against SARS-CoV-2. To test this hypothesis, Huang, Xiao, et al. carried out a Mendelian randomization study to investigate if there is a link between drugs that lower fats and outcomes of SARS-CoV-2 infection, including susceptibility, hospitalization, and severe disease. This approach consists on grouping people according to their version of a particular gene, which minimizes the effect of variables that can cause spurious associations, something known as confounding bias. Thus, Mendelian randomization studies allow scientists to disentangle cause and effect. Using this method, Huang, Xiao, et al. found an association between statins (a type of drug that decreases the levels of bad cholesterol) and a reduced risk of being hospitalized after being infected with SARS-CoV-2. These findings suggest that statins could benefit patients infected with SARS-CoV-2, and indicate that they should be prioritized in future clinical trials for treating COVID-19.

How Do Enveloped Viruses Exploit the Secretory Proprotein Convertases to Regulate Infectivity and Spread?

Inhibition of the binding of enveloped viruses surface glycoproteins to host cell receptor(s) is a major target of vaccines and constitutes an efficient strategy to block viral entry and infection of various host cells and tissues. Cellular entry usually requires the fusion of the viral envelope with host plasma membranes. Such entry mechanism is often preceded by "priming" and/or "activation" steps requiring limited proteolysis of the viral surface glycoprotein to expose a fusogenic domain for efficient membrane juxtapositions. The 9-membered family of Proprotein Convertases related to Subtilisin/Kexin (PCSK) serine proteases (PC1, PC2, Furin, PC4, PC5, PACE4, PC7, SKI-1/S1P, and PCSK9) participate in post-translational cleavages and/or regulation of multiple secretory proteins. The type-I membrane-bound Furin and SKI-1/S1P are the major convertases responsible for the processing of surface glycoproteins of enveloped viruses. Stefan Kunz has considerably contributed to define the role of SKI-1/S1P in the activation of arenaviruses causing hemorrhagic fever. Furin was recently implicated in the activation of the spike S-protein of SARS-CoV-2 and Furin-inhibitors are being tested as antivirals in COVID-19. Other members of the PCSK-family are also implicated in some viral infections, such as PCSK9 in Dengue. Herein, we summarize the various functions of the PCSKs and present arguments whereby their inhibition could represent a powerful arsenal to limit viral infections causing the present and future pandemics.