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Our results suggest that sildenafil might not inhibit PKC or signaling pathways coupled to HDAC regulation in both ventricles at this early stage of the LV disease.

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reported that LV expression levels of pyruvate dehydrogenase-4 (PDK4) and B-MHC dynamically change during RV hypertrophy development induced by chronic hypoxia [38]. observed up-regulation of endothelin-1 mRNA in the LV with impaired LV function also in a rat PAH model induced by monocrotaline [39]. However, it is likely that these LV abnormalities might be directly caused by hypoxia or monocrotaline [40,41]. The present data is the first demonstration that RV-LV interventricular interaction occurs in the absence of direct hemodynamic impacts on the RV, and that this might be mediated by inflammatory process. We observed that sildenafil inhibited BNP but not B-MHC expression in both ventricles, though both BNP and B-MHC are hallmark fetal genes that are reactivated in pathological hypertrophy and heart failure.

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This suggests that their activation mechanisms are under different regulations, consistent with the observation by Kong et al.[42]. De-activation of ERK in both ventricles by sildenafil, in particular, might contribute to the former, given that ERK signaling activation has been well-demonstrated to induce BNP expression by acting on the BNP promoter directly or indirectly through increased GATA4 binding activity [43]. B-MHC up-regulation might occur despite deactivation of both ERK and calcineurin given that neither GATA4 (downstream of ERK) nor blue sildenafil NFAT3 (downstream of calcineurin) is involved in direct B-MHC gene regulation [44]. B-MHC gene expression is induced by complex effects of transcription factors, including SRF and MEF2 under control of HDACs (histone deacetylases), and PKC-activated TEF1 [44]. In addition, MHC isoform switch is also coordinated by microRNA 208, encoded within an intron of A-MHC gene [44,45]. In conclusion, we provide the evidence that RV pathological molecular abnormalities associated with LV disease are initiated early even when the LV disease is still at the early stages, and demonstrate that the PDE5 inhibitor sildenafil has potent effects of ameliorating such molecular abnormalities in both ventricles potentially through the anti-inflammatory effects.

The study provides a novel insight into our understanding of the RV pathophysiology associated with LV diseases. Right ventricular function and failure: Report of a National Heart, Lung, and Blood Institute working group on cellular and molecular mechanisms of right heart failure.

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Quantification results of phosphor/total ratio (p/t ratio) normalized to sham controls are shown in the bar graphs on the right. TAC induced robust phosphorylation of ERK1/2 in RV as well as LV myocardium, and sildenafil prevented this activation in the RV. RCAN1 mRNA expression was increased by TAC in both ventricles, and suppressed by sildenafil. As inflammation marker genes were up-regulated in both ventricles at this early stage, and were prevented by sildenafil, we further performed an immunohistochemical study and assessed macrophage infiltration in the RV and the LV. We found that F4/80 positive cells were significantly increased in both ventricles of 2day-TAC hearts and that sildenafil significantly inhibited the increase in both ventricles (Fig 5).

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(A-C) Myocardium stained for F4/80+ cells in the RV and the LV of the Sham mouse (A), the TAC-2d-Veh mouse (B), and the TAC-2d-Sil mouse (C). (D) The number of F4/80+ cells per high-power field. Transverse aortic constriction for two days induced F4/80+ macrophage infiltration into myocardium not only in the LV but also in the RV, which was suppressed by sildenafil. Studies have documented anti-inflammatory properties of sildenafil [12,22–24], which might be potentially linked to Gq-signal de-activation. We next tested if inflammation might underlie the activation of pathological molecular signaling pathways in the RV during LV pressure-overload. Right ventricular function in cardiovascular disease, part II: Pathophysiology, clinical importance, and management of right ventricular failure.

Effects of right ventricular ejection fraction on outcomes in chronic systolic heart failure.

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Importantly, dexamethasone, a corticosteroid, virtually normalized early molecular derangement in both ventricles, supporting the key role for inflammation that could involve cardiac myocytes, vasculature, and adipose tissue. Long-term effects of dexamethasone, however, could be different from those of sildenafil [33], considering the former inhibits both protective or detrimental aspects of inflammation. The anti-inflammatory effects might be coupled to the Gq regulatory action by cGMP-PKG, given that Gq activation is closely linked to inflammation. For example, lack of Gq-inhibitory protein RGS3 in mice reveals exacerbated inflammation in a mouse model of asthma [34]. Also, in a mouse model of chronic kidney disease, RGS2 deficiency results in enhanced fibrogenic and inflammatory response [35].

Quantitative real-time polymerase chain reaction (PCR)

The precise molecular mechanisms linking Gq signal activation to inflammation and their regulation by cGMP-PKG, however, warrants further investigation. Signaling pathways for cardiac hypertrophy and failure have been intensively investigated and clarified in LV myocardium or LV cardiac myocytes [17,18]; however, there is limited data available with regard to whether and how similar molecular pathways are at work to contribute to RV pathophysiology [36]. Thus far, most studies have utilized rodent models of pulmonary artery hypertension (PAH) or pulmonary artery banding in order to answer this question and have demonstrated several aspects of distinct RV remodeling in response to afterload stress [37]; however, little has been determined about the RV remodeling process that occur due to LV diseases. Using a short-term LV pressure-overload (TAC) model which presents early stage compensated LV hypertrophy without compromised RV hemodynamics, we found that pathological molecular signaling pathways were activated in the RV free wall myocardium, which might be mediated by inflammation. Interventricular interaction has been reported, but in the opposite pathological settings [38,39]. Right heart dysfunction in heart failure with preserved ejection fraction.

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Similar to sildenafil treatment, dexamethasone treatment (20mg/kg/day, intraperitoneally) in two day-TAC hearts inhibited the induction of inflammatory maker genes in the RV as well as in the LV (Fig 6A) and also prevented calcineurin activation and BNP up-regulation(Fig 6B). These results support the potential role for inflammation in this process. (A) mRNA expression of IL1b and IL6, normalized to GAPDH. Dexamethasone inhibited overexpression of IL1b in both RV and LV myocardium induced by transverse aortic constriction (TAC) for 2 days. (B) mRNA expression of RCAN1 and BNP normalized to GAPDH.

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Dexamethasone suppressed up-regulation of RCAN1 and BNP in RV and LV myocardium induced by two-day TAC. TAC 2d Veh, TAC for 50 mg sildenafil price 2 days with vehicle treatment; TAC 2d DXM, TAC for 2 days with dexamethasone treatment. Recent meta-analyses revealed that PDE5 inhibitors improve pulmonary hemodynamics and clinical outcomes in systolic heart failure patients with pulmonary hypertension [25,26]. The present study demonstrates that RV molecular alterations occur very early during LV pressure-overload before RV systolic pressure increases and that these molecular derangement in the RV are inhibited by sildenafil through mechanisms potentially involving anti-inflammation. It is therefore tempting to speculate that earlier intervention with PDE5 inhibitors might confer additional clinical benefits in this pathology. Right ventricular function in heart failure with preserved ejection fraction: A community-based study.

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cGMP-PKG (cGMP-dependent protein kinase) activation by PDE5 inhibition not only induces pulmonary vasodilation but also has direct beneficial impacts on the heart through multiple mechanisms. We and others have demonstrated that cGMP-activated PKG binds to Regulators of G protein Signaling (RGS) 2 and 4 to their activation, deactivating Gq-related signaling in LV myocardium [8]. have demonstrated that PDE5 inhibition with Tadalafil improves mitochondrial energy metabolism and LV cardiac function [11]. More recently, anti-inflammatory properties of sildenafil were reported. Sildenafil treatment is associated with reduced circulating cytokines in patients with diabetes [12] or erectile dysfunction [22].

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Sildenafil reduces cardiac and renal inflammation in a mouse model of type I diabetes [23], and in a mouse model of neuro-inflammation [24]. Our data demonstrate such anti-inflammatory properties of sildenafil as potential key contributor to ameliorating early pathological molecular derangement in the RV during LV pressure-overload. The anti-inflammatory effect of sildenafil has been demonstrated in pathological conditions of diabetes [23,27], kidney diseases [28] and neuronal disorders [29]. In particular, intensive studies have been performed in diabetes. Given that endothelial cells play a crucial role by releasing inflammatory mediators, it is reasonable to speculate that reduction of vascular inflammation by sildenafil might be a significant contributor to ameliorating early molecular derangement in both ventricles in the current study, besides its direct cardiac Gq-inhibitory effects from cGMP-PKG signaling. Efficacy and safety of sildenafil treatment in pulmonary arterial hypertension: A systematic review.

• Sildenafil was first approved for erectile dysfunction treatment in the late 1990s.
• Its effectiveness is dose-dependent, but higher doses do not always mean better results.
• Overdosing may lead to priapism, a painful and prolonged erection requiring medical help.
• The drug is not intended for recreational use and misuse can be dangerous.
• Individuals with heart conditions should avoid high doses like 100g without medical approval.

Chronic inhibition of cyclic GMP phosphodiesterase 5A prevents and reverses cardiac hypertrophy.

• Sildenafil 100g is rarely prescribed and considered an experimental or off-label dose.
• Like all medications, it should only be used as directed by a healthcare professional.
• Overdose signs include severe hypotension, vision loss, or chest pain.
• Use with caution in patients with liver or kidney impairment.
• Avoid alcohol consumption when using sildenafil, especially at high doses.

PDE5-inhibition with sildenafil improves left ventricular diastolic function, cardiac geometry and clinical status in patients with stable systolic heart failure: results of a 1-year prospective, randomized, placebo-controlled study. Walker DK, Ackland MJ, James GC, Muirhead GJ, Rance DJ, Wastall P, et al. Investigation of the freely available easy-to-use software “EZR” for medical statistics.

• Sildenafil was initially developed to treat hypertension and angina.
• The typical prescribed dose is up to 100mg, but only under medical supervision.
• Recreational misuse of high doses can result in serious health issues.
• Educate yourself about the potential risks and proper use of sildenafil.
• The drug works best when taken about 30-60 minutes before activity.