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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.
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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). 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.
- Sildenafil 100g refers to a high dosage of the medication used to treat erectile dysfunction.
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- Overuse can cause severe side effects like dangerous drops in blood pressure.
- Sildenafil 100g is typically used only under strict medical supervision for specific cases.
Studies have documented anti-inflammatory properties of sildenafil [12,22–24], which might be potentially linked to Gq-signal de-activation.
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We next tested if inflammation might underlie the activation of pathological molecular signaling pathways in the RV during LV pressure-overload. 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).
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For calcineurin activity, we assessed RCAN1 (regulator of calcineurin 1) gene expression levels. RCAN1 is extremely responsive to changes in calcineurin activity in vivo [19] and thus its expression levels have been used as reflecting calcineurin activity [20,21]. ERK was significantly phosphorylated in the RV as well as in the LV (Fig 4A and 4B), and calcineurin activity was also increased in the RV similarly to the LV (Fig 4C). Sildenafil treatment significantly inhibited both these signals in the RV and the LV (Fig 4). These results suggest that the RV undergoes early hypertrophy molecular changes similar to the LV in the absence of RV afterload increase at the very early stage of LV pressure-overload, and that sildenafil treatment inhibits such molecular remodeling process in both ventricles. These results support the potential role for inflammation in this process.
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The other analyses were performed with Excel 2013 (Microsoft, Redmond, WA). P values less than 0.05 were considered significant. To examine early molecular alterations in the RV following LV disease, we used a mouse model of LV pressure-overload (TAC), in which LV was exposed to moderate pressure-overload created by surgical constriction of transverse aorta and examined the effect of concomitant sildenafil treatment. Two-day TAC induced only mild increase in the total heart weight (~10%), and this was inhibited by sildenafil treatment (Fig 1A). At this early stage, RV free wall weight and lung weight was neither impacted by TAC nor by sildenafil treatment (Fig 1A).
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M-mode transthoracic echocardiography showed minimal change in LV chamber size (LVEDD: LV end-diastolic dimension; LVESD: LV end-systolic dimension) and function (LVFS: LV fractional shortening) (Fig 1B). These results indicate that RV was apparently unaffected at this early stage when LV developed hypertrophy in response to the loading stress. (A) Postmortal assessment of heart, ventricles, and lung. Heart weight (HW), RV weight (RVW), and lung weight normalized to tibial length (TL) is shown. Transverse aortic constriction (TAC) for two days increased HW, and sildenafil prevented this increase.
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Neither RVW nor lung weight was affected by two-day TAC with or without sildenafil treatment. LV end-diastolic dimension (LVEDD), LV end-systolic dimension (LVESD), and LV fractional shortening (LVFS) are shown. Two-day TAC altered neither LV dimensions nor function. Results are expressed as mean ± s.e.m. TAC 2d Veh, TAC for 2 days with vehicle treatment; TAC 2d Sil, TAC for 2days with sildenafil treatment. (A) mRNA expression of IL1b and IL6, normalized to GAPDH.
| Parameter | Description | Typical Value |
|---|---|---|
| Bioavailability | Percent absorbed into bloodstream | ~40% |
| Tmax (time to peak) | Time to reach maximum plasma concentration | 30-120 minutes |
| Half-life | Duration of drug activity | 4-5 hours |
| Metabolism | Main route | Liver (CYP3A4 enzyme) |
| Excretion | How the drug leaves the body | Mainly feces, some urine |
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. Dexamethasone suppressed up-regulation of RCAN1 and BNP in RV and LV myocardium induced by two-day TAC.
- Sildenafil may cause temporary visual disturbances; report any persistent changes to a doctor.
- It should not be used with certain medications due to the risk of interactions.
- Some users misuse sildenafil for enhancing athletic performance, which is unsafe.
- Correct dosing ensures effectiveness while minimizing side effects.
- Be aware of counterfeit or unregulated sources when purchasing sildenafil.
TAC 2d Veh, TAC for 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.
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n.s., not significant by one-way or two-way analysis of variance; *, p<0.05 versus sham group; †, p<0.05 versus TAC 2d Veh group. We also performed hemodynamic studies using a micro-catheter placed in both ventricles for detailed hemodynamic assessment. While TAC induced significant increase in LV peak systolic pressure (LVP sys, 139mmHg), compared to sham controls (89 mmHg), RV mean pressure (RVP mean) was not yet affected (Fig 2A). These results confirm the absence of RV hemodynamic load at this early stage of the LV disease caused by moderate LV pressure-overload. Concomitant sildenafil treatment did not lower systolic LV peak pressure as reported previously [15], or affect RV mean pressure (Fig 2A).
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Neither dP/dtmax (peak rate of ventricular pressure rise) nor dP/dtmin (peak rate of ventricular pressure decline) was altered by the moderate TAC in either ventricles at this early stage (Fig 2B). Importantly, however, relaxation time constant (tau) was prolonged in the LV, again consistent with the general notion that the impairment of LV relaxation occurs early before systolic function starts to deteriorate in heart diseases. Sildenafil treatment normalized LV tau, while the other parameters examined were not altered (Fig 2B). (A) Peak systolic left ventricular pressure (LVP sys) and mean right ventricular pressure (RVP mean). Transverse aortic constriction (TAC) for two days increased systolic LV pressure, but had no effects on RV pressure.
Statistical analysis
(B) Peak rate of ventricular pressure rise (dP/dtmax), peak rate of ventricular decline (dP/dtmin), and relaxation time constant (tau). LV tau was prolonged by two-day TAC, which was normalized by sildenafil. n.s., not significant by one-way analysis of variance; *, p < 0.05 versus sham group; §, p = 0.05 versus sham group; ‡, p = 0.07 versus TAC 2d Veh group. To elucidate molecular changes in both ventricles, we first determined messenger RNA (mRNA) expression levels for brain natriuretic peptide (BNP) and beta myosin heavy chain (B-MHC), both markers for fetal gene recapitulation. Interestingly, BNP mRNA levels were markedly increased in the RV free wall myocardium as well as in the LV myocardium in two-day TAC hearts (Fig 3A). It is therefore tempting to speculate that earlier intervention with PDE5 inhibitors might confer additional clinical benefits in this pathology.
- Sildenafil's patent expired in many countries, leading to generic versions.
- The cost of sildenafil can vary depending on the dose and brand.
- Use of sildenafil in women is not approved, and its safety in females is unestablished.
- Consultation with a healthcare provider is crucial before starting high doses.
- Always verify your medication's source to ensure authenticity and safety.
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.
- High-dose sildenafil should only be used in rare cases and under strict medical supervision.
- It is essential to follow prescribed guidelines to avoid overdose risks.
- Sildenafil is contraindicated in patients taking certain prescription drugs.
- Regular check-ups are recommended when using sildenafil long-term.
- Be cautious about online sources; genuine medication ensures safety and effectiveness.
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].
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Sildenafil treatment potently inhibited BNP expression levels in both ventricles, whereas it had no impact on the latter. Interestingly, pro-inflammatory marker genes, including interleukin-1 beta (IL1b) and interleukin-6 (IL6), were also up-regulated in the RV free wall as well as in the LV myocardium (Fig 3B), associated with increased nicotinamide adenine dinucleotide phosphate oxidase 2 (NOX2) but not NOX4 mRNA levels (Fig 3C), suggesting the involvement of inflammation as well as oxidative stress in the RV and LV pathophysiology at this early stage of the LV disease. Sildenafil treatment significantly inhibited the mRNA increase in IL1b, IL6 and NOX2 in LV, and also attenuated the increase in these genes in RV (Fig 3B and 3C). These results suggest the anti-inflammatory and anti-oxidative impacts of sildenafil. (A) Expression of fetal genes as markers of cardiac hypertrophy, encoding for BNP and B-MHC, normalized to GAPDH.
S4 Fig. Western blot of t-ERK1/2 in the LV myocardium.
Transverse aortic constriction (TAC) for two days induced marked increase in BNP mRNA levels in the RV myocardium as well as in the LV myocardium, which was prevented by sildenafil. Expression of B-MHC was increased sildenafil 130mg by two-day TAC in LV, but was not affected by sildenafil. (B) Expression of inflammatory cytokines, IL1b and IL6, normalized to GAPDH. IL1b and IL6 was up-regulated by TAC in both ventricles. Sildenafil inhibited both in LV, and also attenuated both in RV.
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(C) Expression of genes for enzymes inducing oxidative stress, NOX2 and NOX4, normalized to GAPDH. Expression of NOX2 was increased by TAC in both ventricles, and suppressed by sildenafil in LV. TAC and sildenafil had little influence on NOX4 expression. n.s., not significant by one-way analysis of variance; *, p<0.05 versus sham group; ✝, p<0.05 versus the TAC 2d Veh group. We also examined RV hypertrophic signaling pathways at this early stage of LV disease, including ERK and calcineurin; the former known to contribute to concentric hypertrophy and the latter to pathologic remodeling [16–18]. have demonstrated that PDE5 inhibition with Tadalafil improves mitochondrial energy metabolism and LV cardiac function [11].