The Role of Sildenafil in Pulmonary Arterial Hypertension

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• 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.

Programme for Rare Diseases (EJPRD) (CureMILS to A.

Supporting information

In mouse brain, Prkg1 is known to be highly expressed in Purkinje cells, where its selective depletion results in motor learning defects.107 Here, we found that treatment with sildenafil increased Prkg1 levels in LS mice and some LS pigs, potentially promoting neuronal morphogenesis and connectivity. In addition to its neurological impact, sildenafil might induce mitochondrial biogenesis and oxygen consumption,108,109 as PRKG1 may represent a regulator sildenafil citrate tablets 150 mg of energy homeostasis.110 This is supported by our findings showing that PRKG1 inhibition blunted MMP normalization by sildenafil. Sildenafil also reversed changes in mitochondrial cristae junction distributions that may reflect cristae morphology defects caused by MT-ATP6 variants.45 We postulate that the bioenergetic improvement and MMP normalization by sildenafil may be related to its action on calcium homeostasis. Modulation of BKCa channels has been implicated in the sildenafil effect in other disease contexts77,78 and neuronal calcium signaling can be mediated by PRKG1.111,112 However, because PRKG1 protein levels were not fully normalized in all LS models, it is possible that sildenafil might enhance PRKG1 enzymatic activity rather than its protein abundance.56 In fact, continuous application of the cGMP analog 8-Br-cGMP can reduce PRKG1 expression.113 Further dissection of this pathway is required. Whether the restorative effects of sildenafil seen in LS are linked to its vasodilatory mechanisms32 remains to be studied.

S4 Fig. Western blot of t-ERK1/2 in the LV myocardium.

The increase in blood flow and oxygen delivery to muscle and brain tissue may potentially contribute to beneficial metabolic effects. Sildenafil led to vascular and metabolic improvements in individuals with AD114 and in subjects with vascular cognitive impairment.115 The effect of sildenafil on the vasculature32 and the beneficial consequences of hypoxia seen in animal models of LS22,23 might indicate that modulation of brain vascularization and associated oxygenation116 could represent important therapeutic targets in LS. Our findings underscore the power of conducting drug discovery studies driven by iPSC models. Similar strategies could be applied to other neurological diseases for which effective model systems are lacking. Considering that mitochondria play a crucial role in cellular health and brain function and homeostasis,117,118,119 understanding the potential effects of PDE5i in mitochondrial diseases may also have important implications in the context of common aging-related neurological disorders. Prigione, O.P., W.J.H.K., A.D.-S.,

• Sildenafil can cause side effects such as headaches, flushing, or nasal congestion.
• At high doses, the risk of side effects and adverse reactions increases significantly.
• Combining sildenafil with nitrates can cause life-threatening blood pressure drops.
• The medication is available by prescription in various formulations and strengths.
• Proper dosing and medical supervision are essential for safe usage of sildenafil 100g.

P.L., E.B., A.S., and F.E.

); the Austrian Science Fund

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The effect was evident across all dimensions of NPMDS (Figures 6H–6J). In patients 1, 5, and 6, sildenafil was started during a metabolic crisis, which resolved rapidly and led to a rapid drop in NMDAS/NPMDS. The subsequent NPMDS/NMDAS increase seen in patient 1 may be due to natural progression of the disease or reduced compliance. Overall, chronic treatment on an individual basis with sildenafil showed clinical improvements in LS patients carrying MT-ATP6 variants. Sildenafil is a well-studied molecule in clinical applications.32 In addition to its use in adult men with erectile dysfunction,96 sildenafil can treat PAH and rare lymphatic malformations in children.39,40,41,42 Recent studies suggest that it might be a repurposable candidate for nervous system disorders.97 Sildenafil use was associated with reduced risk of developing Alzheimer’s disease (AD) and promoted neuronal outgrowth in AD iPSC-derived neurons.98,99 Sildenafil lowered cognitive decline in mouse models of Huntington’s disease (HD)100,101 and increased motor and cognitive performance in HD individuals.102 It also alleviated neuropathological signs in animal models of multiple sclerosis103 and ischemic stroke.104 In this study, we found that sildenafil might slow down the neurological decline of the severe mitochondrial brain disease LS.

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Sildenafil increased the lifespan of sildenafil citrate 100 mg two mammalian models of LS. One treated pig remained clinically stable for over 6 months, an unprecedented health span and lifespan extension in this model. In treated LS individuals, the reduction of the upward sloping trend in the NPMDS/NMDAS score over time possibly implies that sildenafil modified the disease trajectory. Sildenafil releases cGMP, which has a wide range of functions, likely resulting in a poly-pharmacological mode of action.32 Sildenafil showed enhanced neurogenesis in mice,105,106 as cGMP and PRKG1 modulated neurotransmitter release, neuronal survival, and neurite formation.82,83,84,85 Mice deficient for Prkg1 exhibit impaired axon guidance and connectivity.86 Consistently, we found that the signature of sildenafil primarily involved the regulation of neurodevelopment, and it acted specifically on progenitors and radial glia populations. LS neural cells showed reduced PRKG1 levels, and knockdown of PRKG1 in healthy neurons recapitulated the branching defects seen in patient cells. (FWF) (10.55776/I5184 and 10.55776/F78 to F.E.

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Information requests regarding Leigh syndrome patients and their treatment should be directed to the lead clinical scientist, Markus Schuelke ([email protected]). There are restrictions on the availability of patient-derived iPSCs used in this study due to our ethical approval, which does not support sharing with third parties without a specific amendment and does not allow performing genomic studies, in order to respect the European privacy protection law. Raw and processed RNA-seq data are deposited in the NCBI Gene Expression Omnibus (GEO) or Sequence Read Archive (SRA): bulk RNA-seq NPC dataset at GEO: GSE292178; bulk RNA-seq brain organoids dataset at SRA BioProject: and snRNA-seq brain organoids dataset at GEO: GSE293573. The metabolomics NPC dataset is deposited in the MassIVE repository at MassIVE: Codes to reproduce our snRNA-seq results are available at: All original code is available in this paper’s STAR Methods. Any additional information required to reanalyze the data reported in this paper is available from the lead contact upon request. ); the United Mitochondrial Disease Foundation (UMDF) and the Leigh Syndrome International Consortium (LSIC) (to A.

Prigione and D.-F.D.

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From patient 1, we also obtained iPSCs (line ATP6_7), which were used to generate NPCs and brain organoids (Figure S10H). When selecting the sildenafil dosage, we referred to the trial STARTS-1 (Sildenafil in Treatment-Naive Children, Aged 1 to 17 Years, With Pulmonary Arterial Hypertension)41 and the trial STARTS-240 in children with PAH. Given the potential toxic effects of high dosages, we only considered low (0.66–1.49 mg/kg/day) or medium dosages (1.50–3.00 mg/kg/day). Two patients/guardians opted for low dosages and four for medium dosages. To monitor the occurrence of adverse reactions, we asked patients/guardians to respond to a questionnaire on side effects after 6 months of sildenafil use (Table S4).

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In patient 3, sildenafil had to be discontinued due to a rash, even though the frequent episodes of sudden muscle weakness were resolved during sildenafil medication and returned once the drug was discontinued (Tables 1 and S4). In all the other cases, sildenafil was well tolerated (Table S4), leading to improvement in motor function and development (Tables 1 and S3). Patient 5 showed protection from metabolic crises that had occurred nearly monthly before sildenafil treatment, while mild improvements in cognitive abilities were reported for patients 4 and 6 (Tables 1 and S3). We assessed disease progression using the NPMDS92 or the Newcastle Mitochondrial Disease Adult Scale (NMDAS).93 These rating scales cover multiple aspects of mitochondrial disease, including clinical assessments and quality of life. Remarkably, NPMDS/NMDAS scores of the six sildenafil-treated patients decreased or showed reduced rates of increase over time (Figure 6G). ); the foundations People Against Leigh

• 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.

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• Sildenafil operates by increasing blood flow to the penis during arousal.
• It is a phosphodiesterase type 5 (PDE5) inhibitor used in sexual medicine.
• The standard dose ranges from 25mg to 100mg, but 100g refers to a very high, rare dose.
• Users should always adhere to prescribed doses to avoid health risks.
• Never attempt to self-medicate with high doses like 100g without professional advice.

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We reported clinical effects observed in a small cohort of mitochondrial disease patients. It is imperative that the safety and efficacy of sildenafil in patients with LS be assessed in a larger, double-blind, randomized, placebo-controlled trial. High sildenafil dosages were associated with toxicity in LS cardiomyocytes and microhemorrhages in newborn LS pigs. Although the doses that we used in LS patients have been found safe for neonatal encephalopathy,120,121 particular precautions should be taken in infants due to the low sildenafil clearance in postnatal age that leads to longer half-lives in neonates compared with adults.122 Sildenafil dosage should therefore be carefully monitored in treated children. Other more potent PDE5i, such as vardenafil (IC50 = 0.091 ± 0.031 nM) and tadalafil (IC50 = 1.8 ± 0.4 nM),123 could be considered as alternatives to sildenafil in patients with mitochondrial disorders.124 The predictions of the mathematical model and the role of mitochondrial calcium fluxes, including the mitochondrial calcium uniporter and other ion channels that could be directly modified by cGMP or PRKG1, warrant further investigation to elucidate the effects of sildenafil in neural cells.

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We identified here putative sildenafil-responsive genes, but additional work is needed to dissect their biological role in LS. Besides experiments in pigs, which were carried out blue sildenafil only in male animals, both sexes were investigated in all other experiments in mice and iPSCs, as well as in treatments on an individual basis. Nonetheless, we did not assess the influence of sex or gender on disease phenotypes and treatment outcomes. Future studies are required to address these aspects in the context of sildenafil treatment in mitochondrial diseases. Further information and requests for resources and reagents should be directed to and will be fulfilled by the lead contact, Alessandro Prigione ([email protected]). Cure ATP6, and Mitocon Italy (to A.