Pluripotent stem-cell-based screening uncovers sildenafil as a mitochondrial disease therapy
Cells were washed three times with ice-cold DPBS, detached using a cell scraper, transferred to pre-chilled 1.5 ml tubes and centrifuged at 1,000-3,000 rpm for 10 min at 4 °C.
Sildenafil Citrate & Vardenafil Tablets
To estimate glycolytic pathway activity in single cells, we leveraged the AUCell package (v. 1.26.0)142 and the ‘Glycolysis’ gene set in the ‘Hallmark’ database accessed from the MsigDB package (v 7.5.1).143 Plots were generated with ggplot2 (v. 3.5.1) and piping using dplyr (v. 1.1.4) and visualized with uniform manifold approximation and projection (UMAP). We carried out proteomics using mass spectrometry (MS) for four MT-ATP6 mutant NPC lines (ATP6_2, ATP6_4, ATP6_5, and ATP6_7) and four healthy control NPC lines (CTRL_1, CTRL_2, CTRL_3, and CTRL_4) with n=3 biological replicates per condition that were treated with either DMSO or 10 μM sildenafil in DMSO for 16 h. Subsequently, the supernatant was removed, and intact cells were snap-frozen.
| Product | Dosage | Quantity + Bonus | Price | |
|---|---|---|---|---|
| Viagra Generic | 100mg | 90 + 6 Pills | 129.02€ 122.88€ | |
| Viagra Generic | 25mg | 30 + 4 Pills | 47.97€ 45.69€ | |
| Kamagra Soft Tabs | 100mg | 12 Pills | 57.55€ 54.81€ | |
| Kamagra | 100mg | 360 + 6 Pills | 839.95€ 799.95€ | |
| Viagra Generic | 25mg | 60 + 4 Pills | 71.99€ 68.56€ | |
| Viagra Generic | 150mg | 360 + 10 Pills | 423.48€ 403.31€ | |
| Viagra Generic | 200mg | 120 + 8 Pills | 204.80€ 195.05€ | |
| Kamagra Oral Jelly | 100mg | 90 + 8 Sachets | 303.56€ 289.10€ | |
| Kamagra Oral Jelly | 100mg | 220 + 18 Sachets | 662.24€ 630.70€ | |
| Viagra Generic | 150mg | 30 + 2 Pills | 72.32€ 68.88€ | |
| Viagra Generic | 100mg | 30 + 4 Pills | 60.91€ 58.01€ | |
| Viagra Generic | 150mg | 270 + 10 Pills | 326.61€ 311.06€ | |
| Viagra Generic | 200mg | 180 + 10 Pills | 277.56€ 264.34€ | |
| Viagra Generic | 150mg | 60 + 4 Pills | 111.25€ 105.95€ | |
| Viagra Generic | 50mg | 360 + 10 Pills | 225.33€ 214.60€ | |
| Kamagra Soft Tabs | 100mg | 32 Pills | 120.11€ 114.39€ | |
| Kamagra Oral Jelly | 100mg | 63 + 7 Sachets | 224.18€ 213.50€ |
Lysates were denatured at 95 °C for 10 min shaking at 1,000 rpm in a thermal shaker and sonicated in a water bath for 10 min.
Supporting information
Confocal microscopy revealed a tubular mitochondrial network in both NPC cultures, with no evident phenotypic alterations in LS NPCs. STED imaging showed a largely uniform distribution of MIC60 clusters along mitochondrial tubules in control NPCs, whereas in LS NPCs, MIC60 appeared to accumulate at the sides of mitochondrial tubules. To investigate this phenotype, we manually analyzed the MIC60 pattern across the mitochondrial tubules in approximately 300 images. A semi-automated MATLAB-based analysis was employed to assess the MIC60 distribution in LS NPCs (ATP6_2) and control NPCs (CTRL_1). After blinding, individual elongated mitochondria were manually analyzed.
S3 Fig. Western blot of p-ERK1/2 in the LV myocardium.
The mitochondrial centerline was determined by marking discrete points along the mid-axis, which were then fitted to a Bézier curve to approximate the mitochondrial central axis. The fluorescence intensity profile across the mitochondrial transverse axis was measured every 10 nm at a length of 600 nm with its center at the Bézier curve. The profiles were averaged for all selected isolated mitochondrial fragments in a single STED image. A homogeneous MIC60 distribution results in a fluorescence intensity profile with a broad plateau at the central maximum along the transversal mitochondrial axis. MIC60 accumulation at the outer edge of the mitochondria creates a central intensity dip.
What strengths does Viagra come in?
LS NPCs revealed a clear dip in the distribution of fluorescence intensity. For bulk transcriptomics of NPCs, we used four MT-ATP6 mutant NPC lines (ATP6_2, ATP6_4, ATP6_5 and ATP6_7.) and four healthy control NPC lines (CTRL_1, CTRL_2, CTRL_3 and CTRL_4) either treated for 16 h with 0.1 % of DMSO alone or with 10 μM sildenafil resuspended in 0.1 % DMSO. We used n=3 biological replicates per condition. Total RNA was isolated from pelleted NPCs using the NucleoSpin RNA Plus kit (Macherey Nagel) and eluted in 30 μl RNase-free H2O. RNA concentration was measured with NanoDrop 2000. The protein concentration of each sample was measured with a BCA protein assay kit (23252, Thermo Fisher Scientific).
| Brand Name | Manufacturer | Typical Dosage Form | Price Range (per 100g) |
|---|---|---|---|
| Viagra | Pfizer | Tablets, Gel | $300 - $500 |
| Kamagra | Ajanta Pharma | Oral Jelly, Tablets | $100 - $250 |
| Sildenafil Citrate | Generic Pharma | Powder, Tablets | $80 - $200 |
| Sildenafil Plus | Local Pharmacies | Capsules | $150 - $300 |
500 ng protein was used per sample and diluted with a dilution buffer containing 10 % acetonitrile and 25 mM Tris-HCl, pH 8.0, to reach a 1 M GdmCl concentration.
More about Viagra (sildenafil)
Differential expression analysis between the two timepoints was performed using DESeq2 (Wald test, Benjamini-Hochberg p-value adjustment). The values depicted in the boxplots (expression, y axis) in Figures S6E and S6F are variance-stabilized counts obtained with DESeq2’s vst(), which normalized for sequencing depth and applies a transformation that is approximately log2 for large counts but reduces variance for low counts. For bulk transcriptomics of brain organoids, total RNA was isolated from day 70 cortical brain organoids generated using the first protocol.62,134 We used five pelleted organoids per sample with n=3 biological replicates per condition, grown under normal conditions (CTRL_1, CTRL_2, ATP6_4 and ATP6_7), or treated with 10 μM sildenafil for 24 h (ATP6_4 and ATP6_7). Total RNA was isolated using the RNeasy Mini Kit by Qiagen. RNA concentration as well as purity was measured at the Nanodrop Spectrophotometer ND1000 (peQlab) using ND-1000 software (V3.8.1).
Sildenafil Tablets or Oral Suspension for PAH
Total RNA was mixed with 1 μg of a DNA oligonucleotide pool comprising 50-nt long oligonucleotide mix covering the reverse complement of the entire length of each rRNA (28S rRNA, 18S rRNA, 16S rRNA, 5.8S rRNA, 5S rRNA, 12S rRNA), incubated with 1U of RNase H (Hybridase Thermostable RNase H, Epicentre), purified using RNA Cleanup XP beads (Agencourt), DNase treated using TURBO DNase rigorous treatment protocol (Thermo Fisher Scientific) and purified again with RNA Cleanup XP beads. rRNA-depleted RNA samples were further fragmented and processed into strand-specific cDNA libraries using TruSeq Stranded Total LT Sample Prep Kit (Illumina) and sequenced using the NovaSeq 6000 system with stranded technology, generating paired-end reads of 150 bp. Raw RNA sequencing data were processed to generate FASTQ files using Illumina bcl2fastq. Briefly, base calling was performed using Real-Time Analysis (RTA) software, and adapter sequences were trimmed. The resulting BCL files were converted to FASTQ format, followed by quality control assessment using FastQC before downstream analysis.
Revatio for Oral Suspension
The preprocessing of the FASTQ raw sequencing files was performed with nfcore/rnaseq (version 3.12.0) pipeline. Briefly, reads were trimmed with Trim Galore! (version 0.6.10) and mapped to the human genome (GRCh38 assembly) using STAR (version 2.7.10a) aligner. For both NPCs and brain organoids samples, we performed different comparisons: i) LS with DMSO vs. controls with DMSO (disease signature), ii) 200mg sildenafil citrate LS + sildenafil vs. Then, proteins were digested with LysC (Roche; enzyme to protein ratio 1:50, MS-grade) shaking at 800 rpm at 37 °C for 3.5 hours.
Shipping Information
DGEs were further processed in R (v. 4.4.1) using Seurat (v. 5.1.0).139 Filtered DGEs were imported using the function “Read10x” and only genes detected in at least 5 cells were kept for downstream analyses. Similarly, cells with less than 200 genes and 3,000 unique transcripts or more than 0.5 % mitochondrial transcripts sildenafil film tablet were discarded. After merging all samples in a single Seurat object, we performed gene expression normalization and scaling for each sample independently using SCTransform.140 We performed unbiased clustering and dimensionality reduction using the first 20 principal components on all samples together.
Warnings for other groups
Clusters were manually annotated in 7 cell types analyzing their marker genes (Table S1). To identify differential genes induced by MT-ATP6 variants and sildenafil treatment in a robust and reproducible way, we performed a pseudo-bulk analysis using the DESeq2 package140 (v. 7.5.1), as described previously.141 Pseudo-bulk analysis was used to determine differentially expressed genes within the individual populations (Table S1). For each population, we generated a pseudo-bulk expression profile for each organoid by summing the expression of 250 randomly selected cells. We filtered genes with less than 50 counts in at least 2 samples, normalized expression values by library size, estimated negative binomial dispersions.
Dosage adjustments
We performed different comparisons: i) LS + DMSO vs. controls + DMSO (disease signature), ii) LS + sildenafil vs. LS + DMSO (sildenafil signature), iii) controls + sildenafil vs. controls + DMSO (negative control test). For all comparisons, we identified differentially expressed genes and adjusted p value was calculated using Bonferroni correction for multiple testing correction. The digestion mixture was diluted again with the same dilution buffer to reach 0.5 M GdmCl, followed by tryptic digestion
- Side effects at high doses like 100g can include vision impairment and hearing loss.
- Sildenafil can cause headaches, dizziness, or temporary vision changes.
- Patients taking medications for blood pressure should consult their doctor beforehand.
- The drug's effect lasts around 4-6 hours, but duration varies.
- Misuse or overdose increases the risk of serious health complications.
(Roche, enzyme to protein ratio 1:50, MS-grade) and incubation at 37 °C overnight in a thermal shaker at 800 rpm.
Kamagra Fx 100mg Oral Jelly
LS + DMSO (sildenafil signature), iii) controls + sildenafil vs. controls + DMSO (negative control test). Transcript counts were determined using Salmon (version 1.10.1). DESeq2 (version 1.40.2)137 was used to identify differentially expressed genes in the NPC samples or in brain organoid samples (Table S1) (Benjamini-Hochberg-adjusted p-value 0.05). Gene Ontology (GO) enrichment analysis was performed to identify biological processes (BP) and cellular components (CC) using the enrichGO function within ClusterProfiler (4.8.3), using the annotations of org.Hs.eg.db (version 3.18.0).
Viagra Tablets
Visualizations were generated with ggplot2 (version 3.5.1). For single-nucleus RNA sequencing (snRNAseq), we used day 72 brain organoids generated with the second protocol138 from control iPSCs (CTRL1) and LS iPSCs (ATP6_7). Brain organoids were treated with either DMSO or 10 μM sildenafil resuspended in DMSO for 45 days from day 27 to day 72. We used 15 pelleted organoids per sample (n=8 samples) with n=2 biological replicates per condition (n=120 cortical brain organoids in total). snRNA-seq was performed using the 10X Genomics Chromium system, following the manufacturer's protocol.
More FAQ
Nuclei were isolated using mechanical dissociation with gradient centrifugation and stained with DAPI to assess nuclear integrity. Barcoding and cDNA amplification were carried out using the Chromium Single Cell 3' (vNext) Reagent Kit. Libraries were prepared and sequenced on the Illumina NovaSeq 6000, generating paired-end reads of 100 bp. Data processing, including demultiplexing, alignment to the reference genome (GRCh38-2020-A), and gene quantification, was performed using Cell Ranger (v7.2.0) from 10x Genomics with default parameters. To generate digital gene expression (DGE) matrices for each sample. Peptides were acidified with formic acid to a final concentration of 2 %.
- 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.
LC-MS/MS was performed by nanoflow reversed-phase liquid chromatography (Dionex Ultimate 3000, Thermo Fisher Scientific) coupled online to a timsTOF SCP mass spectrometer (Bruker Daltonics) using the data-independent acquisition (DIA) method with parallel accumulation serial fragmentation (PASEF).
| Country/Region | Approval Status | Regulatory Body |
|---|---|---|
| United States | Approved for ED, PAH | FDA |
| European Union | Approved, generic available | EMA |
| India | Approved, widely available | CDSCO |
| Canada | Approved | Health Canada |