Important Safety Information for Sildenafil Users

We fixed NPCs and neurons grown on

Property	Description	Value
Molecular Formula	-	C22H30N6O4S
Molecular Weight	-	474.58 g/mol
Melting Point	-	187°C
Solubility	In water	Very low
pKa	-	6.8

Matrigel-coated coverslips with 4 % PFA (Thermo

• 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.
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Fisher Scientific) in DPBS for 20 min

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Supernatants were obtained by centrifugation at 16,000 x g at 4 °C for 10 min and subjected to LC-MS/MS sildenafil quantification applying the multiple reaction monitoring (MRM) approach. Water (eluent A) and acetonitrile (eluent B), both acidified with 0.1 % formic acid, were pumped with 0.4 ml/min. Elution of sildenafil and its internal standard was achieved with a 10-min linear gradient from 5 % to 90 % eluent B. Total run-time was 17 min including re-equilibration of the LC system. MS/MS analyses were carried out using an Ultivo triple-quadrupole mass spectrometer (Agilent Technologies) operating in the positive electrospray ionization mode (ESI+).

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The following ion source parameters were set: sheath gas temperature, 400 °C; sheath gas flow, 12 l/min of nitrogen; nebulizer pressure, 20 psi; drying gas temperature, 100 °C; drying gas flow, 7 l/min of nitrogen; capillary voltage, 3.0 kV; nozzle voltage, 0 kV. The following mass transitions were recorded (fragmentor voltage [FV] and collision energies [CE] in parentheses): sildenafil: m/z 475.2 → 58.0 (FV: 220 V, CE: 68 eV, quantifier), m/z 475.2 → 100.0 (FV: 220 V, CE: 28 eV), m/z 475.2 → 283.1 (FV: 220 V, CE: 44 eV); d3-sildenafil: m/z 478.2 → 60.9 (FV: 220 V, CE: 68 eV, quantifier), m/z 478.2 → 103.0 (FV: 220 V, CE: 28 eV), m/z 478.2 → 283.1 (FV: 220 V, CE: 44 eV). Peak areas were determined with MassHunter Software (Agilent Technologies) and sildenafil was directly quantified via its internal standard d3-sildenafil that was concentrated to 8 nM in the samples. Heteroplasmy levels and mtDNA haplotypes in the whole exome sequencing (WES) datasets were determined using the software MToolBox v.1.146,147 Results were visualized in the IGV viewer v2.16.148 Heteroplasmy levels of the MT-ATP6 mutations in fibroblasts, iPSCs, and NPCs were determined using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis, as described before.27 Genomic DNA was isolated using the Nucleo-Spin Tissue kit (Macherey-Nagel). We used restriction enzyme StuI (NEB, R0187, 10,000 units/ml) for the m.9185T>C mutation (wild-type: 24+90 pb, mutation: 114 pb), HpaII (NEB, R0171, 10,000 units/ml) for m.8993T>C and m.8993T>G (wild type: 25+155 bp; mutant: 180 bp), XbaI (NEB, R0145, 10,000 units/ml) for m.9176 T>G (wild type: 24+155 bp, mutant: 179 bp).

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The percentage of cleaved versus uncleaved fragments was determined by capillary electrophoresis and laser detection of the FAM-labelled RFLP-fragments using the 3,500 Series Genetic Analyzer (Applied Biosystems, RRID:SCR_021901) and normalized to a standard curve of known degrees of heteroplasmy. cMRI was performed for the six patients with LS carrying MT-ATP6. For Patient 1, imaging was carried out at 16.5 years of age canada sildenafil and showed areas of increased T2-signal intensity in the Putamen and Nucleus caudatus on both sides (Figure 6E) and at the perisylvian gray matter (Figure S12H). For patient 2, imaging was carried out at 2.2 years of age and showed lesional areas in the Putamen and Nucleus caudatus in both T2-weighted images (Figure 6E) and Fluid Attenuated Inversion Recovery (FLAIR) images (Figure S12H). For patient 3, imaging was carried out at 5 years of age (Figure 6E) and at 14 years of age (Figure S12H). at RT and washed two times with DPBS.

• 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.

For permeabilization, we incubated the fixed cells with a

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blocking solution containing 10 % normal donkey serum (DNS) (Merck

Sildenafil Enhances Renal Blood Flow but Does Not Protect Against Ischaemia Reperfusion Injury in a Model of Donation after Circulatory Death Kidney Transplantation

At birth, the animals were separated from the sow and transferred to an incubator kept at 35 °C. Sildenafil was always administered at the same time and dissolved in milk. The veterinarian ensured that the entire dose was consumed. For biochemical and immunoblot experiments, we isolated sildenafil tablets lp 100 mg the basal ganglia of newborn male pigs: 3 SURF1 KO, 3 SURF1 KO treated with sildenafil (2.1 mg/kg/day), and 3 sex and age-matched WT. Spectrophotometric analyses of complex IV (CIV) and citrate synthase (CS) activities were carried out as previously described.135 CIV activity was normalized to CS activity, an index of mitochondrial mass.

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For histological analysis, tissues were removed immediately after death, post-fixed in 4 % PFA at 4 °C for 48 h, cryoprotected in DPBS containing 30 % sucrose for 24 h at 4 °C, embedded in optimal cutting temperature (OCT) compound, and frozen on dry ice. Cryostat sections (10 μm thick) were then mounted on gelatin-coated glass slides. The sections were stained with hematoxylin and eosin (H&E). Images were acquired using a Nikon Eclipse E400 light microscope at 20 x or 40 x magnification. The sildenafil plasma concentration was monitored in three treated LS patients.

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EDTA blood was drawn in the morning before the first dose (trough level) and one hour after oral sildenafil application (peak level). Depicted time points in Figure 6D were separated by more than 3 months for each patient. The quantification was performed by Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS). The EDTA-blood sample was centrifuged at 3,000 x g for 10 min at 4 °C and the plasma was aliquoted and frozen at -80 °C until measurement. Proteins were precipitated by vortexing for 1 min and subsequent storage for 60 min at -20 °C. Millipore) and 1% Triton X-100 (Sigma-Aldrich) in DPBS with

Side Effect	Severity	Notes
Headache	Common	Usually mild
Flushing	Common	Transient
Dizziness	Common	Particularly when standing up quickly
Vision disturbances	Less common	Temporary, includes blue tint or blurred vision
Priapism	Rare	Needs urgent medical attention

0.05 % Tween 20 (Sigma-Aldrich) for 1 h at RT.

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• Sildenafil 100g is typically used only under strict medical supervision for specific cases.

We diluted primary antibodies in blocking solution and

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Pipeline setup and analysis were done with the software CELLCYTE Studio (Cytena). Channels were “enhanced contour” for confluency and “red channel” (600 ms, 9 dB) for toxicity. Pictures taken with the “enhanced contour” channel were analyzed with the software-specific protocol “Cell Confluence” with the following settings: 58 a.u. Pictures taken with “red channel” were analyzed with the software-specific protocol “object count” with the following settings: 30 a.u. Analysis results were exported to Excel and further processed with R studio. incubated them overnight at 4 oC on a shaker.

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Areas with increased T2-signal intensity at 5 years of age (Figure 6E) had spontaneously resolved at 14 years of age (Figure S12H). In patient 4, FLAIR imaging was performed at 35 years of age and areas of increased signal intensity at the Nuclei caudati on both sides (Figure 6E) and enlargement of the internal and external liquor spaces due to diffused brain atrophy (Figure S12H). For patient 5, imaging was performed at 4.5 months of age and showed T2-weighted images delayed myelination, enlarged external cerebral spinal fluid spaces, and a general frontal brain atrophy (Figure 6E). For patient 6, imaging was performed at 7.5 years of age and showed areas of increased T2-signal intensity in the Putamen, Pallidum, and Nucleus caudatus on both sides (Figure 6E) and in the cortical gray matter (Figure S12H). CellTiter-Glo assay (Promega) was used to determine cell viability based on cellular ATP concentration.

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NPCs were isolated using Accutase and seeded onto Geltrex-coated 96-well plates at a density of 1.5 x 105 cells/cm2 and incubated in NPC medium overnight at 37 °C and 5 % CO2. The day after, NPCs were treated with DMSO, FCCP+AA or sildenafil dilution series in 100 μl and incubated for 16 h at 37 °C and 5 % CO2. 50 μl Cell Titer-Glo reagent solution was added to each well and placed on a plate shaker (1 min, 100 rpm) and incubated at ambient temperature for 10 min to ensure cell lysis. 100 μl of the solution was transferred onto a new white wall, white bottom 96-well plate, and luminescence was measured using an EnSight multimode plate reader (Revvity). For proliferation, NPCs were seeded in a coated 96-well plate (30,000 cells/well) and incubated at 37 °C and 5 % CO2.

Animal models

Medium glucose concentration was either 21 mM or 4.5 mM, or glucose was substituted with galactose. For toxicity analysis, the medium was additionally supplemented with Incuyte dye red (Sartorius) to indicate dead cells. Supplemented medium was changed every other day. Over the course of the experiment, the well plates were placed in the Cellcyte X (Cytena) microscope with a 10 x objective. Four pictures of each well were taken every three hours. Next, the primary antibody was removed, and the wells were rinsed three times with DPBS.

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Follicles larger than 3 mm were aspirated, and cumulus-oocyte complexes (COCs) were selected and matured in vitro at 38.5 °C under 5 % CO2 for 42 h. One day before SCNT, donor cells were induced into quiescence via serum starvation (0.5 % FCS). On the day of SCNT, cells were trypsinized, washed, and resuspended in SOF-Hepes medium. Matured oocytes (with extruded polar body) were selected and zona pellucida was removed using 0.5 % pronase in DPBS. All manipulations were performed in SOF-Hepes with 10 % FCS.

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Enucleated cytoplasts were exposed to phytohemagglutinin and fused with donor cells via double DC-pulse (1.2 kV/cm), then returned to maturation medium. As nuclear donor, we used a cell clone obtained by homologous direct recombination (HDR)11 that harbors a 106 bp deletion on the left homology arm of exon 3 as well as a puromycin-resistance cassette in both alleles of the SURF1 gene. Embryos were cultured in modified mSOF medium with amino acids and 4 mg/ml BSA, using a modified Well-of-the-Well system. Sows were synchronized with 12 mg/day of altrenogest for 15 days. On day 13, they received 0.15 mg PgF2α, followed by 1000 IU hCG 96 h after the last altrenogest dose.

In vivo hemodynamics

On day 6 of SCNT embryo development (compacted morula to early blastocyst stage), embryos were surgically transferred via mid-ventral laparotomy, five days after standing estrus. Pregnancy was assessed via ultrasound on day 30 and confirmed on day 60 post-transfer. Farrowing was induced with PgF2α on days 114-115 of gestation. For body temperature detection we used a Thermal Imaging Camera (Dongguan Xintai Instrument Co., Ltd, China). SURF1 KO male piglets were treated immediately after birth with sildenafil citrate (n=3 animals with 2.1 mg/kg/day, n=4 animals with 0.5 mg/kg/day).