SS-31

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Elamipretide boosted mitochondrial respiration in rats with heart failure with preserved ejection fraction, but heart function, stiffness, and tissue damage stayed the same—and in some cases got slightly worse. The findings suggest this drug may not help once this form of heart failure has taken hold.

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In mice and human cells with a rare fatty-acid oxidation disorder, elamipretide improved exercise endurance and mitochondrial energy production without changing cardiolipin levels. The peptide may work by stabilizing enzymes in the energy chain, offering hope for patients whose nerve and eye problems don't respond to current treatments.

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Computer simulations showed that adding cardiolipin and elamipretide to cell membranes increases their capacitance and makes them more resistant to electrical stress that can punch holes in membranes. The work helps explain how mitochondria-targeted peptides may protect membranes in real cells.

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The FDA approved elamipretide in 2025 as the first drug that directly targets the mitochondrial cause of Barth syndrome, a rare genetic disorder affecting the heart and muscles. Short-term trial results were mixed, but patients showed lasting gains during long-term follow-up, and the drug was generally well tolerated.

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Imeglimin reduced stroke-like brain damage in young and middle-aged rats but had no effect in older rats, and it boosted one mitochondrial enzyme while dampening others. The drug's brain benefits appear to fade with age, which matters for treating older diabetic patients.

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Cells taken from carpal tunnel patients showed stronger mitochondria, less cell death, and better antioxidant activity when treated with imeglimin. The results point to a possible new way to address the mitochondrial problems linked to carpal tunnel syndrome.

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A short peptide called CAQK homes to injured brain tissue and, when given soon after traumatic brain injury, shrinks the damaged area, curbs inflammation, and improves function in mice and pigs. With no approved drugs for acute TBI, this could open a new treatment path.

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Mitochondrial drugs like SS-31 look promising for acute kidney injury in animal studies, and a protein called PLSCR3 appears to be key to how SS-31 protects mitochondria. Turning these findings into reliable human treatments still faces hurdles around dosing, delivery, and safety.

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In heart cells exposed to high sugar, imeglimin cut oxidative stress and strengthened cell-to-cell connections more effectively than metformin. The drug may help protect the heart from diabetes-related damage beyond its blood-sugar effects.

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Giving the hormone asprosin before a temporary kidney blood cutoff reduced kidney damage, inflammation, and cell death in mice. The hormone may protect the kidneys when blood flow is restored after surgery or transplant.

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Researchers packaged SS-31 into tiny lipid bubbles called liposomes to improve its delivery and stability, since the peptide alone can be hard to get into cells. The goal was to create a better way to deliver this mitochondria-targeting antioxidant to blood vessel and muscle cells.

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Adding elamipretide to rooster sperm before freezing reduced oxidative damage and improved motility and membrane integrity after thawing, with the best results at 6–9 micromolar. Higher doses were toxic, so the dose matters for poultry breeding programs.

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Brain fog from sepsis is tied to poor energy production in mitochondria, and SS-31 restored mitochondrial function and memory in mice exposed to a sepsis-like insult. Targeting mitochondria may offer a new way to treat or prevent brain complications after severe infection.

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Imeglimin reduced cell death and mitochondrial dysfunction in nerve-support cells exposed to both high and low sugar. The drug may help protect nerves from the oxidative stress that drives diabetic neuropathy.

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High sugar slowed wound healing in retinal cells and triggered scarring and fibrosis, but the antioxidant peptide Epitalon reversed these effects. Epitalon could help slow or treat diabetic eye disease by improving healing and reducing scarring in the retina.

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After severe muscle loss, SS-31 lowered harmful oxidative stress, improved mitochondrial efficiency, and boosted antioxidant capacity in mice, but pairing it with exercise only modestly helped metabolism—not strength. Oxidative stress is one piece of the puzzle; restoring muscle after major injury likely needs multiple approaches.

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Researchers tested whether SS-31 could protect against lung scarring induced by bleomycin in mice. The abstract describes the study aim; full results would clarify whether the peptide reduced fibrosis.

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Recent work shows elamipretide does more than scavenge oxidants—it binds cardiolipin, tunes membrane charge, and helps assemble key mitochondrial proteins. The peptide has improved organ function in animal models of heart, muscle, and eye disease, and clinical trials in Barth syndrome, mitochondrial myopathy, and macular degeneration support its potential.

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SS-31 limited cell death and nerve damage in spinal cord injury models and helped mice recover movement by preserving a key mitochondrial lipid called cardiolipin. The lipid’s breakdown may drive secondary damage after spinal cord injury, making it a promising drug target.

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SS-31 did not reduce tiny brain bleeds in aged, hypertensive mice, but the team built a faster, more accurate imaging tool to count them. The new pipeline will help screen future drugs for vascular dementia, and the results suggest single-drug approaches may not be enough.

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A drug delivery system that releases rapamycin and SS-31 only in inflamed joints cut inflammation and oxidative stress in mouse arthritis models while boosting regulatory immune cells. The approach may offer a safer way to treat rheumatoid arthritis by targeting the joint instead of the whole body.

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Elamipretide reduced frailty and improved heart and muscle function in aging mice without changing their molecular “biological age.” The drug shifted gene activity in a pro-longevity direction, but functional gains and molecular aging may be partly separate.

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Elamipretide homes to mitochondria, binds cardiolipin, and stabilizes energy production while cutting oxidative stress. Animal and human trials support its use in heart failure, neurodegeneration, muscle weakness, and related conditions, with more work needed on long-term safety and broader applications.

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GV1001 blocked the harmful changes in blood vessel cells caused by the cancer drug doxorubicin and prevented artery hardening in mice, likely by protecting mitochondria and reducing inflammation. The peptide could help cancer survivors avoid heart and vessel damage from chemotherapy.

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Abstract too short to summarize.

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A drug that releases SS-31 and an antioxidant activator only in acidic, injured heart tissue restored mitochondrial function and reduced damage after a heart attack–like event in lab models. The approach could offer a targeted way to limit injury when blood flow returns to the heart.

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Blocking the CD74 receptor with DRhQ improved memory and brain energy production in Alzheimer’s mice without noticeably reducing amyloid plaques. The drug may help cognition through inflammation and mitochondrial pathways rather than plaque clearance.

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A heart-derived peptide called CMP reduced heart damage after ischemia-reperfusion in rats by turning on PPARγ and improving mitochondrial energy production. The findings clarify how CMP protects the heart and point to PPARγ as a possible drug target.

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Tiny vesicles loaded with selenium and SS-31, designed to release in inflamed gut tissue, reduced mitochondrial oxidative stress and prevented a form of programmed cell death in inflammatory bowel disease models. The approach could lead to more targeted treatments for Crohn’s and ulcerative colitis.

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Elamipretide given right after loud noise exposure prevented hearing loss and preserved auditory nerve responses in mice. The peptide may protect the inner ear by reducing mitochondrial oxidative damage, offering a potential way to prevent noise-induced hearing loss in people.