SS-31

Research-Documented Benefits

• Mitochondrial Targeting — SS-31 (Elamipretide) selectively concentrates in the inner mitochondrial membrane at over 1000-fold relative to cytoplasm, independent of mitochondrial membrane potential.
• Cardiolipin Stabilization — Binds and stabilizes cardiolipin, a critical phospholipid required for electron transport chain complex assembly and efficient ATP production.
• Heart Failure Research — Demonstrated improvements in left ventricular function and reduced cardiac remodeling in preclinical and early clinical heart failure studies.
• Renal Protection — Research shows attenuation of ischemia-reperfusion injury in kidney models, preserving mitochondrial structure and function.
• Skeletal Muscle Function — Studies in aged animals demonstrate improved exercise tolerance and mitochondrial oxidative capacity in skeletal muscle tissue.

Mechanism of Action

SS-31 (D-Arg-Dmt-Lys-Phe-NH2, also known as Elamipretide or Bendavia) is a cell-permeable, mitochondria-targeted tetrapeptide with an alternating aromatic-cationic motif.

Primary Pathways

• Cardiolipin Binding — SS-31 selectively binds cardiolipin, a unique diphosphatidylglycerol lipid found almost exclusively in the inner mitochondrial membrane, where it stabilizes the cristae structure essential for electron transport chain organization.
• Electron Transport Chain Optimization — By stabilizing cardiolipin-dependent supercomplex assembly (Complexes I, III, IV), SS-31 improves electron flow efficiency and reduces electron leak that generates reactive oxygen species.
• ROS Reduction — Does not act as a direct free radical scavenger; instead reduces ROS production at the source by improving mitochondrial coupling efficiency.
• Membrane Potential-Independent Targeting — Unlike most mitochondria-targeted compounds (e.g., TPP+-conjugates), SS-31 concentrates in mitochondria independent of membrane potential, allowing it to function even in damaged or depolarized mitochondria.

SS-31 addresses mitochondrial dysfunction at its structural root—cardiolipin disorganization—rather than attempting to neutralize downstream oxidative damage, representing a fundamentally different therapeutic strategy.

Research Protocol Guidelines

All protocols described are for in vitro and in vivo research purposes only. Not for human use.

Reconstitution

Reconstitute lyophilized SS-31 (Elamipretide) with bacteriostatic water or sterile saline. SS-31 is highly water-soluble due to its cationic residues.

Research Dosing (Published Literature)

• Preclinical (rodent): 1-5 mg/kg/day subcutaneously in heart failure, renal ischemia, and skeletal muscle models
• Clinical trials: 4 mg SC once daily (40 mg/mL) in heart failure and Barth syndrome studies
• In vitro: 1-100 nM in isolated mitochondria preparations for electron transport chain and cardiolipin binding assays
• Acute pretreatment: 3 mg/kg IV 30 minutes prior to ischemia-reperfusion challenge in surgical models

Storage

Store lyophilized form at -20°C. Reconstituted solution at 2-8°C, use within 7 days. SS-31 is relatively stable but the Dmt (dimethyltyrosine) residue can oxidize; minimize air exposure.

Safety & Handling Information

For research use only. Not intended for human or veterinary diagnostic or therapeutic use.

Storage Requirements

• Lyophilized: -20°C, protected from light
• Reconstituted: 2-8°C, use within 7 days
• Dmt residue is oxidation-sensitive; minimize air exposure

Clinical Safety Data

SS-31 (Elamipretide) has been evaluated in Phase I-III clinical trials for heart failure, Barth syndrome, and mitochondrial myopathy. Generally well-tolerated, with injection site reactions as the most common adverse event.

Known Considerations

• Injection site reactions (erythema, pruritus) reported in ~25% of clinical trial participants
• Mitochondrial membrane potential-independent accumulation means SS-31 concentrates even in damaged mitochondria—consider in studies of severe mitochondrial dysfunction
• No significant effects on cardiac electrophysiology (QT interval) in clinical studies
• Renal clearance is the primary elimination route—adjust dose calculations in renal impairment models

Handling

Standard laboratory PPE. Protect reconstituted solutions from light (amber vials preferred). The Dmt residue produces a characteristic UV absorption that can be used for purity verification.

Frequently Asked Questions