Abstract The SS-31 (Elamipretide) 50mg peptide pen contains a high-concentration solution of the Szeto-Schiller-31 tetrapeptide, a pioneering compound in the field of mitochondrial medicine. Unlike antioxidants that scavenge reactive oxygen species (ROS) after they are formed, SS-31 is a cell-permeable peptide that selectively targets the inner mitochondrial membrane (IMM). By binding specifically to cardiolipin, a unique phospholipid essential for mitochondrial cristae architecture, SS-31 optimises the electron transport chain (ETC) efficiency and prevents the leakage of electrons that leads to oxidative stress. This 50mg formulation is specifically engineered for chronic administration protocols in models of age-related mitochondrial dysfunction, cardiac ischaemia, and neurodegenerative decline, where sustained bioenergetic support is critical for reversing cellular senescence.

Mechanism and Research Interest

Primary Biological Pathway: Cardiolipin Stabilisation

The primary mechanism of SS-31 is its high-affinity interaction with cardiolipin. Cardiolipin is strictly localised to the inner mitochondrial membrane and is vital for the formation of “supercomplexes” in the Electron Transport Chain.

In dysfunctional or ageing mitochondria, cardiolipin becomes oxidised (peroxidised), leading to cristae collapse and inefficient respiration. SS-31 penetrates the IMM and binds to cardiolipin, structurally stabilising it. This interaction restores the curvature of the cristae and facilitates the efficient transfer of electrons between Complex III and Complex IV (Cytochrome c oxidase), thereby restoring ATP production rates to youthful levels.

Secondary Research Finding: Prevention of ROS-Induced Injury

Unlike traditional scavengers, SS-31 functions upstream of oxidative damage. By optimising electron flux through the ETC, it minimises the “electron leak” that generates superoxide radicals. Research utilising the 50mg format focuses on this preventative capacity, particularly in models of Ischaemia-Reperfusion (I/R) injury. Data suggests that pre-treatment with SS-31 prevents the opening of the mitochondrial permeability transition pore (mPTP) during reperfusion, significantly reducing infarct size in myocardial and renal tissue studies.

Tertiary Research Finding: Anti-Apoptotic Signalling

SS-31 has profound implications for cell survival pathways. By preventing the peroxidation of cardiolipin, the peptide inhibits the detachment of Cytochrome c from the mitochondrial membrane. Since cytosolic Cytochrome c is the trigger for the caspase cascade (apoptosis), SS-31 effectively raises the apoptotic threshold of the cell. Researchers use the 50mg pen to study the preservation of post-mitotic tissues, such as cardiomyocytes and neurons, under conditions of metabolic stress.

Long-term Genomic and Safety Observations

A unique feature of SS-31 is its specificity for dysfunctional mitochondria; it appears to have little effect on healthy organelles. Current genomic studies are analysing the expression of nuclear genes encoding mitochondrial proteins (PGC-1$\alpha$, TFAM) following chronic 50mg administration. The goal is to determine if bioenergetic restoration leads to a retrograde signalling event that normalises the transcriptional profile of ageing tissues, effectively “rejuvenating” the gene expression landscape.

Product Specifications

• Purity: Validated at >98+% via High-Performance Liquid Chromatography (HPLC). The synthesis includes the specific D-amino acids (D-Arg and Dmt) required for the peptide’s resistance to enzymatic degradation.

• Appearance: The 3ml pen contains a clear, colourless, sterile liquid.

• Precision: The pen delivery system ensures accurate volumetric dosing, which is essential for establishing pharmacokinetics in long-term bioenergetic studies.

• Storage: The product must be stored at 2 degree.

Storage and Shipping Guidelines

Refrigeration and Shelf Life

The SS-31 50mg Pen is a robust peptide but requires refrigeration ($2^{\circ}C$ to $8^{\circ}C$) to maintain its tertiary conformation. The shelf life is 12 months sealed. Once the pen is accessed, the bacteriostatic environment ensures stability for 28 days. As mitochondrial efficacy is highly dose-dependent, researchers should ensure the solution is used within this timeframe to avoid dosing variability.

Shipping Stability

This product is shipped with medical-grade thermal packaging. SS-31 is stable for up to 72 hours at ambient UK temperatures. However, to ensure the peptide arrives ready for immediate mitochondrial uptake assays, we recommend expedited shipping.

Freezing Warning

Do not freeze. Freezing can disrupt the solution matrix and potentially precipitate the peptide. While SS-31 is water-soluble, the formation of ice crystals can cause micro-aggregation. A frozen pen should be discarded to ensure experimental validity.

Why Choose the Peptide Pro 3ml Pen Format?

The SS-31 50mg Pen is the standard for Chronic Bioenergetic Research.

Mitochondrial turnover and repair is a slow physiological process. Short-term studies often fail to capture the full restorative potential of cardiolipin stabilisation. The 50mg concentration allows for extended dosing protocols (e.g., 4-8 weeks) in rodent models without the need for constant restocking or batch changing.

Our pre-reconstituted pen ensures that the molarity remains constant throughout the longitudinal study, eliminating the variability associated with daily manual mixing.

For researchers investigating related metabolic and repair pathways, we recommend examining:

• MOTS-c 10mg: https://www.peptidepro.co.uk/product/mots-c-10mg/ (For mitochondrial-derived peptide research on metabolic regulation).

• Humanin 10mg: https://www.peptidepro.co.uk/product/humanin-10mg/ (For comparative cytoprotection studies).

Disclaimer

This product is strictly for Research Use Only (RUO). It is not intended for human consumption, injection, therapeutic use (e.g., for Barth syndrome or heart failure), or diagnostic procedures. The information provided is for educational and scientific reference only. Purchase is restricted to verified research institutions and qualified individuals. Any evidence of intended misuse for human application will result in immediate order cancellation and blacklisting, in compliance with UK research chemical regulations.