SS-31 10 mg

Overview

SS 31 is a synthetic mitochondria targeted peptide that associates with cardiolipin rich domains in the inner mitochondrial membrane.
It is widely used in preclinical models to study electron transport chain efficiency mitochondrial structure oxidative stress and muscle physiology during aging and disuse.
The information below summarises how SS 31 has been applied as a tool compound in the scientific literature. All findings are model specific and do not constitute safety or efficacy claims for any clinical use.

1. Mitochondrial bioenergetics and electron transport efficiency

A central focus of SS 31 research is its impact on mitochondrial oxidative phosphorylation. Preclinical studies report that SS 31 binding to cardiolipin enriched inner membranes can promote curvature and support assembly of respiratory supercomplexes in experimental systems. In aged skeletal muscle models SS 31 has been associated with rapid improvements in indices of mitochondrial function including oxidative phosphorylation rates P over O coupling and ATP synthesis capacity.
These changes occur on short time scales that argue for direct modulation of electron transfer efficiency rather than turnover of damaged mitochondrial components.

Researchers use SS 31 to probe how cardiolipin organization and its interaction with cytochrome c influence electron leak reactive oxygen species generation and coupling between oxygen consumption and ATP production.

2. Mitochondrial structure and cristae remodeling

SS 31 has been studied extensively in relation to inner mitochondrial membrane and cristae architecture. Electron microscopy data in aged animal models show age related disruption of cristae structure that has been examined before and after SS 31 exposure. In several reports treatment with SS 31 in older mice has been associated with more regular cristae morphology in cardiac and retinal pigment epithelium mitochondria compared with untreated age matched controls. These structural observations are linked to functional measurements of improved mitochondrial coupling and ATP production in the same models. This work positions SS 31 as a tool to explore how inner membrane lipid microdomains and cristae geometry support electron transport and bioenergetic capacity across tissues.

3. Skeletal muscle aging and endurance models

Skeletal muscle aging provides a major use case for SS 31 research. Older mice show declines in resting and maximal mitochondrial ATP production reduced P over O coupling and altered energy charge along with increased oxidative damage markers. In these models a single SS 31 treatment has been reported to restore mitochondrial energetics toward levels seen in much younger animals within a short time frame. Improved mitochondrial function has been associated with better fatigue resistance at the muscle level and increased whole body endurance in treadmill protocols after repeated dosing. Investigators monitor glutathione redox status mitochondrial hydrogen peroxide emission and markers of oxidative damage to link changes in redox environment with functional recovery of muscle energetics.

4. Disuse atrophy and immobilization research

SS 31 has also been tested in models of disuse induced muscle atrophy including hindlimb suspension and limb casting.
These models show loss of mitochondria mitochondrial swelling increased mitochondrial reactive oxygen species generation and impaired respiration along with activation of multiple proteolytic pathways. Studies report that SS 31 administration can prevent disuse associated declines in state 3 respiration and limit increases in mitochondrial hydrogen peroxide output. These effects have been linked to reduced activation of proteolytic systems including calpains caspase 3 proteasome activity and autophagy markers in immobilized muscles. SS 31 treated animals in these models show attenuation of muscle atrophy and preservation of contractile properties which makes the compound a valuable probe for studying mitochondrial oxidative stress as an upstream signal for muscle protein breakdown.

5. Diaphragm function sepsis and mechanical ventilation models

Another intensive research area involves diaphragm weakness associated with sepsis and mechanical ventilation. In rodent models prolonged mechanical ventilation leads to diaphragmatic atrophy contractile dysfunction elevated mitochondrial state 4 respiration increased mitochondrial hydrogen peroxide release and oxidative damage to proteins and lipids. Experimental work indicates that SS 31 administration during mechanical ventilation can prevent many of these changes preserving force generation endurance and mitochondrial function in the diaphragm. Similar protective patterns have been observed in sepsis induced diaphragm dysfunction models where mitochondrial oxidative stress appears to be a key upstream trigger for protease activation and muscle loss. These findings are used to explore how targeting mitochondrial oxidative stress might influence ventilator induced diaphragm weakness and failure to wean syndromes in translational research settings.

6. Redox regulation and cardiolipin centered mechanisms

Mechanistic studies suggest that SS 31 may exert its effects in part through direct interaction with cardiolipin and modulation of the cardiolipin cytochrome c complex.
By optimizing the local heme environment SS 31 is proposed to support more efficient electron transfer and reduce electron leak in preclinical models. Research has also documented rapid shifts in glutathione redox status after SS 31 exposure including increases in free glutathione consistent with release of glutathione from protein adducts in aged muscle. These changes are accompanied by reduced mitochondrial reactive oxygen species emission providing a redox framework for the observed improvements in bioenergetics and muscle performance.

Typical research applications

Across the literature SS 31 is commonly used in mitochondrial bioenergetics and oxidative phosphorylation studies cristae architecture and inner membrane structural research
skeletal muscle aging and endurance models disuse and immobilization induced muscle atrophy models diaphragm function studies in sepsis and mechanical ventilation
redox signaling and cardiolipin centered mechanistic work. In all these settings SS 31 serves as a mitochondria targeted tool compound to dissect links between structure electron transport redox balance and cell function.

Important research disclaimer

All findings summarised here come from controlled in vitro experiments ex vivo preparations animal models and early phase clinical investigations. They are presented solely to inform qualified researchers about how SS 31 has been used to study mitochondrial and muscle biology. These observations do not demonstrate or imply that SS 31 is safe or effective for any human or veterinary indication. They are not dosing instructions medical advice or guidance for treatment of aging muscle weakness sepsis ventilator associated complications or any other condition. The SS 31 product offered is intended strictly for laboratory research applications.
It is not for human or veterinary use and must not be used for diagnosis treatment cure prevention or mitigation of any disease or condition.