Mitochondrial Peptides MOTS-c and SS-31: New Frontiers in Cardiac Repair

Research brief

Mitochondrial peptides like MOTS-c and SS-31 show promise in promoting cardiac repair and mitigating brain injury [PMID: 42633281] [PMID: 42600764]. Further validation is needed to confirm MOTS-c's therapeutic potential in sepsis-induced cardiomyopathy [PMID: 42633878].

Key findings

• MOTS-c hydrogel improves cardiac repair post-MI by enhancing macrophage metabolism [PMID: 42633281]. • SS-31 partially mitigates trauma-induced brain injury by targeting mitochondrial oxidative stress [PMID: 42600764]. • MOTS-c's role in sepsis-induced cardiomyopathy needs further SICM-specific validation [PMID: 42633878]. • Humanin's efficacy in cardiac rehabilitation and risk stratification is highlighted in CHF settings [PMID: 42736132].

Detailed research context

Introduction

Mitochondrial-derived peptides, particularly MOTS-c and SS-31, have garnered considerable interest for their therapeutic potential in various diseases, including myocardial infarction (MI) and traumatic brain injury (TBI). These peptides offer novel mechanisms of action focused on mitochondrial protection and metabolic regulation.

MOTS-c in Cardiac Repair

MOTS-c, a mitochondrial-derived peptide, has been investigated for its role in enhancing cardiac repair after myocardial infarction (MI). In a novel study, MOTS-c was incorporated into a hydrogel delivery system (MQ gel @Mito). This formulation not only improved the retention and function of donor mitochondria but also modulated macrophage metabolism through an AMPK-dependent mechanism [PMID: 42633281]. The hydrogel showed efficacy in reducing oxidative stress and M1 macrophage polarization, ultimately enhancing functional recovery in a rat model of MI.

SS-31 and Brain Injury

In the realm of traumatic brain injury (TBI), SS-31, another mitochondrial-targeted peptide, has demonstrated potential in mitigating the evolution of secondary injuries after brain trauma. Specifically, SS-31 exhibited partial efficacy in reducing inflammatory and oxidative stress-related damage when mice were exposed to controlled cortical impact followed by artificial seawater immersion. These findings highlight SS-31's ability to address mitochondrial oxidative stress, signifying a modifiable target for therapeutic interventions in TBI settings [PMID: 42600764].

MOTS-c in Sepsis-Induced Cardiomyopathy

Sepsis-induced cardiomyopathy (SICM) presents a significant challenge, largely due to mitochondrial dysfunction. MOTS-c has demonstrated some potential in influencing SICM-related pathologies through mechanisms involving stress-responsive signaling and energy metabolism modulation. However, current evidence remains inadequate as there is limited SICM-specific data to fully understand MOTS-c's applicability in this context. A diligent assessment of its direct effects and mechanisms in SICM is necessary to establish therapeutic relevance [PMID: 42633878].

Humanin in Heart Failure

Humanin, another mitochondrial-derived peptide, has been implicated in cardiac rehabilitation scenarios, particularly in patients experiencing acute exacerbations of chronic heart failure. Its utility, particularly the Humanin/CRP ratio, has been tested as a prognostic risk factor for clinical outcomes. While the initial findings advocate for its potential role in risk stratification [PMID: 42736132], wider studies encompassing diverse patient populations remain pending to solidify these observations.

Conclusion

Current research underscores the potential of mitochondrial peptides like MOTS-c and SS-31 in advancing therapeutic strategies for cardiac and neurological injuries. Despite promising preclinical outcomes, translation into clinical practice warrants extensive SICM-specific evaluation and validation in broader, diverse populations. This presents a significant avenue for future research aimed at unraveling the mechanistic pathways and optimizing peptide-based therapeutic approaches.

Source method

This research briefing is based on the verified PubMed records linked in the References & Citations section below.