SS-31 Restores Mitochondrial Function in Smoke-Damaged Oral Cells

Cigarette smoke is a major risk factor for various oral diseases, including periodontitis and oral cancer, primarily by inducing oxidative stress and damaging cellular components like mitochondria. This mitochondrial damage leads to impaired cellular function and can contribute to disease progression. Current treatments often focus on symptom management, but there's a critical need for therapies that address the underlying cellular damage. This study investigates whether SS-31 can protect oral epithelial cells from cigarette smoke-induced damage by restoring mitochondrial function and reducing oxidative stress.

The study demonstrated that SS-31 treatment significantly mitigated the detrimental effects of cigarette smoke extract on oral epithelial cells. Specifically, SS-31 led to a marked reduction in reactive oxygen species (ROS) levels, indicating a substantial decrease in oxidative stress. Furthermore, mitochondrial membrane potential, a key indicator of mitochondrial health, was significantly restored, showing a dramatic improvement compared to untreated damaged cells. SS-31 treatment robustly activated PINK1-mediated mitophagy, leading to the efficient clearance of damaged mitochondria and a significant recovery of overall mitochondrial function. This activation of mitophagy was crucial, as inhibiting PINK1 activity abolished the protective effects of SS-31, confirming the pathway's central role. Compared to control cells exposed to smoke but not treated with SS-31, treated cells exhibited superior cellular viability and reduced apoptotic markers.