Assessing the Efficacy of Mitochondria-Accumulating Self-Assembly Peptides in Pancreatic Cancer: An Animal Study.

Abstract

Although pancreatic cancer presents with one of the most unfavorable prognoses, its treatment options are very limited. Mitochondria-targeting moieties, considered a new and prominent treatment modality, are expected to demonstrate synergistic anticancer effects due to their distinct mechanism compared to conventional chemotherapeutic approaches. This study evaluated the therapeutic potential of mitochondria-accumulating self-assembly peptides, referred to as Mito-FFs, utilizing both in vitro and in vivo pancreatic cancer models. Cellular viability assays revealed a concentration-dependent decrease in the survival of MIA-PACA2 pancreatic cancer cells upon exposure to Mito-FF treatment (p < 0.05). Subsequent in vitro Mito-FF treatments prompted the use of several molecular analyses, including Real-time PCR, Western blot analysis, and MitoSOX staining, which collectively indicated an upsurge in apoptosis, a concurrent reduction in the antioxidant enzyme expression, and an elevation in mitochondrial ROS levels (p < 0.05). In a murine xenograft model of pancreatic cancer, the intravenous administration of Mito-FF yielded a notable reduction in the tumor volume. Moreover, it upregulated the expression of pro-apoptotic markers, such as cleaved PARP and c-caspase 3, while concurrently downregulating the expression of an anti-apoptotic marker, MCL-1, as evidenced by both Western blot analysis and immunohistochemical staining (p < 0.05). It also resulted in the reduced expression of antioxidant enzymes like HO-1, catalase, and SOD2 within excised tumor tissues, as confirmed using Western blot analysis (p < 0.05). Cumulatively, the findings underscore the significant anticancer efficacy of Mito-FF against pancreatic cancer cells, predominantly mediated through the induction of apoptosis, suppression of antioxidant enzyme expression, and enhancement of mitochondrial ROS levels within the tumor microenvironment.