CPNE3 interaction with RACK1 protects against myocardial ischemia/reperfusion injury

Bawei Chenxiang Powder Protects Cardiomyocytes From Myocardial Ischemia/Reperfusion Injury via the PI3K-AKT Pathway

Ischemia-reperfusion damage to cardiomyocytes is one of the main directions of cardiovascular disease research, and Bawei Chenxiang powder (BWCX) is a traditional ethnomedicinal compound preparation mainly used in the treatment of cardiovascular diseases. On the basis of serum pharmacology, the present study aimed to explore the potential mechanism of BWCX against myocardial ischemia-reperfusion damage to cardiomyocytes. We prepared BWCX-serum containing. Using serum pharmacology and bioinformatics approaches, we explored its protective effects on H9C2 cells in a hypoxia/reoxygenation (H/R) model. Additionally, we investigated the underlying mechanisms. BWCX-containing serum can increase the survival rate of H9C2 cells and reduce oxidative stress levels in an H/R model. Specifically, it decreases the release of malondialdehyde (MDA), lactate dehydrogenase (LDH), creatine kinase (CK), and reactive oxygen species (ROS), while increasing the levels of catalase (CAT), superoxide dismutase (SOD), glutathione peroxidase (GSH-PX), and Complex I. Additionally, it downregulates the expression of NADH dehydrogenase (ubiquinone) 1 alpha sub-Complex 10 (NDUFA-10), thioredoxin (Trx), heme oxygenase 1 (HO-1), and kelch-like ECH-associated protein 1 (Keap1), and it upregulates the expression of nuclear factor erythroid 2-related factor 2 (Nrf2). These effects are potentially mediated through the PI3K-AKT pathway. In the present study, we found that BWCX powder exhibited significant ameliorative and reparative effects on H/R-induced cardiomyocyte injury by alleviating the level of oxidative stress during H/R and acting on the PI3K-AKT pathway.

YAP1-CPNE3 positive feedback pathway promotes gastric cancer cell progression

Hippo-Yes-associated protein 1 (YAP1) plays an important role in gastric cancer (GC) progression; however, its regulatory network remains unclear. In this study, we identified Copine III (CPNE3) was identified as a novel direct target gene regulated by the YAP1/TEADs transcription factor complex. The downregulation of CPNE3 inhibited proliferation and invasion, and increased the chemosensitivity of GC cells, whereas the overexpression of CPNE3 had the opposite biological effects. Mechanistically, CPNE3 binds to the YAP1 protein in the cytoplasm, inhibiting YAP1 ubiquitination and degradation mediated by the E3 ubiquitination ligase β-transducin repeat-containing protein (β-TRCP). Thereby activating the transcription of YAP1 downstream target genes, which creates a positive feedback cycle to facilitate GC progression. Immunohistochemical analysis demonstrated significant upregulation of CPNE3 in GC tissues. Survival and Cox regression analyses indicated that high CPNE3 expression was an independent prognostic marker for GC. This study elucidated the pivotal involvement of an aberrantly activated CPNE3/YAP1 positive feedback loop in the malignant progression of GC, thereby uncovering novel prognostic factors and therapeutic targets in GC.