Doxycycline ameliorates autophagy by inhibiting p38 MAPK in cardiac myocytes

Bamboo Leaf Flavonoids Suppress Oxidative Stress-Induced Senescence of HaCaT Cells and UVB-Induced Photoaging of Mice through p38 MAPK and Autophagy Signaling

With the global escalation of the aging process, the research on aging mechanisms and anti-aging strategies has become a hot spot. As the most external organ of the human body, skin can be used as an ideal organ for the study of endogenous and exogenous aging. Bamboo leaf flavonoids (BLF) possess a variety of biological effects such as antioxidant, anti-bacterial, anti-inflammatory, lipid-lowering, anti-radiation, and anti-aging. However, it is still unclear whether they can delay skin aging. This study aimed to analyze the inhibitory effect of BLF on skin aging and explore their molecular mechanisms. We found that 10–40 μg/mL BLF significantly inhibited the senescence of HaCaT cells induced by AAPH, which might be related to their antioxidant and anti-inflammatory abilities. Further mechanism studies showed that mitogen-activated protein kinase (MAPK), especially the p38 MAPK pathway, was the key to BLF to alleviate the senescence of HaCaT cells. In addition, autophagy was also involved in the anti-senescence effect of BLF. The results were also verified in UVB-induced photoaging mice. Therefore, BLF can be used as a potential therapeutic agent to intervene skin aging in vitro and in vivo.

Cardiovascular protective effects of GLP-1:A focus on the MAPK signaling pathway

Cardiovascular and related metabolic diseases are significant global health challenges. Glucagon-like peptide 1 (GLP-1) is a brain-gut peptide secreted by ileal endocrine that is now an established drug target in type 2 diabetes (T2DM). GLP-1 targeting agents have been shown not only to treat T2DM, but also to exert cardiovascular protective effects through regulating multiple signaling pathways. The mitogen-activated protein kinase (MAPK) pathway, a common signal transduction pathway for transmitting extracellular signals to downstream effector molecules, is involved in regulating diverse cell physiological processes, including cell proliferation, differentiation, stress, inflammation, functional synchronization, transformation and apoptosis. The purpose of this review is to highlight the relationship between GLP-1 and cardiovascular disease (CVD), and discuss how GLP-1 exerts cardiovascular protective effects through MAPK signaling pathway. This review also discusses the future challenges in fully characterizing and evaluating the CVD protective effects of GLP-1 receptor agonists (GLP-1RA) at the cellular and molecular level. A better understanding of MAPK signaling pathway that are disregulated in CVD may aid in the design and development of promising GLP-1RA.

Ergosterol peroxide suppresses porcine deltacoronavirus (PDCoV)-induced autophagy to inhibit virus replication via p38 signaling pathway

Porcine deltacoronavirus (PDCoV) is a swine enteropathogenic coronavirus (CoV) that continues to spread globally, placing strain on economic and public health. Currently, the pathogenic mechanism of PDCoV remains largely unclear, and effective strategies to prevent or treat PDCoV infection are still limited. In this study, the interaction between autophagy and PDCoV replication in LLC-PK1 cells was investigated. We demonstrated that PDCoV infection induced a complete autophagy process. Pharmacologically induced autophagy with rapamycin increased the expression of PDCoV N, while pharmacologically inhibited autophagy with wortmannin decreased the expression of PDCoV N, suggesting that PDCoV-induced autophagy facilitates virus replication. Further experiments showed that PDCoV infection activated p38 signaling pathway to trigger autophagy. Besides, ergosterol peroxide (EP) alleviated PDCoV-induced activation of p38 to suppress autophagy, thus exerting its antiviral effects. Finally, we employed a piglet model of PDCoV infection to demonstrate that EP prevented PDCoV infection by suppressing PDCoV-induced autophagy via p38 signaling pathway in vivo. Collectively, these findings accelerate the understanding of the pathogenesis of PDCoV infection and provide new insights for the development of EP as an effective therapeutic strategy for PDCoV.