Cell-penetrating peptides (CPPs) are promising molecules as drug carriers. However, because their uptake mainly involves endocytic mechanisms, endosomal trapping of the carrier (and drug) remains a high barrier for biomedical applications. The viral fusion mimic GALA, a pH-triggered CPP, takes advantage of the decreasing pH during endosome maturation to selectively attack endosomal membranes. Below pH 6, the sequence folds into a helix and can disrupt membranes. In this study, we show that the lipid bilayer radius-of-curvature has a negligible effect on GALA-induced leakage kinetics and that GALA remains pH responsive after inserting into a lipid membrane. The peptide can be reversibly "switched" between its inactive and active states after incorporation into the hydrophobic environment of lipid membranes, even after substantially interacting with lipid chains. This ability makes GALA-based delivery a potentially safe and efficient strategy for endosomal escape.
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http://dx.doi.org/10.1021/jacs.5b06720 | DOI Listing |
Clin Transl Oncol
January 2025
Department of General Surgery, Guangzhou Digestive Disease Center, Guangzhou First People's Hospital, Guangzhou Medical University, Guangzhou, 510013, Guangdong, China.
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Department of Genetics & Biotechnology, Graduate School of Biotechnology, College of Life Sciences, Kyung Hee University, Youngin, 17104, Republic of Korea.
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View Article and Find Full Text PDFJ Am Chem Soc
January 2025
Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
Hydrogen spillover is an important process in catalytic hydrogenation reactions, facilitating H activation and modulating surface chemistry of reducible oxide catalysts. This study focuses on the unveiling of platinum-induced hydrogen spillover on monoclinic tungsten trioxide (γ-WO), employing ambient pressure X-ray photoelectron spectroscopy, density functional theory calculations and microkinetic modeling to investigate the dynamic evolution of surface states at varied temperatures. At room temperature, hydrogen spillover results in the formation of W and hydrogen intermediates (hydroxyl species and adsorbed water), facilitated by Pt metal clusters.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Chinese Academy of Sciences Dalian Institute of Chemical Physics, State Key Laboratory of Catalysis, 457 Zhongshan Road, 116023, Dalian, CHINA.
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View Article and Find Full Text PDFFASEB J
January 2025
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Sepsis-induced acute lung injury (ALI) is a common acute and severe reason of death in the intensive care unit. Although the pathogenesis is complicated and multifactorial, elevated inflammation and oxidative stress are considered as fundamental mechanisms for the progression of ALI. Anemonin is a natural compound with diverse biological properties including anti-inflammatory and anti-oxidative effects.
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