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Background Resolvin D1 could reduce the inflammatory, catabolic response of OA chondrocyte, and promote the repair of various tissues.Our goal was to explore whether RvD1 could inhibit NLRP3/caspase-1 signaling pathway, slow down the occurrence of pyroptosis of OA chondrocytes, and then promote the proliferation of OA chondrocytes and repair of articular cartilage.Methods Animal care and use protocols comply with the National Institutes of Health Guide for the Care and Use of Laboratory Animals.After the rat osteoarthritis model was established, RvD1 was injected and a control group trial was set up, Joint specimens were then collected.The micro-CT system was used to determine the acquisition of a 3D model of the rat knee joint. Chondrocytes were stained with toluidine blue, Then the cover slip was examined under a light microscope. EDU was used to detect the proliferation of chondrocytes.Western Blot,RT-qPCR and Immunofluorescence was used to detect markers in experiments.Results Compared with the control group, RvD1 can promote OA chondrocytes multiplication and inhibit chondrocytes pyrosis by regulating the cell cycle.Belnacasan is a specific inhibitor of caspase-1, Treatment of OA chondrocytes with Belnacasan and RvD1 showed that Belnacasan could specifically inhibit the conduction of pyroptosis pathway induced by caspase-1, and the synergistic inhibitory effect with RvD1 was more significant.Conclusion RvD1 promotes the proliferation of OA chondrocytes by inhibiting the expression of caspase-1 to regulate NLRP3/caspase-1 signaling − 8 pathway. At the same time, RvD1 promoted the repair of articular cartilage and retarded the progression of OA in rats.

Constructing hybrid energetic materials (HEMs) consisting of nanothermites and organic high explosives is an efficient strategy to regulate the reactivity of energetic composites. To investigate the role of interfacial microstructures in determining the reactivity of HEMs, we employ electrospray, one ramification of electrohydrodynamic atomization, to assemble Al/CuO and hexanitrohexaazaisowurtzitane (CL-20) into composites with various morphologies from different solvent systems. The morphology and compositional information of the assembled clay-like or granular HEMs, which are obtained from ketone, ester, or mixtures of alcohol and ether, are confirmed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The phase transition of CL-20 due to the fast evaporation of charged droplets and insufficient time for recrystallization is studied by Fourier transform infrared spectroscopy (FTIR). Thermogravimetric-differential scanning calorimetry (TG-DSC) is applied to investigate the thermodynamic behaviors and synergistic effect of the nanothermite and high explosive. Enhancements in combustion performance and pressurization characteristics of the as-sprayed HEMs have been observed through open burn tests and pressure cell tests. Granular HEMs show high gas generation and high pressurization rate, while nitrocellulose (NC) fibers existing in the clay-like HEMs would weaken the reactivity to a certain extent. HEMs obtained from the mixture of n-propanol and diethyl ether, in which nano-CL-20 exists as independent particles rather than a matrix, exhibit high gas generation but low pressurization rate. The results indicate that the energy releasing performance of the prepared HEMs can be readily regulated by constructing various interfacial microstructures to satisfy the broad requirements of energy sources.