raw 264.7 murine macrophages

Flunixin meglumine (Banamine) is an effective inhibitor of the enzyme cyclooxygenase with anti-inflammatory and antipyretic activity.

YHS-12, a ionizable cationic lipid (pKa = 6.506), has been utilized both in vitro and in vivo for delivering siRNA and mRNA via lipid nanoparticles (LNPs). These LNPs comprise YHS-12 and a targeting peptide CRVLRSGSC aimed at macrophages, encapsulating chimeric antigen receptor mRNA targeted at methicillin-resistant Staphylococcus aureus (MRSA) and siRNA against caspase-11. The LNPs have enhanced the phagocytic efficiency against MRSA in RAW 264.7 macrophages and primary murine bone marrow-derived macrophages (BMDMs). Administered intravenously, these LNPs have reduced bacterial load in the bloodstream and increased survival rates in a sepsis model in cyclophosphamide-induced immunosuppressed mice.

Pap12-6, an antibacterial peptide originating from the first twelve N-terminal amino acids of papiliocin found in P. xuthus larvae, exhibits activity against a range of eight Gram-negative bacteria (e.g., E. coli, P. aeruginosa, S. syphimurium with MIC50s=4-8 µM) and Gram-positive bacteria (e.g., S. aureus, methicillin-resistant S. aureus 3126, B. subtilis, and S. epidermidis with MIC50s=4-8 µM), without compromising the viability of human erythrocytes, mouse RAW 264.7 macrophages, human HaCaT keratinocytes, or human HEK293 kidney cells at 25 µM. It causes membrane depolarization in E. coli at 4 and 8 µM and, upon preincubation at 10 µM, decreases nitrite (NO2-), Tnf-α, and Il-6 secretion in LPS-stimulated RAW 264.7 macrophages. In a murine model, Pap12-6 enhances survival rates and diminishes colony forming units (CFUs) in several organs upon E. coli infection at 10 mg/kg and 1 mg/kg doses, respectively. Additionally, at a 1 mg/kg dose, it lowers serum aspartate aminotransferase (AST) and alanine transaminase (ALT) levels, as well as blood urea nitrogen levels in E. coli-induced sepsis, indicating its therapeutic potential for bacterial infections without affecting host cell viability.

EP4 antagonist 14 is a prostaglandin E2 receptor subtype EP4 antagonist, demonstrating an IC50 of 1.1 nM in a HEK293 human receptor reporter assay and blocking β-arrestin recruitment due to PGE2 with an IC50 of 0.9 nM. At 10 µM, it reduces PGE2-stimulated mRNA levels of Il-4, macrophage mannose receptor 1 (Mrc1), chitinase-like protein 3 (Chil3), chemokine (C-X-C) motif ligand 1 (Cxcl1), triggering receptor expressed on myeloid cells 2 (Trem2), and arginase-1 (Arg1) in RAW 264.7 macrophages. When used at 30 mg/kg per day alongside anti-PD-1 antibodies, it curbs tumor growth and enhances CD8+ T cell infiltration in tumors using a CT26 murine colon cancer model.

Villosin exhibits potent cytotoxic activity , it may be used as a potential lead molecule for antitumor therapeutic development. Villosin shows inhibitory effects against nitric oxide production in LPS and IFN-γ-induced RAW 264.7 murine macrophages with I