Rhein-13C4 is intended for use as an internal standard for the quantification of rhein by GC- or LC-MS. Rhein is an anti-inflammatory anthraquinone found in rhubarb and is the bioactive derivative of its prodrug diacerein . At 10 μM, rhein inhibits IL-1β signaling, suppressing signaling through NF-κB, and reduces the expression of the matrix metalloproteases MMP-1 and MMP-13.1 It inhibits IKKβ (IC50 = 11.8 μM), decreasing iNOS and IL-6 expression in LPS-stimulated macrophages but paradoxically increasing TNF-α, IL-1β, and HMBG1 expression.2 Rhein shows efficacy against pancreatic fibrosis, chronic pancreatitis, and hyperglycemia-induced pancreatic β-cell apoptosis.3,4 It also inhibits angiogenesis of breast cancer cells under normoxic and hypoxic conditions.5
Funalenone is a phenalenone originally isolated from A. niger. It inhibits HIV-1 integrase (IC50 = 10 μM) and HIV-1 replication in human peripheral blood cells transformed by murine leukemia virus (HPB-M(a); IC50 = 1.7 μM) but is less cytotoxic to mammalian HPB-M(a) cells (IC50 = 87 μM). Funalenone selectively inhibits matrix metalloproteinase-1 (MMP-1; IC50 = 170 μM) over MMP-2 and MMP-9, which it inhibits by 18.3 and 38.2%, respectively, when used at a concentration of 400 μM. It also inhibits the bacterial cell wall synthesis enzymes MraY and MurG (IC50s = 25.5 μM in a membrane plate assay) and inhibits growth of S. aureus with a MIC value of 64 μg mL.
MMPI-1154 is a highly promising imidazole-carboxylic acid (ICA) MMP-2 inhibitor (IC 50 = 6.6 μM) with excellent cardio-cytoprotective properties. It is specifically designed for the study of acute myocardial infarction. Additionally, MMPI-1154 exhibits significant inhibitory effects on MMP-13, MMP-1, and MMP-9 activities with IC 50 values of 1.8 μM, 10 μM, and 13 μM, respectively.
AZD1236 is a potent and reversible inhibitor of human MMP-9 and MMP-12 (IC50 = 4.5 and 6.1nM, respectively), with >10-fold selectivity to MMP-2 and MMP-13 and >350-fold selectivity to other members of the enzyme family. AZD1236 activity is approximately 20 to 50-fold lower at the rat, mouse, and guinea pig orthologues. In acute models of lung injury, AZD1236 inhibited the haemorrhage and inflammation induced by instillation of human MMP-12 into rat lungs by ~80% at 0.81mg kg, and also abolished macrophage infiltration into BAL fluid induced by tobacco smoke inhalation in the mouse.
GHK-Cu acetate, a complex of the tripeptide Gly-His-Lys and a copper(II) ion, exhibits wound healing and anti-inflammatory properties. It enhances fibroblast proliferation, collagen production, and the release of pro-matrix metalloproteinase-2 (MMP-2) and glycosaminoglycans (GAGs), while also increasing decorin expression in rat wound tissue. Furthermore, at a concentration of 10 µM, it reduces levels of reactive oxygen species (ROS), interleukin-6 (IL-6), and tumor necrosis factor-alpha (TNF-α) in LPS-stimulated RAW 264.7 cells. Additionally, GHK-Cu at 10 µg g mitigates LPS-induced reductions in lung superoxide dismutase (SOD) activity and glutathione (GSH) levels, decreases the accumulation of cells and total protein in bronchoalveolar lavage fluid (BALF), and thus, attenuates acute lung injury in mice.