Redaporfin, also known as F-2BMet or LUZ-11, is a photosensitizer for Photodynamic Therapy (PDT) of cancer. Redaporfin showed a high efficacy in the treatment of male BALB/c mice with subcutaneously implanted colon (CT26) tumours. Vascular-PDT with 1.5 mg
PtdIns-(3,4,5)-P3 (PIP3) serves as an anchor for the binding of signal transduction proteins bearing pleckstrin homology (PH) domains such as phosphatidylinositol 3-kinase (PI3K) or PTEN. Protein binding to PIP3 is important for cytoskeletal rearrangement and membrane trafficking and initiates an intricate signaling cascade that has been implicated in cancer. 3,5-dimethyl PIT-1 is a dimethyl analog of PIT-1, the selective inhibitor of PIP3/Akt PH domain binding, that is designed for more favorable solubility in vivo. 3,5-dimethyl PIT-1 inhibits PI3K/Akt signaling (IC50 = 27 μM), suppressing PI3K-PDK1-Akt-dependent phosphorylation, which has been shown to reduce cell viability and induce apoptosis in PTEN-deficient U87MG glioblastoma cells (IC50 = 36 μM). 4T1 breast cancer growth is significantly attenuated in BALB/c mice with a dose of 1 mg/kg of 3,5-dimethyl PIT-1 per day.
Benpyrine is a highly specific and orally active TNF-α inhibitor with a KD value of 82.1 μM. Benpyrine tightly binds to TNF-α and blocks its interaction with TNFR1, with an IC50 value of 0.109 μM. Benpyrine has the potential for TNF-α mediated inflammatory and autoimmune disease research[1].
Benpyrine (5-20 μM; 14 hours; RAW264.7 cells) pretreatment results in a dose-dependent decrease in the phosphorylation of IκBα in RAW264.7 cells (stimulated with 10 ng/mL TNF-α or 1 μg/mL LPS). Benpyrine abolishes the TNF-α-induced nuclear translocation of NF-κB/p65 in RAW264.7 cells[1].Benpyrine only blocks cell death induced by TNF-αWT and Y119A, and increases the cell survival rate up to 80%. Benpyrine does not obviously affect L57A- and Y59L-induced cytotoxicity in L929 cells[1].
Benpyrine (25-50 mg/kg; oral gavage; daily; for 2 weeks; Balb/c mice) treatment significantly relieves the symptoms of collagen-induced arthritis. Benpyrine dose-dependently decreases the levels of proinflammatory cytokines, such as IFN-γ, IL-1β and IL-6, and increases the concentration of the anti-inflammatory cytokine IL-10[1].Endotoxemia murine model shows that Benpyrine (25 mg/kg) could attenuate TNF-α-induced inflammation, thereby reducing liver and lung injury[1].
[1]. Weiguang Sun, et al. Discovery of an Orally Active Small Molecule TNF-α Inhibitor. J Med Chem. 2020 Jul 15.
Reveromycin A is the major component of a complex of spiroketal antibiotics isolated from Streptomyces sp. It inhibits the mitogenic activity of epidermal growth factor in Balb/MK cells (IC50 = 0.7 μg/ml), displays antiproliferative activity against human KB and K562 tumor cell lines (IC50s = 1.9 and 1.6 μg/ml, respectively), and demonstrates antifungal activity against C. albicans (MIC = 2 μg/ml at pH 3). Reveromycin A also has been shown to inhibit bone resorption by inducing apoptosis in osteoclasts with an IC50 value of 0.7 μM.
Reveromycin D is a bacterial metabolite originally isolated from Streptomyces. It inhibits EGF-induced mitogenic activity in Balb/MK cells and has pH-dependent antifungal activity against C. albicans (MICs = 2 and >500 μg/ml at pH 3 and 7.4, respectively). Reveromycin D also inhibits proliferation of KB and K562 cells (IC50s = 1.6 and 1.3 μg/ml, respectively).
Reveromycin B is a spiroketal bacterial metabolite originally isolated from Streptomyces. It inhibits EGF-induced mitogenic activity in Balb/MK cells (IC50 = 6 μg/ml) and exhibits pH-dependent antifungal activity against C. albicans (MICs = 15.6 and >500 μg/ml at pH 3.0 and 7.4, respectively). Unlike reveromycin A and reveromycin C , reveromycin B does not inhibit proliferation of KB and K562 cells.
Purfalcamine is an orally active, selective Plasmodium falciparum calcium-dependent protein kinase 1 (PfCDPK1) inhibitor with an IC50 of 17 nM and an EC50 of 230 nM. Purfalcamine has antimalarial activity and causes malaria parasites developmental arrest at the schizont stage[1][2].
Purfalcamine has low activity against Toxoplasma gondii calcium-dependent protein kinase 3 (TgCDPK3)[1]. Purfalcamine (225, 450 nM) has no effect on the parasitemia in the first 32 hours. After about 40 hours, parasite level remains stable and then begins dropping[1]. Purfalcamine inhibits proliferation with EC50s of 171-259 nM for P. falciparum strains (3D7, Dd2, FCB, HB3 and W2), which indicates effectiveness against drug-resistant parasites[1]. Given that the EC50 value for P. falciparum (3D7) is 230 nM, Purfalcamine shows a therapeutic window ranging from 23-fold to 36-fold (EC50s for CHO=12.33 μM, HEp2=7.235 μM, HeLa=7.029 μM and Huh7=5.476 μM)[1].
Purfalcamine (10 mg/kg; oral gavage; BID; for 6 days) demonstrates a delay in the onset of parasitemia in treated mice[1]. Purfalcamine (20 mg/kg; orally gavage) exhibits a Cmax of 2.6 μM with a half-life of 3.1 hours[1]. Animal Model: Male BALB/c mice, 7 weeks of age with the malaria parasite[1]
[1]. Nobutaka Kato, et al. Gene expression signatures and small-molecule compounds link a protein kinase to Plasmodium falciparum motility. Nat Chem Biol. 2008 Jun;4(6):347-56. [2]. Rajshekhar Y Gaji, et al. Expression of the essential Kinase PfCDPK1 from Plasmodium falciparum in Toxoplasma gondii facilitates the discovery of novel antimalarial drugs. Antimicrob Agents Chemother. 2014 May;58(5):2598-607.
Tubulin polymerization-IN-6 (compound 5f) is a potent inhibitor of tubulin polymerization, with an IC50 of 1.09 μM. It not only inhibits cell migration and tube formation but also has anti-angiogenic properties. Additionally, Tubulin polymerization-IN-6 has been found to effectively hinder tumor growth in HT29 xenograft Balb/c nude mice [1].