A PI3Kγ inhibitor
PI3Kγ is one of four class I PI3Ks, a family of dual lipid and protein kinases involved in the regulation of numerous biological processes, such as cell growth, differentiation, survival, proliferation and migration1. A high-throughput chemoproteomics method has benen optimized to enable multiplexed screening resulting in the finding of CZC24832.
In vitro: Plenty of target- and cell-based studies of CZC24832 revealed regulation of interleukin-17–producing T helper cell (TH17) differentiation by PI3Kg, therefore giving selective inhibition of PI3Kg as a potential treatment for inflammatory and autoimmune diseases [1].
In vivo: CZC24832, the first selective inhibitor of phosphoinositide 3-kinase g (PI3Kg), was found to have efficacy in in vivo models of inflammation [1].
Clinical trial: Currenlty no clinical data are available.
Reference:
[1] Bergamini G, Bell K, Shimamura S, Werner T, Cansfield A, Müller K, Perrin J, Rau C, Ellard K, Hopf C, Doce C, Leggate D, Mangano R, Mathieson T, O'Mahony A, Plavec I, Rharbaoui F, Reinhard F, Savitski MM, Ramsden N, Hirsch E, Drewes G, Rausch O, Bantscheff M, Neubauer G. A selective inhibitor reveals PI3Kγ dependence of T(H)17 cell differentiation. Nat Chem Biol. 2012;8(6):576-82.
Cell experiment: | RAW264.7 or THP-1 cells are starved for 2.5 h in serum-free medium before CZC24832 (0.1, 1, 10 and 100 μM) incubation for 30 min at 37°C. RAW264.7 cells are then stimulated for 3 min with C5a at a concentration of 0.6 μM, and THP-1 cells are stimulated with either insulin (1 uM, 10 min) or CSF (50 μg/mL, 5 min) at 37°C and lysed on ice. The detection of AKT phosphorylation (Ser473) is performed using the iBlot system[1]. |
Animal experiment: | Rats[1]Pharmacokinetics and oral bioavailability of CZC24832 are investigated in male Wistar rats following administration of a single intravenous (0.2 mg per kg body weight) or oral dose (10 mg per kg body weight). The dosing vehicle used is 0.5% (w/v) carboxymethyl cellulose in water for oral gavage. The intravenous dosing vehicle is 10% (v/v) DMSO in 30% (v/v) polyethylene glycol (PEG-400). Heparin blood for pharmacokinetic analysis is withdrawn retro-orbitally from mice or sublingually from rats to prepare plasma samples. These are homogenized with 10% (v/v) water and 3 volumes of acetonitrile and analyzed for CZC24832 by HPLC-MS/MS. |
参考文献: [1]. Bergamini G, et al. A selective inhibitor reveals PI3Kγ dependence of T(H)17 cell differentiation. Nat Chem Biol. 2012 Apr 29;8(6):576-82. | |
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