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Lipid kinase activity
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IC50 values were measured using a standard lipid kinase activity with PI as a substrate. The differences were that (i) 100 μM cold ATP was used instead of 10 μM, (ii) the DMSO concentration was 1% rather than 2%, and (iii) [γ-33P]ATP was used instead of [γ-32P]ATP. The TLC plates were quantified using a phosphorimager screen. The reported IC50 values were determined by non-linear regression analysis on the basis of at least three independent experiments repeated across multiple preparations of recombinant protein.
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Applications
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In PC3 cells, TGX-221 treatment (0.2, 2, and 20 μM) inhibited cell proliferation, and significantly reduced the activity of the p110β PI3K isoform.
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Applications
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At the doses of 1 + 1 (49 % ± 13.9%) and 3 + 3 (88 % ± 10.6%), TGX-221 improved integrated blood flow over 30 mins in a mouse model. In addition, Tail bleeding time (BT) (sec) increased with TGX-221 doses of 3 + 3 (median 1560) and 1 + 1 (1305). In all TGX-221 groups, mean renal BT (sec) also increased.
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References:
[1]. Chaussade C, Rewcastle GW, Kendall JD, Denny WA, Cho K, Gr?nning LM, Chong ML, Anagnostou SH, Jackson SP, Daniele N, Shepherd PR. Evidence for functional redundancy of class IA PI3K isoforms in insulin signalling. Biochem J. 2007 Jun 15;404(3):449-58.
[2]. Straub A, Wendel HP, Dietz K, Schiebold D, Peter K, Schoenwaelder SM, Ziemer G. Selective inhibition of the platelet phosphoinositide 3-kinase p110beta as promising new strategy for platelet protection during extracorporeal circulation. Thromb Haemost. 2008 Mar;99(3):609-15.
[3]. Bird JE, Smith PL, Bostwick JS, Shipkova P, Schumacher WA. Bleeding response induced by anti-thrombotic doses of a phosphoinositide 3-kinase (PI3K)-β inhibitor in mice. Thromb Res. 2011 Jun;127(6):560-4.
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