Cell lines

Ba/F3-FLT3-ITD cells, Ba/F3 cells, M0-91 and IMS-M2 cells

Preparation method

The solubility of this compound in DMSO is > 10 mM. General tips for obtaining a higher concentration: Please warm the tube at 37 ℃ for 10 minutes and/or shake it in the ultrasonic bath for a while. Stock solution can be stored below -20℃ for several months.

Reacting condition

0.01–1 μM, 24–72 hr

Applications

PKC412 showed a broad antiproliferative activity against various tumor and normal cell lines in vitro, and was able to reverse the Pgp-mediated multidrug resistance of tumor cells. PKC412 resulted in a dose-dependent increase in the G2/M phase of the cell cycle concomitant with increased polyploidy, apoptosis and enhanced sensitivity to ionizing radiation. PKC412 inhibited the proliferation of Ba/F3-FLT3-ITD cells with an IC50 of less than 10 nM within 24–72 hr, and was nontoxic toward parental Ba/F3 cells at concentrations up to 100 nM. PKC412 inhibited proliferation and viability of Ba/F3-FLT3-D835Y cells. PKC412 (0.01–1 μM, 15 min) potently inhibited FLT3 tyrosine phosphorylation in Ba/F3-FLT3-ITD and Ba/F3-FLT3-D835Y cells. In Ba/F3-FLT3-ITD cells, treatment with PKC412 (up to 0.04 μM) over a span of two months generated a polyclonal subline of Ba/F3-FLT3-ITD cells less sensitive to PKC412. PKC412 inhibited EN fusion tyrosine kinase in hematopoietic Ba/F3 cells. PKC412 significantly inhibited EN phosphorylation in M0-91 and IMS-M2 cells in a dose-dependent manner.

Animal models

Balb/c mice with FLT3/ITD-induced myeloproliferative disorder (MPD)

Dosage form

Oral administration, 100 mg/kg

Application

Combination of PKC412 with loco-regional ionizing irradiation showed significant antitumor activity against tumors which are resistant to both ionizing radiation and chemotherapeutic agents (dysfunctional p53). Orally administered PKC412 strongly inhibited retinal neovascularization as well as laser-induced choroidal neovascularization in murine models. In Balb/c mice with FLT3/ITD-induced myeloproliferative disorder (MPD), PKC412 prolonged survival. PKC412 inhibited FLT3-ITD-mediated transformation. PKC412-treated mice displayed only a slight increase in mean spleen weight (80 mg). PKC412 (25 mg/kg, i.p.) protected cultured A549 cells that expressed mutant or wild-type K18 and mouse livers of the K18 Arg90Cys-overexpressing transgenic mice from Fas-induced apoptosis.

Other notes

Please test the solubility of all compounds indoor, and the actual solubility may slightly differ with the theoretical value. This is caused by an experimental system error and it is normal.

Midostaurin is an inhibitor of PKC with IC50 values of 22nM, 30nM, 31nM, 24nM, 330nM, 160nM and 1.25μM for PKC-α, PKC-β1, PKC-β2, PKC-γ, PKC-δ, PKC-η and PKC-ε, respectively [1].

Midostaurin is a PKC inhibitor with potent activity against most PKC subtypes. It also has inhibitory activity against KDR and its mouse homologue Flk-1. Other protein kinases involved in angiogenesis, cell cycle and cell growth are not sensitive to midostaurin. Midostaurin shows reversible inhibition of intracellular PKC activity with IC50 value of 0.5μM. Besides PKC, midostaurin inhibits the autophosphorylation of the receptors for PDGF, VEGF and stem cell factor with IC50 values of 80nM, 1μM and 30nM, respectively. Midostaurin also inhibits the FGF-induced c-fos transcription and MAPK activation. Moreover, midostaurin suppresses cell growth of different cell lines through inducing cell cycle arrest in G2/M and inducing apoptosis [1].

Furthermore, midostaurin exerts antitumor activity via inhibiting tumor angiogenesis and proliferation due to its effects on VEGFR and PKC, respectively. Administration of midostaurin prolongs the life span of mice bearing B16 melanoma at dose of 75mg/kg 3 times daily for 9 days [1].

References:
[1] Fabbro D, Buchdunger E, Wood J, et al. Inhibitors of protein kinases: CGP 41251, a protein kinase inhibitor with potential as an anticancer agent. Pharmacology & therapeutics, 1999, 82(2): 293-301.