Linifanib (ABT-869)

 

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Biological Activity

Description	Linifanib (ABT-869) is a novel, potent ATP-competitive VEGFR/PDGFR inhibitor for KDR, CSF-1R, Flt-1/3 and PDGFRβ with IC50 of 4 nM, 3 nM, 3 nM/4 nM and 66 nM respectively, mostly effective in mutant kinase-dependent cancer cells (i.e. FLT3). Phase 3.
Targets	KDR	CSF-1R	Flt-1	Flt-3	PDGFRβ
IC50	4 nM	3 nM	3 nM	4 nM	66 nM [1]
In vitro	Linifanib shows inhibitory to Kit, PDGFRβ and Flt4 with IC50 of 14 nM, 66 nM and 190 nM in kinases assay. Linifanib also inhibits ligand-induced KDR, PDGFRβ, Kit, and CSF-1R phosphorylation with IC50 of 2 nM, 2 nM, 31 nM and 10 nM at cellular level and this cellular potency could be affected by serum protein. Linifanib suppresses VEGF-stimulated HUAEC proliferation with IC50 of 0.2 nM. While Linifanib has weak activity against tumor cells which are not induced by VEGF or PDGF, except for MV4-11 leukemia cells (with constitutively active form of Flt3) with IC50 of 4 nM. Linifanib could cause a decrease in S and G2-M phases with a corresponding increase in the sub-G0-G1 apoptotic population in MV4-11 cells. [1] Linifanib binds to the ATP-binding site of CSF-1R with Ki of 3 nM. [2] Linifanib (10 nM) exhibits a reduced phosphorylation of Akt at Ser473 and decreased phosphorylation of GSK3βat Ser9 in Ba/F3 FLT3 ITD cell lines. [3]
In vivo	Linifanib (0.3 mg/kg) results in complete inhibition of KDR phosphorylation in lung tissue. Linifanib also inhibits the edema response with ED50 of 0.5 mg/kg. Linifanib (7.5 and 15 mg/kg, bid) significantly inhibits both bFGF- and VEGF-induced angiogenesis in the cornea. Linifanib inhibits tumor growth in flank xenograft models including HT1080, H526, MX-1 and DLD-1 with ED75 from 4.5-12 mg/kg. Linifanib also shows efficacy in A431 and MV4-11 xenografts at low dose levels. Linifanib (12.5 mg/kg bid) reveals a decrease of microvasculure density in MDA-231 xenograft. Linifanib shows a Cmax and AUC24 hours with 0.4 μg/mL and 2.7 μg•hour/mL in HT1080 fibrosarcoma model. [1]
Features

Protocol(Only for Reference)

Kinase Assay: ^[1]

Kinase assays

Potencies (IC50 values) are determined by assays of active kinase domains cloned and expressed in baculovirus using the FastBacbaculovirus expression system or obtained commercially. For tyrosine kinase assays, a biotinylated peptide substrate containing a single tyrosine is used with 1 mM ATP, anEu-cryptate–labeled anti-phosphotyrosine antibody (PT66), and Strepavidin-APC in a homogeneous time-resolved fluorescence assay. Serine/threonine kinases are assayed using 5 μM ATP, [33P]ATP, and a biotinylated peptide substrate with peptide capture and incorporation of 33P determined using a SA-Flashplate. Linifanib is assayed at multiple concentrations prepared by serial dilution of a DMSO stock solution of Linifanib. The concentration resulting in 50% inhibition of activity is calculated using nonlinear regression analysis of the concentration response data.

Cell Assay: ^[1]

Cell lines	HUAEC, HT-29, HT1080, A431, MDA-435, MDA-231, H526, DLD-1, 9L and MV4-11 cells
Concentrations	0-100 μM
Incubation Time	72 hours
Method	Cells are seeded into 96-well plates at 2.5 × 103 per well and incubated with serum-free medium for 24 hours. Linifanib and VEGF (final, 10 ng/mL) are added and incubated for 72 hours in serum-free medium. For carcinoma cell lines, 3 × 103 cells/well are plated overnight in full growth medium. Linifanib is added to the cells in full growth medium and incubated for 72 hours. For leukemia cells, generally 5 × 104 per well are plated in full growth medium, Linifanib is added, and incubated for 72 hours. The effects on proliferation are determined by addition of Alamar Blue (final solution, 10%), incubation for 4 hours at 37 °C in a CO2 incubator and analysis in a fluorescence plate reader (544 nm, excitation: 590 nm, emission

Animal Study: ^[1]

Animal Models	H526, DLD-1, MDA-231, MDA-435LM, HCT-116, H526, DLD-1, MDA-231, MDA-435LM, MV4-11 and MX-1 xenografts are established in mice.
Dosages	~ 10 mg/kg
Administration	Oral administration
Solubility	30% PEG400/0.5% Tween80/5% propylene glycol, 30 mg/mL

1

References

Clinical Trial Information( data from http://clinicaltrials.gov)

NCT Number	Recruitment	Conditions	Sponsor /Collaborators	Start Date	Phases
NCT01365910	Suspended	Recurrent Colon Cancer|Recurrent Rectal Cancer|Stage IVA Colon Cancer|Stage IVA Rectal Cancer|Stage IVB Colon Cancer|Stage IVB Rectal Cancer	Vanderbilt-Ingram Cancer Center	2011-06	Phase 2
NCT01413893	Completed	Advanced Solid Tumors	Abbott	2011-06	Phase 1
NCT01286974	Terminated	Advanced Solid Tumors	Abbott	2011-08	Phase 1
NCT01506934	Terminated	Advanced or Metastatic Solid Tumors	Abbott	2011-10	Phase 1

Chemical Information

Download Linifanib (ABT-869) SDF

Chemical Name	1-(4-(3-amino-1H-indazol-4-yl)phenyl)-3-(2-fluoro-5-methylphenyl)urea

Preparing Stock Solutions

Stock Solution (1ml DMSO)	1mM	10mM	20mM	30mM
Mass(mg)	0.37541	3.7541	7.5082	11.2623

Customer Reviews (3)

Click to enlarge	Rating
	Source	J Pharmacol Exp Ther, 2012, 343(3), 617-27. Linifanib (ABT-869) purchased from Selleck
	Method	ELISA/Kinase Assays
	Cell Lines	Mice-bearing tumors
	Concentrations	25 mg/kg
	Incubation Time	0-7 day
	Results	ABT-348 inhibited the VEGF response with a potency (ED 50 = 0.2 mg/kg i.v.) that is comparable with another potent anti-VEGF agent, ABT-869, which has intrinsic VEGFR2 potency similar to ABT-348 (IC 50 = 4 and 3 nM, respectively). On-target VEGF receptor inhibition was also implicated by the observation that administration of ABT-348 to tumor-bearing mice resulted in increased plasma levels of the proangiogenic PLGF (Fig. B). acute changes in the MRI signal were observed during treatment with ABT-348 (Fig. C). After a sharp decrease in Ktrans that was apparent within 24 h after the first treatment cycle of ABT-348, the MRI signal returned to pretreatment levels by 6 days when reassessed longitudi-nally, which was reflective of the Q7D-dosing sequence. (Fig. D) the reduction in Ktrans (75%) was similar in magnitude to that previously reported for the selective EGFR/PDGFR inhibitor.

Product Citations (2)

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  TSLP signaling network revealed by SILAC-based phosphoproteomics. [Zhong J, et al. Mol Cell Proteomics 2012;11(6):M112]

  
  PubMed: 22345495


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  Targeting PDGFR-β in Cholangiocarcinoma. [Fingas CD, et al. Liver Int 2011;32(3):400-9]

  
  PubMed: 22133064