Discovery of 3H-benzo[4,5]thieno[3,2-d]pyrimidin-4-ones as potent, highly selective, and orally bioavailable inhibitors of the human protooncogene proviral insertion site in moloney murine leukemia virus (PIM) kinases.
Pim-1, Pim-2, and Pim-3 are a family of serine/threonine kinases which have been found to be overexpressed in a variety of hematopoietic malignancies and solid tumors. Benzothienopyrimidinones were discovered as a novel class of Pim inhibitors that potently inhibit all three Pim kinases with subnanomolar to low single-digit nanomolar K(i) values and exhibit excellent selectivity against a panel of diverse kinases. Protein crystal structures of the bound Pim-1 complexes of benzothienopyrimidinones 3b (PDB code 3JYA), 6e (PDB code 3JYO), and 12b (PDB code 3JXW) were determined and used to guide SAR studies. Multiple compounds exhibited potent antiproliferative activity in K562 and MV4-11 cells with submicromolar EC(50) values. For example, compound 14j inhibited the growth of K562 cells with an EC(50) value of 1.7 muM and showed K(i) values of 2, 3, and 0.5 nM against Pim-1, Pim-2, and Pim-3, respectively. These novel Pim kinase inhibitors efficiently interrupted the phosphorylation of Bad in both K562 and LnCaP-Bad cell lines, indicating that their potent biological activities are mechanism-based. The pharmacokinetics of 14j was studied in CD-1 mice and shown to exhibit bioavailability of 76% after oral dosing. ADME profiling of 14j suggested a long half-life in both human and mouse liver microsomes, good permeability, modest protein binding, and no CYP inhibition below 20 muM concentration.
Cancer Research, Global Pharmaceutical Research and Development, Abbott Laboratories, Abbott Park, Illinois 60064, USA. zhi-fu.tao@abbott.com
Zhi-Fu
ZF
Tao
Lisa A
LA
Hasvold
Joel D
JD
Leverson
Edward K
EK
Han
Ran
R
Guan
Eric F
EF
Johnson
Vincent S
VS
Stoll
Kent D
KD
Stewart
Geoff
G
Stamper
Nirupama
N
Soni
Jennifer J
JJ
Bouska
Yan
Y
Luo
Thomas J
TJ
Sowin
Nan-Horng
NH
Lin
Vincent S
VS
Giranda
Saul H
SH
Rosenberg
Thomas D
TD
Penning
D000284:Administration, Oral; D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000493:pharmacokinetics / Q000494:pharmacology; D001682:Biological Availability; D045744:Cell Line, Tumor; D002463:Cell Membrane Permeability; D006801:Humans; D066298:In Vitro Techniques; D051379:Mice; D008862:Microsomes, Liver / Q000378:metabolism; D008958:Models, Molecular; D010766:Phosphorylation; D011487:Protein Conformation; D051573:Proto-Oncogene Proteins c-pim-1 / Q000037:antagonists & inhibitors* / Q000737:chemistry; D011743:Pyrimidines / Q000138:chemical synthesis* / Q000493:pharmacokinetics / Q000494:pharmacology; D011744:Pyrimidinones / Q000138:chemical synthesis* / Q000493:pharmacokinetics / Q000494:pharmacology; D013329:Structure-Activity Relationship; D013876:Thiophenes / Q000138:chemical synthesis* / Q000493:pharmacokinetics / Q000494:pharmacology; D051025:bcl-Associated Death Protein / Q000378:metabolism
D000970:Antineoplastic Agents; D011743:Pyrimidines; D011744:Pyrimidinones; D013876:Thiophenes; D051025:bcl-Associated Death Protein; D051573:Proto-Oncogene Proteins c-pim-1