期刊
BRITISH JOURNAL OF HAEMATOLOGY
卷 149, 期 4, 页码 550-559出版社
WILEY
DOI: 10.1111/j.1365-2141.2010.08144.x
关键词
multiple myeloma; pharmacology; apoptosis
类别
资金
- NIH [SPORE-P50100707, PO1-CA078378, RO1CA050947]
- The LeBow Family Fund
P>Our previous study showed that the novel proteasome inhibitor NPI-0052 induces apoptosis in multiple myeloma (MM) cells resistant to conventional and bortezomib (Velcade (TM), Takeda, Boston, MA, USA) therapies. In vivo studies using human MM-xenografts demonstrated that NPI-0052 is well tolerated, prolongs survival, and reduces tumour recurrence. These preclinical studies provided the basis for an ongoing phase-1 clinical trial of NPI-0052 in relapsed/refractory MM patients. Here we performed pharmacodynamic (PD) studies of NPI-0052 using human MM xenograft murine model. Our results showed that NPI-0052: (i) rapidly left the vascular compartment in an active form after intravenous (i.v.) administration, (ii) inhibited 20S proteasome chymotrypsin-like (CT-L, beta 5), trypsin-like (T-L, beta 2), and caspase-like (C-L, beta 1) activities in extra-vascular tumours, packed whole blood (PWB), lung, liver, spleen, and kidney, but not brain and (iii) triggered a more sustained (> 24 h) proteasome inhibition in tumours and PWB than in other organs (< 24 h). Tissue distribution analysis of radiolabeled compound (3H-NPI-0052) in mice demonstrated that NPI-0052 left the vascular space and entered organs as the parent compound. Importantly, treatment of MM.1S-bearing mice with NPI-0052 showed reduced tumour growth without significant toxicity, which was associated with prolonged inhibition of proteasome activity in tumours and PWB but not normal tissues.
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