Syringolin B-inspired proteasome inhibitor analogue TIR-203 exhibits enhanced biological activity in multiple myeloma and neuroblastoma.

Abstract:

CONTEXT:The bacterium Pseudomonas syringae pv. syringae (Pss) is a pathogen of many plant species and causes, for example, brown spot disease in bean plants (Phaseolus vulgaris). Pss excretes the syringolins, natural product molecules that act as a virulence factors and inhibit the proteasome of the host plants. OBJECTIVE:Proteasome inhibitors belong to an important class of anticancer agents and bortezomib (Velcade(®)) has been Food and Drug Administration-approved for the treatment of multiple myeloma (MM) and mantle cell lymphoma. Syringolins represent a new class of proteasome inhibitors and the present work was undertaken to design a potent syringolin-inspired analogue (TIR-203) for anticancer drug development. MATERIALS AND METHODS:TIR-203 was tested against human MM and neuroblastoma (NB) cells. Cancer cells were treated with TIR-203 at various concentrations (0-10 µM) and the cell viability was measured using the MTS assay. To determine the effects on proteasomal activities, the cell culture-based proteasome inhibition assay was used. Syringolin A (SylA) and bortezomib were included as controls. RESULTS:TIR-203 inhibited the cell proliferation of MM and NB cells in a dose-dependent manner at significantly lower concentrations than SylA. In MM cells, TIR-203 effectively inhibited the chymotrypsin-like (CT-L), caspase-like (C-L), and trypsin-like (T-L) activities of the proteasome. In NB cells, TIR-203 inhibited the CT-L and C-L activities, but not the T-L activity. DISCUSSION AND CONCLUSIONS:The newly designed proteasome inhibitor TIR-203 is more potent than the natural product SylA and strongly inhibits the cell viability and proteasomal activity of MM and NB cells.

journal_name

Pharm Biol

journal_title

Pharmaceutical biology

authors

Opoku-Ansah J,Ibarra-Rivera TR,Pirrung MC,Bachmann AS

doi

10.3109/13880209.2011.626784

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

25-9

issue

1

eissn

1388-0209

issn

1744-5116

journal_volume

50

pub_type

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