Small Molecule Inhibition of MicroRNA miR-21 Rescues Chemosensitivity of Renal-Cell Carcinoma to Topotecan
摘要:
Chemical probes of microRNA (miRNA) function are potential tools for understanding miRNA biology that also provide new approaches for discovering therapeutics for miRNA-associated diseases. MicroRNA-21 (miR-21) is an oncogenic miRNA that is overexpressed in most cancers and has been strongly associated with driving chemoresistance in cancers such as renal cell carcinoma (RCC). Using a cell-based luciferase reporter assay to screen small molecules, we identified a novel inhibitor of miR-21 function. Following structure-activity relationship studies, an optimized lead compound demonstrated cytotoxicity in several cancer cell lines. In a chemoresistant-RCC cell line, inhibition of miR-21 via small molecule treatment rescued the expression of tumor-suppressor proteins and sensitized cells to topotecan-induced apoptosis. This resulted in a > 10-fold improvement in topotecan activity in cell viability and clonogenic assays. Overall, this work reports a novel small molecule inhibitor for perturbing miR-21 function and demonstrates an approach to enhancing the potency of chemotherapeutics specifically for cancers derived from oncomir addiction.
Pyridin-3-yl derivatives as immunomodulating agents
申请人:Bolli Martin
公开号:US20100168005A1
公开(公告)日:2010-07-01
The invention relates to pyridin-3-yl derivatives of Formula (I) wherein R
1
, R
2
, R
3
, R
4
, R
5
; R
6
and A are as described in the description, their preparation and their use as pharmaceutically active compounds. Said compounds particularly act as immunomodulating agents.
Pyridin-4-yl derivatives as immunomodulating agents
申请人:Bolli Martin
公开号:US20100063108A1
公开(公告)日:2010-03-11
The invention relates to pyridine derivatives of Formula (I) wherein A, R
1
, R
2
, R
3
, R
4
, R
5
, and R
6
are as described in the description, their preparation and their use as pharmaceutically active compounds. Said compounds particularly act as immunomodulating agents.
Bis-aryloxadiazoles as effective activators of the aryl hydrocarbon receptor
作者:Kaitlin J. Basham、Vasudev R. Bhonde、Collin Kieffer、James B.C. Mack、Matthew Hess、Bryan E. Welm、Ryan E. Looper
DOI:10.1016/j.bmcl.2014.04.013
日期:2014.6
Bis-aryloxadiazoles are common scaffolds in medicinal chemistry due to their wide range of biological activities. Previously, we identified a 1,2,4-bis-aryloxadiazole that blocks mammary branching morphogenesis through activation of the aryl hydrocarbon receptor (AHR). In addition to defects in mammary differentiation, AHR stimulation induces toxicity in many other tissues. We performed a structure activity relationship (SAR) study of 1,2,4-bis-aryloxadiazole to determine which moieties of the molecule are critical for AHR activation. We validated our results with a functional biological assay, using desmosome formation during mammary morphogenesis to indicate AHR activity. These findings will aid the design of oxadiazole derivative therapeutics with reduced off-target toxicity profiles. (C) 2014 Elsevier Ltd. All rights reserved.
PYRIDIN-3-YL DERIVATIVES AS IMMUNOMODULATING AGENTS
申请人:Actelion Pharmaceuticals Ltd.
公开号:EP2069335A1
公开(公告)日:2009-06-17
PYRIDIN-4-YL DERIVATIVES AS IMMUNOMODULATING AGENTS