Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Pivot Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Target Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Query: UNIPROT:Q8IXL6 (
RNS
)
1,091
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
RRx-001 is an anticancer agent that subjects cancer cells to reactive oxygen/nitrogen species (ROS/
RNS
) and acts as an epigenetic modifier. We have used a thiol-bearing MRI contrast agent, Gd-LC7-SH, to investigate the pharmacodynamics of RRx-001 in
CHP
-100 Ewing's Sarcoma, HT-29 colorectal carcinoma, and PANC-1 pancreatic carcinoma xenografts in SCID mice. Binding of Gd-LC7-SH to the Cys
34
residue on plasma albumin prolongs retention in the tumor microenvironment and increases tumor enhancement on MRI. Mice were imaged by MRI and
in vivo
T1 maps acquired 50 min (T1
50 min
) after injection of 0.05 mmol/kg Gd-LC7-SH (i.v.) at baseline and 1, 24, and 72 h post-treatment with 10 mg/kg RRx-001 (i.v.). Consistent with an indirect thiol-modifying activity of RRx-001, tumor T1
50 min
at 1 h post-drug was significantly longer than pre-drug tumor T1
50 min
in all three tumor models, with the T1
50 min
remaining significantly longer than baseline through 72 h post-drug in the HT-29 and PANC-1 tumors. The T1
50 min
of
CHP
-100 tumors recovered to baseline by 24 h post-drug, suggesting a robust anti-oxidant response to the RRx-001 challenge that was presaged by a marked increase in perfusion at 1 h post-drug measured by DCE-MRI. MRI enhanced with Gd-LC7-SH provides a mechanistically rational biomarker of RRx-001 pharmacodynamics.
...
PMID:Magnetic resonance imaging of RRx-001 pharmacodynamics in preclinical tumors. 2925 66
