Implementation of Oxygen Enhanced Magnetic Resonance Imaging (OE-MRI) and a Pilot Genomic Study of Hypoxia in Bladder Cancer Xenografts
Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
Fersiynau electronig
Dangosydd eitem ddigidol (DOI)
Background/Aim: Patients with hypoxic bladder cancer benefit from
hypoxia modification added to radiotherapy, but no biomarkers exist to
identify patients with hypoxic tumours. We, herein, aimed to implement
oxygen-enhanced MRI (OE-MRI) in xenografts derived from muscle-invasive
bladder cancer (MIBC) for future hypoxia biomarker discovery work; and
generate gene expression data for future biomarker discovery. Materials
and Methods: The flanks of female CD-1 nude mice inoculated with HT1376
MIBC cells. Mice with small (300 mm3) or large (700 mm3) tumours were imaged, breathing air then 100% O2,
1 h post injection with pimonidazole in an Agilant 7T 16cm bore magnet
interfaced to a Bruker Avance III console with a T2-TurboRARE sequence
using a dynamic MPRAGE acquisition. Dynamic Spoiled Gradient Recalled
Echo images were acquired for 5 min, with 0.1mmol/kg Gd-DOTA (Dotarem,
Guerbet, UK) injected after 60 s (1 ml/min). Voxel size and field of
view of dynamic contrast enhanced (DCE)-MRI and OE-MRI scans were
matched. The voxels considered as perfused with significant
post-contrast enhancement (p<0.05) in DCE-MRI scans and tissue were
further split into pOxyE (normoxic) and pOxyR (hypoxic) regions. Tumours
harvested in liquid N2, sectioned, RNA was extracted and
transcriptomes analysed using Clariom S microarrays. Results: Imaged
hypoxic regions were greater in the larger versus smaller tumour.
Expression of known hypoxia-inducible genes and a 24 gene bladder cancer
hypoxia score were higher in pimonidazole-high versus -low regions: CA9
(p=0.012) and SLC2A1 (p=0.012) demonstrating expected transcriptomic
behaviour. Conclusion: OE-MRI was successfully implemented in
MIBC-derived xenografts. Transcriptomic data derived from hypoxic and
non-hypoxic xenograft regions will be useful for future studies.
Iaith wreiddiol | Saesneg |
---|---|
Tudalennau (o-i) | 380-387 |
Nifer y tudalennau | 8 |
Cyfnodolyn | Cancer Genomics & Proteomics |
Cyfrol | 21 |
Rhif y cyfnodolyn | 4 |
Dynodwyr Gwrthrych Digidol (DOIs) | |
Statws | Cyhoeddwyd - 27 Meh 2024 |