Mechanisms of tumor vascular priming by a nanoparticulate doxorubicin formulation.

Abstract:

PURPOSE:Tumor vascular normalization by antiangiogenic agents may increase tumor perfusion but reestablish vascular barrier properties in CNS tumors. Vascular priming via nanoparticulate carriers represents a mechanistically distinct alternative. This study investigated mechanisms by which sterically-stabilized liposomal doxorubicin (SSL-DXR) modulates tumor vascular properties. METHODS:Functional vascular responses to SSL-DXR were investigated in orthotopic rat brain tumors using deposition of fluorescent permeability probes and dynamic contrast-enhanced magnetic resonance imaging. Microvessel density and tumor burden were quantified by immunohistochemistry (CD-31) and quantitative RT-PCR (VE-cadherin). RESULTS:Administration of SSL-DXR (5.7 mg/kg iv) initially (3-4 days post-treatment) decreased tumor vascular permeability, k(trans) (vascular exchange constant), vascular endothelial cell content, microvessel density, and deposition of nanoparticulates. Tumor vasculature became less chaotic. Permeability and perfusion returned to control values 6-7 days post-treatment, but intratumor SSL-DXR depot continued to effect tumor vascular endothelial compartment 7-10 days post-treatment, mediating enhanced permeability. CONCLUSIONS:SSL-DXR ultimately increased tumor vascular permeability, but initially normalized tumor vasculature and decreased tumor perfusion, permeability, and nanoparticulate deposition. These temporal changes in vascular integrity resulting from a single SSL-DXR dose have important implications for the design of combination therapies incorporating nanoparticle-based agents for tumor vascular priming.

journal_name

Pharm Res

journal_title

Pharmaceutical research

authors

Roy Chaudhuri T,Arnold RD,Yang J,Turowski SG,Qu Y,Spernyak JA,Mazurchuk R,Mager DE,Straubinger RM

doi

10.1007/s11095-012-0823-4

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

3312-24

issue

12

eissn

0724-8741

issn

1573-904X

journal_volume

29

pub_type

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