Photodynamic Biomimetic Nanoparticles Accelerate Tumor Vascular
Normalization Initiation
Abstract
The abnormal tumor vascular networks fuel the tumor growth and aggravate
the tumor hypoxia. Although vascular normalization therapy (VNT) was
clinically effective, the long period before vascular normalization
window (VNW) initiation presents significant prognostic challenges.
Here, we developed a platelet-mimetic nano-system, IA@PM, which was
self-assembled by apatinib (APA) and indocyanine green and further
coated with platelet membrane (PM). IA@PM accelerates the pro-angiogenic
and anti-angiogenic factors balance to significantly expedite the VNW
initiation of APA from the 4th day to the 2nd day post-treatment through
rationally utilizing photodynamic therapy (PDT). Benefiting from this
VNW initiation acceleration, the timelier and facilitated tumor drug
delivery was achieved. This process further constructs a self-amplified
therapeutic cycle between VNT and PDT, contributing to the excellent
antitumor effects. Collectively, IA@PM breaks key limiting factors in
current VNT efficacy by accelerating VNW initiation and also
significantly promotes PDT antitumor efficacy with lower doses of ICG,
bringing revolutionary new strategies in VNT.