The heat tolerance of tumor cells induced by heat shock
proteins
(HSPs) is the major factor that seriously hinders further application
of PTT, as it can lead to tumor inflammation, invasion, and even recurrence.
Therefore, new strategies to inhibit HSPs expression are essential
to improve the antitumor efficacy of PTT. Here, we prepared a novel
nanoparticle inhibitor by synthesizing molecularly imprinted polymers
with a high imprinting factor (3.1) on the Prussian Blue surface (PB@MIP)
for combined tumor starvation and photothermal therapy. Owing to using
hexokinase (HK) epitopes as the template, the imprinted polymers could
inhibit the catalytic activity of HK to interfere with glucose metabolism
by specifically recognizing its active sites and then achieve starvation
therapy by restricting ATP supply. Meanwhile, MIP-mediated starvation
downregulated the ATP-dependent expression of HSPs and then sensitized
tumors to hyperthermia, ultimately improving the therapeutic effect
of PTT. As the inhibitory effect of PB@MIP on HK activity, more than
99% of the mice tumors were eliminated by starvation therapy and enhanced
PTT.