Effect of hypoxia-inducible factors in tumor infiltrating macrophage on tumor growth

Abstract

Tumor blood vessel structure is different from normal blood vessel features in terms of short lumen diameter, serpentine course and poor tight junction formation. These phenomena lead to form specific tissue environment, so called tumor microenvironments (TME). The TME polarizes tumor-infiltrating macrophages towards tumor supportive phenotype. We have previously reported that prolyl-hydroxylase inhibitor (PHDi) improved blood flow, hypoxia and TME in tumor tissues. The PHDi action mechanism is PHD inhibition, resulting in increasing hypoxia-inducing factors (HIFs) expression level. But the detail of its mechanism is unclear. In this study, we investigated the effect of HIFs in tumor infiltrating macrophage on tumor growth of PHD inhibitors on tumor progression.