Hypoxia-driven metabolic and molecular reprogramming: From tumor microenvironment to therapeutic interventions

Hypoxia, characterized by reduced oxygen availability, significantly contributes to cancer development by affecting tumor growth and spread. In fast-growing tumors, the scarcity of oxygen forces cancer cells to modify their molecular structure and metabolism to survive and multiply. These alterations are predominantly governed by hypoxia-inducible factors (HIFs), with HIF-1α and HIF-2α serving crucial roles in the activation of genes related to invasion, angiogenesis, metabolic reprogramming, and metastasis. Such changes promote tumor development in low-oxygen environments and enhance resistance to conventional therapies. Hypoxia influences various aspects of cancer progression, heightening the risk of malignancy and worsening prognosis. This study investigates the fundamental mechanisms by which hypoxia influences tumor biology, including the facilitation of the epithelial-to-mesenchymal transition (EMT), the enhancement of angiogenesis through vascular endothelial growth factor (VEGF), and the metabolic shift from oxidative phosphorylation to glycolysis. In this review, we aim to elucidate the complex interaction of metabolic and molecular mechanisms within the cancer microenvironment under hypoxic conditions, which not only fosters tumor growth but also contributes to therapeutic resistance, making hypoxia a critical factor in cancer treatment strategies.