Hexokinase-Voltage-Dependent Anion Channel complex (HK-VDAC)

The Hexokinase-Voltage-Dependent Anion Channel (HK-VDAC) complex is a pivotal metabolic and regulatory assembly situated on the outer mitochondrial membrane, typically composed of Hexokinase 2 (HK2) and VDAC1 (PMID: 25633308). In malignant cells, this complex facilitates the Warburg effect by coupling mitochondrial ATP production directly to glucose phosphorylation, providing a significant growth advantage (PMID: 19219333). Furthermore, the binding of HK2 to VDAC1 serves a potent anti-apoptotic function by blocking the recruitment of pro-apoptotic proteins such as Bax and preventing the opening of the mitochondrial permeability transition pore (PMID: 12198126). Therapeutic strategies targeting this complex aim to dissociate HK2 from the mitochondria, thereby triggering apoptosis and metabolic collapse in cancer cells (PMID: 20816810). Several agents, including 3-bromopyruvate and lonidamine, have been investigated for their ability to disrupt this interaction or inhibit HK2 activity (PMID: 24531971). Despite its promise, targeting the HK-VDAC complex presents challenges regarding systemic toxicity, as HK2 also plays roles in normal tissues like skeletal and cardiac muscle (PMID: 23842545).

Other names

HK-VDAC1 complexMitochondrial hexokinase complexHK2-VDAC complexHexokinase-Voltage-Dependent Anion Channel 1 complex

The primary mechanism involves the pharmacological dissociation of Hexokinase 2 from VDAC1, which inhibits the preferential use of mitochondrial ATP for glycolysis and removes the steric hindrance that prevents pro-apoptotic proteins from inducing mitochondrial outer membrane permeabilization (PMID: 25633308, PMID: 12198126).