Cellular components involved in macropinocytosis and vacuolization

Cellular components involved in macropinocytosis and vacuolization represent a group of molecular entities that regulate the large-scale internalization of extracellular fluid and the subsequent formation of cytoplasmic vacuoles. Macropinocytosis is a clathrin-independent endocytic process often exploited by cancer cells, particularly those with RAS mutations, to scavenge nutrients from the microenvironment (Commisso et al., 2013). When this process is hyperactivated or when endosomal trafficking is disrupted, it leads to the accumulation of large vacuoles, eventually resulting in a non-apoptotic cell death known as methuosis (Maltese & Overmeyer, 2014). Pharmacological agents like MOMPP and MIPP are known to induce this phenotype by interacting with these components, although the precise molecular identities of all involved proteins have not been fully characterized (Overmeyer et al., 2011). These components are of significant interest in oncology as they provide a mechanism to induce death in cells that are resistant to conventional apoptosis. Additionally, because macropinocytosis is a key entry route for certain viruses and bacteria, these components are also relevant in the context of infectious diseases (Mercer & Helenius, 2009). Targeting this pathway requires careful calibration to avoid systemic toxicity, as macropinocytosis also plays roles in normal physiological processes like immune surveillance by dendritic cells (Lim & Gleeson, 2011).

Other names

Unknown cellular components involved in macropinocytosis and vacuolizationMethuosis-associated targetsMacropinocytosis pathway componentsVacuolization-inducing factorsMOMPP targets

Induction of methuosis through hyperstimulation of macropinocytosis and inhibition of endosomal trafficking/recycling, or inhibition of macropinocytotic nutrient uptake.