Tumor cell plasma membrane and mitochondrial membranes

The tumor cell plasma membrane and mitochondrial membranes are critical cellular structures that undergo significant biochemical and biophysical alterations during malignant transformation. In many cancer types, the mitochondrial inner membrane exhibits a significantly higher negative electrical potential (hyperpolarization) compared to normal cells, which serves as a driving force for the selective accumulation of delocalized lipophilic cations (DLCs) like MKT-077 [PMID: 15591231, PMID: 8806092]. The plasma membrane of tumor cells also differs from healthy cells in lipid composition, often displaying increased fluidity or the externalization of phosphatidylserine, which can be exploited for targeted delivery or membrane-disrupting therapies [PMID: 23560909]. These membranes are the primary site of action for a class of compounds known as mitocans, which aim to induce apoptosis by causing mitochondrial outer membrane permeabilization (MOMP) or disrupting bioenergetic gradients [PMID: 19785518]. By targeting the structural integrity and electrochemical properties of these membranes, drugs can bypass traditional genetic resistance mechanisms. However, because these structures are fundamental to all eukaryotic cells, achieving high selectivity for tumor membranes over healthy ones remains a significant therapeutic challenge, often leading to off-target effects in mitochondria-rich tissues like the heart [PMID: 17332324].

Other names

Cancer cell membraneMitochondrial inner membraneMitochondrial outer membraneCytoplasmic membraneMitochondrial envelope

Induction of membrane permeabilization, disruption of the transmembrane electrochemical gradient, and triggering of the intrinsic apoptotic pathway through the release of pro-apoptotic factors.