Cell membrane and intracellular metal ions in the nanoliposomal delivery context

This entry describes a complex interaction environment and delivery strategy rather than a single molecular target. In the context of nanoliposomal delivery, the cell membrane serves as the primary biological barrier and the site for endocytic uptake of nanocarriers (Sahay et al., 2010, Nature Biotechnology). Metal ions, such as copper (Cu2+), zinc (Zn2+), or manganese (Mn2+), are frequently used within the aqueous core of liposomes to facilitate the 'remote loading' of drugs by forming stable metal-drug complexes (Abraham et al., 2005, Journal of Controlled Release). This method allows for high drug encapsulation efficiency and improved pharmacokinetic stability. Upon cellular internalization, the intracellular environment—characterized by specific pH levels and the presence of endogenous metal ions—influences the dissociation of the drug from the liposomal carrier and its subsequent therapeutic activity (Zucker et al., 2009, Journal of Controlled Release). This approach is widely applied in oncology to enhance the delivery of potent chemotherapeutic agents like doxorubicin or irinotecan while reducing systemic side effects. Understanding the interplay between membrane dynamics and metal-ion chemistry is critical for the design of effective nanomedicines.

Other names

Metal-ion mediated drug deliveryRemote loading via metal gradientsLiposomal metal-ion complexesTransmembrane metal-ion gradients

Metal ions are utilized to create transmembrane gradients for the active remote loading of amphipathic weak bases into nanoliposomes. Once internalized by cells via endocytosis, the interaction between the liposomal carrier, the cell membrane, and the intracellular environment (including endogenous metal ions and pH shifts) facilitates the controlled release and accumulation of the drug payload.