arginine-rich cell-penetrating peptides Cationic arginine-rich peptides (CARPs - Polyargininepeptide penetrating peptides Arginine-Rich Cell-Penetrating Peptides: Mechanisms and Applications in Intracellular Delivery

Polyargininepeptide Arginine-rich cell-penetrating peptides (CPPs) are a class of short cationic peptides that possess the remarkable ability to traverse the plasma membranes of eukaryotic cells, thereby facilitating the intracellular delivery of various molecules. This unique property makes them highly valuable tools in drug delivery and molecular biology research. While often described as directly passing through lipid membranes, emerging research suggests that arginine-rich CPPs may instead enter cells via passive uptake into vesicles or by inducing changes in membrane structure, such as fluidization. Understanding these internalization mechanisms is crucial for optimizing their use as carriers.

Understanding the Mechanisms of Cellular Uptake

The precise mechanisms by which arginine-rich CPPs enter cells are a subject of ongoing investigation. Early models proposed direct translocation across the lipid bilayer.作者：I Nakase·2023—Arginine-rich cell-penetrating peptides (CPPs) such as HIV-1Tat(48–60) and oligoarginines have been widely used as carriers of intracellular delivery of ... However, more recent studies indicate that these peptides might interact with the cell membrane in complex ways. For instance, the guanidino groups of arginine residues are known to form hydrogen bonds, which can influence peptide-cell interactions.Neuroprotective peptides fused to arginine-rich cell ... Some research suggests that arginine-rich CPPs can modulate membrane heterogeneity and fluidization, potentially leading to their internalization. Furthermore, studies have shown that these peptides do not always enter cells by directly piercing the membrane but can be taken up through endocytic pathways or by inducing membrane pores. The structural rigidity of the peptide also appears to play a role, with increased rigidity correlating with enhanced transduction efficiency.

Key Characteristics and Examples of Arginine-Rich CPPs

Arginine-rich CPPs are characterized by a high proportion of arginine residues, which confer a strong positive charge. This cationic nature is fundamental to their interaction with the negatively charged components of cell membranes. Examples of well-studied arginine-rich CPPs include those derived from the HIV-1 Tat protein (such as Tat(48-60)) and various oligoarginines. These peptides have been instrumental in demonstrating the potential of CPPs for delivering a wide range of cargo molecules, including proteins, nucleic acids, and small drugs, into cells that would otherwise be impermeable to them. Cationic arginine-rich peptides (CARPs) represent another category, some of which have demonstrated intrinsic neuroprotective properties.

Applications in Intracellular Delivery and Drug Development

The ability of arginine-rich CPPs to efficiently deliver molecules into cells has opened up significant avenues for therapeutic development. They serve as versatile carriers for a variety of payloads, enabling the delivery of macromolecules that cannot cross the plasma membrane on their own. This capability is particularly important for delivering drugs to intracellular targets, such as the nucleus or cytoplasm, where therapeutic effects can be maximizedArginine-Rich Cell-Penetrating Peptides Induce Lipid .... Research has explored conjugating CPPs to therapeutic agents to improve their bioavailability and cellular uptake. While promising, the efficiency of uptake can be influenced by various factors, including the nature of the cargo molecule.Cell-Surface Interactions on Arginine-Rich Cell-Penetrating ... For example, fusing cargo peptides to arginine-rich CPPs can sometimes reduce uptake efficiency or alter cellular distribution patterns.

Future Directions and Considerations

Ongoing research continues to refine our understanding of arginine-rich CPPs, focusing on optimizing their design for enhanced delivery efficiency and reduced toxicity. Factors such as peptide sequence, length, structural rigidity, and the nature of the conjugated cargo are being investigated to improve their performance作者：N Schmidt·2010·被引用次数：648—Arginine-rich cell-penetrating peptidesare short cationic peptides capable of traversing the plasma membranes of eukaryotic cells.. The development of novel arginine-rich CPPs and strategies for their application in targeted drug delivery holds significant promise for addressing unmet medical needs across various diseases. As our knowledge of their complex interactions with cellular membranes grows, so too will their utility in advancing biomedical research and therapeutic interventions.