Cell penetrating peptidestructure The cell penetrating peptide TAT, derived from the transactivator of transcription (TAT) protein of the human immunodeficiency virus (HIV), is a prominent example of cell-penetrating peptides (CPPs). These short peptides are renowned for their remarkable ability to facilitate the cellular uptake of various molecules, ranging from small chemical compounds to larger entities like proteins and nanoparticles, across cell membranes without causing significant damage. The TAT peptide, specifically, has been extensively studied for its potential in drug delivery systems and therapeutic applications due to its inherent capacity to translocate into cells.
The TAT peptide, often represented by the sequence GRKKRRQRRRPQ, is a cationic peptide characterized by its arginine-rich nature. This structural feature is crucial for its cell-penetrating capabilities. Unlike conventional methods of drug delivery that often struggle with membrane permeability, the TAT peptide acts as a shuttle, enabling the transport of attached or conjugated molecules into the cell's interior, including the cytosol and nucleus. This direct internalization mechanism bypasses many cellular barriers, making it a valuable tool in biomedical research and development.
While the exact mechanisms by which cell-penetrating peptides like TAT mediate cellular uptake are still under investigation, several models have been proposed.作者：A Mishra·2011·被引用次数：404—Cell-penetrating peptides (CPPs), such as the HIV TAT peptide,are able to translocate across cellular membranes efficiently. A number of mechanisms, ... These include direct membrane translocation, endocytosis pathways, and pore formation. The TAT peptide's ability to penetrate cell membranes has been attributed to its positive charge, which interacts with the negatively charged components of the cell membrane作者：A Ziegler·2005·被引用次数：347—Cell-penetrating peptides(CPPs) are cationic peptides which, when linked to genes, proteins, or nanoparticles, facilitate the transport of these entities .... Studies suggest that the TAT peptide can not only passively penetrate membranes but also, in some instances, induce transient pore formation, facilitating the passage of cargo.2024年2月7日—TAT peptidesare short sequences derived from theTATprotein of HIV-1, capable ofpenetrating cellularmembranes to deliver cargo molecules into cells. The efficiency of internalization can also be influenced by factors such as peptide concentration, cell type, and the presence of specific modifications or cargo molecules.
The primary utility of the cell penetrating peptide TAT lies in its role as a delivery vehicle.作者：H Kim·2015·被引用次数：22—1Latner Thoracic Surgery Research Laboratories, Toronto General Research Institute University Health Network, Toronto, Ontario, Canada. Researchers have explored its use in delivering a wide array of therapeutic agents, including nucleic acids (DNA, RNA), proteins, and even imaging agents. For instance, the TAT-HA fusion protein has demonstrated the delivery of proteins into cells, targeting specific intracellular compartments作者：GA Eggimann·2013·被引用次数：35—Cell penetrating peptides (CPP) arepeptides of 10 to 30 residues derived from natural translocating proteins. Multivalency is known to enhance cellular .... Its application extends to enhancing the internalization of inhibitors, such as PSD-95 inhibitors, into challenging cellular environments like blood-brain barrier endothelial cells.作者：SG Patel·2019·被引用次数：304—The peptide was introduced between eGFP and TAT;TAT-HA has been shown to deliver proteins into cells, specifically the cytosol and nucleus. Furthermore, modified TAT peptides, like TMR-TAT, have been investigated for their potential as photosensitizers, capable of destroying membranes upon light exposure and escaping endosomes.
The inherent properties of the TAT peptide can be further optimized through various design and modification strategies to enhance its efficiency, specificity, and safety. Researchers investigate different peptide sequences, lengths, and modifications to improve cellular uptake efficiency, reduce potential toxicity, and target specific cell types or tissues. The development of TAT-HA, for example, illustrates how fusing the TAT sequence to other proteins can enable the delivery of larger biomolecules. The field also explores the creation of CPP databases and design tools to aid in the rational design of novel CPPs with tailored properties for specific applications作者：H Zhang·2023·被引用次数：46—The first syntheticCPPthat was developed, theTATpeptide, was derived from the human immunodeficiency virus in 1988 [7,8]. Thereafter, the number of reported ....
Despite its promise, the use of the cell penetrating peptide TAT and other CPPs faces challenges. These include potential immunogenicity, limited intracellular trafficking control, and the need for rigorous safety and efficacy evaluations for therapeutic applications作者：A Mishra·2011·被引用次数：404—Cell-penetrating peptides (CPPs), such as the HIV TAT peptide,are able to translocate across cellular membranes efficiently. A number of mechanisms, .... Understanding the precise mechanisms of uptake and intracellular fate remains an active area of research.作者：D Srinivasan·2011·被引用次数：54—We report thatTMR-TAT acts as a photosensitizer that can destroy membranes. TMR-TAT escapes from endosomes after exposure to moderate light doses. Future directions involve developing more sophisticated CPP designs, exploring novel drug conjugation strategies, and conducting comprehensive preclinical and clinical studies to translate the potential of TAT peptides into viable therapeutic and diagnostic agentsTranslocation of HIV TAT peptide and analogues induced .... The ongoing research into cell-penetrating peptides, with TAT as a foundational example, continues to push the boundaries of targeted drug delivery and molecular transport across cellular barriers.
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