phlip peptide pH low insertion peptide (pHLIP - vitamin-c-vs-copper-peptides targets solid tumors The pH-Low Insertion Peptide (pHLIP): A pH-Responsive Biomolecule with Diverse Applications

vitawell-collagen-marine-peptides The pH-Low Insertion Peptide (pHLIP), also referred to as pH (low) insertion peptides (pHLIPs) or pHLIP s (pH-Low Insertion Peptides), is a fascinating class of peptides that exhibit remarkable pH-dependent behavior. These linear peptides that sense cell-surface pH are characterized by their ability to insert across cell membranes and form transmembrane helices specifically under acidic conditions. This unique property makes pHLIP a valuable tool in various biomedical research and therapeutic applications, particularly in targeting diseased tissues that often display an acidic microenvironment.pH-Low Insertion Peptide (pHLIP) 是一种短的，pH 响应肽，能够在酸性pH 下插入细胞膜形成跨膜螺旋。pH-Low Insertion Peptide 以高特异性靶向肿瘤早期和转移阶段的酸性肿瘤 ...

Understanding pHLIP's Mechanism of Action

At physiological pH (around 7.pH-Low Insertion Peptide (pHLIP) 是一种短的，pH 响应肽，能够在酸性pH 下插入细胞膜形成跨膜螺旋。pH-Low Insertion Peptide 以高特异性靶向肿瘤早期和转移阶段的酸性肿瘤 ...4), pHLIP typically exists in an unstructured state in solutionpHLIP, a peptide discovered in the Engelman lab, has .... However, when exposed to acidic pH, such as that found on the surface of cancer cells due to the Warburg effect, the peptide undergoes a conformational change. It transforms from an unstructured coil on the membrane surface at pH > 7 into a transmembrane helix, effectively inserting itself across the lipid bilayer. This pH-driven insertion is a key feature that researchers leverage for targeted delivery. The pH-Low Insertion Peptide (pHLIP) can assume three different stable states, reflecting its dynamic nature in response to pH changes.

The precise mechanism involves protonation of carboxyl groups within the peptide at lower pH, which facilitates its interaction with and insertion into the cell membrane. Research has shown that pHLIP binds to a membrane at pH 7作者：LC Wyatt·2018·被引用次数：140—ThepH (low) insertion peptides (pHLIPs) target acidity at the surfaces of cancer cells and show utility in a wide range of applications, ....4 unstructured but folds across the bilayer as a transmembrane helix at pH ~6. This pH-selective behavior is crucial for its targeted action.2022年10月6日—ThepHLIP(pH-Low InsertionPeptide) molecule is one of sevenpeptidehelices bound together in the bacteriorhodopsin membrane protein. The pH-dependent membrane inserting peptides, like pHLIP, have the potential to target diseased tissues by exploiting the differences in pH between healthy and diseased cellspHLIP（pH low insertion peptide）.

pHLIP's Composition and Characteristics

pHLIP is generally described as a moderately hydrophobic peptide, typically ranging from 25 to 35 amino acids in length. One specific variant, a peptide of 37 amino acids, has also been studied. The peptide's structure is composed of distinct regions, including an N-terminus carrying a positive charge from amino acids and other functional groups. The sequence of pHLIP peptide is engineered to optimize its pH-sensing and membrane-inserting capabilities.Decoration of Nanovesicles with pH (Low) Insertion Peptide ... For instance, Using pHLIP Var3, we show its ability to detect cancer with a notable low false-positive rate in preclinical modelsThepHLIPtechnology, which targets the acidic tumor microenvironment, represents an innovative approach to the delivery of small RNAs to pancreatic ductal ....

Applications in Disease Targeting and Therapy

The primary advantage of pHLIP lies in its ability to target the low pH (or high acidity) at the surfaces of cells in various pathological conditions, most notably cancer. This makes it a powerful technology for targeting solid tumors and potentially targeting cancer cells and metastases for tumor diagnosis, imaging, and therapypHLIPis a proprietary pH-Low InsertionPeptidePlatform Technology for targeted delivery of therapeutics to acidic cells in diseased tissues.. The acidic tumor microenvironment, a hallmark of many cancers, provides a specific niche for pHLIP to exert its function.作者：LC Wyatt·2017·被引用次数：134—The pHLIP technologymay prove useful in targeting cancer cells and metastasesfor tumor diagnosis, imaging, and therapy.

pHLIP can be utilized as a carrier for targeted drug delivery. By conjugating therapeutic agents or imaging probes to pHLIP, researchers can ensure that these payloads are delivered preferentially to acidic tissues. This approach uses the low pH (or high acidity) at the surfaces of cells to concentrate treatments where they are most needed, potentially reducing systemic toxicityThe Engelman Lab and colleagues are pursuing applications of the novelpH-responsive transmembrane peptides, pHLIPs, for translational and basic research.. For example, pHLIP has been explored for the targeted delivery of small RNAs to pancreatic ductal adenocarcinoma.

Furthermore, pHLIP can be decorated onto nanovesicles, creating pH low insertion peptide (pHLIP)-decorated polymeric nanocarriers. These decorated nanovesicles can sense pH at the surface of cancer cells and insert into the membrane of targeted cells, bringing nanomaterials to close proximity of the cell. This enhances the efficacy of drug delivery and imaging. Studies have also investigated the pH-Selective Cytotoxicity of pHLIP-Antimicrobial Peptide conjugates, demonstrating their ability to selectively induce concentration- and pH-dependent toxicity in cancer cells.

Beyond cancer, the pHLIP technology may prove useful in targeting cancer cells and metastases and other diseased tissues where altered pH is a characteristic feature2022年10月6日—ThepHLIP(pH-Low InsertionPeptide) molecule is one of sevenpeptidehelices bound together in the bacteriorhodopsin membrane protein.. The peptide's ability to insert across membranes at low pH has also been explored for other applications, such as facilitating the translocation of cell-impermeable moleculesCy5.5-labeled pH low insertion peptide (pHLIP) - NCBI. For instance, pH-(low)-insertion-peptide (pHLIP) translocation of phalloidin, a cell-impermeable polar toxin, has been shown to inhibit cancer cell proliferation.pHLIPs arelinear peptides that sense cell-surface pH. They are moderately hydrophobic 25-35 aa peptides containing protonatable carboxyl groups. At normal pH, ...

Future Directions and Research

The pHLIP platform technology is a proprietary innovation for targeted delivery to acidic cells in diseased tissues. Ongoing research continues to explore its potential in basic and translational science. The biophysical chemistry of pH-driven membrane insertion by pHLIP serves as a valuable model for understanding fundamental biological processes.The sequence of pHLIP peptide. Researchers are also developing more sophisticated pHLIP models, including increasing the realism of in silico pHLIP peptide models, to further optimize its performance.作者：M Zoonens·2008·被引用次数：109—The pH-dependent insertion ofpHLIPacross membranes is proving to be a useful property for targeting acidic tissues or tumors and delivering drugs attached to ... The pHLIP family comprises a tumor-agnostic technology that exploits the unique pH characteristics of diseased cellular environments, paving the way for novel diagnostic and therapeutic strategies.Bilayer Interactions of pHLIP, a Peptide that Can Deliver ... The peptide's inherent properties, such as its high affinities for cellular membranes at normal pH that transition to membrane insertion at low pH, underscore its versatility and promise.作者：YK Reshetnyak·2024·被引用次数：6—The family of pH (Low) Insertion Peptides (pHLIP) comprises a tumor-agnostic technology thatuses the low pH (or high acidity) at the surfaces of cells...