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Mai LD, Wimberley SC, Champion JA. Intracellular delivery strategies using membrane-interacting peptides and proteins. NANOSCALE 2024; 16:15465-15480. [PMID: 39091235 PMCID: PMC11340348 DOI: 10.1039/d4nr02093f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2024] [Accepted: 07/22/2024] [Indexed: 08/04/2024]
Abstract
While the cellular cytosol and organelles contain attractive targets for disease treatments, it remains a challenge to deliver therapeutic biomacromolecules to these sites. This is due to the selective permeability of the plasma and endosomal membranes, especially for large and hydrophilic therapeutic cargos such as proteins and nucleic acids. In response, many different delivery systems and molecules have been devised to help therapeutics cross these barriers to reach cytosolic targets. Among them are peptide and protein-based systems, which have several advantages over other natural and synthetic materials including their ability to interact with cell membranes. In this review, we will describe recent advances and current challenges of peptide and protein strategies that leverage cell membrane association and modulation to enable cytosolic delivery of biomacromolecule cargo. The approaches covered here include peptides and proteins derived from or inspired by natural sequences as well as those designed de novo for delivery function.
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Affiliation(s)
- Linh D Mai
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 950 Atlantic Dr NW, Atlanta, GA, 30332-2000, USA.
| | - Sydney C Wimberley
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 950 Atlantic Dr NW, Atlanta, GA, 30332-2000, USA.
- BioEngineering Program, Georgia Institute of Technology, USA
| | - Julie A Champion
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 950 Atlantic Dr NW, Atlanta, GA, 30332-2000, USA.
- BioEngineering Program, Georgia Institute of Technology, USA
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2
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Harris ES, McIntire HJ, Mazur M, Schulz-Hildebrandt H, Leung HM, Tearney GJ, Krick S, Rowe SM, Barnes JW. Reduced sialylation of airway mucin impairs mucus transport by altering the biophysical properties of mucin. Sci Rep 2024; 14:16568. [PMID: 39019950 PMCID: PMC11255327 DOI: 10.1038/s41598-024-66510-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2024] [Accepted: 07/02/2024] [Indexed: 07/19/2024] Open
Abstract
Mucus stasis is a pathologic hallmark of muco-obstructive diseases, including cystic fibrosis (CF). Mucins, the principal component of mucus, are extensively modified with hydroxyl (O)-linked glycans, which are largely terminated by sialic acid. Sialic acid is a negatively charged monosaccharide and contributes to the biochemical/biophysical properties of mucins. Reports suggest that mucin sialylation may be altered in CF; however, the consequences of reduced sialylation on mucus clearance have not been fully determined. Here, we investigated the consequences of reduced sialylation on the charge state and conformation of the most prominent airway mucin, MUC5B, and defined the functional consequences of reduced sialylation on mucociliary transport (MCT). Reduced sialylation contributed to a lower charged MUC5B form and decreased polymer expansion. The inhibition of total mucin sialylation de novo impaired MCT in primary human bronchial epithelial cells and rat airways, and specific α-2,3 sialylation blockade was sufficient to recapitulate these findings. Finally, we show that ST3 beta-galactoside alpha-2,3-sialyltransferase (ST3Gal1) expression is downregulated in CF and partially restored by correcting CFTR via Elexacaftor/Tezacaftor/Ivacaftor treatment. Overall, this study demonstrates the importance of mucin sialylation in mucus clearance and identifies decreased sialylation by ST3Gal1 as a possible therapeutic target in CF and potentially other muco-obstructive diseases.
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Affiliation(s)
- Elex S Harris
- Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham, 1900 University Blvd. Tinsley Harrison Tower, Suite 422, Birmingham, AL, 35294, USA
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Hannah J McIntire
- Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham, 1900 University Blvd. Tinsley Harrison Tower, Suite 422, Birmingham, AL, 35294, USA
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Marina Mazur
- Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham, 1900 University Blvd. Tinsley Harrison Tower, Suite 422, Birmingham, AL, 35294, USA
| | | | - Hui Min Leung
- Massachusetts General Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
| | - Guillermo J Tearney
- Massachusetts General Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
| | - Stefanie Krick
- Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham, 1900 University Blvd. Tinsley Harrison Tower, Suite 422, Birmingham, AL, 35294, USA
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Steven M Rowe
- Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham, 1900 University Blvd. Tinsley Harrison Tower, Suite 422, Birmingham, AL, 35294, USA.
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA.
- Departments of Pediatrics and Cell Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL, USA.
| | - Jarrod W Barnes
- Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham, 1900 University Blvd. Tinsley Harrison Tower, Suite 422, Birmingham, AL, 35294, USA.
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA.
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3
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Harris ES, McIntire HJ, Mazur M, Schulz-Hildebrandt H, Leung HM, Tearney GJ, Krick S, Rowe SM, Barnes JW. Reduced Sialylation of Airway Mucin Impairs Mucus Transport by Altering the Biophysical Properties of Mucin. RESEARCH SQUARE 2024:rs.3.rs-4421613. [PMID: 38853971 PMCID: PMC11160914 DOI: 10.21203/rs.3.rs-4421613/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
Mucus stasis is a pathologic hallmark of muco-obstructive diseases, including cystic fibrosis (CF). Mucins, the principal component of mucus, are extensively modified with hydroxyl (O)-linked glycans, which are largely terminated by sialic acid. Sialic acid is a negatively charged monosaccharide and contributes to the biochemical/biophysical properties of mucins. Reports suggest that mucin sialylation may be altered in CF; however, the consequences of reduced sialylation on mucus clearance have not been fully determined. Here, we investigated the consequences of reduced sialylation on the charge state and conformation of the most prominent airway mucin, MUC5B, and defined the functional consequences of reduced sialylation on mucociliary transport (MCT). Reduced sialylation contributed to a lower charged MUC5B form and decreased polymer expansion. The inhibition of total mucin sialylation de novo impaired MCT in primary human bronchial epithelial cells and rat airways, and specific α-2,3 sialylation blockade was sufficient to recapitulate these findings. Finally, we show that ST3 beta-galactoside alpha-2,3-sialyltransferase (ST3Gal1) expression is downregulated in CF and partially restored by correcting CFTR via Elexacaftor/Tezacaftor/Ivacaftor treatment. Overall, this study demonstrates the importance of mucin sialylation in mucus clearance and identifies decreased sialylation by ST3Gal1 as a possible therapeutic target in CF and potentially other muco-obstructive diseases.
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Affiliation(s)
- Elex S Harris
- Gregory Fleming James Cystic Fibrosis Research Center, Univ. of Alabama at Birmingham, Birmingham, AL, USA
| | - Hannah J McIntire
- Gregory Fleming James Cystic Fibrosis Research Center, Univ. of Alabama at Birmingham, Birmingham, AL, USA
| | - Marina Mazur
- Gregory Fleming James Cystic Fibrosis Research Center, Univ. of Alabama at Birmingham, Birmingham, AL, USA
| | | | | | | | - Stefanie Krick
- Gregory Fleming James Cystic Fibrosis Research Center, Univ. of Alabama at Birmingham, Birmingham, AL, USA
| | - Steven M Rowe
- Gregory Fleming James Cystic Fibrosis Research Center, Univ. of Alabama at Birmingham, Birmingham, AL, USA
| | - Jarrod W Barnes
- Gregory Fleming James Cystic Fibrosis Research Center, Univ. of Alabama at Birmingham, Birmingham, AL, USA
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4
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Yang P, Mao W, Zhang J, Yang Y, Zhang F, Ouyang X, Li B, Wu X, Ba Z, Ran K, Tian Y, Liu H, Zhang Y, Gou S, Zhong C, Ni J. A novel antimicrobial peptide with broad-spectrum and exceptional stability derived from the natural peptide Brevicidine. Eur J Med Chem 2024; 269:116337. [PMID: 38537511 DOI: 10.1016/j.ejmech.2024.116337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 03/01/2024] [Accepted: 03/14/2024] [Indexed: 04/07/2024]
Abstract
The global issue of antibiotic resistance is increasingly severe, highlighting the urgent necessity for the development of new antibiotics. Brevicidine, a natural cyclic lipopeptide, exhibits remarkable antimicrobial activity against Gram-negative bacteria. In this study, a comprehensive structure-activity relationship of Brevicidine was investigated through 20 newly synthesized cyclic lipopeptide analogs, resulting in the identification of an optimal linear analog 22. The sequence of analog 22 consisted of five d-amino acids and four non-natural amino acid 2,5-diaminovaleric acid (Orn) and conjugated with decanoic acid at N-terminal. Compared to Brevicidine, analog 22 was easier to synthesize, and exerted broad spectrum antimicrobial activity and excellent stability (t1/2 = 40.98 h). Additionally, analog 22 demonstrated a rapid bactericidal effect by permeating non-specifically through the bacterial membranes, thereby minimizing the likelihood of inducing resistance. Moreover, it exhibited remarkable efficacy in combating bacterial biofilms and reversing bacterial resistance to conventional antibiotics. Furthermore, it effectively suppressed the growth of bacteria in vital organs of mice infected with S. aureus ATCC 25923. In conclusion, analog 22 may represent a potential antimicrobial peptide for further optimization.
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Affiliation(s)
- Ping Yang
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China
| | - Wenbo Mao
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China
| | - Jingying Zhang
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China
| | - Yinyin Yang
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China
| | - Fangyan Zhang
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China
| | - Xu Ouyang
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China
| | - Beibei Li
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China
| | - Xiaoyan Wu
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China
| | - Zufang Ba
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China
| | - Kaixin Ran
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China
| | - Yali Tian
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China
| | - Hui Liu
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China; State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, PR China
| | - Yun Zhang
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China; State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, PR China
| | - Sanhu Gou
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China; State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, PR China
| | - Chao Zhong
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China; State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, PR China.
| | - Jingman Ni
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou, 730000, PR China; State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, PR China.
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Ahmadi M, Ritter CA, von Woedtke T, Bekeschus S, Wende K. Package delivered: folate receptor-mediated transporters in cancer therapy and diagnosis. Chem Sci 2024; 15:1966-2006. [PMID: 38332833 PMCID: PMC10848714 DOI: 10.1039/d3sc05539f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Accepted: 12/31/2023] [Indexed: 02/10/2024] Open
Abstract
Neoplasias pose a significant threat to aging society, underscoring the urgent need to overcome the limitations of traditional chemotherapy through pioneering strategies. Targeted drug delivery is an evolving frontier in cancer therapy, aiming to enhance treatment efficacy while mitigating undesirable side effects. One promising avenue utilizes cell membrane receptors like the folate receptor to guide drug transporters precisely to malignant cells. Based on the cellular folate receptor as a cancer cell hallmark, targeted nanocarriers and small molecule-drug conjugates have been developed that comprise different (bio) chemistries and/or mechanical properties with individual advantages and challenges. Such modern folic acid-conjugated stimuli-responsive drug transporters provide systemic drug delivery and controlled release, enabling reduced dosages, circumvention of drug resistance, and diminished adverse effects. Since the drug transporters' structure-based de novo design is increasingly relevant for precision cancer remediation and diagnosis, this review seeks to collect and debate the recent approaches to deliver therapeutics or diagnostics based on folic acid conjugated Trojan Horses and to facilitate the understanding of the relevant chemistry and biochemical pathways. Focusing exemplarily on brain and breast cancer, recent advances spanning 2017 to 2023 in conjugated nanocarriers and small molecule drug conjugates were considered, evaluating the chemical and biological aspects in order to improve accessibility to the field and to bridge chemical and biomedical points of view ultimately guiding future research in FR-targeted cancer therapy and diagnosis.
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Affiliation(s)
- Mohsen Ahmadi
- Leibniz Institute for Plasma Science and Technology (INP), Center for Innovation Competence (ZIK) Plasmatis Felix Hausdorff-Str. 2 17489 Greifswald Germany
| | - Christoph A Ritter
- Institute of Pharmacy, Section Clinical Pharmacy, University of Greifswald Greifswald Germany
| | - Thomas von Woedtke
- Leibniz Institute for Plasma Science and Technology (INP), Center for Innovation Competence (ZIK) Plasmatis Felix Hausdorff-Str. 2 17489 Greifswald Germany
- Institute for Hygiene and Environmental Medicine, Greifswald University Medical Center Ferdinand-Sauerbruch-Straße 17475 Greifswald Germany
| | - Sander Bekeschus
- Leibniz Institute for Plasma Science and Technology (INP), Center for Innovation Competence (ZIK) Plasmatis Felix Hausdorff-Str. 2 17489 Greifswald Germany
- Clinic and Policlinic for Dermatology and Venereology, Rostock University Medical Center Strempelstr. 13 18057 Rostock Germany
| | - Kristian Wende
- Leibniz Institute for Plasma Science and Technology (INP), Center for Innovation Competence (ZIK) Plasmatis Felix Hausdorff-Str. 2 17489 Greifswald Germany
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Uddin N, Binzel DW, Shu D, Fu TM, Guo P. Targeted delivery of RNAi to cancer cells using RNA-ligand displaying exosome. Acta Pharm Sin B 2023; 13:1383-1399. [PMID: 37139430 PMCID: PMC10149909 DOI: 10.1016/j.apsb.2022.11.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 09/27/2022] [Accepted: 10/13/2022] [Indexed: 11/18/2022] Open
Abstract
Exosome is an excellent vesicle for in vivo delivery of therapeutics, including RNAi and chemical drugs. The extremely high efficiency in cancer regression can partly be attributed to its fusion mechanism in delivering therapeutics to cytosol without endosome trapping. However, being composed of a lipid-bilayer membrane without specific recognition capacity for aimed-cells, the entry into nonspecific cells can lead to potential side-effects and toxicity. Applying engineering approaches for targeting-capacity to deliver therapeutics to specific cells is desirable. Techniques with chemical modification in vitro and genetic engineering in cells have been reported to decorate exosomes with targeting ligands. RNA nanoparticles have been used to harbor tumor-specific ligands displayed on exosome surface. The negative charge reduces nonspecific binding to vital cells with negatively charged lipid-membrane due to the electrostatic repulsion, thus lowering the side-effect and toxicity. In this review, we focus on the uniqueness of RNA nanoparticles for exosome surface display of chemical ligands, small peptides or RNA aptamers, for specific cancer targeting to deliver anticancer therapeutics, highlighting recent advances in targeted delivery of siRNA and miRNA that overcomes the previous RNAi delivery roadblocks. Proper understanding of exosome engineering with RNA nanotechnology promises efficient therapies for a wide range of cancer subtypes.
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Affiliation(s)
- Nasir Uddin
- Center for RNA Nanobiotechnology and Nanomedicine, Division of Pharmaceutics and Pharmacology, College of Pharmacy, the Ohio State University, Columbus, OH 43210, USA
- Dorothy M. Davis Heart and Lung Research Institute, the Ohio State University, Columbus, OH 43210, USA
- James Comprehensive Cancer Center, College of Medicine, the Ohio State University, Columbus, OH 43210, USA
| | - Daniel W. Binzel
- Center for RNA Nanobiotechnology and Nanomedicine, Division of Pharmaceutics and Pharmacology, College of Pharmacy, the Ohio State University, Columbus, OH 43210, USA
- Dorothy M. Davis Heart and Lung Research Institute, the Ohio State University, Columbus, OH 43210, USA
- James Comprehensive Cancer Center, College of Medicine, the Ohio State University, Columbus, OH 43210, USA
| | - Dan Shu
- Center for RNA Nanobiotechnology and Nanomedicine, Division of Pharmaceutics and Pharmacology, College of Pharmacy, the Ohio State University, Columbus, OH 43210, USA
- Dorothy M. Davis Heart and Lung Research Institute, the Ohio State University, Columbus, OH 43210, USA
- James Comprehensive Cancer Center, College of Medicine, the Ohio State University, Columbus, OH 43210, USA
| | - Tian-Min Fu
- Department of Biological Chemistry & Pharmacology, College of Medicine, the Ohio State University, Columbus, OH 43210, USA
| | - Peixuan Guo
- Center for RNA Nanobiotechnology and Nanomedicine, Division of Pharmaceutics and Pharmacology, College of Pharmacy, the Ohio State University, Columbus, OH 43210, USA
- Dorothy M. Davis Heart and Lung Research Institute, the Ohio State University, Columbus, OH 43210, USA
- James Comprehensive Cancer Center, College of Medicine, the Ohio State University, Columbus, OH 43210, USA
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Effect of hydrophobic moment on membrane interaction and cell penetration of apolipoprotein E-derived arginine-rich amphipathic α-helical peptides. Sci Rep 2022; 12:4959. [PMID: 35322082 PMCID: PMC8943082 DOI: 10.1038/s41598-022-08876-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Accepted: 03/14/2022] [Indexed: 12/15/2022] Open
Abstract
We previously developed an amphipathic arginine-rich peptide, A2-17, which has high ability to directly penetrate across cell membranes. To understand the mechanism of the efficient cell-penetrating ability of the A2-17 peptide, we designed three structural isomers of A2-17 having different values of the hydrophobic moment and compared their membrane interaction and direct cell penetration. Confocal fluorescence microscopy revealed that cell penetration efficiency of peptides tends to increase with their hydrophobic moment, in which A2-17 L14R/R15L, an A2-17 isomer with the highest hydrophobic moment, predominantly remains on plasma cell membranes. Consistently, Trp fluorescence analysis indicated the deepest insertion of A2-17 L14R/R15L into lipid membranes among all A2-17 isomers. Electrophysiological analysis showed that the duration and charge flux of peptide-induced pores in lipid membranes were prominent for A2-17 L14R/R15L, indicating the formation of stable membrane pores. Indeed, the A2-17 L14R/R15L peptide exhibited the strongest membrane damage to CHO-K1 cells. Atomic force microscopy quantitatively defined the peptide-induced membrane perturbation as the decrease in the stiffness of lipid vesicles, which was correlated with the hydrophobic moment of all A2-17 isomers. These results indicate that optimal membrane perturbation by amphipathic A2-17 peptide is critical for its efficient penetration into cells without inducing stabilized membrane pores.
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