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- •PEGylated Nanocarriers in Medicine and Pharmacy
- •Preface
- •Contents
- •Editors and Contributors
- •About the Editors
- •Contributors
- •1.1.3.1 Passive Targeting Agent
- •1.1.3.2 Solubility Enhancers
- •1. PEGylated Pharmaceutical Nanocarriers
- •1.1 PEGylation
- •1.1.1 PEG Characteristics
- •1.2 PEGylation Determination
- •1.2.2.1 Thermal Gravimetric Analysis (TGA)
- •1.2.2.2 Nuclear Magnetic Resonance (NMR)
- •1.2.2.4 X-Ray Photoelectron Spectroscopy
- •1.3.1 Nanoparticulate System
- •1.3.1.1 Solid Lipid Nanoparticles
- •1.3.1.2 Nanostructured Lipid Carriers (NLCs)
- •1.3.1.3 Polymeric Nanoparticles
- •1.3.2 Metal Nanoparticles
- •1.3.2.1 Silver Nanoparticles
- •1.3.2.2 Gold Nanoparticles
- •1.3.2.3 Titanium Dioxide Nanoparticles
- •1.3.2.4 Copper Nanoparticles
- •1.3.3 Vesicular Systems
- •1.3.3.1 Liposomes
- •1.3.3.2 Niosomes
- •1.3.3.3 Ethosomes
- •1.4.1 Cancer
- •1.4.2 Gene Delivery
- •1.4.3 Diagnostics Imaging
- •1.4.4 Vaccines
- •1.4.5 Rheumatoid Arthritis
- •1.4.6 Hemophilia
- •1.4.7 Pain Therapy
- •1.4.8 Diabetes
- •1.4.9 Others
- •1.6 Conclusion
- •References
- •2.1 Introduction
- •Nanoprecipitation (Solvent Diffusion)
- •Emulsification (Solvent Evaporation or Nanoemulsion)
- •Physical Adsorption Strategy
- •2.2.2.1 Pre-Insertion PEGylation
- •2.2.2.2 Post-Insertion PEGylation
- •2.3.1 Indirect Assessment (Qualitative Assessment)
- •2.3.1.1 Particle Size
- •2.3.1.2 Zeta Potential
- •2.3.1.3 Surface Hydrophilicity
- •2.3.1.4 Microscopic Techniques
- •2.3.1.5 Fourier Transform-Infrared Spectroscopy (FT-IR)
- •2.3.2 Direct Assessment (Quantitative Assessment)
- •2.3.2.1 Colorimetric Methods
- •2.3.2.2 Chromatographic Methods
- •2.3.2.4 Nuclear Magnetic Resonance (NMR)
- •2.3.2.5 X-Ray Photoelectron Spectroscopy (XPS)
- •References
- •3.1 Introduction
- •3.2 Characterization Techniques
- •3.3 Infrared Spectroscopy
- •3.4 Raman Spectroscopy
- •3.5 X-Ray Photoelectron Spectroscopy
- •3.6 Nuclear Magnetic Resonance
- •3.7 Energy-Dispersive X-Ray Spectroscopy
- •3.8 Mass Spectroscopy (MS)
- •3.9 Thermogravimetric Analysis
- •3.10 Differential Scanning Calorimetry
- •3.11 Atomic Force Microscopy
- •3.12 Scanning Electron Microscopy
- •3.13 Transmission Electron Microscopy
- •3.14 Conclusion
- •References
- •4.1 Introduction
- •4.3.1 Nanoparticles PEGylation
- •4.3.2 Polyplexes (PP) PEGylation
- •4.5.1 Systemic Drug Delivery
- •4.5.2 Nonsystemic Drug Delivery
- •4.5.2.3 PEGylated Intravaginal Nanocarriers
- •4.5.2.6 Vaccines Entrapped PEGylated Nanocarriers
- •4.6.2 PEG Molecular Weight (MW)
- •4.7 PEGylated Nanocarriers Products
- •4.8.3 Disadvantageous Physicochemical Properties
- •4.8.5 Limited RES Evasion Capacity
- •4.9 Conclusion
- •References
- •5.1 Introduction
- •5.1.2 PEG Solubility Characteristics
- •5.2 Water-Soluble PEGylated Small Molecule Drugs
- •5.3 Soluble PEGylated Proteins/Enzymes
- •5.3.2 Organic Solvent–Soluble PEGylated Proteins/Enzymes
- •5.4 Water-Soluble PEGylated Drug Nanocarriers
- •5.4.1 Water-Soluble PEGylated Silicon Nanocarriers
- •5.4.2 Water-Soluble PEGylated Carbon Nanotubes
- •5.4.4 Water-Soluble PEGylated Dendrimers
- •5.4.5 Water-Soluble PEGylated Polymeric Micelles
- •5.5 Hydrated or Hydrophilic PEGylated Drug Nanocarriers
- •5.5.1 Hydrated PEGylated Lipid Nanocarriers
- •5.5.2 Hydrophilic PEG-Coated Zein Nanocarriers
- •References
- •5.6.4.1 PEG Chain Length/Molecular Weight
- •6.1 Introduction
- •Increased Solubility
- •Improved Stability
- •Reduced Immunogenicity
- •Enhanced Circulation Time
- •Heterogeneity
- •6.3.1 Enhancing Immune Responses
- •6.3.2 Suppressing Immune Responses
- •6.3.3 Immune Evasion
- •6.4.1 Strategies to Overcome Immunological Barriers
- •6.4.1.1 PEGylation
- •6.4.1.2 Cell Membranes
- •6.4.1.3 Carbohydrates
- •6.4.1.4 Proteins
- •6.6.1 Cancer Therapy
- •6.6.2 Gene Therapy
- •6.6.3 Immunotherapy
- •6.6.4 Central Nervous System (CNS) Drug Delivery
- •6.6.5 Pulmonary Drug Delivery
- •6.6.6 Ocular Drug Delivery
- •6.6.7 Cardiovascular (CVS) Drug Delivery
- •6.8 Conclusion
- •References
- •7.1 Introduction
- •7.3 Nanocarrier-Based Targeted Drug Delivery
- •7.4.1 Covalent Approach
- •7.4.2 Non-covalent Approach
- •7.4.2.1 PEGylation Via Monovalent Interactions
- •High-Affinity Host-Guest Interactions
- •7.4.2.2 PEGylation Via Multivalent Interactions
- •PEGylated Block Copolymers
- •PEGylated Graft Copolymers
- •Polyelectrolyte Complex-Based Systems
- •Non-ionic Interaction-Based Systems
- •PEGylated Dendritic Copolymers
- •PEGylated Copolymers Utilizing Mobile Side Groups
- •7.5 Various Targeting Strategies
- •7.5.1 Active Targeting
- •7.5.2 Passive Targeting
- •7.5.2.1 PEG Dilemma
- •7.7.1 Brain Disorders
- •7.7.2 Pulmonary Disorders
- •7.7.3 Cancer
- •7.7.4 Inflammatory Disorders
- •7.7.5 Bone Disorders
- •7.7.6 Blood Disorders
- •7.8 Stimuli-Sensitive Nanocarriers
- •7.8.1 External-Responsive Nanocarriers
- •7.8.1.1 Ultrasound-Responsive PEGylated Nanocarriers
- •7.8.1.2 Thermal-Responsive PEGylated Nanocarriers
- •7.8.1.3 Magnetic Responsive PEGylated Nanocarriers
- •7.8.2 Internal-Responsive Nanocarriers
- •7.8.2.1 pH-Responsive Systems
- •7.8.2.2 Redox-Responsive Systems
- •7.8.2.3 Enzyme-Responsive Systems
- •7.8.2.4 Hypoxia-Responsive Systems
- •7.8.3 Multimodal Responsive Nanocarriers
- •7.9 Conclusion
- •References
- •8.1 Introduction
- •8.3.1 PEGylated Liposome
- •8.3.2 PEGylated Micelles
- •8.3.3 PEGylated Nanogels
- •8.3.4 PEGylated Inorganic Nanoparticles
- •8.3.5 PEGylated Polymeric Nanoparticles
- •8.4.1 Cancer
- •8.4.1.1 Breast Cancer
- •8.4.1.2 Lung Cancer
- •8.4.1.3 Colon Cancer
- •8.4.1.4 Brain Cancer
- •8.4.2 Autoimmune Diseases
- •8.4.3 Inflammatory Disorders
- •8.4.4 Cardiovascular Diseases
- •8.4.5 Ocular Diseases
- •8.5 Conclusion
- •References
- •9.1 Introduction
- •9.4.1.1 Amino Acid Modifications
- •9.4.1.3 Cysteine Thiol Residue Conjugation
- •9.4.2 Releasable PEGs
- •9.7.1.1 Cationic Lipid Toxicology
- •9.8 RNA Lipid Nanoparticle
- •9.13 Conclusion
- •References
- •10.2.1 PEGylated Nanocarriers
- •10.2.1.1 Polymeric NPs
- •10.2.1.2 Liposomes
- •10.2.1.3 Dendrimers
- •10.2.1.4 Polymeric Micelles
- •10.6 Conclusion
- •References
- •11.1 Introduction
- •11.1.2 Factors Influencing PPDs’ Short-Term Efficiency
- •11.2 What Is PEGylation?
- •11.3.1 Random PEGylation
- •11.3.2 Site-Specific PEGylation
- •11.3.2.1 Amine Conjugation
- •11.3.2.2 Cysteine Conjugation
- •11.4.1 Binding Affinity
- •11.4.2 Altered Biological Activity
- •11.4.3 Physicochemical Modifications
- •11.4.4 PEG Size
- •11.4.5 PEG Structure
- •11.6 PK Profiling
- •11.9 FDA-Approved PEGylated Products
- •11.11 Conclusion
- •References
- •12.1 Introduction
- •12.1.2 Current Market Scenario
- •12.2.1 PEGylated Iron Oxide Nanoparticles
- •References
- •13.1 Introduction
- •13.2.1 PEGylated Lipid-Based NPs
- •13.2.2 PEGylated Polymeric Nanoparticles
- •13.2.3 PEGylated Metal-Based Nanoparticles
- •13.2.4 Multifunctional PEGylated Nanocarriers
- •13.2.5 Targeted PEGylated Nanocarriers
- •13.3.1 Surface Modification Chemistry
- •13.3.2 Polymer Chemistry
- •13.3.4 Characterization Techniques
- •13.4.1 Longer Circulation Time
- •13.4.2 Enhanced Cellular Uptake
- •13.4.3 Controlled Drug Release
- •13.5.1 Cancer Theragnostic
- •13.5.2 Cardiovascular Theragnostic
- •13.7.2 Prolonged Circulation Time
- •13.7.3 Improved Drug Delivery
- •13.7.4 Diagnostic Functionality
- •13.8 Technical Challenges
- •13.8.4 Limited Clinical Validation
- •13.10 Conclusion
- •References
- •14.1 Introduction
- •14.2 Reversible PEGylation Strategies
- •14.2.1 Reversible PEGylation Chemistry
- •14.2.2.1 Aromatic Linkers
- •14.2.2.2 Aliphatic Linkers
- •14.2.3 Cleavage Linkers
- •14.2.3.1 Hydrolyzable Linkers
- •14.2.3.2 Enzymatically Cleavable Linkers
- •14.2.4 pH-Responsive PEGylation
- •14.2.4.1 Proteasome Inhibitor MG132
- •14.2.5 Temperature-Responsive PEGylation
- •14.2.6 Light-Responsive PEGylation
- •14.3.1 Analytical Techniques
- •Zeta Potential
- •Hydrophobic Interaction Chromatography (HIC)
- •Near Infrared (NIR) Spectroscopy
- •Fourier Transform-Infrared Spectroscopy (FT-IR)
- •13C-NMR
- •Mass Spectrometry
- •High-Performance Liquid Chromatography (HPLC)
- •Calorimetry
- •X-Ray Photoelectron Spectroscopy (XPS)
- •Nuclear Magnetic Resonance (NMR)
- •TGA-DSC
- •14.3.2.1 Protein Adsorption
- •14.3.2.2 Cellular Association
- •14.3.2.5 Bioactivity Assay
- •14.3.2.6 Enzyme-Linked Immunosorbent Assay (ELISA)
- •14.3.2.7 Sandwich ELISA
- •14.3.2.8 Anti-PEG ELISA
- •14.3.3.1 In Vivo Blood Circulation Half-Life
- •14.3.3.2 Radiolabeling
- •14.4.1 Therapeutic Applications
- •14.4.1.1 Anticancer Activity
- •14.4.1.2 Antibiotic Administration
- •14.4.1.3 Enzyme-Replacement Therapy
- •14.4.1.4 Red Blood Cell Substitution
- •14.4.1.5 Oxygen Toxicity Diseases
- •14.4.2 Pharmaceutical Applications
- •14.4.2.1 PEGylated Liposomes
- •14.4.2.2 PEGylated Proteins
- •14.4.2.3 Targeted Delivery
- •14.5.1 Design Complexity
- •14.5.3 Biological Environment Stability
- •14.5.4 Trigger Selection
- •14.5.5 Immunogenicity
- •14.5.6 Scale-up Difficulties
- •14.5.8 Cost
- •14.6 Conclusion
- •References
- •15. Stimuli-Responsive PEGylated Nanocarriers
- •15.1 Introduction
- •15.2 External Stimuli-Responsive Systems
- •15.2.1 Thermoresponsive Systems
- •15.2.2 Magnetically Responsive Systems
- •15.2.3 Ultrasound-Triggered Drug Delivery
- •15.2.4 Light-Triggered Drug Delivery
- •15.2.5 Electroresponsive Systems
- •15.3 Internal Stimuli-Responsive Systems
- •15.3.1 pH-Responsive Systems
- •15.3.2 Redox-Responsive Systems
- •15.3.3 Enzyme-Responsive Systems
- •15.3.4 Self-Regulated Systems
- •15.4.3 Multistimuli Responsive Systems
- •15.7 Conclusion
- •References
- •16.1 Introduction
- •16.3 PEGylated Products
- •16.3.1 PEGylated Liposomes
- •16.3.2 PEGylated G-CSF
- •16.3.3 PEGylated Proteins
- •16.3.4 PEGylated Nanoparticles
- •16.5.1 Poly(Zwitterions)
- •16.5.2 Poly(Glycerols)
- •16.5.3 Poly(Amino Acids)
- •16.5.4 Poly(Oxazolines)
- •16.5.6 Poly(Vinylpyrrolidones)
- •16.5.8 Polypeptides
- •16.5.9 Carbohydrate-Based Systems
- •16.5.10 Hydrophilic Polymers
- •16.5.11 Non-PEGylated Nanoparticles
- •16.6 Future Prospects
- •16.7 Conclusion
- •References

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273


PEGylated Nanocarrier System
forNucleic Acid Delivery
AkhileshTiwari, SreeharshaNagaraja, RakeshSahu,
andMuktikaTekade
Abstract
The transport of nucleic acids to host sites must be successful in creating gene
therapy techniques. Due to their capacity to shield nucleic acids from deteriora-
tion and improve their cellular absorption and bioavailability, PEGylated nano-
carrier systems have demonstrated signicant potential as delivery technologies.
This manuscript outlines creating and evaluating a PEGylated nanocarrier sys-
tem for transporting nucleic acids. The nanocarrier comprised a lipid-based core
for encasing nucleic acids and a polyethylene glycol (PEG) coating to increase
stability and decrease immunogenicity. The nanocarrier may effectively encap-
sulate and shield the nucleic acids from nuclease deterioration. Moreover, it dis-
played invitro minimal cytotoxicity and good cellular uptake and transfection
9
A. Tiwari (*)
Department of Pharmacy, Indira Gandhi National Tribal University, Amarkantak,
Anuppur, Madhya Pradesh, India
S. Nagaraja
Department of Pharmaceutics, Vidya Siri College of Pharmacy, Bengaluru, Karnataka, India
Department of Pharmaceutical Sciences, College of Clinical Pharmacy, King Faisal
University, Al-Ahsa, Saudi Arabia
R. Sahu
National Institute of Pharmaceutical Education and Research (NIPER) Ahmedabad, An
Institute of National Importance, Government of India, Department of Pharmaceuticals,
Ministry of Chemicals and Fertilizers, Palaj, Opp. Air force station, Gandhinagar,
Gujarat, India
M. Tekade
School of Pharmacy, Devi Ahilya Vishwavidyalaya, Takshila Campus,
Indore, Madhya Pradesh, India
School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, India
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A. Tiwari et al.
efciency. In vivo tests revealed that considerable gene activation in the liver was
caused by the nanocarrier’s ability to effectively carry nucleic acids to target cells
in a mouse model.
Keywords
PEGylated · Nanocarrier · Nucleic acid delivery
9.1 Introduction
Therapies based on nucleic acids have shown promise in treating various illnesses,
such as cancer, viral infections, and genetic abnormalities. Unfortunately, nucleic
acid treatments have difculty translating into the clinic due to their poor pharmacokinetics, bioavailability, and lack of adequate and secure delivery mechanisms.
Due to their capacity to shield nucleic acids from deterioration, improve cellular
absorption, and enable intracellular transport, nanocarrier systems, such as liposomes, polymeric nanoparticles, and dendrimers, have been intensively explored as
possible delivery vehicles for nucleic acids (Sridharan and Gogtay 2016; Shtykalova
etal. 2023).
The quick removal of nucleic acids from the circulation by the reticuloendothelial system (RES), which restricts their accumulation at the target location, is one of
the main obstacles to developing efcient nanocarrier systems for nucleic acid
delivery. Increased circulation duration has been achieved via polyethylene glycol
(PEG)ylation, which involves the covalent attachment of PEG chains to the surface
of nanocarriers by reducing their recognition by RES cells. PEGylation can also
enhance the stability and biocompatibility of nanocarriers and reduce their toxicity
and immunogenicity.
Attaching PEG to a molecule is known as PEGylation, sometimes known as
polyethylene glycosylation. The pharmaceutical industry frequently employs this
technique to enhance the pharmacokinetic characteristics of medications, including
extending their duration in circulation and lowering their immunogenicity. Many
medications, including interferons, enzymes, and antibodies, have been proven to
be safer and more effective after being PEGylated. The PEG molecule is biocompatible, non-toxic, and non-immunogenic, making it an ideal candidate for drug
modication. One example of a PEGylated drug is Pegasys chronic hepatitis B, and
C are managed with peginterferon alfa-2a. The addition of PEG to interferon alfa-2a
improves its pharmacokinetic properties and allows for less frequent dosing compared to non-PEGylated interferon alfa-2a. Another example is Adagen (pegademase bovine), a PEGylated enzyme used to treat adenosine deaminase deciency.
The PEGylation of the enzyme increases its half-life and reduces its immunogenicity, allowing for a longer-lasting and more effective treatment (Veronese and
Pasut 2005).
PEGylation is a process that joins the polymer PEG strands to molecules,
most often peptides, proteins, and antibody fragments. It can increase the efcacy
and safety of numerous medicines. The physicochemical characteristics, such as
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