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Articles 1 - 28 of 28
Full-Text Articles in Medicine and Health Sciences
Self-Assembled Ternary Polypeptide Nanoparticles With Improved Biostability For Drug Delivery In Cancer Therapy, Preye Mike Agbana
Self-Assembled Ternary Polypeptide Nanoparticles With Improved Biostability For Drug Delivery In Cancer Therapy, Preye Mike Agbana
Theses and Dissertations--Pharmacy
Cancer remains a real and present threat to global health. In the United States, according to cancer statistics, almost 40% of people will be diagnosed with cancer at some point in their lifetime. Conventional chemotherapy has become the mainstay for cancer treatment option. However, chemotherapeutic agents are plagued with problems such as poor aqueous solubility, chemical degradation, Bio instability, and off-site toxicity due to non-specificity. New drug modalities are needed to tackle the ever-growing burden on cancer. In recent times, the promise of nanotechnology has aided to develop drug delivery vehicles to facilitate the administration of potent chemotherapeutics. Nanoformulations such …
Right Treatment Wrong Time: Immunotherapy Administration Post-Radiotherapy Decreases Tumor Burden In A Preclinical Model Of Brain Metastasis, Kathryn Elizabeth Blethen
Right Treatment Wrong Time: Immunotherapy Administration Post-Radiotherapy Decreases Tumor Burden In A Preclinical Model Of Brain Metastasis, Kathryn Elizabeth Blethen
Graduate Theses, Dissertations, and Problem Reports
This dissertation (a) provided an in-depth literature review of methods to modulate the blood-brain and blood-tumor barriers to increase drug delivery and efficacy in brain metastases, (b) evaluated the effects of whole-brain radiation therapy on the blood-brain barrier in immunocompetent and immunocompromised mouse models and proposed a mechanism by which the immune response to radiation disrupts the blood-brain barrier, and (c) developed a syngeneic lung cancer brain metastasis model to determine the impact of coordinated immunotherapy administration with radiotherapy. The blood-brain barrier is an impediment to drug delivery to the brain. The inherent leakiness of the blood-tumor barrier does not …
Frontiers In The Self-Assembly Of Charged Macromolecules, Khatcher O. Margossian
Frontiers In The Self-Assembly Of Charged Macromolecules, Khatcher O. Margossian
Doctoral Dissertations
The self-assembly of charged macromolecules forms the basis of all life on earth. From the synthesis and replication of nucleic acids, to the association of DNA to chromatin, to the targeting of RNA to various cellular compartments, to the astonishingly consistent folding of proteins, all life depends on the physics of the organization and dynamics of charged polymers. In this dissertation, I address several of the newest challenges in the assembly of these types of materials. First, I describe the exciting new physics of the complexation between polyzwitterions and polyelectrolytes. These materials open new questions and possibilities within the context …
The Use Of Silica Nanoparticles For Controlled Drug Delivery Of Nicotine, Jennifer C. Iwenofu
The Use Of Silica Nanoparticles For Controlled Drug Delivery Of Nicotine, Jennifer C. Iwenofu
Honors College Theses
Drug molecules can be administered in different ways to the human body. Nanotechnology stands out over other alternatives by delivering drugs to specific locations and reducing reactivity time. In this research, the hydrogen bond between silica nanoparticles and the drug molecule, nicotine, were studied to controllably deliver nicotine by varying pH values.
Effect Of Chemical And Physical Enhancers On The Skin Permeation Of Cromolyn Sodium, Miranda Holman
Effect Of Chemical And Physical Enhancers On The Skin Permeation Of Cromolyn Sodium, Miranda Holman
Electronic Theses and Dissertations
Cromolyn sodium (CS) has clinically shown to be an effective topical remedy for atopic dermatitis, however its physiochemical properties prevent efficient passive drug delivery beyond the outermost skin layer. This project aimed to optimize CS gel formulations and applications to improve drug delivery to the dermis of skin by examining various topical enhancement strategies. Oleic acid, salcaprozate sodium, and microneedles were investigated as enhancers for their effect on skin permeation of CS. In vitro permeation studies across dermatomed porcine ear skin tested CS gels to determine 24-hour drug permeation profiles and skin layer distribution of drug. Further, extraction method efficiency, …
Liposomal Technologies To Improve Gene Delivery, David Nardo Padron
Liposomal Technologies To Improve Gene Delivery, David Nardo Padron
Theses and Dissertations--Pharmacy
Lipid based nanoparticles (LBNs) are used in myriad applications in medicine from small molecule drug delivery to mRNA vaccines. A major contributing factor to the development of the field has been the ongoing development of novel compounds that retain the functionality of natural lipids but expand upon them through inclusion of functional moieties that can be applied to specific scientific and biomedical questions. In the body of this dissertation, an extensive overview of LBNs is provided, focusing primarily on their use in immune modulation. The research presented herein begins with the synthesis of a novel class of lipids based on …
Exploiting Modulation Of The Blood-Brain And Blood-Tumor Barrier Permeability By Translational Focused Ultrasound For Therapeutic Delivery To Cns Metastases, Tasneem A. Arsiwala
Exploiting Modulation Of The Blood-Brain And Blood-Tumor Barrier Permeability By Translational Focused Ultrasound For Therapeutic Delivery To Cns Metastases, Tasneem A. Arsiwala
Graduate Theses, Dissertations, and Problem Reports
Transcranial low-intensity focused ultrasound is a unique technology to modulate the integrity of tight endothelial junctions and transiently increase BBB/BTB permeability to enhance therapeutic delivery. Despite promising early studies, present literature lacks agreement on key experimental conditions, which restricts our knowledge and the technique's widespread translation. This dissertation first provides a critical review of the current gaps in knowledge regarding the universal use of LiFUS in preclinical and clinical use. We then identify key parameters for translational and predictable opening of the BBB using a 3T MRI coupled with a clinical device. Our investigation highlights that passive permeability of the …
Protein-Based Nanofibers And Thin Films For Drug Delivery Applications, Christopher R. Gough
Protein-Based Nanofibers And Thin Films For Drug Delivery Applications, Christopher R. Gough
Theses and Dissertations
Corn zein and silk are both widely available, easy to extract proteins making them valuable replacements for synthetics. Zein and silk are also promising biomaterials in several applications. This work explores the use of both proteins as drug delivery vehicles by loading 1-Dimensional micro-nanofibers and 2-Dimensional thin films with model drugs or the topical therapeutic sodium citrate. Using a formic acid solvent, powdered zein protein or silk fibers were dissolved into solution and then casted into 2D films or spun into 1D fibers through air-spraying. During dissolution, therapeutic products are added. SEM images showed that fibers maintain their small diameter …
Hybrid Cyclic-Linear Cell-Penetrating Peptides Containing Alternative Positive And Hydrophobic Residues As Molecular Transporters, Sorour Khayyatnejad Shoushtari
Hybrid Cyclic-Linear Cell-Penetrating Peptides Containing Alternative Positive And Hydrophobic Residues As Molecular Transporters, Sorour Khayyatnejad Shoushtari
Pharmaceutical Sciences (MS) Theses
The cell membrane properties create a significant obstacle in intracellular delivery of cell-impermeable and negatively charged molecules. Amphiphilic cyclic peptides containing alternative arginine and tryptophan such as [WR]5 have been shown to enhance the transport of cargo molecules across the cell membrane. Herein, we report the synthesis and biological evaluation of a novel series of hybrid cyclic-linear peptides containing alternative positive and hydrophobic amino acids on the ring and side-chain [(RW)5]K(RW)X (X=1-5) to compare their molecular transporter efficiency. The peptides were synthesized through Fmoc solid-phase peptide synthesis. Final compounds were purified by a reversed-phase HPLC (High …
Ligand-Installed Polymeric Nanocarriers For Combination Chemotherapy, Xinyuan Xi
Ligand-Installed Polymeric Nanocarriers For Combination Chemotherapy, Xinyuan Xi
Theses & Dissertations
Combination chemotherapy remains the mainstay of cancer treatment because such strategy targets different cell signaling pathways to decrease the likelihood of developing protective mechanisms by cancer cells, thereby delaying the onset of recurrence and prolonging the survival. The co-delivery of binary drug combination via a single nanocarrier provides benefits in reducing dose-limiting toxicities, improving the pharmacokinetic properties of the cargo, spatial-temporal synchronization of drug exposure, and synergistic therapeutic effects. Rational design of such regimen is crucial for maximizing the therapeutic effects since only certain drug ratios exposed to the target might be synergistic while other ratios exert additive or even …
Pilot Study Exploring The Effect Of Targeted Cox-2 Inhibition In Macrophages Responding To Neuronal Injury; Promoting Enhanced Axonal Regeneration, Alyssa Brauckmann
Pilot Study Exploring The Effect Of Targeted Cox-2 Inhibition In Macrophages Responding To Neuronal Injury; Promoting Enhanced Axonal Regeneration, Alyssa Brauckmann
Electronic Theses and Dissertations
Celecoxib nanoemulsion (CXB-NE) has been developed as a macrophage targeted analgesics by Dr. Janjic and her team at Duquesne University, (Janjic et al, 2018; Liu et al, 2020; Saleem et al, 2019b; Vasudeva et al, 2014). The CXB-NE nanoemulsion carrying a Nonsteroidal Anti-inflammatory (NSAID) inhibitor of COX-2 activity result in a reduction in PGE2 expression in macrophages. Using CXB-NE in rats that have peripheral nerve injury constricting the sciatic nerve relieves hypersensitivity, a pain-like behavior. The treatment also decreases inflammation associated with this chronic constriction injury (Janjic et al, 2018; Saleem et al, 2019b; Stevens et al, 2019). In this …
Formulation Strategies To Enhance Solubility And Permeability Of Small Molecules For Drug Delivery Applications, Pradeep Kumar Bolla
Formulation Strategies To Enhance Solubility And Permeability Of Small Molecules For Drug Delivery Applications, Pradeep Kumar Bolla
Open Access Theses & Dissertations
All the new chemical entities/drug molecules intended for therapeutic use must be administered using an appropriate delivery system/dosage form to achieve maximum bioavailability. However, designing a drug delivery system is complex as several factors such as lipophilicity, molecular mass, crystallinity, ionic charge, polymorphic forms and hydrogen bonding) affect the solubility and permeability of these molecules. Biopharmaceutics drug classification system (BCS) categorizes the existing drugs into four classes based on the aqueous solubility and membrane permeability and it is reported that >70% of the drugs are poorly soluble and belong to BCS class II and BCS class IV. Several physical, chemical …
Iron-Containing Nanoparticles For The Treatment Of Chrionic Biofilm Infections In Cystic Fibrosis, Leisha M. A. Martin
Iron-Containing Nanoparticles For The Treatment Of Chrionic Biofilm Infections In Cystic Fibrosis, Leisha M. A. Martin
Nanoscience and Microsystems ETDs
Cystic fibrosis (CF) is the most common genetic disease resulting in the morbidity and mortality of Caucasian children and adults worldwide. Due to a genetic mutation resulting in malfunction of the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) protein, CF patients produce highly viscous mucus in their respiratory tract. This leads to impairment of the mucociliary clearance of inhaled microbes. In addition to reduced microbial clearance, anoxic environmental conditions in the lungs promote biofilm-mode growth of the pathogenic bacterial species Pseudomonas aeruginosa. Chronic infections of P. aeruginosa begin in early childhood and typically persist until respiratory failure and death result. The …
Mechanisms And Thermodynamics Of The Influence Of Solution-State Interactions Between Hpmc And Surfactants On Mixed Adsorption Onto Model Nanoparticles, Salin Gupta Patel
Mechanisms And Thermodynamics Of The Influence Of Solution-State Interactions Between Hpmc And Surfactants On Mixed Adsorption Onto Model Nanoparticles, Salin Gupta Patel
Theses and Dissertations--Pharmacy
Nanoparticulate drug delivery systems (NDDS) such as nanocrystals, nanosuspensions, solid-lipid nanoparticles often formulated for the bioavailability enhancement of poorly soluble drug candidates are stabilized by a mixture of excipients including surfactants and polymers. Most literature studies have focused on the interaction of excipients with the NDDS surfaces while ignoring the interaction of excipients in solution and the extent to which the solution-state interactions influence the affinity and capacity of adsorption. Mechanisms by which excipients stabilize NDDS and how this information can be utilized by formulators a priori to make a rational selection of excipients is not known.
The goals of …
Development Of Novel Therapies For The Treatment Of Inflammatory Bowel Disease, Shrey Kanvinde
Development Of Novel Therapies For The Treatment Of Inflammatory Bowel Disease, Shrey Kanvinde
Theses & Dissertations
Inflammatory bowel disease (IBD) is a chronic and remittent inflammation of the gastrointestinal tract (GIT). Despite extensive research efforts, there is no cure nor a well-defined pathogenesis for IBD. Loss of epithelial barrier function, increased colonic immune cell infiltration and upregulation of pro-inflammatory cytokines are the hallmarks of IBD. Despite treatments like painkillers, aminosalicylates, steroids, and biologics, almost 70% patients require surgery at least once in their life time. The main limitation with most of the current treatments is they are either absorbed systemically or administered systemically resulting in adverse side effects. As a result, there is a huge unmet …
Synthesis And Characterization Of Redox-Sensitive Polymer And Prodrug For Targeted Drug Delivery, Chang-Hee Whang
Synthesis And Characterization Of Redox-Sensitive Polymer And Prodrug For Targeted Drug Delivery, Chang-Hee Whang
Electronic Theses and Dissertations
Systemic administration of chemotherapeutics is associated with various side effects deriving from accumulation in off-target sites and acute toxicity of the drugs. In the past decade, engineering targeted drug delivery platforms arose as a novel paradigm to overcome such obstacles and ultimately achieve advanced forms of chemotherapy. This thesis reports successful syntheses of l-RSP, a redox-sensitive self-immolative polymer, and DNS-SN38, thiol-sensitive SN-38 prodrug, as potential candidates for targeted drug delivery platforms. By covalently conjugating a redox-trigger (p-nitrobenzyl alcohol) and self-immolative linker (p-hydroxybenzyl alcohol) to the cyclization spacer (n-2-(hydroxyethyl)ethylene diamine), a novel self-immolative monomer was obtained. Polymerization of the respective monomer …
Delivery Of Small Molecule And Rna For The Treatment Of Type 1 Diabetes And Prostate Cancer, Di Wen
Delivery Of Small Molecule And Rna For The Treatment Of Type 1 Diabetes And Prostate Cancer, Di Wen
Theses & Dissertations
The aim of this thesis is to develop combination therapy using a small molecule and RNA including siRNA, shRNA, or miRNA inhibitor for the treatment of type 1 diabetes and prostate cancer. New amphiphilic biodegradable polymers capable of co-delivering small hydrophobic molecules and RNAs or human bone marrow-derived mesenchymal stem cell (hBMSC) for co-delivery of an shRNA and a miRNA inhibitor were used as drug delivery platform. The drug delivery properties were evaluated in vitro and in vivo islet transplantation, subcutaneous and orthotopic prostate cancer models.
In Chapter 1, an overview of prostate cancer, the role of miRNA and …
Liposome-Coated Magnesium Phosphate Nanoparticle For Delivery Of Cytochrome C Into Lung Cancer Cells A549, Weizhou Yue
Liposome-Coated Magnesium Phosphate Nanoparticle For Delivery Of Cytochrome C Into Lung Cancer Cells A549, Weizhou Yue
University of the Pacific Theses and Dissertations
Proteins are large biomolecules that have great therapeutic potential in treating many human diseases. However, chemical/enzymatic degradation, denaturation, and poor penetration into cells are some of the challenges for clinical use of intracellular proteins.
Previously, our group has developed cationic lipid-coated magnesium phosphate nanoparticle (LP MgP NP-CAT) formulations to enhance the intracellular delivery of the negatively charged protein catalase. The goal of the current research is to develop a formulation to deliver cytochrome c (CytC), a positively charged protein into lung cancer cells A549. Specifically, this thesis research prepares and tests liposome-coated magnesium phosphate nanoparticle for delivery of cytochrome c …
The Development Of Preclinical Strategies For Facilitation Of Lead Candidate Selection, Christopher Dale Kulczar
The Development Of Preclinical Strategies For Facilitation Of Lead Candidate Selection, Christopher Dale Kulczar
Open Access Dissertations
Chapter 1 details a background of techniques used for modeling the blood-brain barrier (BBB). The BBB represents a diffusive barrier to both paracellular and transcellular movement of many compounds in and out of the brain. The main rate- limiting barriers of the BBB include exclusive tight junctions that prevent the movement of hydrophilic molecules through intercellular gaps, and efflux proteins in the membrane which pump many hydrophobic molecules back into the blood. In addition, the BBB contains metabolizing enzymes, including Cytochrome P450s. This barrier acts to protect the vulnerable tissues of the brain from harmful xenobiotics, but also can serve …
Polymeric Nanocarriers For Treatment Of Melanoma And Genetically Modified Mesenchymal Stem Cells To Improve Outcome Of Islet Transplantation, Vaibhav Mundra
Polymeric Nanocarriers For Treatment Of Melanoma And Genetically Modified Mesenchymal Stem Cells To Improve Outcome Of Islet Transplantation, Vaibhav Mundra
Theses & Dissertations
Melanoma is a lethal malignancy with limited treatment options for advanced metastatic stages. New targeted therapeutic options with discovery of BRAF and MEK inhibitors have shown significant survival benefit. Despite the recent progress, inefficient tumor accumulation and dose limiting systemic toxicity remains pressing challenges for treating metastatic melanoma and there is a need for drug delivery approach to improve therapeutic index of chemotherapeutics. Nanoparticle based drug delivery represents promising approach to enhance efficacy and reduce the dose limiting systemic toxicity. Nanoparticles can be formulated either by physical encapsulation of drugs or by covalent conjugation of drugs to the polymeric backbone. …
Ligand-Receptor Interactions For Supramolecular Disassembly With Applications In Screening And Drug Delivery, Diego Amado Torres
Ligand-Receptor Interactions For Supramolecular Disassembly With Applications In Screening And Drug Delivery, Diego Amado Torres
Doctoral Dissertations
Proteins have the capacity to bind specific sets of compounds known as ligands, these are small molecules with a recurrent theme in their molecular design that is a characteristic exploited here to (i) identify particular affinities of small molecules for proteins with the aim of using them as ligands, inhibitors, or targeting moieties in more complex systems by means of a methodology that screens small molecules based on protein affinity; (ii) decorate a self-assembling supramolecular system at different positions, making it responsive to a complementary protein with the aim of exploring differences in disassembly and sensitivity of the release of …
Turning Stealth Liposomes Into Cationic Liposomes For Anticancer Drug Delivery, Vijay Gyanani
Turning Stealth Liposomes Into Cationic Liposomes For Anticancer Drug Delivery, Vijay Gyanani
University of the Pacific Theses and Dissertations
Targeting the anticancer agents selectively to cancer cells is desirable to improve the efficacy and to reduce the side effects of anticancer therapy. Previously reported passive tumor targeting by PEGylated liposomes (stealth liposomes) have resulted in their higher tumor accumulation. However their interaction with cancer cells has been minimal due to the steric hindrance of the PEG coating. This dissertation reports two approaches to enhance the interaction of stealth liposomes with cancer cells. First, we designed a lipid-hydrazone-PEG conjugate that removes the PEG coating at acidic pH as in the tumor interstitium. However, such a conjugate was highly unstable on …
Encapsulation And Controlled Release Of Rhu-Erythropoietin From Chitosan Biopolymer Nanoparticles, Cody Bulmer
Encapsulation And Controlled Release Of Rhu-Erythropoietin From Chitosan Biopolymer Nanoparticles, Cody Bulmer
Electronic Thesis and Dissertation Repository
The objective of this research project was to develop a drug delivery system for recombinant human erythropoietin (rHu-EPO), a glycoprotein hormone used in the treatment of renal anaemia and chemotherapy induced anaemia, using the biopolymer chitosan as the base component. Two types of chitosan nanoparticles were produced through ionotropic gelation using flush mixing with either tripolyphosphate (TPP) or carrageenan polymer. Chitosan-TPP and chitosan-carrageenan nanoparticles were generated under a variety of conditions to evaluate the effects of chitosan concentration, chitosan to anion mass ratio and solution pH on the nanoparticle characteristics of particle diameter, surface charge and particle size distribution. A …
Nanocrystals Of Chemotherapeutic Agents For Cancer Theranostics: Development And In Vitro And In Vivo Evaluation, Christin P. Hollis
Nanocrystals Of Chemotherapeutic Agents For Cancer Theranostics: Development And In Vitro And In Vivo Evaluation, Christin P. Hollis
Theses and Dissertations--Pharmacy
The majority of pharmacologically active chemotherapeutics are poorly water soluble. Solubilization enhancement by the utilization of organic solvents often leads to adverse side effects. Nanoparticle-based cancer therapy, which is passively targeted to the tumor tissue via the enhanced permeation and retention effect, has been vastly developed in recent years. Nanocrystals, which exist as crystalline and carry nearly 100% drug loading, has been explored for delivering antineoplastic agents. Additionally, the hybrid nanocrystal concept offers a novel and simple way to integrate imaging agents into the drug crystals, enabling the achievement of theranostics. The overall objective of this dissertation is to formulate …
Nanofabrication Of Halloysite-Pcl Composite Scaffolds And Functionalization Of Titanium For Tissue Regeneration, Shraddha Parshottambhai Patel
Nanofabrication Of Halloysite-Pcl Composite Scaffolds And Functionalization Of Titanium For Tissue Regeneration, Shraddha Parshottambhai Patel
Doctoral Dissertations
Major medical needs may be achieved through regenerative medicine. Nanotechnology has triggered a research revolution in many important areas such as the biomedical sciences and bioengineering at the molecular level which has grown significantly due to the availability of new analytical applications and tools based on nanotechnology. Clinical conditions and diseases being targeted by nanotechnology research include burns, Alzheimer's and Parkinson's disease, implant failure, improved wound healing, birth defects, osteoporosis and congestive heart defects. Therapeutic use of growth factors and drugs to stimulate the production and/or function of endogenous cells represents a key area of regenerative medicine. The development of …
Ultrasonic Assisted Layer-By-Layer Assembly For Stable Nanocolloids Of Curcumin And Paclitaxel, Zhiguo Zheng
Ultrasonic Assisted Layer-By-Layer Assembly For Stable Nanocolloids Of Curcumin And Paclitaxel, Zhiguo Zheng
Doctoral Dissertations
Researchers have been trying to fight cancer with synthesis of new bioactive compounds but many of these novel drugs have low solubility in water and it is difficult to deliver them into a patient's body. One way of solving this particular problem is to use nanoscale drug delivery systems. In this dissertation, we describe using an ultrasonic assisted layer-by-layer encapsulation process to prepare anti-cancer drugs with 50∼200 nm particle size with designed coating to achieve sustained release and target delivery.
Two methods for systematic manufacture of low solubility anti-cancer drug nanoparticles were proposed: I) Top-down approach to breakdown larger drug …
Pulmonary Delivery Of Anorectic Gut Secreted Peptides For Appetite Suppression In Rats, Priya Nadkarni
Pulmonary Delivery Of Anorectic Gut Secreted Peptides For Appetite Suppression In Rats, Priya Nadkarni
Theses and Dissertations
This dissertation project aimed to demonstrate that pulmonary delivery of two anorectic gut secreted peptides, peptide YY (PYY) and oxyntomodulin (OXM) enabled food intake suppression and reduced body weight gain in rats via their systemic absorption from the lung and interaction with the brain. After PYY and OXM were administered to the lungs at varying doses, food intake and body weight gain were monitored in freely feeding rats. Significant 30-35 % food intake suppression was achieved for 4-6 h following pulmonary administration of endogenously active PYY3-36 and OXM1-37 at 0.80 and 0.50 mg/kg, respectively. Moreover, when administered daily for 7 …
Chemical And Biochemical Modification Of Surfaces For Control Of Wettability, Adsorption, And Drug Delivery, Susan C. D'Andrea
Chemical And Biochemical Modification Of Surfaces For Control Of Wettability, Adsorption, And Drug Delivery, Susan C. D'Andrea
Seton Hall University Dissertations and Theses (ETDs)
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