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Special Issue "New Insights on Drug Design, Delivery and Targeting in Neurodegeneration"

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A special issue of Pharmaceutics (ISSN 1999-4923). This special issue belongs to the section "Drug Targeting and Design".

Deadline for manuscript submissions: 31 July 2023 | Viewed by 10227

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Special Issue Editors

Prof. Dr. Renata Silva

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Guest Editor

1. Associate Laboratory i4HB - Institute for Health and Bioeconomy, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal
2. UCIBIO - Applied Molecular Biosciences Unit, REQUIMTE, Laboratory of Toxicology, Department of Biological Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal
Interests: toxicology; pharmacology; ADME/toxicokinetics; membrane transporters; P-glycoprotein; neurodegeneration; drugs of Abuse; drug discovery

Prof. Dr. Daniel José Barbosa

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Guest Editor

1. TOXRUN – Toxicology Research Unit, Department of Sciences, University Institute of Health Sciences, CESPU, CRL, 4585-116 Gandra, Portugal
2. Cell Division Mechanisms Group, Institute for Research and Innovation in Health (i3S), University of Porto, 4200-135 Porto, Portugal
Interests: molecular motors; intracellular transport; cell biology; molecular biology; drugs of abuse; neurodegeneration; pharmacology; toxicology; forensic sciences
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Special Issue Information

Dear Colleagues,

Neurodegenerative diseases represent a heterogenous group of disorders characterized by progressive degeneration and death of neuronal populations. They affect millions of people worldwide, greatly impacting patient’s quality of life and raising strong economic and health concerns for society. This problem is even more fundamental as the available therapies remain fairly limited and mainly focusing on symptoms relief. Thus, the development of novel drug candidates, based on state-of-the-art chemistry methodologies and/or sparsely explored chemical substances, could help to identify lead compounds with potential pharmaceutical application.

On the other hand, in most cases, the lack of drug efficacy in neurodegeneration treatment comes from a compromised drug delivery to their target sites. Thus, the development of cutting-edge drug delivery systems and approaches would add substantial advance in neurodegeneration treatment.

In this special issue we are interested in reviews and original articles describing novel chemical design-based drug candidates and improved delivery systems to target sites with potential to deal with neurodegeneration.

Prof. Dr. Renata Silva
Prof. Dr. Daniel José Barbosa
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Pharmaceutics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

drug design and discovery
drug delivery
drug targeting
neurodegeneration
new therapeutic strategies
in vitro models of neurodegeneration

Published Papers (9 papers)

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Research

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Open AccessArticle

An In Vitro Evaluation of the Potential Neuroprotective Effects of Intranasal Lipid Nanoparticles Containing Astaxanthin Obtained from Different Sources: Comparative Studies

Joana Torres

José Miguel Pereira

Rita Marques-Oliveira

Andreia Filipa Peixoto

José Manuel Sousa Lobo

and

Ana Catarina Silva

Pharmaceutics 2023, 15(4), 1035; https://doi.org/10.3390/pharmaceutics15041035 - 23 Mar 2023

Viewed by 759

Abstract

The intranasal route has been suggested as a promising alternative to improve the direct transport of molecules to the brain, avoiding the need to cross the blood–brain barrier (BBB). In this area, the use of lipid nanoparticles, namely solid lipid nanoparticles (SLN) and nanostructured lipid carriers (NLC), has been highlighted as a promising strategy to improve the treatment of neurodegenerative diseases. In this work, formulations containing SLN and NLC that were loaded with astaxanthin that was obtained from different sources (astaxanthin extract (AE) from the algae Haematococcus pluvialis and pure astaxanthin (PA) from the fungi Blakeslea trispora) were prepared for nose-to-brain administration, and comparative in vitro experiments were performed to evaluate the biocompatibility of the formulations with nasal (RPMI 2650) and neuronal (SH-SY5Y) cells. Afterwards, the antioxidant activity of the formulations was evaluated for its potential neuroprotective effects, using different chemical aggressors. Finally, the cellular uptake of the astaxanthin was evaluated for the formulations that showed the greatest neuroprotection of the neuronal cells against chemical-induced damage. On the production day, all the formulations showed a particle size, a high encapsulation efficiency (EE), the presence of nanoparticles with a typical spherical shape, and a polydispersity index (PDI) and zeta potential (ZP) that are suitable for nose-to-brain administration. After three months of storage at room temperature, no significant changes were observed in the characterization parameters, predicting a good long-term stability. Furthermore, these formulations were shown to be safe with concentrations of up to 100 µg/mL in differentiated SH-SY5Y and RPMI 2650 cells. Regarding neuroprotection studies, the PA-loaded SLN and NLC formulations showed an ability to counteract some mechanisms of neurodegeneration, including oxidative stress. Moreover, when compared with the PA-loaded SLN, the PA-loaded NLC showed greater neuroprotective effects against the cytotoxicity induced by aggressors. In contrast, the AE-loaded SLN and NLC formulations showed no significant neuroprotective effects. Although further studies are needed to confirm these neuroprotective effects, the results of this study suggest that the intranasal administration of PA-loaded NLC may be a promising alternative to improve the treatment of neurodegenerative diseases. Full article

(This article belongs to the Special Issue New Insights on Drug Design, Delivery and Targeting in Neurodegeneration)

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Open AccessArticle

Dose-Effect Determination of a Neuroprotector Fraction Standardized in Coumarins of Tagetes lucida and Bioavailability

Anislada Santibáñez

Maribel Herrera-Ruiz

Manasés González-Cortazar

Pilar Nicasio-Torres

Ashutosh Sharma

and

Enrique Jiménez-Ferrer

Pharmaceutics 2023, 15(3), 967; https://doi.org/10.3390/pharmaceutics15030967 - 17 Mar 2023

Viewed by 686

Abstract

Neurodegeneration has been associated with chronic inflammation states in the brain. For this reason, attention has been directed to drugs indicated as anti-inflammatory as possible therapies for the treatment of said conditions. Tagetes lucida has been widely used as a folk remedy in illnesses associated with the central nervous system and inflammatory ailments. Among the compounds that stand out in the plant against these conditions are coumarins, such as 7-O-prenyl scopoletin, scoparone, dimethylfraxetin, herniarin, and 7-O-prenylumbelliferone. Therefore, the relationship between the therapeutic effect and the concentration was evaluated through pharmacokinetic and pharmacodynamic studies, including vascular permeability evaluation by blue Evans and pro- and anti-inflammatory cytokines quantification, under a neuroinflammation model induced by lipopolysaccharide by the oral administration of three different doses (5, 10, and 20 mg/kg) of a bioactive fraction of T. lucida. In the present study, it was found that all doses showed a neuroprotective and immunomodulatory effect, although the doses of 10 and 20 mg/kg were able to exert their effect for a longer time and to a greater extent. The protective effects of the fraction may be mainly associated with the DR, HR, and SC coumarins due to their structural profile and plasmatic and brain tissue bioavailability. Full article

(This article belongs to the Special Issue New Insights on Drug Design, Delivery and Targeting in Neurodegeneration)

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Open AccessArticle

Synthesis of Schiff Bases Containing Phenol Rings and Investigation of Their Antioxidant Capacity, Anticholinesterase, Butyrylcholinesterase, and Carbonic Anhydrase Inhibition Properties

and

Pharmaceutics 2023, 15(3), 779; https://doi.org/10.3390/pharmaceutics15030779 - 26 Feb 2023

Cited by 3 | Viewed by 1149

Abstract

The widespread usage of Schiff bases in chemistry, industry, medicine, and pharmacy has increased interest in these compounds. Schiff bases and derivative compounds have important bioactive properties. Heterocyclic compounds containing phenol derivative groups in their structure have the potential to capture free radicals that can cause diseases. In this study, we designed and synthesized eight Schiff bases (10–15) and hydrazineylidene derivatives (16–17), which contain phenol moieties and have the potential to be used as synthetic antioxidants, for the first time using microwave energy. Additionally, the antioxidant effects of Schiff bases (10–15) and hydrazineylidene derivatives (16–17) were studied using by the bioanalytical methods of 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) cation radical (ABTS^•+) and 1,1-diphenyl-2-picrylhydrazyl (DPPH^•) scavenging activities, and Fe³⁺, Cu²⁺, and Fe³⁺-TPTZ complex reducing capacities. In the context of studies on antioxidants, Schiff bases (10–15) and hydrazineylidene derivatives (16–17) were found to be as powerful DPPH (IC₅₀: 12.15–99.01 μg/mL) and ABTS^•+ (IC₅₀: 4.30–34.65 μg/mL). Additionally, the inhibition abilities of Schiff bases (10–15) and hydrazineylidene derivatives (16–17) were determined towards some metabolic enzymes including acetylcholinesterase (AChE), butyrylcholinesterase (BChE), and human carbonic anhydrase I and II (hCAs I and II), enzymes that are linked to some global disorders including Alzheimer’s disease (AD), epilepsy, and glaucoma. In the context of studies on enzyme inhibition, it was observed that the synthesized Schiff bases (10–15) and hydrazineylidene derivatives (16–17) inhibited AChE, BChE, hCAs I, and hCA II enzymes with IC₅₀ values in ranges of 16.11–57.75 nM, 19.80–53.31 nM, 26.08 ± 8.53 nM, and 85.79 ± 24.80 nM, respectively. In addition, in light of the results obtained, we hope that this study will be useful and guiding for the evaluation of biological activities in the fields of the food, medical, and pharmaceutical industries in the future. Full article

(This article belongs to the Special Issue New Insights on Drug Design, Delivery and Targeting in Neurodegeneration)

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Open AccessArticle

Indene-Derived Hydrazides Targeting Acetylcholinesterase Enzyme in Alzheimer’s: Design, Synthesis, and Biological Evaluation

Shraddha Manish Gupta

Shailesh Mani Tripathi

Somdutt Mujwar

Jeevan Patra

and

Arvind Negi

Pharmaceutics 2023, 15(1), 94; https://doi.org/10.3390/pharmaceutics15010094 - 28 Dec 2022

Cited by 1 | Viewed by 1519

Abstract

As acetylcholinesterase (AChE) plays a crucial role in advancing Alzheimer’s disease (AD), its inhibition is a promising approach for treating AD. Sulindac is an NSAID of the aryl alkanoic acid class, consisting of a indene moiety, which showed neuroprotective behavior in recent studies. In this study, newer Indene analogs were synthesized and evaluated for their in vitro AChE inhibition. Additionally, compared with donepezil as the standard drug, these Indene analogs were accessed for their cell line-based toxicity study on SH-SY5Y cell line. The molecule SD-30, having hydrogen bond donor (HBD) at para-position, showed maximum AChE inhibition potential (IC₅₀ 13.86 ± 0.163 µM) in the indene series. Further, the SD-30 showed maximum BuChE inhibition potential (IC₅₀ = 48.55 ± 0.136 µM) with a selectivity ratio of 3.50 and reasonable antioxidant properties compared to ascorbic acid (using DPPH assay). SD-30 (at a dose level: of 10 µM, 20 µM) effectively inhibited AChE-induced Aβ aggregation and showed no significant toxicity up to 30 mM against SH-SY5Y cell lines. Full article

(This article belongs to the Special Issue New Insights on Drug Design, Delivery and Targeting in Neurodegeneration)

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Open AccessArticle

Fiscalin Derivatives as Potential Neuroprotective Agents

and

Pharmaceutics 2022, 14(7), 1456; https://doi.org/10.3390/pharmaceutics14071456 - 12 Jul 2022

Cited by 3 | Viewed by 1090

Abstract

Neurodegenerative diseases (ND) share common molecular/cellular mechanisms that contribute to their progression and pathogenesis. In this sense, we are here proposing new neuroprotection strategies by using marine-derived compounds as fiscalins. This work aims to evaluate the protective effects of fiscalin derivatives towards 1-methyl-4-phenylpyridinium (MPP⁺)- and iron (III)-induced cytotoxicity in differentiated SH-SY5Y cells, an in vitro disease model to study ND; and on P-glycoprotein (P-gp) transport activity, an efflux pump of drugs and neurotoxins. SH-SY5Y cells were simultaneously exposed to MPP⁺ or iron (III), and noncytotoxic concentrations of 18 fiscalin derivatives (0–25 μM), being the cytotoxic effect of both MPP⁺ and iron (III) evaluated 24 and 48 h after exposure. Fiscalins 1a and 1b showed a significant protective effect against MPP⁺-induced cytotoxicity and fiscalins 1b, 2b, 4 and 5 showed a protective effect against iron (III)-induced cytotoxicity. Fiscalins 4 and 5 caused a significant P-gp inhibition, while fiscalins 1c, 2a, 2b, 6 and 11 caused a modest increase in P-gp transport activity, thus suggesting a promising source of new P-gp inhibitors and activators, respectively. The obtained results highlight fiscalins with promising neuroprotective effects and with relevance for the synthesis of new derivatives for the treatment/prevention of ND. Full article

(This article belongs to the Special Issue New Insights on Drug Design, Delivery and Targeting in Neurodegeneration)

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Open AccessArticle

Glial Fibrillary Acidic Protein: A Biomarker and Drug Target for Alzheimer’s Disease

Akshatha Ganne

Meenakshisundaram Balasubramaniam

W. Sue T. Griffin

Robert J. Shmookler Reis

and

Srinivas Ayyadevara

Pharmaceutics 2022, 14(7), 1354; https://doi.org/10.3390/pharmaceutics14071354 - 26 Jun 2022

Cited by 2 | Viewed by 1647

Abstract

Glial fibrillary acidic protein (GFAP) is an intermediate filament structural protein involved in cytoskeleton assembly and integrity, expressed in high abundance in activated glial cells. GFAP is neuroprotective, as knockout mice are hypersensitive to traumatic brain injury. GFAP in cerebrospinal fluid is a biomarker of Alzheimer’s disease (AD), dementia with Lewy bodies, and frontotemporal dementia (FTD). Here, we present novel evidence that GFAP is markedly overexpressed and differentially phosphorylated in AD hippocampus, especially in AD with the apolipoprotein E [ε4, ε4] genotype, relative to age-matched controls (AMCs). Kinases that phosphorylate GFAP are upregulated in AD relative to AMC. A knockdown of these kinases in SH-SY5Y-APP_Sw human neuroblastoma cells reduced amyloid accrual and lowered protein aggregation and associated behavioral traits in C. elegans models of polyglutamine aggregation (as observed in Huntington’s disease) and of Alzheimer’s-like amyloid formation. In silico screening of the ChemBridge structural library identified a small molecule, MSR1, with stable and specific binding to GFAP. Both MSR1 exposure and GF AP-specific RNAi knockdown reduce aggregation with remarkably high concordance of aggregate proteins depleted. These data imply that GFAP and its phosphorylation play key roles in neuropathic aggregate accrual and provide valuable new biomarkers, as well as novel therapeutic targets to alleviate, delay, or prevent AD. Full article

(This article belongs to the Special Issue New Insights on Drug Design, Delivery and Targeting in Neurodegeneration)

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Review

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Open AccessReview

Research Models to Study Ferroptosis’s Impact in Neurodegenerative Diseases

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Pharmaceutics 2023, 15(5), 1369; https://doi.org/10.3390/pharmaceutics15051369 - 29 Apr 2023

Viewed by 267

Abstract

Ferroptosis is a type of regulated cell death promoted by the appearance of oxidative perturbations in the intracellular microenvironment constitutively controlled by glutathione peroxidase 4 (GPX4). It is characterized by increased production of reactive oxygen species, intracellular iron accumulation, lipid peroxidation, inhibition of system Xc-, glutathione depletion, and decreased GPX4 activity. Several pieces of evidence support the involvement of ferroptosis in distinct neurodegenerative diseases. In vitro and in vivo models allow a reliable transition to clinical studies. Several in vitro models, including differentiated SH-SY5Y and PC12 cells, among others, have been used to investigate the pathophysiological mechanisms of distinct neurodegenerative diseases, including ferroptosis. In addition, they can be useful in the development of potential ferroptosis inhibitors that can be used as disease-modifying drugs for the treatment of such diseases. On the other hand, in vivo models based on the manipulation of rodents and invertebrate animals, such as Drosophila melanogaster, Caenorhabditis elegans, and zebrafish, have been increasingly used for research in neurodegeneration. This work provides an up-to-date review of the main in vitro and in vivo models that can be used to evaluate ferroptosis in the most prevalent neurodegenerative diseases, and to explore potential new drug targets and novel drug candidates for effective disease-modifying therapies. Full article

(This article belongs to the Special Issue New Insights on Drug Design, Delivery and Targeting in Neurodegeneration)

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Graphical abstract

Open AccessReview

Stimuli-Responsive Nanotherapeutics for Treatment and Diagnosis of Stroke

and

Pharmaceutics 2023, 15(4), 1036; https://doi.org/10.3390/pharmaceutics15041036 - 23 Mar 2023

Viewed by 614

Abstract

Stroke is the second most common medical emergency and constitutes a significant cause of global morbidity. The conventional stroke treatment strategies, including thrombolysis, antiplatelet therapy, endovascular thrombectomy, neuroprotection, neurogenesis, reducing neuroinflammation, oxidative stress, excitotoxicity, hemostatic treatment, do not provide efficient relief to the patients due to lack of appropriate delivery systems, large doses, systemic toxicity. In this context, guiding the nanoparticles toward the ischemic tissues by making them stimuli-responsive can be a turning point in managing stroke. Hence, in this review, we first outline the basics of stroke, including its pathophysiology, factors affecting its development, current treatment therapies, and their limitations. Further, we have discussed stimuli-responsive nanotherapeutics used for diagnosing and treating stroke with challenges ahead for the safe use of nanotherapeutics. Full article

(This article belongs to the Special Issue New Insights on Drug Design, Delivery and Targeting in Neurodegeneration)

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Open AccessReview

Current Advances of Plant-Based Vaccines for Neurodegenerative Diseases

Luis Alberto Bravo-Vázquez

Erick Octavio Mora-Hernández

Alma L. Rodríguez

Padmavati Sahare

Anindya Bandyopadhyay

Asim K. Duttaroy

and

Sujay Paul

Pharmaceutics 2023, 15(2), 711; https://doi.org/10.3390/pharmaceutics15020711 - 20 Feb 2023

Viewed by 1614

Abstract

Neurodegenerative diseases (NDDs) are characterized by the progressive degeneration and/or loss of neurons belonging to the central nervous system, and represent one of the major global health issues. Therefore, a number of immunotherapeutic approaches targeting the non-functional or toxic proteins that induce neurodegeneration in NDDs have been designed in the last decades. In this context, due to unprecedented advances in genetic engineering techniques and molecular farming technology, pioneering plant-based immunogenic antigen expression systems have been developed aiming to offer reliable alternatives to deal with important NDDs, including Alzheimer’s disease, Parkinson’s disease, and multiple sclerosis. Diverse reports have evidenced that plant-made vaccines trigger significant immune responses in model animals, supported by the production of antibodies against the aberrant proteins expressed in the aforementioned NDDs. Moreover, these immunogenic tools have various advantages that make them a viable alternative for preventing and treating NDDs, such as high scalability, no risk of contamination with human pathogens, cold chain free production, and lower production costs. Hence, this article presents an overview of the current progress on plant-manufactured vaccines for NDDs and discusses its future prospects. Full article

(This article belongs to the Special Issue New Insights on Drug Design, Delivery and Targeting in Neurodegeneration)

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