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de Moraes Santos Corrêa É, Christofoletti G, de Souza AS. Effects of Intracerebral Aminophylline Dosing on Catalepsy and Gait in an Animal Model of Parkinson's Disease. Int J Mol Sci 2024; 25:5191. [PMID: 38791229 PMCID: PMC11120906 DOI: 10.3390/ijms25105191] [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: 04/03/2024] [Revised: 05/02/2024] [Accepted: 05/03/2024] [Indexed: 05/26/2024] Open
Abstract
Parkinson's disease (PD) is a progressive disorder characterized by the apoptosis of dopaminergic neurons in the basal ganglia. This study explored the potential effects of aminophylline, a non-selective adenosine A1 and A2A receptor antagonist, on catalepsy and gait in a haloperidol-induced PD model. Sixty adult male Swiss mice were surgically implanted with guide cannulas that targeted the basal ganglia. After seven days, the mice received intraperitoneal injections of either haloperidol (experimental group, PD-induced model) or saline solution (control group, non-PD-induced model), followed by intracerebral infusions of aminophylline. The assessments included catalepsy testing on the bar and gait analysis using the Open Field Maze. A two-way repeated-measures analysis of variance (ANOVA), followed by Tukey's post hoc tests, was employed to evaluate the impact of groups (experimental × control), aminophylline (60 nM × 120 nM × saline/placebo), and interactions. Significance was set at 5%. The results revealed that the systemic administration of haloperidol in the experimental group increased catalepsy and dysfunction of gait that paralleled the observations in PD. Co-treatment with aminophylline at 60 nM and 120 nM reversed catalepsy in the experimental group but did not restore the normal gait pattern of the animals. In the non-PD induced group, which did not present any signs of catalepsy or motor dysfunctions, the intracerebral dose of aminophylline did not exert any interference on reaction time for catalepsy but increased walking distance in the Open Field Maze. Considering the results, this study highlights important adenosine interactions in the basal ganglia of animals with and without signs comparable to those of PD. These findings offer valuable insights into the neurobiology of PD and emphasize the importance of exploring novel therapeutic strategies to improve patient's catalepsy and gait.
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Affiliation(s)
| | | | - Albert Schiaveto de Souza
- Faculty of Medicine, Institute of Health, Federal University of Mato Grosso do Sul, UFMS, Campo Grande 79060-900, Brazil; (É.d.M.S.C.); (G.C.)
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Healthcare Systems across Europe and the US: The Managed Entry Agreements Experience. Healthcare (Basel) 2023; 11:healthcare11030447. [PMID: 36767022 PMCID: PMC9914690 DOI: 10.3390/healthcare11030447] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 12/27/2022] [Accepted: 01/30/2023] [Indexed: 02/09/2023] Open
Abstract
This systematic study aims at analyzing the differences between the approach of the European healthcare systems to the pharmaceutical market and the American one. This paper highlights the opportunities and the limitations given by the application of managed entry agreements (MEAs) in European countries as opposed to the American market, which does not regulate pharmaceutical prices. Data were collected from the Organisation for Economic Co-operation and Development (OECD), the European Medicines Agency, and the national healthcare agencies of US and European countries. A literature review was undertaken in PubMed, Scopus, MEDLINE, and Google for a period ten years (2010-2019). The period 2020-2021 was considered to compare health expenditure before and after the SARS-CoV-2 pandemic. Scarce information from national agencies has been given in terms of MEAs related to the COVID-19 pandemic. The comparison between the United States approach and the European one shows the importance of a market access regulation to reduce the cost of therapies, increasing the efficiency of national healthcare systems and the advantages in terms of quality and accessibility to the final users: patients. Nevertheless, it seems that the golden age of MEAs for Europe was during the examined period. Except for Italy, countries will move to other forms of reimbursements to obtain higher benefits, reducing the costs of an inefficient implementation and outcomes in the medium term.
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Khatri DK, Preeti K, Tonape S, Bhattacharjee S, Patel M, Shah S, Singh PK, Srivastava S, Gugulothu D, Vora L, Singh SB. Nanotechnological Advances for Nose to Brain Delivery of Therapeutics to Improve the Parkinson Therapy. Curr Neuropharmacol 2023; 21:493-516. [PMID: 35524671 PMCID: PMC10207920 DOI: 10.2174/1570159x20666220507022701] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 02/26/2022] [Accepted: 04/21/2022] [Indexed: 11/22/2022] Open
Abstract
Blood-Brain Barrier (BBB) acts as a highly impermeable barrier, presenting an impediment to the crossing of most classical drugs targeted for neurodegenerative diseases including Parkinson's disease (PD). About the nature of drugs and other potential molecules, they impose unavoidable doserestricted limitations eventually leading to the failure of therapy. However, many advancements in formulation technology and modification of delivery approaches have been successful in delivering the drug to the brain in the therapeutic window. The nose to the brain (N2B) drug delivery employing the nanoformulation, is one such emerging delivery approach, overcoming both classical drug formulation and delivery-associated limitations. This latter approach offers increased bioavailability, greater patient acceptance, lesser metabolic degradation of drugs, circumvention of BBB, ample drug loading along with the controlled release of the drugs. In N2B delivery, the intranasal (IN) route carries therapeutics firstly into the nasal cavity followed by the brain through olfactory and trigeminal nerve connections linked with nasal mucosa. The N2B delivery approach is being explored for delivering other biologicals like neuropeptides and mitochondria. Meanwhile, this N2B delivery system is associated with critical challenges consisting of mucociliary clearance, degradation by enzymes, and drug translocations by efflux mechanisms. These challenges finally culminated in the development of suitable surfacemodified nano-carriers and Focused- Ultrasound-Assisted IN as FUS-IN technique which has expanded the horizons of N2B drug delivery. Hence, nanotechnology, in collaboration with advances in the IN route of drug administration, has a diversified approach for treating PD. The present review discusses the physiology and limitation of IN delivery along with current advances in nanocarrier and technical development assisting N2B drug delivery.
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Affiliation(s)
- Dharmendra K. Khatri
- Department of Pharmacology & Toxicology, National Institute of Pharmaceutical Education and Research, Hyderabad, Telangana State, India
| | - Kumari Preeti
- Department of Pharmacology & Toxicology, National Institute of Pharmaceutical Education and Research, Hyderabad, Telangana State, India
| | - Shivraj Tonape
- Department of Pharmacology & Toxicology, National Institute of Pharmaceutical Education and Research, Hyderabad, Telangana State, India
| | - Sheoshree Bhattacharjee
- Department of Pharmacology & Toxicology, National Institute of Pharmaceutical Education and Research, Hyderabad, Telangana State, India
| | - Monica Patel
- Department of Pharmacology & Toxicology, National Institute of Pharmaceutical Education and Research, Hyderabad, Telangana State, India
| | - Saurabh Shah
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, Hyderabad, Telangana State, India
| | - Pankaj K. Singh
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, Hyderabad, Telangana State, India
| | - Saurabh Srivastava
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, Hyderabad, Telangana State, India
| | - Dalapathi Gugulothu
- Department of Pharmaceutics, Delhi Pharmaceutical Sciences and Research University (DPSRU), New Delhi-110017, India
| | - Lalitkumar Vora
- School of Pharmacy, Queen's University Belfast, 97 Lisburn Road, Belfast-BT9 7BL, UK
| | - Shashi B. Singh
- Department of Pharmacology & Toxicology, National Institute of Pharmaceutical Education and Research, Hyderabad, Telangana State, India
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Prodrug Therapies for Infectious and Neurodegenerative Diseases. Pharmaceutics 2022; 14:pharmaceutics14030518. [PMID: 35335894 PMCID: PMC8953076 DOI: 10.3390/pharmaceutics14030518] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 02/17/2022] [Accepted: 02/22/2022] [Indexed: 02/06/2023] Open
Abstract
Prodrugs are bioreversible drug derivatives which are metabolized into a pharmacologically active drug following chemical or enzymatic modification. This approach is designed to overcome several obstacles that are faced by the parent drug in physiological conditions that include rapid drug metabolism, poor solubility, permeability, and suboptimal pharmacokinetic and pharmacodynamic profiles. These suboptimal physicochemical features can lead to rapid drug elimination, systemic toxicities, and limited drug-targeting to disease-affected tissue. Improving upon these properties can be accomplished by a prodrug design that includes the careful choosing of the promoiety, the linker, the prodrug synthesis, and targeting decorations. We now provide an overview of recent developments and applications of prodrugs for treating neurodegenerative, inflammatory, and infectious diseases. Disease interplay reflects that microbial infections and consequent inflammation affects neurodegenerative diseases and vice versa, independent of aging. Given the high prevalence, personal, social, and economic burden of both infectious and neurodegenerative disorders, therapeutic improvements are immediately needed. Prodrugs are an important, and might be said a critical tool, in providing an avenue for effective drug therapy.
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Di Stefano A, Marinelli L. Advances in Parkinson's Disease Drugs. Biomolecules 2021; 11:biom11111640. [PMID: 34827638 PMCID: PMC8615848 DOI: 10.3390/biom11111640] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 11/03/2021] [Indexed: 12/15/2022] Open
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Fattahi N, Ramazani A, Hamidi M, Parsa M, Rostamizadeh K, Rashidzadeh H. Enhancement of the brain delivery of methotrexate with administration of mid-chain ester prodrugs: In vitro and in vivo studies. Int J Pharm 2021; 600:120479. [PMID: 33722757 DOI: 10.1016/j.ijpharm.2021.120479] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2020] [Revised: 03/05/2021] [Accepted: 03/07/2021] [Indexed: 02/07/2023]
Abstract
In the present study, with the aim of improving the permeability of methotrexate (MTX) to the brain, the lipophilic MTX prodrugs containing the ester functional moiety were synthesized. The chemical structure of synthesized prodrugs was characterized and confirmed by FT-IR, NMR and mass spectral studies. Based on the results of in vitro cytotoxic studies, all of the synthesized prodrugs led to decrease in the IC50 in 72 h on U87 cancer cell line and the best result was observed for dihexyl methotrexate (MTX-DH) in comparison with free MTX, which led to decrease the IC50 amount up to 6 folds. In addition, in vivo toxicity on Artemia salina (A. salina) showed that the lipophilic MTX prodrugs have been able to partially mask the toxic profile of free MTX, at the same concentrations. These findings were also in compliance with hemolysis assay results, which confirm that the conjugates has not made the drug more toxic. Furthermore, in vivo study in rat model, was employed to determine the simultaneous drug concentration in brain and plasma. According to the obtained results, the brain-to-plasma concentration ratios (Kp values) of MTX-DH and dioctyl methotrexate (MTX-DO) groups were significantly higher compared with free MTX. Moreover, the uptake clearance of MTX by brain parenchyma increased significantly (3.85 and 9.08-time increased for MTX-DH and MTX-DO prodrugs, respectively). These findings indicate that the synthesized lipophilic MTX prodrugs are non-toxic and able to enhance brain penetration of MTX.
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Affiliation(s)
- Nadia Fattahi
- Department of Chemistry, Faculty of Science, University of Zanjan, Zanjan 45371-38791, Iran; Department of Pharmaceutics, School of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran; Trita Nanomedicine Research Center (TNRC), Trita Third Millennium Pharmaceuticals, 45331-55681 Zanjan, Iran
| | - Ali Ramazani
- Department of Chemistry, Faculty of Science, University of Zanjan, Zanjan 45371-38791, Iran; Department of Biotechnology, Research Institute of Modern Biological Techniques (RIMBT), University of Zanjan, Zanjan 45371-38791, Iran; Department of Agronomy, Research Institute of Modern Biological Techniques (RIMBT), University of Zanjan, Zanjan 45371-38791, Iran; Department of Animal Science, Research Institute of Modern Biological Techniques (RIMBT), University of Zanjan, Zanjan 45371-38791, Iran.
| | - Mehrdad Hamidi
- Department of Pharmaceutics, School of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran; Trita Nanomedicine Research Center (TNRC), Trita Third Millennium Pharmaceuticals, 45331-55681 Zanjan, Iran; Zanjan Pharmaceutical Nanotechnology Research Center (ZPNRC), Zanjan University of Medical Sciences, Zanjan, Iran; Department of Pharmaceutical Nanotechnology, School of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran.
| | - Maliheh Parsa
- Department of Toxicology and Pharmacology, Faculty of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran; Cancer Gene Therapy Research Center, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Kobra Rostamizadeh
- Department of Medicinal Chemistry, School of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran; Department of Pharmaceutical Biomaterials, School of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Hamid Rashidzadeh
- Department of Pharmaceutical Biomaterials, School of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran
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Urso D, Chaudhuri KR, Qamar MA, Jenner P. Improving the Delivery of Levodopa in Parkinson's Disease: A Review of Approved and Emerging Therapies. CNS Drugs 2020; 34:1149-1163. [PMID: 33146817 DOI: 10.1007/s40263-020-00769-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 09/26/2020] [Indexed: 01/28/2023]
Abstract
Levodopa is the most effective drug for the treatment of Parkinson's disease, but its use as an oral medication is complicated by its erratic absorption, extensive metabolism and short plasma half-life. On long-term use and with disease progression, there is a high incidence of motor and non-motor complications, which remain a major clinical and research challenge. It is widely accepted that levodopa needs to be administered using formulations that result in good and consistent bioavailability and the physiologically relevant and continuous formation of dopamine in the brain to maximise its efficacy while avoiding and reversing 'wearing off' and dyskinesia. However, the physicochemical properties of levodopa along with its pharmacokinetic and pharmacodynamic profile make it difficult to deliver the drug in a manner that fulfils these criteria. In this review, we examine the problems associated with the administration of levodopa in Parkinson's disease and how the use of novel technologies and delivery devices is leading to a more consistent and sustained levodopa delivery with the aim of controlling motor function as well as non-motor symptoms.
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Affiliation(s)
- Daniele Urso
- Department of Neurosciences, King's College London, Institute of Psychiatry, Psychology and Neuroscience, De Crespigny Park, London, SE5 8AF, UK. .,Parkinson's Foundation Centre of Excellence, King's College Hospital, Denmark Hill, London, UK.
| | - K Ray Chaudhuri
- Department of Neurosciences, King's College London, Institute of Psychiatry, Psychology and Neuroscience, De Crespigny Park, London, SE5 8AF, UK.,Parkinson's Foundation Centre of Excellence, King's College Hospital, Denmark Hill, London, UK
| | - Mubasher A Qamar
- Department of Neurosciences, King's College London, Institute of Psychiatry, Psychology and Neuroscience, De Crespigny Park, London, SE5 8AF, UK.,Parkinson's Foundation Centre of Excellence, King's College Hospital, Denmark Hill, London, UK
| | - Peter Jenner
- Institute of Pharmaceutical Sciences, Faculty of Life Sciences and Medicine, King's College, London, UK
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Prodrugs in combination with nanocarriers as a strategy for promoting antitumoral efficiency. Future Med Chem 2019; 11:2131-2150. [DOI: 10.4155/fmc-2018-0388] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Prodrug entrapment into nanocarriers for tumor delivery is a strategy to achieve a valid therapy with high efficiency. The prodrug contains anticancer agents conjugating with functional moieties or ligands so that the active component is released after metabolism in the body or tumor. The advantages of nanosystems for loading prodrugs include high loading, increased prodrug stability, improved bioavailability and enhanced targeting to tumor cells. In the present article, we introduce the prodrug delivery approaches according to nanomedicine and the recent advances in prodrug-loaded nanocarriers. First, we discuss the conceptional design of combined prodrugs and nanocarriers in response to the obstruction in anticancer therapy. Then we describe the cases of prodrug-loaded nanoparticles for cancer treatment during the past 5 years.
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Jiho Y, Kurihara R, Kawai K, Yamada H, Uto Y, Tanabe K. Enzymatic activation of indolequinone-substituted 5-fluorodeoxyuridine prodrugs in hypoxic cells. Bioorg Med Chem Lett 2019; 29:1304-1307. [PMID: 30975626 DOI: 10.1016/j.bmcl.2019.04.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2019] [Revised: 03/22/2019] [Accepted: 04/03/2019] [Indexed: 10/27/2022]
Abstract
Among the various enzymes, reductases that catalyze one-electron reduction are involved in the selective activation of functional compounds or materials in hypoxia, which is one of the well-known pathophysiological characteristics of solid tumors. Enzymatic one-electron reduction has been recognized as a useful reaction that can be applied in the design of tumor hypoxia-targeting drugs. In this report, we characterized the enzymatic reaction of 5-fluorodeoxyuridine (FdUrd) prodrug bearing an indolequinone unit (IQ-FdUrd), which is a substrate of reductases. IQ-FdUrd was activated to release FdUrd under hypoxic conditions after treatment with cytochrome NADPH P450 reductase. We also confirmed that IQ-FdUrd showed selective cytotoxicity in hypoxic tumor cells.
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Affiliation(s)
- Yota Jiho
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara 252-5258, Japan
| | - Ryohsuke Kurihara
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara 252-5258, Japan
| | - Kiyohiko Kawai
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan
| | - Hisatsugu Yamada
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijyosanjima-cho, Tokushima 770-8506, Japan
| | - Yoshihiro Uto
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijyosanjima-cho, Tokushima 770-8506, Japan
| | - Kazuhito Tanabe
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara 252-5258, Japan
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Rusiecka I, Ruczyński J, Kozłowska A, Backtrog E, Mucha P, Kocić I, Rekowski P. TP10-Dopamine Conjugate as a Potential Therapeutic Agent in the Treatment of Parkinson's Disease. Bioconjug Chem 2019; 30:760-774. [PMID: 30653302 DOI: 10.1021/acs.bioconjchem.8b00894] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Parkinson's disease (PD) is a common progressive neurodegenerative disorder for which the current treatment is not fully satisfactory. One of the major drawbacks of current PD therapy is poor penetration of drugs across the blood-brain barrier (BBB). In recent years, cell-penetrating peptides (CPPs) such as Tat, SynB, or TP10 have gained great interest due to their ability to penetrate cell membranes and to deliver different cargos to their targets including the central nervous system (CNS). However, there is no data with respect to the use of CPPs as drug carriers to the brain for the treatment of PD. In the presented research, the covalent TP10-dopamine conjugate was synthesized and its pharmacological properties were characterized in terms of its ability to penetrate the BBB and anti-parkinsonian activity. The results showed that dopamine (DA) in the form of a conjugate with TP10 evidently gained access to the brain tissue, exhibited low susceptibility to O-methylation reaction by catechol- O-methyltransferase (lower than that of DA), possessed a relatively high affinity to both dopamine D1 and D2 receptors (in the case of D1, a much higher than that of DA), and showed anti-parkinsonian activity (higher than that of l-DOPA) in the MPTP-induced preclinical animal model of PD. The presented results prove that the conjugation of TP10 with DA may be a good starting point for the development of a new strategy for the treatment of PD.
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Affiliation(s)
- Izabela Rusiecka
- Department of Pharmacology , Medical University of Gdańsk , Dębowa 23 , 80-204 Gdańsk , Poland
| | - Jarosław Ruczyński
- Faculty of Chemistry , University of Gdańsk , Wita Stwosza 63 , 80-308 Gdańsk , Poland
| | - Agnieszka Kozłowska
- Faculty of Chemistry , University of Gdańsk , Wita Stwosza 63 , 80-308 Gdańsk , Poland
| | - Ewelina Backtrog
- Faculty of Chemistry , University of Gdańsk , Wita Stwosza 63 , 80-308 Gdańsk , Poland
| | - Piotr Mucha
- Faculty of Chemistry , University of Gdańsk , Wita Stwosza 63 , 80-308 Gdańsk , Poland
| | - Ivan Kocić
- Department of Pharmacology , Medical University of Gdańsk , Dębowa 23 , 80-204 Gdańsk , Poland
| | - Piotr Rekowski
- Faculty of Chemistry , University of Gdańsk , Wita Stwosza 63 , 80-308 Gdańsk , Poland
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Qu J, Lu J, Hu Y. Research and development of anti-Parkinson's drugs: an analysis from the perspective of technology flows measured by patent citations. Expert Opin Ther Pat 2019; 29:127-135. [PMID: 30632414 DOI: 10.1080/13543776.2019.1567712] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
INTRODUCTION By 2020, nearly one million people will live with Parkinson's disease (PD) in the U.S. This disorder has a significant impact on patients' quality of life and is a burden on families and society. Protracted efforts have been made to treat the disease. Cumulative technological innovations are encapsulated by patents, and patent citations have been used to analyze technology diffusion processes in R&D, which is essential to identifying technology evolution trends and providing a review of PD treatment from the perspective of technology flows. AREAS COVERED A patent citation network was utilized to analyze technology flows. Patents related to anti-PD drugs were collected from the U.S. Patent and Trademark Office (U.S. PTO) database. A total of 1,231 patents and 2,995 internal citations granted between 1988 and 2017 were included and analyzed. EXPERT OPINION To launch drugs with greater efficiency and safety, approaches such as long-acting sustained release, controlled osmotic release, and other novel drug delivery systems should be emphasized. Multi-target agents could effectively reduce side effects in mono-drug therapy and are worth further exploration. Investors should keep an eye on alpha-synuclein-related therapy, gene therapy, and other experimental therapies that might trigger a historic revolution in the treatment domain.
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Affiliation(s)
- Jingwen Qu
- a State Key Laboratory of Quality Research in Chinese Medicine , Institute of Chinese Medical Sciences, University of Macau , Taipa , China
| | - Jiahong Lu
- a State Key Laboratory of Quality Research in Chinese Medicine , Institute of Chinese Medical Sciences, University of Macau , Taipa , China
| | - Yuanjia Hu
- a State Key Laboratory of Quality Research in Chinese Medicine , Institute of Chinese Medical Sciences, University of Macau , Taipa , China
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