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Dong T, Zhang Z, Li W, Zhuo W, Cui T, Li Z. Synthesis Principle and Practice with Radioactive Iodines and Astatine: Advances Made So Far. J Org Chem 2024; 89:11837-11863. [PMID: 39173032 DOI: 10.1021/acs.joc.4c00593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/24/2024]
Abstract
Radioactive iodines and astatine, possessing distinct exploitable nuclear properties, play indispensable roles in the realms of nuclear imaging and therapy. Their analogous chemical characteristics shape the design, preparation, and substrate range for tracers labeled with these radiohalogens through interconnected radiosynthetic chemistry. This perspective systematically explores the labeling methods by types of halogenating reagents─nucleophilic and electrophilic─underpinning the rational design of such compounds. It delves into the rapidly evolving synthetic strategies and reactions in radioiodination and radioastatination over the past decade, comparing their intrinsic relationships and highlighting variations. This comparative analysis illuminates potential radiosynthetic methods for exploration. Moreover, stability concerns related to compounds labeled with radioactive iodines and astatine are addressed, offering valuable insights for radiochemists and physicians alike.
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Affiliation(s)
- Taotao Dong
- State Key Laboratory of Vaccines for Infectious Diseases, Center for Molecular Imaging and Translational Medicine, Xiang An Biomedicine Laboratory, School of Public Health, Xiamen University, Xiamen, Fujian 361102, China
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integrations in Vaccine Research, Xiamen University, Xiamen, Fujian 361102, China
| | - Zhenru Zhang
- State Key Laboratory of Vaccines for Infectious Diseases, Center for Molecular Imaging and Translational Medicine, Xiang An Biomedicine Laboratory, School of Public Health, Xiamen University, Xiamen, Fujian 361102, China
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integrations in Vaccine Research, Xiamen University, Xiamen, Fujian 361102, China
| | - Weicai Li
- State Key Laboratory of Vaccines for Infectious Diseases, Center for Molecular Imaging and Translational Medicine, Xiang An Biomedicine Laboratory, School of Public Health, Xiamen University, Xiamen, Fujian 361102, China
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integrations in Vaccine Research, Xiamen University, Xiamen, Fujian 361102, China
| | - Weibin Zhuo
- Alpha Nuclide Co., Ltd., Ningbo, Zhejiang 315336, China
| | - Tongjiang Cui
- Alpha Nuclide Co., Ltd., Ningbo, Zhejiang 315336, China
| | - Zijing Li
- State Key Laboratory of Vaccines for Infectious Diseases, Center for Molecular Imaging and Translational Medicine, Xiang An Biomedicine Laboratory, School of Public Health, Xiamen University, Xiamen, Fujian 361102, China
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integrations in Vaccine Research, Xiamen University, Xiamen, Fujian 361102, China
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Ayoub VR, Abdel-Mottaleb MMA, Ibrahem IT, Motaleb MA, Geneidi AS. Novel radioiodinated desvenlafaxine-loaded lipid nanocapsule for brain delivery. Arch Pharm (Weinheim) 2024; 357:e2300618. [PMID: 38161231 DOI: 10.1002/ardp.202300618] [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: 10/24/2023] [Revised: 12/07/2023] [Accepted: 12/11/2023] [Indexed: 01/03/2024]
Abstract
Lipid nanocapsules (LNCs) are lipid nanocarriers developed for drug delivery enhancement. The antidepressant drug desvenlafaxine (DSV) was entrapped in LNC to improve its brain delivery. Different DSV-loaded LNCs formulae using different oils and surfactants were studied to obtain the optimum formula for further studies. In vivo biodistribution studies were done using Swiss albino mice by intravenous injection of DSV-loaded LNCs by radioiodination technique. The optimum DSV-loaded LNC formula was obtained by using Labrafil® M1944CS as the oil and Solutol® HS15 as the surfactant in the ratio of 1:1, with a particle size of 34.28 ± 0.41 nm, a polydispersity index of 0.032 ± 0.05, a zeta potential of -25.77 ± 1.41, and good stability for up to 6 months. The in vivo biodistribution and pharmacokinetics data ensure the bioavailability improvement for DSV brain delivery as Cmax and AUC(1-t) increased more than double for intravenously DSV-loaded LNCs compared with the DSV solution. In conclusion, the results obtained from this study give an insight into the great potential of using DSV-loaded LNC for the enhancement of brain delivery.
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Affiliation(s)
- Veronia R Ayoub
- Department of Labelled Compounds, Hot Labs Center, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Mona M A Abdel-Mottaleb
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
| | - Ismail T Ibrahem
- Department of Labelled Compounds, Hot Labs Center, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Mohamed A Motaleb
- Department of Labelled Compounds, Hot Labs Center, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Ahmed S Geneidi
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
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El-Marakby EM, Fayez H, Motaleb MA, Mansour M. Atorvastatin-loaded cubosome: a repurposed targeted delivery systems for enhanced targeting against breast cancer. Pharm Dev Technol 2024; 29:236-247. [PMID: 38451055 DOI: 10.1080/10837450.2024.2323620] [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: 08/01/2023] [Accepted: 02/22/2024] [Indexed: 03/08/2024]
Abstract
Cancer ranks as one of the most challenging illnesses to deal with because progressive phenotypic and genotypic alterations in cancer cells result in resistance and recurrence. Thus, the creation of novel medications or alternative therapy approaches is mandatory. Repurposing of old drugs is an attractive approach over the traditional drug discovery process in terms of shorter drug development duration, low-cost, highly efficient and minimum risk of failure. In this study Atorvastatin, a statin drug used to treat abnormal cholesterol levels and prevent cardiovascular disease in people at high risk, was introduced and encapsulated in cubic liquid crystals as anticancer candidate aiming at sustaining its release and achieving better cellular uptake in cancer cells. The cubic liquid crystals were successfully prepared and optimized with an entrapment effieciency of 73.57% ±1.35 and particle size around 200 nm. The selected formulae were effectively doped with radioactive iodine 131I to enable the noninvasive visualization and trafficking of the new formulae. The in vivo evaluation in solid tumor bearing mice was conducted for comparing131I-Atorvastatin solution,131I-Atorvastatin loaded cubosome and 131I-Atorvastatin chitosan coated cubosome. The in vivo biodistribution study revealed that tumor radioactivity uptake of 131I-Atorvastatin cubosome and chitosan coated cubosome exhibited high accumulation in tumor tissues (target organ) scoring ID%/g of 5.67 ± 0.2 and 5.03 ± 0.1, respectively 1h post injection compared to drug solution which recorded 3.09 ± 0.05% 1h post injection. Concerning the targeting efficiency, the target/non target ratio for 131I-Atorvastatin chitosan coated cubosome was higher than that of 131I-Atorvastatin solution and 131I ATV-loaded cubosome at all time intervals and recorded T/NT ratio of 2.908 2h post injection.
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Affiliation(s)
- Eman M El-Marakby
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
| | - Hend Fayez
- Labeled Compounds Department, Hot Labs Centre, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - M A Motaleb
- Labeled Compounds Department, Hot Labs Centre, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Mai Mansour
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
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Ibrahim MM, Basalious EB, El-Nabarawi MA, Makhlouf AI, Sayyed ME, Ibrahim IT. Nose to brain delivery of mirtazapine via lipid nanocapsules: Preparation, statistical optimization, radiolabeling, in vivo biodistribution and pharmacokinetic study. Drug Deliv Transl Res 2024:10.1007/s13346-024-01528-7. [PMID: 38376620 DOI: 10.1007/s13346-024-01528-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/22/2024] [Indexed: 02/21/2024]
Abstract
Mirtazapine (MZPc) is an antidepressant drug which is approved by the FDA. It has low bioavailability, which is only 50%, in spite of its rapid absorption when orally administered owing to high first-pass metabolism. This study was oriented towards delivering intranasal (IN) mirtazapine by a direct route to the brain by means of preparing lipid nanocapsules (LNCs) as a targeted drug delivery system. MZP-LNCs were constructed by solvent-free phase inversion temperature technique applying D-Optimal mixture design to study the impact of 3 formulation variables on the characterization of the formulated nanocapsules. Independent variables were percentage of Labrafac oil, percentage of Solutol and percentage of water. Dependent variables were particle size, polydispersity index (PDI), Zeta potential and solubilization capacity. Nanocapsules of the optimized formula loaded with MZP were of spherical shape as confirmed by transmission electron microscopy with particle diameter of 20.59 nm, zeta potential of - 5.71, PDI of 0.223 and solubilization capacity of 7.21 mg/g. The in vivo pharmacokinetic behavior of intranasal MZP-LNCs in brain and blood was correlated to MZP solution after intravenous (IV) and intranasal administration in mice. In vivo biodistribution of the drug in mice was assessed by a radiolabeling technique using radioiodinated mirtazapine (131I-MZP). Results showed that intranasal MZP-LNCs were able to deliver higher amount of MZP to the brain with less drug levels in blood when compared to the MZP solution after IV and IN administration. Moreover, the percentage of drug targeting efficiency (%DTE) of the optimized MZP-LNCs was 332.2 which indicated more effective brain targeting by the intranasal route. It also had a direct transport percentage (%DTP) of 90.68 that revealed a paramount contribution of the nose to brain pathway in the drug delivery to the brain.
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Affiliation(s)
- Mennatullah M Ibrahim
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt.
| | - Emad B Basalious
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Mohamed A El-Nabarawi
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Amal Ia Makhlouf
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, October University for Modern Sciences and Arts (MSA), Cairo, Egypt
| | - Marwa Eid Sayyed
- Radio Labeled Compounds Department, Hot Labs Centre, Egyptian Atomic Energy Authority, P.O. Box 13759, Cairo, Egypt
| | - Ismail Taha Ibrahim
- Radio Labeled Compounds Department, Hot Labs Centre, Egyptian Atomic Energy Authority, P.O. Box 13759, Cairo, Egypt
- Faculty of Pharmacy, Albayan University, Baghdad, Iraq
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Fayez H, Selim A, Shamma R, Rashed H. Intranasal Radioiodinated Ferulic Acid Polymeric Micelles as the First Nuclear Medicine Imaging Probe for ETRA Brain Receptor. Curr Radiopharm 2024; 17:209-217. [PMID: 38213167 DOI: 10.2174/0118744710269885231113070356] [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: 06/30/2023] [Revised: 08/17/2023] [Accepted: 09/27/2023] [Indexed: 01/13/2024]
Abstract
INTRODUCTION The aim of this work was to prepare a selective nuclear medicine imaging probe for the Endothelin 1 receptor A in the brain. MATERIAL AND METHODS Ferulic acid (an ETRA antagonist) was radiolabeled using 131I by direct electrophilic substitution method. The radiolabeled ferulic acid was formulated as polymeric micelles to allow intranasal brain delivery. Biodistribution was studied in Swiss albino mice by comparing brain uptake of 131I-ferulic acid after IN administration of 131I-ferulic acid polymeric micelles, IN administration of 131I-ferulic acid solution and IV administration of 131I-ferulic acid solution. RESULTS Successful radiolabeling was achieved with an RCY of 98 % using 200 μg of ferulic acid and 60 μg of CAT as oxidizing agents at pH 6, room temperature and 30 min reaction time. 131I-ferulic acid polymeric micelles were successfully formulated with the particle size of 21.63 nm and polydispersity index of 0.168. Radioactivity uptake in the brain and brain/blood uptake ratio for I.N 131I-ferulic acid polymeric micelles were greater than the two other routes at all periods. CONCLUSION Our results provide 131I-ferulic acid polymeric micelles as a hopeful nuclear medicine tracer for ETRA brain receptor.
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Affiliation(s)
- Hend Fayez
- Department of Labeled Compounds, Hot Laboratories Center, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Adli Selim
- Department of Labeled Compounds, Hot Laboratories Center, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Rehab Shamma
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, 11561, Egypt
| | - Hassan Rashed
- Department of Labeled Compounds, Hot Laboratories Center, Egyptian Atomic Energy Authority, Cairo, Egypt
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Sinai University, Kantara, Egypt
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Shewaiter MA, Selim AA, Rashed HM, Moustafa YM, Gad S. Niosomal formulation of mefenamic acid for enhanced cancer targeting; preparation, characterization and biodistribution study using radiolabeling technique. J Cancer Res Clin Oncol 2023; 149:18065-18080. [PMID: 37982828 PMCID: PMC10725351 DOI: 10.1007/s00432-023-05482-8] [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: 09/08/2023] [Accepted: 10/18/2023] [Indexed: 11/21/2023]
Abstract
BACKGROUND This work aimed to prepare niosomal formulations of an anticancer agent [mefenamic acid (MEF)] to enhance its cancer targeting. 131I was utilized as a radiolabeling isotope to study the radio-kinetics of MEF niosomes. METHODS niosomal formulations were prepared by the ether injection method and assessed for entrapment efficiency (EE%), zeta potential (ZP), polydispersity index (PDI) and particle size (PS). MEF was labeled with 131I by direct electrophilic substitution reaction through optimization of radiolabeling-related parameters. In the radio-kinetic study, the optimal 131I-MEF niosomal formula was administered intravenously (I.V.) to solid tumor-bearing mice and compared to I.V. 131I-MEF solution as a control. RESULTS the average PS and ZP values of the optimal formulation were 247.23 ± 2.32 nm and - 28.3 ± 1.21, respectively. The highest 131I-MEF labeling yield was 98.7 ± 0.8%. The biodistribution study revealed that the highest tumor uptake of 131I-MEF niosomal formula and 131I-MEF solution at 60 min post-injection were 2.73 and 1.94% ID/g, respectively. CONCLUSION MEF-loaded niosomes could be a hopeful candidate in cancer treatment due to their potent tumor uptake. Such high targeting was attributed to passive targeting of the nanosized niosomes and confirmed by radiokinetic evaluation.
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Affiliation(s)
- Mona A Shewaiter
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Sinai University, Kantara, Egypt
| | - Adli A Selim
- Labeled Compounds Department, Hot Laboratories Center, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Hassan M Rashed
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Sinai University, Kantara, Egypt.
- Labeled Compounds Department, Hot Laboratories Center, Egyptian Atomic Energy Authority, Cairo, Egypt.
| | - Yasser M Moustafa
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt
| | - Shadeed Gad
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt.
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Motaleb MA, Attalah KM, Shweeta HA, Ibrahim IT. Synthesis and biological evaluation of [ 131I]iodocarvedilol as a potential radiopharmaceutical for heart imaging. BMC Chem 2023; 17:21. [PMID: 36922888 PMCID: PMC10018969 DOI: 10.1186/s13065-023-00935-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Accepted: 03/03/2023] [Indexed: 03/17/2023] Open
Abstract
The optimization of the radiolabeling yield of carvedilol with iodine-131 was described. Dependence of the labeling yield of [131I]iodocarvedilol on the concentration of carvedilol, chloramine-T content, pH of the reaction mixture and reaction time was studied in details. Carvedilol was labeled with iodine-131 at pH 6 with a labeling yield of 92.6 ± 2.77% by using 100 µg carvedilol, 200 µg chloramin-T (CAT) and 30 min reaction time. The formed [131I]iodocarvedilol was nearly stable for a time up to one day. Biodistribution of [131I]iodocarvedilol was investigated in experimental animals. [131/123I]iodocarvedilol was located in the heart with a concentration of 19.6 ± 0.41% of the injected dose at 60 min post injection. It has a high heart uptake and heart to liver ratio, both of which are beneficial for high-quality SPECT (single-photon emission computerized tomography) myocardial imaging. [131/123I]iodocarvedilol solve most the drawbacks of the FDA (Food and Drug Administration) approved 99mTc-sestamibi.
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Affiliation(s)
- M A Motaleb
- Labeled Compounds Department, Hot Laboratories Centre, Egyptian Atomic Energy Authority (EAEA), 13759, Cairo, Egypt.
| | - K M Attalah
- Labeled Compounds Department, Hot Laboratories Centre, Egyptian Atomic Energy Authority (EAEA), 13759, Cairo, Egypt
| | - H A Shweeta
- Labeled Compounds Department, Hot Laboratories Centre, Egyptian Atomic Energy Authority (EAEA), 13759, Cairo, Egypt
| | - I T Ibrahim
- Labeled Compounds Department, Hot Laboratories Centre, Egyptian Atomic Energy Authority (EAEA), 13759, Cairo, Egypt
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Mahmoud AF, Aboumanei MH, Abd-Allah WH, Swidan MM, Sakr TM. New frontier radioiodinated probe based on in silico resveratrol repositioning for microtubules dynamic targeting. Int J Radiat Biol 2023; 99:281-291. [PMID: 35549606 DOI: 10.1080/09553002.2022.2078001] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
PURPOSE As the 'de novo' drug discovery faces a highly attrition rates, drug repositioning procures a heighten concern in identifying novel uses for existing medications. This study aimed to fabricate radioiodinated resveratrol as a potent microtubules interfering agent for cancer theragnosis. METHODS Resveratrol was radiolabeled with radioactive iodine where the radioiodination efficiency was enlightened and the computational approaches were employed to investigate the affinity and specificity with tubulins. Furthermore, the in-vivo distribution and pharmacokinetic studies in normal and tumor induced mice were investigated. RESULTS The maximum radioiodination yield (94.6 ± 1.66) was achieved at optimum preparation parameters stated as 100 μg/mL of oxidizing agent, 100 μg/ml of resveratrol, reaction time of 30 min and reaction pH 5. The in silico studies showed that di-iodinated resveratrol (compound 6) exhibited the best binding score (-34.46) and interaction with the β-tubulin binding site. The in vivo distribution in tumor models revealed a significant accumulation (4.02% ID/g) in tumor lesion at 60 min p.i. The rate of drug elimination demonstrated a mono-exponential decline of radioactivity versus time in the blood. CONCLUSION Radioiodinated resveratrol revealed good microtubules targeting which render it as a novel theranostic probe for cancer management.
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Affiliation(s)
- Ashgan F Mahmoud
- Labeled Compounds Department, Hot Labs Center, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Mohamed H Aboumanei
- Labeled Compounds Department, Hot Labs Center, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Walaa Hamada Abd-Allah
- Pharmaceutical Chemistry Department, College of Pharmaceutical Science and Drug Manufacturing, Misr University for Science and Technology, Giza, Egypt
| | - Mohamed M Swidan
- Labeled Compounds Department, Hot Labs Center, Egyptian Atomic Energy Authority, Cairo, Egypt.,Radioisotopes Production Facility, Second Egyptian Research Reactor Complex, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Tamer M Sakr
- Radioisotopes Production Facility, Second Egyptian Research Reactor Complex, Egyptian Atomic Energy Authority, Cairo, Egypt.,Radioactive Isotopes and Generator Department, Hot Labs Center, Egyptian Atomic Energy Authority, Cairo, Egypt
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Shewaiter MA, Selim AA, Moustafa YM, Gad S, Rashed HM. Radioiodinated acemetacin loaded niosomes as a dual anticancer therapy. Int J Pharm 2022; 628:122345. [DOI: 10.1016/j.ijpharm.2022.122345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 10/10/2022] [Accepted: 10/22/2022] [Indexed: 11/07/2022]
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Aboumanei MH, Mahmoud AF. Development of Tamoxifen In Situ Gel Nanoemulsion for Ocular Delivery in Photoreceptor Degeneration Disorder: In Vitro Characterization, 131I-Radiolabeling, and In Vivo Biodistribution Studies. J Pharm Innov 2022. [DOI: 10.1007/s12247-022-09638-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Abstract
Purpose
The aim of our work is to develop an in situ ocular gellan gum–based nanoemulsion (NE) of tamoxifen TAM as an alternative drug delivery system to the oral route for the treatment of photoreceptor degeneration disorder.
Method
Six pseudoternary phase diagrams were developed using oil (oleic acid), surfactants (Tween 80 or Tween 20), a co-surfactant (polyethylene glycol 400), and water. The particle size, polydispersity index, and zeta potential of the developed systems were all measured. The safety of ocular application of the optimum system was established via in vivo histopathological investigation. To track the biodistribution of the optimum gel, iodine-131 (131I) was incorporated into the gel via coupling with TAM via direct electrophilic substitution reaction.
Results
Based on the obtained results, TAMNE-1 was chosen as the optimal system, with PS = 140.20 ± 1.50 nm, ZP = − 27.86 ± 1.13 mV, and PDI = 0.20 ± 0.00%. In vitro release displayed a prolonged and sustained release of TAMNE-1 gel compared to TAM solution (plain eye drop). Transparent in situ TAMNE-1 gel was developed after the incorporation of the TAMNE-1 system into gellan gum aqueous solution (0.3% w/w). In this study, TAM was successfully radiolabeled with 131I for subsequent evaluation of the efficacy of the developed in situ gel system (TAMNE-1 gel) in vivo. The developed TAMNE-1 gel system was nonirritant and safe and the biodistribution studies showed better retention of TAMNE-1 gel than plain TAM eye drops.
Conclusion
The developed TAMNE-1 gel is able to enhance the ocular bioavailability of TAM and can go further with clinical evaluation.
Graphic Abstract
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Chloramine-T (N-chloro-p-toluenesulfonamide sodium salt), a versatile reagent in organic synthesis and analytical chemistry: An up to date review. JOURNAL OF SAUDI CHEMICAL SOCIETY 2022. [DOI: 10.1016/j.jscs.2021.101416] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Aboumanei MH, Mahmoud AF, Motaleb MA. Evaluation of radioiodinated ethopabate as a potential tumor targeting agent. Appl Radiat Isot 2021; 180:110063. [PMID: 34922310 DOI: 10.1016/j.apradiso.2021.110063] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 11/16/2021] [Accepted: 12/09/2021] [Indexed: 11/26/2022]
Abstract
Overexpression of folate synthesis and folate receptor in a wide variety of tumors was reported. As a result, folate derivatives have emerged as a potential candidate for tumor imaging and therapy. Ethopabate is a structural analogue of para-aminobenzoic acid (PABA), a precursor of folic acid. Ethopabate was radiolabeled with radioiodine-131 (131I) via direct electrophilic substitution reaction. Several factors that might affect the radiolabeling yield were studied. Paper chromatography was utilized for testing and evaluation of [131I]iodoethopabate, and HPLC was used as a co-chromatographic tool to confirm the radiochemical yield. The biodistribution of [131I]iodoethopabate in normal and tumor-bearing mice was investigated. The radioiodination of ethopabate resulted in a radiochemical yield of 93.70 ± 0.19%. The biodistribution data revealed that [131I]iodoethopabate was taken up by tumors with promising target/non-target (T/NT) ratios. Where, the tumor to-blood ratios were 3.30 ± 0.40 and 4.06 ± 0.10 at 1 and 4 h post injection, respectively. As a result of these findings, [131I]iodoethopabate appears to have excellent tumor uptake and adequate stability to be used for diagnostic purpose in the future.
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Affiliation(s)
- Mohamed H Aboumanei
- Labeled Compounds Department, Hot Labs Center, Egyptian Atomic Energy Authority, P.O. Box 11371, Cairo, Egypt.
| | - Ashgan F Mahmoud
- Labeled Compounds Department, Hot Labs Center, Egyptian Atomic Energy Authority, P.O. Box 11371, Cairo, Egypt
| | - Mohamed A Motaleb
- Labeled Compounds Department, Hot Labs Center, Egyptian Atomic Energy Authority, P.O. Box 11371, Cairo, Egypt
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Preparation, characterization, and in vivo biodistribution study of intranasal 131I-clonazepam-loaded phospholipid magnesome as a promising brain delivery system: Biodistribution and pharmacokinetic behavior of intranasal 131I-Clonazepam loaded phospholipid magnesome as a potential brain targeting system. Eur J Pharm Sci 2021; 169:106089. [PMID: 34863872 DOI: 10.1016/j.ejps.2021.106089] [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: 07/30/2021] [Revised: 11/03/2021] [Accepted: 11/29/2021] [Indexed: 11/23/2022]
Abstract
OBJECTIVE Clonazepam (CP) is a potent long-acting nitrobenzodiazepine derivative that could be used for targeting peripheral benzodiazepine receptors. Phospholipid magnesome is a new vesicular nanosystem recently developed for brain targeting. Improving the uptake of 131I-CP to the brain might be effective for the diagnosis and/or radiotherapy of certain brain diseases and/or tumors. METHODS CP was radiolabeled with 131I using direct electrophilic substitution reaction. Quality control of 131I-CP was performed using different techniques. Different formulas of 131I-CP were prepared and characterized according to particle size and polydispersity index. The structural features of the optimized formula were then interpreted using transmission electron microscopy and scanning electron microscopy, whereas pharmacokinetic and in vivo behaviors were estimated using the intravenous and intranasal delivery routes. RESULTS The heart and blood demonstrated lower uptake of 131I-CP, which inevitably decreased the nontarget effects of radioiodine. Intranasally administered 131I-CP-loaded magnesomes (INMg) had noticeably higher brain uptake (7.1 ± 0.09%ID/g) with rapid onset of action within 5 min and effective pharmacokinetic behavior. INMg had a drug targeting efficiency and nose-to-brain direct transport percentage of 121.1% and 94.6%, respectively as well as a relative bioavailability of 441.04 ± 75.5%. CONCLUSION The present study showed that 131I-CP-loaded magnesomes can be a beneficial brain-targeting approach for improving the diagnosis and/or radiotherapy of certain brain diseases.
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Selim AA, Essa BM, Abdelmonem IM, Amin MA, Sarhan MO. Extraction, purification and radioiodination of Khellin as cancer theranostic agent. Appl Radiat Isot 2021; 178:109970. [PMID: 34619628 DOI: 10.1016/j.apradiso.2021.109970] [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: 07/16/2021] [Revised: 09/08/2021] [Accepted: 09/27/2021] [Indexed: 10/20/2022]
Abstract
Khellin was successfully extracted from Ammi visnaga fruits with a recovery percent of 96.15%. Next radio-iodination of Khellin was successfully achieved with a high yield. The biodistribution study of [131I]iodo-khellin in tumour bearing mice revealed that khellin preferentially localization at tumour tissue. Target prediction study for [131I]iodo-khellin revealed that PI3K and VEGFR are potential targets for iodo-khellin with good affinity. The results of this study potentiate [131I]iodo-khellin as a good theranostic agent for tumour imaging and therapy.
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Affiliation(s)
- Adli A Selim
- Labeled Compounds Department, Hot Laboratories Centre, Egyptian Atomic Energy Authority (EAEA), Cairo, 13759, Egypt; Radioisotopes Production Facility, Second Egyptian Research Reactor Complex, Egyptian Atomic Energy Authority (EAEA), Cairo, 13759, Egypt.
| | - Basma M Essa
- Radioactive Isotopes and Generator Department, Hot Laboratories Centre, Egyptian Atomic Energy Authority (EAEA), Cairo, 13759, Egypt
| | - Islam M Abdelmonem
- Nuclear Chemistry Department, Hot Laboratories Centre, Egyptian Atomic Energy Authority (EAEA), Cairo, 13759, Egypt
| | - Mohamed A Amin
- Analytical Chemistry Department, Benha University, Benha, 13511, Egypt
| | - Mona O Sarhan
- Labeled Compounds Department, Hot Laboratories Centre, Egyptian Atomic Energy Authority (EAEA), Cairo, 13759, Egypt.
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15
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El Refaye MS, El-Sharawy DM, Hussien H. 125I–Amoxicillin preparation as a guide tracer for inflammation detection. RADIOCHIM ACTA 2021. [DOI: 10.1515/ract-2021-1077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The objective of this study is to label Amoxicillin with radioactive iodine (125I-AC) via direct electrophilic substitution to act as a promising tracer for inflammation imaging. The highest labeling yield of 80% was achieved after studying all the parameters affecting the labeling reaction using Iodogen (IG) as an oxidizing agent. Molecular Modeling Structure was done using MOE program to predict the suitable 125I position. The product structure was established by a cold iodination reaction using Iodine-127. Biological evaluation of (125I-AC) was carried out using groups of inflamed mice with different exogenous agents such as E.Coli and Turpentine oil. The (125I-AC) shows an in vitro stability of about 97% after 24 h.While doing in vivo studies over 4 h, the tracer stability of 99% was observed.
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Affiliation(s)
- Marwa S. El Refaye
- Radioactive Isotopes and Generators Department , Hot Laboratory Center, Egyptian Atomic Energy Authority (EAEA) , P.O. Box 13759 , Cairo , Egypt
- Cyclotron Project, Nuclear Research Centre, Egyptian Atomic Energy Authority (EAEA) , P.O. Box 13759 , Cairo , Egypt
| | - Dina M. El-Sharawy
- Cyclotron Project, Nuclear Research Centre, Egyptian Atomic Energy Authority (EAEA) , P.O. Box 13759 , Cairo , Egypt
- Labeled Compounds Department , Hot Laboratory Center, Egyptian Atomic Energy Authority (EAEA) , P.O. Box 13759 , Cairo , Egypt
- Pharmaceutics and Clinical Pharmacy Department , Faculty of Pharmacy, Nahda University , Beni Suef , Egypt
| | - Heba Hussien
- Cyclotron Project, Nuclear Research Centre, Egyptian Atomic Energy Authority (EAEA) , P.O. Box 13759 , Cairo , Egypt
- Labeled Compounds Department , Hot Laboratory Center, Egyptian Atomic Energy Authority (EAEA) , P.O. Box 13759 , Cairo , Egypt
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16
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Aboumanei MH, Mahmoud AF, Motaleb MA. Formulation of chitosan coated nanoliposomes for the oral delivery of colistin sulfate: in vitro characterization, 99mTc-radiolabeling and in vivo biodistribution studies. Drug Dev Ind Pharm 2021; 47:626-635. [PMID: 33834934 DOI: 10.1080/03639045.2021.1908334] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Colistin sulfate is a very important antibiotic for the treatment of multidrug-resistant Gram-negative infections. Unfortunately, it has low oral bioavailability and several side effects following parenteral administration. The present study aims to develop chitosan-coated colistin nanoliposomes to improve the stability in the gastrointestinal tract and to enhance the oral delivery of colistin. The chitosan-coated colistin nanoliposomes were obtained via thin-film evaporation and electrostatic deposition methods using either Span 60, Tween 65 or Tween 80 as surfactants with different cholesterol: surfactant: soya lecithin ratios. The influence of systems variables was further characterized by vesicle size analysis, zeta potential (ZP), poly dispersibility index (PDI), and also their entrapment efficiency percentage (EE %) was evaluated. Various systems were formed with vesicle sizes in the nano-range, 155.64 ± 12.53 nm to 315.64 ± 15.90 nm, and EE % of 45.2 ± 2.9% to 81.8 ± 2.9%. Moreover, the ZP value of the prepared nanoliposomes switched from a negative to a positive value after chitosan coating. To track the released colistin in vivo, technetium 99m (99mTc) was incorporated into the optimum system (S-3) system via direct coupling with colistin. Chitosan-coated 99mTc-colistin nanoliposome, 99mTc-colistin suspension, and 99mTc-chitosan-coated nanoliposomes (placebo) were administered orally into bacterial infection (Escherichia coli) bearing mice. The biodistribution results showed that chitosan-coated nanoliposome significantly enhanced the bioavailability of colistin compared to colistin suspension (the commercially available). Moreover, the system effectively improved the localization of colistin at the infected muscle. In conclusion, this approach offers a promising tool for enhanced oral delivery of colistin.
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Affiliation(s)
- Mohamed H Aboumanei
- Labeled Compounds Department, Hot Lab Center, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Ashgan F Mahmoud
- Labeled Compounds Department, Hot Lab Center, Egyptian Atomic Energy Authority, Cairo, Egypt
| | - M A Motaleb
- Labeled Compounds Department, Hot Lab Center, Egyptian Atomic Energy Authority, Cairo, Egypt
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17
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Aboumanei MH, Mahmoud AF. Design and development of a proniosomal transdermal drug delivery system of caffeine for management of migraine: In vitro characterization, 131I-radiolabeling and in vivo biodistribution studies. Process Biochem 2020. [DOI: 10.1016/j.procbio.2020.07.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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18
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Intranasal drug delivery of iodo-haloperidol as a radiopharmaceutical brain imaging agent. J Radioanal Nucl Chem 2018. [DOI: 10.1007/s10967-018-6359-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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19
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Radioiodinated esmolol as a highly selective radiotracer for myocardial perfusion imaging: In silico study and preclinical evaluation. Appl Radiat Isot 2018; 137:41-49. [DOI: 10.1016/j.apradiso.2018.03.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 02/26/2018] [Accepted: 03/07/2018] [Indexed: 11/23/2022]
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20
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131 I-trazodone: preparation, quality control and in vivo biodistribution study by intranasal and intravenous routes as a hopeful brain imaging radiopharmaceutical. Rev Esp Med Nucl Imagen Mol 2017. [DOI: 10.1016/j.remnie.2017.09.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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21
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Motaleb M, Ibrahim I, Sayyed M, Awad G. 131 I-trazodone: preparation, quality control and in vivo biodistribution study by intranasal and intravenous routes as a hopeful brain imaging radiopharmaceutical. Rev Esp Med Nucl Imagen Mol 2017; 36:371-376. [DOI: 10.1016/j.remn.2017.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 03/06/2017] [Accepted: 03/08/2017] [Indexed: 11/16/2022]
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22
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99mTc-hexoprenaline and 131I-dapoxetine: preparation, in silico modeling and biological evaluation as promising lung scintigraphy radiopharmaceuticals. J Radioanal Nucl Chem 2017. [DOI: 10.1007/s10967-017-5500-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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23
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24
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Local preparation and evaluation of liquid phase radioimmunoassay for determination of human serum cortisol. J Radioanal Nucl Chem 2017. [DOI: 10.1007/s10967-017-5273-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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25
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Fürjes G, Lelesz B, Tóth GK, Arday A, Szilvássy Z, Varga A, Berényi E, Németh J. Comparative distribution of somatostatin and thrittene bioactive peptides in the central nervous system of rat measured by radioimmunoassay. J Radioanal Nucl Chem 2017. [DOI: 10.1007/s10967-016-5132-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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26
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Lelesz B, Szilvássy Z, Tóth GK, Tóth A, Enyedi A, Felszeghy E, Varga A, Juhász B, Németh J. Radioanalytical methods for the measurement of melanin concentrating hormone (MCH) and detection its receptor in rat tissues. J Radioanal Nucl Chem 2016. [DOI: 10.1007/s10967-016-4952-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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27
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El-Bayoumy ASA, Ebeid NH, EL-Refay GR, Abdel-Hamid FF, Mehany NL, Shadia FA. Biochemical studies on production and evaluation of radioimmunoassay system for follicle stimulating hormone in human serum. J Radioanal Nucl Chem 2016. [DOI: 10.1007/s10967-016-4918-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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28
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Rashed HM, Shamma RN, Basalious EB. Contribution of both olfactory and systemic pathways for brain targeting of nimodipine-loaded lipo-pluronics micelles: in vitro characterization and in vivo biodistribution study after intranasal and intravenous delivery. Drug Deliv 2016; 24:181-187. [PMID: 28156162 PMCID: PMC8241048 DOI: 10.1080/10717544.2016.1236848] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Accepted: 09/12/2016] [Indexed: 11/03/2022] Open
Abstract
Nimodipine (NM) is the only FDA-approved drug for treating subarachnoid hemorrhage induced vasospasm. NM has poor oral bioavailability (5-13%) due to its low aqueous solubility, and extensive first pass metabolism. The objective of this study is to develop radiolabeled NM-loaded LPM and to test its ability prolong its circulation time, reduce its frequency of administration and eventually target it to the brain tissue. NM was radiolabeled with 99mTc by direct labeling method using sodium dithionite. Different reaction conditions that affect the radiolabeling yield were studied. The in vivo pharmacokinetic behavior of the optimum NM-loaded LPM formulation in blood, heart, and brain tissue was compared with NM solution, after intravenous and intranasal administration. Results show that the radioactivity percentage (%ID/g) in the heart of mice following administration of 99mTc-NM loaded LPM were lower compared with that following administration of 99mTc-NM solution, which is greatly beneficial to minimize the cardiovascular side effects. Results also show that the %ID/g in the blood, and brain following intravenous administration of 99mTc-NM-loaded LPM were higher at all sampling intervals compared with that following intravenous administration of 99mTc-NM solution. This would be greatly beneficial for the treatment of neurovascular diseases. The drug-targeting efficiency of NM to the brain after intranasal administration was calculated to be 1872.82%. The significant increase in drug solubility, enhanced drug absorption and the long circulation time of the NM-loaded LPM could be promising to improve nasal and parenteral delivery of NM.
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Affiliation(s)
- Hassan M. Rashed
- Department of Labeled Compounds, Hot Labs. Center, Egyptian Atomic Energy Authority, Cairo, Egypt and
| | - Rehab N. Shamma
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Emad B. Basalious
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
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29
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Nour SA, Abdelmalak NS, Naguib MJ, Rashed HM, Ibrahim AB. Intranasal brain-targeted clonazepam polymeric micelles for immediate control of status epilepticus: in vitro optimization, ex vivo determination of cytotoxicity, in vivo biodistribution and pharmacodynamics studies. Drug Deliv 2016; 23:3681-3695. [PMID: 27648847 DOI: 10.1080/10717544.2016.1223216] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Clonazepam (CZ) is an anti-epileptic drug used mainly in status epilepticus (SE). The drug belongs to Class II according to BCS classification with very limited solubility and high permeability and it suffers from extensive first-pass metabolism. The aim of the present study was to develop CZ-loaded polymeric micelles (PM) for direct brain delivery allowing immediate control of SE. PM were prepared via thin film hydration (TFH) technique adopting a central composite face-centered design (CCFD). The seventeen developed formulae were evaluated in terms of entrapment efficiency (EE), particle size (PS), polydispersity index (PDI), zeta potential (ZP), and in vitro release. For evaluating the in vivo behavior of the optimized formula, both biodistrbution using 99mTc-radiolabeled CZ and pharmacodynamics studies were done in addition to ex vivo cytotoxicty. At a drug:Pluronic® P123:Pluronic® L121 ratio of 1:20:20 (PM7), a high EE, ZP, Q8h, and a low PDI was achieved. The biodistribution studies revealed that the optimized formula had significantly higher drug targeting efficiency (DTE = 242.3%), drug targeting index (DTI = 144.25), and nose-to-brain direct transport percentage (DTP = 99.30%) and a significant prolongation of protection from seizures in comparison to the intranasally administered solution with minor histopathological changes. The declared results reveal the ability of the developed PM to be a strong potential candidate for the emergency treatment of SE.
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Affiliation(s)
- Samia A Nour
- a Department of Pharmaceutics , Faculty of Pharmacy, Cairo University , Cairo , Egypt and
| | - Nevine S Abdelmalak
- a Department of Pharmaceutics , Faculty of Pharmacy, Cairo University , Cairo , Egypt and
| | - Marianne J Naguib
- a Department of Pharmaceutics , Faculty of Pharmacy, Cairo University , Cairo , Egypt and
| | - Hassan M Rashed
- b Labeled Compounds Department, Hot Lab. Center , Egyptian Atomic Energy Authority , Cairo , Egypt
| | - Ahmed B Ibrahim
- b Labeled Compounds Department, Hot Lab. Center , Egyptian Atomic Energy Authority , Cairo , Egypt
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30
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99mTc-zolmitriptan: radiolabeling, molecular modeling, biodistribution and gamma scintigraphy as a hopeful radiopharmaceutical for lung nuclear imaging. Radiol Med 2016; 121:935-943. [DOI: 10.1007/s11547-016-0677-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Accepted: 08/16/2016] [Indexed: 12/18/2022]
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31
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Abd-Elal RMA, Shamma RN, Rashed HM, Bendas ER. Trans-nasal zolmitriptan novasomes: in-vitro preparation, optimization and in-vivo evaluation of brain targeting efficiency. Drug Deliv 2016; 23:3374-3386. [PMID: 27128792 DOI: 10.1080/10717544.2016.1183721] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Migraine attack is a troublesome physiological condition associated with throbbing, intense headache, in one half of the head. Zolmitriptan is a potent second-generation triptan, prescribed for patients with migraine attacks, with or without an aura, and cluster headaches. The absolute bioavailability of zolmitriptan is about 40% for oral administration; due to hepatic first metabolism. Nasal administration would circumvent the pre-systemic metabolism thus increasing the bioavailability of zolmitriptan. In addition, due to the presence of microvilli and high vasculature, the absorption is expected to be faster compared to oral route. However, the bioavailability of nasal administered drugs is particularly restricted by poor membrane penetration. Thus, the aim of this work is to explore the potential of novel nanovesicular fatty acid enriched structures (novasomes) for effective and enhanced nasal delivery of zolmitriptan and investigate their nose to brain targeting potential. Novasomes were prepared using nonionic surfactant, cholesterol in addition to a free fatty acid. A 23 full factorial design was adopted to study the influence of the type of surfactant, type of free fatty acid and ratio between the free fatty acid and the surfactant on novasomes properties. The particle size, entrapment efficiency, polydispersity index, zeta potential and % zolmitriptan released after 2 h were selected as dependent variables. Novasomes were further optimized using Design Expert® software (version 7; Stat-Ease Inc., Minneapolis, MN), and an optimized formulation composed of Span® 80:Cholesterol:stearic acid (in the ratio 1:1:1) was selected. This formulation showed zolmitriptan entrapment of 92.94%, particle size of 149.9 nm, zeta potential of -55.57 mV, and released 48.43% zolmitriptan after 2 h. The optimized formulation was further examined using transmission electron microscope, which revealed non-aggregating multi-lamellar nanovesicles with narrow size distribution. DSC, XRD examination of the optimized formulation confirmed that the drug have been homogeneously dispersed throughout the novasomes in an amorphous state. In-vivo bio-distribution studies of 99mTc radio-labeled intranasal zolmitriptan loaded novasomes were done on mice, the pharmacokinetic parameters were compared with those following administration of intravenous 99mTc-zolmitriptan solution. Results revealed the great enhancement in zolmitriptan targeting to the brain, with drug targeting potential of about 99% following intranasal administration of novasomes compared with the intravenous drug solution. Zolmitriptan loaded novasomes administered via the nasal route may therefore constitute an advance in the management of acute migraine attacks.
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Affiliation(s)
- Radwa M A Abd-Elal
- a Department of Pharmaceutics and Industrial Pharmacy , Modern University for Technology & Information (MTI) , Cairo , Egypt
| | - Rehab N Shamma
- b Department of Pharmaceutics and Industrial Pharmacy , Cairo University , Cairo , Egypt
| | - Hassan M Rashed
- c Labeled Compounds Department, Hot Laboratories Center, Egyptian Atomic Energy Authority , Cairo , Egypt , and
| | - Ehab R Bendas
- d Clinical Pharmacy Department, Future University in Egypt , New Cairo , Egypt
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32
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Swidan MM, Sakr TM, Motaleb MA, Abd El-Bary A, El-Kolaly MT. Preliminary assessment of radioiodinated fenoterol and reproterol as potential scintigraphic agents for lung imaging. J Radioanal Nucl Chem 2014. [DOI: 10.1007/s10967-014-3328-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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