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Osman NA, Soltan MK, Rezq S, Flaherty J, Romero DG, Abdelkhalek AS. Dual COX-2 and 15-LOX inhibition study of novel 4-arylidine-2-mercapto-1-phenyl-1H-imidazolidin-5(4H)-ones: Design, synthesis, docking, and anti-inflammatory activity. Arch Pharm (Weinheim) 2024:e2300615. [PMID: 38315093 DOI: 10.1002/ardp.202300615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Revised: 12/12/2023] [Accepted: 01/10/2024] [Indexed: 02/07/2024]
Abstract
Novel arylidene-5(4H)-imidazolone derivatives 4a-r were designed and evaluated as multidrug-directed ligands, that is, inflammatory, proinflammatory mediators, and reactive oxygen species (ROS) inhibitors. All of the tested compounds showed cyclooxygenase (COX)-1 inhibitory effect more than celecoxib and less than indomethacin and also demonstrated an improved inhibitory activity against 15-lipoxygenase (15-LOX). Compounds 4f, 4l, and 4p exhibited COX-2 selectivity comparable to that of celecoxib, while 4k was the most selective COX-2 inhibitor. Interestingly, the screened results showed that compound 4k exhibited a superior inhibition effect against 15-LOX and was found to be the most selective COX-2 inhibitor over celecoxib, whereas compound 4f showed promising COX-2 and 15-LOX inhibitory activities besides its inhibitory effect against ROS production and its lowering effect of both tumor necrosis factor-α and interleukin-6 levels by ∼80%. Moreover, compound 4f attenuated the lipopolysaccharide-mediated increase in NF-κB activation in RAW 264.7 macrophages. The preferred binding affinity of these molecules was confirmed by docking studies. We conclude that arylidene-5(4H)-imidazolone scaffolds provide promising hits for developing new synthons with anti-inflammatory and antioxidant activities.
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Affiliation(s)
- Nermine A Osman
- Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Mostafa K Soltan
- Department of Medicinal Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
- Oman College of Health Sciences, Muscat, Oman
| | - Samar Rezq
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi, USA
- Mississippi Center of Excellence in Perinatal Research, University of Mississippi Medical Center, Jackson, Mississippi, USA
- Women's Health Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA
- Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - Joseph Flaherty
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi, USA
- Mississippi Center of Excellence in Perinatal Research, University of Mississippi Medical Center, Jackson, Mississippi, USA
- Women's Health Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA
- Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - Damian G Romero
- Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi, USA
- Mississippi Center of Excellence in Perinatal Research, University of Mississippi Medical Center, Jackson, Mississippi, USA
- Women's Health Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA
- Cardiovascular-Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - Ahmed S Abdelkhalek
- Department of Medicinal Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
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Osman NA, El-Sayed NS, Abdel Fattah HA, Almalki AJ, Kammoun AK, Ibrahim TS, Alharbi AS, Al-Mahmoudy AM. Design, Synthesis and Anticancer Evaluation of New 1-allyl-4-oxo-6-(3,4,5- trimethoxyphenyl)-1,4-dihydropyrimidine-5-carbonitrile Bearing Pyrazole Moieties. Curr Org Synth 2023; 20:897-909. [PMID: 36941818 DOI: 10.2174/1570179420666230320153649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 01/09/2023] [Accepted: 01/17/2023] [Indexed: 03/23/2023]
Abstract
AIM pyrimidine and pyrazole have various biological and pharmaceutical applications such as antibacterial, antifungal, antileishmanial, anti-inflammatory, antitumor, and anti-cancer. INTRODUCTION In this search, the goal is to prepare pyrimidine-pyrazoles and study their anticancer activity. METHODS 1-allyl-4-oxo-6-(3,4,5-trimethoxyphenyl)-1,4-dihydropyrimidine-5-carbonitrile bearing pyrazoles (4,6-8) have been synthesized. Firstly, the reaction of 1-allyl-2-(methylthio)-4-oxo-6- (3,4,5-trimethoxyphenyl)-1,4-dihydropyrimidine-5-carbonitrile (1) with chalcones 2a-b produced the intermediates 3a-b. The latter was reacted with hydrazine hydrate to give the targets 4a-b. On the other hand, hydrazinolysis of compound 1 yielded the hydrazino derivative 5 which upon reaction with chalcones 2c-i or 1,3-bicarbonyl compounds afforded the compounds 6-8. Finally, the new compounds were characterized by spectral data (IR, 1H NMR, 13C NMR) and elemental analysis. Moreover, they were evaluated for Panc-1, MCF-7, HT-29, A-549, and HPDE cell lines as anticancer activity. RESULTS All the tested compounds 3,4,6-8 showed IC50 values > 50 μg/mL against the HPDE cell line. Compounds 6a and 6e exhibited potent anticancer activity where the IC50 values in the range of 1.7- 1.9, 1.4-182, 1.75-1.8, and 1.5-1.9 μg/mL against Panc-1, MCF-7, HT-29, and A-549 cell lines. CONCLUSION New pyrimidine-pyrazole derivatives were simply synthesized, in addition, some of them showed potential anticancer activity.
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Affiliation(s)
- Nermine A Osman
- Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Zagazig, University, Zagazig, 44519, Egypt
| | - Nermine S El-Sayed
- Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Zagazig, University, Zagazig, 44519, Egypt
- Mansoura University Hospital, Mansoura University, Mansoura, Egypt
| | - Hanan A Abdel Fattah
- Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Zagazig, University, Zagazig, 44519, Egypt
| | - Ahmad J Almalki
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - Ahmed K Kammoun
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - Tarek S Ibrahim
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - Abdulrahman S Alharbi
- Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Amany M Al-Mahmoudy
- Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Zagazig, University, Zagazig, 44519, Egypt
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Hamoud MMS, Osman NA, Rezq S, A A Abd El-Wahab H, E A Hassan A, Abdel-Fattah HA, Romero DG, Ghanim AM. Design and Synthesis of Novel 1,3,4-Oxadiazole and 1,2,4-Triazole Derivatives as Cyclooxygenase-2 Inhibitors with Anti-inflammatory and Antioxidant activity in LPS-stimulated RAW264.7 Macrophages. Bioorg Chem 2022; 124:105808. [PMID: 35447409 PMCID: PMC10965220 DOI: 10.1016/j.bioorg.2022.105808] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 03/12/2022] [Accepted: 04/10/2022] [Indexed: 02/07/2023]
Abstract
In an attempt to obtain new candidates with potential anti-inflammatory activity, two series of 1,3,4-oxadiazole based derivatives (8a-g) and 1,2,4-triazole based derivatives (10a,b and 11a-g) were synthesized and evaluated for their COX-1/COX-2 inhibitory activity. In vitro assays showed potent COX-2 inhibitory activity and selectivity of the novel designed compounds (IC50 = 0.04 - 0.16 μM, SI = 60.71 - 337.5) compared to celecoxib (IC50 = 0.045 μM, SI = 326.67). The anti-inflammatory and antioxidant activity of the synthesized compounds was investigated via testing their ability to inhibit pro-inflammatory [tumour necrosis factor (TNF-α) and interleukin-6 (IL-6)] and oxidative stress [nitric oxide (NO) and reactive oxygen species (ROS)] markers production in lipopolysaccharide (LPS)-activated RAW 264.7 macrophages. Most of the novel compounds exhibited potent anti-inflammatory and antioxidant activity. In particular, the novel compounds showed excellent IL-6 inhibitory activity (IC50 = 0.96 - 11.14 μM) when compared to celecoxib (IC50 = 13.04 μM) and diclofenac sodium (IC50 = 22.97 μM). Moreover, the most potent and selective COX-2 inhibitor 11c (IC50 = 0.04 μM, SI = 337.5) displayed significantly higher activity against NO and ROS production compared to celecoxib (IC50 = 2.60 and 3.01 μM vs. 16.47 and 14.30 μM, respectively). Molecular modelling studies of the novel designed molecules into COX-2 active sites analysed their binding affinity. In-silico simulation studies indicated their acceptable physicochemical properties and pharmacokinetic profiles. This study suggests that the novel synthesized COX-2 inhibitors exert potent anti-inflammatory and antioxidant activity, highlighting their potential as promising therapeutic agents for the treatment of inflammation and oxidative stress-related diseases.
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Affiliation(s)
- Mohamed M S Hamoud
- Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig 44519, Egypt
| | - Nermine A Osman
- Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig 44519, Egypt
| | - Samar Rezq
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Zagazig University, Egypt; Department of Cell and Molecular Biology, University of Mississippi Medical Center, Jackson, MS, USA; Mississippi Center for Excellence in Perinatal Research, University of Mississippi Medical Center, Jackson, MS, USA; Women's Health Research Center, University of Mississippi Medical Center, Jackson, MS, USA; Cardio Renal Research Center, University of Mississippi Medical Center, Jackson, MS, USA
| | - Hend A A Abd El-Wahab
- Department of Medicinal Chemistry, Faculty of Pharmacy, Assiut University, Assiut, Egypt
| | - Abdalla E A Hassan
- Department of Chemistry, Faculty of Science, Zagazig University, Zagazig 44519, Egypt
| | - Hanan A Abdel-Fattah
- Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig 44519, Egypt
| | - Damian G Romero
- Department of Cell and Molecular Biology, University of Mississippi Medical Center, Jackson, MS, USA; Mississippi Center for Excellence in Perinatal Research, University of Mississippi Medical Center, Jackson, MS, USA; Women's Health Research Center, University of Mississippi Medical Center, Jackson, MS, USA; Cardio Renal Research Center, University of Mississippi Medical Center, Jackson, MS, USA
| | - Amany M Ghanim
- Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig 44519, Egypt.
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Abo-Dya NE, Agha KA, Abbas HA, Abu-Kull ME, Alahmdi MI, Osman NA. Hybrid N-Acylcysteines as Dual-Acting Matrix Disruptive and Anti-Quorum Sensing Agents Fighting Pseudomonas aeruginosa Biofilms: Design, Synthesis, Molecular Docking Studies, and In Vitro Assays. ACS Omega 2022; 7:19879-19891. [PMID: 35721927 PMCID: PMC9202021 DOI: 10.1021/acsomega.2c01667] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Accepted: 05/24/2022] [Indexed: 05/12/2023]
Abstract
Biofilms facilitate the pathogenesis of life-threatening Pseudomonas aeruginosa infections by coating mucosal surfaces or invasive devices and offer protection from antimicrobial therapy and the host immune response, thus increasing mortality rates and financial burden. Herein, new hybrid N-acylcysteines (NAC) incorporating selected acyl groups from organic acids and their derivatives, which are capable of quenching pathogen quorum sensing (QS) systems, were designed and their antibiofilm activity and anti-QS were evaluated. N-acylcysteines (4a-h) were synthesized and characterized by 1H NMR and 13C NMR, and their purity was confirmed by elemental analyses. N-(4-Hydroxy-3,5-dimethoxybenzoyl)-l-cysteine (4d) and N-(4-methoxybenzoyl)-l-cysteine (4h) showed a higher antibiofilm activity against PAO1 biofilms than the rest of the targets and the standard NAC. They showed 83 and 82% inhibition of biofilms at 5 mM and eradicated mature biofilms at 20 mM concentrations (NAC biofilm inhibition = 66% at 10 mM and minimum biofilm eradication concentration = 40 mM). This was confirmed via visualizing adherent biofilm cells on catheter pieces using scanning electron microscopy. In the same vein, both 4d and 4h showed the highest docking score with the QS signal receptor protein LasR (-7.8), which was much higher than that of NAC (-5) but less than the score of the natural agonist N-(3-oxododecanoyl)-l-homoserine (OdDHL) (-8.5). Target 4h (5 mM) decreased the expression of quorum sensing encoding genes in P. aeruginosa PAO1 strain by 53% for pslA, 47% for lasI and lasR, and 29% for filC, lowered PAO1 pyocyanin production by 76.43%, completely blocked the proteolytic activity of PAO1, and did not affect PAO1 cell viability. Targets 4d and 4h may find applications for the prevention and treatment of biofilm-mediated P. aeruginosa local infections of the skin, eye, and wounds. N-(4-Methoxybenzoyl)-l-cysteine 4h is a promising dual-acting matrix disruptive and anti-QS antibiofilm agent for further investigation and optimization.
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Affiliation(s)
- Nader E. Abo-Dya
- Department
of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Tabuk, Tabuk 71491, Saudi Arabia
- Department
of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig 44519, Egypt
- ,
| | - Khalid A. Agha
- Department
of Organic and Medicinal Chemistry, Faculty of Pharmacy, Fayoum University, Fayoum 63514, Egypt
| | - Hisham A. Abbas
- Department
of Microbiology and Immunology, Faculty of Pharmacy, Zagazig University, Zagazig 44519, Egypt
| | - Mansour E. Abu-Kull
- Department
of Medicinal Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig 44519, Egypt
| | - Mohammed Issa Alahmdi
- Department
of Chemistry, Faculty of Science, University
of Tabuk, Tabuk 71491, Saudi Arabia
| | - Nermine A. Osman
- Department
of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig 44519, Egypt
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Hamoud MMS, Pulya S, Osman NA, Bobde Y, Hassan AEA, Abdel-Fattah HA, Ghosh B, Ghanim AM. Design, synthesis, and biological evaluation of novel nicotinamide derivatives as potential histone deacetylase-3 inhibitors. NEW J CHEM 2020. [DOI: 10.1039/d0nj01274b] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The selected nicotinamide-based HDACi displayed selectivity towards HDAC3 over pan HDAC and exhibited potent cytotoxicity against the used cell lines.
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Affiliation(s)
- Mohamed M. S. Hamoud
- Department of Pharmaceutical Organic Chemistry
- Faculty of Pharmacy
- Zagazig University
- Zagazig 44519
- Egypt
| | - Sravani Pulya
- Department of Pharmacy, BITS-Pilani
- Hyderabad Campus, Shamirpet
- Hyderabad
- India
| | - Nermine A. Osman
- Department of Pharmaceutical Organic Chemistry
- Faculty of Pharmacy
- Zagazig University
- Zagazig 44519
- Egypt
| | - Yamini Bobde
- Department of Pharmacy, BITS-Pilani
- Hyderabad Campus, Shamirpet
- Hyderabad
- India
| | - Abdalla E. A. Hassan
- Applied Nucleic Acids Research Center
- Zagazig University
- Egypt
- Department of Chemistry
- Faculty of Science
| | - Hanan A. Abdel-Fattah
- Department of Pharmaceutical Organic Chemistry
- Faculty of Pharmacy
- Zagazig University
- Zagazig 44519
- Egypt
| | - Balaram Ghosh
- Department of Pharmacy, BITS-Pilani
- Hyderabad Campus, Shamirpet
- Hyderabad
- India
| | - Amany M. Ghanim
- Department of Pharmaceutical Organic Chemistry
- Faculty of Pharmacy
- Zagazig University
- Zagazig 44519
- Egypt
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Ujang FA, Osman NA, Idris J, Halmi MIE, Hassan MA, Roslan AM. Start-up treatment of palm oil mill effluent (POME) final discharge using Napier Grass in wetland system. ACTA ACUST UNITED AC 2018. [DOI: 10.1088/1757-899x/368/1/012008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Ghanim AM, Knight DW, Osman NA, Abdel-Fattah HA, Kadry AM. New methods for the selective alkylation of 3-thioxo-1,2,4-triazin-5-ones. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.03.065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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NasrAllah MM, Issa HH, Maher AA, Gheita TA, Osman NA. Cryoglobulinaemic vasculitis and glomerulonephritis associated with schistosomiasis: a case study. East Mediterr Health J 2015; 21:354-8. [PMID: 26343125 DOI: 10.26719/2015.21.5.354] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Accepted: 01/08/2015] [Indexed: 11/09/2022]
Affiliation(s)
- M M NasrAllah
- Department of Nephrology, Kasr Al Ainy School of Medicine, University of Cairo, Cairo, Egypt
| | - H H Issa
- Department of Clinical Pathology, University of Beni Suef, Beni Suef, Egypt
| | - A A Maher
- Department of Internal Medicine, Zohoor Hospital, Port Said, Egypt
| | - T A Gheita
- Department of Rheumatology, Kasr Al Ainy School of Medicine, University of Cairo, Cairo, Egypt
| | - N A Osman
- Department of Nephrology, Kasr Al Ainy School of Medicine, University of Cairo, Cairo, Egypt
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Ali S, Osman NA, Razak A, Hussain S, Wan Abas WA. The effect of Dermo and Seal-In X5 prosthetic liners on pressure distributions and reported satisfaction during ramp ambulation in persons with transtibial limb loss. Eur J Phys Rehabil Med 2015; 51:31-37. [PMID: 24963603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
BACKGROUND Lower limb amputee's are greatly affected in dealing with the environmental barriers such as ramps and stairs and reported high interface pressure between the residual limb and socket/liner. Interface pressure between the residual limb and socket/liner can affect the satisfaction and use of the prosthesis. Until now, little attention has been paid to interface pressure between socket and stump during ramp negotiation and its effect on amputee's satisfaction. AIM The aim of this study was to evaluate the interface pressure produced by two different liners (Seal-In X5 and Dermo) between the residual limb and socket, and their effects on amputee's satisfaction during ramp negotiation. DESIGN Observational study. SETTING The study was performed in rehabilitation and biomedical departments of University Malaya Medical Centre. POPULATION Total ten (7 male, 3 female) transtibial amputees with unilateral amputation were included. METHODS Two prostheses were fabricated for each amputee. After four weeks of acclimation period, interface pressure between socket and residual limb was measured during walking on ramp and Prosthetic Evaluation Questionnaire (PEQ) was filled for each liner. RESULTS Mean peak pressure was significantly (P<0.05) lower with the Dermo liner compared with the Seal-In X5 liner in ramp walking. In addition, the participants were more satisfied with the Dermo liner (83.50 vs. 71.50) and mentioned fewer problems (87.00 vs. 69.00) compared with the Seal-In X5 liner during ramp negotiation. CONCLUSION It might be concluded that Dermo liner could be a good choice for the transtibial level of amputation due to relative decrease in interface pressure, satisfaction and fewer problems. CLINICAL REHABILITATION IMPACT The advantages of the Dermo liner may improve clinical rehabilitation of transtibial amputee's, as it provides more satisfaction and experienced fewer problems during ramp negotiation. This provides an improved walking and better quality of life in long term.
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Affiliation(s)
- S Ali
- Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia -
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10
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Osman NA, el-Sabban FF. Infant-feeding practices in Al-Ain, United Arab Emirates. East Mediterr Health J 1999; 5:103-10. [PMID: 10793786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
A survey was conducted to study the practices of infant-feeding and the influencing factors in Al-Ain, United Arab Emirates. It involved 375 mothers of different nationalities and backgrounds and 300 healthy infants. The mothers were interviewed at four primary health care clinics in Al-Ain. Results showed that 46% of infants were breastfed for 4-6 months. The mother's nationality and her educational status were significant influences on the mother's decision to exclusively breast-feed the infant, for how long and when to introduce supplementary food. Fresh cow and goat milk were the most common supplements. Inclusion of baby formula as a supplement generally occurred early, perhaps because of advertising and the affluence in Al-Ain.
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Affiliation(s)
- N A Osman
- Faculty of Medicine and Health Sciences, United Arab Emirates University, Al-Ain, United Arab Emirates
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11
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al-Ashmawy MI, el-Feky SA, el-Samii ZK, Osman NA. Synthesis and antiinflammatory activity of novel pyrimidine derivatives. Boll Chim Farm 1997; 136:492-9. [PMID: 9316317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Hydrazinolysis of ethyl [(4-methyl-6-phenylpyrimidin-2-yl)oxy]acetate (1) gives the unexpected bis(4-methyl-6-phenylpyrimidin-2-yl)hydrazine (2). The desired [(4 methyl-6-phenylpyrimidin-2-yl)oxy]acetohydrazide (3) was prepared from the ester (1) with hydrazine in absolute ethanol. Starting from 3, several new hydrazones, 1,3,4 oxadiazoles, 1,3,4-thiadiazoles, 1,2,4-triazoles and 1,3-thiazoles have been synthesized. Structure of the new compounds was confirmed by elemental analysis, spectral data and alternative synthesis in certain cases. Some representative examples were evaluated for their antiinflammatory activities.
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Affiliation(s)
- M I al-Ashmawy
- Department of Organic Pharmaceutical Chemistry, Faculty of Pharmacy, Zagazig University, Egypt
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12
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Ezimokhai M, Aloamaka CP, Osman NA, Mensah-Brown EP, Morrison J. The role of the vascular endothelium in the contractile responses of human chorionic plate artery in pre-eclampsia to prostaglandin F2 alpha, 5-hydroxytryptamine, and potassium chloride. Res Exp Med (Berl) 1995; 195:171-82. [PMID: 8570912 DOI: 10.1007/bf02576786] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
This study characterises the reactivity of chorionic plate artery in pre-eclampsia to prostaglandin F2 alpha (PGF2 alpha), 5-hydroxytryptamine (5-HT), and potassium chloride (KCl) and examines the role of the vascular endothelium in these responses. Ring segments of the chorionic plate arteries of women after normal and pre-eclamptic pregnancies were contracted by PGF2 alpha, 5-HT, and KCl. The experiments were carried out in the presence and absence of endothelium, and on intact rings treated with 10(-6)M indomethacin. The maximal contractile responses of rings from pre-eclamptic women to 5-HT, PGF2 alpha, or KCl were significantly greater than those of rings from normotensive pregnant women. The EC50 values of responses were significantly lower in rings from pre-eclamptic subjects. Endothelium removal and treatment of the rings with indomethacin had no effect on the contractile responses of rings from normotensive pregnant women to all the agents, but significantly increased the EC50 value and decreased the maximal contractile responses of rings from pre-eclamptic women to 5-HT and PGF2 alpha. While de-endothelialisation increased the EC50 value for responses of the rings from pre-eclamptic women to KCl, pretreatment with indomethacin did not significantly affect the KCl-induced responses. The results of the study suggest that pre-eclampsia enhanced the reactivity of human chorionic plate artery to 5-HT, PGF2 alpha, and KCl through the involvement of endothelial derived contracting factors. The increased responses to 5-HT and PGF2 alpha were inhibited by indomethacin, but those to KCl were not.
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Affiliation(s)
- M Ezimokhai
- Department of Obstetrics and Gynaecology, Faculty of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
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Aloamaka CP, Ezimokhai M, Osman NA, Morrison J. The mechanism of relaxation in response to magnesium by the aorta of pregnant rats with salt-induced hypertension. Exp Physiol 1995; 80:79-87. [PMID: 7734140 DOI: 10.1113/expphysiol.1995.sp003836] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The study examined the effect of salt-induced hypertension on vascular relaxation in response to magnesium sulphate during pregnancy. Pregnant Wistar rats were fed for 6 weeks on a diet containing 0.3% (control) and 8.0% (test) sodium chloride. Aortic rings were then removed and contracted with 10(-7) M phenylephrine or 30 mM potassium chloride. High salt intake increased the systolic blood pressure of the rats and increased the relaxation of phenylephrine-contracted intact rings in response to magnesium sulphate. Neither endothelium removal nor treatment with 10(-6) M indomethacin altered the relaxation of rings from the two groups of rats, when contracted with potassium chloride. Both processes significantly (P < 0.05) and similarly decreased the sensitivity and the maximal relaxation of rings from test rats contracted with phenylephrine; the relaxation of rings from the control rats was not altered. The results suggest that the relaxation of isolated rat aortic rings contracted with phenylephrine is enhanced in pregnant rats with salt-induced hypertension. The mechanism involved in this enhancement is dependent on the vascular endothelium and receptor activation, and is indomethacin sensitive.
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Affiliation(s)
- C P Aloamaka
- Department of Obstetrics and Gynaecology, Faculty of Medicine and Health Sciences, United Arab Emirates University, Al Ain
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14
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Osman NA, Abdel-Gadir F. Survey of total aflatoxins in camels sera by enzyme linked immunosorbent assay (ELISA). Mycotoxin Res 1991; 7:35-8. [DOI: 10.1007/bf03192162] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/1991] [Accepted: 03/07/1991] [Indexed: 11/29/2022]
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15
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Shoeb MA, Osman NA, Gaafar SM. Microbiologic studies on the periapical and periodontal abscesses of Egyptian patients. Egypt Dent J 1989; 35:301-12. [PMID: 2641363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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16
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Osman NA, Gaafar SM, Salah el-Din M, Wassel GM, Ammar NM. Hazardous effect of topical cosmetic application of Deirum (Juglans regia L. plant) on oral tissue. Egypt Dent J 1987; 33:31-5. [PMID: 3472872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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17
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Salah El-Din M, el-Gridly MM, Osman NA, Gaafar SM. Comparative pathobiochemical studies on the effect of cobalt 60 radiation and atropine injection on the salivary gland of rats. Egypt Dent J 1986; 32:279-92. [PMID: 3467960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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18
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Moustafa MH, Shoeib MA, el-Din MS, Gaafar SM, Osman NA. Clinical evaluation of the efficacy of two different designs of toothbrushes in plaque removal. Egypt Dent J 1986; 32:131-50. [PMID: 3460763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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