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Modi C, Sinha M, Thakkar V, Rana H, Chavda D. Choc-Tadalafil Fusion: Unlocking Solubility and Taste Harmony with ß-CD-Infused Medicated Chocolate. Recent Adv Drug Deliv Formul 2024; 18:RADDF-EPUB-139230. [PMID: 38500286 DOI: 10.2174/0126673878280254240312053406] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 01/27/2024] [Accepted: 02/22/2024] [Indexed: 03/20/2024]
Abstract
OBJECTIVE The primary limitations of tadalafil in treating erectile dysfunction are its low solubility and unpleasant bitter taste, which ultimately result in inadequate patient adherence. The present study aimed to develop and characterize a medicated chocolate formulation containing Tadalafil and ß-CD (solubility enhancer) employing the concept of Design of Experiment (DoE) using chocolate as a user-friendly excipient. METHODS An inclusion complex was formulated by incorporating the drug into ß-CD using the kneading method for solubility improvement and also as a taste masker for Tadalafil. The ratio of drug: ß-CD inclusion complex was selected based on a phase solubility study. The inclusion complex was molded into a chocolate base and optimized using the DoE approach. Further, drug excipient interaction was evaluated by DSC and FTIR study. RESULT Phase solubility study suggested a 1:1 ratio of Tadalafil: β-CD for better solubility. DSC spectra suggested the conversion of crystalline structure into an amorphous state which indicates improvement of the drug solubility. DSC and FTIR studies revealed that there was no significant interaction between drug and excipients. Next, %CDR (cumulative drug release) at 30 min revealed the immediate effect of Tadalafil from chocolate formulation and free drug analysis (an unbound drug with ß-CD) proved reduced bitterness of the drug in the complex. Additionally, the medicated chocolate was found to be stable at room temperature as per stability study. CONCLUSION β-CD was found to be a promising multifunctional excipient as a solubility enhancement carrier and taste masker for bitter-tasting drugs.
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Affiliation(s)
- Chetna Modi
- Department of Pharmaceutics, Anand Pharmacy College, Anand, Gujarat, India
| | - Manobika Sinha
- Department of Pharmaceutics, Anand Pharmacy College, Anand, Gujarat, India
| | - Vaishali Thakkar
- Department of Pharmaceutics, Anand Pharmacy College, Anand, Gujarat, India
| | - Hardik Rana
- Department of Pharmaceutics, Anand Pharmacy College, Anand, Gujarat, India
| | - Dipika Chavda
- Department of Pharmaceutics, Anand Pharmacy College, Anand, Gujarat, India
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Modi C, Gadhvi V, Prajapati BG. Envisioning the Future: Nanomicelles Revolutionizing Ocular Drug Delivery. Pharm Nanotechnol 2024; 12:PNT-EPUB-139051. [PMID: 38465435 DOI: 10.2174/0122117385286925240221111601] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 01/25/2024] [Accepted: 01/30/2024] [Indexed: 03/12/2024]
Abstract
Due to the complexities of the eye's anatomy and physiology, achieving targeted drug delivery with minimal harm to healthy eye tissues has proven to be difficult. The focus of the review is on the potential of lipid and polymer micelle-based drug delivery systems, specifically nanomicelles, to overcome these challenges and improve the absorption of insoluble drugs. Nanomicelles offer several advantages, such as enhanced drug release kinetics, increased drug incorporation, and improved formulation of hydrophobic medicines. The review provides insights into various excipients, preparation methods, and evaluation techniques used in nanomicellar-based drug delivery systems. Furthermore, the review highlights current research and patents related to nanomicelles in ocular drug delivery, suggesting growing interest and potential for future developments in this field. Nanomicelles present a promising approach that may revolutionize ocular drug delivery and open new possibilities for treating various ocular diseases while minimizing adverse effects on healthy eye tissues.
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Affiliation(s)
- Chetna Modi
- Department of Pharmaceutics, Anand Pharmacy College, Anand, Gujarat, India
| | - Varsha Gadhvi
- Department of Pharmaceutics, Anand Pharmacy College, Anand, Gujarat, India
| | - Bhupendra G Prajapati
- Shree S.K.Patel College of Pharmaceuticals Education and Research, Ganpat University, India
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Modi C, Kathota R, Patel A, Thakkar V, Rana H. Development and Characterization of Febuxostat loaded floating beads as Gastro-Retentive Drug Delivery System in the treatment of Gout: A Statistical Approach. CDTH 2023. [DOI: 10.2174/1574885518666230331084428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
Background:
Febuxostat is a BCS class-II drug, used in the treatment of gout. However, because of its lower solubility, a higher and more frequent dose of the drug is required in the treatment.
background:
Febuxostat is a BCS class-II drug, used in the treatment of gout. Therapeutic window of Febuxostat is at site of stomach. But because of its lower solubility, higher and frequent dose of drug is required in the treatment.
Objective:
The objective of this research was to develop and evaluate febuxostat-loaded floating beads as a gastro-retentive drug delivery system (GRDDS) to target drug release up to 24hr in order to enhance bioavailability.
objective:
The objective of this research was to develop and evaluate febuxostat loaded floating beads as Gastro-retentive drug delivery system (GRDDS) to target drug release up to 24hr in order of enhancement of bioavailability.
Methodology:
Gastro-retentive floating beads were formulated using the ionotropic gelation method. Screening of lipids was carried out based on the shape and texture of floating beads. Drug-excipient compatibility study was done using DSC analysis. Further optimization of gastro-retentive floating beads of febuxostat was performed by Box-Behnken design using gelucire 43/01, lactose, and soluplus as independent variables and %drug entrapment and %drug release after 24 hr as dependent variables. Evaluation of the optimized batch was performed for in vitro buoyancy, %drug entrapment, %drug release, FTIR, and SEM study.
method:
Gastro-retentive floating beads were formulated using ionotropic gelation method. Screening of lipids was carried out on the basis of shape and texture of floating beads. Drug-excipient compatibility study was done using DSC analysis. Further optimization of gastro-retentive floating beads of febuxostat was done by Box-Behnken Design using Gelucire 43/01, lactose, soluplus as independent variables and %Drug entrapment and %drug release after 24 hr as dependent variables. Evaluation of optimized batch was performed for in vitro buoyancy, %drug entrapment, %drug release, FTIR and SEM study.
Result and Discussion:
In the ANOVA, contour plots, and 3D surface plots, the optimized batch showed 93.95±0.29 % drug entrapment and 88.14±0.58 % drug release after 24 hr with 98%±1% in-vitro buoyancy. Overlay plots and checkpoint batches were accompanied to confirm the optimization. Polynomial equations proved the positive effect of lipids on drug entrapment and drug release. SEM images explained porous and microstructures on beads.
result:
From the ANOVA table, Contour plots and 3D surface plots, Optimized batch showed 93.95±0.29 %drug entrapment, 88.14±0.58 % drug release after 24 hr, with 98%±1% in-vitro buoyancy. Overlay plot and check point batches were accompanied to confirm the optimization. Polynomial equations prove positive effect of lipid on drug entrapment and drug release. SEM images explained porous and micro structure on beads.
Conclusion:
In conclusion, gastro-retentive febuxostat floating beads were successfully developed and characterized for once a daily dose with enhanced bioavailability and reduced cost of therapy.
other:
NA
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Behget E, Modi C. What does the COVID-19 leadership experience teach us about healthcare leadership development? BMJ Lead 2022; 6:295-298. [PMID: 36794612 DOI: 10.1136/leader-2021-000497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Accepted: 11/03/2021] [Indexed: 11/04/2022]
Affiliation(s)
- Eren Behget
- Leadership and Lifelong Learning, NHS England and NHS Improvement London, London, UK
| | - Chetna Modi
- Leadership and Lifelong Learning, NHS England and NHS Improvement London, London, UK
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5
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Modi C, Bharadia P. Pareto chart‐enabled screening of influential factors in designing transfersomes. Separation Science Plus 2022. [DOI: 10.1002/sscp.202200082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Chetna Modi
- Department of Pharmaceutics Anand Pharmacy College Anand India
| | - Praful Bharadia
- Department of Pharmaceutics L. M. College of Pharmacy Ahmedabad India
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Dragun AE, Modi C, Henson CF, Jain S, Ahlawat S, Eastwick G, Kubicek GJ, Mezera MA, Mulvihill DJ, Perri J, Juneja B, Ennis RD, Haffty BG. A Statewide Multi-institutional Study of Asymptomatic Pre-Treatment Testing of Radiation Therapy Patients for SARS-CoV-2 in a High-Incidence Region of the United States. Int J Radiat Oncol Biol Phys 2020; 108:1401-1402. [PMID: 33427661 PMCID: PMC7671924 DOI: 10.1016/j.ijrobp.2020.09.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- A E Dragun
- MD Anderson Cancer Center at Cooper University Hospital, Department of Radiation Oncology, Camden, NJ
| | - C Modi
- Rutgers Cancer Institute of New Jersey, Department of Radiation Oncology, New Brunswick, NJ
| | - C F Henson
- Trinitas Comprehensive Cancer Center, Elizabeth, NJ
| | - S Jain
- Holy Redeemer Hospital, Meadowbrook, PA
| | - S Ahlawat
- MD Anderson Cancer Center at Cooper University Hospital, Department of Radiation Oncology, Camden, NJ
| | - G Eastwick
- MD Anderson Cancer Center at Cooper University Hospital, Department of Radiation Oncology, Camden, NJ
| | - G J Kubicek
- MD Anderson Cancer Center at Cooper University Hospital, Department of Radiation Oncology, Camden, NJ
| | - M A Mezera
- MD Anderson Cancer Center at Cooper University Hospital, Department of Radiation Oncology, Camden, NJ
| | - D J Mulvihill
- MD Anderson Cancer Center at Cooper University Hospital, Department of Radiation Oncology, Camden, NJ
| | - J Perri
- MD Anderson Cancer Center at Cooper University Hospital, Department of Radiation Oncology, Camden, NJ
| | - B Juneja
- MD Anderson Cancer Center at Cooper University Hospital, Department of Radiation Oncology, Camden, NJ
| | - R D Ennis
- Rutgers Cancer Institute of New Jersey, Department of Radiation Oncology, New Brunswick, NJ
| | - B G Haffty
- Rutgers Cancer Institute of New Jersey, Department of Radiation Oncology, New Brunswick, NJ
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Kabarriti R, Brodin P, Ginsburg Berkowitz A, Ingber A, Ohri N, McGovern K, Modi C, Ow T, Tassler A, Packer S, Schiff B, Smith R, Haigentz M, Guha C, Kalnicki S, Tomé W, Garg M. EP-1096: Prognostic value of pretreatment FDG-PET features in laryngeal cancer patients treated with RT. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)32346-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Hignett S, Jones EL, Miller D, Wolf L, Modi C, Shahzad MW, Buckle P, Banerjee J, Catchpole K. Human factors and ergonomics and quality improvement science: integrating approaches for safety in healthcare. BMJ Qual Saf 2015; 24:250-4. [PMID: 25715799 PMCID: PMC4392211 DOI: 10.1136/bmjqs-2014-003623] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- Sue Hignett
- Loughborough Design School, Loughborough University, Loughborough, UK
| | - Emma Leanne Jones
- College of Medicine, Biological Sciences and Psychology, University of Leicester, Leicester, UK
| | - Duncan Miller
- Department of Quality Improvement, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
| | - Laurie Wolf
- Department of Operational Excellence, Barnes-Jewish Hospital, St Louis, Missouri, USA
| | - Chetna Modi
- Health Education East Midlands, Leicester, UK
| | | | - Peter Buckle
- Helen Hamlyn Centre for Design, Royal College of Art, London, UK
| | - Jaydip Banerjee
- Department of Emergency Medicine, Leicester Royal Infirmary, Leicester, UK
| | - Ken Catchpole
- Department of Surgery, Cedars-Sinai Medical Centre, Los Angeles, California, USA
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Abstract
Transdermal drug delivery influence consumer acceptance and marked increase in bioavailability of some drugs which undergoes hepatic first-pass metabolism. Fabrication of transdermal patch requires lots of attention regarding the amount of components used for it. Because of varied nature of polymer and plasticizer, transdermal patches have different properties and different drug release. This study is on the basis to evaluate the amount to be needed for fabrication of diclofenac transdermal patch. Study shows that Hydroxy Propyl Methyl Cellulose has great influence on transdermal patch, if it is used alone in combination with glycerin or PEG-4000 plasticizer.
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Affiliation(s)
- Chetna Modi
- M.Pharm in Pharmaceutical Technology, Assistant Professor, Department of Pharmaceutics, Shree Krishna Institute of Pharmacy, Shankhalpur, Gujarat, India
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10
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Dudhatra G, Mody S, Patel H, Modi C, Chukewar A, Kumar A, Awale M. Prostaglandins and its analogues : An approach for treatment of anoestrus and to enhance breeding efficiency. Vet World 2012. [DOI: 10.5455/vetworld.2012.378-384] [Citation(s) in RCA: 1] [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] [Indexed: 11/03/2022] Open
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11
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Ko P, Jayasingam R, Modi C, Hallit R, Nguyen N, Daniel S, Soleymani T, Fallon J, Booth L, Perez G, Slim J, Sensakovic J, Boghossian J. A scoring system for severity of disease associated with mortality for Clostridium difficile associated disease. Int J Infect Dis 2010. [DOI: 10.1016/j.ijid.2010.02.495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Lee SH, Modi HN, Song HR, Hazra S, Suh SW, Modi C. Deceleration in maturation of bone during adolescent age in achondroplasia--a retrospective study using RUS scoring system. Skeletal Radiol 2009; 38:165-70. [PMID: 18629458 DOI: 10.1007/s00256-008-0544-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2008] [Revised: 06/07/2008] [Accepted: 06/11/2008] [Indexed: 02/02/2023]
Abstract
OBJECTIVES Knowledge of bone age in achondroplasia is required for the prediction of adult height, timings of limb lengthening, and epiphysiodesis procedures. The purpose of this investigation was to determine the differences in skeletal age in achondroplasia and a control population with the Tanner-Whitehouse 3 method using the RUS score and to determine the right age for the interventional procedure for limb lengthening procedure or deformity correction in these patients. MATERIALS AND METHODS Left hand radiographs of 34 patients (age range, 5-18 years) with achondroplasia were evaluated for skeletal age using the RUS scoring system, which were compared with the left hand radiographs of 41 patients (age range, 5-18 years) without achondroplasia measuring skeletal age. The difference in chronological age and RUS bone age were evaluated statistically according to gender and age group. RESULTS In the achondroplasia group, chronological age were 10.5 +/- 4.3 years for males and 10.1 +/- 3.6 years for females and RUS bone age were 9.2 +/- 4.0 years for males and 8.9 +/- 3.4 years for females, which showed statistically significantly difference (males p = 0.0003 and females p < 0.0001), while in the control group, chronological age were 11.1 +/- 2.9 years for males and 10.7 +/- 3.4 years for females and RUS bone age were 11.2 +/- 3.4 years for males and 10.7 +/- 3.3 years for females, which did not show statistically significantly difference (males p = 0.54 and females p = 0.76). Our finding suggested a delay of 1.4 years for males and 1.2 years for females in the maturation of bone in achondroplasia patients. Difference between chronological age and RUS bone age was 0.9 +/- 1.1 for <10 years and 1.6 +/- 0.9 for >10 years in the study group, while 0.1 +/- 1.1 for <10 years and -0.2 +/- 0.6 for >10 years in the control group, which also showed >statistically significant difference (<10 years p = 0.04 and >10 years p < 0.0001). These differences indicate that there was a delay in the maturation of bones by 1 year in the group <10 years and 1.8 years in the group >10 years in achondroplasia patients compared to nonachondroplasia patients. CONCLUSION We recommend the use of the Tanner-Whitehouse 3 method especially the radius, ulna, short bone score to measure the skeletal age and to wait for a longer time before interventional procedures in achondroplasia patients.
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Affiliation(s)
- Suk-Ha Lee
- Department of Orthopedics, Konkuk University Hospital, Seoul, South Korea
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13
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Cheng MK, Modi C, Cookson JC, Hutchinson I, Heald RA, McCarroll AJ, Missailidis S, Tanious F, Wilson WD, Mergny JL, Laughton CA, Stevens MFG. Antitumor polycyclic acridines. 20. Search for DNA quadruplex binding selectivity in a series of 8,13-dimethylquino[4,3,2-kl]acridinium salts: telomere-targeted agents. J Med Chem 2008; 51:963-75. [PMID: 18247546 DOI: 10.1021/jm070587t] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The growth-inhibitory activities of an extensive series of quaternized quino[4,3,2- kl]acridinium salts against tumor cell lines in vitro have been measured and their biological properties interpreted in the light of differential binding to different DNA isoforms. Selectivity for quadruplex DNA binding and stabilization by compounds were explored through an array of methods: UV absorption and fluorescence emission spectroscopy, surface plasmon resonance, and competition dialysis. Quadruplex DNA interaction was further characterized through FRET and DNA polymerase arrest assays. Telomerase inhibition, inferred from the TRAP assay, is attributed to quadruplex stabilization, supported by the strong correlation (R(2) = 0.81) across the series between quadruplex DNA binding affinity and TRAP inhibition potency. Growth inhibition potency in the NCI60 human tumor cell line panel is more marked in compounds with greater DNA duplex binding affinity (R(2) = 0.82). Quantification of relative quadruplex and duplex binding affinity constants puts some of these ligands among the most selective quadruplex DNA interactive agents reported to date.
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Affiliation(s)
- Mai-Kim Cheng
- Cancer Research UK Experimental Cancer Chemotherapy Research Group, Centre for Biomolecular Sciences, School of Pharmacy, University of Nottingham, Nottingham, UK
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14
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Rupani A, Modi C, Desai S, Rege J. Primary anaplastic large cell lymphoma of central nervous system--a case report. J Postgrad Med 2005; 51:326-7. [PMID: 16388180] [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: 05/06/2023] Open
Abstract
Central nervous system (CNS) involvement is extremely rare in anaplastic large cell lymphoma (ALCL). Primary ALCL of CNS on radiology is often misdiagnosed as tuberculosis. We report a fatal case of primary ALCL of CNS in a 17 year old male. He came with history of headache and left partial seizures. MRI showed a well- circumscribed lesion in the right fronto-parietal lobe eroding the skull bone. Biopsy showed large pleomorphic cells. Immunohistochemical stains showed positivity for CD30, CD43, EMA and ALK-1. In spite of radiotherapy and steroids, patient expired. Hence a high level of suspicion is essential for early diagnosis and for instituting appropriate treatment.
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Affiliation(s)
- A Rupani
- Department of Pathology, T. N. Medical College, B. Y. L. Nair Charitable Hospital, Mumbai, India.
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15
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Missailidis S, Modi C, Trapani1 V, Laughton CA, Stevens MFG. Antitumor Polycyclic Acridines. Part 16. Triplex DNA as a Target for DNA-Binding Polycyclic Acridine Derivatives. Oncol Res 2005. [DOI: 10.3727/096504005775082002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- Sotiris Missailidis
- Chemistry Department, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK
| | - Chetna Modi
- Cancer Research UK Experimental Cancer Chemotherapy Research Group, Centre for Bio-molecular Sciences, School of Pharmacy, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Valentina Trapani1
- Cancer Research UK Experimental Cancer Chemotherapy Research Group, Centre for Bio-molecular Sciences, School of Pharmacy, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Charles A. Laughton
- Cancer Research UK Experimental Cancer Chemotherapy Research Group, Centre for Bio-molecular Sciences, School of Pharmacy, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Malcolm F. G. Stevens
- Cancer Research UK Experimental Cancer Chemotherapy Research Group, Centre for Bio-molecular Sciences, School of Pharmacy, University of Nottingham, Nottingham, NG7 2RD, UK
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Missailidis S, Modi C, Trapani V, Laughton CA, Stevens MFG. Antitumor polycyclic acridines. Part 16. Triplex DNA as a target for DNA-binding polycyclic acridine derivatives. Oncol Res 2005; 15:95-105. [PMID: 16119007] [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: 05/04/2023] Open
Abstract
Triple-stranded DNA structures have been implicated in a number of major biological processes, including the transcription and translation of a number of genes, as well as in the interaction of DNA with a number of proteins. Furthermore, antigene therapies under development are based on the recognition and binding of a single oligonucleotide strand to a double-stranded sequence, thus forming a triple helix. Triplex DNA formation is a relatively weak and temporary phenomenon; therefore, molecules that selectively bind to and stabilize triple helices may show a variety of novel biological effects. The biophysical and biological characterization of a series of antitumor polycyclic acridines that bind to triplex DNA is reported. These compounds, whose synthesis has been previously reported, have been tested for their interaction with both purine and pyrimidine type triple helices and compared with the relevant double-stranded DNA. As a pyrimidine triplex model we have used the T*AT sequence, which we have compared with the AT duplex, whereas the purine triplex oligonucleotide d[G3A4G3]*d[G3A4G3].d[C3T4C3] has been compared with the duplex d[G3A4G3].d[C3T4C3]. The compounds demonstrate various degrees of preferential binding to triplex DNA over normal duplex DNA, as measured by UV, fluorescence, circular dichroism, and thermal denaturation. Tri-substituted acridine derivatives demonstrated the highest affinity and ability to stabilize triplex DNA structures. Furthermore, structure/affinity analysis gives insights into the structural features that optimize affinity and selectivity for triplex DNA, and may play a role in their profile of antitumor activity.
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Affiliation(s)
- Sotiris Missailidis
- Cancer Research UK Experimental Cancer Chemotherapy Research Group, Centre for Bio-molecular Sciences, School of Pharmacy, University of Nottingham, Nottingham, NG7 2RD, UK.
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17
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Missailidis S, Stanslas J, Modi C, Ellis MJ, Robins RA, Laughton CA, Stevens MFG. Antitumor polycyclic acridines. Part 12. Physical and biological properties of 8,13-diethyl-6-methylquino[4,3,2-kl]acridinium iodide: a lead compound in anticancer drug design. Oncol Res 2003; 13:175-89. [PMID: 12549627] [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: 02/28/2023] Open
Abstract
The biophysical and biological characterization of 8,13-diethyl-6-methylquino[4,3,2-k]lacridinium iodide (6) is reported. The compound binds to DNA, as measured by UV, fluorescence, and circular dichroism studies, and stabilizes the double helix and higher order DNA structures (DNA triplexes and quadruplexes) against thermal denaturation. Unlike many DNA ligands, (6) shows no specificity for binding to specific base pair combinations and does not inhibit topoisomerase I (topo I) or topo II activity. Furthermore, the biological fingerprint elicited by (6) in in vitro evaluations does not compare with clinical agents of the topo II inhibition class. The compound provokes cell cycle arrest in response to DNA damage and the biological sequelae are dependent on the p53 status of the cell line. DNA damage by (6) upregulates p53 and p21(CIP/WAF1) proteins. The unusual structure of (6) and its ease of synthesis in a "one-pot" reaction are features that are being exploited in the design and development of a new series of G-quadruplex stabilizing telomerase inhibitors. However, although the second-generation compounds that resulted from (6) present strong telomerase inhibition, (6) in itself presents yet a different mode of action, with a strong preference for triplex DNA, sequences often found in a number of genes.
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Affiliation(s)
- Sotiris Missailidis
- Cancer Research Laboratories, School of Pharmaceutical Sciences, School of Clinical Laboratory Sciences, University of Nottingham, Nottingham, NG7 2RD, UK.
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18
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Heald RA, Modi C, Cookson JC, Hutchinson I, Laughton CA, Gowan SM, Kelland LR, Stevens MFG. Antitumor polycyclic acridines. 8.(1) Synthesis and telomerase-inhibitory activity of methylated pentacyclic acridinium salts. J Med Chem 2002; 45:590-7. [PMID: 11806711 DOI: 10.1021/jm011015q] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.0] [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: 11/29/2022]
Abstract
Two short routes to novel methylated pentacyclic quinoacridinium salts have been devised. New compounds display telomerase-inhibitory potency (<1 microM) in the TRAP assay. 3,11-Difluoro-6,8,13-trimethyl-8H-quino[4,3,2-kl]acridinium methosulfate (12d, RHPS4, NSC 714187) has a higher selectivity for triplex and quadruplex DNA structures than the 3,6,8,11,13-pentamethyl analogue (12c, RHPS3, NSC 714186) and a low overall growth-inhibitory activity in the NCI 60 cell panel (mean GI(50) 13.18 microM); in addition, the activity profile of 12d does not COMPARE with agents of the topoisomerase II class. Compound 12d is soluble in water, stable in the pH range of 5-9, efficiently transported into tumor cells, and is currently the lead structure for further elaboration in this new class of telomerase inhibitor.
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Affiliation(s)
- Robert A Heald
- Cancer Research Laboratories, School of Pharmaceutical Sciences, University of Nottingham, Nottingham NG7 2RD, UK
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Modi P, Modi C. Sepsis, an important cause of maternal mortality. Int J Gynaecol Obstet 2000. [DOI: 10.1016/s0020-7292(00)85182-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Afarinkia K, Binch HM, Modi C. Acceleration of nucleophilic addition to vinylphosphonates and vinyl phosphine oxides by chlorotrimethylsilane. Tetrahedron Lett 1998. [DOI: 10.1016/s0040-4039(98)01612-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Windsor IM, Bill PL, Bhigjee AI, Haribhai HC, Kelbe C, Hoffman M, Modi C. HTLV-I-associated myelopathy in Natal. S Afr Med J 1988; 74:370. [PMID: 2901787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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