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El-Kady AM, Mahmoud EM, Sayed M, Kamel SM, Naga SM. In-vitro and in-vivo evaluation for the bio-natural Alginate/nano-Hydroxyapatite (Alg/n-HA) injectable hydrogel for critical size bone substitution. Int J Biol Macromol 2023; 253:126618. [PMID: 37659491 DOI: 10.1016/j.ijbiomac.2023.126618] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 05/01/2023] [Revised: 08/27/2023] [Accepted: 08/28/2023] [Indexed: 09/04/2023]
Abstract
Currently, bio-natural injectable hydrogels are receiving a lot of attention due to their ability to control, adjust, and adapt to random bone defects, in addition, to their ability to mimic the composition of natural bones. From such a viewpoint, this study goal is to prepare and characterize the injectable hydrogels paste based on the natural alginate (Alg) derived from brown sea algae as a polysaccharide polymer, which coupled with nano biogenic-hydroxyapatite (n-HA) prepared from eggshells and enriched with valuable trace elements. The viscosity and mechanical properties of the paste were investigated. As well as the in-vitro study in terms of water absorption and biodegradability in the PBS, biocompatibility and the capability of the injectable Alginate/n-Hydroxyapatite (Alg/n-HA) to regenerate bone for the most suitable injectable form. The injectable hydrogel (BP -B sample) was chosen for the study as it had an appropriate setting time for injecting (13 mins), and suitable compressive strength reached 6.3 MPa. The in vivo study was also carried out including a post-surgery follow-up test of the newly formed bone (NB) in the defect area after 10 and 20 weeks using different techniques such as (SEM/EDX) and histological analysis, the density of the newly formed bone by Dual x-ray absorptiometry (DEXA), blood biochemistry and the radiology test. The results proved that the injectable hydrogels Alginate/n-Hydroxyapatite (Alg/n-HA) had an appreciated biodegradability and bioactivity, which allow the progress of angiogenesis, endochondral ossification, and osteogenesis throughout the defect area, which positively impacts the healing time and ensures the full restoration for the well-mature bone tissue that similar to the natural bone.
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Affiliation(s)
- Abeer M El-Kady
- Glass Research Department, National Research Centre, El-Bohous Str., 12622 Cairo, Egypt
| | - E M Mahmoud
- Ceramics Department, National Research Centre, El-Bohous Str., 12622 Cairo, Egypt.
| | - M Sayed
- Ceramics Department, National Research Centre, El-Bohous Str., 12622 Cairo, Egypt
| | - S M Kamel
- Oral Biology Department, MSA University, Egypt
| | - S M Naga
- Ceramics Department, National Research Centre, El-Bohous Str., 12622 Cairo, Egypt
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Gopalakrishnan U, Madasamy R, Mathew R, Alsulaimani FF, Sayed M, Mugri M, Baeshen HA, Bhandi S, Testarelli L, Mahendra L, Muruganandhan J, Raj AT, Patil S. A split-mouth randomized controlled trial to compare the rate of canine retraction after a soft tissue procedure compared against a corticotomy procedure for accelerated tooth movement. Niger J Clin Pract 2023; 26:666-673. [PMID: 37470637 DOI: 10.4103/njcp.njcp_209_22] [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] [Indexed: 07/21/2023]
Abstract
Background and Aim Various methods to accelerate the orthodontic tooth movement have been used, among which corticotomy is considered to be the most common one. The suggested reasoning for such acceleration was the regional acceleratory phenomenon (RAP). Since the RAP is a property of both the hard and soft tissues, we designed a soft tissue flap procedure to compare the effects with the conventional corticotomy procedure. A split-mouth study was conducted where the two procedures were assessed in a single participant. Patients and Methods The total sample size was calculated to be 40 with 20 participants in each group. The rate of tooth movement was the primary outcome measure, and the secondary outcomes were dentoalveolar changes, which were studied in both the conventional corticotomy and the flap-only procedure based on a cone-beam computed tomography (CBCT) wherein the alveolar bone density (BD) around canines, tipping, and rotational changes in canines, premolars, and molars were assessed. Results Corticotomy resulted in greater canine angulation, lesser canine rotation and premolar rotation, and greater molar rotation compared with flap elevation, but these differences were statistically insignificant. Conclusion Though the corticotomy resulted in higher BD, the differences were statistically insignificant. There was no significant difference in the rate of space closure assessed by the two techniques compared.
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Affiliation(s)
- U Gopalakrishnan
- Department of Orthodontics, Sri Venkateswara Dental College and Hospital, Chennai, India
| | - R Madasamy
- Department of Orthodontics, Sri Venkateswara Dental College and Hospital, Chennai, India
| | - R Mathew
- Department of Oral and Maxillofacial Radiology, College of Dental Medicine, Midwestern University, Illinois, USA
| | - F F Alsulaimani
- Department of Orthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - M Sayed
- Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia
| | - M Mugri
- Department of Maxillofacial Surgery and Diagnostic Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia
| | - H A Baeshen
- Department of Orthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - S Bhandi
- College of Dental Medicine, Roseman University of Health Sciences, South Jordan, UTAH, USA
| | - L Testarelli
- Department of Oral and Maxillofacial Sciences, Sapienza University, University of Rome, Rome, Italy
| | - L Mahendra
- Department of Orthodontics, Sri Venkateswara Dental College and Hospital, Chennai, India
| | - J Muruganandhan
- Department of Oral Pathology and Microbiology, Sri Venkateswara Dental College and Hospital, Chennai, Tamil Nadu, India
| | - A T Raj
- Department of Oral Pathology and Microbiology, Sri Venkateswara Dental College and Hospital, Chennai, Tamil Nadu, India
| | - S Patil
- College of Dental Medicine, Roseman University of Health Sciences, South Jordan, USA
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Sayed M, Maity DK, Pal H. A comparative photophysical study on the structurally related coumarin 102 and coumarin 153 dyes. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2022.114265] [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: 10/14/2022]
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Alexander A, Pillai AS, Nallamuthu A, Pal H, Enoch IVMV, Sayed M. G-Quadruplex selectivity and cytotoxicity of a guanidine-encapsulated porphyrin-cyclodextrin conjugate. Int J Biol Macromol 2022; 218:839-855. [PMID: 35905761 DOI: 10.1016/j.ijbiomac.2022.07.170] [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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 07/07/2022] [Accepted: 07/21/2022] [Indexed: 11/19/2022]
Abstract
G-Quadruplex DNAs represent out-of-the-way nucleic acid conformations, frequently formed by guanine-rich sequences. They have emanated as cancer-associated targets for designed small molecules. The variation in the binding affinity of the synthesized compounds to duplex and quadruplex structures is an intriguing quest, solved by spectroscopic analysis. In this paper, we report the synthesis of a porphyrin-cyclodextrin conjugate, characterized by utilizing FT-IR, NMR, and mass spectrometry. Further, two benzimidazolylguanidines are synthesized which form host: guest complexes with the porphyrin-cyclodextrin conjugate. The structure of the complexes is optimized by analyzing their 2D ROESY spectra. The interactions of the host, guest, and the host: guest complexes with the duplex (calf thymus DNA) and quadruplex (kit22) nucleic acids are investigated employing UV-vis, fluorescence, circular dichroism, and DNA melting experiments. The calculated strengths of the compounds' binding with kit22 are in the order of 106, which is larger than those observed for the duplex DNA binding. The significant G-quadruplex selectivity of the host: guest complex of anthracenyl-benzimidazolylguanidine is discussed in detail. Further, the in vitro cytotoxicity of the compounds on MCF-7 cell lines is examined. The host: guest complexes show enhanced half-maximal inhibitory concentration values compared to the un-complexed compounds.
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Affiliation(s)
- Aleyamma Alexander
- Centre for Nanoscience and Genomics, Karunya Institute of Technology and Sciences (Deemed University), Coimbatore 641114, Tamil Nadu, India
| | - Archana Sumohan Pillai
- Centre for Nanoscience and Genomics, Karunya Institute of Technology and Sciences (Deemed University), Coimbatore 641114, Tamil Nadu, India
| | - Ananthi Nallamuthu
- Department of Applied Chemistry, Karunya Institute of Technology and Sciences (Deemed University), Coimbatore 641114, Tamil Nadu, India
| | - Haridas Pal
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 00085, India
| | - Israel V M V Enoch
- Centre for Nanoscience and Genomics, Karunya Institute of Technology and Sciences (Deemed University), Coimbatore 641114, Tamil Nadu, India.
| | - Mhejabeen Sayed
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 00085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India.
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Wadhwa M, Kang HN, Thorpe R, Knezevic I, Aprea P, Bielsky MC, Ekman N, Heim HK, Joung J, Kurki P, Lacana E, Njue C, Nkansah E, Savkina M, Thorpe R, Yamaguchi T, Wadhwa M, Wang J, Weise M, Wolff-Holz E, Allam M, Bahaa H, Sayed M, Al-Oballi A, Alshahrani A, Baek D, Kim J, Chua H, Gangakhedkar J, Jagtap MP, Lyaskovsky T, Okudaira S, Ondee W, Sotomayor P, Ricra JS, Uviase J, Ahmed F, Rajendran Y, Defendi HT, Cho SO, Qu A, Acha V, Gencoglu M, Ho K, Baldrighi M, Schiestl M, Watson K, Spitzer E, Chong S, Fukushima A, Kang HN, Knezevic I, Pante G, Simao M. WHO informal consultation on revision of guidelines on evaluation of similar biotherapeutic products, virtual meeting, 30 June – 2 July 2021. Biologicals 2022; 76:1-9. [PMID: 35466023 PMCID: PMC9109723 DOI: 10.1016/j.biologicals.2022.03.001] [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] [Received: 01/07/2022] [Revised: 02/28/2022] [Accepted: 03/29/2022] [Indexed: 11/26/2022] Open
Abstract
The WHO informal consultation was held to promote the revision of WHO guidelines on evaluation of similar biotherapeutic products (SBPs) adopted by the Expert Committee on Biological Standardization (ECBS) in 2009. It was agreed in the past consultations that the evaluation principles in the guidelines are still valid, but a review was recommended to provide more clarity and case-by-case flexibility. The opportunity was therefore taken to review the experience and identify areas where the current guidance could be more permissive without compromising its basic principles, and where additional explanation could be provided regarding the possibility of reducing the amount of data needed for regulatory approval. The meeting participants applauded the leading role taken by the WHO in providing a much-needed streamlined approach for development and evaluation of SBPs which will provide efficient and cost-effective product development and increase patient access to treatments. It was recognized that the principles as currently described in the draft WHO guidelines are based on sound science and experience gained over the last fifteen years of biosimilar approvals. However, since these guidelines when finalised will constitute the global standard for biosimilar evaluation and assist national regulatory authorities in establishing revised guidance and regulatory practice in this complex area, it was felt that further revision and clarity on certain perspectives in specific areas was necessary to dispel uncertainties arising in the current revised version. This report describes the principles in the draft guidelines, including topics discussed and consensus reached. WHO guidelines serve as a basis for the development of national regulatory framework for biosimilars. Revision of guidelines is to provide more flexibility and clarification on data required for regulatory approval. Revised guidelines would contribute to improving consistency on regulatory decision and patient access to treatments.
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Abstract
Supramolecular chemistry involving macrocyclic hosts is a highly interdisciplinary and fast-growing research field in chemistry, biochemistry, and materials science. Host-guest based supramolecular assemblies, as constructed through non-covalent interactions, are highly dynamic in nature, and can be tuned easily using their responses to various external stimuli, providing a convenient approach to achieve excellent functional materials. Macrocyclic hosts, particularly cyclodextrins, cucurbit[n]urils, and calix[n]arenes, which have unique features like possessing hydrophobic cavities of different sizes, along with hydrophilic external surfaces, which are also amenable towards easy derivatizations, are versatile cavitands or host molecules to encapsulate diverse guest molecules to form stable host-guest complexes with many unique structures and properties. Interestingly, host-guest complexes possessing amphiphilic properties can easily lead to the formation of various advanced supramolecular assemblies, like pseudorotaxanes, rotaxanes, polyrotaxanes, supramolecular polymers, micelles, vesicles, supramolecular nanostructures, and so on. Moreover, these supramolecular assemblies, with varied morphologies and responsiveness towards external stimuli, have immense potential for applications in nanotechnology, materials science, biosensors, drug delivery, analytical chemistry and biomedical sciences. In this perspective, we present a stimulating overview, discussing simple host-guest systems to complex supramolecular assemblies in a systematic manner, aiming to encourage future researchers in this fascinating area of supramolecular chemistry to develop advanced supramolecular materials with superior functionalities, for their deployment in diverse applied areas.
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Affiliation(s)
- Mhejabeen Sayed
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India. .,Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India
| | - Haridas Pal
- Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India.,Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
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Sayed M, Salah Gaber H, Z Abd Elrhman M, A R Helmy H, Hasan-Ali H. Thromboembolic risk is potentially reduced in mitral stenosis shortly after percutaneous mitral valvotomy. Eur Heart J 2021; 42. [DOI: 10.1093/eurheartj/ehab724.1692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 09/02/2023] Open
Abstract
Abstract
Background
Rheumatic mitral stenosis (MS) is a problem in the developing countries. Left atrium (LA) and appendage (LAA) dysfunction are considered determinant factors for thrombus formation even in patients with sinus rhythm (SR). Percutaneous mitral valvotomy (PMV) is a well accepted therapeutic option. However, no available data considers patients with SR as a low risk group for the development of thrombus.
Purpose
Studying short term impact of PMV on P wave morphology, NT-pro BNP as well as LAA properties in patients with MS and SR.
Methods
A prospective study was conducted in a tertiary University hospital including 41 patients with symptomatic uncomplicated MS having favorable morphology with sinus Rhythm. P wave duration, amplitude and dispersion, NT-pro BNP, transthoracic and transesophageal echocardiography were carried out directly before and 1 month following PMV. Student t-test was used to compare the variables before and after PMV. Correlation was calculated using Pearson's correlation and multivariate regression analysis was used for prediction of unfavorable outcomes.
Results
After PMV, 36 (87.8%) patients had a favorable outcome manifested with improvement of NYHA class, valve area, estimated systolic pulmonary artery pressure (sPAP) as well as grade of spontaneous echo contrast (SEC). P wave duration, P wave amplitude and P wave dispersion decreased after PMV (14.97±2.65 vs. 13.21±2.36 ms, 4.01±1.01 vs. 2.51±0.71 ms and 4.01±1.01 vs. 2.51±0.71mv; P<0.001 respectively). NT pro-BNP also reduced (2.90±2.19 vs. 2.01±1.31 Pg/L; P<0.001). TEE PW of LAA showed increase of early (E LAA) and late (A LAA) emptying velocities after PMV (41.70±19.50 vs. 48.82±20.18 and 31.31±21.99 vs. 38.48±19.86 cm/s; P<0.001 respectively). By TDI, late wall motion (LAA A) velocity increased (7.41±2.50 vs. 8.23±3.01 cm/s; P<0.001) with an improvement of LAA ejection fraction post procedural (50.80±13.11 vs. 55.75±10.12%; P<0.001). Negative correlation between LAA EF and P wave amplitude (r=−0.40; P<0.001) as well as a correlation between reduction in NT pro-BNP and the improvement of both LAA A velocity and E LAA wave were noticed (r=0.55; P=0.02 and 0.01 respectively). The grade of SEC was negatively correlated with E LAA (r=−0.55, P=0.02). Only 5 patients (12.2%) had an unfavorable outcome. Four patients had severe mitral regurge (7.8%), only one patient (2.4%) was indicated for surgery. AF developed in one patient (2.4%). The grade of SEC remains the same in 3 patients (7.3%). Both baseline estimated sPAP and Wilkins score were predictors for unfavorable outcome; sPAP (odd's ratio= 4.08; 95% CI=1.01- 7.17; P=0.04); Wilkins score (odd's ratio= 1.59; 95% CI=1.22- 5.98; P=0.01).
Conclusion
PMV has a favorable rapid impact on LA and LAA properties in patients with MS and SR. Our data suggests that PMV could potentially contribute to lowering the risk of future thromboembolic events in those patients.
Funding Acknowledgement
Type of funding sources: Public Institution(s). Main funding source(s): Assiut University Hospital
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Affiliation(s)
- M Sayed
- Assiut University, Cardiovascular medicine department, Assiut, Egypt
| | - H Salah Gaber
- Sohag Cardiac Specialized Center, Cardiology, Sohag, Egypt
| | - M Z Abd Elrhman
- Assiut University, Clinical pathology department, Assiut, Egypt
| | - H A R Helmy
- Assiut University, Cardiovascular medicine department, Assiut, Egypt
| | - H Hasan-Ali
- Assiut University, Cardiovascular medicine department, Assiut, Egypt
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Sayed M, I H Awad P, Abouelnour A, Taha Kishk Y. The prognostic value of cardiac magnetic resonance in assessment of right ventricular function after percutaneous balloon mitral valvuloplasty. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.1619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Mitral stenosis (MS) results in right ventricular (RV) dysfunction secondary to chronic pulmonary hypertension. Poor outcomes have been reported in patients with persistent chronic RV dysfunction. Persistence RV dysfunction can affect the clinical improvement after percutaneous balloon mitral valvuloplasty (PBMV). Cardiac Magnetic Resonance (CMR) is emerged as a highly sensitive technique for assessment of RV function (RVF).
Purpose
To investigate RV function 3 months after PBMV using a variety of robust parameters associated with prognosis.
Methods
A prospective observational study was conducted in a tertiary University hospital included 31 patients with symptomatic uncomplicated MS with favorable morphology and having sinus rhythm who underwent PBMV. All patients were subjected to TTE and CMR examination 24 hours directly before and 3 months after PBMV for assessment of RV size and function.
Results
CMR showed reduced RV myocardial mass (36.1±6.1 vs 28.0±5.4g, P<0.001), RV end-diastolic volume (RV EDV) (123.5±31.3 vs 109.5±22.7 ml, P=0.03) and TR regurgitant fraction (19.6±8.6 vs 14.7±4.9%, P<0.001) On the other hand, there were increase in each of RV ejection fraction (60.0±10.4 vs 63.13±7.8%, P<0.001), RV stroke volume (SV) (50.2±15.1 vs 33.2±12.2 ml, P<0.001) and RV stroke index (44.2±7.7 vs 50.3±8.6 ml/beat/m2 <0.001). TTE showed improved systolic RV function parameters measured by fractional area change (42.1±7.8 vs 51.7±5.4%, P<0.00), Tei Index (0.6±0.1 vs 0.5±0.1, P<0.001) and TAPSE (22.2±3.3 vs 25.7±5.1 mm, P=0.04). Among RV diastolic parameters, there were an increase in TV-TDI E' (12.0±3.0 vs 14.0±2.0 cm/s, P<0.001), TV-TDI A' (13.0±3.0 vs 11.0±2.0 cm/s, P<0.001) and TV-TDI E'/A' (1.0±0.5 vs 1.3±0.3, P<0.001) with significantly decreased RV wall thickness (5.7±0.7 vs 4.3±0.8 mm P<0.001) 3 months after PBMV. Among patients who showing improved RV parameters by TTE, ten patients (32,3%) showed non improved RV end systolic volume, EDV, SV and stroke index by CMR.
Conclusion
Follow-up of RV function by TTE after PBMV yielded nearly similar results compared to CMR. However, CMR identified a subgroup of patient with persistent RV dysfunction 3 months after PBMV. That contributes to define the role of cardiac MRI in the evaluation of the prognosis in patients with MS.
Funding Acknowledgement
Type of funding sources: Public Institution(s). Main funding source(s): Assiut University hospital and Al Orman Institute
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Affiliation(s)
- M Sayed
- Assiut University, Cardiovascular Medicine Department, Assiut, Egypt
| | - P I H Awad
- Assiut University, Cardiovascular Medicine Department, Assiut, Egypt
| | - A Abouelnour
- Assiut University, Cardiovascular Medicine Department, Assiut, Egypt
| | - Y Taha Kishk
- Assiut University, Cardiovascular Medicine Department, Assiut, Egypt
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Mahmoud EM, Sayed M, Awaad M, El-Zomor ST, Blum M, Killinger A, Gadow R, Naga SM. Evaluation of Ti/Al alloy coated with biogenic hydroxyapatite as an implant device in dogs' femur bones. J Mater Sci Mater Med 2021; 32:119. [PMID: 34487244 PMCID: PMC8421309 DOI: 10.1007/s10856-021-06589-5] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 07/09/2021] [Indexed: 06/13/2023]
Abstract
The main target of the present research was a full assessment of the toxicity effects and biocompatibility of a Ti/Al-alloy device coated with biogenic hydroxyapatite (bHA) when implanted in dogs in comparison with those of an uncoated Ti/Al-alloy device. The coating of the alloy was carried out using controlled high-velocity suspension flame spray (HVSFS) technique. Both coated and uncoated devices were implanted in dogs' femur bones for different time periods (45 days and 90 days). Bone-formation ability and healing were followed up, and blood analysis was performed, at Time zero (immediately post surgery), and then at 3 days, 45 days, and 90 days post surgery. Bone mineral density checks, radiological scans of the femur bone, and histological analysis were also conducted. The in-vivo study results proved that implantation of a device made from bHA-coated Ti/Al alloy in dogs' femur bones is completely safe. This is due to the high osteoconductivity of the coated alloy, which enables the formation of new bone and a full connection between new and original bone material. At 90 days post surgery, the coated alloy had been completely digested within the original bone; thus, it appeared as a part of the femur bone and not as a foreign body. Both the scanning electron microscopy with energy-dispersive X-ray and histology analysis findings affirmed the results. Furthermore, the blood tests indicated no toxicity effects during the 90 days of implantation.
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Affiliation(s)
- E M Mahmoud
- Refractories, Ceramics and building materials Department, National Research Centre, Cairo, Egypt.
| | - M Sayed
- Refractories, Ceramics and building materials Department, National Research Centre, Cairo, Egypt
| | - M Awaad
- Refractories, Ceramics and building materials Department, National Research Centre, Cairo, Egypt
| | - S T El-Zomor
- Department of Surgery, Anaesthesiology and Radiology, Faculty of Veterinary Medicine, Cairo University, Cairo, Egypt
| | - M Blum
- Institute for Manufacturing Technologies of Ceramic Components and Composites (IMTCCC), Stuttgart University, Stuttgart, Germany
| | - A Killinger
- Institute for Manufacturing Technologies of Ceramic Components and Composites (IMTCCC), Stuttgart University, Stuttgart, Germany
| | - R Gadow
- Institute for Manufacturing Technologies of Ceramic Components and Composites (IMTCCC), Stuttgart University, Stuttgart, Germany
| | - S M Naga
- Refractories, Ceramics and building materials Department, National Research Centre, Cairo, Egypt
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Sayed M, Krishnamurthy B, Pal H. Unraveling the salt induced modulation in the photophysical behavior of acridine orange dye on its interaction with natural DNA. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116146] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Elfouly A, Awny M, Ibrahim MK, Aboelsaad M, Tian J, Sayed M. Effects of Long-Acting Testosterone Undecanoate on Behavioral Parameters and Na + , K +-ATPase mRNA Expression in Mice with Alzheimer`s Disease. Neurochem Res 2021; 46:2238-2248. [PMID: 34036518 DOI: 10.1007/s11064-021-03357-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 04/30/2021] [Accepted: 05/15/2021] [Indexed: 01/01/2023]
Abstract
Previous studies have shown that testosterone attenuates stress-induced mood dysfunction and memory deterioration. However, the exact mechanism is still unknown. This study was conducted to investigate the role of long-term testosterone undecanoate on the behavioral responses in AD induced by AlCl3 + D-galactose administration and the possible alteration of the gene expression level of the Na/K ATPase pump. Adult male mice received AlCl3 in drinking water (10 mg/kg/day) and (D-gal 200 mg/kg/day), subcutaneously for 90 consecutive days, then received a single intramuscular (I.M) injection of castor oil (vehicle) on day 91, while treated groups received a single I.M injection of either low (100 mg/kg/45 days) or high dose (500 mg/kg/45 days) respectively of long-acting testosterone undecanoate on day 91. The time spent in the interaction zone during the open field test, preference index to novel objects in the novel object recognition test, spontaneous alternation percentage (SAP) in Y-maze test, and escape latency time in the Morris water maze test were used to measure the locomotor activity, long-term memory, and spatial memory in mice, respectively. The results showed that testosterone undecanoate treatment improved locomotor activity, improved preference to novel objects, improved spatial memory, and reversed anxiety and depression induced by AlCl3 + D-galactose administration in male mice, suggesting the enhancement of behavioral and memory functions brought by testosterone treatment. Moreover, testosterone undecanoate treatment did alter gene expression levels of Na/K ATPase isoforms in the brain hippocampus. In most cases, altered gene expression was significant and correlated with the observed behavioral changes. Taken together, our findings provide new insight into the effects of long-acting testosterone undecanoate administration on locomotor activity, long-term memory, anxiety, and spatial memory in male mice with Alzheimer's disease.
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Affiliation(s)
- A Elfouly
- Department of Pharmacology, Faculty of Pharmacy, October 6Th University, Cairo, Egypt
| | - M Awny
- Department of Pharmacology, Faculty of Pharmacy, October 6Th University, Cairo, Egypt
| | - M K Ibrahim
- Department of Developmental Pharmacology, National Organization for Drug Control and Research (NODCAR), Giza, Egypt
| | - M Aboelsaad
- Department of Clinical Pharmacy Practice, Faculty of Pharmacy, The British University in Egypt, El Shorouk City, Egypt
| | - J Tian
- Department of Biomedical Sciences &, Marshall Institute of Interdisciplinary Research (MIIR), Marshall University, Huntington, WV, USA
| | - M Sayed
- Department of Clinical Pharmacy Practice, Faculty of Pharmacy, The British University in Egypt, El Shorouk City, Egypt. .,Center of Drug Research Development (CDRD), The British University in Egypt, El Shorouk City, Egypt.
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Mahmoud E, Sayed M, El-Kady AM, Elsayed H, Naga S. In vitro and in vivo study of naturally derived alginate/hydroxyapatite bio composite scaffolds. Int J Biol Macromol 2020; 165:1346-1360. [DOI: 10.1016/j.ijbiomac.2020.10.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Revised: 09/19/2020] [Accepted: 10/01/2020] [Indexed: 12/25/2022]
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Abdel Ghany M, Rashed M, Abbas A, Youssef A, Sayed M. Severe preeclampsia is associated with postpartum diastolic dysfunction and non-dipping blood pressure profile pattern. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Left ventricular diastolic dysfunction and non-dipping profile, detected by ambulatory blood pressure monitoring (ABPM), are two features recorded to be associated with sustained hypertension. Both are predictors of an increased cardiovascular morbidity later in life. Complete normalization of blood pressure (BP) in preeclampsia is detected over a variable period of time.
Methods
A prospective cohort study was conducted in a tertiary university hospital including normotensive women with a history of preeclampsia in the current pregnancy enrolled within the first week postpartum. All cases were subjected to 24 h-ABPM and 2D trans-thoracic echocardiography three months post postpartum concomitantly with a clinical evaluation. Chi2-test was used to compare the qualitative data while student t-test was used to compare the quantitative data. Multivariate regression analysis was used for prediction of non-dippers and diastolic dysfunction in our cohort.
Results
Hundred twenty eight women were included in the study. Their mean age was 28.6±5.1 years and the mean basal BP was 123.1±6.4/74.6±5.9 mm Hg. Out of the studied women, 90 (70.3%) women were dippers and 38 (29.7%) women were non-dippers. It was noticed that diastolic dysfunction was presented in 28 (73.7%) of non-dippers while none of dippers had diastolic dysfunction. Women with severe preeclampsia had higher frequency of non-dipper (35.5% vs. 24.2%; P=0.02) and diastolic dysfunction (29% vs. 15%; P=0.01) in comparison to those women with mild preeclampsia. Severe preeclampsia and previous history of preeclampsia were significant predictors for non-dipping status (OR=1.1, 95% CI: 0.05–10.56 and 1.4, 95% CI: 0.30–4.26 respectively, R2 = 0.7; P<0.001). They were also predictors for diastolic dysfunction in our studied population (OR = 1.6, 95% CI: 1.1–2.2 and 1.3, 95% CI: 1.2–2.2 respectively, R2 = 0.6; P<0.05).
Conclusion
Women with a history of preeclampsia have the risk for developing cardiovascular events later in life. The severity and recurrence of preeclampsia were significant predictors for both non-dipping profile and diastolic dysfunction.
Funding Acknowledgement
Type of funding source: Public hospital(s). Main funding source(s): Orman Heart Hospital-Assiut University; Women Health Hospital-Assiut University
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Affiliation(s)
- M Abdel Ghany
- Assiut University, Cardiovascular medicine department, Assiut, Egypt
| | - M Rashed
- Assiut University, Cardiovascular medicine department, Assiut, Egypt
| | - A Abbas
- Assiut University, Obstetrics and Gynecology department, Assiut, Egypt
| | - A.M.R Youssef
- Assiut University, Cardiovascular medicine department, Assiut, Egypt
| | - M Sayed
- Assiut University, Cardiovascular medicine department, Assiut, Egypt
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Sayed M, Balayan J, Singh PK, Pal H. Modulation of excited-state photodynamics of ESIPT probe 1′-hydroxy-2′-acetonaphthone (HAN) on interaction with bovine serum albumin. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112651] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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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15
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Sayed M, Gado RA, Naga SM, Colombo P, Elsayed H. Influence of the thermal treatment on the characteristics of porous geopolymers as potential biomaterials. Mater Sci Eng C Mater Biol Appl 2020; 116:111171. [PMID: 32806273 DOI: 10.1016/j.msec.2020.111171] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 06/03/2020] [Accepted: 06/05/2020] [Indexed: 11/24/2022]
Abstract
Highly porous sodium geopolymer structures were successfully produced through the chemical direct foaming approach at ambient temperature. The impact of the thermal treatment, as well as the influence of various additions of hydrogen peroxide, as a foaming agent, on the porosity, microstructure and mechanical characteristics of the produced geopolymers was investigated. The evaluation of bioactivity was carried out by assessing the formation of an apatite layer on the samples' surface, using scanning electronic microscopy and inductively coupled plasma spectrometry for the simulated body fluid solution, in which the geopolymer samples were kept up to 28 days. In addition, the biodegradability was estimated through the weight change of the samples and pH-measurements. The results demonstrated that the geopolymer foams, produced using 4.5 vol% H2O2 and heat-treated at 500 °C for 1 h, possessed a high open porosity (71 vol %), excellent compressive strength (3.56 ± 0.27 MPa), and suitable chemical stability. The pH value of SBF solutions, in which these geopolymers were immersed for 28 days, remained close to the physiological one. The in vitro study indicated that the developed geopolymer foams possessed bioactivity, as demonstrated by the formation of apatite particles on their surface after immersion in the simulated body fluid solution for 28 days.
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Affiliation(s)
- M Sayed
- Ceramics Department, National Research Centre, 12311 Dokki, Cairo, Egypt
| | - R A Gado
- Ceramics Department, National Research Centre, 12311 Dokki, Cairo, Egypt
| | - S M Naga
- Ceramics Department, National Research Centre, 12311 Dokki, Cairo, Egypt
| | - Paolo Colombo
- Department of Industrial Engineering, University of Padova, Padova, Italy; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA
| | - Hamada Elsayed
- Ceramics Department, National Research Centre, 12311 Dokki, Cairo, Egypt; Department of Industrial Engineering, University of Padova, Padova, Italy.
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16
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Sayed M, Tom DM, Pal H. Multimode binding and stimuli responsive displacement of acridine orange dye complexed with p-sulfonatocalix[4/6]arene macrocycles. Phys Chem Chem Phys 2020; 22:13306-13319. [PMID: 32510077 DOI: 10.1039/d0cp00030b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Interaction of acridine orange (AOH+) dye with water soluble anionic p-sulfonatocalix[n]arene (SCXn) hosts, SCX4 and SCX6, having different cavity dimensions, has been investigated using multispectroscopic techniques. Intriguing modulation in the photophysical properties of AOH+ upon interaction with SCXn hosts indicate the formation of different host-guest complexes at different regions of the host concentrations. At lower host concentrations, AOH+ undergoes SCXn assisted aggregation, causing a drastic reduction in fluorescence intensity. At higher host concentrations, aggregated-AOH+-SCXn complexes disintegrate and monomeric-AOH+-SCXn exo and inclusion complexes are eventually formed, leading to a huge fluorescence enhancement finally. Observed effects are more pronounced with SCX6 as compared to SCX4 host. Time-resolved fluorescence studies indicate that at very high host concentrations, there is also a diffusion-controlled dynamic quenching for both monomeric-AOH+-SCXn exo and inclusion complexes, caused by the free SCXn present in the solution, a phenomenon not reported before for such host-guest systems. The aggregated-AOH+-SCXn complexes at lower host concentration were employed to investigate displacement study using an antiviral drug, 1-adamantanamine (AD) and a neurotransmitter, acetylcholine (AcCh), as the competitive binders cum external stimuli, which resulted in a drastic recovery of the fluorescence reduced initially due to aggregation process. Though both the AOH+-SCXn systems act as efficient supramolecular assemblies in sensing AD and AcCh as the analytes through fluorescence "OFF-ON" mechanism, the effect is more pronounced for AOH+-SCX4 system as compared to AOH+-SCX6. SCXn induced interesting modulation in the photophysical properties of AOH+ and the stimulus responsive dye displacement observed for aggregated-AOH+-SCXn systems can expectedly find applications in fluorescence OFF-ON sensing, supramolecular functional materials and similar others.
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Affiliation(s)
- Mhejabeen Sayed
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India. and Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India.
| | - Dona M Tom
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
| | - Haridas Pal
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India. and Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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Abd El-Maksoud S, Sayed M, Badawy F, Fahmy E. DEVELOPMENT OF SOME TOLERANT YEAST (SACCHAROMYCES CEREVISIAE) STRAINS TO HEAT AND SALT STRESSES. Arab Universities Journal of Agricultural Sciences 2019; 27:579-584. [DOI: 10.21608/ajs.2019.43667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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18
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Sayed M, Abbas M, Abdel Moniem S, Ali MEM, Naga SM. Facile and Room Temperature Synthesis of Superparamagnetic Fe 3
O 4
/C Core/Shell Nanoparticles for Efficient Removal of Pb(II) From Aqueous Solution. ChemistrySelect 2019. [DOI: 10.1002/slct.201803939] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- M. Sayed
- Ceramics Department; National Research Center, El-Behouth Str.; 12622 Cairo Egypt
| | - Mohamed Abbas
- Ceramics Department; National Research Center, El-Behouth Str.; 12622 Cairo Egypt
- State Key Laboratory of Coal Conversion; Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001; China
| | - Shimaa M. Abdel Moniem
- Water Pollution Research Department, National Research Centre, 33 El Buhouth St., Dokki, Cairo; Egypt, P.O.12622
| | - M. E. M. Ali
- Water Pollution Research Department, National Research Centre, 33 El Buhouth St., Dokki, Cairo; Egypt, P.O.12622
| | - S. M. Naga
- Ceramics Department; National Research Center, El-Behouth Str.; 12622 Cairo Egypt
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19
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Abd-Elrahman M, Sayed M, Abu El-Fadl A, Abu-Sehly A, Hafiz M. The activation energies at glass transition temperatures and dynamic fragility of (Se90Te10)100- In glassy alloys. Thermochimica Acta 2019; 672:86-92. [DOI: 10.1016/j.tca.2018.11.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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20
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Sayed M, Gubbala GK, Pal H. Contrasting interactions of DNA-intercalating dye acridine orange with hydroxypropyl derivatives of β-cyclodextrin and γ-cyclodextrin hosts. NEW J CHEM 2019. [DOI: 10.1039/c8nj04067b] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The present study demonstrates contrasting binding interactions of acridine orange dye with HPβCD and HPγCD hosts, always illustrating fluoresence “turn on” in the case of HPβCD and showing an interesting fluorescence “off/on switching” in the case of the HPγCD host.
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Affiliation(s)
- Mhejabeen Sayed
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre
- Mumbai 400 085
- India
| | - Ganesh K. Gubbala
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre
- Mumbai 400 085
- India
| | - Haridas Pal
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre
- Mumbai 400 085
- India
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21
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Sayed M, Panjwani S, Pal H. Sulfated β-Cyclodextrin Templated Assembly and Disassembly of Acridine Orange: Unraveling Contrasting Binding Mechanisms and Light Off/On Switching. ChemistrySelect 2018. [DOI: 10.1002/slct.201801563] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Mhejabeen Sayed
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400 085 India
| | - Shirin Panjwani
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400 085 India
| | - Haridas Pal
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre, Mumbai 400 085, India & Homi Bhabha National Institute, Anushaktinagar; Mumbai 400 094 India
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22
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Naga SM, Sayed M, El-Maghraby HF, Awaad M. Investigation the impact of ZTA addition on the properties of nano biogenic hydroxyapatite. J Mater Sci Mater Med 2018; 29:55. [PMID: 29728853 DOI: 10.1007/s10856-018-6062-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Accepted: 04/18/2018] [Indexed: 06/08/2023]
Abstract
The target of the recent study is to achieve a significant inexpensive and eco-friendly way for getting ZTA/HA composites, based on the nano-HA derived from the eggshell biogenic source. Combining simultaneously the porous structure; which is considered as a bone formation key, with developed mechanical properties and adequate biocompatibility, is another purpose of this study. Furthermore, the impact of ZTA addition from 10-30 mass-%, fabricated by uniaxial pressing and sintering at 1200-1300 °C for 2 h, on the physical and mechanical properties, microstructure and phase composition of ZTA/HA composite bodies was investigated. The results demonstrated that the increasing of ZTA content increases the bodies' apparent porosity and decreases the bulk density due to the decomposition of HA into β-TCP. Where the formation of β-TCP possessed the predominant impact on the mechanical properties of the sintered ZTA/HA composites. ICP, SEM, EDX and thin film XRD results of composites containing 20 mass-% ZTA affirmed the excellent bioactivity of the bodies.
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Affiliation(s)
- S M Naga
- Ceramics Department, National Research Center, El-Bohous Str., Cairo, 12622,, Egypt
| | - M Sayed
- Ceramics Department, National Research Center, El-Bohous Str., Cairo, 12622,, Egypt.
| | - H F El-Maghraby
- Ceramics Department, National Research Center, El-Bohous Str., Cairo, 12622,, Egypt
| | - M Awaad
- Ceramics Department, National Research Center, El-Bohous Str., Cairo, 12622,, Egypt
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23
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El-Begermy M, El-Begermy M, Sayed M. Median palatoplasty in management of midline thick palate, A missed cause of obstructive sleep apnea (OSA). Sleep Med 2017. [DOI: 10.1016/j.sleep.2017.11.256] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Tawfik M, Taman M, Tarbay A, Sayed M, Awad K. Circulatory collapse in a parturient undergoing cesarean delivery: a diagnostic dilemma. Int J Obstet Anesth 2017; 31:91-96. [DOI: 10.1016/j.ijoa.2017.05.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2017] [Revised: 04/10/2017] [Accepted: 05/04/2017] [Indexed: 10/19/2022]
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25
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Sayed M, Jha S, Pal H. Complexation induced aggregation and deaggregation of acridine orange with sulfobutylether-β-cyclodextrin. Phys Chem Chem Phys 2017; 19:24166-24178. [DOI: 10.1039/c7cp03135a] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The present study illustrates intriguing switching of multi-mode binding interactions of acridine orange dye with a sulfobutylether-β-cyclodextrin host.
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Affiliation(s)
- Mhejabeen Sayed
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
| | - Shruti Jha
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
| | - Haridas Pal
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
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26
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Sayed M, Krishnamurthy B, Pal H. Unraveling multiple binding modes of acridine orange to DNA using a multispectroscopic approach. Phys Chem Chem Phys 2016; 18:24642-53. [PMID: 27545984 DOI: 10.1039/c6cp03716j] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interaction of acridine orange (AOH(+)) with calf thymus DNA (ct-DNA) under different dye-DNA conditions has been investigated in detail using multispectroscopic techniques, unraveling a number of hitherto unexplored intricacies of dye-DNA binding. The observed results intriguingly show contrasting binding features when low (2.4 μM) and significantly high (23 μM) dye concentrations are used. It is conclusively inferred from absorption, steady-state fluorescence, circular dichroism, fluorescence decay and anisotropy decay studies that at low [DNA] to [dye] ratio, especially with higher dye concentration, dimeric AOH(+) predominantly binds externally to DNA surfaces through electrostatic interactions. At sufficiently high [DNA] to [dye] ratios, however, the interaction intriguingly changes to monomeric AOH(+) bound to DNA, predominantly in the intercalative mode between DNA base pairs, with partly an electrostatic binding on DNA surfaces. With very low initial dye concentration, monomeric (AOH(+)) mostly binds to DNA through intercalative and electrostatic modes for most DNA to dye ratios. The present study demonstrates a systematic correlation of the striking changes in the photophysical properties of the dye upon multimode binding with DNA. The observed results are of great significance in understanding the fundamental insights of dye/drug binding to DNA hosts, of use in the design of effective therapeutic agents.
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Affiliation(s)
- Mhejabeen Sayed
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
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27
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Sayed M, Shinde K, Shah R, Pal H. pH-Responsive Indicator Displacement Assay of Acetylcholine Based on Acridine-p-Sulfonatocalix[4]arene Supramolecular System: Fluorescence Off/On Switching and Reversible pKaShift. ChemistrySelect 2016. [DOI: 10.1002/slct.201600226] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Mhejabeen Sayed
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400 085 India
| | - Ketaki Shinde
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400 085 India
| | - Ramesh Shah
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400 085 India
| | - Haridas Pal
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400 085 India
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28
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Sayed M, Zahran A, Hassan M, Mohamed D. Circulating Tumor Cells and Cancer Stem Cells: Clinical Implications in Nonmetastatic Breast Cancer. Breast Cancer�(Auckl) 2016; 10:10.4137_BCBCR.S40856. [PMID: 35173437 PMCID: PMC8842436 DOI: 10.4137/bcbcr.s40856] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Revised: 10/13/2016] [Accepted: 10/17/2016] [Indexed: 11/17/2022] Open
Abstract
Purpose Despite the therapeutic advances, disease recurrence remains an ever-present threat to the health and well-being of breast cancer survivors. Assessment of circulating tumor cells (CTCs) and cancer stem cells (CSCs) during and after treatment may be of value in refining treatment. Methods Three 5 mL blood samples were taken from each patient: the first, at diagnosis; the second, after completion of neoadjuvant anthracyclin-based chemotherapy; and the third, a month after surgery and completion of adjuvant radiotherapy. The absolute numbers of CTCs were identified as CD45-cytokeratin+ cells. CTCs per 5 mL of blood were determined by recording all events in the whole suspension. CSCs were identified as cytokeratin+CD44+CD24-/CD45- cells. The CSCs were expressed as a percentage of CTCs. Results Univariate analysis identified the measurements of baseline CTCs and CSCs, taken after chemotherapy and one month after the cessation of radiotherapy, as prognostic factors for both four-year disease-free survival and four-year overall survival. Multivariable analysis identified the third measurement of CSCs, taken one month after the completion of radiotherapy, as the only independent prognostic factor for the four-year disease-free survival (P < 0.002, hazard ratio [HR] = 1.231, 95% CI 1.077–1.407). The initial CTC measurement was the one factor that reached significance on multivariate analysis (P < 0.03, HR 1.969, 95% CI 1.092–3.551) for the four-year overall survival. Correlation was higher between CTC and CSC counts at diagnosis (r = 0.654, P < 0.001) than after chemotherapy (r = 0.317, P < 0.03), because of the more rapid decrease in the mean CTC count with chemotherapy. Conclusion The CTC count could be suitable as one of the measures for monitoring response to chemotherapy, while persistence of CSC after cessation of the treatment of nonmetastatic breast cancer, except hormonal therapy when indicated, may be a reason to consider additional therapy in the future. These findings need confirmation in larger randomized trials.
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Affiliation(s)
- M. Sayed
- Department of Radiation Oncology, South Egypt Cancer Institute, Assiut University, Assiut, Egypt
| | - A.M. Zahran
- Department of Clinical Pathology, South Egypt Cancer Institute, Assiut University, Assiut, Egypt
| | - M.S.F. Hassan
- Department of Medical Oncology, South Egypt Cancer Institute, Assiut University, Assiut, Egypt
| | - D.O. Mohamed
- Department of Radiation Oncology, South Egypt Cancer Institute, Assiut University, Assiut, Egypt
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Liersch S, Henze V, Sterdt E, Sayed M, Röbl M, Schnitzerling J, Suermann T, Mayr E, Krauth C, Walter U. [Effectiveness and Cost-Effectiveness of Daily School Sport in the Primary School--Project: "fit for pisa"]. Gesundheitswesen 2015; 77 Suppl 1:S72-3. [PMID: 23954984 DOI: 10.1055/s-0032-1331251] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The "fit for pisa" intervention implemented daily physical education at five primary schools in Göttingen. The results of the evaluation show an increase in physical activity among the students participating in the programme. At the same time sedentary behaviour, like watching television, decreased remarkably. In the long run the promotion of an active lifestyle had improved the body mass index. The study emphasises the need for government funding to implement the programme across the country.
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Affiliation(s)
- S Liersch
- Institut für Epidemiologie, Sozialmedizin und Gesundheitssystemforschung, Medizinische Hochschule Hannover
| | - V Henze
- Allgemeiner Sport-Club Göttingen von 1846 e.V., Göttingen
| | - E Sterdt
- Institut für Epidemiologie, Sozialmedizin und Gesundheitssystemforschung, Medizinische Hochschule Hannover
| | - M Sayed
- Institut für Epidemiologie, Sozialmedizin und Gesundheitssystemforschung, Medizinische Hochschule Hannover
| | - M Röbl
- Universitätskinderklinik Göttingen, Pädiatrie II, Göttingen
| | | | - T Suermann
- Kassenärztlichen Vereinigung Niedersachsen, Präventionsbeauftragter, Göttingen
| | - E Mayr
- Gesundheitsamt für die Stadt und den Landkreis Göttingen
| | - C Krauth
- Institut für Epidemiologie, Sozialmedizin und Gesundheitssystemforschung, Medizinische Hochschule Hannover
| | - U Walter
- Institut für Epidemiologie, Sozialmedizin und Gesundheitssystemforschung, Medizinische Hochschule Hannover
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Sayed M, Sundararajan M, Mohanty J, Bhasikuttan AC, Pal H. Photophysical and Quantum Chemical Studies on the Interactions of Oxazine-1 Dye with Cucurbituril Macrocycles. J Phys Chem B 2015; 119:3046-57. [DOI: 10.1021/jp509243j] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Mhejabeen Sayed
- Radiation & Photochemistry Division and ‡Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Mahesh Sundararajan
- Radiation & Photochemistry Division and ‡Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Jyotirmayee Mohanty
- Radiation & Photochemistry Division and ‡Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Achikanath C. Bhasikuttan
- Radiation & Photochemistry Division and ‡Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Haridas Pal
- Radiation & Photochemistry Division and ‡Theoretical Chemistry Section, Chemistry Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
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31
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Sayed M, Pal H. pH-Assisted control over the binding and relocation of an acridine guest between a macrocyclic nanocarrier and natural DNA. Phys Chem Chem Phys 2015; 17:9519-32. [DOI: 10.1039/c4cp05335d] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Controlled binding and relocation of a dye–drug between a macrocyclic nanocarrier and natural DNA is demonstrated using pH as a stimulus.
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Affiliation(s)
- Mhejabeen Sayed
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
| | - Haridas Pal
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
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Sayed M, Biedermann F, Uzunova VD, Assaf KI, Bhasikuttan AC, Pal H, Nau WM, Mohanty J. Triple emission from p-dimethylaminobenzonitrile-cucurbit[8]uril triggers the elusive excimer emission. Chemistry 2014; 21:691-6. [PMID: 25393034 DOI: 10.1002/chem.201404902] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [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: 08/18/2014] [Indexed: 11/08/2022]
Abstract
The intriguing dual-emission behavior of p- dimethylaminobenzonitrile (DMABN) and the identity of the associated excited states is, arguably, the most extensively investigated and also controversially discussed molecule- specific phenomenon of modern photochemistry. We have now found a new, third fluorescence band when DMABN is encapsulated within the water-soluble molecular container cucurbit[8]uril (CB8). It is centered between the previously observed emissions and assigned to the elusive excimer emission from DMABN through 1:2 CB8:DMABN complex formation. Heating of the CB8⋅(DMABN)2 complex from 0 to 100 °C results in the dissociation of the ternary complex and restoration of the dual-emission properties of the monomer. Alternatively, monomer emission can be obtained by selecting cucurbit[7]uril (CB7), a host homologue that is too small to accommodate two DMABN molecules, or by introducing ethyl instead of methyl groups at the amino terminus of the aminobenzonitrile guest.
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Affiliation(s)
- Mhejabeen Sayed
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085 (India), Fax: (+91) 22-25505151/25519613
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Kumbhakar M, Manna A, Sayed M, Kumar A, Pal H. Observation of the Marcus Inverted Region for Bimolecular Photoinduced Electron-Transfer Reactions in Viscous Media. J Phys Chem B 2014; 118:10704-15. [DOI: 10.1021/jp506885r] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Manoj Kumbhakar
- Radiation
and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Arpan Manna
- Physical
and Material Chemistry Division, CSIR-National Chemical Laboratory, H. J. Bhabha Road, Pune 411 008, India
| | - Mhejabeen Sayed
- Radiation
and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Anil Kumar
- Physical
and Material Chemistry Division, CSIR-National Chemical Laboratory, H. J. Bhabha Road, Pune 411 008, India
| | - Haridas Pal
- Radiation
and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
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Elzawawy A, Tayel M, Sayed M, Waked E, Elgendy S, Abdelrazek S. AB0507 Role of IL-10 Gene Polymorphism in Clinicopathological Presentations and Treatment Response in Lupus Nephritis Patients. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.3084] [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: 11/04/2022]
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Manna A, Sayed M, Kumar A, Pal H. Atypical Energetic and Kinetic Course of Excited-State Intramolecular Proton Transfer (ESIPT) in Room-Temperature Protic Ionic Liquids. J Phys Chem B 2014; 118:2487-98. [DOI: 10.1021/jp500281z] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Arpan Manna
- Physical and Material
Chemistry Division, National Chemical Laboratory, H. J. Bhabha Road, Pune 411 008, India
| | - Mhejabeen Sayed
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Anil Kumar
- Physical and Material
Chemistry Division, National Chemical Laboratory, H. J. Bhabha Road, Pune 411 008, India
| | - Haridas Pal
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
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Sayed M, Liersch S, Windel I, Krauth C, Altgeld T, Walter U. Schulentwicklung durch Gesundheitsmanagement: Kennzahlentoolbox als Qualitätssicherungsinstrument für Selbstevaluation an Schulen. Gesundheitswesen 2013; 77 Suppl 1:S80-1. [DOI: 10.1055/s-0033-1334891] [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: 10/26/2022]
Affiliation(s)
- M. Sayed
- Institut für Epidemiologie, Sozialmedizin und Gesundheitssystemforschung, Medizinische Hochschule Hannover
| | - S. Liersch
- Institut für Epidemiologie, Sozialmedizin und Gesundheitssystemforschung, Medizinische Hochschule Hannover
| | - I. Windel
- Landesvereinigung für Gesundheit und Akademie für Sozialmedizin Niedersachsen e.V
| | - C. Krauth
- Institut für Epidemiologie, Sozialmedizin und Gesundheitssystemforschung, Medizinische Hochschule Hannover
| | - T. Altgeld
- Landesvereinigung für Gesundheit und Akademie für Sozialmedizin Niedersachsen e.V
| | - U. Walter
- Institut für Epidemiologie, Sozialmedizin und Gesundheitssystemforschung, Medizinische Hochschule Hannover
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Liersch S, Sayed M, Windel I, Altgeld T, Krauth C, Walter U. Balanced Scorecard als unterstützendes Instrument zur gesundheitsfördernden Schulentwicklung. Gesundheitswesen 2013. [DOI: 10.1055/s-0033-1354226] [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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Sayed M, Liersch S, Windel I, Altgeld T, Krauth C, Walter U. Gesundheitsmanagement an Schulen - das Projekt „Gesund Leben Lernen“. Gesundheitswesen 2013. [DOI: 10.1055/s-0033-1354219] [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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Thabet K, El-Moez MA, EL-Haddad M, Sayed M, El-Sherbiny N, El-Kashef A, El-Mesidy S. PO-0629 IMRTAND REGIONAL NODAL IRRADIATION IN LEFT SIDED BREAST CANCER PATIENTS CAN SPARE MORE NORMAL TISSUES. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)70962-3] [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: 10/28/2022]
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Liersch S, Sayed M, Windel I, Altgeld T, Krauth C, Walter U. Integration of health management in schools using the Balanced Scorecard as a strategic management instrument. J Public Health (Oxf) 2011. [DOI: 10.1007/s10389-011-0465-8] [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: 11/28/2022] Open
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Sayed M, Liersch S, Bisson S, Windel I, Altgeld T, Krauth C, Walter U. Entwicklung einer Kennzahlentoolbox zur Selbstevaluation gesundheitsfördernder Maßnahmen an Schulen. Gesundheitswesen 2011. [DOI: 10.1055/s-0031-1283604] [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: 10/17/2022]
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Liersch S, Bisson S, Sayed M, Windel I, Altgeld T, Krauth C, Walter U. Gesundheitsförderung unter Einsatz der Balanced Scorecard im schulischen Gesundheitsmanagement. Gesundheitswesen 2010. [DOI: 10.1055/s-0030-1266274] [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: 10/19/2022]
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Halalsheh M, Dalahmeh S, Sayed M, Suleiman W, Shareef M, Mansour M, Safi M. Grey water characteristics and treatment options for rural areas in Jordan. Bioresour Technol 2008; 99:6635-6641. [PMID: 18299193 DOI: 10.1016/j.biortech.2007.12.029] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2006] [Revised: 11/26/2007] [Accepted: 12/01/2007] [Indexed: 05/26/2023]
Abstract
Low water consumption in rural areas in Jordan had resulted in the production of concentrated grey water. Average COD, BOD and TSS values were 2568mg/l, 1056mg/l and 845mg/l, respectively. The average grey water generation was measured to be 14L/c.d. Three different treatment options were selected based on certain criterions, and discussed in this article. The examined treatment systems are septic tank followed by intermittent sand filter; septic tank followed by wetlands; and UASB-hybrid reactor. Advantages and disadvantages of each system are presented. It was concluded that UASB-hybrid reactor would be the most suitable treatment option in terms of compactness and simplicity in operation. The volume of UASB-hybrid reactor was calculated to be 0.268m(3) with a surface area of 0.138m(2) for each house having 10 inhabitants on average. Produced effluent is expected to meet Jordanian standards set for reclaimed water reuse in irrigating fruit trees.
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Affiliation(s)
- M Halalsheh
- Water and Environmental Research and Study Center, University of Jordan, Amman, Jordan.
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Ali M, Sayed M. 89 POSTER Contribution of nitric oxide and epidermal growth factor receptor in antimetastatic potential of paclitaxel in human liver cancer cell (HebG2). EJC Suppl 2006. [DOI: 10.1016/s1359-6349(06)70095-7] [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: 11/30/2022] Open
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Tastan Bishop Ő, Tsekoa T, Sewell T, Cameron R, Sayed M, Cowan D. Crystal structure of nitrile hydratases: possible industrial usage. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305090914] [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: 11/10/2022] Open
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Aloui N, Nessib N, Jalel C, Ellouze S, Ben Chehida F, Sayed M, Bellagha I, Ghachem M, Hammou A. [Acute osteomyelitis in children: early MRI diagnosis]. ACTA ACUST UNITED AC 2005; 85:403-8. [PMID: 15213650 DOI: 10.1016/s0221-0363(04)97599-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [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: 11/20/2022]
Abstract
PURPOSE To assess the value of MRI for early diagnosis of osteomyelitis in children presenting with sepsis and acute onset of musculoskeletal pain. MATERIALS AND METHODS MRI including fat suppressed T2W, and fat suppressed pre- and postcontrast T1W sequences was performed within 48 hours of admission in 26 children with clinical (fever and acute musculoskeletal pain) and biological (elevated WBC count and ESR in all cases, and elevated CRP in 12 patients) suspicion of acute osteomyelitis. None of the patients had sickle cell disease. RESULTS MRI was normal in 7 children (26%). Bone marrow signal abnormality was noted in 19 cases (74%) consistent with acute osteomyelitis in 18 cases and metastatic neuroblastoma in 1 case. CONCLUSION MRI is useful for evaluation of children presenting with sepsis and acute musculoskeletal pain, early diagnosis of osteomyelitis and to prevent unnecessary hospital admission and work-up.
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Affiliation(s)
- N Aloui
- Service de radiologie, Hôpital d'enfant de Tunis, Tunisie
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Himpel S, Panzer P, Eirmbter K, Czajkowska H, Sayed M, Packman LC, Blundell T, Kentrup H, Grötzinger J, Joost HG, Becker W. Identification of the autophosphorylation sites and characterization of their effects in the protein kinase DYRK1A. Biochem J 2001; 359:497-505. [PMID: 11672423 PMCID: PMC1222170 DOI: 10.1042/0264-6021:3590497] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Protein kinases of the DYRK ('dual-specificity tyrosine-regulated kinase') family are characterized by a conserved Tyr-Xaa-Tyr motif (Tyr-319-Tyr-321) in a position exactly corresponding to the activation motif of the mitogen-activated protein kinase (MAP kinase) family (Thr-Xaa-Tyr). In a molecular model of the catalytic domain of DYRK1A, the orientation of phosphorylated Tyr-321 is strikingly similar to that of Tyr-185 in the known structure of the activated MAP kinase, extracellular-signal-regulated kinase 2. Consistent with our model, substitution of Tyr-321 but not of Tyr-319 by phenylalanine markedly reduced the enzymic activity of recombinant DYRK1A expressed in either Escherichia coli or mammalian cells. Direct identification of phosphorylated residues by tandem MS confirmed that Tyr-321, but not Tyr-319, was phosphorylated. When expressed in COS-7 cells, DYRK1A was found to be fully phosphorylated on Tyr-321. A catalytically inactive mutant of DYRK1A contained no detectable phosphotyrosine, indicating that Tyr-321 is autophosphorylated by DYRK1A. MS identified Tyr-111 and Ser-97 as additional autophosphorylation sites in the non-catalytic N-terminal domain of bacterially expressed DYRK1A. Enzymic activity was not affected in the DYRK1A-Y111F mutant. The present experimental data and the molecular model indicate that the activity of DYRK1A is dependent on the autophosphorylation of a conserved tyrosine residue in the activation loop.
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Affiliation(s)
- S Himpel
- Institut für Pharmakologie und Toxikologie, Medizinische Fakultät der RWTH Aachen, Wendlingweg 2, D-52057 Aachen, Germany
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Sayed M, Pelech S, Wong C, Marotta A, Salh B. Protein kinase CK2 is involved in G2 arrest and apoptosis following spindle damage in epithelial cells. Oncogene 2001; 20:6994-7005. [PMID: 11704824 DOI: 10.1038/sj.onc.1204894] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2001] [Revised: 07/17/2001] [Accepted: 08/02/2001] [Indexed: 11/09/2022]
Abstract
p53 undergoes phosphorylation on several residues in response to cellular stresses that include UV and ionizing radiation, however the influence of spindle damage on this parameter is relatively unclear. Consequently, the effect of nocodazole on serine 392 phosphorylation was examined in two epithelial cell lines. We show that this process is dependent upon the stepwise activation of p38 mitogen-activated protein kinase (p38 MAPK) and protein kinase casein kinase 2 (CK2). Furthermore, this activation correlated with the biochemical regulation of the maturation-promoting factor (MPF, cdc2/cyclin B), as both DRB and antisense depletion of CK2, as well as SB203580 were associated with an inhibition of its activation in response to nocodazole. Strikingly, when the cell cycle characteristics of nocodazole treated cells were examined, we observed that depletion or inhibition of the catalytic subunit of CK2, in the presence of microtubule inhibitors, resulted in a compromise of the G2 arrest (spindle checkpoint). Furthermore, CK2-depleted, nocodazole treated cells demonstrated a dramatic reduction in the apoptotic cell fraction, confirming that these cells had been endowed with oncogenic properties. These changes were observed in both HeLa cells and HCT116 cells. We also show that this effect is dependent on the presence of functional wild-type p53, as this phenomenon is not apparent in HCT116 p53(-/-) cells. Collectively, our results indicate two novel roles for CK2 in the spindle checkpoint arrest, in concert with p53. Firstly, to maintain increased cyclinB/cdc2 kinase activity, as a component of G2 arrest, and secondly, a role in p53-mediated apoptosis. These findings may have implications for an improved understanding of abnormalities of the spindle checkpoint in human cancers, which is a prerequisite for defining future therapies.
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Affiliation(s)
- M Sayed
- The Department of Experimental Medicine, Jack Bell Research Center, University of British Columbia, 2660 Oak Street, Vancouver, British Columbia V6H 3Z6, Canada
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Abstract
Most of the psychoanalytic literature on the mother tongue has focused on the clinical therapeutic encounter. The authors applied findings from therapy research using the Thematic Apperception Test (TAT) to tease out differences and similarities in how stories are told in the mother tongue versus the acquired language. This projective test provides a rich medium to explore the individual's inner world, fantasies, thoughts, wishes, sense of self, and self-in-relation-to-other via a narrative that is spontaneously produced in response to standardized stimuli. The TAT was administered to four participants in both the mother tongue and the acquired language. The narratives were then analyzed using two different rating systems. Differences in sense of self, self-in-relation-to-other, and level of pathology were identified using one participant's narratives. Although no global generalizations can be made from one study, the authors suggest that people tell their story differently when speaking in the mother tongue versus the acquired language.
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