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Karaman-Jurukovska N, Hamzavi I, Kohli I, Nicholson C, Mohammad T, Nahhas A, Braunberger T, Matsui M, Mammone T. 633 Comparison of soluble proteins from skin sections of acne and TCA induced postinflammatory hyperpigmentation and erythema. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.05.644] [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: 11/28/2022]
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2
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Abu Elwafa N, Mohammad T, Wageh H, Elias M, Nabhan M, Salah Hassan N, Rehan Youssef A. Fascia Healing after Induced Tibialis Anterior Muscle Strain: an Experimental Study in Wistar Rats. Muscles Ligaments Tendons J 2022. [DOI: 10.32098/mltj.02.2022.06] [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: 11/05/2022]
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Khalil H, Aldaajani ZF, Aldughmi M, Al-Sharman A, Mohammad T, Mehanna R, El-Jaafary SI, Dahshan A, Ben Djebara M, Kamel WA, Amer HA, Farghal M, Abdulla F, Al-Talai N, Snineh MA, Farhat N, Jamali FA, Matar RK, Abdelraheem HS, Ghonimi NAM, Al-Melh MA, Elbhrawy S, Alotaibi MS, Elaidy SA, Almuammar SA, Al-Hashel JY, Gouider R, Samir H, Mhiri C, Skorvanek M, Lin J, Martinez-Martin P, Stebbins GT, Luo S, Goetz CG, Bajwa JA. Validation of the Arabic Version of the Movement Disorder Society-Unified Parkinson's Disease Rating Scale. Mov Disord 2022; 37:826-841. [PMID: 35218056 DOI: 10.1002/mds.28905] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2021] [Accepted: 11/06/2021] [Indexed: 11/07/2022] Open
Abstract
BACKGROUND The Movement Disorder Society-Unified Parkinson's Disease Rating Scale (MDS-UPDRS) has become the gold standard for evaluating different domains in Parkinson's disease (PD), and it is commonly used in clinical practice, research, and clinical trials. OBJECTIVES The objectives are to validate the Arabic-translated version of the MDS-UPDRS and to assess its factor structure compared with the English version. METHODS The study was carried out in three phases: first, the English version of the MDS-UPDRS was translated into Arabic and subsequently back-translated into English by independent translation team; second, cognitive pretesting of selected items was performed; third, the Arabic version was tested in over 400 native Arabic-speaking PD patients. The psychometric properties of the translated version were analyzed using confirmatory factor analysis (CFA) as well as exploratory factor analysis (EFA). RESULTS The factor structure of the Arabic version was consistent with that of the English version based on the high CFIs for all four parts of the MDS-UPDRS in the CFA (CFI ≥0.90), confirming its suitability for use in Arabic. CONCLUSIONS The Arabic version of the MDS-UPDRS has good construct validity in Arabic-speaking patients with PD and has been thereby designated as an official MDS-UPDRS version. The data collection methodology among Arabic-speaking countries across two continents of Asia and Africa provides a roadmap for validating additional MDS rating scale initiatives and is strong evidence that underserved regions can be energically mobilized to promote efforts that apply to better clinical care, education, and research for PD. © 2022 International Parkinson and Movement Disorder Society.
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Affiliation(s)
- Hanan Khalil
- Department of Physical Therapy and Rehabilitation Sciences, College of Health Sciences, QU Health, Qatar University, Doha, Qatar.,Faculty of Applied Medical Sciences, Department of Rehabilitation Sciences, Jordan University of Science and Technology, Irbid, Jordan
| | | | - Mayis Aldughmi
- Department of Physiotherapy, School of Rehabilitation Sciences, University of Jordan, Amman, Jordan
| | - Alham Al-Sharman
- Faculty of Applied Medical Sciences, Department of Rehabilitation Sciences, Jordan University of Science and Technology, Irbid, Jordan
| | - Tareq Mohammad
- National Neuroscience Nursing Administration, Executive Administration of Nursing Affairs, Riyadh, Saudi Arabia
| | - Raja Mehanna
- University of Texas Health Science Center at Houston - McGovern Medical School, Houston, Texas, USA
| | - Shaimaa I El-Jaafary
- Neurology Department, Kasr Al-Ainy School of Medicine, Cairo University, Cairo, Egypt
| | - Ahmed Dahshan
- Neurology Department, Kasr Al-Ainy School of Medicine, Cairo University, Cairo, Egypt
| | - Mouna Ben Djebara
- Department of Neurology, Clinical Investigation Center - Razi University Hospital, Faculté de Médecine de Tunis, Université Tunis El Manar, Tunis, Tunisia
| | - Walaa A Kamel
- Neurology department, Beni-Suef University, Egypt.,Neurology Department- Ibn Sina Hospital, Kuwait City, Kuwait
| | - Hanan A Amer
- Kasr Al-Ainy School of Medicine, Cairo University, Cairo, Egypt
| | | | - Fatema Abdulla
- Clinical Neuroscience Department, Salmaniya Medical Complex, Manama, Bahrain
| | | | | | - Nouha Farhat
- Department of Neurology, Clinical Investigation Center - Habib Bourguiba Hospital University Center, Sfax, Tunisia
| | | | - Rawan K Matar
- Neurology Division, Al-Adan Hospital, Kuwait City, Kuwait
| | - Heba S Abdelraheem
- Department of Neurology, Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | | | | | - Sonia Elbhrawy
- Department of Neurology, Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | | | | | | | - Jasem Y Al-Hashel
- Neuroscience Centre, King Fahd Specialist Hospital, Dammam, Saudi Arabia
| | - Riadh Gouider
- Department of Neurology, Clinical Investigation Center - Razi Hospital, Faculté de Médecine de Tunis, Tunis El Manar University, Tunis, Tunisia
| | - Hatem Samir
- Kasr Al-Ainy School of Medicine, Cairo University, Cairo, Egypt
| | - Chokri Mhiri
- Cell Therapy Center, University of Jordan, Amman, Jordan
| | - Matej Skorvanek
- Department of Neurology, P. J. Safarik University, Kosice, Kosice, Slovak Republic.,Department of Neurology, University Hospital of L. Pasteur, Kosice, Slovak Republic
| | - Jeffrey Lin
- Department of Biostatistics and Data Science, The University of Texas Health Science Center at Houston, Houston, Texas, USA
| | - Pablo Martinez-Martin
- Center for Networked Biomedical Research in Neurodegenerative Diseases (CIBERNED), Carlos III Institute of Health, Madrid, Spain
| | - Glenn T Stebbins
- Department of Neurological Sciences, Rush University Medical Center, Chicago, Illinois, USA
| | - Sheng Luo
- Department of Biostatistics and Bioinformatics, Duke University, Durham, North Carolina, USA
| | - Christopher G Goetz
- Department of Neurological Sciences, Rush University Medical Center, Chicago, Illinois, USA
| | - Jawad A Bajwa
- Department of Neurology, National Neuroscience Institute, King Fahad Medical City, Riyadh, Saudi Arabia
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Islam MA, Rahman MM, Mohammad T, Kabir H, Chowdhury NH. Antrochaonal Polyp in a 4 Years Old Child. Bangladesh J of Otorhinolaryngology 2021. [DOI: 10.3329/bjo.v27i2.56367] [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: 11/05/2022]
Abstract
Antrochoanal polyp (ACP) is a benign, solitary polypoidal lesion arises from the maxillary antral mucosa that traverses through the ostium to the choana extending in a variable extent to the naso/oropharynx. It is usually unilateral and appears mainly in adults and rarely in children. It should be on differential diagnosis of any patients with nasal obstruction and chronic nasal discharge. Nasal endoscopy, computed tomography (CT), cone beam computed tomography (CBCT) and magnetic resonance imaging (MRI) are the main diagnostic techniques. Complete endoscopic surgical removal from the antral portionis recommended to prevent recurrence. Here a 4-year-old child of antrochoanal polyp that underwent functional endoscopic sinus surgery (FESS) with complete clearance from the maxillary antrum is presented.
Bangladesh J Otorhinolaryngol 2021; 27(2): 188-193
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Buabbas AJ, Mohammad T, Ayed AK, Mallah H, Al-Shawaf H, Khalfan AM. Evaluating the success of the tele-pathology system in governmental hospitals in Kuwait: an explanatory sequential mixed methods design. BMC Med Inform Decis Mak 2021; 21:229. [PMID: 34340685 PMCID: PMC8326651 DOI: 10.1186/s12911-021-01567-x] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 06/29/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Telepathology is the practice of reviewing and exchanging pathological images through telecommunication systems to obtain diagnoses remotely. Studying the factors that make such a system successful and favourable is important to ensure the merits of its implementation in clinical practice. OBJECTIVE This study aims to evaluate the success of a telepathology system from the users' perspectives, using specific evaluation criteria, namely: system quality, information quality, technical service quality, user satisfaction, and benefits. METHODS A sequential explanatory mixed methods design was adopted in this study, which consists of two phases. Initially, a questionnaire was distributed via WhatsApp to all of the pathologists (total: 45) working at governmental hospitals in Kuwait. Followed by, semi-structured interviews with ten senior pathologists. RESULTS Forty pathologists responded to the questionnaire, giving an 89% response rate. There were 42.5% of the respondents aged between 35-44 years old, and 52.5% were male. The quantitative results reveal that most of the respondents were satisfied with the quality of the telepathology system with a mean of 2.6025 (Standard Deviation (SD) = 0.47176), whereas they were dissatisfied with the quality of the information with a mean of 2.4100 (SD = 1.580) and the technical support services with a mean of 2.2750 (SD = 0.99535). In addition, there was disagreement on the benefits of telepathology in clinical practice among the pathologists with a mean of 2.4667 (SD = 0.77552). The qualitative results indicate that the lack of interest in and little experience with using the system were behind the general dissatisfaction of most of the respondents. All of the interviewees were satisfied with the performance of the telepathology system and considered it successful; however, the quality of the technical support services, including training workshops, was deemed deficient. CONCLUSION This study concluded that telepathology system in Kuwait is functioning well and has been successful in its implementation; however, pathologists are dissatisfied with it, mainly due to the deficient quality of the technical support services provided. In addition, the successful implementation of such advanced technologies requires careful steps to be taken on multiple levels: technical, organisational, and managerial. Recommendations were suggested.
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Affiliation(s)
- Ali Jasem Buabbas
- Department of Community Medicine and Behavioural Sciences, Faculty of Medicine, Kuwait University, Safat 13110, P.O. Box 24923, Jabriya, Kuwait.
| | - Tareq Mohammad
- Department of Pathology, Jaber Al Ahmad Al Sabah Hospital, Ministry of Health, South Surra, Kuwait
| | - Adel K Ayed
- Department of Surgery, Faculty of Medicine, Kuwait University, Jabriya, Kuwait
| | - Hawraa Mallah
- Department of Internal Medicine, Mubarak Al Kabeer Hospital, Ministry of Health, Jabriya, Kuwait
| | - Hamza Al-Shawaf
- Department of Health Informatics and Information Management, Allied Health Sciences, Kuwait University, Jabriya, Kuwait
| | - Abdulwahed Mohammed Khalfan
- Department of Computing and Information Systems, The Public Authority for Applied Education and Training, Ardhiya, Kuwait
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Biswas AC, Chowdhuri NH, Ahmed F, Milki F, Mohammad T, Rahman ASML. Huge Intramuscular Cavernous Hemangioma involving SCM, Trapezius and scalene anterior: A Case Report. Bangladesh J of Otorhinolaryngology 2020. [DOI: 10.3329/bjo.v23i2.45169] [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: 11/05/2022]
Abstract
Intramuscular hemangiomas are rare benign neoplasms accounting for <1% of all hemangiomas and <20% are found in head and neck area. The muscle most frequently involved is the masseter muscle and very few cases have been reported for the occurrence of these hemangioma in the Sternocleidomastoid, trapezius muscle and scalene anterior muscles. Here, we are presenting a case report of intramuscular hemangioma involving these muscles in a 10-years-old boy.
Bangladesh J Otorhinolaryngol; October 2017; 23(2): 203-207
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Biswas AC, Ahmed F, Milki FU, Mohammad T, Alam MM. Laryngotracheal Separation Following Blunt Neck Injury. Bangladesh J of Otorhinolaryngology 2020. [DOI: 10.3329/bjo.v22i2.45101] [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: 11/05/2022]
Abstract
Blunt laryngotracheal injuries are rare. The signs and symptoms of blunt laryngotracheal trauma are not always specific to the extent or type of injury. A high index of suspicion should exist in any injury that may be associated with airway trauma. We report a 30-years man who had progressive shortness of breath following blunt neck injury. He had massive emphysema whereby an emergency tracheostomy with multiple fasciotomy was performed. During emergency tracheostomy, it was noted that he had anterior cricotracheal separation which was communicated posteriorly by mucosa and trachealis muscle.
Bangladesh J Otorhinolaryngol; October 2016; 22(2): 114-118
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Affiliation(s)
- D. Cole
- Wayne State University School of Medicine Detroit Michigan U.S.A
| | - T. Mohammad
- Department of Dermatology Henry Ford Hospital Detroit Michigan U.S.A
| | - H. Lim
- Department of Dermatology Henry Ford Hospital Detroit Michigan U.S.A
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Affiliation(s)
- T. Mohammad
- Department of Physical Therapy for Musculoskeletal Disorders and Surgery, Faculty of Physical Therapy, Cairo University, Giza, Egypt
| | - A.R. Youssef
- Department of Physical Therapy for Musculoskeletal Disorders and Surgery, Faculty of Physical Therapy, Cairo University, Giza, Egypt
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Das DK, George SA, Mohammad T, John B, George SS, Behbehani AI. Papillary carcinoma in thyroglossal duct cyst: Diagnosis by fine-needle aspiration cytology and immunocytochemistry. Diagn Cytopathol 2018; 46:797-800. [DOI: 10.1002/dc.23968] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 04/24/2018] [Indexed: 11/05/2022]
Affiliation(s)
- Dilip K. Das
- Department of Pathology, Faculty of Medicine; Kuwait University; Safat Kuwait
- Cytology Unit; Mubarak Al-Kabeer Hospital; Jabriya Kuwait
| | | | - Tareq Mohammad
- Histopathology Unit; Mubarak Al-Kabeer Hospital; Jabriya Kuwait
| | - Bency John
- Department of Pathology, Faculty of Medicine; Kuwait University; Safat Kuwait
| | - Sara S. George
- Department of Pathology, Faculty of Medicine; Kuwait University; Safat Kuwait
| | - Abdulla I. Behbehani
- Department of Pathology, Faculty of Medicine; Kuwait University; Safat Kuwait
- Department of Surgery; Mubarak Al-Kabeer Hospital; Jabriya Kuwait
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Braunberger T, Nahhas A, Kohli I, Mohammad T, Nicholson C, Isedeh P, Al-Jamal M, Nartker N, Karaman-Jurukovska N, Matsui M, Lim H, Hamzavi I. 1279 An in vivo model for post-inflammatory hyperpigmentation. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.1295] [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: 11/15/2022]
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Ali RH, Taraboanta C, Mohammad T, Hayes MM, Ionescu DN. Metastatic non-small cell lung carcinoma a mimic of primary breast carcinoma-case series and literature review. Virchows Arch 2017; 472:771-777. [PMID: 29105026 DOI: 10.1007/s00428-017-2262-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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: 08/10/2017] [Revised: 10/09/2017] [Accepted: 10/26/2017] [Indexed: 12/22/2022]
Abstract
Metastatic tumors to the breast are rare but constitute a major diagnostic dilemma. Of these, non-mammary carcinomatous metastases to the breast are particularly challenging and, without a clinical history, may be extremely difficult to distinguish from primary breast carcinoma (PBC). We specifically studied metastatic tumors of pulmonary origin, as the lung is one of the major primary sites for carcinomatous metastasis to breast. Sixteen metastatic lung tumors to the breast were identified in our archives between 1996 and 2017 including 12 non-small cell lung carcinomas (NSCLC), one large-cell neuroendocrine, one atypical carcinoid, and two small-cell carcinomas. Adenocarcinoma was the most frequent amongst the NSCLCs (11/14). We retrieved the clinical information of these cases and reviewed the pathological characteristics to provide practical tools for pathologists to aid in their identification. Even in the absence of a clinical history of lung cancer, metastatic pulmonary adenocarcinoma to the breast should be considered in at least one of the following scenarios: (1) single or multiple well-circumscribed lesions of the breast that lack an in situ component and that are accompanied by distant metastases but negative axillary lymph nodes, (2) breast tumors that are triple negative yet not high-grade, or (3) breast tumors presenting as stage 4 disease and/or having an unusually aggressive clinical course on standard breast therapy. Accurate and timely diagnosis of these tumors is mandatory because of treatment and prognostic implications.
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Affiliation(s)
- Rola H Ali
- Pathology Department, Health Sciences Center, Kuwait University, Kuwait, Kuwait
| | - Catalin Taraboanta
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada
| | - Tareq Mohammad
- Department of Pathology, University of California, Los Angeles, CA, USA
| | - Malcolm M Hayes
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada.,Pathology Department, British Columbia Cancer Agency (BCCA), 600 W 10th Ave, Vancouver, BC, V5Z 4E6, Canada
| | - Diana N Ionescu
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada. .,Pathology Department, British Columbia Cancer Agency (BCCA), 600 W 10th Ave, Vancouver, BC, V5Z 4E6, Canada.
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Mohammad A, De Lucia Rolfe E, Sleigh A, Kivisild T, Behbehani K, Wareham NJ, Brage S, Mohammad T. Validity of visceral adiposity estimates from DXA against MRI in Kuwaiti men and women. Nutr Diabetes 2017; 7:e238. [PMID: 28067890 PMCID: PMC5301039 DOI: 10.1038/nutd.2016.38] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Revised: 05/12/2016] [Accepted: 07/20/2016] [Indexed: 01/17/2023] Open
Abstract
OBJECTIVES The prevalence of obesity and diabetes in the Middle East is among the highest in the world. Valid measures of abdominal adiposity are essential to understanding the metabolic consequences of obesity. Dual-energy X-ray absorptiometry (DXA) is increasingly being utilised to assess body composition in population studies, and has recently been used to estimate visceral adipose tissue (VAT). The aim of this study was to determine the accuracy of DXA-derived VAT in a Middle Eastern population using magnetic resonance imaging (MRI) as the criterion measure. METHOD VAT was estimated from abdominal DXA measures in 237 adult men (n=130) and women (n=107), aged 18-65 years, participating in the Kuwait Wellbeing Study. These estimates were compared with MRI measures of the corresponding anatomical region. The agreement between methods was assessed using Bland-Altman as well as correlation analysis. RESULTS Median MRI VAT was 1148.5 cm3 (95% confidence interval: 594.2-1734.6) in men and 711.3 cm3 (95% confidence interval: 395.5-1042.8) in women. DXA estimates of VAT showed high correlations with corresponding MRI measures (r=0.94 (P<0.0001) in men; r=0.93 (P<0.0001) in women). DXA overestimated VAT with a mean bias (95% limits of agreement) of 79.7 cm3 (-767 to 963) in men and 46.8 cm3 (-482 to 866) in women. The imprecision of DXA increased with increasing VAT level in both men and women. CONCLUSION DXA estimates of VAT are valid for use in Middle Eastern populations, although accuracy decreases with increasing level of visceral adiposity.
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Affiliation(s)
- A Mohammad
- Department of Public Health Research, Dasman Diabetes Institute, Kuwait City, Kuwait
| | - E De Lucia Rolfe
- Medical Research Council Epidemiology Unit, University of Cambridge School of Clinical Medicine, Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge, UK
| | - A Sleigh
- Wolfson Brain Imaging Centre, University of Cambridge School of Clinical Medicine, and NIHR/Wellcome Trust Clinical Research Facility, Cambridge University Hospitals NHS Foundation Trust, Cambridge Biomedical Campus, Cambridge, UK
| | - T Kivisild
- Department of Biological Anthropology, University of Cambridge, Cambridge, UK
| | - K Behbehani
- Department of Public Health Research, Dasman Diabetes Institute, Kuwait City, Kuwait
| | - N J Wareham
- Medical Research Council Epidemiology Unit, University of Cambridge School of Clinical Medicine, Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge, UK
| | - S Brage
- Medical Research Council Epidemiology Unit, University of Cambridge School of Clinical Medicine, Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge, UK
| | - T Mohammad
- Department of Biological Anthropology, University of Cambridge, Cambridge, UK
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Mohammad T, Farzad N, Tagie GM, Ranjbar K. The impact of rapid weight loss on the leptin, adiponectin levels, and insulinresistance among adult free style wrestlers. J Sports Med Phys Fitness 2015; 55:805-812. [PMID: 26360966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
AIM Recent studies, shows the effective role of adipose tissue as an active endocrine organ. Leptin level increases in obese bodies while adiponectin as an antirisk factor reduction that contributes to decrease insulin resistance and anthropometric profiles. Hence, expected to the negative effects of weight loss on wrestlers' physiological function; leptin and adiponectin behaviors and insulin resistance in young wrestlers during their rapid weight loss program were examined. METHODS Fifteen young (23±1 yr) freestyle wrestlers with (weight 67.6±0.8 kg, BMI 22.5±0.2 kg/m²) in two (60 and 66 kg) weight categories were selected randomly. Caloric intake and anthropometric characteristics measured by standard methods. The leptin and adiponectin hormones and insulin resistance index were measured by sandwich and HOMA-IR methods respectively. Wrestlers performed a week rapid weight loss Protocol (average of 4% of body weight loss) under the supervision of their coach. Eventually, selected factors were measured after 12 and 24 hours of recovery, again. RESULTS The rapid weight loss (4%) program had a significantly reduced impact on anthropometric factors; leptin level, insulin resistance, and increased beta cell function, while the changes of adiponectin were not significant after weight loss. CONCLUSION Findings of this study shows that dramatic decrease in anthropometric factors follow the weight loss program that having a significant decrease on leptin, L/A ratio and HOMA-IR, without significant changes in adiponectin levels. These changes may have harmful physiological effects on wrestlers' bodies but they can be useful to regulate of fatty acid, glucose metabolism, and insulin resistance.
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Affiliation(s)
- T Mohammad
- Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences,Bu-Ali Sina university Hamedan, Iran -
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Ezzat A, EI Tayeb Y, Mohammad T, Essam F, Hassanin A, Ahmad A, Sebastian M. Experienced Airway Management in Laryngotracheal Injuries: Series of Cases, Survey and Review of Literature. Qatar Med J 2010. [DOI: 10.5339/qmj.2010.1.16] [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] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Definitive airway control of penetrating laryngotracheal injury can be an extremely difficult challenge for the emergency physician. We report three serious cases of penetrating neck trauma with laryngeal injury that were managed successfully using different techniques of airway control in the Emergency Department (ED) of Hamad General Hospital during the three years from January 2006 through December 2008. Individualized assessment, identification of type of injury and familiarity with airway control techniques and the available options assure timely, safe and proper airway control in such injuries. Choice of technique in penetrating laryngotracheal injury is multifactorial and depends upon case presentation, physician preference, skill, and clinical constraints. The incidence of neck injury during this period was lower than in other reports; being 0.07 % of total trauma cases, while the incidence of penetrating neck injuries represented 17.6% of total neck injuries with no deaths. Implications Statement: Familiarity and availability of variant airway management techniques and variant surgical interventions in penetrating laryngotracheal injuries, improve outcome and reduce mortality.
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Affiliation(s)
| | | | | | | | | | - A. Ahmad
- ****Departments of Trauma Hamad Medical Corporation, Doha, Qatar
| | - M. Sebastian
- *Departments of Anesthesia
- **Departments of Emergency
- ***Departments of ORL-HNS
- ****Departments of Trauma Hamad Medical Corporation, Doha, Qatar
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Affiliation(s)
- T. Mohammad
- a College of Pharmacy , University of Saskatchewan , Saskatoon, Saskatchewan, S7N 0W0, CANADA
- b Department of Chemistry , Purdue University , West Lafayette, IN, 47907
| | - E. M. Hawes
- a College of Pharmacy , University of Saskatchewan , Saskatoon, Saskatchewan, S7N 0W0, CANADA
| | - K. K. Midha
- a College of Pharmacy , University of Saskatchewan , Saskatoon, Saskatchewan, S7N 0W0, CANADA
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Mohammad T, Amato RJ, Hernandez-McClain J, Messman R, Morgenstern D, Low P, Bevers S. Phase I trial of EC90 (keyhole-limpet hemocyanin fluorescein isothiocyanate conjugate) with GPI-0100 followed by EC 17 (folate- fluorescein isothiocyanate conjugate) in combination with interferon-alpha (ifnα) and interleukin-2 (IL-2) in patients with metastatic renal cell carcinoma (MRCC). J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.3081] [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: 11/20/2022] Open
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Mohammad T, Midha KK, Hawes EM. Synthesis of deuterium labelled thioridazine via ruthenium tetroxide oxidation of the piperidine ring. J Labelled Comp Radiopharm 2006. [DOI: 10.1002/jlcr.2580250408] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Mohammad T, Midha KK, Hawes EM. Synthesis of deuterium labelled analogues of S-oxidative metabolites of thioridazine. J Labelled Comp Radiopharm 2006. [DOI: 10.1002/jlcr.2580270208] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Mohammad T, Hawes EM, McKay G, Midha KK. An improved synthesis of dideuterated thioridazine with the label in the piperidine ring. J Labelled Comp Radiopharm 2006. [DOI: 10.1002/jlcr.2580280914] [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: 11/07/2022]
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Beissert S, Rühlemann D, Mohammad T, Grabbe S, El-Ghorr A, Norval M, Morrison H, Granstein RD, Schwarz T. IL-12 prevents the inhibitory effects of cis-urocanic acid on tumor antigen presentation by Langerhans cells: implications for photocarcinogenesis. J Immunol 2001; 167:6232-8. [PMID: 11714785 DOI: 10.4049/jimmunol.167.11.6232] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
UV radiation induces skin cancer primarily by its DNA-damaging properties, but also by its capacity to suppress the immune system. The photoisomer of urocanic acid (UCA), cis-UCA, is an important mediator of UV-induced immunosuppression and is involved in the inhibition of tumor immunity. The immunomodulatory cytokine IL-12 is known to counteract many of the immunosuppressive effects of UV radiation, including UV-induced immune tolerance. In this study, we addressed whether IL-12 also reverts the immunosuppressive activities of cis-UCA. Cis-UCA inhibits the ability of Langerhans cells to present tumor Ags for primary and secondary tumor immune responses. IL-12 treatment completely prevented the suppression by cis-UCA. IL-12 also protected mice from cis-UCA-induced suppression of contact hypersensitivity responses. To study the effects of cis-UCA on Ag-processing and Ag-presenting function in vitro, Langerhans cells were treated with UCA isomers and incubated with OVA or OVA peptide(323-339) before exposure to OVA-specific transgenic T cells. Cis-, but not trans-UCA suppressed Ag presentation, which was completely reversed upon addition of IL-12. Since these findings suggest that cis-UCA may play an important role in photocarcinogenesis by inhibiting a tumor immune response, mice were chronically UVB irradiated to induce skin cancer. Whereas all mice in the control groups developed tumors, mice treated with a mAb with specificity for cis-UCA showed a significantly reduced tumor incidence. These data strongly indicate the importance of cis-UCA during photocarcinogenesis and support the concept of counteracting cis-UCA as an alternative strategy to prevent UV-induced skin cancer, possibly via the application of IL-12.
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MESH Headings
- Animals
- Antigen Presentation/drug effects
- Antigen Presentation/immunology
- Antigens, Neoplasm/immunology
- Antigens, Neoplasm/metabolism
- Dermatitis, Contact/immunology
- Dermatitis, Contact/prevention & control
- Epitopes, T-Lymphocyte/immunology
- Female
- Immune Sera/administration & dosage
- Immunization, Passive
- Immunosuppressive Agents/antagonists & inhibitors
- Immunosuppressive Agents/pharmacology
- Injections, Intraperitoneal
- Interleukin-12/physiology
- Langerhans Cells/drug effects
- Langerhans Cells/immunology
- Langerhans Cells/metabolism
- Lymphocyte Activation/drug effects
- Mice
- Mice, Inbred A
- Mice, Inbred BALB C
- Mice, Transgenic
- Neoplasms, Radiation-Induced/immunology
- Skin Neoplasms/immunology
- Skin Neoplasms/prevention & control
- T-Lymphocytes/drug effects
- T-Lymphocytes/immunology
- Tumor Cells, Cultured
- Ultraviolet Rays
- Urocanic Acid/administration & dosage
- Urocanic Acid/antagonists & inhibitors
- Urocanic Acid/immunology
- Urocanic Acid/pharmacology
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Affiliation(s)
- S Beissert
- Department of Dermatology, University of Münster, Münster, Germany.
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23
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Abstract
Irradiation of the red-light absorbing dye, methylene blue (MB), in the presence of the metal complex, cis-Rh(phen)2Cl2+ (BISPHEN), leads to irreversible photobinding of both reagents to DNA. Evidence from absorption and emission spectroscopy indicates that the dye is strongly complexed to the DNA at the concentrations used in the experiments and that this complex is unaffected by the presence of BISPHEN. The level of covalent binding is proportional to the absorbed light dose, with the quantum efficiency for covalent binding of BISPHEN to the DNA with 633 nm light equal to 3.5 x 10(-4). Electrospray ionization mass spectrum of a mixture of DNA fragments created by enzymatic degradation of DNA isolated following irradiation indicates that purine adducts are formed with both BISPHEN and the dye. In addition, UV-Vis and high-performance liquid chromatography analyses of the irradiated MB/BISPHEN/DNA mixture and isolated adducts show extensive conversion of the dye and metal complex to the corresponding N-demethylated and aquated derivatives, respectively. Triplet quenchers for MB, for example oxygen and benzoquinone, inhibit both the photoconjugation and the photochemistry of BISPHEN. A mechanism for the synergistic interaction is proposed that involves photoconjugation of both partners to the DNA following oxidation and reduction via electron transfer between 1MB*/DNA and 3MB*/BISPHEN.
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Affiliation(s)
- T Mohammad
- Department of Chemistry, Purdue University, West Lafayette, IN 47907-1393, USA.
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24
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Abstract
Taylor's blue (1,9-dimethylmethylene blue, DMMB+) associates with DNA, at least in part, through intercalation as is evidenced from the red shift in the absorption maximum, diminution of the fluorescence, and induced circular dichroism in the presence of nucleic acid. Irradiation of DMMB+/covalently closed circular supercoiled phiX174 phage DNA complex at lambda > 520 nm leads to DNA nicking in a dose-dependent manner.
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Affiliation(s)
- T Mohammad
- Department of Chemistry, Purdue University, West Lafayette, IN 47907-1393, USA
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25
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Mohammad T, Chen C, Guo P, Morrison H. Photoinduced cross-linking of RNA by cis-Rh(phen)2Cl2+ and cis-Rh(phen)(phi)Cl2+: a new family of light activatable nucleic acid cross-linking agents. Bioorg Med Chem Lett 1999; 9:1703-8. [PMID: 10397505 DOI: 10.1016/s0960-894x(99)00265-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The metal complexes, cis-Rh(phen)2Cl2+ and its more hydrophobic analog cis-Rh(phen)(phi)Cl2+, have been shown to photocross-link the 120-base phi29-encoded pRNA. Primer extension on the cis-Rh(phen)(phi)Cl2(+)-photocross-linked RNA revealed that guanines are responsible for the interstrand cross-links.
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Affiliation(s)
- T Mohammad
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
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26
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Mohammad T, Morrison H, HogenEsch H. Urocanic acid photochemistry and photobiology. Photochem Photobiol 1999; 69:115-35. [PMID: 10048307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Affiliation(s)
- T Mohammad
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA.
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27
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Mohammad T, Morrison H. Simultaneous determination of methylene violet, halogenated methylene violet and their photoproducts in the presence of DNA by high-performance liquid chromatography using an internal surface reversed-phase column. J Chromatogr B Biomed Sci Appl 1997; 704:265-75. [PMID: 9518160 DOI: 10.1016/s0378-4347(97)00475-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A simple and rapid isocratic high-performance liquid chromatographic method for the analysis of methylene violet, a neutral phenothiazine dye, in the presence of DNA has been developed. These chromatographic conditions are also applicable to its N-demethylated, bromo and iodo analogs. The method utilizes an internal surface reversed-phase column and a mobile phase consisting of 20% acetonitrile in 50 mM phosphate buffer (pH 7.0) and detection at 280 nm. Under these conditions all five dyes are well resolved from one another and from the faster migrating DNA. The effects of organic modifiers, ionic strength and pH of the buffer on the capacity factors of the dyes have been investigated. The method has successfully been applied to detect the photoproducts of methylene violet and its bromo analog in the presence of DNA without removing the biopolymer from the reaction mixture.
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Affiliation(s)
- T Mohammad
- Department of Chemistry, Purdue University, West Lafayette, IN 47907-1393, USA
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28
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Abstract
The interaction of methylene violet (MV) and 4-bromomethylene violet (BrMV) with calf thymus and supercoiled phi X174 phage RF I DNA is reported. Measurements employing UV-visible absorption spectroscopy and equilibrium dialysis give evidence for the formation of complexes by each dye with DNA in the dark. They covalently bind to DNA, and MV nicks DNA, when the nucleic acid/dye mixtures are irradiated with visible light in a deoxygenated environment. Quantum efficiencies for singlet oxygen formation are 0.27 and 0.25 for MV and BrMV, respectively. A higher value (0.49) is observed for 4-iodomethylene violet (IMV).
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Affiliation(s)
- H Morrison
- Department of Chemistry, Purdue University, West Lafayette, IN 47907-1393, USA
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29
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Beissert S, Mohammad T, Torri H, Lonati A, Yan Z, Morrison H, Granstein RD. Regulation of tumor antigen presentation by urocanic acid. J Immunol 1997; 159:92-6. [PMID: 9200443] [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] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Urocanic acid (UCA) accumulates in the epidermis after deamination of histidine. UCA isomerizes from the trans to the cis form upon exposure to environmental UV radiation. Cis-UCA is immunosuppressive in several models. Topically applied cis-UCA was reported to enhance the cutaneous tumor yield in chronically UV-irradiated mice, suggesting involvement of cis-UCA in photocarcinogenesis. Since Langerhans cells (LC) are capable of presenting tumor-associated Ags (TAA) for primary and secondary tumor-immune responses, we examined the effects of trans- and cis-UCA on LC tumor Ag presentation in a model of immunity to the S1509a spindle cell tumor (H-2a). In this system, induction of immunity requires exposure of LC to granulocyte-macrophage CSF. Naive CAF1 (H-2(a/d)) mice were immunized against S1509a by injection with granulocyte-macrophage CSF-exposed and TAA-pulsed epidermal cells (EC), as assessed by growth inhibition of inoculated tumor cells. Incubation of EC in cis-, but not trans-UCA completely inhibited Ag presentation in this system. Neither histamine antagonists nor indomethacin reversed these effects of cis-UCA. The ability of trans- and cis-UCA to modulate EC presentation of TAA for secondary immune responses was also examined. EC were pulsed with TAA in vitro and then injected into hind footpads of tumor-immune mice. After 24 h, footpad swelling was assessed as a measure of delayed-type hypersensitivity. Incubation with cis-, but again not trans-UCA before TAA exposure significantly inhibited elicitation of delayed-type hypersensitivity. These data indicate that cis-UCA may be an important regulator of LC Ag-presenting function in tumor-immune responses, and thus may play a role in photocarcinogenesis.
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Affiliation(s)
- S Beissert
- MGH/Harvard Cutaneous Biology Research Center, Department of Dermatology, Massachusetts General Hospital-East and Harvard Medical School, Charlestown 02129, USA.
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30
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Beissert S, Mohammad T, Torri H, Lonati A, Yan Z, Morrison H, Granstein RD. Regulation of tumor antigen presentation by urocanic acid. The Journal of Immunology 1997. [DOI: 10.4049/jimmunol.159.1.92] [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] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
Urocanic acid (UCA) accumulates in the epidermis after deamination of histidine. UCA isomerizes from the trans to the cis form upon exposure to environmental UV radiation. Cis-UCA is immunosuppressive in several models. Topically applied cis-UCA was reported to enhance the cutaneous tumor yield in chronically UV-irradiated mice, suggesting involvement of cis-UCA in photocarcinogenesis. Since Langerhans cells (LC) are capable of presenting tumor-associated Ags (TAA) for primary and secondary tumor-immune responses, we examined the effects of trans- and cis-UCA on LC tumor Ag presentation in a model of immunity to the S1509a spindle cell tumor (H-2a). In this system, induction of immunity requires exposure of LC to granulocyte-macrophage CSF. Naive CAF1 (H-2(a/d)) mice were immunized against S1509a by injection with granulocyte-macrophage CSF-exposed and TAA-pulsed epidermal cells (EC), as assessed by growth inhibition of inoculated tumor cells. Incubation of EC in cis-, but not trans-UCA completely inhibited Ag presentation in this system. Neither histamine antagonists nor indomethacin reversed these effects of cis-UCA. The ability of trans- and cis-UCA to modulate EC presentation of TAA for secondary immune responses was also examined. EC were pulsed with TAA in vitro and then injected into hind footpads of tumor-immune mice. After 24 h, footpad swelling was assessed as a measure of delayed-type hypersensitivity. Incubation with cis-, but again not trans-UCA before TAA exposure significantly inhibited elicitation of delayed-type hypersensitivity. These data indicate that cis-UCA may be an important regulator of LC Ag-presenting function in tumor-immune responses, and thus may play a role in photocarcinogenesis.
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Affiliation(s)
- S Beissert
- MGH/Harvard Cutaneous Biology Research Center, Department of Dermatology, Massachusetts General Hospital-East and Harvard Medical School, Charlestown 02129, USA.
| | - T Mohammad
- MGH/Harvard Cutaneous Biology Research Center, Department of Dermatology, Massachusetts General Hospital-East and Harvard Medical School, Charlestown 02129, USA.
| | - H Torri
- MGH/Harvard Cutaneous Biology Research Center, Department of Dermatology, Massachusetts General Hospital-East and Harvard Medical School, Charlestown 02129, USA.
| | - A Lonati
- MGH/Harvard Cutaneous Biology Research Center, Department of Dermatology, Massachusetts General Hospital-East and Harvard Medical School, Charlestown 02129, USA.
| | - Z Yan
- MGH/Harvard Cutaneous Biology Research Center, Department of Dermatology, Massachusetts General Hospital-East and Harvard Medical School, Charlestown 02129, USA.
| | - H Morrison
- MGH/Harvard Cutaneous Biology Research Center, Department of Dermatology, Massachusetts General Hospital-East and Harvard Medical School, Charlestown 02129, USA.
| | - R D Granstein
- MGH/Harvard Cutaneous Biology Research Center, Department of Dermatology, Massachusetts General Hospital-East and Harvard Medical School, Charlestown 02129, USA.
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31
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Mohammad T, Tessman I, Morrison H, Kennedy MA, Simmonds SW. Photosensitized inactivation of infectious DNA by urocanic acid, indoleacrylic acid and rhodium complexes. Photochem Photobiol 1994; 59:189-96. [PMID: 8165239 DOI: 10.1111/j.1751-1097.1994.tb05021.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Naked, infectious single-stranded (ss) and double-stranded (ds) DNA from phages S13 and G4 were irradiated with 308 nm UV radiation in the absence and presence of several photobiologically active compounds: E- and Z-urocanic acid (E- and Z-UA), their methyl esters (E- and Z-MU), E- and Z-indoleacrylic acid (E- and Z-IA), cis-dichloro-bis(1,10-phenanthroline)rhodium(III) chloride (cDCBPR) and tris(1,10-phenanthroline)rhodium (III) perchlorate (TPR). E-urocanic acid protects against cyclobutane pyrimidine dimer formation in ssDNA but concomitantly photosensitizes the formation of other lesions that inactivate ssDNA. Z-urocanic acid also protects ssDNA against such dimerization but without the associated sensitized damage. The methyl ester isomers behave similarly. There is no such differential activity observed for the IA isomers, both of which sensitize the inactivation of ssDNA. Photostationary state mixtures of both UA and IA efficiently sensitize the inactivation of dsDNA, and cDCBPR strongly protects ssDNA from UV damage, while TPR is a significant sensitizer. Both of these metal complexes sensitize the inactivation of dsDNA slightly. For all compounds, cyclobutane pyrimidine dimers were the predominant lethal lesions produced by sensitization of the dsDNA, but they were not the major lethal lesions created by sensitization of the ssDNA. In the case of dsDNA, both UA and IA created pyrimidine dimers with a high degree of potential for mutagenesis, as determined by an assay that monitors the frequency of mutations following the spontaneous deamination of cytosine in photodimers.
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Affiliation(s)
- T Mohammad
- Department of Chemistry, Purdue University, West Lafayette, IN 47907
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32
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Mohammad T, Morrison H. Rapid analysis of small molecules in the presence of DNA by high-performance liquid chromatography using internal surface reversed-phase silica. J Chromatogr 1990; 533:195-200. [PMID: 1964462 DOI: 10.1016/s0378-4347(00)82202-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- T Mohammad
- Department of Chemistry, Purdue University, West Lafayette, IN 47907
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33
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Abstract
E-beta-Indol-3-ylacrylic acid (IA), radiolabelled at the 2 position with 14C, and calf thymus DNA have been irradiated with UV light (lambda greater than 280 nm) in phosphate buffer (pH 7.0). Re-isolation of the DNA indicates covalent binding of IA at levels of up to 295 nmol IA/mg native DNA (0.097 IA/base). Binding is observed for both native and heat denatured DNA, but is more efficient with the latter. Quantum efficiencies of 2.60 X 10(-5) and 2.30 X 10(-4) mol IA bound to native DNA/mol photon absorbed have been measured at 308 and 266 nm, respectively. Studies with the four polyribonucleotides indicate a strong preference for binding to poly[U]. Photolysis of either untreated or enzymatically degraded labeled native DNA with 254 nm light leads to the reformation of IA, and a 2 + 2 photocycloadduct of IA and thymidine has been isolated and characterized and matched by HPLC to a DNA derived adduct. Equilibrium dialysis studies provide no evidence for preassociation of IA to DNA.
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Affiliation(s)
- S J Farrow
- Department of Chemistry, Purdue University, West Lafayette, IN 47907
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34
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Abstract
Photolysis of E-[ring-2-14C]urocanic acid (UA) with native or denatured calf thymus DNA leads to covalent binding of the radiolabel to the nucleic acid. A similar observation is made upon photolysis of the labeled UA with the polyribonucleotides, in which case a strong preference is observed for binding to poly[U]. DNA or poly[U], which had been reacted with UA and purified by dialysis and multiple precipitations, releases UA upon further irradiation with 254 nm light (as expected for cyclobutane adducts). Quantum efficiencies for binding of the UA to native DNA have been measured at 308 and 266 nm and are 0.30 x 10(-5) and 1.3 x 10(-4), respectively, at comparable reactant concentrations. The large increase at the shorter wavelength (where DNA absorption is more competitive) is taken as evidence for the primary role of a DNA excited state in initiating the binding reaction(s).
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Affiliation(s)
- S J Farrow
- Department of Chemistry, Purdue University, West Lafayette, IN 47907
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35
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Ahmad QR, Kamran MA, Mohammad T. Mineral constituents of health significance of Hazara water supplies. J PAK MED ASSOC 1988; 38:100-5. [PMID: 3138458] [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: 01/04/2023]
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36
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Daud S, Mohammad T, Ahmad A. A new method of grading tetanus neonatorum. J PAK MED ASSOC 1982; 32:41-5. [PMID: 6803003] [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: 01/21/2023]
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Daud S, Mohammad T, Ahmad A. Tetanus neonatorum. (A preliminary report on the assessment of different therapeutic regimens). J PAK MED ASSOC 1981; 31:105-8. [PMID: 6788980] [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: 01/21/2023]
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39
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Mohammad T. Fanconi familial hypoplastic anaemia. J PAK MED ASSOC 1981; 31:88-9. [PMID: 6785500] [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: 01/21/2023]
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