1
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Salerni G, Peralta R, Bertaina C, Gorosito M, Fernández-Bussy R. Dermoscopy of idiopathic facial aseptic granuloma. Clin Exp Dermatol 2020; 45:605-606. [PMID: 31919863 DOI: 10.1111/ced.14174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/07/2020] [Indexed: 01/17/2023]
Affiliation(s)
- G Salerni
- Dermatology Department, Hospital Provincial del Centenario de Rosario, Universidad Nacional de Rosario, Rosario, Argentina.,Diagnóstico Médico Oroño, Rosario, Argentina
| | - R Peralta
- Dermatology Department, School of Medicine, Instituto de Investigaciones Médicas 'A. Lanari', University of Buenos Aires, Argentina
| | - C Bertaina
- Dermatology Department, Hospital Provincial del Centenario de Rosario, Universidad Nacional de Rosario, Rosario, Argentina
| | - M Gorosito
- Pathology Department, Universidad Nacional de Rosario, Argentina
| | - R Fernández-Bussy
- Dermatology Department, Hospital Provincial del Centenario de Rosario, Universidad Nacional de Rosario, Rosario, Argentina
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Northridge ME, Shedlin M, Schrimshaw EW, Estrada I, De La Cruz L, Peralta R, Birdsall S, Metcalf SS, Chakraborty B, Kunzel C. Recruitment of racial/ethnic minority older adults through community sites for focus group discussions. BMC Public Health 2017; 17:563. [PMID: 28599637 PMCID: PMC5466755 DOI: 10.1186/s12889-017-4482-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [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: 03/01/2017] [Accepted: 06/01/2017] [Indexed: 11/11/2022] Open
Abstract
Background Despite a body of evidence on racial/ethnic minority enrollment and retention in research, literature specifically focused on recruiting racially/ethnically diverse older adults for social science studies is limited. There is a need for more rigorous research on methodological issues and the efficacy of recruitment methods. Cultural obstacles to recruitment of racial/ethnic minority older adults include language barriers, lack of cultural sensitivity of target communities on the part of researchers, and culturally inappropriate assessment tools. Methods Guided by the Consolidated Framework for Implementation Research (CFIR), this study critically appraised the recruitment of racial/ethnic minority older adults for focus groups. The initial approach involved using the physical and social infrastructure of the ElderSmile network, a community-based initiative to promote oral and general health and conduct health screenings in places where older adults gather, to recruit racial/ethnic minority adults for a social science component of an interdisciplinary initiative. The process involved planning a recruitment strategy, engaging the individuals involved in its implementation (opinion leaders in senior centers, program staff as implementation leaders, senior community-based colleagues as champions, and motivated center directors as change agents), executing the recruitment plan, and reflecting on the process of implementation. Results While the recruitment phase of the study was delayed by 6 months to allow for ongoing recruitment and filling of focus group slots, the flexibility of the recruitment plan, the expertise of the research team members, the perseverance of the recruitment staff, and the cultivation of change agents ultimately resulted in meeting the study targets for enrollment in terms of both numbers of focus group discussions (n = 24) and numbers of participants (n = 194). Conclusions This study adds to the literature in two important ways. First, we leveraged the social and physical infrastructure of an existing program to recruit participants through community sites where older adults gather. Second, we used the CFIR to guide the appraisal of the recruitment process, which underscored important considerations for both reaching and engaging this underserved population. This was especially true in terms of understanding the disparate roles of the individuals involved in implementing and facilitating the recruitment plan.
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Affiliation(s)
- Mary E Northridge
- Department of Epidemiology & Health Promotion, New York University College of Dentistry, 433 First Avenue, 7th Floor, Room 726, New York, NY, 10010, USA. .,Department of Sociomedical Sciences, Columbia University Mailman School of Public Health, New York, NY, USA. .,Columbia University College of Dental Medicine, Section of Population Oral Health, New York, NY, USA. .,Department of Geography, The State University of New York at Buffalo, Buffalo, NY, USA.
| | - Michele Shedlin
- New York University Rory Meyers College of Nursing, New York, NY, USA
| | - Eric W Schrimshaw
- Department of Sociomedical Sciences, Columbia University Mailman School of Public Health, New York, NY, USA
| | - Ivette Estrada
- Department of Sociomedical Sciences, Columbia University Mailman School of Public Health, New York, NY, USA.,Columbia University College of Dental Medicine, Section of Population Oral Health, New York, NY, USA
| | - Leydis De La Cruz
- Columbia University College of Dental Medicine, Section of Population Oral Health, New York, NY, USA
| | - Rogelina Peralta
- Columbia University College of Dental Medicine, Section of Population Oral Health, New York, NY, USA
| | - Stacia Birdsall
- New York University Rory Meyers College of Nursing, New York, NY, USA
| | - Sara S Metcalf
- Department of Geography, The State University of New York at Buffalo, Buffalo, NY, USA
| | - Bibhas Chakraborty
- Duke-National University of Singapore (Duke-NUS) Medical School, Centre for Quantitative Medicine, Singapore, Singapore
| | - Carol Kunzel
- Department of Sociomedical Sciences, Columbia University Mailman School of Public Health, New York, NY, USA.,Columbia University College of Dental Medicine, Section of Population Oral Health, New York, NY, USA
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3
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El-Menyar A, Asim M, Zarour A, Abdelrahman H, Peralta R, Parchani A, Al-Thani H. Trauma research in Qatar: a literature review and discussion of progress after establishment of a trauma research centre. East Mediterr Health J 2016; 21:811-8. [PMID: 26857718 DOI: 10.26719/2015.21.11.811] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 06/28/2015] [Indexed: 11/09/2022]
Abstract
A structured research programme is one of the main pillars of a trauma care system. Despite the high rate of injury-related mortalities, especially road traffic accidents, in Qatar, little consideration has been given to research in trauma. This review aimed to analyse research publications on the subject of trauma published from Qatar and to discuss the progress of clinical research in Qatar and the Gulf Cooperation Council countries with special emphasis on trauma research. A literature search using PubMed and Google Scholar search engines located 757 English-language articles within the fields of internal medicine, surgery and trauma originating from Qatar between the years 1993 and 2013. A steep increase in the number of trauma publications since 2010 could be linked to the setting up of a trauma research centre in Qatar in 2011. We believe that establishing a research unit has made a major impact on research productivity, which ultimately benefits health care.
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Affiliation(s)
- A El-Menyar
- Department of Surgery, Clinical Research, Hamad General Hospital, Hamad Medical Corporation, Doha, Qatar; Department of Clinical Medicine, Weill Cornell Medical College, Doha, Qatar; Department of Internal Medicine, Ahmed Maher Teaching Hospital, Cairo, Egypt
| | - M Asim
- Department of Surgery, Clinical Research, Hamad General Hospital, Hamad Medical Corporation, Doha, Qatar
| | - A Zarour
- Trauma Surgery Section, Clinical Research, Hamad General Hospital, Hamad Medical Corporation, Doha, Qatar
| | - H Abdelrahman
- Trauma Surgery Section, Clinical Research, Hamad General Hospital, Hamad Medical Corporation, Doha, Qatar
| | - R Peralta
- Trauma Surgery Section, Clinical Research, Hamad General Hospital, Hamad Medical Corporation, Doha, Qatar
| | - A Parchani
- Trauma Surgery Section, Clinical Research, Hamad General Hospital, Hamad Medical Corporation, Doha, Qatar
| | - H Al-Thani
- Trauma Surgery Section, Clinical Research, Hamad General Hospital, Hamad Medical Corporation, Doha, Qatar
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4
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El-Hennawy H, El-Menyar A, Al-Thani H, Tuma M, Parchani A, Abdulrahman H, Peralta R, Asim M, Zarour A, Latifi R. Epidemiology, causes and prevention of car rollover crashes with ejection. Ann Med Health Sci Res 2014; 4:495-502. [PMID: 25221693 PMCID: PMC4160669 DOI: 10.4103/2141-9248.139279] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [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] [Indexed: 11/12/2022] Open
Abstract
Rollover crashes (ROCs) are responsible for almost a third of all highway vehicle occupant fatalities. Although ROCs are common and serious mechanism of injury, ROCs are under-reported. To analyze the causes, mechanism, impact and prevention of ROCs, we reviewed the literature between 1984 and 2013. By utilizing the search engines PubMed, MEDLINE and EMBASE by using key words “ROCs” “Ejection” and “vehicle” the initial search yielded 241 abstracts, of which 58 articles were relevant. Most of the articles were either retrospective or experimental studies funded by automobile companies. All vehicles are susceptible to rollovers to certain extents. Despite continuing innovation in vehicles’ safety, human factor is pivotal in prevention of ROCs. Distracted driving, speeding and drinking escalate the chances of rollover crashes. Wearing a seatbelt greatly improves the chances of surviving a ROC.
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Affiliation(s)
- Hm El-Hennawy
- Department of Surgery, Trauma Surgery Section, Hamad General Hospital, Doha, Qatar
| | - A El-Menyar
- Clinical Research, Trauma Surgery, Hamad General Hospital, Doha, Qatar ; Clinical Medicine, Weill Cornell Medical College, Doha, Qatar
| | - H Al-Thani
- Department of Surgery, Trauma Surgery Section, Hamad General Hospital, Doha, Qatar
| | - M Tuma
- Department of Surgery, Trauma Surgery Section, Hamad General Hospital, Doha, Qatar
| | - A Parchani
- Department of Surgery, Trauma Surgery Section, Hamad General Hospital, Doha, Qatar
| | - H Abdulrahman
- Department of Surgery, Trauma Surgery Section, Hamad General Hospital, Doha, Qatar
| | - R Peralta
- Department of Surgery, Trauma Surgery Section, Hamad General Hospital, Doha, Qatar
| | - M Asim
- Clinical Medicine, Weill Cornell Medical College, Doha, Qatar
| | - A Zarour
- Department of Surgery, Trauma Surgery Section, Hamad General Hospital, Doha, Qatar
| | - R Latifi
- Department of Surgery, Trauma Surgery Section, Hamad General Hospital, Doha, Qatar ; Department of Surgery, Arizona University, Tucson, AZ, USA
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5
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Ordax E, Terán-Santos J, Alonso M, Coma M, Peralta R. OSA and oxidative stress: Preliminary analysis. Sleep Med 2013. [DOI: 10.1016/j.sleep.2013.11.692] [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: 11/16/2022]
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6
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Teodoro T, Geraldes R, Batista P, Pimentel J, Albuquerque L, Peralta R. Giant cell arteritis and varicella zoster infection: Concomitant causes of temporal headache. J Neurol Sci 2013. [DOI: 10.1016/j.jns.2013.07.1746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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7
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Parchani A, Peralta R, El-Menyar A, Tuma M, Zarour A, Kumar S, Abdulrahman H, AbdulRahman Y, Al-Thani H, Latifi R. Percutaneous dilatational tracheostomies in a newly established trauma center: a report from Qatar. Eur J Trauma Emerg Surg 2013; 39:507-10. [PMID: 26815448 DOI: 10.1007/s00068-013-0299-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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Accepted: 05/19/2013] [Indexed: 11/28/2022]
Abstract
BACKGROUND Percutaneous dilatational tracheostomy (PDT) is a routine surgical procedure for critically ill patients who require prolonged ventilatory support. METHODS We conducted a retrospective cohort study of all PDTs performed at the adult Trauma Intensive Care Unit (TICU) of Hamad Medical Corporation in Doha, Qatar, from January 2009 through September 2012. For all adult patients, we analyzed the demographic characteristics, mean ventilator time before the procedure, injury severity score (ISS), complications, and outcomes. RESULTS Of the 1,442 trauma patients admitted to the adult TICU during our study period, 124 (8.5 %) underwent PDT using the Ciaglia Blue Rhino technique. The vast majority were male (94.3 %). The mean age was 35 ± 15.6 years; mean ventilator time before the procedure, 12 ± 3 days; and mean ISS, 24.2 ± 9.3. More than half of patients had head injury (56 %), followed by chest and abdomen (26 %) and cervical spine injuries (18 %). Early complications included difficult tube placement (0.8 %), hypoxemia (0.8 %), minor bleeding (1.6 %), and hypotension (0.8 %), but the vast majority (93 %) of patients had no complications. The procedure-related mortality rate was 0 %. CONCLUSION PDT is safe and can be performed with minimal complications even in a newly established trauma center.
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Affiliation(s)
- A Parchani
- Section of Trauma Surgery, Department of Surgery, Hamad General Hospital, Doha, Qatar
| | - R Peralta
- Section of Trauma Surgery, Department of Surgery, Hamad General Hospital, Doha, Qatar
| | - A El-Menyar
- Weill Cornell Medical College, Doha, Qatar.,Clinical Research, Section of Trauma Surgery, Hamad General Hospital, Doha, Qatar
| | - M Tuma
- Section of Trauma Surgery, Department of Surgery, Hamad General Hospital, Doha, Qatar
| | - A Zarour
- Section of Trauma Surgery, Department of Surgery, Hamad General Hospital, Doha, Qatar
| | - S Kumar
- Section of Trauma Surgery, Department of Surgery, Hamad General Hospital, Doha, Qatar
| | - H Abdulrahman
- Section of Trauma Surgery, Department of Surgery, Hamad General Hospital, Doha, Qatar
| | - Y AbdulRahman
- Section of Trauma Surgery, Department of Surgery, Hamad General Hospital, Doha, Qatar
| | - H Al-Thani
- Section of Trauma Surgery, Department of Surgery, Hamad General Hospital, Doha, Qatar
| | - R Latifi
- Section of Trauma Surgery, Department of Surgery, Hamad General Hospital, Doha, Qatar. .,Weill Cornell Medical College, Doha, Qatar. .,Department of Surgery, University of Arizona, Tucson, AZ, USA.
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8
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Cordeiro I, Silva C, Peralta R, Bentes C. Negative myoclonus of epileptic origin in association with bilateral subdural hematoma. J Neurol Sci 2013. [DOI: 10.1016/j.jns.2013.07.176] [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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9
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El-Menyar A, Latifi R, AbdulRahman H, Zarour A, Tuma M, Parchani A, Peralta R, Al Thani H. Age and traumatic chest injury: a 3-year observational study. Eur J Trauma Emerg Surg 2013; 39:397-403. [DOI: 10.1007/s00068-013-0281-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 03/18/2013] [Indexed: 10/27/2022]
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10
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Enninghorst N, Peralta R, Yoshino O, Pfeifer R, Pape HC, Hardy BM, Dewar DC, Balogh ZJ. Physiological assessment of the polytrauma patient: initial and secondary surgeries. Eur J Trauma Emerg Surg 2011; 37:559-66. [DOI: 10.1007/s00068-011-0161-y] [Citation(s) in RCA: 5] [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] [Received: 07/16/2011] [Accepted: 10/15/2011] [Indexed: 10/16/2022]
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11
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Bruey J, Kantarjian H, Ma W, Yeh C, Peralta R, Lee T, O'Brien S, Estrov Z, Cortes J, Albitar M. Alternatively spliced truncated BCR-ABL1 protein in CML patients with resistance to kinase inhibitors. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.7026] [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: 11/20/2022] Open
Abstract
7026 Background: We have reported that some patients with imatinib-resistant chronic myeloid leukemia (CML) express an alternatively spliced BCR-ABL mRNA with a 35-bp insertion (BCR-ABL135INS), resulting in the addition of 10 residues and truncation of 653 residues. Molecular dynamic simulation suggested that this truncation and insertion of new 10 AA results in structural changes similar to those seen in BCR-ABL with T315I mutation. Here we evaluate the prevalence of BCR-ABL135INS in imatinib-resistant CML, examine the effect of this mutation on resistance to compared the efficiency of various kinase inhibitors in vitro, and suggest a model for persistent CML and a possible strategy to eradicate residual disease. Methods: Using a sensitive PCR method, we determined the prevalence of the alternatively spliced BCR-ABL135INS mRNA in 288 patients with chronic-phase CML resistant to imatinib. Expression of truncated protein was confirmed by Western blot. We then tested the effectiveness of various kinase inhibitors on human K562 CML cells expressing different levels of BCR-ABL135INS along with wild-type BCR-ABL1. Results: BCR-ABL135INS mRNA was detected in 210 (73%) of the 288 patients. Only 25% of BCR-ABL135INS positive cases showed coexistance of ABL1 kinase point mutation. Immunoprecipitation studies demonstrated that expression of the predicted 143-kD BCR-ABL135INS protein at levels proportional to those predicted by mRNA. Expression of BCR-ABL135INS in K562 cells was sufficient to conferred resistance to imatinib, dasatinib, and nilotinib in a dose-dependant fashion. However, no resistance was detected using aurora kinase inhibitor (MK 0457) or homoharringtonine (HHT). BCR-ABL135INS suppressed imatinib, nilotinib, and dasatinib-mediated dephosphorylation of CRKL, LYN, SRC, and STAT5, but had no effect on MK 0457-mediated dephosphorylation. The combination of imatinib with nilotinib or HHT showed strong synergy, overcoming BCR-ABL135INS-induced resistance in vitro. Conclusions: These findings emphasize the importance of the overlooked alternatively spliced BCR-ABL135INS protein and may provide a strategy to treat resistant disease and eradicate residual CML. No significant financial relationships to disclose.
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Affiliation(s)
- J. Bruey
- Quest Diagnostics INC, San Juan Capistrano, CA; University of Texas M. D. Anderson Cancer Center, Houston, TX; Consortium for Bioinformatics, Minneapolis, MN
| | - H. Kantarjian
- Quest Diagnostics INC, San Juan Capistrano, CA; University of Texas M. D. Anderson Cancer Center, Houston, TX; Consortium for Bioinformatics, Minneapolis, MN
| | - W. Ma
- Quest Diagnostics INC, San Juan Capistrano, CA; University of Texas M. D. Anderson Cancer Center, Houston, TX; Consortium for Bioinformatics, Minneapolis, MN
| | - C. Yeh
- Quest Diagnostics INC, San Juan Capistrano, CA; University of Texas M. D. Anderson Cancer Center, Houston, TX; Consortium for Bioinformatics, Minneapolis, MN
| | - R. Peralta
- Quest Diagnostics INC, San Juan Capistrano, CA; University of Texas M. D. Anderson Cancer Center, Houston, TX; Consortium for Bioinformatics, Minneapolis, MN
| | - T. Lee
- Quest Diagnostics INC, San Juan Capistrano, CA; University of Texas M. D. Anderson Cancer Center, Houston, TX; Consortium for Bioinformatics, Minneapolis, MN
| | - S. O'Brien
- Quest Diagnostics INC, San Juan Capistrano, CA; University of Texas M. D. Anderson Cancer Center, Houston, TX; Consortium for Bioinformatics, Minneapolis, MN
| | - Z. Estrov
- Quest Diagnostics INC, San Juan Capistrano, CA; University of Texas M. D. Anderson Cancer Center, Houston, TX; Consortium for Bioinformatics, Minneapolis, MN
| | - J. Cortes
- Quest Diagnostics INC, San Juan Capistrano, CA; University of Texas M. D. Anderson Cancer Center, Houston, TX; Consortium for Bioinformatics, Minneapolis, MN
| | - M. Albitar
- Quest Diagnostics INC, San Juan Capistrano, CA; University of Texas M. D. Anderson Cancer Center, Houston, TX; Consortium for Bioinformatics, Minneapolis, MN
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Ferro JM, Canhão P, Peralta R. Update on subarachnoid haemorrhage. J Neurol 2008; 255:465-79. [DOI: 10.1007/s00415-008-0606-3] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2007] [Revised: 02/12/2007] [Accepted: 03/06/2007] [Indexed: 11/29/2022]
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13
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Lock L, Khine A, Huesca M, Lawson V, Peralta R, Cammisa E, Wang M, Jin H, Lee Y, Wright J, Young A. A novel zinc-chelating small molecule exhibits cancer cell growth inhibition in vitro and in vivo by induction of tumor suppressors early growth response 1 (Egr-1) and Krüppel-Like Factor 4 (KLF4). J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.14084] [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: 11/20/2022] Open
Abstract
14084 Background: Lead compound LT-253 was selected from a group of 2-indolyl imidazol [4,5-d] phenanthroline derivatives with anticancer activity. It shows potent and selective anti-proliferative activity against several human cancer types in vitro, and in vivo in xenograft mouse models of human colon carcinoma (HT-29) and non-small cell lung carcinoma (H460). Methods: The mechanism of cell growth inhibition of LT-253 was investigated in HT-29 colon cancer cells using the XTT cell proliferation assay, flow cytometry and apoptosis assays. In vitro and in vivo zinc chelation was determined by competition assays using fluorescent and chromophoric chelators. Gene expression studies were performed by human genome microarray analysis and confirmed by quantitative real- time PCR. The transcription factor activity profile of LT-253-treated cells was determined by a multiplex transcription factor array and electrophoretic mobility shift assays. The functional role of specific genes was evaluated by siRNA gene knock-down. Results: LT-253 functions as chelator of zinc in vitro, and of intracellular labile zinc in HT-29 cells. Moreover, LT-253-mediated HT-29 cell growth inhibition was reversed by zinc supplementation. Gene expression profiling confirmed sustained changes in zinc-sensitive genes such as metallothionine and several zinc transporters, but not copper-sensitive or iron-sensitive genes. LT-253 induces cancer cell growth inhibition primarily through G1/S phase cell cycle arrest. Gene expression and transcription factor activities of both Egr-1 and KLF4 are induced within 4 hr post LT-253 treatment. Moreover, increased expression of both Egr-1 and KLF4 is observed in LT-253-sensitive cancer cell lines of various origins. Importantly, Egr-1 and KLF4 gene knock-down by siRNA reversed the LT-253-mediated cell growth inhibition of HT-29 cells. Conclusion: Selective chelation of intracellular labile zinc pool by LT-253 triggers immediate induction of stress-responsive tumor suppressor Egr-1 and sustained induction of zinc-responsive tumor suppressor KLF4, leading to G1/S phase cell cycle arrest and inhibition of tumor growth. No significant financial relationships to disclose.
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Affiliation(s)
- L. Lock
- Lorus Therapeutics Inc., Toronto, ON, Canada
| | - A. Khine
- Lorus Therapeutics Inc., Toronto, ON, Canada
| | - M. Huesca
- Lorus Therapeutics Inc., Toronto, ON, Canada
| | - V. Lawson
- Lorus Therapeutics Inc., Toronto, ON, Canada
| | - R. Peralta
- Lorus Therapeutics Inc., Toronto, ON, Canada
| | - E. Cammisa
- Lorus Therapeutics Inc., Toronto, ON, Canada
| | - M. Wang
- Lorus Therapeutics Inc., Toronto, ON, Canada
| | - H. Jin
- Lorus Therapeutics Inc., Toronto, ON, Canada
| | - Y. Lee
- Lorus Therapeutics Inc., Toronto, ON, Canada
| | - J. Wright
- Lorus Therapeutics Inc., Toronto, ON, Canada
| | - A. Young
- Lorus Therapeutics Inc., Toronto, ON, Canada
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14
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Affiliation(s)
- R Peralta
- Department of Surgery, Massachusetts General Hospital, Boston, MA 02114, USA
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15
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Oliva JP, Pimentel G, Borrón M, Peralta R, Ortiz R, Oliver B, Díaz N, Sánchez I, Vázquez AM, Baum RP. [Pilot study with the monoclonal antibody IOR-C5 as a potential agent of radioimmunoscintigraphy in colorectal cancer]. Rev Esp Med Nucl 2001; 20:282-8. [PMID: 11940415 DOI: 10.1016/s0212-6982(01)71959-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
UNLABELLED IOR C-5 is a G1 immunoglobulin type intact murine monoclonal antibody (MAb) that was developed in the Center of Molecular Immunology in Havana City, Cuba. In immunohistochemical studies, this demonstrated a significant affinity for the epithelial tissues so that it was used in a pilot clinical study to perform a radioimmunoscintigraphy of the colorectal primary tumors and their locoregional recurrences. It was labeled with 99mTc using the Schwarz method, with a > 95% performance. Planar images of the chest, abdomen and pelvis were performed at 10 minutes, 4-6 hours and 18-24 hours post-injection in the anterior and posterior projections and the SPECT was performed 4-6 hours and 18-24 hours post-injection of 1.85 GBq 99mTC. This study has aimed to verify in vivo the capacity of ior-C5 MAb to accumulate in the malignant colorectal lesions. ior-C5 accumulated in 5 out of the 7 patients who were studied and who were suffering from colorectal cancer or in whom there was suspicion of recurrence. There was a negative case of primary tumors, which was an adenocarcinoma in situ in a tubular-papillary adenoma. The second case with a negative radioimmunoscintigraphy was a true negative case. CONCLUSIONS It can be concluded that even though the number of patients is quite low, ior-C5 fulfilled the expectations of recognizing the epitope expressed in colorectal tumors in an in vivo human environment.
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Affiliation(s)
- J P Oliva
- Departamento de Medicina Nuclear, Instituto Nacional de Oncología y Radiobiología, (INOR), C. Habana 10400, Cuba.
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16
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Chahin F, Paramesh A, Dwivedi A, Peralta R, O'Malley B, Washington T, Lakra Y. Angiosarcoma of the breast following breast preservation therapy and local radiation therapy for breast cancer. Breast J 2001; 7:120-3. [PMID: 11328320 DOI: 10.1046/j.1524-4741.2001.007002120.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
This is a case of angiosarcoma following breast preservation therapy and local radiation therapy over a 3-year period.
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Affiliation(s)
- F Chahin
- Department of Surgery, North Oakland Medical Centers, Pontiac, Michigan, USA
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17
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Abstract
Traumatic airway injuries fortunately are rare. While sometimes injuries are obvious and initial management straightforward, frequently the diagnosis is difficult. Prompt diagnosis of airway injuries requires a high index of clinical suspicion, complemented by judicious use of endoscopy and radiological imaging. Initial management can be complicated by associated head, neck, and thoracic injuries. Importantly, a patient's airway can be lost because of injudicious use of sedation or failure to be properly cautious during attempts at airway management and endotracheal intubation. Mortality rates and the incidence of late complications remain high and have been related to delays in diagnosis and definitive treatment.
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Affiliation(s)
- R Peralta
- Department of Surgery, Massachusetts General Hospital, Boston 02114, USA
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18
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Rice K, Peralta R, Bast D, de Azavedo J, McGavin MJ. Description of staphylococcus serine protease (ssp) operon in Staphylococcus aureus and nonpolar inactivation of sspA-encoded serine protease. Infect Immun 2001; 69:159-69. [PMID: 11119502 PMCID: PMC97868 DOI: 10.1128/iai.69.1.159-169.2001] [Citation(s) in RCA: 106] [Impact Index Per Article: 4.6] [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] Open
Abstract
Signature tagged mutagenesis has recently revealed that the Ssp serine protease (V8 protease) contributes to in vivo growth and survival of Staphylococcus aureus in different infection models, and our previous work indicated that Ssp could play a role in controlling microbial adhesion. In this study, we describe an operon structure within the ssp locus of S. aureus RN6390. The ssp gene encoding V8 protease is designated as sspA, and is followed by sspB, which encodes a 40.6-kDa cysteine protease, and sspC, which encodes a 12.9-kDa protein of unknown function. S. aureus SP6391 is an isogenic derivative of RN6390, in which specific loss of SspA function was achieved through a nonpolar allelic replacement mutation. In addition to losing SspA, the culture supernatant of SP6391 showed a loss of 22- to 23-kDa proteins and the appearance of a 40-kDa protein corresponding to SspB. Although the 40-kDa SspB protein could degrade denatured collagen, our data establish that this is a precursor form which is normally processed by SspA to form a mature cysteine protease. Culture supernatant of SP6391 also showed a new 42-kDa glucosaminidase and enhanced glucosaminidase activity in the 29 to 32 kDa range. Although nonpolar inactivation of sspA exerted a pleiotropic effect, S. aureus SP6391 exhibited enhanced virulence in a tissue abscess infection model relative to RN6390. Therefore, we conclude that SspA is required for maturation of SspB and plays a role in controlling autolytic activity but does not by itself exert a significant contribution to the development of tissue abscess infections.
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Affiliation(s)
- K Rice
- University of Toronto Department of Laboratory Medicine and Pathobiology, and Sunnybrook and Womens' College Health Science Centre, Department of Microbiology, North York, Ontario, Canada M4N 3M5
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Huesca M, Sun Q, Peralta R, Shivji GM, Sauder DN, McGavin MJ. Synthetic peptide immunogens elicit polyclonal and monoclonal antibodies specific for linear epitopes in the D motifs of Staphylococcus aureus fibronectin-binding protein, which are composed of amino acids that are essential for fibronectin binding. Infect Immun 2000; 68:1156-63. [PMID: 10678920 PMCID: PMC97261 DOI: 10.1128/iai.68.3.1156-1163.2000] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [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] Open
Abstract
A fibronectin (Fn)-binding adhesin of Staphylococcus aureus contains three tandem 37- or 38-amino-acid motifs (D1, D2, and D3), which function to bind Fn. Plasma from patients with S. aureus infections contain antibodies that preferentially recognize ligand induced binding sites in the D motifs and do not inhibit Fn binding (F. Casolini, L. Visai, D. Joh, P. G. Conaldi, A. Toniolo, M. Höök, and P. Speziale, Infect. Immun. 66:5433-5442, 1998). To eliminate the influence of Fn binding on antibody development, we used synthetic peptide immunogens D1(21-34) and D3(20-33), which each contain a conserved pattern of amino acids that is essential for Fn binding but which cannot bind Fn without N- or C-terminal extensions. The D3(20-33) immunogen promoted the production of polyclonal antibodies that were 10-fold more effective as inhibitors of Fn-binding to the D3 motif than antibodies obtained by immunizing with an extended peptide D3(16-36), which exhibits functional Fn binding. The D3(20-33) immunogen also facilitated the production of a monoclonal antibody, 9C3, which was highly specific for the epitope SVDFEED, and abolished Fn binding by the D3 motif. When mixed with polyclonal anti-D1(21-34) immunoglobulin G, 70% inhibition of Fn binding to the three tandem D motifs was achieved compared to no more than 30% inhibition with either antibody preparation alone. Therefore, by immunizing with short synthetic peptides that are unable to bind Fn, we have effectively stimulated the production of antibodies specific for epitopes comprised of amino acids that are essential for Fn binding. Although these epitopes occur within a conserved pattern of amino acids that is required for Fn binding, the antibodies recognized specific linear epitope sequences and not a conserved structure common to all repeated motifs.
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Affiliation(s)
- M Huesca
- Division of Microbiology, Sunnybrook and Women's College Health Sciences Centre, North York, Ontario M4N 3M5, Canada
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Oliva J, Pimentel G, Peralta R, Borrón M, Ortiz R, Gutiérrez J, Guerra J, Quesada W, Dopico R, Casanova F, Baum RP. [Radioimmunoscintigraphy of colorectal cancer using the anti-CEA monoclonal antibody BW 431/26. Final results]. Rev Esp Med Nucl 1999; 18:5-15. [PMID: 10074212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
Abstract
The anti-carcinoembryonic antigen (CEA) antibody, BW 431/26 (Scintimun CEA, Behringwerke, Marburg, Germany ) labeled with technetium pertechnectate (99mTc), is an intact immunoglobulin G1, monoclonal antibody that has been used to image colorectal cancer. Planar and SPECT images of chest, abdomen and pelvis were performed at 10 minutes, 4-6 and 18-24 hours after the intravenous antibody injection. 44 patients were studied and the pathological antibody concentration localization by radioimmunoimaging (RI) were correlated with surgical, clinical and other imaging modality findings to validate the RI. The RI was positive in 29 patients and negative in the other 15 patients. The CEA and CA 19.9 were elevated in the serum of some patients with primary tumors or recurrence. The HAMA were determined in all the patients before and after the RI.
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Affiliation(s)
- J Oliva
- Dpto. Medicina Nuclear, Instituto Nacional de Oncología y Radiobiología, C. Habana,1047, Cuba
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Paramesh A, Casale T, Peralta R, Phan T, Prakash S, Silva Y. Tandem subdiaphragmatic and pleural sequelae due to lost gallstones following cholecystectomy. JSLS 1998; 2:285-8. [PMID: 9876756 PMCID: PMC3015305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
We report two similar thoracoabdominal complications we encountered due to retained gallstones after cholecystectomy. These patients had had an open cholecystectomy after a failed laparoscopic attempt, with spillage of gallbladder debris intraoperatively. They were admitted more than 12 months later with subdiaphragmatic abscesses. Attempted computerized axial tomography (CT) guided drainage of these abscesses resulted in these patients developing pleural fluid collections, which required surgical drainage. The patients underwent exploratory laparotomies, and drainage of the subdiaphragmatic abscesses had revealed gallstones within the abscess cavity. A detailed presentation of these cases, with review of current literature and clinicopathologic issues for discussion are described.
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Affiliation(s)
- A Paramesh
- Department of Surgery, North Oakland Medical Centers, Pontiac, MI 48341, USA
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León C, Rodriguez R, Peralta R, Alvarez C, Castaño VM. Synthesis and Characterization of Poly Methyl Acrylate-Poly Ethyl Acrylate Copolymer. INT J POLYM MATER PO 1997. [DOI: 10.1080/00914039708039758] [Citation(s) in RCA: 5] [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: 10/23/2022]
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Peralta R. A highly thermostable β-glucosidase activity from the thermophilic fungus Humicola grisea var. thermoidea: purification and biochemical characterization. FEMS Microbiol Lett 1997. [DOI: 10.1016/s0378-1097(96)00490-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Vasilyev OB, Leyva A, Muhila A, Valdes M, Peralta R, Kovalenko AP, Welch RM, Berendes TA, Isakov VY, Kulikovskiy YP, Sokolov SS, Strepanov NN, Gulidov SS, von Hoyningen-Huene W. Spectroradiometer with wedge interference filters (SWIF): measurements of the spectral optical depths at Mauna Loa Observatory. Appl Opt 1995; 34:4426-4436. [PMID: 21052277 DOI: 10.1364/ao.34.004426] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A spectroradiometer with wedge interference filters (SWIF) (the filters were produced by Carl Zeiss, Jena, Germany) and a CCD matrix (which was of Russian production) that functions as the sensor has been designed and built for use in ground-based optical sensing of the atmosphere and the Earth's surface in the spectral range of 0.35-1.15 µm. Absolute calibration of this instrument was performed through a series of observations of direct solar radiation at Mauna Loa Observatory (MLO) in Hawaii in May and June 1993. Spectral optical depth (SOD) measurements that were made during these field experiments provided detailed spectral information about both aerosol extinction (scattering plus absorption) and molecular absorption in the atmosphere above the site at MLO. The aerosol-SOD measurements were compared with narrow-band radiometer measurements at wavelengths of 380, 500, and 778 nm The SWIF and narrow-band radiometer measurements are in agreement to within the experimental error. At a wavelength of 500 nm, the aerosol SOD was found to be approximately 0.045. Adescription of the SWIF instrument, its absolute calibration, and the determination of atmospheric SOD's at MLO are presented.
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