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Chong H, Lee S, Cho Y, Kim J, Koo JH, Pyo Kim Y, Kim Y, Woo JH, Hyun Ahn D. Assessment of air quality in North Korea from satellite observations. Environ Int 2023; 171:107708. [PMID: 36571994 DOI: 10.1016/j.envint.2022.107708] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 11/25/2022] [Accepted: 12/19/2022] [Indexed: 06/17/2023]
Abstract
North Korea's air quality is poorly understood due to a lack of reliable data. Here, we analyzed urban- to national-scale air quality changes in North Korea using multi-year satellite observations. Pyongyang, Nampo, Pukchang, and Munchon were identified as pollution hotspots. On a national scale, we found that North Korea experienced 6.7, 17.8, and 20.6 times greater amounts of nitrogen dioxide (NO2), sulfur dioxide (SO2), and carbon monoxide (CO) per unit primary energy supply (PES) than South Korea from 2005 to 2018. Besides, North Korea had a 24.3 times larger aerosol optical depth (AOD) per PES than South Korea from 2011 to 2018. Severe CO and aerosol pollution is aligned with extensive biofuel combustion. High SO2 pollution corresponds with the strong coal dependence of the industry. The change rates of the national average columns for NO2, SO2, and CO were + 3.6, -4.4, and -0.4 % yr-1, respectively. The AOD change rate was -4.8 % yr-1. Overall decreasing trends, except for NO2, are likely due to a decline in coal-fired PES. Positive NO2 trends are consistent with increasing industrial activities. Each pollutant showed consistent patterns of linear trends, even after correcting the influence of transboundary pollution. Flue gas control and biofuel consumption reduction seem necessary to improve North Korea's air quality.
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Affiliation(s)
- Heesung Chong
- Department of Atmospheric Sciences, Yonsei University, Seoul, 03722, Republic of Korea
| | - Seoyoung Lee
- Department of Atmospheric Sciences, Yonsei University, Seoul, 03722, Republic of Korea
| | - Yeseul Cho
- Department of Atmospheric Sciences, Yonsei University, Seoul, 03722, Republic of Korea
| | - Jhoon Kim
- Department of Atmospheric Sciences, Yonsei University, Seoul, 03722, Republic of Korea.
| | - Ja-Ho Koo
- Department of Atmospheric Sciences, Yonsei University, Seoul, 03722, Republic of Korea
| | - Yong Pyo Kim
- Department of Chemical Engineering and Materials Science, Ewha Womans University, Seoul, 03760, Republic of Korea
| | - Younha Kim
- International Institute for Applied Systems Analysis, A-2361, Laxenburg, Austria
| | - Jung-Hun Woo
- Department of Technology Fusion Engineering, Konkuk University, Seoul, 05029, Republic of Korea
| | - Dha Hyun Ahn
- Department of Atmospheric Sciences, Yonsei University, Seoul, 03722, Republic of Korea
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Dhingra M, Chong H, Shyamsundar S. 139 Absence of Coding in an Outpatient Paediatric Orthopaedic Department – Where Does the Money Go? Br J Surg 2022. [DOI: 10.1093/bjs/znac039.080] [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: 11/12/2022]
Abstract
Abstract
Aim
Paediatric orthopaedics conditions are often managed in the outpatient department (OPD) setting. Due to the lack of official coding for these minor procedures in our OPD, the hospital receives neither financial benefit nor evidence for a formal auditing process. With the Paediatric Get It Right First Time (GIRFT) report underway, we have looked at building a coding pathway for paediatric interventions in our OPD.
Method
The number of paediatric orthopaedic interventions were collated and grouped in a 6-month period, and a clinical outcome form was created accordingly. After consulting with the coding department, a cost analysis of prospective earnings was conducted, as well as comparisons to current standard tariff rates for OPD attendance.
Results
From January 2021 to June 2021, 100 interventions were performed in our OPD with the breakdown of: 21 clubfoot serial casting, 70 serial casting for pathology such as tip toe walkers, 6 Botox injections in spastic contracture limbs and 3 Pavlik harnesses for developmental dysplasia of the hip. With the assistance of coding department, a new paediatric procedural coding form was created with 14 relevant interventions listed. A loss of £6110 was calculated due to tariff rates being solely attendance based compared to interventional based.
Conclusions
Paediatric orthopaedic OPD should have clinical coding outcomes in place for each intervention that is performed to ensure that the hospital trust receives appropriate financial commission as well as ensure a formal audit trial can be produced.
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Affiliation(s)
- M. Dhingra
- Kettering General Hospital, Kettering, United Kingdom
| | - H. Chong
- Kettering General Hospital, Kettering, United Kingdom
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Eddens T, Mack M, McCormick M, Chong H, Kalpatthi R. A042 TRENDS IN PEDIATRIC PRIMARY IMMUNODEFICIENCY: INCIDENCE, UTILIZATION, HEMATOPOIETIC STEM CELL TRANSPLANTATION, AND MORTALITY. Ann Allergy Asthma Immunol 2021. [DOI: 10.1016/j.anai.2021.08.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ra AG, Kelly A, Szakacs SM, Chong H, Gordon K. The blister that got out of hand. Clin Exp Dermatol 2021; 46:595-598. [PMID: 33427314 DOI: 10.1111/ced.14532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 11/23/2020] [Accepted: 11/30/2020] [Indexed: 11/29/2022]
Affiliation(s)
- A G Ra
- Department of Dermatology, St George's University Hospital, London, UK
| | - A Kelly
- Department of Dermatology, St George's University Hospital, London, UK
| | - S M Szakacs
- Department of Pathology, St George's University Hospital, London, UK
| | - H Chong
- Department of Pathology, St George's University Hospital, London, UK
| | - K Gordon
- Department of Dermatology, St George's University Hospital, London, UK
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Koo JH, Kim J, Lee YG, Park SS, Lee S, Chong H, Cho Y, Kim J, Choi K, Lee T. The implication of the air quality pattern in South Korea after the COVID-19 outbreak. Sci Rep 2020; 10:22462. [PMID: 33384456 PMCID: PMC7775425 DOI: 10.1038/s41598-020-80429-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Accepted: 12/15/2020] [Indexed: 12/01/2022] Open
Abstract
By using multiple satellite measurements, the changes of the aerosol optical depth (AOD) and nitrogen dioxide (NO2) over South Korea were investigated from January to March 2020 to evaluate the COVID-19 effect on the regional air quality. The NO2 decrease in South Korea was found but not significant, which indicates the effects of spontaneous social distancing under the maintenance of ordinary life. The AODs in 2020 were normally high in January, but they became lower starting from February. Since the atmosphere over Eastern Asia was unusually stagnant in January and February 2020, the AOD decrease in February 2020 clearly reveals the positive effect of the COVID-19. Considering the insignificant NO2 decrease in South Korea and the relatively long lifetime of aerosols, the AOD decrease in South Korea may be more attributed to the improvement of the air quality in neighboring countries. In March, regional atmosphere became well mixed and ventilated over South Korea, contributing to large enhancement of air quality. While the social activity was reduced after the COVID-19 outbreak, the regional meteorology should be also examined significantly to avoid the biased evaluation of the social impact on the change of the regional air quality.
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Affiliation(s)
- Ja-Ho Koo
- Department of Atmospheric Sciences, Yonsei University, Seoul, Republic of Korea
| | - Jhoon Kim
- Department of Atmospheric Sciences, Yonsei University, Seoul, Republic of Korea.
| | - Yun Gon Lee
- Department of Atmospheric Sciences, Chungnam National University, Daejeon, Republic of Korea.
| | - Sang Seo Park
- School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
| | - Seoyoung Lee
- Department of Atmospheric Sciences, Yonsei University, Seoul, Republic of Korea
| | - Heesung Chong
- Department of Atmospheric Sciences, Yonsei University, Seoul, Republic of Korea
| | - Yeseul Cho
- Department of Atmospheric Sciences, Yonsei University, Seoul, Republic of Korea
| | - Jaemin Kim
- Department of Atmospheric Sciences, Chungnam National University, Daejeon, Republic of Korea
| | - Kyungbae Choi
- Department of Atmospheric Sciences, Chungnam National University, Daejeon, Republic of Korea
| | - Taegyung Lee
- Department of Atmospheric Sciences, Yonsei University, Seoul, Republic of Korea
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Zhou Y, Peng DD, Chong H, Zheng SQ, Zhu F, Wang G. Effect of isoflurane on myocardial ischemia-reperfusion injury through the p38 MAPK signaling pathway. Eur Rev Med Pharmacol Sci 2020; 23:1342-1349. [PMID: 30779102 DOI: 10.26355/eurrev_201902_17029] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE To investigate the effect of isoflurane on myocardial ischemia-reperfusion injury through the p38 mitogen-activated protein kinase (MAPK) signaling pathway. MATERIALS AND METHODS A total of 36 specific-pathogen-free (SPF) Sprague-Dawley rats were randomly divided into sham group (n=12), model group (n=12) and isoflurane group (n=12). In model group and isoflurane group, the myocardial ischemia-reperfusion injury model was established via the ligation of left anterior descending coronary artery (ischemia for 30 min and reperfusion for 3 h). In sham group, the left anterior descending coronary artery was not ligated, but the chest was opened and threaded using the same method. After ischemia, the rats in isoflurane group were inhaled with isoflurane. The cardiac function of rats in each group was detected before ischemia (T0) and once every 2 h after reperfusion (T1-T4) for a total of 5 times, and the cardiac function indexes included ejection fraction (EF), fractional shortening (FS), left ventricular systolic pressure (LVSP) and left ventricular end-diastolic pressure (LVEDP). After the rats were executed, the myocardial infarction tissues were taken for hematoxylin-eosin (HE) staining and 2,3,5-triphenyltetrazolium chloride (TTC) staining to observe the morphological changes in tissues and the degrees of myocardial ischemia and infarction. The malondialdehyde (MDA) content and superoxide dismutase (SOD) activity in myocardial cells in the infarction site in each group were detected using the MDA and SOD kits. Moreover, the expression levels of related proteins in the p38 MAPK signaling pathway in myocardial cells in the infarction site were detected via Western blotting. RESULTS In model group, the cardiac function was significantly damaged (p<0.01), there was significant pathological damage in the myocardium, the area of myocardial infarction was significantly increased (p<0.01), the MDA content was significantly increased (p<0.01), the SOD activity declined obviously (p<0.01), and the expression levels of p-p38 and p-tau protein were significantly increased (p<0.01) compared with those in control group. After intervention with isoflurane, the cardiac function of rats was significantly improved (p<0.01), the pathological damage in myocardial tissues was alleviated, the area of myocardial infarction was reduced (p<0.01), the MDA content declined (p<0.01), the SOD activity was increased (p<0.01), and the expression levels of p-p38 and p-tau protein were decreased (p<0.01). CONCLUSIONS Isoflurane can, through inhibiting the p38 MAPK signaling pathway, effectively protect the cardiac function of rats from myocardial ischemia-reperfusion injury, reduce the area of myocardial infarction, alleviate the pathological damage in myocardial cells and reduce the oxidative stress response.
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Affiliation(s)
- Y Zhou
- Department of Anesthesiology, Beijing Jishuitan Hospital, Beijing, China.
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Witham MD, Band M, Chong H, Donnan PT, Hampson G, Hu MK, Kalra P, Kennedy G, Lamb E, Littleford R, McNamee P, Plews D, Rauchhaus P, Soiza RL, Sumukadas D, Warwick G, Avenell A. 104 Oral Sodium Bicarbonate Therapy for Older Patients with Chronic Kidney Disease and Low-Grade Acidosis: The BiCARB Randomised Controlled Trial. Age Ageing 2020. [DOI: 10.1093/ageing/afz196.06] [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: 11/12/2022] Open
Abstract
Abstract
Background
Oral sodium bicarbonate is often used to treat metabolic acidosis in older people with advanced chronic kidney disease, but evidence is lacking on whether this provides a net gain in health or quality of life.
Methods
We conducted a multicentre, parallel group, double-blind, placebo-controlled randomised trial. Adults aged 60 years and over with category 4 or 5 chronic kidney disease, not on dialysis, with serum bicarbonate concentrations <22 mmol/L were recruited from 27 UK centres. Participants were randomised 1:1 to oral sodium bicarbonate or matching placebo. The primary outcome was the between-group difference in the Short Physical Performance Battery at 12 months, adjusted for baseline. Other key outcome measures included generic and disease-specific health-related quality of life, anthropometry, physical performance, renal function, adverse events including commencement of renal replacement therapy, and health economic analysis.
Results
We randomised 300 participants, mean age 74 years; 86 (29%) were female. Mean baseline estimated GFR was 19 ml/min/1.73m2. Study medication adherence was 73% in both groups. No significant treatment effect was evident for the primary outcome of the between-group difference in the Short Physical Performance Battery at 12 months (-0.4 points; 95% CI -0.9 to 0.1, p=0.15). No significant treatment benefit was seen for any of the secondary outcomes. Adverse events were more frequent in the bicarbonate arm (457 versus 400). Time to commencing renal replacement therapy was similar in both groups (HR 1.22, 95% CI 0.74 to 2.02, p=0.43). Health economic analysis showed lower quality of life and higher costs in the bicarbonate arm at one year (£1234 vs £807); placebo dominated bicarbonate under all sensitivity analyses for incremental cost-effectiveness.
Conclusions
Oral sodium bicarbonate did not improve a wide range of health measures in this trial, and is unlikely to be cost-effective for use in the UK NHS in this patient group.
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Affiliation(s)
- M D Witham
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - M Band
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - H Chong
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - P T Donnan
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - G Hampson
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - M K Hu
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - P Kalra
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - G Kennedy
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - E Lamb
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - R Littleford
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - P McNamee
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - D Plews
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - P Rauchhaus
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - R L Soiza
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - D Sumukadas
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - G Warwick
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
| | - A Avenell
- Academic Unit of Elderly Care and Rehabilitation, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
- Born in Bradford, Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom
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Chong H, Lee H, Koo JH, Kim J, Jeong U, Kim W, Kim SW, Herman JR, Abuhassan NK, Ahn J, Park JH, Kim SK, Moon KJ, Choi WJ, Park SS. Regional characteristics of NO 2 column densities from Pandora observations during the MAPS-Seoul campaign. Aerosol Air Qual Res 2019; 18:2207-2219. [PMID: 31708978 PMCID: PMC6839696 DOI: 10.4209/aaqr.2017.09.0341] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Vertical column density (VCD) of nitrogen dioxide (NO2) was measured using Pandora spectrometers at six sites on the Korean Peninsula during the Megacity Air Pollution Studies-Seoul (MAPS-Seoul) campaign from May to June 2015. To estimate the tropospheric NO2 VCD, the stratospheric NO2 VCD from the Ozone Monitoring Instrument (OMI) was subtracted from the total NO2 VCD from Pandora. European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis wind data was used to analyze variations in tropospheric NO2 VCD caused by wind patterns at each site. The Yonsei/SEO site was found to have the largest tropospheric NO2 VCD (1.49 DU on average) from a statistical analysis of hourly tropospheric NO2 VCD measurements. At rural sites, remarkably low NO2 VCDs were observed. However, a wind field analysis showed that trans-boundary transport and emissions from domestic sources lead to an increase in tropospheric NO2 VCD at NIER/BYI and KMA/AMY, respectively. At urban sites, high NO2 VCD values were observed under conditions of low wind speed, which were influenced by local urban emissions. Tropospheric NO2 VCD at HUFS/Yongin increases under conditions of significant transport from urban area of Seoul according to a correlation analysis that considers the transport time lag. Significant diurnal variations were found at urban sites during the MAPS-Seoul campaign, but not at rural sites, indicating that it is associated with diurnal patterns of NO2 emissions from dense traffic.
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Affiliation(s)
- Heesung Chong
- Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea
| | - Hana Lee
- Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea
| | - Ja-Ho Koo
- Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea
| | - Jhoon Kim
- Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea
- Harvard - Smithsonian Center for Astrophysics, Cambridge, Massachusetts, USA
| | - Ukkyo Jeong
- NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
| | - Woogyung Kim
- NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
| | - Sang-Woo Kim
- School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea
| | - Jay R. Herman
- NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
| | | | - Junyoung Ahn
- National Institute of Environmental Research,Incheon,South Korea
| | - Jeong-Hoo Park
- National Institute of Environmental Research,Incheon,South Korea
| | - Sang-Kyun Kim
- National Institute of Environmental Research,Incheon,South Korea
| | - Kyung-Jung Moon
- National Institute of Environmental Research,Incheon,South Korea
| | - Won-Jun Choi
- National Institute of Environmental Research,Incheon,South Korea
| | - Sang Seo Park
- School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea
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Coffey K, Chong H. IDIOPATHIC HYPEREOSINOPHILIC SYNDROME IN A PEDIATRIC PATIENT TREATED WITH BENRALIZUMAB. Ann Allergy Asthma Immunol 2018. [DOI: 10.1016/j.anai.2018.09.421] [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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Mahendran P, Chong H, Akhras V. Multiple perioral homogenous blue macules. Clin Exp Dermatol 2018; 43:617-619. [PMID: 29635705 DOI: 10.1111/ced.13423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/21/2016] [Indexed: 12/01/2022]
Affiliation(s)
- P Mahendran
- Department of Dermatology, St George's Hospital, London, UK
| | - H Chong
- Department of Cellular Pathology, St George's Hospital, London, UK
| | - V Akhras
- Department of Dermatology, St George's Hospital, London, UK
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Affiliation(s)
- C. A. Maguire
- Department of Dermatology; St George's Healthcare NHS Trust; London UK
| | - H. Chong
- Department of Cellular Pathology; St George's Healthcare NHS Trust; London UK
| | - R. Ramachandran
- Department of Chemical Pathology and Metabolic Medicine; Guy's and St Thomas’ NHS Foundation Trust; London UK
| | - J. Popoola
- Department of Nephrology; St George's Healthcare NHS Trust; London UK
| | - V. Akhras
- Department of Dermatology; St George's Healthcare NHS Trust; London UK
| | - M. Singh
- Department of Dermatology; St George's Healthcare NHS Trust; London UK
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12
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Denny J, Chong H, Akhras V. Lichen planus in a patient treated with pembrolizumab for metastatic malignant melanoma. Clin Exp Dermatol 2017; 43:354-356. [DOI: 10.1111/ced.13315] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/13/2017] [Indexed: 11/26/2022]
Affiliation(s)
- J. Denny
- Department of Dermatology; St George's Hospital; London UK
| | - H. Chong
- Department of Cellular Pathology; St George's Hospital; London UK
| | - V. Akhras
- Department of Dermatology; St George's Hospital; London UK
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13
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Jain S, Larkin A, Chong H. OR063 A case of recurrent splenic lesions in a patient with Vici syndrome. Ann Allergy Asthma Immunol 2017. [DOI: 10.1016/j.anai.2017.08.051] [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: 10/18/2022]
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14
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Mahendran P, Wee J, Chong H, Natkunarajah J. Necrobiotic xanthogranuloma treated with lenalidomide. Clin Exp Dermatol 2017; 43:345-347. [PMID: 29048134 DOI: 10.1111/ced.13293] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/21/2017] [Indexed: 11/27/2022]
Affiliation(s)
- P Mahendran
- Dermatology Department, Kingston Hospital, London, UK
| | - J Wee
- Dermatology Department, Kingston Hospital, London, UK
| | - H Chong
- Department of Cellular Pathology, St George's Hospital, London, UK
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Ferguson L, Chong H, Singh M. Ecthyma gangrenosum without bacteraemia: evidence in favour of a broader definition. Clin Exp Dermatol 2017; 42:324-327. [PMID: 28239902 DOI: 10.1111/ced.13064] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/01/2016] [Indexed: 11/29/2022]
Abstract
Ecthyma gangrenosum (EG) is often defined as a cutaneous manifestation of Pseudomonas aeruginosa septicaemia, typically secondary to neutropenia. There is increasing recognition that a broader definition is warranted, as numerous causative organisms and predisposing conditions have been reported. We describe two cases of EG that occurred without bacteraemia. In this atypical subset of cases, the skin is thought to represent the primary inoculation site from which haematogenous spread can occur. The first case occurred in the context of human immunodeficiency virus (HIV) infection, a rarely reported association. The evidence base guiding clinicians on management of EG is very limited, particularly in relation to patients with HIV, in whom recurrence risk may be higher than normal. Recurrent EG is described in our second case, in an individual with Good syndrome, a rare association of thymoma and immunodeficiency.
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Affiliation(s)
- L Ferguson
- Department of Dermatology, St George's Hospital, London, UK
| | - H Chong
- Department of Cellular Pathology, St George's Hospital, London, UK
| | - M Singh
- Department of Dermatology, St George's Hospital, London, UK
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Dy G, Morrison S, Chong H, Holt S, Vedder N, Joyner B, Friedrich J, Sorensen M. 052 The Current State of Surgical Training in Transgender Care – A National Survey of Urology and Plastic Surgery Residency Programs. J Sex Med 2017. [DOI: 10.1016/j.jsxm.2016.12.066] [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: 10/20/2022]
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Pesaran T, Karam R, Huether R, Li S, Farber-Katz S, Chamberlin A, Chong H, LaDuca H, Elliott A. Beyond DNA: An Integrated and Functional Approach for Classifying Germline Variants in Breast Cancer Genes. Int J Breast Cancer 2016; 2016:2469523. [PMID: 27822389 PMCID: PMC5086358 DOI: 10.1155/2016/2469523] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2016] [Revised: 09/04/2016] [Accepted: 09/19/2016] [Indexed: 11/17/2022] Open
Abstract
Genetic testing for hereditary breast cancer is an integral part of individualized care in the new era of precision medicine. The accuracy of an assay is reliant on not only the technology and bioinformatics analysis utilized but also the experience and infrastructure required to correctly classify genetic variants as disease-causing. Interpreting the clinical significance of germline variants identified by hereditary cancer testing is complex and has a significant impact on the management of patients who are at increased cancer risk. In this review we give an overview of our clinical laboratory's integrated approach to variant assessment. We discuss some of the nuances that should be considered in the assessment of genomic variants. In addition, we highlight lines of evidence such as functional assays and structural analysis that can be useful in the assessment of rare and complex variants.
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Affiliation(s)
- T. Pesaran
- Ambry Genetics Corp., 15 Argonaut, Aliso Viejo, CA 92656, USA
| | - R. Karam
- Ambry Genetics Corp., 15 Argonaut, Aliso Viejo, CA 92656, USA
| | - R. Huether
- Ambry Genetics Corp., 15 Argonaut, Aliso Viejo, CA 92656, USA
| | - S. Li
- Ambry Genetics Corp., 15 Argonaut, Aliso Viejo, CA 92656, USA
| | - S. Farber-Katz
- Ambry Genetics Corp., 15 Argonaut, Aliso Viejo, CA 92656, USA
| | - A. Chamberlin
- Ambry Genetics Corp., 15 Argonaut, Aliso Viejo, CA 92656, USA
| | - H. Chong
- Ambry Genetics Corp., 15 Argonaut, Aliso Viejo, CA 92656, USA
| | - H. LaDuca
- Ambry Genetics Corp., 15 Argonaut, Aliso Viejo, CA 92656, USA
| | - A. Elliott
- Ambry Genetics Corp., 15 Argonaut, Aliso Viejo, CA 92656, USA
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Mahendran P, Chong H, Gharaie S, Natkunarajah J. Multiple asymptomatic papules. Clin Exp Dermatol 2016; 41:823-4. [PMID: 27663166 DOI: 10.1111/ced.12872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/12/2015] [Indexed: 12/01/2022]
Affiliation(s)
- P Mahendran
- Dermatology Department, Kingston Hospital, Kingston upon Thames, Surrey, UK
| | - H Chong
- Department of Cellular Pathology, St George's Hospital, London, UK
| | - S Gharaie
- Department of Cellular Pathology, Kingston Hospital, Kingston upon Thames, Surrey, UK
| | - J Natkunarajah
- Dermatology Department, Kingston Hospital, Kingston upon Thames, Surrey, UK.
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Worsnop F, Chong H, Ostlere L, Natkunarajah J. Acute generalized exanthematous pustulosis mimicking toxic epidermal necrolysis in patients with psoriasis: a coincidence? Clin Exp Dermatol 2015; 40:688-9. [PMID: 25677856 DOI: 10.1111/ced.12590] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/08/2014] [Indexed: 11/27/2022]
Affiliation(s)
- F Worsnop
- Department of Dermatology, Kingston Hospital, London, UK.
| | - H Chong
- Department of Histopathology, St Georges Hospital, London, UK
| | - L Ostlere
- Department of Dermatology, Kingston Hospital, London, UK
| | - J Natkunarajah
- Department of Dermatology, Kingston Hospital, London, UK
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Wee J, Chong H, Natkunarajah J, Mortimer P, Moosa Y. Familial multiple discoid fibromas: unique histological features and therapeutic response to topical rapamycin. Br J Dermatol 2013; 169:177-80. [DOI: 10.1111/bjd.12315] [Citation(s) in RCA: 8] [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] [Accepted: 03/13/2013] [Indexed: 11/28/2022]
Affiliation(s)
| | - H. Chong
- Pathology; St George's Hospital; London SW17 0QT U.K
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Wee JS, Moosa Y, Misch K, Chong H, Natkunarajah J. Actinic granuloma: a history of photoexacerbation and the importance of a radial 'three-zone' biopsy. Clin Exp Dermatol 2012; 38:219-21. [PMID: 23020807 DOI: 10.1111/j.1365-2230.2012.04451.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- J S Wee
- Department of Dermatology, Kingston Hospital, Surrey, UK.
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Liu A, Fanning L, Chong H, Fernandez J, Sloane D, Sancho-Serra M, Castells M. Desensitization regimens for drug allergy: state of the art in the 21st century. Clin Exp Allergy 2011; 41:1679-89. [PMID: 21883538 DOI: 10.1111/j.1365-2222.2011.03825.x] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Adverse reactions to drugs are increasingly being recognized as important contributions to disease in their own right as well as impediments to the best treatment of various conditions, including infectious, autoimmune, and neoplastic maladies. Rapid drug desensitization (RDD) is an effective mechanism for safely administering important medications while minimizing or entirely circumventing such adverse reactions in sensitized patients. We reviewed the literature on RDD in the last 10 years, including our experience from the Brigham and Women's Hospital Desensitization Program with hundreds of patients desensitized to a broad variety of drugs. RDD in our programme has been uniformly successful in patients with hypersensitivity reactions to antibiotics, chemotherapeutics, and monoclonal antibodies. Any reactions that occur during desensitization are generally much less severe than the initial hypersensitivity reaction to the drug, and patients have received the full dose of the desired medication 99.9% of the time out of (796) desensitizations. To date, there have been no fatalities. RDD is a safe and highly effective method for treating sensitized patients with the optimal pharmacologic agents. Its use should be expanded, but because patient safety is paramount, protocols must be created, reviewed, and overseen by allergist-immunologists with special training and experience in modern techniques of desensitization.
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Affiliation(s)
- A Liu
- Drug Desensitization Unit, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
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Mitra A, Conway C, Walker C, Cook M, Powell B, Lobo S, Chan M, Kissin M, Layer G, Smallwood J, Ottensmeier C, Stanley P, Peach H, Chong H, Elliott F, Iles MM, Nsengimana J, Barrett JH, Bishop DT, Newton-Bishop JA. Melanoma sentinel node biopsy and prediction models for relapse and overall survival. Br J Cancer 2010; 103:1229-36. [PMID: 20859289 PMCID: PMC2967048 DOI: 10.1038/sj.bjc.6605849] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
BACKGROUND To optimise predictive models for sentinal node biopsy (SNB) positivity, relapse and survival, using clinico-pathological characteristics and osteopontin gene expression in primary melanomas. METHODS A comparison of the clinico-pathological characteristics of SNB positive and negative cases was carried out in 561 melanoma patients. In 199 patients, gene expression in formalin-fixed primary tumours was studied using Illumina's DASL assay. A cross validation approach was used to test prognostic predictive models and receiver operating characteristic curves were produced. RESULTS Independent predictors of SNB positivity were Breslow thickness, mitotic count and tumour site. Osteopontin expression best predicted SNB positivity (P=2.4 × 10⁻⁷), remaining significant in multivariable analysis. Osteopontin expression, combined with thickness, mitotic count and site, gave the best area under the curve (AUC) to predict SNB positivity (72.6%). Independent predictors of relapse-free survival were SNB status, thickness, site, ulceration and vessel invasion, whereas only SNB status and thickness predicted overall survival. Using clinico-pathological features (thickness, mitotic count, ulceration, vessel invasion, site, age and sex) gave a better AUC to predict relapse (71.0%) and survival (70.0%) than SNB status alone (57.0, 55.0%). In patients with gene expression data, the SNB status combined with the clinico-pathological features produced the best prediction of relapse (72.7%) and survival (69.0%), which was not increased further with osteopontin expression (72.7, 68.0%). CONCLUSION Use of these models should be tested in other data sets in order to improve predictive and prognostic data for patients.
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Affiliation(s)
- A Mitra
- Section of Epidemiology and Biostatistics, Leeds Institute of Molecular Medicine, St James's University Hospital, Beckett Street, Leeds LS97TF, UK.
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Desai N, Natkunarajah J, Chong H, Millington GMW. Symmetrical papulonodular eruption of the elbows. Clin Exp Dermatol 2010; 35:e199-200. [PMID: 20518915 DOI: 10.1111/j.1365-2230.2009.03744.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- N Desai
- Department of Dermatology, St. George's Hospital, Tooting, London, UK.
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Natkunarajah J, Simpson L, Chong H, Millington GW, Marsden RA. Mottled legs. Cholesterol emboli syndrome (CES). Clin Exp Dermatol 2010; 35:e70-1. [PMID: 20500188 DOI: 10.1111/j.1365-2230.2009.03467.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- J Natkunarajah
- Department of Dermatology, St George's Hospital, London, UK.
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Ball E, McGrath E, Chong H, Moss A. Rhabdomyomatous mesenchymal hamartoma resembling scleroderma ‘en coup de sabre’: a case report and literature review. Br J Dermatol 2009; 162:222-4. [DOI: 10.1111/j.1365-2133.2009.09535.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Wickner PG, Cahill K, Cheifetz A, Sheikh J, Gaffin JM, Sheehan WJ, Morrill J, Sawicki G, Twarog F, Cinar M, Young M, Schneider LC, Phipatanakul W, Permaul P, Stutius LM, Sheehan WJ, Rangsithienchai PA, Walter JE, Young M, Twarog F, Schneider LC, Phipatanakul W, Sheehan WJ, Rangsithienchai PA, Baxi S, Phipatanakul W, Van Stee V, Bielory L, Wheeler J, Robertson D, Bayuk J, Accetta D, Chong H, Wolf R, Kim S, Long A. Research abstracts presented at the New England Society of Allergy, Fall Meeting, Brewster, Massachusetts, October 20, 2008. Allergy Asthma Proc 2009. [DOI: 10.2500/aap.2009.30.3213] [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]
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Chaudhry I, Chong H, Brady K, Metze D, Calonje E. Subcutaneous Nodules at Injection Sites: Histopathological Pitfalls in Diagnosis. J Cutan Pathol 2008. [DOI: 10.1111/j.0303-6987.2005.320an.x] [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: 12/01/2022]
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Ross GL, Chong H, Collyns T, Gascoyne-Binzi DM, Sarkany RPE. Lichen scrofulosorum caused by Mycobacterium szulgai: a new cause of a tuberculide reaction. Br J Dermatol 2007; 156:586-7. [PMID: 17300260 DOI: 10.1111/j.1365-2133.2007.07683.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gray-Schopfer VC, Cheong SC, Chong H, Chow J, Moss T, Abdel-Malek ZA, Marais R, Wynford-Thomas D, Bennett DC. Cellular senescence in naevi and immortalisation in melanoma: a role for p16? Br J Cancer 2006; 95:496-505. [PMID: 16880792 PMCID: PMC2360676 DOI: 10.1038/sj.bjc.6603283] [Citation(s) in RCA: 288] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Cellular senescence, the irreversible proliferative arrest seen in somatic cells after a limited number of divisions, is considered a crucial barrier to cancer, but direct evidence for this in vivo was lacking until recently. The best-known form of human cell senescence is attributed to telomere shortening and a DNA-damage response through p53 and p21. There is also a more rapid form of senescence, dependent on the p16-retinoblastoma pathway. p16 (CDKN2A) is a known melanoma susceptibility gene. Here, we use retrovirally mediated gene transfer to confirm that the normal form of senescence in cultured human melanocytes involves p16, since disruption of the p16/retinoblastoma pathway is required as well as telomerase activation for immortalisation. Expression (immunostaining) patterns of senescence mediators and markers in melanocytic lesions provide strong evidence that cell senescence occurs in benign melanocytic naevi (moles) in vivo and does not involve p53 or p21 upregulation, although p16 is widely expressed. In comparison, dysplastic naevi and early (radial growth-phase, RGP) melanomas show less p16 and some p53 and p21 immunostaining. All RGP melanomas expressed p21, suggesting areas of p53-mediated senescence, while most areas of advanced (vertical growth-phase) melanomas lacked both p16 and p21, implying escape from both forms of senescence (immortalisation). Moreover, nuclear p16 but not p21 expression can be induced in human melanocytes by oncogenic BRAF, as found in around 80% of naevi. We conclude that cell senescence can form a barrier to melanoma development. This also provides a potential explanation of why p16 is a melanoma suppressor gene.
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Affiliation(s)
- V C Gray-Schopfer
- Division of Basic Medical Sciences, St George's, University of London, Cranmer Terrace, SW17 0RE, UK
- The Institute for Cancer Research, London SW3 6JB, UK
| | - S C Cheong
- Division of Basic Medical Sciences, St George's, University of London, Cranmer Terrace, SW17 0RE, UK
| | - H Chong
- Division of Cellular and Molecular Medicine, St George's, University of London, London SW17 0RE, UK
| | - J Chow
- Division of Cellular and Molecular Medicine, St George's, University of London, London SW17 0RE, UK
| | - T Moss
- Department of Plastic Surgery, St George's Hospital, London SW17 0QT, UK
| | - Z A Abdel-Malek
- Department of Dermatology, University of Cincinnati, Cincinnati, OH 45267, USA
| | - R Marais
- The Institute for Cancer Research, London SW3 6JB, UK
| | - D Wynford-Thomas
- Department of Pathology, University of Wales College of Medicine, Cardiff, UK
| | - D C Bennett
- Division of Basic Medical Sciences, St George's, University of London, Cranmer Terrace, SW17 0RE, UK
- E-mail:
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Chong H, Brady K, Metze D, Calonje E. Persistent nodules at injection sites (aluminium granuloma) -- clinicopathological study of 14 cases with a diverse range of histological reaction patterns. Histopathology 2006; 48:182-8. [PMID: 16405667 DOI: 10.1111/j.1365-2559.2005.02312.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS To assess and document the spectrum of histological appearances of persistent swellings which occur at injection sites following vaccination or allergen desensitization. METHODS AND RESULTS Fourteen cases were studied. Four overlapping histological reaction patterns were evident. Ten cases showed at least focal fibrosis, fat necrosis and a mixed inflammatory cell infiltrate mainly in the subcutis, giving rise to the features of a non-specific septal and lobular panniculitis. The appearance of three cases, in addition to the non-specific panniculitis pattern, also included prominent lymphoid follicles with germinal centres and a prominent perifollicular infiltrate resembling a lymphoma (pseudolymphoma pattern). A single case mimicked lupus profundus, with a perivascular and periadnexal infiltrate in the dermis and hyaline fat necrosis. Three cases showed a predominantly palisaded histiocytic infiltrate surrounding eosinophilic necrobiosis, in a pattern closely resembling deep granuloma annulare or rheumatoid nodule. The remaining case partly showed this appearance, but in combination with panniculitis, thus demonstrating an overlap of patterns. A common feature in all 14 cases was the focal presence of histiocytes with abundant violaceous granular cytoplasm. These were shown to contain aluminium on energy dispersive X-ray microanalysis. CONCLUSION Persistent swellings at injections sites show a variety of overlapping patterns, which mimic other conditions. Identification of characteristic histiocytes with violaceous granular cytoplasm is the key distinctive feature allowing the correct diagnosis to be reached.
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Affiliation(s)
- H Chong
- Centre for Ultrastructural Imaging, Guy's Campus, King's College London, London, UK.
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Lavrinenko A, Borel P, Frandsen L, Thorhauge M, Harpøth A, Kristensen M, Niemi T, Chong H. Comprehensive FDTD modelling of photonic crystal waveguide components. Opt Express 2004; 12:234-248. [PMID: 19471530 DOI: 10.1364/opex.12.000234] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Planar photonic crystal waveguide structures have been modelled using the finite-difference-time-domain method and perfectly matched layers have been employed as boundary conditions. Comprehensive numerical calculations have been performed and compared to experimentally obtained transmission spectra for various photonic crystal waveguides. It is found that within the experimental fabrication tolerances the calculations correctly predict the measured transmission levels and other major transmission features.
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Borel P, Frandsen L, Thorhauge M, Harpøth A, Zhuang Y, Kristensen M, Chong H. Efficient propagation of TM polarized light in photonic crystal components exhibiting band gaps for TE polarized light. Opt Express 2003; 11:1757-1762. [PMID: 19466056 DOI: 10.1364/oe.11.001757] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We have investigated the properties of TM polarized light in planar photonic crystal waveguide structures, which exhibit photonic band gaps for TE polarized light. Straight and bent photonic crystal waveguides and couplers have been fabricated in silicon-on-insulator material and modelled using a 3D finite-difference-time-domain method. The simulated spectra are in excellent agreement with the experimental results, which show a propagation loss as low as 2.5+/-4 dB/mm around 1525 nm and bend losses at 2.9+/-0.2 dB for TM polarized light. We demonstrate a high coupling for TM polarized light in a simple photonic crystal coupler with a size of ~ 20 m x 20 m. These promising features may open for the realization of ultra-compact photonic crystal components, which are easily integrated in optical communication networks.
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McCormick D, Chong H, Hobbs C, Datta C, Hall PA. Detection of the Ki-67 antigen in fixed and wax-embedded sections with the monoclonal antibody MIB1. Histopathology 2002; 41:173-8. [PMID: 12405952 DOI: 10.1046/j.1365-2559.2002.14891.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- D McCormick
- Division of Histopathology, UMDS, St Thomas's Campus, London, UK
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Abstract
Ras plays an essential role in activation of Raf kinase which is directly responsible for activation of the MEK-ERK kinase pathway. A direct protein-protein interaction between Ras and the N-terminal regulatory domain of Raf is critical for Raf activation. However, association with Ras is not sufficient to activate Raf in vitro, indicating that Ras must activate some other biochemical events leading to activation of Raf. We have observed that RasV12Y32F and RasV12T35S mutants fail to activate Raf, yet retain the ability to interact with Raf. In this report, we showed that RasV12Y32F and RasV12T35S can cooperate with members of the Rho family GTPases to activate Raf while alone the Rho family GTPase is not effective in Raf activation. A dominant negative mutant of Rac or RhoA can block Raf activation by Ras. The effect of Rac or Cdc42 can be substituted by the Pak kinase, which is a direct downstream target of Rac/Cdc42. Furthermore, expression of a kinase inactive mutant of Pak or the N-terminal inhibitory domain of Pak1 can block the effect of Rac or Cdc42. In contrast, Pak appears to play no direct role in relaying the signal from RhoA to Raf, indicating that RhoA utilizes a different mechanism than Rac/Cdc42. Membrane-associated but not cytoplasmic Raf can be activated by Rac or RhoA. Our data support a model by which the Rho family small GTPases play an important role to mediate the activation of Raf by Ras. Ras, at least, has two distinct functions in Raf activation, recruitment of Raf to the plasma membrane by direct binding and stimulation of Raf activating kinases via the Rho family GTPases.
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Affiliation(s)
- W Li
- Department of Biological Chemistry and The Institute of Gerontology, University of Michigan Medical School, Ann Arbor, Michigan 48109-0606, USA
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Chong H, Pangas SA, Bernard DJ, Wang E, Gitch J, Chen W, Draper LB, Cox ET, Woodruff TK. Structure and expression of a membrane component of the inhibin receptor system. Endocrinology 2000; 141:2600-7. [PMID: 10875264 DOI: 10.1210/endo.141.7.7540] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The purification and cloning of a membrane-anchored proteoglycan with affinity for inhibin A are described. Bovine pituitary membranes were isolated, and membrane-anchored proteins were solubilized and used as an enriched source of inhibin binding protein. The extract was passed over an inhibin A affinity column, and a protein, designated p120, was identified as an inhibin-binding moiety. A partial amino acid sequence was determined for the protein, which matched two human complementary DNAs (cDNAs) in the database. The full-length cDNA predicts a 1336-amino acid glycoprotein. Full-length p120-encoding cDNAs were isolated from human testis RNA and cloned into expression vectors. Two p120 messenger RNA transcripts of 4.6 kb and 2 kb are detected in rat pituitary by RNA blot analysis. Similar analysis of rat testis RNA revealed transcripts of identical molecular mass, albeit at lower abundance. To determine the cellular localization of p120 in pituitary and testis, an antibody directed against the predicted extracellular domain of the protein was generated and used in an immunohistochemical analysis of thin tissue sections. p120 immunostaining is coincident with FSHbeta immunopositive gonadotrope cells in rat pituitary. p120 staining is intense in the testicular Leydig cells, which bind iodinated inhibin but not iodinated activin. In summary, an inhibin-binding protein has been isolated that is produced in tissues that are targets of inhibin action.
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Affiliation(s)
- H Chong
- Department of Neurobiology and Physiology, Northwestern University, Evanston, Illinois 60208-2850, USA
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Kayaga J, Souberbielle BE, Sheikh N, Morrow WJ, Scott-Taylor T, Vile R, Chong H, Dalgleish AG. Anti-tumour activity against B16-F10 melanoma with a GM-CSF secreting allogeneic tumour cell vaccine. Gene Ther 1999; 6:1475-81. [PMID: 10467372 DOI: 10.1038/sj.gt.3300961] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Genetic modification of tumour cells with the GM-CSF encoding gene renders these cells more potent, as autologous tumour cell vaccine, than their wild-type counterparts. However, autologous vaccines are impractical for wide-scale clinical use and we have therefore investigated the efficacy of the GM-CSF genetic modification approach with an allogeneic whole cell tumour vaccine. In this report, we show that the allogeneic K1735-M2 (H-2k) melanoma cell vaccine induces a specific protective anti-tumour response against the syngeneic B16-F10 (H-2b) melanoma tumour in C57BL/6J mice. In vitro T cell work demonstrated that vaccination of animals with the allogeneic cell vaccine generated cytotoxic T cells specific for the autologous tumour. In vivo T cell subset depletion experiments also illustrated that this anti-tumour effect was mediated by both CD4+ve and CD8+ve T cells, suggesting that the allogeneic vaccine may operate through the 'cross-priming' phenomenon whereby tumour antigens are processed and presented to T cells by the host's own antigen presenting cells (APC). Thus, we transduced K1735-M2 cells with a GM-CSF expressing retroviral vector and showed anti-tumour activity of the GM-CSF secreting K1735-M2 cells as a therapeutic vaccine against the syngeneic B16-F10 tumour. Our data imply that GM-CSF genetically modified allogeneic whole cell tumour vaccines could be successful in the clinic. In addition, more potent combination gene therapy strategies could be tested using this therapeutic allogeneic vaccine model.
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Affiliation(s)
- J Kayaga
- Department of Oncology, St George's Hospital Medical School, London, UK
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Melcher A, Todryk S, Bateman A, Chong H, Lemoine NR, Vile RG. Adoptive transfer of immature dendritic cells with autologous or allogeneic tumor cells generates systemic antitumor immunity. Cancer Res 1999; 59:2802-5. [PMID: 10383135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
Dendritic cells (DCs) are potent antigen-presenting cells that are capable of priming systemic antitumor immune responses in animal tumor models. However, many of the model tumor systems tested need definition of the specific tumor antigens involved. To use DCs in situations that are more relevant to the majority of human cancers, where the antigens are unknown, we have tested the adoptive transfer of immature DCs in mouse colorectal and melanoma models of varying immunogenicity but with undefined antigens. When DCs admixed with a syngeneic primary tumor inoculum were seeded s.c., the growth of the primary tumor was unchanged; however, if the primary tumor was then surgically excised and the animal was rechallenged with the same tumor, significant protection (75%) was generated when DCs were present in the original primary inoculum of a moderately immunogenic colorectal model (CMT93tk). This effect was not observed when a nonimmunogenic melanoma (B16) was tested in an identical protocol. Next, DCs were injected directly into 6-9-mm established tumors; again, protection (55%) was achieved against a secondary tumor challenge following excision of the primary, but only in the CMT93tk model of moderate immunogenicity. To increase the clinical relevance of this approach still further, we tested irradiated allogeneic K1735 melanoma cells mixed with syngeneic DCs as a vaccine against subsequent challenge with the poorly immunogenic syngeneic melanoma B16. The allogeneic vaccine alone was ineffective, but when admixed with DCs, a significant number of animals rejected a subsequent B16 challenge, suggesting that DCs are able to prime an immune response against melanoma antigens shared between K1735 and B16. The generation of systemic antitumor immunity by adoptive transfer of DCs has significant clinical potential because it is technically straightforward and does not require the definition of specific tumor antigens.
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Affiliation(s)
- A Melcher
- Molecular Medicine Program, Mayo Clinic, Rochester, Minnesota 55905, USA
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Vodovotz Y, Chesler L, Chong H, Kim SJ, Simpson JT, DeGraff W, Cox GW, Roberts AB, Wink DA, Barcellos-Hoff MH. Regulation of transforming growth factor beta1 by nitric oxide. Cancer Res 1999; 59:2142-9. [PMID: 10232601] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
Many tumor cells or their secreted products suppress the function of tumor-infiltrating macrophages. Tumor cells often produce abundant transforming growth factor beta1 (TGF-beta1), which in addition to other immunosuppressive actions suppresses the inducible isoform of NO synthase. TGF-beta1 is secreted in a latent form, which consists of TGF-beta1 noncovalently associated with latency-associated peptide (LAP) and which can be activated efficiently by exposure to reactive oxygen species. Coculture of the human lung adenocarcinoma cell line A549 and ANA-1 macrophages activated with IFN-gamma plus lipopolysaccharide resulted in increased synthesis and activation of latent TGF-beta1 protein by both A549 and ANA-1 cells, whereas unstimulated cultures of either cell type alone expressed only latent TGF-beta1. We investigated whether exposure of tumor cells to NO influences the production, activation, or activity of TGF-beta1.A549 human lung adenocarcinoma cells exposed to the chemical NO donor diethylamine-NONOate showed increased immunoreactivity of cell-associated latent and active TGF-beta1 in a time- and dose-dependent fashion at 24-48 h after treatment. Exposure of latent TGF-beta1 to solution sources of NO neither led to recombinant latent TGF-beta1 activation nor modified recombinant TGF-beta1 activity. A novel mechanism was observed, however: treatment of recombinant LAP with NO resulted in its nitrosylation and interfered with its ability to neutralize active TGF-beta1. These results provide the first evidence that nitrosative stress influences the regulation of TGF-beta1 and raise the possibility that NO production may augment TGF-beta1 activity by modifying a naturally occurring neutralizing peptide.
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Affiliation(s)
- Y Vodovotz
- Radiation Biology Branch, National Cancer Institute, Bethesda, Maryland 20892, USA.
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Abstract
Transforming growth factor-beta1 (TGF-beta) is secreted in a latent form consisting of mature TGF-beta noncovalently associated with its amino-terminal propeptide, which is called latency associated peptide (LAP). Biological activity depends upon the release of TGF-beta from the latent complex following extracellular activation, which appears to be the key regulatory mechanism controlling TGF-beta action. We have identified two events associated with latent TGF-beta (LTGF-beta) activation in vivo: increased immunoreactivity of certain antibodies that specifically detect TGF-beta concomitant with decreased immunoreactivity of antibodies to LAP. Macrophages stimulated in vitro with interferon-gamma and lipopolysaccharide reportedly activate LTGF-beta via cell membrane-bound protease activity. We show through dual immunostaining of paraformaldehyde-fixed macrophages that such physiological TGF-beta activation is accompanied by a loss of LAP immunoreactivity with concomitant revelation of TGF-beta epitopes. The induction of TGF-beta immunoreactivity colocalized with immunoreactive betaglycan/RIII in activated macrophages, suggesting that LTGF-beta activation occurs on the cell surface. Confocal microscopy of metabolically active macrophages incubated with antibodies to TGF-beta and betaglycan/RIII prior to fixation supported the localization of activation to the cell surface. The ability to specifically detect and localize LTGF-beta activation provides an important tool for studies of its regulation.
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Affiliation(s)
- H Chong
- Life Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley 94720, USA
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Chong H, Hutchinson G, Hart IR, Vile RG. Expression of B7 co-stimulatory molecules by B16 melanoma results in a natural killer cell-dependent local anti-tumour response, but induces T-cell-dependent systemic immunity only against B7-expressing tumours. Br J Cancer 1998; 78:1043-50. [PMID: 9792148 PMCID: PMC2063155 DOI: 10.1038/bjc.1998.625] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
In an attempt to enhance the anti-tumour immune response, the co-stimulatory molecules B7-1 or B7-2 were expressed on the surface of B16 melanoma cells. B7-expressing tumours grew more slowly in both syngeneic immunocompetent mice and athymic T cell-immunodeficient nude mice. The delay in growth of B7-expressing tumours was dependent on natural killer (NK) cells, as reductions in tumour growth rates were minimized in mice depleted of NK cells. Systemic immunity to B16 melanoma was examined by vaccination with irradiated tumour cells. Inoculation with irradiated B16 B7-1 cells failed to protect against a subsequent challenge with live parental B16 cells, but conferred partial protection against challenge with live B16 B7-1 cells. In contrast to the local anti-tumour reaction, this protective response was dependent on T cells. The results presented here reveal some of the mechanisms involved in the in vivo response to a poorly immunogenic tumour modified to express co-stimulatory molecules.
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Affiliation(s)
- H Chong
- Department of Histopathology, United Medical and Dental Schools of Guy's and St. Thomas's Hospitals, London, UK
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Abstract
Gene therapy, in particular the transfer of genes encoding immunostimulatory molecules (cytokines and costimulatory molecules) as well as selectively cytotoxic enzymes and DNA vaccination, has the potential of enhancing cell mediated immune responses against tumours including those of colorectal origin. Genes can be transferred using viral vectors either to cultured tumour cells in vitro that can be returned to the patient as a "cancer vaccine", or directly to tumour cells in vivo. Vaccination with DNA constructs expressing specific tumour antigens characteristic of colorectal neoplasia can trigger immune recognition and destruction of tumour cells. The aim is to tip the balance from protumour to antitumour mechanisms by generating a local immune response and systemic antitumour immune memory to destroy metastases. Studies in murine models, combined with human studies, show that such approaches could become an adjunct to current treatments for human colorectal cancer in the near future.
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Affiliation(s)
- S M Todryk
- Laboratory of Molecular Therapy, Imperial Cancer Research Fund Molecular Oncology Unit, Imperial College School of Medicine, Hammersmith Hospital, London W12 0NN, UK
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Diaz RM, Todryk S, Chong H, Hart IR, Sikora K, Dorudi S, Vile RG. Rapid adenoviral transduction of freshly resected tumour explants with therapeutically useful genes provides a rationale for genetic immunotherapy for colorectal cancer. Gene Ther 1998; 5:869-79. [PMID: 9813657 DOI: 10.1038/sj.gt.3300690] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [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: 11/08/2022]
Abstract
To develop protocols for the molecular immunotherapy of colorectal cancer, we compared the efficacy of three separate classes of therapeutic genes to induce antitumour responses in a murine colorectal cell model. Thus, the effects of two cytokines (IL-2 and GM-CSF) were compared with those of a costimulatory gene (B7.1) and a suicide gene (HSVtk). The rank order of efficacy against primary tumour growth was HSVtk[GCV], B7.1 > puro, IL-2 > GM-CSF, neo whereas the order of efficacy in inducing antitumour immunity was GM-CSF, IL-2, > B7.1, HSVtk[GCV] > puro, neo in a prophylactic vaccination model. To exploit these data in a clinically relevant and realistic way, we also demonstrated that colorectal tumours can reproducibly be explanted and established in short-term culture. Finally, a rapid transduction protocol has been developed by which, using adenoviral vectors, as many as 90% of the cells in these fresh tumour explants can be engineered to express high levels of the clinically relevant genes (GM-CSF or IL-2) within 1-2 weeks of surgery. Adenovirus-mediated gene delivery was reproducibly and significantly more efficient than retroviral transduction using the MFG-beta-Gal retroviral vector over the time-frame of importance for vaccination. Hence, combination of the animal model data with the ex vivo modification protocol suggests that vaccination of colorectal patients of the appropriate stage will be possible and effective.
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Affiliation(s)
- R M Diaz
- Richard Dimbleby Department of Cancer Research/ICRF Laboratory, Rayne Institute, St Thomas' Hospital, London, UK
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Chong H, Starkey W, Vile RG. A replication-competent retrovirus arising from a split-function packaging cell line was generated by recombination events between the vector, one of the packaging constructs, and endogenous retroviral sequences. J Virol 1998; 72:2663-70. [PMID: 9525583 PMCID: PMC109708 DOI: 10.1128/jvi.72.4.2663-2670.1998] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.8] [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: 02/06/2023] Open
Abstract
Previously we reported the presence of a replication-competent retrovirus in supernatant from a vector-producing line derived from a widely used split-function amphotropic packaging cell line. Rigorous routine screening of all retroviral stocks produced in our laboratory has not, previously or since, indicated the presence of such a virus. Replication-competent retroviruses have never previously been used in our laboratory, and stringent screening of all routinely used cell lines has not revealed the presence of any helper viruses. Therefore, it is highly unlikely that this virus represents an adventitious cross-contaminant or had been imported unknowingly with our cell line stocks. PCR studies with DNA from infected cell lines and Northern blot analysis and reverse transcriptase PCR with RNA from infected cells suggest that the helper virus arose by recombination events, at sites of partial homology, between sequences in the vector, one of the packaging constructs, and endogenous retroviral elements. These recombinations were not present in stocks of the packaging cell line or in an initial stock of the vector-producing line, indicating that these events occurred while the vector-producing line was being passaged for harvest of supernatant stocks.
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Affiliation(s)
- H Chong
- Division of Histopathology, United Medical and Dental Schools of Guy's and St. Thomas's Hospitals, London, United Kingdom
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Chong H, Todryk S, Hutchinson G, Hart IR, Vile RG. Tumour cell expression of B7 costimulatory molecules and interleukin-12 or granulocyte-macrophage colony-stimulating factor induces a local antitumour response and may generate systemic protective immunity. Gene Ther 1998; 5:223-32. [PMID: 9578842 DOI: 10.1038/sj.gt.3300584] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Previously, we showed that expression of B7-1 in CMT93 murine colorectal tumour cells inhibited their growth in immunocompetent animals. However, this did not result in any significant increase in systemic protective immunity, relative to that elicited by the parental tumour. To potentiate the effects of B7-1 on systemic immunity. Interleukin-12 (IL-12) or granulocyte-macrophage colony-stimulating factor (GM-CSF) was co-expressed with this molecule. These combinations of immunostimulatory molecules were effective in eliciting systemic immunity. We also show that expression of B7-2 led to a local antitumour response as well as significantly raised systemic immunity. In another tumour model. K1735 minutes melanoma, which is moderately immunogenic, tumours secreting GM-CSF alone were as effective as the parental tumours in generating protective immunity. Previously, we described the deleterious effect of B7-1 expression on protective immunity. Co-expression of GM-CSF did not counteract this consequence of B7-1 expression. Expression of IL-12 was extremely effective in causing rejection of inoculated tumour cells, but evoked only minimal protective systemic immunity. These results suggest that combing costimulatory molecules and cytokines may be a useful therapeutic approach in some, but not all, tumours.
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Affiliation(s)
- H Chong
- Division of Histopathology, United Medical and Dental School of Guy's and St Thomas' Hospital, London, UK
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Liu S, Qu X, Wang X, Chong H, Xu J. [Measurement of contraction force of pilot's neck muscles]. Space Med Med Eng (Beijing) 1998; 11:69-70. [PMID: 11541275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
In order to discuss the function of contraction force of pilot's neck region. Contraction force of pilot's neck region was measured in 22 volunteers aged 18-35 years. The mean contraction force is 102-396 N, the mean contraction time is 28 s. Authors think that training for pilot's neck muscular power is essential.
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Affiliation(s)
- S Liu
- Institute of Aviation Medicine, Air Force, Beijing, China
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48
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Castleden SA, Chong H, Garcia-Ribas I, Melcher AA, Hutchinson G, Roberts B, Hart IR, Vile RG. A family of bicistronic vectors to enhance both local and systemic antitumor effects of HSVtk or cytokine expression in a murine melanoma model. Hum Gene Ther 1997; 8:2087-102. [PMID: 9414257 DOI: 10.1089/hum.1997.8.17-2087] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The herpes simplex virus-thymidine kinase/ganciclovir (HSVtk/GCV) system produces both direct and immune-mediated tumor cell killing. Here, we compare the efficacy of HSVtk/GCV with cytokines, alone and in combination, on the tumorigenicity and immunogenicity of B16 cells. With respect to single gene modifications, only HSVtk/GCV, or high-level interleukin-2 (IL-2) secretion, completely prevented tumor growth, whereas granulocyte-macrophage colony-stimulating factor (GM-CSF) generated the best levels of long-term systemic protection. To augment both local killing and immune activation, we constructed bicistronic constructs that express HSVtk and a cytokine within the same cell. Co-expression of HSVtk with IL-2 or GM-CSF enhanced the local antitumor activity of any gene alone. In a tumor-prevention model, HSVtk killing, in an environment preprimed with GM-CSF, generated the best long-term immune protection. However, in a short-term therapy model, continued IL-2 expression was most effective against 3-day established tumors. This probably reflects differences in the activities of IL-2 and GM-CSF in generating short-term, nonspecific immune stimulation compared to long-term immunological memory, respectively. As a prelude to in vivo delivery experiments, we also demonstrated that these bicistronic cassettes can be packaged normally into retroviral (5 x 10(5) virus/ml from pooled populations) and adenoviral vectors (5 x 10(9) virus/ml) and function as predicted within virally infected cells. This family of bicistronic vectors can be used to stimulate synergy between suicide and cytokine genes, overcomes the problems of delivering two genes on separate vectors, and should allow easier preparation of vectors for the delivery of multiple genes to patients' tumor cells.
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Affiliation(s)
- S A Castleden
- Imperial Cancer Research Fund Laboratory of Molecular Therapy, Royal Postgraduate Medical School, Hammersmith Hospital, London, UK
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49
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Abstract
Activin A is a dimeric protein hormone that regulates numerous cellular functions. A clear physiological role for this molecule in pregnancy is suggested by previous studies in the human, wherein activin A rises dramatically as women approach parturition. To determine whether the rodent is a suitable animal model for further studies of activin action during pregnancy, the serum concentration of activin A was measured in pregnant rats. Activin A was detected in the serum of pregnant rats, beginning on day 12, and the serum concentration rose progressively through gestation (22-fold) and dramatically (140-fold) in labor. The potential target tissues for circulating activin were then identified in two ways. First, iodinated activin was injected into pregnant rats, and the tissues targeted by labeled ligand were identified in vivo. A tissue targeted by activin A in the pregnant rat was the uterine myometrium. To determine the ligand specificity of the uterine myometrial cells, the uteri of pregnant rats were collected and analyzed by in situ ligand binding. 125I-activin A binding was specific for the uterus myometrium, and the ligand binding was competed by unlabeled activin A but not by inhibin A. This result suggests that the receptor in this tissue compartment is an activin-specific receptor. The production of abundant activin A and the ability of exogenous ligand to target the myometrium of the uterus provides a pathway by which activin could regulate uterine function during pregnancy.
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Affiliation(s)
- L B Draper
- Department of Medicine, The Center for Reproductive Sciences, Northwestern University, Chicago, Illinois 60611, USA
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Vile RG, Diaz RM, Castleden S, Chong H. Targeted gene therapy for cancer: herpes simplex virus thymidine kinase gene-mediated cell killing leads to anti-tumour immunity that can be augmented by co-expression of cytokines in the tumour cells. Biochem Soc Trans 1997; 25:717-22. [PMID: 9191190 DOI: 10.1042/bst0250717] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- R G Vile
- Imperial Cancer Research Fund Laboratory of Cancer Gene Therapy, Hammersmith Hospital, London, U.K
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