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Paquin R, Lee KT, Reyes C, Byrd JK. Treatment of obstructive sleep apnea after chemoradiation therapy for advanced head and neck cancer. Int J Oral Maxillofac Surg 2024; 53:364-367. [PMID: 36990831 DOI: 10.1016/j.ijom.2023.03.004] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 02/27/2023] [Accepted: 03/13/2023] [Indexed: 03/29/2023]
Abstract
This report presents a case of worsening obstructive sleep apnea (OSA) post-chemoradiation therapy that improved significantly after placement of a hypoglossal nerve stimulator. The patient was a 66-year-old male, diagnosed with head and neck cancer, who experienced exacerbation of OSA after receiving chemoradiation. A hypoglossal nerve stimulator was placed, with minimal complications. The patient showed a significant improvement in OSA as exhibited by the reduction in apnea-hypopnea index. Hypoglossal nerve stimulator placement appears to be a potential treatment option for induced or worsened OSA, which is a known complication of head and neck cancer treatment. When considering treatment options, upper airway stimulation is indeed a possible method in patients who meet the recommended guideline criteria.
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Affiliation(s)
- R Paquin
- Department of Otolaryngology, Head and Neck Surgery, Augusta University, Augusta, Georgia, USA
| | - K T Lee
- Emory University, Atlanta, Georgia, USA.
| | - C Reyes
- Department of Otolaryngology, Head and Neck Surgery, Augusta University, Augusta, Georgia, USA
| | - J K Byrd
- Department of Otolaryngology, Head and Neck Surgery, Augusta University, Augusta, Georgia, USA
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Lee KT, Tan SK, Goh AS. Clinical characteristic and management of haemophilia patients in Malaysia: A single centre experience. Med J Malaysia 2024; 79:170-175. [PMID: 38553922] [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: 04/02/2024]
Abstract
INTRODUCTION Haemophilia is one of the commonest inherited bleeding disorders which may lead to long term disabilities if not treated properly. Our aim of study is to understand the clinical characteristic, treatment and complications of adult haemophilia patients in our centre. MATERIALS AND METHODS A retrospective cross-sectional review of all adult haemophilia A (HA) or haemophilia B (HB) patients who received treatment in Hospital Pulau Pinang from January 2021 to December 2022 was conducted. Data was retrieved from patients' medical records. RESULTS A total of 75 haemophilia patients (64 HA and 11 HB) were included in this study with median age of 37 years (range 19 70). 42 of them had severe haemophilia (50% of HA, 91% of HB). All HB and 93.8% of severe HA patients were on prophylaxis. Six severe and one mild HA patients developed inhibitor with four of them currently on non-factor prophylaxis. 24 patients (32%) had prior hepatitis C infection and all of them have been successfully treated. The mean annual bleeding rate for severe haemophilia patients were 1.77 (SD ±3.6). Target joints were observed in 9.3% of patients with ankle joint (71.4%) being the most affected joint. More than one quarter (26.7%) of our patients have comorbidities with majority of them having hypertension (17/20), followed by diabetes mellitus (5/20) and ischemic heart disease (5/20). CONCLUSION Our study showed that a significant number of adult patients with haemophilia have comorbidities. Apart from optimising factor replacement therapy, future planning should include improvement in screening, risk modification and prevention of cardiovascular disease.
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Affiliation(s)
- K T Lee
- Hospital Pulau Pinang, Department of Medicine, Haematology Unit, Pulau Pinang, Malaysia.
| | - S K Tan
- Hospital Pulau Pinang, Department of Medicine, Haematology Unit, Pulau Pinang, Malaysia
| | - A S Goh
- Hospital Pulau Pinang, Department of Medicine, Haematology Unit, Pulau Pinang, Malaysia
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Gayathiri M, Pulingam T, Lee KT, Mohd Din AT, Kosugi A, Sudesh K. Sustainable oil palm trunk fibre based activated carbon for the adsorption of methylene blue. Sci Rep 2023; 13:22137. [PMID: 38092816 PMCID: PMC10719241 DOI: 10.1038/s41598-023-49079-0] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 12/04/2023] [Indexed: 12/17/2023] Open
Abstract
Activated carbon (AC) is becoming the limelight due to its widespread application as an adsorbent for wastewater treatment, gases, and catalysis. However, its high consumption and price have drawn more attention to the sustainable use of natural resources as precursor for AC production. This study focuses on synthesising AC from two types of oil palm trunk (OPT) fibres, a significant agricultural waste products produced by Malaysia's thriving palm oil industries. The BET surface area of about 2057.9 m2 g-1 was achieved by chemical activation with phosphoric acid (H3PO4). The efficiency of the synthesised AC was critically analysed based on the adsorption experiments with methylene blue (MB) by varying several parameters (dosage of adsorbent, pH, initial dye concentration, and temperature of the solution) to elucidate the adsorption mechanism(s). A maximum adsorption capacity of 320.4 mg g-1 at 50 °C was achieved, and the Temkin (r2 = 0.98, 0.95, 0.95) and Langmuir (r2 = 0.94, 0.93, 0.95) isotherm models fitted the adsorption process better than the Freundlich (r2 = 0.95, 0.90, 0.86) model. Besides, the pseudo-second-order model (r2 > 0.90) best described the adsorption process, favouring chemisorption over physisorption. Thermodynamics showed MB adsorption on AC was spontaneous except at the highest dye concentration. It was exothermic at lower dye concentrations (50 and 100 mg L-1) and endothermic at higher ones (300, 500, and 700 mg L-1). In a nutshell, this study reveals that OPT fibre is a promising precursor for synthesising highly porous AC for the adsorption of MB dye.
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Affiliation(s)
- Muniandy Gayathiri
- School of Biological Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia
| | - Thiruchelvi Pulingam
- School of Biological Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia
| | - K T Lee
- School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, Seri Ampangan, 14300, Nibong Tebal, Penang, Malaysia
| | | | - Akihiko Kosugi
- Japan International Research Center for Agricultural Sciences (JIRCAS), Biological Resources and Post-Harvest Division, 1-1 Ohwashi, Tsukuba, Ibaraki, 305-8686, Japan
- University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
| | - Kumar Sudesh
- School of Biological Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia.
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Foong B, Ho S, Tan L, Lee KT, Jegathesan T. Adhesive Capsulitis Secondary to COVID-19 Vaccination - A Case Series. Malays Orthop J 2023; 17:43-48. [PMID: 37583521 PMCID: PMC10425003 DOI: 10.5704/moj.2307.007] [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: 06/25/2022] [Accepted: 03/23/2023] [Indexed: 08/17/2023] Open
Abstract
Introduction Shoulder injury related to vaccine administration (SIRVA) is a group of pathologies defined by pain and stiffness after intramuscular administration of vaccine to the upper arm and has been reported after COVID-19 vaccination. We aim to discuss its pathophysiology, clinical presentation, treatment and outcomes. Materials and methods We retrospectively identified patients presenting with adhesive capsulitis within four weeks of administration of COVID-19 vaccine to the affected arm at our tertiary institution from March 2021 to December 2022. Result Based on the above criteria, we identified seven cases of adhesive capsulitis, comprising one male and six female patients, with average age of 60 years. We present initial symptoms, signs and the duration from when the vaccine was administered. We have highlighted our treatment strategies as well as the clinical and functional outcomes reported by these patients after treatment. We have reported improvement in both Visual Analogue Scale (VAS) and range of motion (ROM) in all our patients after non-surgical management which included physiotherapy and, in some cases, hydrodilatation. Conclusion SIRVA related adhesive capsulitis is rare and under-reported with limited information in current literature. This study highlights that adhesive capsulitis is a potential complication arising from improper COVID-19 vaccine administration and reinforces traditional wisdom of administering vaccinations on the non-dominant arm. Conservative treatment strategies appear to be effective, particularly hydrodilatation combined with physiotherapy, and patients are expected to have a good return of function.
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Affiliation(s)
- Bcm Foong
- Department of Orthopaedic Surgery, Tan Tock Seng Hospital, Singapore
| | - Swl Ho
- Department of Orthopaedic Surgery, Tan Tock Seng Hospital, Singapore
| | - Ltj Tan
- Department of Orthopaedic Surgery, Tan Tock Seng Hospital, Singapore
| | - K T Lee
- Department of Orthopaedic Surgery, Tan Tock Seng Hospital, Singapore
| | - T Jegathesan
- Department of Orthopaedic Surgery, Tan Tock Seng Hospital, Singapore
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Gayathiri M, Pulingam T, Lee KT, Sudesh K. Activated carbon from biomass waste precursors: Factors affecting production and adsorption mechanism. Chemosphere 2022; 294:133764. [PMID: 35093418 DOI: 10.1016/j.chemosphere.2022.133764] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [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: 12/08/2021] [Revised: 01/17/2022] [Accepted: 01/25/2022] [Indexed: 06/14/2023]
Abstract
The use of activated carbon is evidenced by the increased scope of carbon-based applications in various industrial applications including pharmaceutical antidotes, wastewater remediation, aquaculture and toxin removal. Activated carbon produced from biomass waste by various processing methods and conditions is emerging as a promising adsorbent for remediation of the ecosystem due to extensive discharge of pollutants. Methods of producing activated carbon, nature of lignocellulosic biomass waste, and interaction of adsorbent-adsorbate are some of the crucial factors that need to be scrutinized to produce an effective adsorbent. However, these factors have not been thoroughly discussed in the literature. Activated carbon needs to go through continuous and rigorous research and development through optimization of key parameters such as type of activation (physical/chemical) and processing conditions, especially for large-scale production. It is imperative to have a detailed understanding of the preeminent characteristics of the activated carbon such as pore size distribution, total pore volume, surface area, and yield of activated carbon that control the extents of adsorptions and production of activated carbon. To further clarify the involved mechanism, studies should focus on all the possible variables that influence the system. Therefore, this review provides a better understanding of factors that affect the production of an efficient activated carbon, important properties to be used as an adsorbent, and the involved mechanisms during the adsorption process followed by increasing demand for activated carbon in various fields.
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Affiliation(s)
- Muniandy Gayathiri
- School of Biological Sciences, Universiti Sains Malaysia, 11900, Penang, Malaysia
| | - Thiruchelvi Pulingam
- School of Biological Sciences, Universiti Sains Malaysia, 11900, Penang, Malaysia
| | - K T Lee
- School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, Seri Ampangan, 14300, Nibong Tebal, Pulau Pinang, Malaysia
| | - Kumar Sudesh
- School of Biological Sciences, Universiti Sains Malaysia, 11900, Penang, Malaysia.
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Lee KT, Yeoh WC, Zainul NH, Syed Alwi SB, Low LL. Convalescent plasma as an adjunctive therapy for COVID-19: A single centre experience in Malaysia. Med J Malaysia 2021; 76:653-657. [PMID: 34508370] [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: 06/13/2023]
Abstract
INTRODUCTION The coronavirus disease 2019 (COVID-19) pandemic posed a significant and urgent threat to global health and economy. Currently, there is no effective treatment known to alter the course of COVID-19. Convalescent plasma (CP) has been used previously to treat several types of infections during pandemics. The aim of our study is to evaluate the efficacy of CP in the treatment of severe COVID-19 infections at Hospital Sultanah Bahiyah, Kedah, Malaysia. MATERIALS AND METHODS A retrospective cross-sectional study of all severe COVID-19 patients who received CP treatment from 1st August 2020 until 31st December 2020 was conducted. Clinical outcomes were compared before and after CP transfusion. RESULTS Thirty-four patients were enrolled and received CP transfusion during the study period. The most common presenting complaints were fever (64.7%) and cough (58.8%). Fourteen patients showed improvement in oxygen support after CP transfusion. Several laboratory parameters also improved such as increased lymphocyte count (1.48 vs 1.98, p=0.008) and decreased C-reactive protein levels (28.1 vs 10.6, p=0.004), and these were statistically significant. Median time from symptoms onset to CP transfusion was 6 days (range 1-11) while median time from PCR diagnosis to CP transfusion was 5 days (range 1-11). One patient developed urticaria after CP transfusion and no severe adverse events were observed. Two of our patients passed away due to secondary causes. CONCLUSION This study showed CP treatment was well tolerated and could potentially prevent progression of COVID-19 to a severe disease if administered early during the viraemic phase. Further evaluation with randomized control trial should be conducted to help ascertain the optimal dose and effectiveness of CP treatment, in correlation with the IgG titer of the donated CP.
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Affiliation(s)
- K T Lee
- Hospital Sultanah Bahiyah, Medical Department, Kedah, Malaysia.
| | - W C Yeoh
- Hospital Sultanah Bahiyah, Medical Department, Kedah, Malaysia
| | - N H Zainul
- Hospital Sultanah Bahiyah, Medical Department, Infectious Disease Unit, Kedah, Malaysia
| | - S B Syed Alwi
- Hospital Sultanah Bahiyah, Medical Department, Infectious Disease Unit, Kedah, Malaysia
| | - L L Low
- Hospital Sultanah Bahiyah, Medical Department, Infectious Disease Unit, Kedah, Malaysia
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Low QJ, Lee KT, Lim TH, Siaw C, Cheo SW, Tan NE, Reza MQ. Dilemma in the management of methanol poisoning at a district hospital in Malaysia. Med J Malaysia 2020; 75:442-444. [PMID: 32724013] [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: 06/11/2023]
Abstract
There are increasing reports of methanol poisoning (MP) incidence worldwide. In Malaysia, the largest first methanol poisoning was reported in Selangor in 2013 with a total of 41 patients and cluster of cases been reported from the country since then. Often MP involved adulterated alcohol containing more than the legal permissible concentration of methanol. Methanol is rapidly absorbed and metabolised into formic acid which causes variable symptoms of the central nervous system such as blindness, seizure, coma and gastrointestinal disturbances. Mortality could reach up to 83% as reported using the coma state, pH and pCO2 level in the worst-case scenario.
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Affiliation(s)
- Q J Low
- Hospital Sultanah Nora Ismail, Department of Internal Medicine, Johor, Malaysia.
| | - K T Lee
- Hospital Sultanah Nora Ismail, Department of Internal Medicine, Johor, Malaysia
| | - T H Lim
- Hospital Sultanah Nora Ismail, Department of Internal Medicine, Johor, Malaysia
| | - C Siaw
- Hospital Sultanah Nora Ismail, Department of Internal Medicine, Johor, Malaysia
| | - S W Cheo
- Hospital Lahad Datu, Department of Internal Medicine, Sabah, Malaysia
| | - N E Tan
- Hospital Melaka, Department of Emergency Medicine, 75400 Melaka, Malaysia
| | - M Q Reza
- Hospital Melaka, Department of Emergency Medicine, 75400 Melaka, Malaysia
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Lee KT, Lim SL, Goh AS. Prevalence of endocrine complications in transfusion dependent thalassemia in Hospital Pulau Pinang: A pilot study. Med J Malaysia 2020; 75:33-37. [PMID: 32008017] [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: 06/10/2023]
Abstract
INTRODUCTION Frequent blood transfusions results in iron overload and lead to multiple endocrine complications. In spite of improvements in iron chelation therapy, a significant number of transfusion dependent thalassaemia (TDT) patients still develop endocrine complications. The aim of this study is to evaluate the prevalence of various endocrine complications in our adult TDT patients and to study the correlation with serum ferritin and liver iron concentration (LIC). METHODS A retrospective review of all TDT patients treated in Haematology Unit, Hospital Pulau Pinang (HPP) was conducted. RESULTS Of the 45 adult TDT patients, 22 were males and 23 were females with mean age of 28.8±6.9 years old. Majority of TDT in HPP were beta thalassemia major (71.1%), followed by E-Beta thalassemia (24.4%) and HbH-Constant Spring (4.4%). Frequency of transfusion was 3-4 weekly. 40.0% of adult TDT suffered from at least one endocrine complication. Among the adult TDT patients with endocrine complication, 50% have one endocrinopathy, 38.9% with two types of endocrinopathies and 11.1% of them have three or more types of endocrinopathies. Hypogonadism (22.2%) was the commonest endocrine complication, followed by osteoporosis (20%), hypothyroidism (13.3%), diabetes mellitus (6.7%) and hypocortisolism (4.4%). Patients with endocrine complications were significantly older. Mean serum ferritin level and LIC was higher among patients with endocrine complications but both were not statistically significant. CONCLUSION Endocrinopathy is still prevalent in 40% of adult TDT patients. This leads to higher health-care resource utilization, cost and significant morbidities among patients with TDT. Therefore, regular monitoring and early detection with intensification of chelation therapy is essential.
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Affiliation(s)
- K T Lee
- Hospital Pulau Pinang, Department of Medicine, Malaysia.
| | - S L Lim
- Hospital Pulau Pinang, Department of Medicine, Endocrine Unit, Malaysia
| | - A S Goh
- Hospital Pulau Pinang, Department of Medicine, Haematology Unit, Malaysia
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Chua TH, Emmanuel J, Lee KT, Kan FK, Tee KS, Abidin Z, Ganeswrie R, Tan LH, Low EC, Lim YAL, Menon J. Taeniasis and neurocysticercosis among Malaysians. Trop Biomed 2017; 34:7-13. [PMID: 33592974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Taeniasis, endemic in Southeast Asia, is caused by Taenia saginata (for beef) or Taenia solium and Taenia asiatica (for pork). T. solium also causes cysticercosis which can affect various organs. Taeniasis and cysticercosis cases are rarely reported in Malaysia. We report here two separate cases of beef taeniasis, and an interesting case of neurocysticercosis in a Malay Muslim. The taeniasis cases involved a Malaysian Chinese and a native Sabahan. Proglottids were recovered from them, and identification of the tapeworm done either from the microscopic examination of the egg or using PCR-based molecular diagnosis. Upon confirmation of taeniasis, both cases were given praziquantel and had been asymptomatic since. The neurocysticercosis case involving a Muslim who presented with seizure, was confirmed by histopathological examination of tissue sections taken from craniotomy excision of the brain lesion. He was given one month course of albendazole 400 mg bid and dexamethasone, and had been well and seizure free since. The two cases of taeniasis documented here had acquired the disease through eating raw or undercooked contaminated beef. For the neurocyticercosis case, it is suspected that he might have acquired the infection in one of his travels through human to human transmission via contaminated food or water consumption, given that Malaysia is not T. solium endemic area. Lastly praziquantel is an effective drug for beef taeniasis, while a combination of albendazole and dexamethasone work well for neurocysticercosis.
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Affiliation(s)
- T H Chua
- Department of Pathobiology and Medical Diagnostics, Faculty of Medicine and Health Sciences, Universiti Malaysia Sabah, Kota Kinabalu, Sabah, Malaysia
| | - J Emmanuel
- Queen Elizabeth Hospital, Kota Kinabalu, Sabah, Malaysia
| | - K T Lee
- Queen Elizabeth Hospital, Kota Kinabalu, Sabah, Malaysia
| | - F K Kan
- Department of Medicine, Hospital Sultanah Aminah, Johor Bahru, Johor, Malaysia
| | - K S Tee
- Department of Medicine, Hospital Sultanah Aminah, Johor Bahru, Johor, Malaysia
| | - Z Abidin
- Department of Medicine, Hospital Sultanah Aminah, Johor Bahru, Johor, Malaysia
| | - R Ganeswrie
- Department of Pathology, Hospital Sultanah Aminah, Johor Bahru, Johor, Malaysia
| | - L H Tan
- Department of Medicine, Sunway Medical Centre, Petaling Jaya, Selangor, Malaysia
| | - E C Low
- Department of Medicine, Sunway Medical Centre, Petaling Jaya, Selangor, Malaysia
| | - Y A L Lim
- Department of Parasitology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - J Menon
- Queen Elizabeth Hospital, Kota Kinabalu, Sabah, Malaysia
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Yu SCH, Lee KT, Lau TWW, Wong GKC, Pang VKY, Chan KY. Intravenous C-Arm Conebeam CT Angiography following Long-Term Flow-Diverter Implantation: Technologic Evaluation and Preliminary Results. AJNR Am J Neuroradiol 2016; 37:481-6. [PMID: 26585252 DOI: 10.3174/ajnr.a4558] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 07/29/2015] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE A noninvasive investigation with high spatial resolution and without metal artifacts is necessary for long-term imaging follow-up after flow-diverter implantation. We aimed to evaluate the diagnostic value of conebeam CT angiography with intravenous contrast enhancement in the assessment of vascular status following implantation of the Pipeline Embolization Device and to analyze the preliminary results of vascular status following long-term Pipeline Embolization Device implantation. MATERIALS AND METHODS This was an ongoing prospective study of consecutive patients with intracranial aneurysms treated with the Pipeline Embolization Device. Patients with a modified Rankin Scale score of 4-5 were excluded. The median and interquartile range of the time interval of Pipeline Embolization Device implantation to conebeam CT angiography with intravenous contrast enhancement were 56.6 and 42.9-62.4 months, respectively. Conebeam CT angiography with intravenous contrast enhancement was performed with the patient fully conscious, by using a C-arm CT with a flat panel detector. RESULTS There were 34 patients and 34 vascular segments. In all 34 cases, contrast effect and image quality were good and not substantially different from those of intra-arterial conebeam CTA. Metal artifacts occurred in all 14 cases with coil masses; the Pipeline Embolization Device was obscured in 3 cases. In all 34 cases, there was no residual aneurysm, no vascular occlusion, 1 vascular stenosis (50%), good Pipeline Embolization Device apposition to the vessel, and no Pipeline Embolization Device-induced calcification. All 28 Pipeline Embolization Device-covered side branches were patent. CONCLUSIONS Conebeam CT angiography with intravenous contrast enhancement is potentially promising and useful for effective evaluation of the vascular status following intracranial flow diverters. The Pipeline Embolization Device for intracranial aneurysms is probably safe and promising for long-term placement, with favorable morphologic outcome and without delayed complications.
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Affiliation(s)
- S C H Yu
- From the Department of Imaging and Interventional Radiology (S.C.H.Y., K.T.L., T.W.W.L.)
| | - K T Lee
- From the Department of Imaging and Interventional Radiology (S.C.H.Y., K.T.L., T.W.W.L.)
| | - T W W Lau
- From the Department of Imaging and Interventional Radiology (S.C.H.Y., K.T.L., T.W.W.L.)
| | - G K C Wong
- Division of Neurosurgery (G.K.C.W.), Department of Surgery, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong SAR
| | - V K Y Pang
- Department of Neurosurgery (V.K.Y.P.), Pamela Youde Nethersole Eastern Hospital, Hong Kong, SAR
| | - K Y Chan
- Department of Neurosurgery (K.Y.C.), Kwong Wah Hospital, Yaumatei, Kowloon, Hong Kong, SAR
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Abstract
Meat pH is an important factor influencing meat quality traits in swine. This study evaluated a large number of genetic variants that covered all of the swine chromosomal regions. Approximately 68,000 single nucleotide polymorphisms (SNPs), found on Illumina Porcine SNP chips, were tested for associations with meat pH values. A genome-wide association study (GWAS) found that 19 SNPs on Sus scrofa chromosome 4 were significantly associated with pH. Two major candidate genomic regions were defined: a 1.08-Mb region (at nucleotide 30118313 to 31207050) contained 10 significant SNPs, based on an effect value of 5.0; and a 2.7-Mb genomic region (at nucleotide 73293076 to 76023681) contained 9 significant SNPs. Three putative genes--PKHD1L1, VCPIP1, and LOC102166532--were identified by GWAS near significant SNPs. These genes may account for variations in pH levels. Three pseudogenes and two non-coding RNAs were also detected by GWAS analysis. Estimations of expected and observed P values for pH revealed significant departures from the null hypothesis. A total of 9 haplotype blocks (HB) were constructed: HBs 1, 3, and 5 showed significant effects on pH24 and pH45, whereas an association was not confirmed between pH24 and HBs 4, 6, and 8. Findings from this study indicate that the three genes identified may influence pH of pig meat.
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Affiliation(s)
- H Y Chung
- Animal Genomics and Bioinformatics Division, National Institute of Animal Science, Suwon, Korea
| | - K T Lee
- Animal Genomics and Bioinformatics Division, National Institute of Animal Science, Suwon, Korea
| | - G W Jang
- Animal Genomics and Bioinformatics Division, National Institute of Animal Science, Suwon, Korea
| | - J G Choi
- Animal Genomics and Bioinformatics Division, National Institute of Animal Science, Suwon, Korea
| | - J G Hong
- Animal Genomics and Bioinformatics Division, National Institute of Animal Science, Suwon, Korea
| | - T H Kim
- Animal Genomics and Bioinformatics Division, National Institute of Animal Science, Suwon, Korea
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Cho ES, Lee KT, Choi JW, Jeon HJ, Lee SW, Cho YM, Kim TH. Novel SNPs in the growth arrest and DNA damage-inducible protein 45 alpha gene (GADD45A) associated with meat quality traits in Berkshire pigs. Genet Mol Res 2015; 14:8581-8. [PMID: 26345789 DOI: 10.4238/2015.july.31.6] [Citation(s) in RCA: 4] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
This study was conducted to evaluate the porcine gene GADD45A (growth arrest and DNA-damage-inducible protein 45 alpha) as a positional candidate controlling quantitative trait loci (QTL) for meat quality traits on chromosome 6 (SSC6). Four exons of the porcine GADD45A gene were defined from cDNA and BAC clone sequences. A total of 4 single nucleotide polymorphisms (SNPs) were identified in porcine GADD45A. The association of these SNPs (g.196A>G, g.392C>A, g.955T>C and g.3247A>T) with meat quality traits was evaluated in 678 Berkshire pigs. The genotype distribution of only one SNP (g.3247A>T) conformed to Hardy Weinberg equilibrium in the pig population analyzed in this study, and the other SNPs were not in Hardy-Weinberg equilibrium. All four SNPs were significantly associated with meat quality traits. Three SNPS (g.196A>G, g.392C>A, and g.955T>C) showed similar significant association patterns for drip loss, cooking loss, meat color (lightness; MC_L and yellowness; MC_B), shear force and water-holding capacity traits. By contrast, g.3247A>T had a different association pattern with other traits such as intramuscular fat content (IMF) and backfat thickness (BF), drip loss, MC_L, and moisture. These findings will provide useful information for genetic characterization or association studies in other pig populations. Additionally, these markers can potentially be applied in pig breeding programs to improve meat quality traits, including IMF and BF.
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Affiliation(s)
- E S Cho
- Animal Genomics and Bioinformatics Division, National Institute of Animal Science, Rural Development Administration, Suwon, Korea
| | - K T Lee
- Animal Genomics and Bioinformatics Division, National Institute of Animal Science, Rural Development Administration, Suwon, Korea
| | - J W Choi
- Animal Genomics and Bioinformatics Division, National Institute of Animal Science, Rural Development Administration, Suwon, Korea
| | - H J Jeon
- Animal Genomics and Bioinformatics Division, National Institute of Animal Science, Rural Development Administration, Suwon, Korea
| | - S W Lee
- Animal Genomics and Bioinformatics Division, National Institute of Animal Science, Rural Development Administration, Suwon, Korea
| | - Y M Cho
- Animal Genomics and Bioinformatics Division, National Institute of Animal Science, Rural Development Administration, Suwon, Korea
| | - T H Kim
- Animal Genomics and Bioinformatics Division, National Institute of Animal Science, Rural Development Administration, Suwon, Korea
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Lee JY, Lee KT, Lee JK, Lee KH, Jang KT, Heo JS, Choi SH, Kim YI, Rhee JC. Erratum: Farnesoid X receptor, overexpressed in pancreatic cancer with lymph node metastasis promotes cell migration and invasion. Br J Cancer 2014. [PMCID: PMC4264432 DOI: 10.1038/bjc.2014.449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Hour MJ, Lee KH, Chen TL, Lee KT, Zhao Y, Lee HZ. Molecular modelling, synthesis, cytotoxicity and anti-tumour mechanisms of 2-aryl-6-substituted quinazolinones as dual-targeted anti-cancer agents. Br J Pharmacol 2014; 169:1574-86. [PMID: 23638624 DOI: 10.1111/bph.12233] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 04/01/2013] [Accepted: 04/18/2013] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND AND PURPOSE Our previous study demonstrated that 6-(pyrrolidin-1-yl)-2-(3-methoxyphenyl)quinazolin-4-one (HMJ38) was a potent anti-tubulin agent. Here, HMJ38 was used as a lead compound to develop more potent anti-cancer agents and to examine the anti-cancer mechanisms. EXPERIMENTAL APPROACH Using computer-aided drug design, 2-aryl-6-substituted quinazolinones (MJ compounds) were designed and synthesized by introducing substituents at C-2 and C-6 positions of HMJ38. The cytotoxicity of MJ compounds towards human cancer cells was examined by Trypan blue exclusion assay. Microtubule distribution was visualized using TubulinTracker(TM) Green reagent. Protein expression of cell cycle regulators and JNK was assessed by Western blot analysis. KEY RESULTS Compounds MJ65-70 exhibited strong anti-proliferative effects towards melanoma M21, lung squamous carcinoma CH27, lung non-small carcinoma H460, hepatoma Hep3B and oral cancer HSC-3 cells, with one compund MJ66 (6-(pyrrolidin-1-yl)-2-(naphthalen-1-yl)quinazolin-4-one) highly active against M21 cells (IC50 about 0.033 μM). Treatment of CH27 or HSC-3 cells with MJ65-70 resulted in significant mitotic arrest accompanied by increasing multiple asters of microtubules. JNK protein expression was involved in the MJ65-70-induced CH27 and M21 cell death. Consistent with the cell cycle arrest at G2/M phase, marked increases in cyclin B1 and Bcl-2 phosphorylation were also observed, after treatment with MJ65-70. CONCLUSIONS AND IMPLICATION MJ65-70 are dual-targeted, tubulin- and JNK-binding, anti-cancer agents and induce cancer cell death through up-regulation of JNK and interfering in the dynamics of tubulin. Our work provides a new strategy and mechanism for developing dual-targeted anti-cancer drugs, contributing to clinical anti-cancer drug discovery and application.
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Affiliation(s)
- M J Hour
- School of Pharmacy, China Medical University, Taichung, Taiwan.
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15
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Choi BH, Lee KT, Lee HJ, Jang GW, Lee HY, Cho BW, Han JY, Kim TH. Detection of quantitative trait Loci affecting fat deposition traits in pigs. Asian-Australas J Anim Sci 2014; 25:1507-10. [PMID: 25049509 PMCID: PMC4093036 DOI: 10.5713/ajas.2012.12116] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2012] [Revised: 05/11/2012] [Accepted: 04/20/2012] [Indexed: 11/27/2022]
Abstract
Quantitative trait loci (QTL) associated with fat deposition traits in pigs are important gene positions in a chromosome that influence meat quality of pork. For QTL study, a three generation resource population was constructed from a cross between Korean native boars and Landrace sows. A total of 240 F2 animals from intercross of F1 were produced. 80 microsatellite markers covering chromosomes 1 to 10 were selected to genotype the resource population. Intervals between adjacent markers were approximately 19 cM. Linkage analysis was performed using CRIMAP software version 2.4 with a FIXED option to obtain the map distances. For QTL analysis, the public web-based software, QTL express (http://www.qtl.cap.ed.ac.uk) was used. Two significant and two suggestive QTL were identified on SSC 6, 7, and 8 as affecting body fat and IMF traits. For QTL affecting IMF, the most significant association was detected between marker sw71 and sw1881 on SSC 6, and a suggestive QTL was identified between sw268 and sw205 on SSC8. These QTL accounted for 26.58% and 12.31% of the phenotypic variance, respectively. A significant QTL affecting IMF was detected at position 105 cM between markers sw71 and sw1881 on SSC 6.
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Affiliation(s)
- B H Choi
- Pusan National University, Miryang 627-706, Gyeongnam, Korea
| | - K T Lee
- Pusan National University, Miryang 627-706, Gyeongnam, Korea
| | - H J Lee
- Pusan National University, Miryang 627-706, Gyeongnam, Korea
| | - G W Jang
- Pusan National University, Miryang 627-706, Gyeongnam, Korea
| | - H Y Lee
- Pusan National University, Miryang 627-706, Gyeongnam, Korea
| | - B W Cho
- Pusan National University, Miryang 627-706, Gyeongnam, Korea
| | - J Y Han
- Seoul National University, Seoul 151-742, Korea
| | - T H Kim
- Pusan National University, Miryang 627-706, Gyeongnam, Korea
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16
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Kollipara PS, Kim JH, Won D, Lee SM, Sung HC, Chang HS, Lee KT, Lee KS, Park MH, Song MJ, Song HS, Hong JT. Co-culture with NK-92MI cells enhanced the anti-cancer effect of bee venom on NSCLC cells by inactivation of NF-κB. Arch Pharm Res 2014; 37:379-89. [PMID: 24379113 DOI: 10.1007/s12272-013-0319-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Accepted: 12/18/2013] [Indexed: 10/25/2022]
Abstract
In the present study we experimented on a multimodal therapeutic approach, such as combining chemotherapy agent (Bee venom) with cellular (NK-92MI) immunotherapy. Previously bee venom has been found to show anti-cancer effect in various cancer cell lines. In lung cancer cells bee venom showed an IC(50) value of 3 μg/ml in both cell lines. The co-culture of NK-92MI cell lines with lung cancer cells also show a decrease in viability upto 50 % at 48 h time point. Hence we used bee venom treated NK-92MI cells to co-culture with NSCLC cells and found that there is a further decrease in cell viability upto 70 and 75 % in A549 and NCI-H460 cell lines respectively. We further investigated the expression of various apoptotic and anti-apoptotic proteins and found that Bax, cleaved caspase-3 and -8 were increasing where as Bcl-2 and cIAP-2 was decreasing. The expression of various death receptor proteins like DR3, DR6 and Fas was also increasing. Concomitantly the expression of various death receptor ligands (TNFalpha, Apo3L and FasL) was also increasing of NK-92MI cells after co-culture. Further the DNA binding activity and luciferase activity of NF-κB was also inhibited after co-culture with bee venom treated NK-92MI cell lines. The knock down of death receptors with si-RNA has reversed the decrease in cell viability and NF-κB activity after co-culture with bee venom treated NK-92MI cells. Thus this new approach can enhance the anti-cancer effect of bee venom at a much lower concentration.
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Affiliation(s)
- Pushpa Saranya Kollipara
- College of Pharmacy and Medical Research Center, Chungbuk National University, 12 Gaesin-dong, Heungduk-gu, Ch'ongju, Chungbuk, 361-763, Korea
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17
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Wong EHC, Yu SCH, Lau AYL, Hui VSW, Leung CSF, Hui JWY, Siu DYW, Abrigo JM, Lee KT, Graham CA, Wong LKS, Leung TWH. Intra-arterial revascularisation therapy for acute ischaemic stroke: initial experience in a Hong Kong hospital. Hong Kong Med J 2013; 19:135-141. [PMID: 23535673] [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: 06/02/2023] Open
Abstract
OBJECTIVES To assess the outcome of acute ischaemic stroke patients who received intra-arterial therapy in our unit. DESIGN Case series. SETTING A tertiary hospital in Hong Kong. PATIENTS Patients with ischaemic stroke due to large artery occlusion treated within 6 hours from symptom onset between January 2007 and May 2011. INTERVENTION Acute intra-arterial revascularisation therapy. MAIN OUTCOME MEASURES Primary outcome was functional independence (modified Rankin Scale score of ≤ 2) at 3 months. Secondary outcome was rate of recanalisation. Safety outcomes were symptomatic intracranial haemorrhage and 3-month mortality. RESULTS Twenty-one patients with a mean age of 67 years fulfilled the inclusion criteria. Their mean National Institutes of Health Stroke Scale score was 18. The mean onset-to-puncture time was 212 minutes. Nine received intra-arterial tissue plasminogen activator alone, 11 had an adjunctive mechanical thrombectomy, and one received balloon angioplasty without tissue plasminogen activator. At the end of the procedure, thrombolysis grade 2a or better was attained in 18 (86%) of the patients, and 8 (38%) achieved functional independence at 3 months. Rates of symptomatic intracranial haemorrhage and 3-month mortality were 10% and 24%, respectively. CONCLUSION In this setting, intra-arterial revascularisation therapy appeared safe and efficacious for this selected group of ischaemic stroke patients with large artery occlusions. Experience gained from this pilot study may help improve clinical outcomes of such patients.
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Affiliation(s)
- Edward H C Wong
- Department of Medicine and Therapeutics, Prince of Wales Hospital, Shatin, Hong Kong.
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Yeon SH, Lee SH, Choi BH, Lee HJ, Jang GW, Lee KT, Kim KH, Lee JH, Chung HY. Genetic variation of FASN is associated with fatty acid composition of Hanwoo. Meat Sci 2013; 94:133-8. [PMID: 23403305 DOI: 10.1016/j.meatsci.2013.01.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2012] [Revised: 12/31/2012] [Accepted: 01/02/2013] [Indexed: 10/27/2022]
Abstract
The objective of this study was to identify genetic variants in the bovine fatty acid synthase (FASN) gene and to evaluate associations with fatty acid composition from longissimus lumborum muscle using 90 purebred Hanwoo steers. Sequence alignments observed 6 genetic variants located in exons 20, 24, 32, 34, and 39, and PCR-RFLP analysis confirmed these variations. Genotypes of the g.15532A>C locus were significantly associated with Linolenic acid (C18:3), and genotypes of the g.17924G>A locus were significantly associated with Palmitic (C16:0), Palmitoleic (C16:1), Oleic (C18:1), saturated fatty acids, and unsaturated fatty acids. The analysis revealed that SFA and UFA showed significant correlations with fatty acid composition (Myristic (C14:0), Palmitic (C16:0), Stearic (C18:0), Oleic (C18:1), and Eicosenoic (C20:1) acids). Oleic acid (C18:1) was negatively correlated with Myristic (C14:0), Palmitic (C16:0), and Palmitoleic (C16:1) acids (P<0.001).
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Affiliation(s)
- S H Yeon
- National Institute of Animal Science, Pyeongchang, Republic of Korea
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19
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Ofori-Boateng C, Lee KT. Response surface optimization of ultrasonic-assisted extraction of carotenoids from oil palm ( Elaeis guineensis Jacq.) fronds. Food Sci Nutr 2013; 1:209-221. [PMID: 29387349 PMCID: PMC5779322 DOI: 10.1002/fsn3.22] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [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: 09/30/2012] [Revised: 12/04/2012] [Accepted: 12/07/2012] [Indexed: 11/06/2022] Open
Abstract
Oil palm (Elaeis guineensis Jacq.) fronds (OPF) are the most abundant oil palm solid wastes that are generated during oil palm agriculture and harvest. Palm oil and some other palm wastes have been reported to contain high concentrations of carotenoids with vital bioactive properties. However, the extraction and quantification of carotenoids from OPF have not been reported. In this study, ultrasonic-assisted extraction, HPLC-FLD for quantification, and response surface methodology (RSM) for optimization of β-carotene, lutein, and zeaxanthin from OPF extracts were investigated. The effects of extraction temperature (X1: 30-70°C), extraction time (X2: 10-50 min), and solvent-sample ratio (X3: 10-50 mL/g) on the recovery of β-carotene (Y1), lutein (Y2), and zeaxanthin (Y3) were investigated using three-level Box-Behnken design (BBD) experiment. At a desirability of 1, the optimum extraction conditions for β-carotene (30.14°C, 37.11 min, and 23.18 mL/g), lutein (30.00°C, 39.09 min, and 19.24 mL/g), and zeaxanthin (30.09°C, 36.76 min, and 22.38 mL/g) yielded carotenoid concentrations of 17.95 μg/g dry weight (DW), 261.99 μg/g DW, and 29.99 μg/g DW, respectively.
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Affiliation(s)
- C Ofori-Boateng
- Lignocellulosic Research Group School of Chemical Engineering Universiti Sains Malaysia 14300 Nibong Tebal Pulau Pinang Malaysia
| | - K T Lee
- Lignocellulosic Research Group School of Chemical Engineering Universiti Sains Malaysia 14300 Nibong Tebal Pulau Pinang Malaysia
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20
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Lee KT, Kim BJ, Kim JH, Heo MY, Kim HP. Biological screening of 100 plant extracts for cosmetic use (I): inhibitory activities of tyrosinase and DOPA auto-oxidation. Int J Cosmet Sci 2012; 19:291-8. [PMID: 18505483 DOI: 10.1046/j.1467-2494.1997.171725.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The aim of this study was to evaluate several plant extracts with a view to developing melanogenesis inhibitors. In this study, 100 plant extracts were screened to elucidate their whitening effects using in vitro inhibition of tyrosinase and DOPA auto-oxidation activity. Several plant extracts such as Chaenomeles speciosa, Dryopteris crassirhizoma, Gastrodia ellata, Glycyrrhiza glabra, Morus alba, Myristica fragrans, Rheum palmatum and Sophora japonica showed inhibition of mushroom tyrosinase activity. Plant extracts including Bupleurum falcatum, Caragana sinica, Morus alba and Tussilago farfara showed inhibition of DOPA auto-oxidation activity.
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Affiliation(s)
- K T Lee
- College of Pharmacy, Kangwon National University, Chuncheon, Korea
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21
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Wu KL, Tsui KL, Lee KT, Chau CH, Chan HL, Cheung SH, Cheung CY, Choi MC, Chan KK, Li SK. Reperfusion strategy for ST-segment elevation myocardial infarction: trend over a 10-year period. Hong Kong Med J 2012; 18:276-283. [PMID: 22865170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023] Open
Abstract
OBJECTIVES. To review the 10-year trend of reperfusion strategies in patients with ST-segment elevation myocardial infarction, and the adoption rate of percutaneous coronary interventions as opposed to thrombolytic therapy. Also to explore why some patients did not receive reperfusion therapy, and document changes in reperfusion strategies after the introduction of primary percutaneous coronary intervention programmes. DESIGN. Case series. SETTING. A regional hospital, Hong Kong. PATIENTS. All patients with ST-segment elevation myocardial infarction from January 2000 to December 2009. RESULTS. There were 1835 patients with ST-segment elevation myocardial infarction in that period, of which 1179 (64.3%) received reperfusion therapy (thrombolytic therapy, 46.0%; primary percutaneous coronary intervention, 17.5%; emergency coronary artery bypass graft, 0.7%). After introduction of the primary percutaneous coronary intervention programme, significantly more ST-segment elevation myocardial infarction cases underwent that particular intervention (1.6% in 2000 increasing to 30.6% in 2009), while the proportion receiving thrombolytic therapy declined (57.4% in 2000 decreasing to 35.0% in 2009). Seven reasons for no reperfusion therapy were identified. The commonest ones were delayed presentation (45.1%), succumbed before reperfusion (16.0%), multiple medical co-morbidities (15.2%), and contra-indication to thrombolytic therapy (14.8%). The proportion without reperfusion therapy due to a contra-indication to thrombolytic therapy declined (22.7% in 2000 decreasing to 4.9% to 2009), whilst an increasing proportion received primary percutaneous coronary interventions. CONCLUSIONS. Primary percutaneous coronary intervention is increasingly used as the reperfusion therapy in ST-segment elevation myocardial infarction and is replacing thrombolytic therapy, though the latter still remains a mainstay of therapy. A significant proportion of ST-segment elevation myocardial infarction cases received no reperfusion due to various reasons.
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Affiliation(s)
- K L Wu
- Department of Medicine, Pamela Youde Nethersole Eastern Hospital, Chai Wan, Hong Kong.
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22
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Lee KT, Byun MJ, Kang KS, Hwang H, Park EW, Kim JM, Kim TH, Lee SH. Single nucleotide polymorphism association study for backfat and intramuscular fat content in the region between SW2098 and SW1881 on pig chromosome 6. J Anim Sci 2011; 90:1081-7. [PMID: 21984723 DOI: 10.2527/jas.2011-4228] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
This study was carried out to identify SNP associated with fatness traits on pig chromosome 6. In total, 11,067 putative genomic variations were detected in 125 complete bacterial artificial chromosome sequences corresponding to the region between SW2098 and SW1881, which harbors multiple QTL affecting intramuscular fat content (IMF) and backfat thickness (BFT). Among 173 putative SNP validated by MassArray, 120 SNP were used in an association study on 541 offspring produced by a cross of Korean native pig and Landrace breeds. The significance level of each SNP was determined using single marker regression analysis. Further, significant threshold values were determined using a false discovery rate. Nine out of 120 SNP showed significant effects on BFT or IMF or both. Of the 9 significant SNP, 4 were significantly associated with IMF, 7 were significantly related to BFT, and 2 SNP (Kps8172 and Kps6413) showed significant effects on both traits. Moreover, multiple regression analysis considering all significant SNP was used to correct spurious false positives due to linkage disequilibrium. Consequently, only 1 SNP (Kps6413) was significant for IMF, whereas 4 SNP including Kps6413 showed significant effects on BFT. The significant SNP had generally additive effects and on average explained 1.72% of the genetic variation for IMF and 3.92% for BFT, respectively. These markers can potentially be applied in pig breeding programs for improving IMF and BFT traits after validation in other populations.
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Affiliation(s)
- K T Lee
- Animal Genomics and Bioinformatics Division, National Institute of Animal Science, Rural Development Administration, Gwonsun-gu, Suwon, Korea 441-706
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Kim JM, Lee KT, Lim KS, Park EW, Lee YS, Hong KC. Effects of p.C430S polymorphism in the PPARGC1A gene on muscle fibre type composition and meat quality in Yorkshire pigs. Anim Genet 2011; 41:642-5. [PMID: 20412126 DOI: 10.1111/j.1365-2052.2010.02042.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The peroxisome proliferator-activated receptor-gamma coactivator-1A (encoded by PPARGC1A) is involved in the formation of type I fibres. Therefore, the PPARGC1A gene can be considered as a functional candidate gene for muscle fibre type composition and meat quality in pigs. The aim of this study was to investigate the associations of the p.C430S polymorphic site in exon 8 of the PPARGC1A gene with muscle fibre characteristics and meat quality traits. The polymorphism was genotyped by PCR-RFLP using AluI restriction enzyme on a total of 152 Yorkshire pigs. Statistical analyses revealed that the p.C430S genotypes significantly affected number (P < 0.05) and area (P < 0.01) of type I muscle fibre, and were significantly associated with muscle pH (P < 0.001) and lightness(P < 0.01). On the basis of these results, we suggest that the p.C430S polymorphism can induce variation of type I fibre formation in porcine longissimus dorsi muscle and that it can be used as a meaningful molecular marker for better meat quality.
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Affiliation(s)
- J M Kim
- Division of Biotechnology, College of Life Sciences and Biotechnology, Korea University, 5-1 Anam-dong, Sungbuk-gu, Seoul, South Korea
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Yu SCH, Leung TWH, Lee KT, Hui JWY, Wong LKS. Angioplasty and stenting of atherosclerotic middle cerebral arteries with Wingspan: evaluation of clinical outcome, restenosis, and procedure outcome. AJNR Am J Neuroradiol 2011; 32:753-8. [PMID: 21436335 DOI: 10.3174/ajnr.a2363] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [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: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE MCA is a common location of intracranial stenosis. It is relatively more peripherally located and of a smaller caliber, and could therefore be a site technically more challenging and risky for angioplasty and stenting. The study aimed to evaluate the clinical outcome, restenosis rate, and procedural safety of Wingspan stent placement for atherosclerosis in the MCA compared with stenosis in other arteries. MATERIALS AND METHODS Patients who underwent Wingspan stent placement for symptomatic intracranial stenosis of ≥70% (or stenosis of ≥50% for recurrent ischemia despite medical therapy) were recruited prospectively and allocated into a study group (MCA stenosis, n=35) and a control group (other stenosis, n=25). Primary end points were the following: 1) all stroke or death rate at 1 year, and 2) significant in-stent restenosis rate at 1 year. Secondary end points were the following: 1) periprocedural complications within 24 hours, rate of TIA during the procedure, all stroke or death rate within 30 days; and 2) the inability to complete the procedure due to technical problems. RESULTS Results of study group versus the control group were the following: degree of stenosis, 78.4 ± 10.9% versus 72.5 ± 11.2% (P value=.0456); diameter of stenosis, 0.6 ± 0.3 versus 1.0 ± 0.5 mm (P=.0017); all stroke or death rate at 1 year, 14.3% versus 12% (OR=1.22); in-stent restenosis rate at 1 year, 10% versus 10.5% (OR=1.05); periprocedural complication rate at 24 hours, 2.9% versus 4% (OR=0.70); TIA rate during the procedure, 8.6% versus 4% (OR=2.25); all stroke or death rate at 30 days, 5.7% versus 12% (OR=0.44); and technical failure rate, 2.9% versus 0%. CONCLUSIONS In this study, there were no significant differences in procedural safety, patient outcome, and restenosis rates of stent placement between the group with MCA stenosis and the group with stenoses located at other sites.
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Affiliation(s)
- S C H Yu
- Department of Imaging and Interventional Radiology, Prince of Wales Hospital, The Chinese University of Hong Kong, 30-32 Ngan Shing St, Shatin, Hong Kong, China.
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25
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Hew KL, Tamidi AM, Yusup S, Lee KT, Ahmad MM. Catalytic cracking of bio-oil to organic liquid product (OLP). Bioresour Technol 2010; 101:8855-8858. [PMID: 20621470 DOI: 10.1016/j.biortech.2010.05.036] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2010] [Revised: 05/11/2010] [Accepted: 05/17/2010] [Indexed: 05/29/2023]
Abstract
The main objective of this paper is to find the optimum operating condition to upgrade the EFB-derived pyrolysis oil (bio-oil) to liquid fuel, mainly gasoline using Taguchi Method. From the analysis that has been done, it is found that the optimum operating condition for heterogeneous catalytic cracking process is at 400 degrees C, 15min of reaction time using 30g of catalyst weight where operating at this condition produced the highest yield of gasoline fraction which is 91.67 wt.%. This observation proves that EFB-derived pyrolysis oil could be upgraded via heterogeneous catalytic cracking to produce gasoline.
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Affiliation(s)
- K L Hew
- Chemical Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Tronoh, Perak, Malaysia
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26
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Sumathi S, Bhatia S, Lee KT, Mohamed AR. Selection of best impregnated palm shell activated carbon (PSAC) for simultaneous removal of SO2 and NOx. J Hazard Mater 2010; 176:1093-6. [PMID: 20018447 DOI: 10.1016/j.jhazmat.2009.11.037] [Citation(s) in RCA: 27] [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] [Subscribe] [Scholar Register] [Received: 09/29/2009] [Revised: 11/05/2009] [Accepted: 11/05/2009] [Indexed: 05/20/2023]
Abstract
This work examines the impregnated carbon-based sorbents for simultaneous removal of SO(2) and NOx from simulated flue gas. The carbon-based sorbents were prepared using palm shell activated carbon (PSAC) impregnated with several metal oxides (Ni, V, Fe and Ce). The removal of SO(2) and NOx from the simulated flue gas was investigated in a fixed-bed reactor. The results showed that PSAC impregnated with CeO(2) (PSAC-Ce) reported the highest sorption capacity among other impregnated metal oxides for the simultaneous removal of SO(2) and NOx. PSAC-Ce showed the longest breakthrough time of 165 and 115 min for SO(2) and NOx, respectively. The properties of the pure and impregnated PSAC were analyzed by BET, FTIR and XRF. The physical-chemical features of the PSAC-Ce sorbent indicated a catalytic activity in both the sorption of SO(2) and NOx. The formation of both sulfate (SO(4)(2-)) and nitrate (NO(3-)) species on spent PSAC-Ce further prove the catalytic role played by CeO(2).
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Affiliation(s)
- S Sumathi
- School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, Seri Ampangan, 14300 Nibong Tebal, Pulau Pinang, Malaysia
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27
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Ng CH, Lee KT, Taib NA, Yip CH. Experience with hookwire localisation excision biopsy at a medical centre in Malaysia. Singapore Med J 2010; 51:306-310. [PMID: 20505908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
INTRODUCTION With an increasing number of women undergoing breast screening, an effective method of removing non-palpable lumps detected by mammography or sonography is by hookwire localisation excision biopsy (HWLB). The aim of this paper was to audit the practice of HWLB at the University Malaya Medical Centre. METHODS Patients with benign or suspicious preoperative diagnoses of a non-palpable lump and who underwent HWLB were included in this study. Pathological examination of the surgical specimens was conducted and a correlation with preoperative assessment modalities was reported. RESULTS A total of 59 HWLBs were carried out in 57 female patients. The mean age of the patients was 51.5 years. The overall malignancy rate was 32.3 percent (19 out of 59 cases) with a benign to malignant ratio of 3.1 to 1. Ten of these cases were ductal carcinoma-in-situ. Out of 25 patients who were suspicious on preoperative assessment, 16 malignancies were found, while in the 33 patients thought to be benign on preoperative assessment, there were three malignancies, giving a sensitivity of 84.2 percent and a specificity of 76.9 percent (p is less than 0.05). The mean tissue volume excised in 53 available records was 50.0 cm(3), with pathological tissue comprising only 15.4 percent of the total excised volume. Clear margins were obtained in 42.1 percent of the patients. The overall operative complication rate was 10.2 percent. CONCLUSION Malignancy was reported in one third of women undergoing HWLB, of which 16 had suspicious features on radiological assessment and/or fine needle aspiration cytology/core needle biopsy preoperatively. Non-palpable lumps should be excised by HWLB for a definitive diagnosis in case of any suspicion on preoperative assessment, as the prognosis is excellent.
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Affiliation(s)
- C H Ng
- Division of Surgery, Clinical School, International Medical University, Jalan Rasah, Seremban 70300, Malaysia.
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Park K, Dirisala VR, Oh Y, Choi H, Lee KT, Kim JH, Lee HT, Seo KH, Park C. Reporting 678 putative cSNPs from full-length enriched cDNA sequences of the Korean native pig. J Anim Breed Genet 2009; 126:127-33. [PMID: 19320769 DOI: 10.1111/j.1439-0388.2008.00765.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Sequences from the clones of full-length enriched cDNA libraries serve as valuable resources for functional genomic studies. We have analysed 1970 high-quality chromatograms (Phred value >or= 30) that were obtained from sequencing the 5' ends of brainstem, liver, neocortex and spleen clones derived from full-length enriched cDNA libraries from Korean native pigs. In addition, 50,000 pig expressed sequence tag (EST) sequence trace files were obtained from Genbank and combined with our sequencing information to facilitate SNP identification in silico. The process generated 8118 contigs, of which 239 included minimum one sequence from Korean native pig and contained 678 putative coding single nucleotide polymorphisms (cSNPs). Of these, 33 putative cSNPs were randomly selected for confirmatory analysis and validated using 20 pigs from four different breeds (Duroc, Landrace, Yorkshire, Korean native pig). Of the 33 putative cSNPs, 20 were confirmed (61%), which was similar to the frequency reported in other studies. We also identified 15 new cSNPs from the validation process, which were not detected by our in silico analysis. Our study shows that analysing genetically diverse pig breeds including the Korean native pig could serve as a useful strategy for generating a large number of cSNPs.
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Affiliation(s)
- K Park
- Department of Animal Biotechnology, Konkuk University, Seoul, Republic of Korea
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Kim BJ, Lee KT, Moon TG, Kang P, Lee JK, Kim JJ, Rhee JC. How do we interpret an elevated carbohydrate antigen 19-9 level in asymptomatic subjects? Dig Liver Dis 2009; 41:364-9. [PMID: 19162573 DOI: 10.1016/j.dld.2008.12.094] [Citation(s) in RCA: 26] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2008] [Revised: 11/25/2008] [Accepted: 12/03/2008] [Indexed: 12/11/2022]
Abstract
AIM This prospective cohort study aimed to evaluate the etiology of elevated CA 19-9 levels and to present appropriate guidelines for the asymptomatic patients. METHODS Between January 2004 and March 2007, we enrolled consecutive asymptomatic patients who had elevated CA 19-9 levels >37 U/mL. To evaluate the etiology, the CA 19-9 level was rechecked and further studies were carried out. If the CA 19-9 level decreased to the normal range, or if it showed a decreasing trend, then it was monitored annually. Yet, if the CA 19-9 level showed an increasing trend, then the level was monitored at intervals of 1, 3, and 6 months until no evidence of malignancy was proven. RESULTS Of the 62,976 patients, 501 (0.8%) subjects showed an elevated CA 19-9 level. This prospective analysis was conducted on 353 subjects (70.5%) who were followed up for at least 6 months. Ten patients (2.8%) were diagnosed with malignancies. There were 97 patients (27.5%) with benign diseases and 246 patients (69.7%) were deemed non-specific. CONCLUSIONS CA 19-9 should not be used as a screening tool. In the case of a persistently elevated CA 19-9 level, further work-up for determining the etiology should be done.
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Affiliation(s)
- B J Kim
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Republic of Korea
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Sumathi S, Bhatia S, Lee KT, Mohamed AR. Optimization of microporous palm shell activated carbon production for flue gas desulphurization: experimental and statistical studies. Bioresour Technol 2009; 100:1614-1621. [PMID: 18952414 DOI: 10.1016/j.biortech.2008.09.020] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2008] [Revised: 09/05/2008] [Accepted: 09/05/2008] [Indexed: 05/27/2023]
Abstract
Optimizing the production of microporous activated carbon from waste palm shell was done by applying experimental design methodology. The product, palm shell activated carbon was tested for removal of SO2 gas from flue gas. The activated carbon production was mathematically described as a function of parameters such as flow rate, activation time and activation temperature of carbonization. These parameters were modeled using response surface methodology. The experiments were carried out as a central composite design consisting of 32 experiments. Quadratic models were developed for surface area, total pore volume, and microporosity in term of micropore fraction. The models were used to obtain the optimum process condition for the production of microporous palm shell activated carbon useful for SO2 removal. The optimized palm shell activated carbon with surface area of 973 m(2)/g, total pore volume of 0.78 cc/g and micropore fraction of 70.5% showed an excellent agreement with the amount predicted by the statistical analysis. Palm shell activated carbon with higher surface area and microporosity fraction showed good adsorption affinity for SO2 removal.
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Affiliation(s)
- S Sumathi
- School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia
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Mun KC, Lee KT, Choi HJ, Jin KB, Han SY, Park SB, Kim HC, Ha EY, Kim YH. Effects of cyclosporine on the production of the reactive oxygen species in the glial cells. Transplant Proc 2008; 40:2742-3. [PMID: 18929851 DOI: 10.1016/j.transproceed.2008.08.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [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]
Abstract
OBJECTIVES After organ transplantation, some patients suffer mild neurological symptoms such as tremor to severe complications including seizures and encephalopathy. Among the immunosuppressants, cyclosporine (CsA) can induce neurological side effects. However, the mechanisms of encephalopathy by CsA are not fully understood. We measured the production of reactive oxygen species (ROS) in the glioma cells after CsA treatment. METHODS CsA (2.5 mmol/L) added to glioma cells was incubated for 60 minutes at 37 degrees C. ROS production was evaluated by measuring the fluorescent product from the oxidation of an oxidant-sensitive 2',7'-dichlorofluorescin using VICTOR3 multilabel counter. RESULTS CsA resulted in ROS production by glioma cells. The ROS production increased with the time of exposure to CsA. CONCLUSIONS These findings indicated that CsA may contribute to neurological side effects via ROS production.
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Affiliation(s)
- K C Mun
- Dongsan Kidney Institute and Chronic Disease Research Center, Keimyung University, Daegu, Korea.
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Kim TH, Kim KS, Choi BH, Yoon DH, Jang GW, Lee KT, Chung HY, Lee HY, Park HS, Lee JW. Genetic structure of pig breeds from Korea and China using microsatellite loci analysis. J Anim Sci 2008; 83:2255-63. [PMID: 16160034 DOI: 10.2527/2005.83102255x] [Citation(s) in RCA: 73] [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: 11/13/2022] Open
Abstract
To understand molecular genetic characteristics of Korean pigs, the genetic relationships of nine pig breeds including two Korean pigs (Korean native pig and Korean wild pig), three Chinese pigs (Min pig, Xiang pig, and Wuzhishan pig), and four European breeds (Berkshire, Duroc, Landrace, and Yorkshire) were characterized from a 16-microsatellite loci analysis. The mean heterozygosity within breeds ranged from 0.494 to 0.703. Across multiple loci, significant deviation from Hardy-Weinberg equilibrium was observed in most pig breeds, except for two Chinese pigs (Min pig and Wuzhishan pig). This deviation was in the direction of heterozygote deficit. Across population loci, 36 of 144 significantly deviated (P < 0.05) from Hardy-Weinberg equilibrium. The mean FST, a measure of genetic divergence among subpopulations, of all loci indicated that 26.1% of total variation could be attributed to the breed difference. Relationship trees based on the Nei's DA genetic distance and scatter diagram from principal component analysis consistently displayed pronounced genetic differentiation among the Korean wild pig, Xiang pig, and Wuzhishan pig. Individual assignment test using a Bayesian method showed 100% success in assigning Korean and Chinese individual pigs into their correct breeds of origin and 100% exclusion success from all alternative reference populations at P < 0.001. These findings indicate that the Korean native pig has been experiencing progressive interbreeding with Western pig breeds after originating from a North China pig breed with a black coat color. Considering the close genetic relationship of Korean pigs to the Western breeds such as Berkshire and Landrace, our findings can be used as valuable genetic information for the preservation and further genetic improvement of the Korean native pig.
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Affiliation(s)
- T H Kim
- Animal Genomics and Bioinformatics Division, National Livestock Research Institute, RDA, Suwon, Gyeonggi 441-706, Republic of Korea.
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Chung HY, Kim TH, Choi BH, Jang GW, Lee JW, Lee KT, Ha JM. Isolation and characterization of the bovine microsatellite loci. Biochem Genet 2007; 44:527-41. [PMID: 17139452 DOI: 10.1007/s10528-006-9055-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Microsatellite loci were isolated using five repetitive probes for Korean native cattle. Eleven microsatellite loci were developed based on a biotin hybrid capture method, and enrichment of the genomic libraries (AAAT, TG, AG, T, and TGC repeats) was performed using Sau3AI adapters. The isolated markers were tested in two half-sib Korean cattle families and four imported breeds (Angus, Limousine, Holstein, and Shorthorn). Nine informative microsatellite loci were observed, and two microsatellite loci were revealed as monomorphic in Korean cattle. In the imported breeds, however, all of the markers were informative. In total, 213 alleles were obtained at the 11 loci across five breeds, and the average number of alleles found per locus, considering all populations, was 4.26. Heterozygosity was 0.71 (expected) and 0.57 (observed). The range of the polymorphic information content for the markers in all cattle populations was 0.43-0.69. Eleven percent of genetic variation was attributed to differentiation between populations as determined by the mean F (ST) values. The remaining 89% corresponded to differences among individuals. The isolated markers may be used to identify and classify the local breeds on a molecular basis.
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Affiliation(s)
- H Y Chung
- Animal Genomics and Bioinformatics Division, National Livestock Research Institute, Suwon, Korea.
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Affiliation(s)
- H Y Chung
- Animal Genomics and Bioinformatics Division, National Livestock Research Institute, Suwon 441-701 Korea
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Park SB, Kwak JH, Lee KT, Hwang EA, Han SY, Kim HT, Cho WH, Choi MS, Kim HC. Polyoma virus-associated nephropathy and concurrent cytomegalovirus infection in the kidney transplant recipients. Transplant Proc 2006; 38:2059-61. [PMID: 16979999 DOI: 10.1016/j.transproceed.2006.06.107] [Citation(s) in RCA: 7] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
INTRODUCTION Cytomegalovirus (CMV) and polyoma virus BK (BKV) may both establish latency following primary infection. Frequent reactivation of these viruses can occur in the kidney transplant recipients. BKV may induce CMV gene expression by stimulating cellular regulator proteins or by its own gene regulator proteins. A high rate of concurrent CMV infections has been noted in kidney transplant recipients with polyoma virus-associated nephropathy (PVAN). METHODS PVAN was identified in 10 of 191 patients who received kidney transplants between October 1998 and September 2003. PVAN was confirmed by allograft kidney biopsy. Four of the 10 patients were complicated by concurrent CMV infection. RESULTS Two patients had only serological evidence of CMV infection and one patient had CMV gastritis. These three patients were treated with intravenous ganciclovir with good results. Disseminated ganciclovir-resistant CMV disease was demonstrated in the remaining patient. This 34-year-old kidney transplant recipient with PVAN died of multiorgan failure despite antiviral therapy with both ganciclovir and foscarnet. CONCLUSION PVAN with concurrent CMV infection in kidney transplant recipients showed variable clinical courses including mortality. Further studies are needed to elucidate the influence of PVAN on the pathogenesis of CMV infection.
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Affiliation(s)
- S B Park
- Department of Internal Medicine, Keimyung University School of Medicine, 194 Dong San Dong, Daegu 700-712, Korea.
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Chiu SSH, Lim JH, Lee WJ, Chang KT, Oh DK, Lee KT, Lee JK, Choi SH. Intraductal papillary mucinous tumour of the pancreas: differentiation of malignancy and benignancy by CT. Clin Radiol 2006; 61:776-83. [PMID: 16905386 DOI: 10.1016/j.crad.2006.04.008] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2006] [Revised: 04/07/2006] [Accepted: 04/24/2006] [Indexed: 11/18/2022]
Abstract
AIM To retrospectively identify signs predictive of malignant intraductal papillary mucinous tumour (IPMT) of the pancreas on computed tomography (CT) images. MATERIALS AND METHODS Thirty-four benign and 21 malignant pancreatic IPMTs were evaluated. Preoperative helical CT images in these 55 cases of pathologically proven pancreatic IPMT were reviewed by two radiologists unaware of the histological grading. Tumour morphological types, locations, numbers and sizes of cystic lesions, maximum main pancreatic duct diameters, the presence of septa, mural nodule, wall thickening, and calcification in cysts, communication with the main pancreatic duct, peripancreatic haziness, protrusion of duodenal papilla, pancreatic atrophy, lymphadenopathy and distant metastasis were analysed using univariate and multivariate analysis. RESULTS Main duct IPMTs were more likely to be malignant (71%) than branch duct (23%) or combined type IPMTs (28%; p=0.002). Among the branch duct type and combined types, large cystic lesion (p=0.018), the presence of a mural nodule (p=0.018), a thickened wall (p=0.009), and peripancreatic haziness (p=0.039) were found to predict malignancy. CONCLUSION CT is helpful in the preoperative differentiation of malignant and benign pancreatic IPMT. The presence of a dilated main pancreatic duct, mural nodules, thickened wall and peripancreatic haziness may be used as independent predictive signs of malignancy.
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Affiliation(s)
- S S-h Chiu
- Department of Radiology and Center for Imaging Science, Sungkyunkwan University School of Medicine, Seoul, Korea
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Abstract
BACKGROUND Gallstone disease has been regarded as an obesity-related disease. Therefore, we hypothesized that leptin and adiponectin, mainly produced by adipose tissue, may play roles in gallstone disease. PATIENTS AND METHODS The RIA method was used to analyze serum leptin and adiponectin levels of 90 gallstone patients and 91 healthy subjects. RESULTS Our results showed that BMI, fasting glucose, serum AST and ALT, and leptin were significantly increased in the gallstone patients as compared with the healthy subjects (P < 0.001, P < 0.001, P < 0.001, P < 0.001, P < 0.001, and P = 0.013, respectively). Intriguingly, serum adiponectin was the only variable to be significantly decreased in the gallstone patients (P = 0.002). Furthermore, serum AST, leptin, and adiponectin were significantly associated with gallstone disease (P < 0.001, P = 0.021, and P = 0.006, respectively). Overweight (BMI >or= 25 kg m(-2)), but not normal-weight, gallstone patients had an increased serum leptin and a decreased serum adiponectin level as compared with matched healthy subjects (P < 0.001 and P = 0.024, respectively). In addition, serum leptin was positively correlated with BMI and serum cholesterol, while serum adiponectin was inversely correlated with serum triglyceride in the gallstone patients. CONCLUSIONS Our study indicated that hyperleptinaemia and hypoadiponectinaemia might be involved in the occurrence of gallstone disease. However, the causal relationship of hyperleptinaemia and hypoadiponectinaemia with gallstone disease might require further investigation.
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Affiliation(s)
- S N Wang
- Division of Hepato-biliary-pancreatic Surgery, Department of Surgery, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
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Lee KT, Bhatia S, Mohamed AR, Chu KH. Optimizing the specific surface area of fly ash-based sorbents for flue gas desulfurization. Chemosphere 2006; 62:89-96. [PMID: 15996711 DOI: 10.1016/j.chemosphere.2005.03.094] [Citation(s) in RCA: 8] [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] [Subscribe] [Scholar Register] [Received: 03/08/2004] [Revised: 03/18/2005] [Accepted: 03/28/2005] [Indexed: 05/03/2023]
Abstract
High performance sorbents for flue gas desulfurization can be synthesized by hydration of coal fly ash, calcium sulfate, and calcium oxide. In general, higher desulfurization activity correlates with higher sorbent surface area. Consequently, a major aim in sorbent synthesis is to maximize the sorbent surface area by optimizing the hydration conditions. This work presents an integrated modeling and optimization approach to sorbent synthesis based on statistical experimental design and two artificial intelligence techniques: neural network and genetic algorithm. In the first step of the approach, the main and interactive effects of three hydration variables on sorbent surface area were evaluated using a full factorial design. The hydration variables of interest to this study were hydration time, amount of coal fly ash, and amount of calcium sulfate and the levels investigated were 4-32 h, 5-15 g, and 0-12 g, respectively. In the second step, a neural network was used to model the relationship between the three hydration variables and the sorbent surface area. A genetic algorithm was used in the last step to optimize the input space of the resulting neural network model. According to this integrated modeling and optimization approach, an optimum sorbent surface area of 62.2m(2)g(-1) could be obtained by mixing 13.1g of coal fly ash and 5.5 g of calcium sulfate in a hydration process containing 100ml of water and 5 g of calcium oxide for a fixed hydration time of 10 h.
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Affiliation(s)
- K T Lee
- School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, Seri Ampangan, 14300 Nibong Tebal, Pulau Pinang, Malaysia
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Raymond-Ooi EH, Lee KT, Mohamed AR, Chu KH. Neural network modeling of the kinetics of SO2 removal by fly ash-based sorbent. J Environ Sci Health A Tox Hazard Subst Environ Eng 2006; 41:195-210. [PMID: 16423725 DOI: 10.1080/10934520500351959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The mechanistic modeling of the sulfation reaction between fly ash-based sorbent and SO2 is a challenging task due to a variety reasons including the complexity of the reaction itself and the inability to measure some of the key parameters of the reaction. In this work, the possibility of modeling the sulfation reaction kinetics using a purely data-driven neural network was investigated. Experiments on SO2 removal by a sorbent prepared from coal fly ash/CaO/CaSO4 were conducted using a fixed bed reactor to generate a database to train and validate the neural network model. Extensive SO2 removal data points were obtained by varying three process variables, namely, SO2 inlet concentration (500-2000 mg/L), reaction temperature (60-80 degreesC), and relative humidity (50-70%), as a function of reaction time (0-60 min). Modeling results show that the neural network can provide excellent fits to the SO2 removal data after considerable training and can be successfully used to predict the extent of SO2 removal as a function of time even when the process variables are outside the training domain. From a modeling standpoint, the suitably trained and validated neural network with excellent interpolation and extrapolation properties could have immediate practical benefits in the absence of a theoretical model.
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Affiliation(s)
- E H Raymond-Ooi
- School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, Seri Ampangan, 14300 Nibong Tebal, Seberang Perai Selatan, Pulau Pinang, Malaysia
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Lee KT, Singh S, Lai CH. Semi-constrained total elbow arthroplasty for the treatment of rheumatoid arthritis of the elbow. Singapore Med J 2005; 46:718-22. [PMID: 16308647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
INTRODUCTION We retrospectively reviewed the results of total elbow arthroplasty in patients with rheumatoid arthritis of the elbow followed for a minimum of two years. METHODS Between September 1999 and March 2001, seven patients with rheumatoid arthritis of the elbow were treated with total elbow arthroplasty using the semi-constrained Coonrad-Morrey elbow replacement prostheses. One patient died 19 months after her surgery and was excluded from the study. Two patients had bilateral total elbow replacements. Eight elbows were thus available for review. The mean age of our patients at the time of surgery was 55.5 years. The indication for surgery was severe pain and stiffness in six elbows, and distal humerus fractures in two elbows. RESULTS The mean duration of postoperative hospitalisation stay was 6.6 days. The average length of follow-up was 39.4 months. Six elbows had no pain, while two elbows had mild pain. The mean arc of flexion was 101.3 degrees. The mean Mayo elbow performance score was 93.1 points. Excellent results were achieved in six elbows, while two elbows had good outcome. There was one case of intraoperative lateral condylar fracture treated with internal fixation. One patient developed blisters postoperatively but resolved with dressings and antibiotics. CONCLUSION Our small study revealed good to excellent short-term outcome with the use of semi-constrained total elbow arthroplasty for the treatment of rheumatoid arthritis of the elbow in Asian patients.
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Affiliation(s)
- K T Lee
- Department of Orthopaedic Surgery, Tan Tock Seng Hospital, Singapore 308433
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Lee KT, Hirano H, Yamakawa T, Kodama T, Igarashi Y, Shimomura K. Responses of transformed root culture of Atropa belladonna to salicylic acid stress. J Biosci Bioeng 2005; 91:586-9. [PMID: 16233044 DOI: 10.1263/jbb.91.586] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2000] [Accepted: 03/28/2001] [Indexed: 11/17/2022]
Abstract
The effect of salicylic acid (SA) on tropane alkaloid production and the responses to SA stress of transformed root cultures of Atropa belladonna (belladonna) were investigated. Treatment of A. belladonna transformed roots with 0.2 mM SA did not have any effect on tropane alkaloid production, but two compounds were produced in the medium. These were identified as the SA derivatives methylsalicylate and methyl-o-methoxybenzoate by high-resolution mass spectrometry and UV spectrometry. In contrast, treatment with 2 mM salicylic acid stimulated tropane alkaloid release from the transformed roots into the medium by up to 35% of the total alkaloids after 24 h, and the SA derivatives were not observed in the medium. These results revealed that transformed root of A. belladonna exhibits distinct by different responses to SA stress depending on the SA concentration.
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Affiliation(s)
- K T Lee
- Department of Biotechnology, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
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Kim TH, Choi BH, Chang GW, Lee KT, Lee HY, Lee JH, Kim KS, Park CK, Moran C. Molecular characterization and chromosomal mapping of porcine adipose differentiation-related protein (ADRP). J Anim Breed Genet 2005; 122:240-6. [PMID: 16060490 DOI: 10.1111/j.1439-0388.2005.00518.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [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: 11/30/2022]
Abstract
ADRP plays an important role in regulating lipid storage in various cells. We investigated the ADRP gene as a candidate gene for intramuscular fat deposition and marbling traits in pigs. A full-length transcript of porcine ADRP was cloned by RT-PCR and RACE. The porcine ADRP cDNA (1848 bp) contains a 1377-bp open reading frame, encoding a deduced protein of 459 amino acids, which has amino acid sequence identities of 89, 89, 82 and 81% with cattle, human, mouse and rat ADRP genes respectively. The genomic structure and sequence of the porcine ADRP were also analysed using a BAC clone of a Korean native pig. Pig ADRP comprises eight exons spanning approximately 13 kb and is located on chromosome 1 q2.3-q2.7 between microsatellite markers SW2185 and SW974. Several sequence variations were detected from nine different pig breeds. The biological role of this gene and the mapping localization indicated that the porcine ADRP is a possible candidate gene for fat deposition and marbling traits.
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Affiliation(s)
- T H Kim
- Animal Genomics and Bioinformatics Division, National Livestock Research Institute, Rural Development Administration, Suwon, Korea.
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Lee HW, Won KJ, Cho SH, Ha YH, Park WS, Yim HT, Baek M, Rew JH, Yoon SH, Yim SV, Chung JH, Lee KT. Quantitation of niflumic acid in human plasma by high-performance liquid chromatography with ultraviolet absorbance detection and its application to a bioequivalence study of talniflumate tablets. J Chromatogr B Analyt Technol Biomed Life Sci 2005; 821:215-20. [PMID: 15921965 DOI: 10.1016/j.jchromb.2005.05.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2005] [Accepted: 05/11/2005] [Indexed: 11/18/2022]
Abstract
A rapid and simple HPLC method with UV detection (288 nm) was developed and validated for quantitation of niflumic acid in human plasma, the active metabolite of talniflumate. After precipitation with 100% methanol containing the internal standard, indomethacin, the analysis of the niflumic acid level in the plasma samples was carried out using a reverse phase C18 CAPCELL PAK (5 microm, 4.6 mm x 250 mm) column. The chromatographic separation was accomplished with an isocratic mobile phase consisting of a mixture of 0.1M sodium acetate in water and acetonitrile (37:63, v/v), adjusted to pH 6.4. This HPLC method was validated by examining its precision and accuracy for inter- and intra-day runs in a linear concentration range of 0.02-5.00 microg/mL. Stability of niflumic acid in plasma was excellent, with no evidence of degradation during sample processing (autosampler) and 30 days storage in a freezer. This validated method was successfully applied to the bioequivalence study of talniflunate in healthy volunteers.
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Affiliation(s)
- H W Lee
- Department of Biochemistry, College of Pharmacy, Kyung Hee University, Hoegi-Dong, Dongdaemun-Ku, Seoul 130-701, Republic of Korea
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Lee LW, Zhang DH, Lee KT, Koay ESC, Hewitt RE. CC3/TIP30 expression was strongly associated with HER-2/NEU status in breast cancer. Ann Acad Med Singap 2004; 33:S30-2. [PMID: 15651195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Affiliation(s)
- L W Lee
- Oncology Research Institute, National University of Singapore, Singapore
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Lee KT, Lee YW, Lee JK, Choi SH, Rhee JC, Paik SS, Kong G. Overexpression of Id-1 is significantly associated with tumour angiogenesis in human pancreas cancers. Br J Cancer 2004; 90:1198-203. [PMID: 15026801 PMCID: PMC2409659 DOI: 10.1038/sj.bjc.6601684] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [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: 02/08/2023] Open
Abstract
It has been suggested that Id-1 has a critical role in the tumour progression and aggressiveness of several human cancers. However, the clinicopathological and biological significance of Id-1 overexpression remains unclear in human primary cancer. To investigate the association between Id-1 expression and cell proliferation or tumour angiogenesis, we examined the cell cycle kinetic indices (the proliferation and apoptotic indices, PI and AI) and intratumoral microvessel density (MVD) in 65 human pancreatic cancers. We also investigated the relationship between its expression and various clinicopathological factors to determine the clinical significance of Id-1 overexpression. Out of a total 65 cases, 32 (49.3%) showed overexpression of Id-1 vs normal tissues. Id-1 expression was found to be significantly associated with MVD (P=0.002). In further analysis of subgroups with higher and lower Id-1 expression, tumours with higher Id-1 expression (scores 4 and 5) showed significantly higher MVD than tumours with lower expression of Id-1 (scores 2 and 3) (111.18+/-57.14 vs 64.13+/-28.19, P<0.001). However, no significant association was found between Id-1 overexpression and patient survival rate. No significant association was also found between Id-1 expression and cell cycle kinetic indices (PI or AI) in pancreatic cancer. Moreover, the overexpression of Id-1 protein was not correlated with any significant clinicopathologic factors. These findings indicate that Id-1 overexpression is closely related with tumour angiogenesis and a higher density of intratumoral vessel, but that it is not associated with a poorer prognosis of survival or a higher cell proliferative potential in human pancreatic cancer.
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Affiliation(s)
- K T Lee
- Departments of Internal Medicine and General Surgery, Samsung Medical Center, Sungkyunkwan University, School of Medicine, Seoul, Korea
| | - Y W Lee
- Departments of Internal Medicine and General Surgery, Samsung Medical Center, Sungkyunkwan University, School of Medicine, Seoul, Korea
| | - J K Lee
- Departments of Internal Medicine and General Surgery, Samsung Medical Center, Sungkyunkwan University, School of Medicine, Seoul, Korea
| | - S H Choi
- Departments of Internal Medicine and General Surgery, Samsung Medical Center, Sungkyunkwan University, School of Medicine, Seoul, Korea
| | - J C Rhee
- Departments of Internal Medicine and General Surgery, Samsung Medical Center, Sungkyunkwan University, School of Medicine, Seoul, Korea
| | - S S Paik
- Department of Pathology, College of Medicine, Hanyang University, Seoul, Korea
| | - G Kong
- Department of Pathology, College of Medicine, Hanyang University, Seoul, Korea
- Department of Pathology, College of Medicine, Hanyang University, Seoul, Korea. E-mail:
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Abstract
The charged particle spectrum for nuclei from protons to neon, (charge Z=10) was observed during the cruise phase and orbit around Mars by the MARIE charged particle spectrometer on the Odyssey spacecraft. The cruise data were taken between April 23, 2001 and mid-August 2001. The Mars orbit data were taken March 5, 2002 through May 2002 and are scheduled to continue until August 2004. Charge peaks are clearly separated for charges up to Z=10. Especially prominent are the carbon and oxygen peaks, with boron and nitrogen also clearly visible. Although heavy ions are much less abundant than protons in the cosmic ray environment, it is important to determine their abundances because their ionization energy losses (proportional to Z2) are far more dangerous to humans and to instruments. Thus the higher charged nuclei make a significant contribution to dose and dose equivalent received in space. Results of the charged particle spectrum measurements will be reported.
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Affiliation(s)
- K T Lee
- University of Houston, Houston, TX 77204, USA.
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Li X, Jeong JH, Lee KT, Rho JR, Choi HD, Kang JS, Son BW. Gamma-pyrone derivatives, kojic acid methyl ethers from a marine-derived fungus Alternaria [correction of Altenaria] sp. Arch Pharm Res 2003; 26:532-4. [PMID: 12934644 DOI: 10.1007/bf02976876] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [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: 10/21/2022]
Abstract
Kojic acid dimethyl ether (1), and the known kojic acid monomethyl ether (2), kojic acid (3) and phomaligol A (4) have been isolated from the organic extract of the broth of the marine-derived fungus Alternaria sp. collected from the surface of the marine green alga Ulva pertusa. The structures were assigned on the basis of comprehensive spectroscopic analyses. Each isolate was tested for its tyrosinase inhibitory activity. Kojic acid (3) was found to have significant tyrosinase inhibitory activity, but compounds 1, 2, and 4 were found to be inactive.
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Affiliation(s)
- Xifeng Li
- Department of Chemistry, Pukyong National University, Busan 608-737, Korea
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Lee KT, Lee KS, Jeong JH, Jo BK, Heo MY, Kim HP. Inhibitory effects of Ramulus mori extracts on melanogenesis. J Cosmet Sci 2003; 54:133-42. [PMID: 12715091] [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] [Accepted: 12/18/2002] [Indexed: 03/02/2023]
Abstract
To develop an active agent for skin whitening, the inhibitory effects of 285 plant extracts on tyrosinase activity were examined, and one plant extract having tyrosinase inhibition activity was chosen. Ramulus mori (young twigs of Morus alba L.) extracts showed inhibition activity in tyrosinase and melanin synthesis in B-16 melanoma cells. To clarify the mechanism of its inhibition on melanogenesis, the effect of R. mori extracts on tyrosinase activity, synthesis, and gene expression was evaluated. R. mori extracts showed tyrosinase inhibition activity by competitive method, and there was no suppression of tyrosinase synthesis and gene expression. Further, to evaluate the inhibitory activity of R. mori in vivo, its effect on melanin production in UV-induced brown guinea pigs was examined, where a decrease of melanin production in the guinea pig model was observed. Also, R. mori extracts showed no toxicity in animal tests such as the acute toxicity test, the skin irritation test, the eye irritation test, the skin sensitization test, and the acute oral toxicity test, and no toxicity in the human skin irritation test. A single compound from R. mori extracts was purified using various column chromatography and recrystallization, and its chemical structure was identified using mass chromatography, IR spectroscopy, and NMR analysis. The chemical structure was that of 2,3',4,5'-tetrahydroxystilbene(2-oxyresveratrol) and showed inhibition activity on tyrosinase (IC(50) = 0.23 microg/ml). Also, R. mori extracts inhibited tyrosinase activity in a competitive manner (Ki = 1.5 x 10(-6) M) when L-tyrosine was used as a substrate.
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Affiliation(s)
- Kang Tae Lee
- Coreana Cosmetics Co., 204-1 JeongchonRi, Senggeoeup, Cheonansi, 330-830, Korea
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Kong G, Kim EK, Kim WS, Lee YW, Lee JK, Paik SW, Rhee JC, Choi KW, Lee KT. Inducible nitric oxide synthase (iNOS) immunoreactivity and its relationship to cell proliferation, apoptosis, angiogenesis, clinicopathologic characteristics, and patient survival in pancreatic cancer. Int J Pancreatol 2002; 29:133-40. [PMID: 12067216 DOI: 10.1385/ijgc:29:3:133] [Citation(s) in RCA: 25] [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] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND The clinicopathological and biological significance of the expression of iNOS in pancreatic cancer remains unclear. The goal of this study was to determine the possible roles and clinical significance of iNOS expression in pancreatic cancer. METHODS Seventy-two pancreatic adenocarcinoma tissue specimens were obtained by surgical resection. We investigated the immunohistochemical expression of iNOS in 72 patients with pancreatic cancer with respect to variable clinicopathological characteristics, proliferation activity (assessed by Ki-67 expression), apoptosis (assessed by TUNEL stain), and microvessel density (assessed by CD34 expression; angiogenesis). RESULTS Immunohistochemical investigations demonstrated immunolabeling of tumor cells with anti-iNOS antibody. Positivity for iNOS was observed in 48/72 (66.7%). The expression of iNOS protein did not correlate with age, bilirubin, tumor marker, location, size, AJCC stage, differentiation, distant metastasis, or patient survival. No significant association was found between iNOS expression and proliferation or microvessel density in pancreatic cancer. Apoptotic index (AI) of positive iNOS expressions were significantly higher than negative expression (p < 0.001). CONCLUSION Inducible nitric oxide synthase (iNOS) is expressed by human pancreatic cancer, and its presence is positively correlated with apoptosis of cancer cells that could provide the basis for the development of therapeutic strategies in human pancreatic cancer.
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Affiliation(s)
- G Kong
- Department of Pathology, Hanyang University School of Medicine, Seoul, Korea
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