1
|
Deng J, Chin S, Tariveranmoshabad M, Lee H, Graham D, Quintero M, Schaue D, Kalbasi A. Intratumoral dsRNA Sensor Activation Redirects Radiation-Associated Myeloid Cells to Ignite Local and Systemic Anti-Tumor Immunity in Undifferentiated Pleomorphic Sarcoma. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
2
|
Oh J, Lee RW, Lee HR, Lee SB, Ju HJ, Park J, Park HR, Park JH, Hann SK, Almurayshid A, Shin J, Kang HY, Bae JM, Oh SH. Classification of facial and truncal segmental vitiligo and its clinical courses including recurrence rate and patterns: a retrospective review of 956 patients. Br J Dermatol 2020; 184:750-753. [PMID: 33131051 DOI: 10.1111/bjd.19661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 10/29/2020] [Accepted: 10/30/2020] [Indexed: 11/30/2022]
Affiliation(s)
- J Oh
- Department of Dermatology, Severance Hospital, Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - R W Lee
- Department of Dermatology, St Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - H R Lee
- Department of Dermatology, Ajou University School of Medicine, Suwon, Korea
| | - S B Lee
- Department of Dermatology, Inha University, School of Medicine, Incheon, Republic of Korea
| | - H J Ju
- Department of Dermatology, St Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - J Park
- Department of Education and Training, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - H R Park
- Department of Education and Training, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - J H Park
- Drs Woo and Hann's Skin Center, Seoul, Korea
| | - S-K Hann
- Drs Woo and Hann's Skin Center, Seoul, Korea
| | - A Almurayshid
- Department of Medicine, College of Medicine, Prince Sattam Bin Abdulaziz University, Saudi Arabia
| | - J Shin
- Department of Dermatology, Inha University, School of Medicine, Incheon, Republic of Korea
| | - H Y Kang
- Department of Dermatology, Ajou University School of Medicine, Suwon, Korea
| | - J M Bae
- Department of Dermatology, St Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - S H Oh
- Department of Dermatology, Severance Hospital, Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
| |
Collapse
|
3
|
Melianas A, Quill TJ, LeCroy G, Tuchman Y, Loo HV, Keene ST, Giovannitti A, Lee HR, Maria IP, McCulloch I, Salleo A. Temperature-resilient solid-state organic artificial synapses for neuromorphic computing. Sci Adv 2020; 6:6/27/eabb2958. [PMID: 32937458 PMCID: PMC7458436 DOI: 10.1126/sciadv.abb2958] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 05/20/2020] [Indexed: 05/18/2023]
Abstract
Devices with tunable resistance are highly sought after for neuromorphic computing. Conventional resistive memories, however, suffer from nonlinear and asymmetric resistance tuning and excessive write noise, degrading artificial neural network (ANN) accelerator performance. Emerging electrochemical random-access memories (ECRAMs) display write linearity, which enables substantially faster ANN training by array programing in parallel. However, state-of-the-art ECRAMs have not yet demonstrated stable and efficient operation at temperatures required for packaged electronic devices (~90°C). Here, we show that (semi)conducting polymers combined with ion gel electrolyte films enable solid-state ECRAMs with stable and nearly temperature-independent operation up to 90°C. These ECRAMs show linear resistance tuning over a >2× dynamic range, 20-nanosecond switching, submicrosecond write-read cycling, low noise, and low-voltage (±1 volt) and low-energy (~80 femtojoules per write) operation combined with excellent endurance (>109 write-read operations at 90°C). Demonstration of these high-performance ECRAMs is a fundamental step toward their implementation in hardware ANNs.
Collapse
Affiliation(s)
- A Melianas
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA.
| | - T J Quill
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - G LeCroy
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - Y Tuchman
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - H V Loo
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
- Zernike Institute for Advanced Materials, University of Groningen, 9747AG Groningen, Netherlands
| | - S T Keene
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - A Giovannitti
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - H R Lee
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - I P Maria
- Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London, UK
| | - I McCulloch
- Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London, UK
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center, Thuwal, Saudi Arabia
| | - A Salleo
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA.
| |
Collapse
|
4
|
Lee H, Hong S. The effect of the long-term treatment with vagus nerve stimulation on objective respiratory patterns and subjective sleep quality and daytime sleepiness in korean patients with drug-resistant epilepsy. Sleep Med 2019. [DOI: 10.1016/j.sleep.2019.11.604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
5
|
Adam GO, Lee HR, Lee SJ, Kim SJ, Kim GB, Kang HS. Effects of acute lipopolysaccharide-induced toxemia model on some neglected blood parameters. Pol J Vet Sci 2019; 21:665-671. [PMID: 30605278 DOI: 10.24425/124304] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The presence of lipopolysaccharide (LPS) in blood induces an inflammatory response which leads to multiple organ dysfunction and numerous metabolic disorders. Uncontrolled, improper or late intervention may lead to tissue hypoxia, anaerobic glycolysis and a disturbance in the acid -base balance. The effects of LPS-induced toxemia on biological and immunological markers were well studied. However, parameters such as base excess, ions, and acid-base balance were not fully investigated. Therefore, the objective of this study was to examine these blood parameters collectively in LPS-induced inflammatory toxemia in rat's model. After induction of toxemia by injecting LPS at a rate of 5 mg/kg body weight intravenously, blood was collected from the tail vein of twenty rats and immediately analyzed. After 24 hours, the animals were sacrificed and the blood was collected from the caudal vena cava. The results revealed that the levels of pH, bicar- bonate, partial pressure of oxygen, oxygen saturation, Alveolar oxygen, hemoglobin, hematocrit, magnesium (Mg2+), and calcium (Ca2+) were significantly decreased. On the other side, the levels of Base excess blood, Base excess extracellular fluid, partial pressure of carbon dioxide, lactate, Ca2+/Mg2+, potassium, and chloride were significantly increased compared to those found pre toxemia induction. However, sodium level showed no significant change. In conclusion, Acute LPS-toxemia model disturbs acid-base balance, blood gases, and ions. These parameters can be used to monitor human and animal toxemic inflammatory response induced by bacterial LPS conditions to assist in the management of the diagnosed cases.
Collapse
Affiliation(s)
- G O Adam
- Department of Pharmacology, College of Veterinary Medicine, Chonbuk National University, Iksan Campus, 79 Gobong-ro, Iksan-si, Jeollabuk-do 54596 Republic of Korea.,Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, Sudan University of Science and Technology, P.O. Box No. 204, Hilat Kuku, Khartoum, Sudan
| | - H R Lee
- Department of Pharmacology, College of Veterinary Medicine, Chonbuk National University, Iksan Campus, 79 Gobong-ro, Iksan-si, Jeollabuk-do 54596 Republic of Korea
| | - S J Lee
- Korea Basic Science Institute Jeonju Center, Deokjingu, Jeonjusi, Jeollabukdo 54896, Republic of Korea
| | - S J Kim
- Department of Pharmacology, College of Veterinary Medicine, Chonbuk National University, Iksan Campus, 79 Gobong-ro, Iksan-si, Jeollabuk-do 54596 Republic of Korea
| | - G B Kim
- Department of Pharmacology, College of Veterinary Medicine, Chonbuk National University, Iksan Campus, 79 Gobong-ro, Iksan-si, Jeollabuk-do 54596 Republic of Korea
| | - H S Kang
- Department of Pharmacology, College of Veterinary Medicine, Chonbuk National University, Iksan Campus, 79 Gobong-ro, Iksan-si, Jeollabuk-do 54596 Republic of Korea
| |
Collapse
|
6
|
Lee HR, Lee H, Cassel K, Hagiwara M, Somera L. Acculturation, Biculturalism and Cancer Risk and Preventive Behaviors Among Pacific Islander Immigrant Youths in Hawaii. J Glob Oncol 2018. [DOI: 10.1200/jgo.18.56800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Background: Culture is an important force which affects health behaviors linked to cancer risks among immigrants. Studies have demonstrated the process of acculturation can produce a form of stress that impact health negatively. On the other hand, research suggests that biculturalism, defined as the combining and practicing of customs from two cultures, may be a healthy approach to acculturation. Biculturalism is especially relevant for youth immigrants as their cultural identities are still developing. Pacific Islanders, a fastest growing populations in the US, often experience discrimination in the society at large and in the health care system. Pacific Islander youth in the US navigate between two cultural identities: their native culture as they live in a close-knit community that still maintains strong cultural norms and values, and the dominant American culture that they face once they step outside their community. This is one of the rare studies that examine the relationship between acculturation and cancer preventive behaviors among Pacific Islander youth. Aim: We aim to study the process through which biculturalism influences cancer risk and preventive behaviors such as smoking, sunscreen applications, physical activity and healthy eating among Pacific Islander youth immigrants in Hawaii. Specifically, we map the process of influence that links biculturalism to self-esteem and to these cancer risk and preventive behaviors. Methods: Using survey data from 284 Pacific Islander youth, we developed and tested a theoretically driven model that specifies the relationship among variables listed above. Results: Results show that self-esteem serves as an important mediator connecting biculturalism to cancer preventive behaviors. While biculturalism did not have a direct influence on behaviors and outcomes, it led to increased self-esteem which, in turn, directly influenced attitudes about sunscreen application, physical activity and healthy eating. However, there was neither direct nor indirect link between biculturalism and smoking. Conclusion: While numerous studies have shown links between biculturalism and health, not many studies focus on the specific process through which the influence is exerted. This study provides an important insight into the process through which biculturalism impacts cancer preventive behaviors among minority youth in America. Data from the study showed a clear relationship between biculturalism, self-esteem, their attitudes and behavior related to cancer prevention among Pacific Islander youth living in Hawaii. This study provides insights into potentially novel methods and interventions designed to increase cancer preventive behaviors among migrant youth by dually promoting adoption of U.S. cultural norms, while concurrently embracing an individual´s historic cultural identity.
Collapse
Affiliation(s)
- H.-R. Lee
- University of Hawaii at Manoa, Honolulu, HI
| | - H.E. Lee
- Ewha Woman's University, Seoul, Republic of Korea
| | - K. Cassel
- University of Hawaii at Manoa, Honolulu, HI
| | | | | |
Collapse
|
7
|
Cassel K, Lee HR, Somera L, Badowski G. Culture, Communication, and Cancer Risk Behaviors Among Pacific Islanders in Hawaii. J Glob Oncol 2018. [DOI: 10.1200/jgo.18.37300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Background: A priority of the National Cancer Institute (NCI) is to acquire, aggregate and integrate cancer control data that facilitates collaborations to address health disparities and communication inequalities. To better communicate cancer research to the public, the NCI developed the Health Information National Trends Survey (HINTS). However, as with most national health surveillance systems, HINTS nationally obtained data are not sufficient to address the behaviors of unique demographic and geographic subpopulations. US Pacific Islanders are one of the fastest growing population groups in the US, and cancer is the leading cause of death in this group. Limited knowledge about the cancer communication practices and risk behaviors of US Pacific Islanders drive the poor implementation of effective cancer prevention interventions. Aim: This study aims to document the prevalence and differences in the cancer relevant knowledge, attitudes, and information seeking practices of Pacific Islander populations residing in Hawaii. Specifically, we aim to expand HINTS assessment to native Hawaiians and recent migrant Marshallese and Chuukese populations in Hawaii. Methods: We conducted surveys with 352 native Hawaiians, 282 Chuukese, and 129 Marshallese residing in HI. We used Respondent Driven Sampling method (RDS) to recruit these geographically diffuse populations in HI. The survey included questions about basic knowledge, attitude and behavior about various cancers, detailed communication behaviors about health information, and cultural beliefs and practices. Results: Data show there are clear differences among the three ethnic groups across a variety of cancer-related attitudes, knowledge, behaviors and risk factors. For example, a larger proportion of Chuukese have BMIs that can be described as obese or morbidly obese compared with native Hawaiians. On the other hand, native Hawaiians are significantly more likely to smoke than Marshallese and Chuukese. These groups also differ significantly regarding the level of acculturation, religiosity, fatalism about cancer, and trust in medical professionals. Regarding communication, cell phone use was common with 75% of native Hawaiians, 80% of Marshallese and 88% of Chuukese having cell phones. This use of cellphone technology was in stark contrast to Internet use with only 45% of native Hawaiians, 49% of Marshallese and 27% of Chuukese reporting access to the Web. Conclusion: There is a need for cancer prevention programs for Pacific Islanders in Hawaii. An effective health program has to address their unique cultural beliefs and practices, and fit their unique communication ecology. This study provides new knowledge concerning the use of nonprobability based study sampling methods, and the role of culture in cancer-related communications in influencing cancer risk behaviors that may be generalizable to the growing number of migrant Pacific Islander populations living in the US.
Collapse
Affiliation(s)
- K. Cassel
- University of Hawaii Cancer Center, Honolulu, HI
| | - H.-R. Lee
- University of Hawaii at Manoa, Honolulu, HI
| | | | | |
Collapse
|
8
|
Jeong K, Lee SY, Ahn K, Kim J, Lee HR, Suh DI, Pyun BY, Min TK, Kwon JW, Kim KE, Kim KW, Sohn MH, Kim YH, Song TW, Kwon JH, Jeon YH, Kim HY, Kim JH, Ahn YM, Lee S. A multicenter study on anaphylaxis caused by peanut, tree nuts, and seeds in children and adolescents. Allergy 2017; 72:507-510. [PMID: 27892597 DOI: 10.1111/all.13096] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/21/2016] [Indexed: 11/29/2022]
Abstract
Peanut (PN) and tree nuts (TNs) are common causes of anaphylaxis in Western countries, but no information is available in Korea. To feature clinical characteristics of anaphylaxis caused by PN, TNs, and seeds, a retrospective medical record review was performed in 14 university hospitals in Korea (2009-2013). One hundred and twenty-six cases were identified, with the mean age of 4.9 years. PN, walnut (WN), and pine nut accounted for 32.5%, 41.3%, and 7.1%, respectively. The median values of specific IgE (sIgE) to PN, WN, and pine nut were 10.50, 8.74, and 4.61 kUA /l, respectively. Among 50 cases managed in the emergency department, 52.0% were treated with epinephrine, 66.0% with steroid, 94.0% with antihistamines, 36.0% with oxygen, and 48.0% with bronchodilator. In conclusion, WN, PN, and pine nut were the three most common triggers of anaphylaxis in Korean children, and anaphylaxis could occur at remarkably low levels of sIgE.
Collapse
Affiliation(s)
- K. Jeong
- Department of Pediatrics; Ajou University School of Medicine; Suwon Korea
| | - S.-Y. Lee
- Department of Pediatrics; Hallym University Sacred Heart Hospital; Hallym University College of Medicine; Anyang Korea
| | - K. Ahn
- Department of Pediatrics; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Korea
| | - J. Kim
- Department of Pediatrics; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Korea
| | - H.-R. Lee
- Department of Pediatrics; Hallym University Sacred Heart Hospital; Hallym University College of Medicine; Anyang Korea
| | - D. I. Suh
- Department of Pediatrics; Seoul National University Hospital; Seoul Korea
| | - B.-Y. Pyun
- Department of Pediatrics; Soonchunhyang University Hospital; Seoul Korea
| | - T. K. Min
- Department of Pediatrics; Soonchunhyang University Hospital; Seoul Korea
| | - J.-W. Kwon
- Department of Pediatrics; Seoul National University Bundang Hospital; Seongnam Korea
| | - K.-E. Kim
- Department of Pediatrics; Severance Hospital; Institute of Allergy; Yonsei University College of Medicine; Seoul Korea
| | - K. W. Kim
- Department of Pediatrics; Severance Hospital; Institute of Allergy; Yonsei University College of Medicine; Seoul Korea
| | - M. H. Sohn
- Department of Pediatrics; Severance Hospital; Institute of Allergy; Yonsei University College of Medicine; Seoul Korea
| | - Y. H. Kim
- Department of Pediatrics; Severance Hospital; Institute of Allergy; Yonsei University College of Medicine; Seoul Korea
| | - T. W. Song
- Department of Pediatrics; Inje University Ilsan Paik Hospital; Goyang Korea
| | - J. H. Kwon
- Department of Pediatrics; Korea University College of Medicine; Ansan Korea
| | - Y. H. Jeon
- Department of Pediatrics; Dongtan Sacred Heart Hospital; Hallym University College of Medicine; Hwaseong Korea
| | - H. Y. Kim
- Department of Pediatrics; Pusan National University Children's Hospital; Yangsan Korea
| | - J. H. Kim
- Department of Pediatrics; Inha University Hospital; Incheon Korea
| | - Y. M. Ahn
- Department of Pediatrics; Eulji Hospital; Eulji University School of Medicine; Seoul Korea
| | - S. Lee
- Department of Pediatrics; Ajou University School of Medicine; Suwon Korea
| |
Collapse
|
9
|
Abstract
The matter of whether there should be separate registration for those practising in the field of medical ultrasound has long been debated. The United Kingdom Association of Sonographers (UKAS) has been a protagonist for such registration since it was formed approximately a decade ago. On the other hand, the College of Radiographers (CoR) has held to the view that this was not necessary as ultrasound came within the scope of practice of radiography and the majority of non-medical ultrasound practitioners are radiographers. The advent of the Health Professions Council, the increased focus on regulation of health care practitioners and significant developments in ultrasound applications has led to this matter being debated further. In particular, it has led to joint working by CoR and UKAS to scope an application for 'Sonographer' to become a protected title and, hence, sonography a registered profession. The history and background to this current work is outlined, together with a brief review of the work taking place and the steps that must be taken if the application is to be submitted.
Collapse
|
10
|
Park GN, Kim SH, Kang HS, Lee HR, Jo HJ, Jeoung HY, An DJ, Chang KS. Isolation frequency and epidemiological characterization of yeast-like fungi and co-infected bacteria isolated from clinical patient. ACTA ACUST UNITED AC 2016. [DOI: 10.5897/jyfr2015.0160] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
|
11
|
Shin DY, Lee HR, Na I, Yuh Y, Kim B, Chung I, Bae WK, Shim HJ, Song EK, Yang S, Kang H. 188P Modified FOLFOX-6 as 1st line therapy for adenocarcinoma of unknown primary: a multicenter phase II study. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv523.49] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
12
|
Koo BS, Lee HR, Jeon EO, Jang HS, Han MS, Min KC, Lee SB, Kim JJ, Mo IP. An outbreak of lymphomas in a layer chicken flock previously infected with fowlpox virus containing integrated reticuloendotheliosis virus. Avian Dis 2014; 57:812-7. [PMID: 24597128 DOI: 10.1637/10551-041113-case.r1] [Citation(s) in RCA: 11] [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] [Indexed: 11/05/2022]
Abstract
Visceral lymphomas occurred in a 236-day-old layer flock previously diagnosed with reticuloendotheliosis virus (REV)-integrated fowlpox virus (FPV) infection at the age of 77 days. Common pathologic lesions were multiple neoplastic nodules of homogeneous lymphocytes in the livers and spleens of all submitted chickens. All neoplastic tissues were positive for the REV envelope (env) gene by PCR. In a retrospective molecular study of FPV-infected 77-day-old chickens from the same flock, we identified nearly full-length REV provirus integrated into the genome of FPV as well as the REV env gene in trachea samples, whereas only the REV LTR region was present in the FPV strain used to vaccinate this flock. The 622-bp REV env gene nucleotide sequence derived from the trachea and neoplastic tissues was identical. Commercial ELISA of serum samples revealed that all chickens aged between 17 and 263 days in this flock were positive for REV but not for avian leukosis virus. Taken together, the evidence suggests that the visceral lymphomas were caused by a REV-integrated FPV field strain. FPV infections of commercial chickens should be followed up by careful monitoring for manifestations of REV infection, including lymphomas and immune depression, considering the ease with which the REV provirus appears to be able to integrate into the FPV genome.
Collapse
Affiliation(s)
- B S Koo
- Avian Disease Laboratory, College of Veterinary Medicine, Chungbuk National University, Cheongju, 361-763, Korea
| | - H R Lee
- Avian Disease Laboratory, College of Veterinary Medicine, Chungbuk National University, Cheongju, 361-763, Korea
| | - E O Jeon
- Avian Disease Laboratory, College of Veterinary Medicine, Chungbuk National University, Cheongju, 361-763, Korea
| | - H S Jang
- Avian Disease Laboratory, College of Veterinary Medicine, Chungbuk National University, Cheongju, 361-763, Korea
| | - M S Han
- Avian Disease Laboratory, College of Veterinary Medicine, Chungbuk National University, Cheongju, 361-763, Korea
| | - K C Min
- Avian Disease Laboratory, College of Veterinary Medicine, Chungbuk National University, Cheongju, 361-763, Korea
| | - S B Lee
- Avian Disease Laboratory, College of Veterinary Medicine, Chungbuk National University, Cheongju, 361-763, Korea
| | - J J Kim
- Avian Disease Laboratory, College of Veterinary Medicine, Chungbuk National University, Cheongju, 361-763, Korea
| | - I P Mo
- Avian Disease Laboratory, College of Veterinary Medicine, Chungbuk National University, Cheongju, 361-763, Korea
| |
Collapse
|
13
|
Lee HR, Go RE, Choi KC. 127 TREATMENTS WITH DIVERSE ENDOCRINE-DISRUPTING CHEMICALS RESULTED IN THE INHIBITION OF OVARIAN TUMOR PROGRESSION VIA INTERRUPTION OF TRANSFORMING GROWTH FACTOR-β IN IN VITRO AND XENOGRAFTED MOUSE MODELS. Reprod Fertil Dev 2014. [DOI: 10.1071/rdv26n1ab127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Activated oestrogen receptor (ER) signaling pathway by 17β-estadiol (E2) appeared to suppress transforming growth factor β (TGF-β) signaling pathway by cross-talk with TGF-β components in ER-positive cancer cells. In this study, we further examined the inhibitory effects of alkylphenols, including 4-nonylphenol (NP), 4-otylphenol (OP), bisphenol A (BPA), and benzophenon-1 (BP-1), in TGF-β signaling pathway. The transcriptional and translational levels of TGF-β-related genes were examined by reverse-transcription PCR (RT-PCR), Western blotting analysis in xenografted mouse models of ovarian cancer BG-1 cells. The NP, OP, and BPA induced the expression of snoN, a TGF-β pathway inhibitor. Treatment with NP, BPA, and BP-1 resulted in decreased phosphorylation of Smad3, a downstream target of TGF-β. With these 2 effects, NP and BPA stimulated the proliferation of BG-1 cells via inhibition of the TGF-β signaling pathway. In a xenograft mouse model, transplanted BG-1 ovarian cancer cells showed significantly decreased phosphorylation of Smad3 and increased expression of snoN in the ovarian tumour masses following treatment with E2, NP, or BPA. In parallel with an in vitro model, the expressions of TGF-β signaling pathway were similarly regulated by NP or BPA in a xenograft mouse model, revealing consistent results. Taken together, these results support that NP and BPA may cause the disruption of the TGF-β signaling pathway and increase the risk of oestrogen-dependent cancers such as ovarian cancer.
This work was supported by a grant from the Next-Generation BioGreen 21 Program (No. PJ009599), Rural Development Administration, Republic of Korea.
Collapse
|
14
|
Lee HR, Jun HK, Choi BK. Tannerella forsythia BspA increases the risk factors for atherosclerosis in ApoE(-/-) mice. Oral Dis 2013; 20:803-8. [PMID: 24372897 DOI: 10.1111/odi.12214] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Revised: 11/04/2013] [Accepted: 11/18/2013] [Indexed: 12/23/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate the effects of Tannerella forsythia and its major surface virulence factor, BspA, on the progression of atherosclerosis in ApoE(-/-) mice and the expression of lipid metabolism-related genes. METHODS PMA-differentiated THP-1 cells were treated with BspA to detect foam cell formation. The proximal aortas of ApoE(-/-) mice injected with T. forsythia or BspA were stained with oil red O to examine lipid deposition. The serum levels of CRP, HDL, and LDL were detected by ELISA. The liver tissue of T. forsythia- or BspA-injected ApoE(-/-) mice was examined for mRNA expression of lipid metabolism-related genes, such as liver X receptors (LXRα and LXRβ) and ATP-binding cassette transporter A1 (ABCA1). RESULTS Tannerella forsythia and BspA induced foam cell formation in THP-1 cells and accelerated the progression of atherosclerotic lesions in ApoE(-/-) mice. Mouse serum levels of CRP and LDL were increased, and HDL was decreased by T. forsythia and BspA. The expression levels of LXRα and LXRβ, and ABCA1 in liver tissue were decreased by T. forsythia and BspA. CONCLUSIONS Tannerella forsythia and BspA augmented atherosclerotic lesion progression in ApoE(-/-) mice. This process may be associated with downregulation of lipid metabolism-related gene expression.
Collapse
Affiliation(s)
- H R Lee
- Division of High-Risk Pathogen Research, Center for Infectious Diseases, National Institute of Health, Cheongwon-gun, Chungbuk, Korea
| | | | | |
Collapse
|
15
|
Koo BS, Lee HR, Jeon EO, Han MS, Min KC, Lee SB, Mo IP. Molecular survey of enteric viruses in commercial chicken farms in Korea with a history of enteritis. Poult Sci 2013; 92:2876-85. [PMID: 24135590 PMCID: PMC7194588 DOI: 10.3382/ps.2013-03280] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Several enteric viruses have increasingly received attention as potential causative agents of runting-stunting syndrome (RSS) in chickens. A molecular survey was performed to determine the presence of a broad range of enteric viruses, namely chicken astrovirus (CAstV), avian nephritis virus (ANV), chicken parvovirus (ChPV), infectious bronchitis virus (IBV), avian rotavirus (AvRV), avian reovirus (ARV), and fowl adenovirus (FAdV), in intestinal samples derived from 34 commercial chicken flocks that experienced enteritis outbreaks between 2010 and 2012. Using techniques such as PCR and reverse-transcription PCR, enteric viruses were identified in a total of 85.3% of investigated commercial chicken flocks in Korea. Furthermore, diverse combinations of 2 or more enteric viruses were simultaneously identified in 51.7% of chicken farms positive for enteric viruses. The rank order of positivity for enteric viruses was as follows: ANV (44.1%), CAstV (38.2%), ChPV (26.5%), IBV (20.6%), ARV (8.8%), AvRV (5.9%), and FAdV (2.9%). Additionally, other pathogens such as Escherichia coli, Salmonella spp., Eimeria spp., and FAdV were detected in 79% of chicken flocks positive for enteric viruses using PCR, bacterial isolation, and microscopic examination. The results of our study indicate the presence of several enteric viruses with various combinations in commercial chicken farms that experienced enteritis outbreaks. Experimental studies are required to further understand the roles of enteric viruses in RSS in commercial chickens.
Collapse
Affiliation(s)
- B S Koo
- College of Veterinary Medicine, Chungbuk National University, 410 SungBong-Ro, Cheongju-si, Chungbuk, 361-763, Korea
| | | | | | | | | | | | | |
Collapse
|
16
|
Lee HR, Hyun SH, Jeung EB, Choi KC. 193 BISPHENOL A AND PHTHALATE ENHANCED THE GROWTH OF PROSTATE CANCER CELLS AND ALTERED TGF-β SIGNALING MOLECULES VIA AN ESTROGEN RECEPTOR OR ANDROGEN RECEPTOR-DEPENDENT PATHWAY IN IN VITRO AND IN VIVO MODELS. Reprod Fertil Dev 2013. [DOI: 10.1071/rdv25n1ab193] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Endocrine-disrupting chemicals (EDC) can bind to the hormone receptor and induce an unexpected hormone response to activate oestrogen receptor (ER)- and androgen receptor (AR)-mediated signalling pathways. Among EDC, bisphenol A (BPA) has a detrimental effect on the endocrine system and is suspected to promote human breast and ovarian cancers. Recent studies have reported that phthalate can disrupt the endocrine system and has a weak estrogenic activity with binding to ER. In this study, we demonstrated whether BPA and dibutyl phthalate (DBP) stimulate the proliferation of prostate cancer cells, LNCaP cells, which have both ER and AR. We evaluated the proliferative rate of LNCaP cells following BPA and DBP treatment using a cell viability assay compared with EtOH treatment as a negative control. Further, we examined the alteration of cell cycle-related gene expressions and TGF-β signalling molecules by semiquantitative RT-PCR. Both BPA and DBP increased LNCaP cell growth more than 2-fold. Moreover, these EDC altered transcriptional expressions of cell cycle-related genes, cyclin D1 and p21, at 6 h in LNCaP cells after exposure of BPA and DBP. Like 17β-oestradiol (E2) and dihydrotestosterone (DHP), treatments of BPA and DBP lead to an increase of the transcriptional levels of c-myc and c-fos in LNCaP cells from 30 min to 6 h. In addition, BPA and DBP decreased the protein level of not only p-smad but also total smad, suggesting that these EDC can affect the molecules of the TGF-β signalling pathway. It was of interest that these effects of EDC were reversed by an antagonist of ER or AR signalling pathways in these prostate cancer cells. These results suggest that BPA and phthalate can alter various gene expressions in TGF-β signalling molecules and stimulate cell growth in prostate cancer cells in vitro. In addition, the growth of prostate cancer cells was stimulated following the exposure of E2, DHT, and DBP in vivo. Taken together, these results indicate the potential of BPA and phthalate in the carcinogenesis of prostate cancer by the oestrogen or androgen-dependent signalling pathway.
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Ministry of Education, Science and Technology (MEST) of Korea government (no. 2011-0015385).
Collapse
|
17
|
Salim HM, Lee HR, Jo C, Lee SK, Lee BD. Effect of sex and dietary organic zinc on growth performance, carcass traits, tissue mineral content, and blood parameters of broiler chickens. Biol Trace Elem Res 2012; 147:120-9. [PMID: 22167309 DOI: 10.1007/s12011-011-9282-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Accepted: 11/17/2011] [Indexed: 11/25/2022]
Abstract
Zinc (Zn) is an essential mineral for animal development and function. A study was carried out to evaluate the effect of sex and dietary organic zinc (OZ) on growth performance, carcass traits, tissue mineral content, and blood parameters of broiler chickens. A total of 240 1-day-old male and 240 female broiler chicks (Cobb × Cobb) were assigned to two dietary levels of OZ (2 × 2 factorial) with six replicates per treatment (20 birds/replicate pen). The OZ supplementation levels were 0 and 25 ppm. Results showed that OZ supplementation did not affect the growth performance of male and female broilers, but the males showed significantly better (P < 0.05) growth performance than females did. Similarly, OZ supplementation did not affect the thickness of both the back and thigh skin of male and female broilers; however, males had thicker skin than females. Dietary OZ supplementation did not affect collagen contents in the skin and meat samples. Male broilers had higher skin collagen contents than females, but no sex difference was found in meat collagen contents. OZ supplementation did not affect the shear force values of skin and meat samples. Male broilers had higher shear force values of back skin than females, but not in the meat samples. Dietary OZ supplementation increased (P < 0.05) the thigh meat Zn content in both sexes. The plasma Ca content was significantly (P < 0.05) increased by dietary OZ supplementation; however, other blood parameters were not affected by dietary OZ supplementation. Males had higher plasma glucose and cholesterol content than females. It is concluded that dietary OZ supplementation at the level of 25 ppm does not affect the growth performance and skin quality of broiler chickens but increases the Zn content in thigh meat and Ca content in plasma of broiler chickens. Male broilers had better growth performance and skin quality than females.
Collapse
Affiliation(s)
- H M Salim
- Department of Animal Science and Biotechnology, Chungnam National University, Yuseong-gu, Daejeon, South Korea.
| | | | | | | | | |
Collapse
|
18
|
Abstract
The trabecular microstructure of normal lunates and lunates with Kienböck's disease was investigated using micro-computed tomography (micro-CT). Five lunates with advanced Kienböck's disease were obtained during lunate excision and scaphocapitate fusion, and five control lunates were from embalmed cadavers. Microstructural morphometric parameters were measured using micro-CT images. Trabeculations of lunates with Kienböck's disease were 2.67 times denser and 1.84 times thicker than those of normal lunates. Furthermore, bone surface areas were 1.43 times greater and bone volume 2.67 times greater, and structural model indices were significantly lower in lunates with Kienböck's disease. The study estimated that high mechanical stress would be applied to lunates with Kienböck's disease, and suggests that new bone formation and collapse may play important roles in the microstructural changes in the lunate with advanced Kienböck's disease.
Collapse
Affiliation(s)
- K-J Han
- Department of Orthopaedic Surgery, Ajou University School of Medicine, Suwon, Korea
| | | | | | | | | |
Collapse
|
19
|
Salim HM, Lee HR, Jo C, Lee SK, Lee BD. Supplementation of graded levels of organic zinc in the diets of female broilers: effects on performance and carcase quality. Br Poult Sci 2012; 52:606-12. [PMID: 22029788 DOI: 10.1080/00071668.2011.616485] [Citation(s) in RCA: 12] [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: 10/15/2022]
Abstract
Zinc is an essential trace element. The objective of this research was to investigate the effects of various levels of organic zinc (OZ) supplementation on growth performance and carcase quality of female broiler chickens. A total of 3200 1-d-old female broiler chicks were randomly allotted to 16 floor pens with 200 birds per pen. A maize-wheat-soyabean meal basal diet (Control) was formulated and 20 mg/kg OZ (20 OZ), 40 mg/kg OZ (40 OZ), and 80 mg/kg OZ (80 OZ) were added to the basal diet to form 4 dietary treatments with 4 replicates per treatment. The OZ source was zinc proteinate which contained 15% zinc. Results showed no significant difference between the treatments in growth performance. A significant increase in thigh skin epidermis and dermis thickness was shown in the OZ supplementation groups; however, no effect was found on the thickness of back skin epidermis and dermis. Collagen contents in breast and thigh meats were not influenced by OZ supplementation but a significant increase in collagen content was found in the back and thigh skin. This increase in collagen content was significantly greater in the back and thigh skin of OZ 80 than with OZ 20. Shear force value and zinc concentration in skins and meat were not significantly influenced by supplementation with OZ. It is concluded that dietary OZ does not improve growth performance of broilers; however, it could increase skin thickness by increasing collagen content in skin, thereby improving carcase quality.
Collapse
Affiliation(s)
- H M Salim
- Department of Animal Science and Biotechnology, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, South Korea
| | | | | | | | | |
Collapse
|
20
|
Salim H, Lee H, Jo C, Lee S, Lee B. Effect of dietary zinc proteinate supplementation on growth performance, and skin and meat quality of male and female broiler chicks. Br Poult Sci 2012; 53:116-24. [DOI: 10.1080/00071668.2012.658757] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
21
|
Kim E, Yu A, Lee K, Lee H, Moon J, Hong S, Kim J. Exposure and risk assessment of benomyl for applicator during treatment in apple orchard. Toxicol Lett 2011. [DOI: 10.1016/j.toxlet.2011.05.893] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
22
|
Kim E, Na Y, Lee H, Moon J, Hong S, Park K, Kim J. Applicator exposure and risk assessment to fenthion during treatment in paddy field. Toxicol Lett 2011. [DOI: 10.1016/j.toxlet.2011.05.892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
23
|
Lee HR, Rhyu IC, Kim HD, Jun HK, Min BM, Lee SH, Choi BK. In-vivo-induced antigenic determinants of Fusobacterium nucleatum subsp. nucleatum. Mol Oral Microbiol 2011; 26:164-72. [DOI: 10.1111/j.2041-1014.2010.00594.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
24
|
Lee HR, Song SH, Kim HB, Park KU, Song J. A rapid genotyping test for the simultaneous detection and subtyping of group B streptococci: the frequency of molecular subtypes of group B streptococci in Korea. Eur J Clin Microbiol Infect Dis 2010; 29:1287-90. [PMID: 20730615 DOI: 10.1007/s10096-010-1025-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2009] [Accepted: 12/17/2009] [Indexed: 11/26/2022]
Affiliation(s)
- H R Lee
- Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul, Korea
| | | | | | | | | |
Collapse
|
25
|
Abstract
A variety of facial scars--erythematous, pigmented, atrophic and hypertrophic--may occur as a result of trauma, surgery, burns and skin disease such as acne. Surgery with other adjunctive methods including radiotherapy, intralesional steroids and pressure therapy have shown variable results. Laser treatment has been attempted for scar revision since the 1980s. The continuous wave lasers, including continuous wave carbon dioxide (CO2), argon and Nd:YAG achieved some improvement; however, their use was limited by the inherent problems of continuous mode lasers. The pulsed dye laser has been successfully used in erythematous and hypertrophic scars. Pigment-specific Q-switched lasers have shown a good improvement for pigmented scars. Skin resurfacing lasers (both CO2 and erbium-YAG) have been used successfully to improve selected atrophic facial scars. The results may be improved by using lasers together with scar subcision and injectable or implantable fillers.
Collapse
Affiliation(s)
- D Sawcer
- Institute of Dermatology, St Thomas' Hospital, London, UK
| | | | | |
Collapse
|
26
|
Lee D, Park HK, Lee H, Cho H, Kim H, Yoon S, Kim B. P025 Gain of 1q as a potential adverse prognostic marker in myelodysplastic syndrome. Leuk Res 2009. [DOI: 10.1016/s0145-2126(09)70105-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
27
|
Rew H, Shin M, Lee H, Jo C, Lee S, Lee B. Effects of Corn Distiller's Dried Grains with Solubles on Production Performance and Economics in Laying Hens. ACTA ACUST UNITED AC 2009. [DOI: 10.5536/kjps.2009.36.1.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
28
|
Kim ST, Jung CW, Lee J, Kwon JM, Oh SY, Park BB, Lee HR, Kim HJ, Kim K, Kim WS, Ahn JS, Kang WK, Park K. New clinical grading system for chronic GVHD predicts duration of systemic immunosuppressive treatment and GVHD-specific and overall survival. Bone Marrow Transplant 2007; 39:711-6. [PMID: 17417662 DOI: 10.1038/sj.bmt.1705661] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We investigated outcomes according to a new clinical grading system for chronic graft-versus-host disease (chronic GVHD) in 38 patients who developed chronic GVHD after an allogeneic hematopoietic stem cell transplantation. We categorized the patients into three grade groups, namely, grade I, grade II and grade III, according to the presence of three risk factors: extensive skin involvement, thrombocytopenia (TP) and progressive type of onset. Sixteen patients were classified into grade 1, 19 into grade II and three into grade III. The probability of withdrawal of systemic immunosuppression (IST) at 1, 2 and 3 years was 61, 76 and 87%, respectively. Patients with grades 2 or 3 chronic GVHD had prolonged duration of systemic IST compared to grade 1 (P=0.043). The probability of GVHD-specific survival (GSS) at 5 years was 52%. Twenty-two of 38 patients with chronic GVHD were still alive and the estimated 3-year overall survival (OS) rate was 60%, whereas that for the group with chronic GVHD grade I and grade II+III was 64 and 48% (P<0.05). Multivariate analysis showed that prior occurrence of acute GVHD, chronic GVHD grade, serum bilirubin over 1.5 mg/dl, date of diagnosis of chronic GVHD (<day 150 versus >day 150) and transplantation-risk factor were independent prognostic factors for GSS and OS.
Collapse
Affiliation(s)
- S T Kim
- Division of Hematology and Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Shin JH, Lee EJ, Lee HR, Ryu SM, Kim HR, Chang CL, Kim YJ, Lee JN. Prevalence of non-tuberculous mycobacteria in a hospital environment. J Hosp Infect 2007; 65:143-8. [PMID: 17174440 DOI: 10.1016/j.jhin.2006.10.004] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [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: 02/06/2006] [Accepted: 10/12/2006] [Indexed: 11/27/2022]
Abstract
In recent years, non-tuberculous mycobacteria (NTM) have emerged as an important cause of opportunistic nosocomial infections but there is little known about the isolation and identification of NTM in Korea. The aim of this study was to assess the prevalence of NTM in the hospital environment and identify the species. A total of 150 samples were collected from different parts of the hospital. NTM were isolated and identified by restriction fragment length polymorphism analysis of the gene encoding rpoB and partial sequencing analysis of hsp65 and rpoB. In this study, 60 strains of NTM were isolated from 50 of the 150 samples. Half of the tap water samples (50 of 100) were positive for mycobacteria. An estimated 73.3% of the isolates were saprophytic, 21.7% were potentially pathogenic and 5% were unidentified. The presence of NTM in hospital tap water is not uncommon. Such water isolates might cause true nosocomial infection in immunocompromised patients, in addition to the risk of false-positive culture results.
Collapse
Affiliation(s)
- J H Shin
- Department of Laboratory Medicine, College of Medicine, Inje University, Inje University Busan Paik Hospital, Busan, Korea.
| | | | | | | | | | | | | | | |
Collapse
|
30
|
Chung DR, Lee SS, Lee HR, Kim HB, Choi HJ, Eom JS, Kim JS, Choi YH, Lee JS, Chung MH, Kim YS, Lee H, Lee MS, Park CK. Emerging invasive liver abscess caused by K1 serotype Klebsiella pneumoniae in Korea. J Infect 2006; 54:578-83. [PMID: 17175028 DOI: 10.1016/j.jinf.2006.11.008] [Citation(s) in RCA: 195] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2006] [Revised: 11/07/2006] [Accepted: 11/07/2006] [Indexed: 12/20/2022]
Abstract
OBJECTIVES The high incidence of invasive liver abscess caused by Klebsiella pneumoniae in Taiwan, contrasted with the rareness of this disease in Western countries, has aroused special interest. There have been few detailed reports from other Asian countries. To investigate a current epidemiology of K. pneumoniae liver abscess in Korea and to determine K serotype distribution in K. pneumoniae strains causing liver abscess, we performed a nationwide prospective study. METHODS Community-acquired, culture-proven liver abscess cases were enrolled between 2004 and 2005. Etiologies and clinical features were analyzed. K. pneumoniae isolates were serotyped according to K antigen. Meta-analysis was done to determine the time trend of the etiologies of liver abscess in Korea. RESULTS Out of 371 cases collected prospectively, 290 (78.2%) were caused by K. pneumoniae. Most K. pneumoniae liver abscesses were monomicrobial. Diabetes mellitus was the most common underlying disease (39.9%). Distant metastatic infections were frequently observed (8.7%). magA PCR revealed that 95 (59.4%) out of 160 K. pneumoniae isolates belonged to the K1 serotype. CONCLUSIONS Our study indicates that K. pneumoniae has emerged as a major etiologic agent of liver abscess in Korea, and these emerging infections seem to be attributable to invasive K. pneumoniae strains with capsular K1 serotype.
Collapse
Affiliation(s)
- D R Chung
- Division of Infectious Diseases, Department of Internal Medicine, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Gyeonggi-do 431-070, South Korea.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Hong YS, Lee HR, Park S, Lee SC, Hwang IG, Park BB, Lee J, Ahn JS, Ahn MJ, Lim HY, Park K. Three-week schedule of irinotecan plus cisplatin in patients with previously untreated extensive-stage small-cell lung cancer. Br J Cancer 2006; 95:1648-52. [PMID: 17133266 PMCID: PMC2360764 DOI: 10.1038/sj.bjc.6603500] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Irinotecan and cisplatin demonstrated promising outcomes in extensive-stage small-cell lung cancer. According to the dosage and schedule of irinotecan, efficacy and toxicity profiles showed subtle differences. This study was designed to evaluate efficacy and toxicity of 3-week schedule of irinotecan/cisplatin in patients with previously untreated extensive-stage small-cell lung cancer. The primary objective was to evaluate response rate and secondary objectives were overall survival and progression-free survival. Patients with previously untreated extensive-stage small-cell lung cancer were enrolled. Irinotecan 65 mg m-2 was administered on days 1 and 8 and cisplatin 60 mg m-2 on day 1. Treatment was repeated every 3 weeks. Seven out of 54 patients (13.0%) had complete response, and partial response was observed in 33 (61.1%). The overall response rate was 74.1% (95% CI; 62.0-82.2%). Stable disease was observed in eight (14.8%) and no progressive disease was observed. After a median follow-up duration of 28.7 months, the median overall survival and progressive-free survival were 13.6 and 6.5 months, respectively. Major grade 3/4 toxicities were neutropenia (50.0%), anorexia (42.6%), diarrhoea (29.6%), fatigue (29.6%) and vomiting (13.0%). There was one treatment-related death owing to pneumonia. Three-week schedule of irinotecan/cisplatin showed effective antitumour activity and moderate toxicities in patients with previously untreated extensive-stage small-cell lung cancer.
Collapse
Affiliation(s)
- Y S Hong
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - H R Lee
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - S Park
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - S C Lee
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - I G Hwang
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - B-B Park
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - J Lee
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - J S Ahn
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - M-J Ahn
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - H Y Lim
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - K Park
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
- Division of Hematology/Oncology, Department of Medicine, Samsung Medical center, Sungkyunkwan University School of Medicine, 50 Irwon-dong Gangnam-gu, Seoul 135-710 Korea. E-mail:
| |
Collapse
|
32
|
Lee J, Kang WK, Kwon JM, Oh SY, Lee HR, Kim HJ, Park BB, Lim HY, Han MJ, Park JO, Park YS. Phase II trial of irinotecan plus oxaliplatin and 5-fluorouracil/leucovorin in patients with untreated metastatic gastric adenocarcinoma. Ann Oncol 2006; 18:88-92. [PMID: 16971670 DOI: 10.1093/annonc/mdl317] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [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: 01/04/2023] Open
Abstract
BACKGROUND This nonrandomized open label phase II study evaluated the efficacy and safety of FOLFOXIRI in metastatic or recurrent gastric cancer patients. PATIENTS AND METHODS Patients with histologically proven, metastatic gastric adenocarcinoma, aged 18-70 years, performance status zero to two, no prior chemotherapy, and with signed written informed consent were eligible. Treatment consisted of irinotecan 150 mg/m2 day 1, oxaliplatin 85 mg/m2 day 1, leucovorin 100 mg/m2 day 1, and 5-fluorouracil 2000 mg/m2 as a 48-h continuous infusion starting on day 1, which was repeated every 2 weeks. RESULTS From August 2004 to August 2005, 48 patients were prospectively enrolled. The median age was 54 years (24-69). In total, 386 cycles were administered with a median of nine cycles per patient (range 1-12 cycles) and 45 of 48 patients were assessable for treatment response. An independent review of tumor responses resulted in overall response rate of 66.7% (95% confidence interval=53.4% to 80.0%) by intent-to-treat analysis with one complete response and 31 partial responses. The median survival of all patients was 14.8 months and the median time to progression was 9.6 months. Most common grade 3/4 toxic effects were neutropenia (12% of all cycles) and emesis (8% of all cycles). Grade 2 peripheral neuropathy occurred in five patients. One (2%) patient had severe tumor bleeding and five (10%) patients experienced grade 3 diarrhea. CONCLUSIONS The modified FOLFOXIRI combination chemotherapy showed a very promising preliminary antitumor activity and was generally well tolerated as a first-line treatment of patients with metastatic gastric cancer.
Collapse
Affiliation(s)
- J Lee
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - W K Kang
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
| | - J M Kwon
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - S Y Oh
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - H R Lee
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - H J Kim
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - B B Park
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - H Y Lim
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - M J Han
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - J O Park
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Y S Park
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| |
Collapse
|
33
|
Kim HJ, Bang SM, Lee J, Kwon HC, Suh C, Kim HJ, Lee JH, Ryoo BY, Park YH, Kwon JM, Oh SY, Lee HR, Kim K, Jung CW, Park K, Kim WS. High-dose chemotherapy with autologous stem cell transplantation in extranodal NK/T-cell lymphoma: a retrospective comparison with non-transplantation cases. Bone Marrow Transplant 2006; 37:819-24. [PMID: 16547486 DOI: 10.1038/sj.bmt.1705349] [Citation(s) in RCA: 128] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
To determine the role of high-dose chemotherapy and autologous stem cell transplantation (HDC/ASCT) in extranodal NK/T-cell lymphoma patients, we conducted a retrospective analysis. In our previous study, we searched for patients who had received HDC/ASCT and identified 16 eligible patients and compared the treatment outcome with historical control group (n=246). Nine patients received HDC/ASCT in the first (CR1) or second complete remission (CR2), while seven patients received HDC/ASCT as salvage. Twelve of 16 patients achieved or maintained CR after HDC/ASCT. Among the 12 patients, five patients relapsed. Estimated 2-year overall survival (OS) and relapse-free survival (RFS) rates were 71.3+/-12.4% and 25.8+/-14.3%, respectively. There was a tendency of better survival in patients who received HDC/ASCT as compared to those who did not (P=0.091). In subset analysis, patients who underwent HDC/ASCT at CR (P=0.049) and patients with stage III or IV (P=0.001) had a favorable outcome. Patients with NKIPI 3,4 or EUNKTL, who underwent HDC/ASCT had more prolonged survival without statistical significance (P=0.055 and 0.056). In conclusion, HDC/ASCT may be considered as a treatment option for patients with extranodal NK/T-cell lymphoma, especially those in CR, with advanced disease (stage III/IV or EUNKTL) and high NKIPI scores.
Collapse
Affiliation(s)
- H J Kim
- Division of Hematology/Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Lee HR, Robinett H, Mitschke D, Lowery St John T, Reyes M, Tamai T. Smoking cessation in Hawaii: implications and future directions. Hawaii Med J 2005; 64:314-5, 325. [PMID: 16438024] [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: 05/06/2023]
Affiliation(s)
- H R Lee
- Department of Speech Communication, Cancer Research Center of Hawaii, University of Hawaii at Manoa, USA
| | | | | | | | | | | |
Collapse
|
35
|
Park J, Lee MH, Lee HR, Park SH, Lee SH, Lee KE, Lee H, Park JO, Kim K, Jung CW, Im YH, Kang WK, Ko YH, Park K. Autologous peripheral blood stem cell transplantation with induction of autologous graft-versus-host disease in acute myeloid leukemia. Bone Marrow Transplant 2003; 32:889-95. [PMID: 14561989 DOI: 10.1038/sj.bmt.1704251] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We studied whether the induction of autologous graft-versus-host disease (GVHD) has an antileukemic effect and consequently increases the survival of patients undergoing autologous peripheral blood stem cell transplantation (PBSCT). In all, 22 acute myeloid leukemia patients with favorable and intermediate cytogenetic risk, in their first complete remission, were administered cyclosporine c.i.v. from day 0 to day +28 at a dose of 3.0 mg/kg per day and interferon-gamma (IFN-gamma) at 0.025 mg/m(2) s.c. every other day from day +14 to day +42 following autologous PBSCT. Natural-killer (NK)-cell activity assays and skin biopsies were performed. Successful engraftment was achieved in all patients at a median of 13 days without significant additional toxicity. Histologically confirmed cutaneous GVHD developed in 12 patients, and NK-cell activity was significantly augmented after autologous PBSCT in those patients (P=0.03). After a median follow-up duration of 37.7 months (range, 7.3-72.8), the 3-year disease-free survival (DFS) and overall survival (OS) rates were 64.4 and 73.1%, respectively, without significant correlation with GVHD status or augmentation of NK-cell activity. These data suggest that the administration of cyclosporine and IFN-gamma following autologous PBSCT improves OS and DFS, which may be attributable to the antileukemic effect, although no difference in survival could be demonstrated between cutaneous GVHD-positive and -negative groups.
Collapse
Affiliation(s)
- J Park
- Division of Hematology/Oncology, Department of Medicine, Seoul, Korea
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Abstract
Diabetic cardiomyopathy has been suggested to be caused by abnormal intracellular Ca2+ homeostasis in the myocardium, which is partly due to a defect in calcium transport by the cardiac sarcoplasmic reticulum (SR). In the present study, the underlying mechanism for this functional derangement was investigated with respect to SR Ca2+-ATPase and phospholamban (the inhibitor of SR Ca2+-ATPase). The maximal Ca2+ uptake and the affinity of Ca2+-ATPase for Ca2+ were decreased, and exogenous phosphorylation level of phospholamban was higher in streptozotocin-induced diabetic rat SR. Levels of both mRNA and protein of phospholamban were significantly increased in the diabetic hearts, whereas those of SR Ca2+-ATPase were significantly decreased. Consequently, the relative phospholamban/Ca2+-ATPase ratio was 1.88 in the diabetic hearts, and these changes were correlated with changes in the rates of SR Ca2+ uptake. However, phosphatase pretreatment of phospholamban for dephosphorylation of the sites phosphorylated in vivo did not change the levels of subsequent phospholamban phosphorylation in either control or diabetic rat hearts. The above data indicated that the increased phospholamban phosphorylation was not due to autonomic dysfunction but possibly due to increased phospholamban expression. These findings suggest that reduction of the SR Ca2+-ATPase level would contribute to decreased rates of SR Ca2+ uptake and that this function is further impaired by the enhanced inhibition by phospholamban due to its increased expression in the diabetic heart.
Collapse
Affiliation(s)
- H W Kim
- Department of Pharmacology, University of Ulsan College of Medicine, Songpa-ku, Seoul, Korea.
| | | | | | | | | |
Collapse
|
37
|
Kim JS, Kim JH, Lee HR, Jung KC, Yun CO. Evaluation of E1B-mutant Replicating Adenoviruses for Cancer Gene Therapy. Cancer Res Treat 2001; 33:500-11. [PMID: 26680830 DOI: 10.4143/crt.2001.33.6.500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
PURPOSE Gene-attenuated replication-competent adenoviruses are emerging as a promising new modality for the treatment of cancer. In an effort to continually improve upon cancer gene therapy, we have modified gene- attenuated replication-competent adenoviruses so as to cause them to replicate efficiently and lyse the infected cancer cells more effectively. MATERIALS AND METHODS We modified the E1 region of the adenovirus (Ad) systematically, generating Ad-deltaE1B19, Ad-deltaE1B55, Ad-deltaE1B19/55, and Ad-WT. The cytopathic effects (CPE) and viral replication of these four gene modified adenoviruses were compared, and the morphology and DNA fragmentation of the infected cells was evaluated. RESULTS Among the constructed adenoviruses, E1B 19kD-inactivated adenovirus (Ad-deltaE1B19) was the most potent, inducing the largest-sized plaques and markedCPE. Moreover, cells infected with Ad-deltaE1B19 showed complete cell lysis with disintegrated cellular structure whereas cells infected with Ad-WT maintained intact cellular and nuclear membrane with properly structured organelles. TUNEL assay was also used to monitor DNA integrity, and a more profound induction of apoptosis was observed in the Ad-deltaE1B19 infected cells in comparison to wild type adenovirus infected cells. CONCLUSION We demonstrate that the inactivation of the E1B19kD gene in a replicating adenovirus leads to increased CPE, rapid viral release, improved cell-to-cell viral spread and increased induction of apoptosis.
Collapse
|
38
|
Abstract
Cancer metastasis accounts for a significant proportion of morbidity and mortality in patients. Effective means of treating disseminated disease remains elusive. The purpose of this study was to determine whether genetically modified endothelial cells (GMEC) can selectively target and deliver recombinant therapeutic molecules to sites of tumor metastases. Following the establishment of lung metastases of 4T1 mammary tumor in mice, intravenously (i.v.) administered, lacZ transgene-expressing endothelial cells (lacZ-GMEC) accumulated at the tumor sites. An average of 32% and 90% of the pulmonary metastases were X-gal stained following one and three tail vein injections of 10(5) lacZ-GMEC, respectively. The linear pattern of X-gal staining seen within the tumor sites and the histological appearance of the tumor vasculature were consistent with the incorporation of lacZ-GMEC into blood vessels. In C57Bl/6 mice harboring lung metastases of melanoma, the administration of three sequential i.v. injections of 10(5) endothelial cells expressing a human interleukin 2 transgene abrogated the tumor metastases and prolonged survival of the animals. These results demonstrate that i.v.-administered GMEC can selectively accumulate, survive, and stably express exogenous genes at multiple tumor sites. These findings support a role for i.v.-administered GMEC as a potential therapeutic strategy for the systemic treatment of cancer metastases.
Collapse
Affiliation(s)
- J O Ojeifo
- Department of Oncology, Georgetown University Medical Center, N.W. Washington, DC 20007, USA
| | | | | | | | | |
Collapse
|
39
|
Yoon YR, Shon JH, Kim MK, Lim YC, Lee HR, Park JY, Cha IJ, Shin JG. Frequency of cytochrome P450 2C9 mutant alleles in a Korean population. Br J Clin Pharmacol 2001; 51:277-80. [PMID: 11298075 PMCID: PMC2015024 DOI: 10.1046/j.1365-2125.2001.00340.x] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.0] [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: 03/17/2000] [Accepted: 11/07/2000] [Indexed: 12/29/2022] Open
Abstract
AIMS To determine the frequencies of CYP2C9 variants in the Korean population and compare them with the frequencies in other ethnic populations. METHODS Genotyping of CYP2C9*2 and CYP2C9*3 allelic variants was carried out in 574 Korean subjects by PCR and restriction fragment length pattern analysis. RESULTS Thirteen of 574 subjects (2.3%) were heterozygous for CYP2C9*3 (Ile359Leu), but no subjects with a CYP2C9*2 allele or homozygous for CYP2C9*3 were identified. The allele frequency of CYP2C9*3 in Korean subjects (0.0113, 95% CI 0.0066-0.0193) was similar to that of other East Asian populations, but was considerably lower than that of Caucasian populations. CONCLUSIONS CYP2C9*3 seems to be an allelic variant related to the functional polymorphism of CYP2C9, but this variant is rarely seen among Koreans compared with Caucasians. Routine genotyping of the CYP2C9*2 allele is considered to be unnecessary in Korean and East Asians, because this allele appears to be extremely rare or absent in these populations.
Collapse
Affiliation(s)
- Y R Yoon
- Department of Pharmacology, Inje University College of Medicine and Clinical Pharmacology Center, Pusan Paik Hospital, Korea
| | | | | | | | | | | | | | | |
Collapse
|
40
|
Abstract
To investigate the effect of nucleotides on cytosolic free calcium mobilization and proliferation activity in HaCaT keratinocytes, nucleotides-induced intracellular free calcium concentration ([Ca(2+)](i)) and cell proliferation observed. [Ca(2+)](i) to the extracellular nucleotides was determined using Ca(2+) sensitive indicator, Fura-2/AM with digital video fluorescence imaging microscopy, and cell proliferation was evaluated by counting of cell number. An adenosine 5'-triphosphate (ATP)-induced [Ca(2+)](i) increase was observed from the concentration of 10(-8) M and was more conspicuous at higher concentrations in a concentration-dependent manner. Additionally, other nucleotides such as ADP, UTP, and 2-me-S-ATP also induced a [Ca(2+)](i) increase in a concentration-dependent manner. However, adenosine induced a slight increase of [Ca(2+)](i) only at 10(-3) M. alpha,-methylene-ATP did not evoke any rise in [Ca(2+)](i). The maximal response observed occurred with ATP and UTP at a concentration of 10(-4) M. The ATP-induced transient [Ca(2+)](i) increase was attenuated by the pretreatment with phospholipase C (PLC) inhibitor, U-73122 (10 microM) for 30 min. ATP-induced [Ca(2+)](i) increase and cell proliferation were inhibited by putative P2Y receptor antagonist, suramin (10(-4) M). When the HaCaT cells were stimulated with nucleotides on a concentration of 10(-4) M and cultured for 5 days, the order of effect on cell proliferation was observed to be ATP>UTP>ADP>2-me-S-ATP. Based on these results, we suggest that extracellular ATP stimulate HaCaT keratinocytes proliferation via purinoceptor-mediated [Ca(2+)](i) mobilization
Collapse
Affiliation(s)
- W K Lee
- Department of Pharmacology, The Catholic University of Korea, 505 Banpo-dong, Seocho-gu, Seoul 137-040, South Korea
| | | | | | | | | | | |
Collapse
|
41
|
Abstract
OBJECTIVES The aim of this study was to describe the clinical, manometric, and serological characteristics of 12 patients with paraneoplastic GI motor dysfunction and to assess the contributory role of diagnostic tests. METHODS Twelve patients diagnosed with malignant tumors and GI motor dysfunction were identified at the Mayo Clinic from 1985 to 1996. RESULTS Cancers identified were: nine small cell lung carcinoma (SCLC), one anaplastic lung adenocarcinoma, one retroperitoneal lymphoma, and one ovarian papillary serous adenocarcinoma. GI symptoms preceded the tumor diagnosis in all cases of SCLC (mean, -8.7 months, range, -1 to -24 months, n = 9). The diagnosis of a malignant tumor preceded the onset of GI symptoms in the three patients with other neoplasms (6, 12, and 24 months). Five of the nine patients found to have SCLC had no evidence of tumor on initial chest x-ray. One or more paraneoplastic autoantibodies were found in 10 of the 11 patients tested by autoimmune serology. Type 1 antineuronal nuclear antibody (ANNA-1 or anti-Hu) was detected in eight of the nine patients with SCLC (one patient was not tested). The patient with ovarian carcinoma had type 1 Purkinje cell cytoplasmic antibody (PCA-1 or anti-Yo). N-type calcium channel antibodies were found in one patient with SCLC, one with a retroperitoneal B cell lymphoma, and one with ovarian carcinoma. Gastric emptying was delayed in 89% (eight of nine tested) and 80% (four of five tested) had esophageal dysmotility. Autonomic reflex tests were abnormal in the seven patients tested. CONCLUSIONS The diagnosis of paraneoplastic GI motor dysfunction requires a high index of clinical suspicion. A panel of serological tests for paraneoplastic autoantibodies, scintigraphic gastric emptying, and esophageal manometry are useful as first-line screening tests. Seropositivity for ANNA-1, PCA-1, or N-type calcium channel-binding antibodies should prompt further evaluation for an underlying malignancy even when routine imaging studies are negative.
Collapse
Affiliation(s)
- H R Lee
- Department of Immunology, Mayo Clinic, Rochester, Minnesota, USA
| | | | | | | |
Collapse
|
42
|
Abstract
OBJECTIVE Viruses are the most common causes of respiratory tract infection in children. We investigated the aetiologies and the epidemiological features of acute viral respiratory tract infections in Korean children. METHODS We tried to isolate respiratory syncytial virus (RSV) and parainfluenza virus from January 1994, influenza virus from February 1995, and adenovirus from April 1996 through August 1998, and identified the isolated viruses by indirect immunofluorescence (IF) staining in the children hospitalized with acute respiratory tract infections (ARTI). RESULTS Virus was identified in 360 of 1389 (25.9%) nasopharyngeal aspirates cultured. Of a total of 392 viruses, 164 (41.8%) RSV, 90 (23%) parainfluenza virus, 66 (16.8%) influenza A virus, 54 (13.8%) adenovirus, and 18 (4.6%) influenza B virus were cultured, including cases in mixed viral infections. The male to female ratio of the culture-positive patients was 2:1, and the proportions of the patients aged >6 months, 6-11 months, 1, 2, 3, 4, 5, 6-7, 8-9, and >10 years were 22.5, 29.5, 25.7, 9.5, 3.8, 3.8, 1.7, 1.7, 1.2, and 0.6%, respectively. The major clinical diagnosis was bronchiolitis for RSV, croup for parainfluenza virus, and pneumonia for adenovirus and influenza virus. Infections by RSV, parainfluenza virus, and influenza virus occurred in annual epidemics, and infections by adenovirus occurred annually with or without epidemics. There were somewhat larger epidemics by adenovirus and influenza virus in May to July 1996 and March to June 1997, respectively. CONCLUSIONS Viral agents are one of the main aetiologies and the main causes of admission in Korean children with ARTI.
Collapse
Affiliation(s)
- M R Kim
- Department of Paediatrics, Hallym University College of Medicine, Seoul, Korea
| | | | | |
Collapse
|
43
|
Abstract
The vegetarians in Taiwan consume diets high in polyunsaturated fatty acids. To investigate whether this dietary pattern results in high susceptibility of LDL to oxidation, 109 long-term (8 +/- 5 y) male and female vegans and lactovegetarians (ages 31-45 y) from Taipei and females from Hualien and matched omnivores were recruited to have 24-h-recall dietary assessments and blood lipid analysis. Body mass index and blood pressure were significantly lower in all vegetarian groups than in the matched omnivore groups (P < 0.05). Vegetarians consumed less energy except in the males and less protein, fat and cholesterol (P < 0.05). The mean polyunsaturated/saturated fatty acid (P/S) ratio of 2.4 in vegetarian diet was about two times that in omnivore diet (P < 0. 001). The concentrations of plasma total- and LDL-cholesterol (LDL-C) but not HDL-cholesterol (HDL-C) were significantly lower (P < 0.001) and resulting HDL-C/LDL-C ratio was 38, 46 and 30% higher (P < 0.01) in Taipei female, male and Hualien female vegetarians, respectively, than in the matched omnivores. Plasma triglyceride concentration was significantly lower only in the Hualien women vegetarians (31%, P < 0.001) than in the matched omnivores. The lag time of conjugated diene formation in LDL oxidized in vitro induced by copper was longer in Taipei female (62%, P < 0.001), male (29%, P < 0.05) and Hualien female (38%, P < 0.01), and the production of thiobarbituric acid reactive substances (TBARS) in LDL after 2-4 h of oxidation was 22-32% less (P < 0.005) in Taipei male and Hualien female vegetarians than the matched omnivores. Lag time of LDL oxidation was negatively related to LDL arachidonic (r = -0.55, P = 0.0003) and eicosapentaenoic (r = -0.47, P = 0.003) acid contents. LDL-TBARS production was negatively related to LDL linoleic acid content (r = -0.36, P = 0.023), but positively related to LDL arachidonic (r = 0.56, P = 0.0002) and eicosapentaenoic (r = 0.45, P = 0.004) acids. No significant differences were found in dietary vitamins C and E intakes and plasma LDL alpha-tocopherol concentrations between vegetarians and omnivores. Our results suggest that vegetarian diets decrease the susceptibility of LDL to oxidation despite their higher dietary P/S ratio.
Collapse
Affiliation(s)
- S C Lu
- Department of Biochemistry, College of Medicine, National Taiwan University, Taipei, Taiwan
| | | | | | | | | | | |
Collapse
|
44
|
Lyons DR, Lindesay JV, Lee HR, Ndlela ZU, Thompson EJ. Modeling and observations of phase-mask trapezoidal profiles with grating-fiber image reproduction. Appl Opt 2000; 39:1077-1083. [PMID: 18337987 DOI: 10.1364/ao.39.001077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We report on an investigation of the trapezoidal design and fabrication defects in phase masks used to produce Bragg reflection gratings in optical fibers. We used a direct visualization technique to examine the nonuniformity of the interference patterns generated by several phase masks. Fringe patterns from the phase masks are compared with the analogous patterns resulting from two-beam interference. Atomic force microscope imaging of the actual phase gratings that give rise to anomalous fringe patterns is used to determine input parameters for a general theoretical model. Phase masks with pitches of 0.566 and 1.059 microm are modeled and investigated.
Collapse
Affiliation(s)
- D R Lyons
- Research Center for Optical Physics, Hampton University, Hampton, Virginia 23668, USA.
| | | | | | | | | |
Collapse
|
45
|
Choi SW, Yang JE, Kang SJ, Lee HR, Kim CW. Herpetic infection on the vulva associated with eccrine squamous syringometaplasia in malignant lymphoma. Acta Derm Venereol 1999; 79:500-1. [PMID: 10598786 DOI: 10.1080/000155599750010193] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
|
46
|
Lee HR, Chang TH, Tebalt MJ, Senderowicz AM, Szabo E. Induction of differentiation accompanies inhibition of Cdk2 in a non-small cell lung cancer cell line. Int J Oncol 1999. [DOI: 10.3892/ijo.15.1.161] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
|
47
|
Lee HR, Chang TH, Tebalt MJ, Senderowicz AM, Szabo E. Induction of differentiation accompanies inhibition of Cdk2 in a non-small cell lung cancer cell line. Int J Oncol 1999; 15:161-6. [PMID: 10375610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023] Open
Abstract
Induction of differentiation in a variety of model systems is accompanied by cell cycle exit and inhibition of Cdk2 kinase activity. We asked whether inhibition of Cdk2 activity is sufficient to allow differentiation to occur in a non-small cell lung cancer cell line. Treatment of NCI-H358 with flavopiridol, an inhibitor of multiple Cdk's, resulted in growth arrest and induction of mucinous differentiation. The onset of differentiation coincided temporally with loss of Cdk2 kinase activity. Western analysis revealed that flavopiridol treatment resulted in depletion of both cyclin E and D1, suggesting that loss of the regulatory subunits is at least partially responsible for the loss of Cdk kinase activity. Similarly, roscovitine, an inhibitor of Cdk's 1, 2, and 5, but not Cdk4, also induced differentiation in NCI-H358, although the resulting pattern of expression of cell cycle regulatory genes differed from the pattern obtained with flavopiridol. Furthermore, stable expression of an antisense Cdk2 construct in NCI-H358 also resulted in the appearance of a marker of mucinous differentiation. These results show that the inhibition of activity of cyclin dependent kinases, particularly Cdk2, by multiple different mechanisms is accompanied by differentiation. Thus, induction of differentiation is one potential mechanism of action for agents that down-regulate Cdk activity.
Collapse
Affiliation(s)
- H R Lee
- Cell and Cancer Biology Department, Medicine Branch, Division of Clinical Sciences, National Cancer Institute, Rockville, MD 20850, USA
| | | | | | | | | |
Collapse
|
48
|
Kemner KM, Yun W, Cai Z, Lai B, Lee HR, Maser J, Legnini DG, Rodrigues W, Jastrow JD, Miller RM, Pratt ST, Schneegurt MA, Kulpa CF. Using zone plates for X-ray microimaging and microspectroscopy in environmental science. J Synchrotron Radiat 1999; 6:639-641. [PMID: 15263407 DOI: 10.1107/s0909049598016586] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/1998] [Accepted: 12/03/1998] [Indexed: 05/24/2023]
|
49
|
Lee HR, Montenegro LM, Nicolson SC, Gaynor JW, Spray TL, Rychik J. Usefulness of intraoperative transesophageal echocardiography in predicting the degree of mitral regurgitation secondary to atrioventricular defect in children. Am J Cardiol 1999; 83:750-3. [PMID: 10080431 DOI: 10.1016/s0002-9149(98)00983-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The objectives of this study were to determine the validity of the grade of mitral regurgitation (MR) as imaged by intraoperative transesophageal echocardiography (TEE) in predicting the grade of MR at follow-up. Intraoperative TEE and corresponding follow-up transthoracic studies were retrospectively reviewed and the regurgitant jet area to left atrial area ratio was used to quantify the MR. Patient records were reviewed to identify factors contributing to the development of a certain grade of MR. Intraoperative TEE was useful in detecting severe MR that required further repair at the same time. However, discrepancy in the grade of MR at follow-up was noted in 47% of patients (21 of 47) and unchanged grade of MR was found only in 53% of patients (26 of 47). Blood pressures were significantly lower and heart rates higher intraoperatively. Initial preoperative grade of MR and type of atrioventricular canal defect did not predispose for a particular grade of MR at follow-up. The grade of MR by intraoperative TEE does not predict the grade of MR at follow-up as imaged by transthoracic echocardiography.
Collapse
Affiliation(s)
- H R Lee
- Division of Cardiology, The Children's Hospital of Philadelphia, Pennsylvania 19104, USA
| | | | | | | | | | | |
Collapse
|
50
|
Park SM, Lee HR, Kim JG, Park JW, Jung G, Han SH, Cho JH, Kim MK. Effect of Helicobacter pylori infection on antral gastrin and somatostatin cells and on serum gastrin concentrations. Korean J Intern Med 1999; 14:15-20. [PMID: 10063309 PMCID: PMC4531904 DOI: 10.3904/kjim.1999.14.1.15] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVES Helicobacter pylori infection induces selective reduction of the number of antral D-cells and results in abnormal regulation of serum gastrin secretion. The purpose of this study was to investigate the relationship between H. pylori infection and the numbers of G-cells and D-cells. METHODS The numbers of antral G-cells and D-cells, the ratio of G-cells to D-cells and fasting serum gastrin concentrations were compared between 37 patients with (29 with duodenal ulcers and 8 with gastric ulcers) and 33 without H. pylori infection (22 with duodenal ulcers and 11 with gastric ulcers). Serum gastrin concentrations were measured using the radioimmunoassay technique. Antral mucosal biopsy specimens were examined using immunohistochemical staining with antibodies specific for gastrin and somatostatin and the numbers of G-cells and D-cells per gastric gland were counted. RESULTS Fasting serum gastrin concentrations were significantly higher in patients with H. pylori infection compared to patients without infection (80.3 +/- 23.5 vs 47.6 +/- 14.1 pg/ml, p < 0.001). The number of G-cells per gastric gland was similar in infected and uninfected patients (7.1 +/- 3.1 vs 7.3 +/- 3.9, respectively, p > 0.5). The number of D-cells was significantly lower in patients with H. pylori infection than in uninfected patients in both duodenal and gastric ulcer patients (1.3 +/- 0.4 vs 2.5 +/- 1.6, respectively, p < 0.001). The ratio of G-cells to D-cells was also significantly higher in infected patients compared with uninfected patients for both gastric and duodenal ulcers (5.7 +/- 2.7 vs 3.5 +/- 1.9, respectively, p < 0.001). CONCLUSIONS These results strongly suggest that Helicobacter pylori infection induces reduction of the number of antral D-cells. The resulting relative hypofunction of the inhibitory action of D-cells against G-cells may be responsible for increased serum gastrin secretion.
Collapse
Affiliation(s)
- S M Park
- Department of Internal Medicine, College of Medicine, Chung-Ang University, Seoul, Korea
| | | | | | | | | | | | | | | |
Collapse
|