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Moses-Payne ME, Lee DG, Roiser JP. Do adolescents use choice to learn about their preferences? Development of value refinement and its associations with depressive symptoms in adolescence. Child Dev 2024. [PMID: 38456563 DOI: 10.1111/cdev.14084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2024]
Abstract
Independent decision making requires forming stable estimates of one's preferences. We assessed whether adolescents learn about their preferences through choice deliberation and whether depressive symptoms disrupt this process. Adolescents aged 11-18 (N = 214; participated 2021-22; Female: 53.9%; White/Black/Asian/Mixed/Arab or Latin American: 26/21/19/9/8%) rated multiple activities, chose between pairs of activities and re-rated those activities. As expected, overall, participants uprated chosen and downrated unchosen activities (dz = .20). This value refinement through choice was not evident in younger participants but emerged across adolescence. Contrary to our predictions, depressive symptoms were associated with greater value refinement. Despite this, more depressed adolescents reported lower value certainty and choice confidence. The cognitive processes through which choice deliberation shapes preference develop over adolescence, and are disrupted in depression.
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Affiliation(s)
| | - D G Lee
- School of Electrical & Electronic Engineering, University College Dublin, Dublin, Ireland
| | - J P Roiser
- UCL Institute of Cognitive Neuroscience, London, UK
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2
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Lee DG, Moon S, Choi J, Wi SJ, Ahn J. Extreme ultraviolet pellicle wrinkles influence on mask 3D effects: experimental demonstration. Appl Opt 2023; 62:6307-6315. [PMID: 37706820 DOI: 10.1364/ao.495649] [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] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 07/21/2023] [Indexed: 09/15/2023]
Abstract
Extreme ultraviolet (EUV) lithography uses reflective optics and a thick mask absorber, leading to mask 3D (M3D) effects. These M3D effects cause disparities in the amplitudes and phases of EUV mask diffractions, impacting mask imaging performance and reducing process yields. Our findings demonstrate that wrinkles in the EUV pellicle can exacerbate M3D effects. This imbalance results in critical dimension variation, image contrast loss, and pattern shift in mask images. Therefore, the use of a pellicle material with thermodynamic characteristics that minimize wrinkles when exposed to EUV rays is imperative.
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Wi SJ, Kim WJ, Kim H, Jeong D, Lee DG, Choi J, Cho SJ, Yu L, Ahn J. Study on ZrSi 2 as a Candidate Material for Extreme Ultraviolet Pellicles. Membranes (Basel) 2023; 13:731. [PMID: 37623792 PMCID: PMC10456829 DOI: 10.3390/membranes13080731] [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] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 08/11/2023] [Accepted: 08/12/2023] [Indexed: 08/26/2023]
Abstract
An extreme ultraviolet (EUV) pellicle is an ultrathin membrane at a stand-off distance from the reticle surface that protects the EUV mask from contamination during the exposure process. EUV pellicles must exhibit high EUV transmittance, low EUV reflectivity, and superior thermomechanical durability that can withstand the gradually increasing EUV source power. This study proposes an optimal range of optical constants to satisfy the EUV pellicle requirements based on the optical simulation results. Based on this, zirconium disilicide (ZrSi2), which is expected to satisfy the optical and thermomechanical requirements, was selected as the EUV pellicle candidate material. An EUV pellicle composite comprising a ZrSi2 thin film deposited via co-sputtering was fabricated, and its thermal, optical, and mechanical properties were evaluated. The emissivity increased with an increase in the thickness of the ZrSi2 thin film. The measured EUV transmittance (92.7%) and reflectivity (0.033%) of the fabricated pellicle satisfied the EUV pellicle requirements. The ultimate tensile strength of the pellicle was 3.5 GPa. Thus, the applicability of the ZrSi2 thin film as an EUV pellicle material was verified.
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Affiliation(s)
- Seong Ju Wi
- Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea; (S.J.W.); (W.J.K.); (H.K.); (D.J.); (D.G.L.)
- EUV-IUCC (Industry University Cooperation Center), Hanyang University, Seoul 04763, Republic of Korea
| | - Won Jin Kim
- Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea; (S.J.W.); (W.J.K.); (H.K.); (D.J.); (D.G.L.)
- EUV-IUCC (Industry University Cooperation Center), Hanyang University, Seoul 04763, Republic of Korea
| | - Haneul Kim
- Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea; (S.J.W.); (W.J.K.); (H.K.); (D.J.); (D.G.L.)
- EUV-IUCC (Industry University Cooperation Center), Hanyang University, Seoul 04763, Republic of Korea
| | - Dongmin Jeong
- Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea; (S.J.W.); (W.J.K.); (H.K.); (D.J.); (D.G.L.)
- EUV-IUCC (Industry University Cooperation Center), Hanyang University, Seoul 04763, Republic of Korea
| | - Dong Gi Lee
- Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea; (S.J.W.); (W.J.K.); (H.K.); (D.J.); (D.G.L.)
- EUV-IUCC (Industry University Cooperation Center), Hanyang University, Seoul 04763, Republic of Korea
| | - Jaehyuck Choi
- R&D Center, FINE SEMITECH CORP, Hwaseong-si 18487, Republic of Korea; (J.C.); (S.J.C.); (L.Y.)
| | - Sang Jin Cho
- R&D Center, FINE SEMITECH CORP, Hwaseong-si 18487, Republic of Korea; (J.C.); (S.J.C.); (L.Y.)
| | - Lan Yu
- R&D Center, FINE SEMITECH CORP, Hwaseong-si 18487, Republic of Korea; (J.C.); (S.J.C.); (L.Y.)
| | - Jinho Ahn
- Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea; (S.J.W.); (W.J.K.); (H.K.); (D.J.); (D.G.L.)
- EUV-IUCC (Industry University Cooperation Center), Hanyang University, Seoul 04763, Republic of Korea
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Park MJ, Lee SE, Yoon W, Park HJ, Kim SH, Oh SH, Lee DG, Pyeon DB, Kim EY, Park SP. Effect of supplementation of cryoprotectant solution with hydroxypropyl cellulose for vitrification of bovine oocytes. Cryo Letters 2023; 44:37-46. [PMID: 36629840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
BACKGROUND Successful cryopreservation of bovine oocytes is very important for research and commercial applications. However, the survival and development rate of vitrified-thawed (VT) oocytes are lower than those of non-vitrified-thawed (non-VT) oocytes. OBJECTIVE To investigate the effect of adding hydroxypropyl cellulose (HPC) to the vitrification solution for bovine oocytes. MATERIALS AND METHODS For vitrification, bovine metaphase II oocytes were pretreated with a solution containing 10% ethylene glycol supplemented with 0, 10, 50, or 100 ug/mL HPC for 5 min, exposed to a solution containing 30% ethylene glycol supplemented with 0, 10, 50, or 100 ug/mL HPC for 30 s, and then directly plunged into liquid nitrogen. RESULTS The survival rate of oocytes was significantly higher in the 50 HPC group than in the 0, 10, and 100 HPC groups. The reactive oxygen species level was lower in the non-VT and 50 HPC groups than in the other groups. The mRNA levels of proapoptotic genes (Bax) were lower in the non-VT, 0, and 50 HPC groups than in the other groups. The mRNA levels of antiapoptotic genes (BCl2) were higher in the non-VT than in the other groups. The development rates of embryos (day 8) obtained via parthenogenetic activation (PA) were determined in the non-VT, 0 HPC, and 50 HPC groups. The cleavage rate was significantly higher in the non-VT group. CONCLUSION Supplementation of vitrification solution with HPC improves the survival of VT bovine oocytes and the development capacity of embryos derived from these oocytes via PA. doi.org/10.54680/fr23110110212.
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Affiliation(s)
- M J Park
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - S E Lee
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - W Yoon
- Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - H J Park
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - S H Kim
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - S H Oh
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - D G Lee
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - D B Pyeon
- Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - E Y Kim
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243; Mirae Cell Bio Inc., Seoul 04795, Korea
| | - S P Park
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243; Mirae Cell Bio Inc., Seoul 04795, Korea.
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Wi SJ, Jang YJ, Lee DG, Kim SY, Ahn J. Investigating the Degradation of EUV Transmittance of an EUV Pellicle Membrane. Membranes (Basel) 2022; 13:membranes13010005. [PMID: 36676812 PMCID: PMC9863476 DOI: 10.3390/membranes13010005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/14/2022] [Accepted: 12/16/2022] [Indexed: 05/27/2023]
Abstract
The extreme ultraviolet (EUV) pellicle is a freestanding membrane that protects EUV masks from particle contamination during EUV exposure. Although a high EUV transmittance of the pellicle is required to minimize the loss of throughput, the degradation of EUV transmittance during the extended exposure of the pellicle has been recently reported. This may adversely affect the throughput of the lithography process. However, the cause of this phenomenon has not yet been clarified. Therefore, we investigated the cause of the degradation in the EUV transmittance by observing the compositional change when the Ru/SiNx pellicle composite was heated in an emulated EUV scanner environment. The Ru thin film that was deposited at high pressure had more void networks but was not oxidized, whereas the SiNx thin film was oxidized after heating. This was because the void network in the Ru thin film served as a preferential diffusion path for oxygen and caused oxidation of the SiNx thin film. It was confirmed that the degradation of the EUV transmittance was due to the oxidation of SiNx. The results verified the effect of diffusivity in the thin film due to the void network on oxidation and EUV transmittance.
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Affiliation(s)
- Seong Ju Wi
- Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea
- EUV-IUCC (Industry University Cooperation Center), Hanyang University, Seoul 04763, Republic of Korea
| | - Yong Ju Jang
- EUV-IUCC (Industry University Cooperation Center), Hanyang University, Seoul 04763, Republic of Korea
- Division of Nanoscale Semiconductor Engineering, Hanyang University, Seoul 04763, Republic of Korea
| | - Dong Gi Lee
- Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea
- EUV-IUCC (Industry University Cooperation Center), Hanyang University, Seoul 04763, Republic of Korea
| | - Seon Yong Kim
- Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea
| | - Jinho Ahn
- Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea
- EUV-IUCC (Industry University Cooperation Center), Hanyang University, Seoul 04763, Republic of Korea
- Division of Nanoscale Semiconductor Engineering, Hanyang University, Seoul 04763, Republic of Korea
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Lee DG, Kim YK, Baek KH. The bHLH Transcription Factors in Neural Development and Therapeutic Applications for Neurodegenerative Diseases. Int J Mol Sci 2022; 23:ijms232213936. [PMID: 36430421 PMCID: PMC9696289 DOI: 10.3390/ijms232213936] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 11/04/2022] [Accepted: 11/08/2022] [Indexed: 11/16/2022] Open
Abstract
The development of functional neural circuits in the central nervous system (CNS) requires the production of sufficient numbers of various types of neurons and glial cells, such as astrocytes and oligodendrocytes, at the appropriate periods and regions. Hence, severe neuronal loss of the circuits can cause neurodegenerative diseases such as Huntington's disease (HD), Parkinson's disease (PD), Alzheimer's disease (AD), and Amyotrophic Lateral Sclerosis (ALS). Treatment of such neurodegenerative diseases caused by neuronal loss includes some strategies of cell therapy employing stem cells (such as neural progenitor cells (NPCs)) and gene therapy through cell fate conversion. In this report, we review how bHLH acts as a regulator in neuronal differentiation, reprogramming, and cell fate determination. Moreover, several different researchers are conducting studies to determine the importance of bHLH factors to direct neuronal and glial cell fate specification and differentiation. Therefore, we also investigated the limitations and future directions of conversion or transdifferentiation using bHLH factors.
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Affiliation(s)
- Dong Gi Lee
- Joint Section of Science in Environmental Technology, Food Technology, and Molecular Biotechnology, Ghent University, Incheon 21569, Korea
| | - Young-Kwang Kim
- Department of Biomedical Science, CHA Stem Cell Institute, CHA University, Seongnam 13488, Korea
| | - Kwang-Hyun Baek
- Department of Biomedical Science, CHA Stem Cell Institute, CHA University, Seongnam 13488, Korea
- Correspondence: ; Tel.: +82-31-881-7134
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Lee DG, Kim YW, Moon S, Ahn J. Effect of wrinkles on extreme ultraviolet pellicle reflectivity and local critical dimension. Appl Opt 2022; 61:5965-5971. [PMID: 36255836 DOI: 10.1364/ao.461413] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Accepted: 06/18/2022] [Indexed: 06/16/2023]
Abstract
Extreme ultraviolet (EUV) pellicles must have an EUV reflectance (EUVR) below 0.04% to prevent the reduction of critical dimension (CD). However, pellicle wrinkles cause localized CD variation by locally amplifying the EUVR. This study demonstrates that wrinkles can increase the pellicle's EUVR by approximately four times, and the CD drop depends on the relative position of the reflected light from the wrinkle to the 0th- or 1st-order diffracted light. The CD decreases by 6 nm. Therefore, even if the pellicle satisfies the requirement for the EUVR, we need to tightly control the generation of wrinkles to suppress CD variation during the entire exposure process.
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Park MJ, Lee SE, Yoon W, Park HJ, Kim SH, Oh SH, Lee DG, Pyeon DB, Kim EY, Park SP. Effect of supplementation of cryoprotectant solution with hydroxypropyl cellulose for vitrification of bovine oocytes. Cryo Letters 2022; 44:37-46. [PMID: 36625874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
BACKGROUND Successful cryopreservation of bovine oocytes is very important for research and commercial applications. However, the survival and development rate of vitrified-thawed (VT) oocytes are lower than those of non-vitrified-thawed (non-VT) oocytes. OBJECTIVE To investigate the effect of adding hydroxypropyl cellulose (HPC) to the vitrification solution for bovine oocytes. MATERIALS AND METHODS For vitrification, bovine metaphase II oocytes were pretreated with a solution containing 10% ethylene glycol supplemented with 0, 10, 50, or 100 ug/mL HPC for 5 min, exposed to a solution containing 30% ethylene glycol supplemented with 0, 10, 50, or 100 ug/mL HPC for 30 s, and then directly plunged into liquid nitrogen. RESULTS The survival rate of oocytes was significantly higher in the 50 HPC group than in the 0, 10, and 100 HPC groups. The reactive oxygen species level was lower in the non-VT and 50 HPC groups than in the other groups. The mRNA levels of proapoptotic genes (Bax) were lower in the non-VT, 0, and 50 HPC groups than in the other groups. The mRNA levels of antiapoptotic genes (BCl2) were higher in the non-VT than in the other groups. The development rates of embryos (day 8) obtained via parthenogenetic activation (PA) were determined in the non-VT, 0 HPC, and 50 HPC groups. The cleavage rate was significantly higher in the non-VT group. CONCLUSION Supplementation of vitrification solution with HPC improves the survival of VT bovine oocytes and the development capacity of embryos derived from these oocytes via PA. doi.org/10.54680/fr23110110212.
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Affiliation(s)
- M J Park
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - S E Lee
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - W Yoon
- Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - H J Park
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - S H Kim
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - S H Oh
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - D G Lee
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - D B Pyeon
- Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243, Korea
| | - E Y Kim
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243; Mirae Cell Bio Inc., Seoul 04795, Korea
| | - S P Park
- Jeju National University Stem Cell Research Center, Seoul 63243; Faculty of Biotechnology, College of Applied Life Sciences, Jeju National University, Jeju 63243; Mirae Cell Bio Inc., Seoul 04795, Korea.
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Kwan BS, Shim SG, Cho DH, Kim KM, Choi IS, Lee DG. Immune response to hepatitis B vaccination and factors associated with poor immune response among healthcare workers. Niger J Clin Pract 2021; 24:795-801. [PMID: 34121724 DOI: 10.4103/njcp.njcp_187_19] [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] [Indexed: 11/04/2022]
Abstract
Background Hepatitis B virus (HBV) infection is a major global health problem, and healthcare workers (HCWs) are at high risk for HBV infection. Current guidelines strongly recommend immunization and screening for high-risk groups. Aims We evaluated immunization and screening for HBV vaccination, assessed post-vaccination immune status of HCW's and characterized potential risk factors associated with poor immune response. Materials and Methods From January 2010 to December 2018, we retrospectively analyzed comprehensive health checkup data for a total of 303 HCWs who received an HBV vaccination. After vaccination, HBV surface antibody (anti-HBs) titers were collected and the distribution of immune response types was determined. Risk factors for poor immune responses were identified using logistic regression. Results A total of 213 HCWs were analyzed after exclusion based on the exclusion criteria. In total, 28 (13.2%) HCWs had anti-HBs titers <100 mIU/mL (hyporesponsive/nonresponsive groups), and 185 (86.8%) had anti-HBs titers ≥100 mIU/mL (hyperresponsive group). Follow-up observations found that 75% (21/28) of the hyporesponsive/nonresponsive groups did not have increased anti-HBs titers or did not maintain an increased response. A multivariate analysis showed that HBV antibody titers at the time of employment were a significant risk factor (OR, 6.12; CI, 1.34-27.93; P = 0.019). Conclusions More attention should be paid to groups that are hyporesponsive/nonresponsive after vaccination and to those with low anti-HBs titers at the beginning of employment. HCWs can be further protected from HBV if their results are discussed at postvaccination follow-ups.
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Affiliation(s)
- B S Kwan
- Department of Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, South Korea
| | - S G Shim
- Department of Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, South Korea
| | - D H Cho
- Department of Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, South Korea
| | - K M Kim
- Department of Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, South Korea
| | - I S Choi
- Department of Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, South Korea
| | - D G Lee
- Department of Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, South Korea
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Mullane KM, Morrison VA, Camacho LH, Arvin A, McNeil SA, Durrand J, Campbell B, Su SC, Chan ISF, Parrino J, Kaplan SS, Popmihajlov Z, Annunziato PW, Cerana S, Dictar MO, Bonvehi P, Tregnaghi JP, Fein L, Ashley D, Singh M, Hayes T, Playford G, Morrissey O, Thaler J, Kuehr T, Greil R, Pecherstorfer M, Duck L, Van Eygen K, Aoun M, De Prijck B, Franke FA, Barrios CHE, Mendes AVA, Serrano SV, Garcia RF, Moore F, Camargo JFC, Pires LA, Alves RS, Radinov A, Oreshkov K, Minchev V, Hubenova AI, Koynova T, Ivanov I, Rabotilova B, Minchev V, Petrov PA, Chilingirov P, Karanikolov S, Raynov J, Grimard D, McNeil S, Kumar D, Larratt LM, Weiss K, Delage R, Diaz-Mitoma FJ, Cano PO, Couture F, Carvajal P, Yepes A, Torres Ulloa R, Fardella P, Caglevic C, Rojas C, Orellana E, Gonzalez P, Acevedo A, Galvez KM, Gonzalez ME, Franco S, Restrepo JG, Rojas CA, Bonilla C, Florez LE, Ospina AV, Manneh R, Zorica R, Vrdoljak DV, Samarzija M, Petruzelka L, Vydra J, Mayer J, Cibula D, Prausova J, Paulson G, Ontaneda M, Palk K, Vahlberg A, Rooneem R, Galtier F, Postil D, Lucht F, Laine F, Launay O, Laurichesse H, Duval X, Cornely OA, Camerer B, Panse J, Zaiss M, Derigs HG, Menzel H, Verbeek M, Georgoulias V, Mavroudis D, Anagnostopoulos A, Terpos E, Cortes D, Umanzor J, Bejarano S, Galeano RW, Wong RSM, Hui P, Pedrazzoli P, Ruggeri L, Aversa F, Bosi A, Gentile G, Rambaldi A, Contu A, Marei L, Abbadi A, Hayajneh W, Kattan J, Farhat F, Chahine G, Rutkauskiene J, Marfil Rivera LJ, Lopez Chuken YA, Franco Villarreal H, Lopez Hernandez J, Blacklock H, Lopez RI, Alvarez R, Gomez AM, Quintana TS, Moreno Larrea MDC, Zorrilla SJ, Alarcon E, Samanez FCA, Caguioa PB, Tiangco BJ, Mora EM, Betancourt-Garcia RD, Hallman-Navarro D, Feliciano-Lopez LJ, Velez-Cortes HA, Cabanillas F, Ganea DE, Ciuleanu TE, Ghizdavescu DG, Miron L, Cebotaru CL, Cainap CI, Anghel R, Dvorkin MV, Gladkov OA, Fadeeva NV, Kuzmin AA, Lipatov ON, Zbarskaya II, Akhmetzyanov FS, Litvinov IV, Afanasyev BV, Cherenkova M, Lioznov D, Lisukov IA, Smirnova YA, Kolomietz S, Halawani H, Goh YT, Drgona L, Chudej J, Matejkova M, Reckova M, Rapoport BL, Szpak WM, Malan DR, Jonas N, Jung CW, Lee DG, Yoon SS, Lopez Jimenez J, Duran Martinez I, Rodriguez Moreno JF, Solano Vercet C, de la Camara R, Batlle Massana M, Yeh SP, Chen CY, Chou HH, Tsai CM, Chiu CH, Siritanaratkul N, Norasetthada L, Sriuranpong V, Seetalarom K, Akan H, Dane F, Ozcan MA, Ozsan GH, Kalayoglu Besisik SF, Cagatay A, Yalcin S, Peniket A, Mullan SR, Dakhil KM, Sivarajan K, Suh JJG, Sehgal A, Marquez F, Gomez EG, Mullane MR, Skinner WL, Behrens RJ, Trevarthe DR, Mazurczak MA, Lambiase EA, Vidal CA, Anac SY, Rodrigues GA, Baltz B, Boccia R, Wertheim MS, Holladay CS, Zenk D, Fusselman W, Wade III JL, Jaslowsk AJ, Keegan J, Robinson MO, Go RS, Farnen J, Amin B, Jurgens D, Risi GF, Beatty PG, Naqvi T, Parshad S, Hansen VL, Ahmed M, Steen PD, Badarinath S, Dekker A, Scouros MA, Young DE, Graydon Harker W, Kendall SD, Citron ML, Chedid S, Posada JG, Gupta MK, Rafiyath S, Buechler-Price J, Sreenivasappa S, Chay CH, Burke JM, Young SE, Mahmood A, Kugler JW, Gerstner G, Fuloria J, Belman ND, Geller R, Nieva J, Whittenberger BP, Wong BMY, Cescon TP, Abesada-Terk G, Guarino MJ, Zweibach A, Ibrahim EN, Takahashi G, Garrison MA, Mowat RB, Choi BS, Oliff IA, Singh J, Guter KA, Ayrons K, Rowland KM, Noga SJ, Rao SB, Columbie A, Nualart MT, Cecchi GR, Campos LT, Mohebtash M, Flores MR, Rothstein-Rubin R, O'Connor BM, Soori G, Knapp M, Miranda FG, Goodgame BW, Kassem M, Belani R, Sharma S, Ortiz T, Sonneborn HL, Markowitz AB, Wilbur D, Meiri E, Koo VS, Jhangiani HS, Wong L, Sanani S, Lawrence SJ, Jones CM, Murray C, Papageorgiou C, Gurtler JS, Ascensao JL, Seetalarom K, Venigalla ML, D'Andrea M, De Las Casas C, Haile DJ, Qazi FU, Santander JL, Thomas MR, Rao VP, Craig M, Garg RJ, Robles R, Lyons RM, Stegemoller RK, Goel S, Garg S, Lowry P, Lynch C, Lash B, Repka T, Baker J, Goueli BS, Campbell TC, Van Echo DA, Lee YJ, Reyes EA, Senecal FM, Donnelly G, Byeff P, Weiss R, Reid T, Roeland E, Goel A, Prow DM, Brandt DS, Kaplan HG, Payne JE, Boeckh MG, Rosen PJ, Mena RR, Khan R, Betts RF, Sharp SA, Morrison VA, Fitz-Patrick D, Congdon J, Erickson N, Abbasi R, Henderson S, Mehdi A, Wos EJ, Rehmus E, Beltzer L, Tamayo RA, Mahmood T, Reboli AC, Moore A, Brown JM, Cruz J, Quick DP, Potz JL, Kotz KW, Hutchins M, Chowhan NM, Devabhaktuni YD, Braly P, Berenguer RA, Shambaugh SC, O'Rourke TJ, Conkright WA, Winkler CF, Addo FEK, Duic JP, High KP, Kutner ME, Collins R, Carrizosa DR, Perry DJ, Kailath E, Rosen N, Sotolongo R, Shoham S, Chen T. Safety and efficacy of inactivated varicella zoster virus vaccine in immunocompromised patients with malignancies: a two-arm, randomised, double-blind, phase 3 trial. The Lancet Infectious Diseases 2019; 19:1001-1012. [DOI: 10.1016/s1473-3099(19)30310-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 05/02/2019] [Accepted: 05/03/2019] [Indexed: 12/25/2022]
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Lee B, Lee DG. Synergistic antibacterial activity of gold nanoparticles caused by apoptosis-like death. J Appl Microbiol 2019; 127:701-712. [PMID: 31216601 DOI: 10.1111/jam.14357] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 06/11/2019] [Accepted: 06/14/2019] [Indexed: 01/06/2023]
Abstract
AIMS Metal nanoparticles are promising materials for the management of infectious diseases as known to have various antimicrobial activities in pathogenic micro-organisms. Among them, gold nanoparticles (AuNPs) are used in a wide range of fields such as photodynamic therapy, molecular diagnostics and drug delivery because of their unique physicochemical properties. However, little is known about the synergistic antibacterial activity and mechanism of AuNPs on pathogenic bacteria. METHODS AND RESULTS Combinations of AuNPs and cefotaxime and ciprofloxacin showed synergistic interaction against all Salmonella species, however the combination with kanamycin exhibited no interaction. We determined that AuNPs and in combinations with antibiotics exert its antibacterial effect through bacterial apoptosis-like death. AuNPs caused collapse of intracellular divalent cation homeostasis, and conventional antibiotics caused accumulation of reactive oxygen species, which induced apoptotic hallmarks such as membrane depolarization, caspase-like protein activation, cell filamentation and phosphatidylserine externalization. CONCLUSIONS The cation homeostasis disruption by AuNPs and the accumulation of reactive oxygen species by conventional antibiotics synergistically affected bacterial cell death and induced apoptosis-like death in Salmonella cells. SIGNIFICANCE AND IMPACT OF THE STUDY The synergistic activity between AuNPs and antibiotics propose that the AuNPs are a potential antibacterial agent and adjuvant for antimicrobial chemotherapy.
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Affiliation(s)
- B Lee
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, Korea
| | - D G Lee
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, Korea
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Kim WS, Lee DG. Primary mixed adenocarcinoma and small-cell carcinoma of appendix: A case report (CARE-compliant). Medicine (Baltimore) 2019; 98:e15614. [PMID: 31083256 PMCID: PMC6531065 DOI: 10.1097/md.0000000000015614] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
RATIONALE Primary extrapulmonary small-cell carcinoma (SCC) of appendix is reported very rarely. We report herein a case of mixed SCC and adenocarcinoma of appendix. PATIENT'S CONCERN A 70-year-old female was consulted to our Emergency Department with the right lower abdominal pain and low-grade fever for 2 days. DIAGNOSIS Abdominal ultrasonography revealed the perforated appendicitis with periappendiceal abscess. Postoperative histology confirmed the diagnosis of mixed SCC and adenocarcinoma. INTERVENTIONS After laparoscopic appendectomy, she underwent right hemicolectomy for radical surgery. OUTCOMES Laparoscopic appendectomy was performed and histological examination showed mixed SCC and adenocarcinoma. After confirming that there was no other organ metastasis, right hemicolectomy was performed for radical surgery. Five months after surgery, the patient expired due to multiple organ metastases. LESSONS Further studies are required for better understanding of disease entities, and clinical trials are needed to define adequate treatment strategies for extrapulmonary SCC.
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Affiliation(s)
| | - Dong Gi Lee
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Hospital Gumi, Gumi, Gyeongsangbuk-do, Republic of Korea
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Abstract
The objectives of this study were to investigate patients treated for scrotal trauma at our institute for the last three decades to describe our experience with an emphasis on the etiologies and ultrasonographic findings in these patients. We reviewed medical records of patients who underwent scrotal ultrasonography for evaluation of testicular trauma at our institutes from 1986 to 2015. Trends regarding the etiology of scrotal trauma were evaluated during each decade. The echo pattern and contour definition of the testicular parenchyma and the pattern of hematoma development were recorded to evaluate radiographic findings of testicular injury. The correlation between ultrasonographic and intraoperative findings was assessed. A total of 115 patients were analyzed. Most patients (92.2%) presented with blunt trauma. The most common etiology of testicular trauma was assault during the first and second decades, while injury related to a fall was most common during the third decade. Of the 77 patients (67.0%) who underwent urgent exploration, 46 patients (59.7%) had testicular rupture. Loss of contour definition, heterogeneous echo pattern of the testicular parenchyma, and testicular hematoma showed a moderate to strong degree of correlation with testicular rupture (Spearman correlation co-efficient: 0.5-0.8). Over the past 30 years, the etiology of testicular injury changed from assault to falls or athletic injury and the severity of injury has decreased. Our findings demonstrate the importance of ultrasonography for determining an appropriate management strategy in scrotal trauma. Surgical exploration should be considered in patients with abnormal ultrasonographic findings.
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Affiliation(s)
- Sang Hyub Lee
- Department of Urology, School of Medicine, Kyung Hee University Hospital at Gangdong, Kyung Hee University, Seoul, Korea
| | - Dong Gi Lee
- Department of Urology, School of Medicine, Kyung Hee University Hospital at Gangdong, Kyung Hee University, Seoul, Korea
| | - Seung Kwon Choi
- Department of Urology, School of Medicine, Kyung Hee University Hospital at Gangdong, Kyung Hee University, Seoul, Korea
| | - Taesoo Choi
- Department of Urology, School of Medicine, Kyung Hee University Hospital at Gangdong, Kyung Hee University, Seoul, Korea
| | - Koo Han Yoo
- Department of Urology, School of Medicine, Kyung Hee University Hospital at Gangdong, Kyung Hee University, Seoul, Korea.
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Lee Y, Lee DG, Lee SH, Yoo KH. Risk Factor Analysis of Ciprofloxacin-Resistant and Extended Spectrum Beta-Lactamases Pathogen-Induced Acute Bacterial Prostatitis in Korea. J Korean Med Sci 2016; 31:1808-1813. [PMID: 27709861 PMCID: PMC5056215 DOI: 10.3346/jkms.2016.31.11.1808] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Accepted: 07/17/2016] [Indexed: 11/20/2022] Open
Abstract
The objectives of this study were to investigate risk factors and the incidence of ciprofloxacin resistance and extended-spectrum beta-lactamases (ESBL) in patients with acute bacterial prostatitis (ABP). We reviewed the medical records of 307 patients who were diagnosed with ABP between January 2006 and December 2015. The etiologic pathogens and risk factors for ciprofloxacin-resistant E. coli and ESBL-producing microbes, susceptibility to ciprofloxacin, and the incidence of ESBL in patients with ABP were described. History of prior urologic manipulation was an independent risk factor for ciprofloxacin-resistant (P = 0.005) and ESBL-producing microbes (P = 0.005). Advanced age (over 60 years) was an independent risk factor for ciprofloxacin-resistant microbes (P = 0.022). The ciprofloxacin susceptibility for Escherichia coli in groups without prior manipulation was documented 85.7%. For groups with prior manipulation, the susceptibility was 10.0%. Incidence of ESBL-producing microbes by pathogen was 3.8% for E. coli and 1.0% for Klebsiella pneumonia in the absence of manipulation group, and 20% and 33.3% in the presence of manipulation group, respectively. Initial treatment of ABP must consider patient's age and the possibility of prior manipulation to optimize patient treatment. With the high rate of resistance to fluoroquinolone, cephalosporins with amikacin, or carbapenems, or extended-spectrum penicillin with beta lactamase inhibitor should be considered as the preferred empirical ABP treatment in the patients with history of prior urologic manipulation.
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Affiliation(s)
- Young Lee
- Department of Urology, Kyung Hee University School of Medicine, Seoul, Korea
| | - Dong Gi Lee
- Department of Urology, Kyung Hee University School of Medicine, Seoul, Korea
| | - Sang Hyub Lee
- Department of Urology, Kyung Hee University School of Medicine, Seoul, Korea
| | - Koo Han Yoo
- Department of Urology, Kyung Hee University School of Medicine, Seoul, Korea.
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Hsu LY, Lee DG, Yeh SP, Bhurani D, Khanh BQ, Low CY, Norasetthada L, Chan T, Kwong YL, Vaid AK, Alejandria I, Mendoza M, Chen CY, Johnson A, Tan TY. Epidemiology of invasive fungal diseases among patients with haematological disorders in the Asia-Pacific: a prospective observational study. Clin Microbiol Infect 2015; 21:594.e7-11. [PMID: 25749561 DOI: 10.1016/j.cmi.2015.02.019] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [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: 11/23/2014] [Revised: 01/12/2015] [Accepted: 02/22/2015] [Indexed: 12/15/2022]
Abstract
We conducted a 2-year multicentre prospective observational study to determine the epidemiology of and mortality associated with invasive fungal diseases (IFDs) among patients with haematological disorders in Asia. Eleven institutions from 8 countries/regions participated, with 412 subjects (28.2% possible, 38.3% probable and 33.5% proven IFDs) recruited. The epidemiology of IFDs in participating institutions was similar to Western centres, with Aspergillus spp. (65.9%) or Candida spp. (26.7%) causing the majority of probable and proven IFDs. The overall 30-day mortality was 22.1%. Progressive haematological disorder (odds ratio [OR] 5.192), invasive candidiasis (OR 3.679), and chronic renal disease (OR 6.677) were independently associated with mortality.
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Affiliation(s)
- L Y Hsu
- National University Hospital, National University Health System, Singapore.
| | - D G Lee
- Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - S P Yeh
- China Medical University Hospital, Taiwan
| | - D Bhurani
- Rajiv Gandhi Cancer Institute and Research Centre, New Delhi, India
| | - B Q Khanh
- National Institute of Hematology and Blood Transfusion, Hanoi, Viet Nam
| | - C Y Low
- Singapore General Hospital, Singapore
| | | | - T Chan
- Queen Mary Hospital, Hong Kong Special Administrative Region, China
| | - Y L Kwong
- Queen Mary Hospital, Hong Kong Special Administrative Region, China
| | - A K Vaid
- Maedanta Medicity, Gurgaon, India
| | - I Alejandria
- National Kidney and Transplant Institute, Quezon City, Philippines
| | - M Mendoza
- National Kidney and Transplant Institute, Quezon City, Philippines
| | - C Y Chen
- National Taiwan University Hospital, Taiwan
| | - A Johnson
- International Health Management Associates, Inc., Schaumburg, IL, USA
| | - T Y Tan
- Changi General Hospital, Singapore
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Lee DG, Kesavulu CR, Yi SS, Cho S, Jang K, Kim SH, Jeong JH. Photoluminescence properties of Na(Sr,Ca)VO4:Eu(3+) phosphors. J Nanosci Nanotechnol 2014; 14:5877-5880. [PMID: 25936019 DOI: 10.1166/jnn.2014.8317] [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] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Eu(3+)-activated novel alkaline earth metal (Sr and Ca) vanadate phosphors, Na(Sr(0.97-x), Ca(x))VO4:Eu0.03(3+) (x = 0 to 0.97) has been successfully synthesized using solid state reaction method and characterized by XRD, XPS, FE-SEM, luminescence (PLE, PL and CIE coordinate) and decay rate measurements as a function of Ca ion concentration. Phosphors show a broad excitation band (monitored for (5)D0 --> (7)F2 transition of Eu(3+)) in the 230-430 nm wavelength regions which make them highly suitable for LED chips. Material gives strong emission of Eu(3+) ion (λex = 323 nm) and intensity of this emission increases with increase in the doping concentration of Ca ions until a maximum is reached for Na(Sr0.22, Ca0.75)VO4:Eu0.03(3+) (x = 0.75) phase phosphor. The intensity ratio of (5)D0 --> (7)F2 to (5)D0 --> (7)F1 transition (monochromaticity, R) suggest that local symmetry around the Eu(3+) ion increases with increase in Ca ion concentration, which is responsible for enhanced emission.
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Zhao LB, Shi HB, Park S, Lee DG, Shim JH, Lee DH, Suh DC. Acute bleeding in the head and neck: angiographic findings and endovascular management. AJNR Am J Neuroradiol 2013; 35:360-6. [PMID: 24136646 DOI: 10.3174/ajnr.a3761] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND AND PURPOSE Life-threatening bleeding in the head and neck requires urgent management. This study evaluated the angiographic findings related to head and neck bleeding and presents endovascular management techniques. MATERIAL AND METHODS Sixty-one consecutive patients who presented with acute bleeding in the head and neck areas and subsequently underwent endovascular therapy between January 2002 and October 2012 were included in our study. We evaluated the angiographic findings, techniques, and results of endovascular management. RESULTS Contrast leakage (n = 10), pseudoaneurysm (n = 20), or both (n = 10) were the most common life-threatening angiographic findings (66%) and were the foci of immediate embolization or endoluminal vessel reconstruction. Seventeen patients (28%) had hypervascular staining of the tumor or mucosa, and 4 patients (6%) did not have any abnormal findings. The acute bleeding was successfully controlled by endovascular management according to the bleeding foci. Carotid arterial lesions, so-called "carotid blowout," required reconstructive or deconstructive therapy. Bleeding of the external carotid artery required specific branch embolization by a combination of various embolic materials. No procedure-related complications occurred except in 1 patient who experienced acute infarction caused by thromboemboli from the covered stent. Seventeen patients (28%) were retreated due to rebleeding after the mean 20-month follow-up. CONCLUSIONS Contrast leakage or a pseudoaneurysm or both seen on angiography are active bleeding foci and targets for therapy in patients with acute bleeding in the head and neck area. Despite different bleeding-control strategies according to vessel involvement, endovascular treatment is safe and effective for controlling hemorrhage.
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Affiliation(s)
- L-B Zhao
- From the Departments of Radiology and Research Institute of Radiology (L.-B.Z., H.B.S., S.P., D.-g.L., J.H.S., D.H.L., D.C.S.), University of Ulsan, College of Medicine, Asan Medical Center, Seoul, Korea
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Lee DG, Singh SK, Moon CH, Yi SS, Jang K, Shin DS, Jeong JH, Bae JS. Photoluminescence properties of NaSr(P, V)O4:Eu3+ phosphors. J Nanosci Nanotechnol 2013; 13:5552-5555. [PMID: 23882793 DOI: 10.1166/jnn.2013.7068] [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: 06/02/2023]
Abstract
Eu3+ activated NaSr(P,V)O4 phosphors have been synthesized using solid state reaction method and further characterized for their structure and optical properties using different techniques such as X-ray diffraction, scanning electron microscopy, photolumniscenec excitation, emission, and chromaticity coorrdinate analysis, etc. Material shows a broad excitation peak (monitored for lambda(ems) = 613 nm) lying in the 300-360 nm region and gives intense transitions (lambda(exc) = 320 nm) namely 5D0 --> 7F1 at 590 nm, 5D0 --> 7F2 at 613 nm, 5D0 --> 7F3 at 650 nm, and 5D0 --> 7F4 at 700 nm due to Eu3+ ion. Our results show that replacement of the PO4(3-) ions with isomorphic VO4(3-) ions improves the structural stability and the overall intensity of the emission. The maxium emission intensity is achieved for the NaSr(P0.4, V0.6)O4:Eu3+ phosphor. An estimated increase of an order is attained for the NaSr(P0.4, V0.6)O4:Eu3+ phosphor as compared to NaSrPO4:Eu3+ or NaSrVO4:Eu3+ phosphor. The chromaticity coordinate of the phosphor (0.68, 0.31) lies well within the red region and suggest that the material could be an alternative red phosphor for lighting and display applications.
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Affiliation(s)
- Dong Gi Lee
- Department of Electronic Materials Engineering, Silla University, Busan 617-736, Republic of Korea
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Lee DG, Kim DK, Moon YJ, Moon SJ. Effect of laser-induced temperature field on the characteristics of laser-sintered silver nanoparticle ink. Nanotechnology 2013; 24:265702. [PMID: 23732285 DOI: 10.1088/0957-4484/24/26/265702] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Laser sintering of metal nanoparticles is a key technology for high-performance printed electronics fabricated on heat-sensitive substrates such as glass or plastic. Although laser-sintered electronic devices have been successfully fabricated, the role of the induced temperature field in the laser sintering process has not been reported thus far. In this work, the effect of temperature on the laser sintering process is described for the first time using a two-dimensional transient heat conduction equation for inkjet-printed silver nanoparticle ink. The in situ electrical resistance was measured to estimate the transient thermal conductivity and hence the temperature of the sintered ink during the laser sintering process. To verify the estimated laser sintering temperature, the morphology of furnace-sintered silver nanoparticle ink was compared with that of laser-sintered ink. The electrical characteristics and surface morphology of laser-sintered ink are found to be related to the process temperature.
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Affiliation(s)
- D G Lee
- Department of Mechanical Engineering, Hanyang University, Seoul 133-791, Korea
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Han SB, Bae EY, Lee JW, Lee DG, Chung NG, Jeong DC, Cho B, Kang JH, Kim HK. Clinical characteristics and antibiotic susceptibility of viridans streptococcal bacteremia in children with febrile neutropenia. Infection 2013; 41:917-24. [PMID: 23640200 DOI: 10.1007/s15010-013-0470-7] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2013] [Accepted: 04/22/2013] [Indexed: 10/26/2022]
Abstract
PURPOSE This retrospective study was performed in order to investigate the clinical characteristics and antibiotic susceptibility of viridans streptococcal bacteremia (VSB) in febrile neutropenic children in the context of the increase in incidence and antibiotic resistance of VSB. METHODS We conducted this study among neutropenic children with underlying hematology/oncology diseases who were diagnosed with VSB at a single institution from April 2009 to June 2012. Clinical and laboratory characteristics of the children as well as antibiotic susceptibility of the causative viridans streptococci were evaluated. RESULTS Fifty-seven episodes of VSB were diagnosed in 50 children. Severe complications occurred in four children (7.0%), and a death of one child (1.8%) was attributable to VSB. Acute myeloid leukemia was the most common underlying disease (70.2% of all cases), and 71.9% of all cases received chemotherapy including high-dose cytarabine. VSB occurred at a median of 13 days (range 8-21 days) after the beginning of chemotherapy, and fever lasted for a median of 4 days (range 1-21 days). The C-reactive protein level significantly increased within a week after the occurrence of VSB (p < 0.001) and the maximum C-reactive protein level showed a positive correlation with fever duration (r = 0.362, p = 0.007). Second blood cultures were done before the use of glycopeptides in 33 children, and negative results were observed in 30 children (90.9%). Susceptibilities to cefotaxime, cefepime, and vancomycin were 58.9, 69.1, and 100%, respectively. CONCLUSIONS Severe complications of VSB in neutropenic febrile children were rare. We suggest glycopeptide use according to the results of blood culture and antibiotic susceptibility tests based on the susceptibility to cefepime and the microbiologic response to empirical antibiotic treatment not including glycopeptides in this study.
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Affiliation(s)
- S B Han
- Department of Pediatrics, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 222, Banpo-daero, Seocho-gu, Seoul, Republic of Korea
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Lee DG, Lee JH, Choi BK, Kim MJ, Kim SM, Kim KS, Chang K, Park SH, Bae YS, Kwon BS. H⁺-myo-inositol transporter SLC2A13 as a potential marker for cancer stem cells in an oral squamous cell carcinoma. Curr Cancer Drug Targets 2012; 11:966-75. [PMID: 21861841 DOI: 10.2174/156800911797264752] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2010] [Revised: 03/08/2011] [Accepted: 06/22/2011] [Indexed: 11/22/2022]
Abstract
Cancer Stem Cells (CSCs) from tumors of different phenotypes possess a marked capacity for proliferation, self-renewal, and differentiation. They also play a critical role in cancer recurrence. Although CSC has been regarded as a new target for cancer therapy, the fundamental questions in the CSC study have not been resolved mainly due to the lack of proper CSC markers. To find new CSC markers for oral squamous cell carcinoma (OSCC), we cultured the primary tumor cells from OSCC patients the regular culture condition and the sphere-forming culture condition to enrich primary tumor cells and potential CSCs. We compared gene expression profiles between sphere-forming and non-forming cells, thus identifying that 23 membrane protein-coding genes were over-expressed in the sphere-forming cells. Among them, 8 belonged to the solute carrier (SLC) protein family. H⁺-myo-inositol transporter SLC2A13 and monocarbohydrate transporter SLC16A6 genes that were consistently increased in the sphere-forming cells in the primary cultures of OSCC samples. Confocal microscopy revealed that SLC2A13-expressing cells were embedded in the limited areas of tumor tissue as a cluster, while SLC16A6 was uniformly detected in hyperplastic epithelium. Moreover, SLC2A13 an expression was induced in human breast adenocarcinoma MCF7 cells after serum starvation. Taken together, our results suggest that SLC2A13 can be a potential markers for CSC in various tumors.
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Affiliation(s)
- D G Lee
- Immune & Cell Therapy Branch, Division of Cancer Biology, National Cancer Center, 809 Madu, Ilsan, Goyang, Kyeonggi-do, 410-769, Korea
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Lee DG, Kim GH, Park DY, Jeong JH, Moon JY, Lee BE, Hosuk I, Song GA. Endoscopic submucosal resection of esophageal subepithelial lesions using band ligation. Endoscopy 2011; 43:822-5. [PMID: 21818736 DOI: 10.1055/s-0030-1256615] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [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] [Indexed: 12/31/2022]
Abstract
Subepithelial lesions (SELs) are occasionally found in the esophagus during upper endoscopy. Sometimes endoscopic resection is needed for accurate diagnosis or in the rare cases of malignant transformation of SELs. In this case series, we evaluated the usefulness of endoscopic submucosal resection with a ligation device (ESMR-L) in esophageal SELs. Twenty-three patients with 25 esophageal SELs that were no larger than 13 mm and were localized within the muscularis mucosae or submucosa were enrolled. ESMR-L was successfully performed in all 25 SELs. The en bloc resection rate was 100% (25/25), and histologically complete resection was achieved in 24 lesions (24/25, 96%). After resection of the lesion by snare, minor immediate bleeding occurred in four cases, but there was no delayed bleeding or perforation.
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Affiliation(s)
- D G Lee
- Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea
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Park YW, Lee JW, Lee DG. Traumatic Extrapleural Hematoma Mimicking a Hemothorax. Korean J Thorac Cardiovasc Surg 2010. [DOI: 10.5090/kjtcs.2010.43.3.328] [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] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Young-Woo Park
- Department of Thoracic and Cardiovascular Surgery, Korea Veterans Hospital
| | - Jae-Wook Lee
- Department of Thoracic and Cardiovascular Surgery, Soonchunhyang Gumi University Hospital, College of Medicine, Soonchunyang University
| | - Dong Gi Lee
- Department of Anesthesiology and Pain Medicine, Soonchunhyang Gumi University Hospital, College of Medicine, Soonchunyang University
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Lee DG, Lee SK, Chang HW, Kim JY, Lee HJ, Lee SM, Kwon JH, Woo S. CT features of lobular capillary hemangioma of the nasal cavity. AJNR Am J Neuroradiol 2009; 31:749-54. [PMID: 20007721 DOI: 10.3174/ajnr.a1908] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Lobular capillary hemangioma is a benign capillary proliferation of unknown etiology. To our knowledge, no comprehensive review of imaging findings of LCHNC has been presented. Thus, we investigated characteristic CT features of LCHNC. MATERIALS AND METHODS This retrospective study included 6 patients (2 men and 4 women; age range, 30-65 years; mean age, 49.2 years) with histologically proved LCHNC. We evaluated the size, site of origin, attenuation on NECT, degree and pattern of enhancement, and bony changes. RESULTS The LCHNC lesion was 13.0-45.0 mm (average, 25.0 mm) in diameter. These lesions arose from the inferior turbinate in 5 (83.3%) patients and the anterior nasal septum in 1 (16.7%). Compared with the masticator muscles, the LCHNC lesion was hypoattenuating in 2 (33.3%) and isoattenuating on NECT in 4 (66.7%) patients. In 5 (83.3%) patients, the LCHNC lesion consisted of 2 distinct areas on CECT: a lobular intensely enhancing mass and an iso- or hypoattenuating cap of variable thickness around the intensely enhancing mass. Bony changes included erosion in 3 (50.0%) and displacement in 2 (33.3%) patients. CONCLUSIONS CT features of LCHNC consist of an intensely enhancing mass and an iso- or hypoattenuating cap on CECT. The inferior turbinate seems to be a common site of origin, and bony changes are not uncommon features of LCHNC. CT is useful not only in identifying the site of origin and assessing the extent but also in suggesting the nature of LCHNC.
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Affiliation(s)
- D G Lee
- Department of Radiology, Dongsan Medical Center, Keimyung University School of Medicine, Daegu, South Korea
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Park K, Lee DG, Kim SW, Paick JS. Dimethylarginine dimethylaminohydrolase in rat penile tissue: reduced enzyme activity is responsible for erectile dysfunction in a rat model of atherosclerosis. Int J Impot Res 2009; 21:228-34. [PMID: 19603041 PMCID: PMC2834501 DOI: 10.1038/ijir.2009.20] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [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: 11/09/2022]
Abstract
Asymmetric dimethylarginine (ADMA), an endogenous inhibitor of nitric oxide synthase (NOS), is mainly metabolized by N(G),N(G)-dimethylarginine dimethylaminohydrolase (DDAH). We investigated whether altered cavernosal ADMA-DDAH metabolism might cause impairment of erection in rat model of atherosclerosis (AS). Male Sprague-Dawley rats (3 months old) were divided into an AS group and a normal control (Con) group (n=20 in each group). The AS rats received AS-prone treatment (6 weeks of 1% cholesterol diet plus early 2 weeks of N(G)-nitro-L-arginine methyl ester (3 mg ml(-1) per day) treatment). After 6 weeks, rats underwent cavernosometry measuring the maximal intracavernosal pressure/mean arterial pressure (ICP/MAP) ratios as a surrogate marker of erectile function. The amount of cavernosal ADMA was assessed by immunoblot analysis and correlated with the ICP/MAP. Isoform-specific DDAH expression was compared by immunohistochemistry. Cavernosal DDAH and NOS activity were measured. Cavernosal malondialdehyde levels were assayed to determine the degree of lipid peroxidation. Compared to the controls, the AS rats had signs of impaired erectile function. Higher cavernosal ADMA was observed in the AS rats. The cavernosal ADMA had a moderately negative correlation with the ICP/MAP. Immunohistochemistry revealed the expression of both isoforms was not affected by the presence of AS. However, significantly diminished DDAH as well as NOS activity was observed in the AS group. In addition, elevated cavernosal malondialdehyde levels were noted in the AS rats. Our study showed that decreased cavernosal DDAH activity is the cause of cavernosal ADMA accumulation leading to reduced cavernosal NOS activity and impairment of erectile function.
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Affiliation(s)
- K Park
- Department of Urology, Korea Cancer Center Hospital, Seoul, Korea
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Jeon IS, Kim SB, Lee DG, Park JG, Bae SC. Bilateral symmetric lacerations of the soft palate after general anesthesia using the laryngeal mask airway ProSeal(TM): A case report. Korean J Anesthesiol 2009; 56:438-442. [PMID: 30625767 DOI: 10.4097/kjae.2009.56.4.438] [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] [Indexed: 11/10/2022] Open
Abstract
ProSeal(TM) laryngeal mask airway (PLMA) was developed to be more effective especially with glottic airway sealing and is suppose to be an improved device over the classic laryngeal mask airway (cLMA). The PLMA's cuff is bulkier, softer, and more pliable than the cLMA. We reviewed a case were a patient had hand surgery under general anesthesia using the PLMA. After having the hand surgery, the patient suffered from dyspnea and had difficulty with their respirations at a supine position. The problems with dyspnea and respiration after surgery resulted because of difficulties from inserting PLMA No.5 into the patient. We suspect from this case that the problems in dyspnea and respiration were due to the folded cuff and incomplete placement of the PLMA, which resulted in lacerations of the mucosa in the soft palate of the patient. In this paper, we considered the probable causes for lacerations of the mucosa in the soft palate and reviewed all of the relevant literature, especially about the proper placement of the PLMA.
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Affiliation(s)
- In Suk Jeon
- Department of Anesthesiology and Pain Medicine, College of Medicine, Soonchunhyang University, Gumi, Korea.
| | - Sang Baek Kim
- Department of Anesthesiology and Pain Medicine, College of Medicine, Soonchunhyang University, Gumi, Korea.
| | - Dong Gi Lee
- Department of Anesthesiology and Pain Medicine, College of Medicine, Soonchunhyang University, Gumi, Korea.
| | - Jin Gue Park
- Department of Anesthesiology and Pain Medicine, College of Medicine, Soonchunhyang University, Gumi, Korea.
| | - Sang Cheul Bae
- Department of Anesthesiology and Pain Medicine, College of Medicine, Soonchunhyang University, Gumi, Korea.
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Abstract
BACKGROUND Thyroid surgery is usually performed under general anesthesia, but thyroid surgery under monitored anesthesia care (MAC) has become re-introduced. We report our experiences of 40 cases of thyroid surgery under MAC. METHODS Forty patients were enrolled in this study. Bilateral superficial cervical plexus block (BSCPB) was performed by using 1% mepivacaine with 1 : 200,000 epinephrine. After BSCPB, patients were sedated with propofol and fentanyl. Postoperative pain, sore throat, hoarseness, and postoperative nausea and vomiting (PONV) were assessed. RESULTS Mean postoperative pain VAS were 1.3, 1.2, 1.0, 0.8 and postoperative sore throat VAS 1.4, 1.4, 1.1, 0.9 at PACU (post-anesthesia care unit) and postoperative 3, 6, 12 h, respectively. The incidence of hoarseness was 25, 5, 2.5%, and 0% and PONV were 0, 5, 10%, and 7.5% at PACU and postoperative 3, 6, 12 h, respectively. CONCLUSIONS Thyroid surgery under MAC may be a suitable alternative to general anesthesia.
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Affiliation(s)
- Joon Ho Lee
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Hospital, Bucheon, Korea.
| | - Jae Hwa Yoo
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Hospital, Bucheon, Korea.
| | - Sung Hwan Cho
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Hospital, Bucheon, Korea.
| | - Sang Hyun Kim
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Hospital, Bucheon, Korea.
| | - Won Seok Chae
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Hospital, Bucheon, Korea.
| | - Dong Gi Lee
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Hospital, Bucheon, Korea.
| | - Hee Cheol Jin
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Hospital, Bucheon, Korea.
| | - Yong Ik Kim
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Hospital, Bucheon, Korea.
| | - Yoon Woo Koh
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Hospital, Bucheon, Korea.
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Yahya R, Bavanandan S, Yap YC, Jazilah W, Shaariah W, Wong HS, Lee DG. Report of the Malaysian Registry of Renal Biopsy (MRRB). Med J Malaysia 2008; 63 Suppl C:18-19. [PMID: 19230242] [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: 05/27/2023]
Affiliation(s)
- R Yahya
- Malaysian Registry of Renal Biopsy, 2nd Floor, MMA House, 124, Jalan Pahang, 50286 Kuala Lumpur, Malaysia
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Lim YN, Lim TO, Lee DG, Wong HS, Ong LM, Shaariah W, Rozina G, Morad Z. A report of the Malaysian dialysis registry of the National Renal Registry, Malaysia. Med J Malaysia 2008; 63 Suppl C:5-8. [PMID: 19230240] [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: 05/27/2023]
Abstract
The Malaysian National Renal Registry was set up in 1992 to collect data for patients on renal replacement therapy (RRT). We present here the report of the Malaysian dialysis registry. The objectives of this papar are: (1) To examine the overall provision of dialysis treatment in Malaysia and its trend from 1980 to 2006. (2) To assess the treatment rate according to the states in the country. (3) To describe the method, location and funding of dialysis. (4) To characterise the patients accepted for dialysis treatment. (5) To analyze the outcomes of the dialysis treatment. Data on patients receiving dialysis treatment were collected at initiation of dialysis, at the time of any significant outcome, as well as yearly. The number of dialysis patients increased from 59 in 1980 to almost 15,000 in 2006. The dialysis acceptance rate increased from 3 per million population in 1980 to 116 per million population in 2006, and the prevalence rate from 4 to 550 per million population over the same period. The economically advantaged states of Malaysia had much higher dialysis treatment rates compared to the less economically advanced states. Eighty to 90% of new dialysis patients were accepted into centre haemodialysis (HD), and the rest into the chronic ambulatory peritoneal dialysis (CAPD) programme. The government provided about half of the funding for dialysis treatment. Patients older than 55 years accounted for the largest proportion of new patients on dialysis since the 1990s. Diabetes mellitus has been the main cause of ESRD and accounted for more than 50% of new ESRD since 2002. Annual death rate averaged about 10% on HD and 15% on CAPD. The unadjusted 5-year patient survival on both HD and CAPD was about 80%. Fifty percent of dialysis patients reported very good median QoL index score. About 70% of dialysis patients were about to work full or part time. There has been a very rapid growth of dialysis provision in Malaysia particularly in the older age groups. ESRD caused by diabetes mellitus, despite being a preventable and treatable cause of ESRD--has increased and accounted for more than 50% of incident dialysis patients. Death and survival rates on dialysis are comparable to those from other countries.
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Affiliation(s)
- Y N Lim
- National Renal Registry Malaysia, 2nd Floor, MMA House, 124, Jalan Pahang, 50286 Kuala Lumpur, Malaysia
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Park SY, Koo BS, Lee JH, Cho SH, Kim SH, Chae WS, Lee DG, Jin HC, Lee JS, Kim YI. Effects of thoracic epidural anesthesia on hemodynamic changes during tracheal intubation. Korean J Anesthesiol 2008. [DOI: 10.4097/kjae.2008.55.4.429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Sun Young Park
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, College of Medicine, Soonchunhyang University, Bucheon, Korea
| | - Bon Sung Koo
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, College of Medicine, Soonchunhyang University, Bucheon, Korea
| | - Joon Ho Lee
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, College of Medicine, Soonchunhyang University, Bucheon, Korea
| | - Sung Hwan Cho
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, College of Medicine, Soonchunhyang University, Bucheon, Korea
| | - Sang Hyun Kim
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, College of Medicine, Soonchunhyang University, Bucheon, Korea
| | - Won Seok Chae
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, College of Medicine, Soonchunhyang University, Bucheon, Korea
| | - Dong Gi Lee
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Gumi Hospital, College of Medicine, Soonchunhyang University, Gumi, Korea
| | - Hee Cheol Jin
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, College of Medicine, Soonchunhyang University, Bucheon, Korea
| | - Jeong Seok Lee
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, College of Medicine, Soonchunhyang University, Bucheon, Korea
| | - Yong Ik Kim
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, College of Medicine, Soonchunhyang University, Bucheon, Korea
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Kim SH, Kim KN, Lee DG, Chae WS, Kim YI. Follow-up Evaluation of the Effect of Stellate Ganglion Block Using Thermography -A case report-. Korean J Pain 2006. [DOI: 10.3344/kjp.2006.19.1.115] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Sang Hyun Kim
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
| | - Kyoo Nam Kim
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
| | - Dong Gi Lee
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Gumi Hospital, Gumi, Korea
| | - Won Seok Chae
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
| | - Yong Ik Kim
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
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Kim SH, Kim KN, Chae WS, Lee DG, Jin HC, Lee JS, Kim YI. Uncommon Clinical Presentation of Inadvertent Subdural Local Anesthetic Injection While Attempting Thoracic Epidural Anesthesia: A case report. Korean J Anesthesiol 2006. [DOI: 10.4097/kjae.2006.51.1.112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Sang Hyun Kim
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
| | - Kyoo Nam Kim
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
| | - Won Seok Chae
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
| | - Dong Gi Lee
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Gumi Hospital, Gumi, Korea
| | - Hee Chul Jin
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
| | - Jeong Seok Lee
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
| | - Yong Ik Kim
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
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Choi SM, Lee DG, Kim MS, Park YH, Kim YJ, Lee S, Kim HJ, Choi JH, Yoo JH, Kim DW, Min WS, Shin WS, Kim CC. Bacteremic cellulitis caused by non-O1, non-O139 Vibrio cholerae in a patient following hematopoietic stem cell transplantation. Bone Marrow Transplant 2003; 31:1181-2. [PMID: 12796802 DOI: 10.1038/sj.bmt.1704044] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Lee DG, Park JJ, Sung JH, Nam CH. Wave-front phase measurements of high-order harmonic beams by use of point-diffraction interferometry. Opt Lett 2003; 28:480-482. [PMID: 12659286 DOI: 10.1364/ol.28.000480] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We report the wave-front phase measurement of high-order harmonics employing point-diffraction interferometry. The high-order harmonics generated in a gas-filled hollow tube showed excellent spatial coherence over nearly the whole cross section of the harmonic beams. Using this coherent harmonic source in the extreme-ultraviolet-soft-x-ray region, we have demonstrated the operation of a point-diffraction interferometer and measured the wave-front phase of high-order harmonics.
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Affiliation(s)
- D G Lee
- Department of Physics, Coherent X-Ray Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
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Chae HJ, Jeong BJ, Ha MS, Lee JK, Byun JO, Jung WY, Yun YG, Lee DG, Oh SH, Chae SW, Kwak YG, Kim HH, Lee ZH, Kim HR. ERK MAP Kinase is required in 1,25(OH)2D3-induced differentiation in human osteoblasts. Immunopharmacol Immunotoxicol 2002; 24:31-41. [PMID: 12022443 DOI: 10.1081/iph-120003401] [Citation(s) in RCA: 22] [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] [Indexed: 11/03/2022]
Abstract
Expression of alkaline phosphatase(ALP)activity represents a key event during the differentiation processes of osteoblasts, and the level of ALP activity has been routinely used as a relative measure of differentiation stages of osteoblasts. In human osteoblasts, we showed that vitamin D3 analogue, 1,25(OH)2D3, had a stimulatory effect on ALP activity after 3 days, compared with control. The treatment of PD098059, an ERK MAP Kinase inhibitor, had a reducing effect on ALP activity, a differentiation marker in 1,25(OH)2D3-treated primary human osteoblasts. However, SB203580, a potent p38 MAP Kinase inhibitor, had no effect on the differentiation in this system. This indicates that ERK, not p38, is directly related to 1,25(OH)2D3-stimulated ALP activity in primary human osteoblasts. These results also show that the vitamin D3 analogue stimulates ERK1 activation in primary human osteoblasts. This finding provides one of signaling pathways for differentiation in primary human osteoblasts.
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Affiliation(s)
- H J Chae
- Department of Dental Pharmacology and Wonkwang Dental Research Institute, School of Dentistry, Wonkwang University, Iksan, Chonbuk, South Korea
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Abstract
High-order harmonics were coherently controlled using chirped femtosecond laser pulses for the production of sharp and strong harmonics. As the laser intensity was increased above the saturation intensity for optical-field ionization, the laser chirp needed to suppress harmonic chirp in the plateau region changed from positive to negative. We showed that the modification of a laser chirp condition in a rapidly ionizing medium should be included for the proper coherent control of high-order harmonics, necessitating the integral treatment of the interaction between atoms and a driving laser pulse.
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Affiliation(s)
- D G Lee
- Department of Physics and Coherent X-ray Research Center, Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea
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Jang KY, Kang MJ, Lee DG, Chung MJ. Utility of thyroid transcription factor-1 and cytokeratin 7 and 20 immunostaining in the identification of origin in malignant effusions. Anal Quant Cytol Histol 2001; 23:400-4. [PMID: 11777274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To estimate the utility of thyroid transcription factor-1 (TTF-1) and the combined cytokeratin 7 (CK7) and 20 (CK20) immunoprofile as a marker for identifying the primary site of metastatic adenocarcinoma in effusions of the serous cavity. STUDY DESIGN Formalin-fixed, paraffin-embedded cell block specimens of pleural and peritonealfluid diagnosed as metastatic adenocarcinomas with known sites of origin were used for TTF-1, CK7 and CK20 immunohistochemistry. The primary sites of these cases were lung (16 cases), ovary (15), stomach (9), colon (8) and breast (8) and were confirmed by radiologic and/or histologic evaluation. RESULTS The lung adenocarcinomas showed TTF-1 positivity in 81% (13/16) of cases. All nonpulmonary adenocarcinomas lacked TTF-1 staining. The CK7-/CK20+ immunophenotype was seen in 63% of colonic adenocarcinomas and not seen in lung, ovary, stomach or breast adenocarcinomas. The CK7+/CK20- immunophenotype was seen in 100%, 88% and 87% of cases that originated in the lung, breast and ovary, respectively. CONCLUSION TTF-7 immunostaining is useful in the differentiation between pulmonary and nonpulmonary origin of adenocarcinomas in malignant effusions. The combination of CK7-/CK20+ immunostaining is useful in identifying colon adenocarcinomas.
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Affiliation(s)
- K Y Jang
- Department of Pathology, Chonbuk National University Medical School, Chonju, Republic of Korea
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Shin SY, Lee SH, Yang ST, Park EJ, Lee DG, Lee MK, Eom SH, Song WK, Kim Y, Hahm KS, Kim JI. Antibacterial, antitumor and hemolytic activities of alpha-helical antibiotic peptide, P18 and its analogs. J Pept Res 2001; 58:504-14. [PMID: 12005420 DOI: 10.1034/j.1399-3011.2001.00934.x] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The alpha-helical antibiotic peptide (P18: KWKLFKKIPKFLHLAKKF-NH2) designed from the cecropin A(1-8)-magainin 2 (1-12) hybrid displayed strong bactericidal and tumoricidal activity without inducing hemolysis. The effect of the Pro9 residue at central position of P18 on cell selectivity was investigated by Pro9 --> Leu or Pro9 --> Ser substitution. Either substitution markedly reduced the antibacterial activity of P18 and increased hemolysis, although it did not significantly affect cytotoxicity against human transformed tumor and normal fibroblast cells. These results suggest that a proline kink in alpha-helical antibiotic peptide P18 serves as a hinge region to facilitate ion channel formation on bacterial cell membranes and thus plays an important role in providing high selectivity against bacterial cells. Furthermore, to investigate the structure-antibiotic activity relationships of P18, a series of N- or C-terminal deletion and substitution analogs of P18 were synthesized. The C-terminal region of P18 was related to its antibiotic activity and alpha-helical conformation on lipid membranes rather than N-terminal one. Higher alpha-helicity of the peptides was involved in the hemolytic and antitumor activity rather than antibacterial activity. Except for [L9]-P18 and [S9]-P18, all the designed peptides containing a Pro residue showed potent antibacterial activity, although they did not induce a cytolytic effect against human erythrocyte and normal fibroblast cells at the concentration required to kill bacteria. In particular, P18 and some analogs (N-1, N-2, N-3, N-3L and N-4L) with potent bactericidal and tumoricidal activity and little or no normal cell toxicity may serve as an attractive candidate for the development of novel anti-infective or antitumor agents.
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Affiliation(s)
- S Y Shin
- Department of Life Science, Kwangju Institute of Science and Technology, Korea
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39
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Min CK, Lee WY, Min DJ, Lee DG, Kim YJ, Park YH, Kim HJ, Lee S, Kim DW, Lee JW, Min WS, Kim CC. The kinetics of circulating cytokines including IL-6, TNF-alpha, IL-8 and IL-10 following allogeneic hematopoietic stem cell transplantation. Bone Marrow Transplant 2001; 28:935-40. [PMID: 11753547 DOI: 10.1038/sj.bmt.1703258] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2001] [Accepted: 09/10/2001] [Indexed: 12/31/2022]
Abstract
Pro-inflammatory (IL-6, TNFalpha and IL-8) and anti-inflammatory (IL-10) cytokines were determined in weekly samples from 52 patients undergoing allogeneic hematopoietic stem cell transplantation (HSCT). IL-6 increased immediately after transplant peaking at week +3, but IL-8 concentrations were elevated only during week +1. After a slight decrease in week +1, TNF-alpha significantly increased from week +2 and peaked at week +3, whereas, IL-10 values started to rise in week +2 and peaked during week +4. IL-6 and TNF-alpha were positively correlated from week +2 to week +4, and IL-6 levels at week +1 were related with fever and severe stomatitis. Serum levels of IL-6 at week +1 and IL-10 at week +4 were significantly higher in patients with early transplant-related complications, such as fever, severe stomatitis or acute GVHD > or = overall grade II than in those without the complications. We conclude that a high serum IL-6 level at week +1 may be an early predictor of transplant-related complications and that it seems to trigger pro- and anti-inflammatory cytokine release. Kinetic patterns of IL-6 and IL-10 were more exaggerated in those with complications after HSCT.
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Affiliation(s)
- C K Min
- The Catholic Hemopoietic Stem Cell Transplantation Center, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Abstract
Sarcomatoid carcinoma is a rare biphasic tumor characterized by a combination of malignant epithelial and mesenchymal cells. We report a rare case of sarcomatoid carcinoma of the colon. A 41-yr-old woman was hospitalized with a history of melena. Total colectomy was performed under the impression of colonic carcinoma. Histologically, the tumor was composed of differentiated adenocarcinoma in superficial portion and sarcomatoid spindle cells in deeper portion with a transitional area between the two portions. The sarcomatous areas revealed polygonal and spindle-shaped anaplastic malignant cells arranged in sheet, short fascicular or haphazard pattern. Immunohistochemically, tumor cells showed a positive immunoreaction for cytokeratin, epithelial membrane antigen, and vimentin. The histopathological and immunohistochemical transitions between the adenocarcinoma area and the spindle cell area suggested that the sarcomatous elements originated from the adenocarcinoma during tumor progression.
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Affiliation(s)
- J H Kim
- Department of Pathology, Eulji University, School of Medicine, Taejeon, Korea.
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41
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Park BJ, Lee DG, Yu JR, Jung SK, Choi K, Lee J, Lee J, Kim YS, Lee JI, Kwon JY, Lee J, Singson A, Song WK, Eom SH, Park CS, Kim DH, Bandyopadhyay J, Ahnn J. Calreticulin, a calcium-binding molecular chaperone, is required for stress response and fertility in Caenorhabditis elegans. Mol Biol Cell 2001; 12:2835-45. [PMID: 11553721 PMCID: PMC59717 DOI: 10.1091/mbc.12.9.2835] [Citation(s) in RCA: 108] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2001] [Revised: 06/19/2001] [Accepted: 07/08/2001] [Indexed: 11/11/2022] Open
Abstract
Calreticulin (CRT), a Ca(2+)-binding protein known to have many cellular functions, including regulation of Ca(2+) homoeostasis and chaperone activity, is essential for heart and brain development during embryogenesis in mice. Here, we report the functional characterization of Caenorhabditis elegans calreticulin (crt-1). A crt-1 null mutant does not result in embryonic lethality but shows temperature-dependent reproduction defects. In C. elegans CRT-1 is expressed in the intestine, pharynx, body-wall muscles, head neurons, coelomocytes, and in sperm. crt-1 males exhibit reduced mating efficiency and defects late in sperm development in addition to defects in oocyte development and/or somatic gonad function in hermaphrodites. Furthermore, crt-1 and itr-1 (inositol triphosphate receptor) together are required for normal behavioral rhythms. crt-1 transcript level is elevated under stress conditions, suggesting that CRT-1 may be important for stress-induced chaperoning function in C. elegans.
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Affiliation(s)
- B J Park
- Department of Life Science, Kwangju Institute of Science and Technology, Kwangju, 500-712, Korea
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42
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Kim DH, Lee DG, Kim KL, Lee Y. Internalization of tenecin 3 by a fungal cellular process is essential for its fungicidal effect on Candida albicans. Eur J Biochem 2001; 268:4449-58. [PMID: 11502205 DOI: 10.1046/j.1432-1327.2001.02364.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Tenecin 3 is a glycine-rich, antifungal protein of 78 residues isolated from the insect Tenebrio molitor larva. As an initial step towards understanding the antifungal mechanism of tenecin 3, we examined how this protein interacts with the pathogenic fungus Candida albicans to exert its antifungal action. Tenecin 3 did not induce the release of a fluorescent dye trapped in the artificial membrane vesicles and it did not perturb the membrane potential of C. albicans by the initial interaction. Fluorescence confocal microscopy and flow cytometric analysis revealed that tenecin 3 is rapidly internalized into the cytoplasmic space in energy-dependent and temperature-dependent manners. This internalization is also dependent on the ionic environment and cellular metabolic states. These results suggest that the internalization of tenecin 3 into the cytoplasm of C. albicans is mediated by a fungal cellular process. The internalized tenecin 3 is dispersed in the cytoplasm, and the loss of cell viability occurs after this internalization.
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Affiliation(s)
- D H Kim
- Department of Chemistry and Center for Molecular Design and Synthesis, Korea Advanced Institute of Science and Technology, Taejon, Korea
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Huynh MH, Lee DG, White PS, Meyer TJ. Redox-induced terpyridyl substitution in the Os(VI)-hydrazido complex, trans-[Os(VI)(tpy)(Cl)(2)(NN(CH(2))(4)O)](2+). Inorg Chem 2001; 40:3842-9. [PMID: 11466041 DOI: 10.1021/ic001154i] [Citation(s) in RCA: 11] [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: 11/29/2022]
Abstract
Reaction between the Os(VI)-hydrazido complex, trans-[Os(VI)(tpy)(Cl)(2)(NN(CH(2))(4)O)](2+) (tpy = 2,2':6',2"-terpyridine and O(CH(2))(4)N(-) = morpholide), and a series of N- or O-bases gives as products the substituted Os(VI)-hydrazido complexes, trans-[Os(VI)(4'-RNtpy)(Cl)(2)(NN(CH(2))(4)O)](2+) or trans-[Os(VI)(4'-ROtpy)(Cl)(2)(NN(CH(2))(4)O)](2+) (RN(-) = anilide (PhNH(-)); S,S-diphenyl sulfilimide (Ph(2)S=N(-)); benzophenone imide (Ph(2)C=N(-)); piperidide ((CH(2))(5)N(-)); morpholide (O(CH(2))(4)N(-)); ethylamide (EtNH(-)); diethylamide (Et(2)N(-)); and tert-butylamide (t-BuNH(-)) and RO(-) = tert-butoxide (t-BuO(-)) and acetate (MeCO(2)(-)). The rate law for the formation of the morpholide-substituted complex is first order in trans-[Os(VI)(tpy)(Cl)(2)(NN(CH(2))(4)O)](2+) and second order in morpholine with k(morp)(25 degrees C, CH(3)CN) = (2.15 +/- 0.04) x 10(6) M(-)(2) s(-)(1). Possible mechanisms are proposed for substitution at the 4'-position of the tpy ligand by the added nucleophiles. The key features of the suggested mechanisms are the extraordinary electron withdrawing effect of Os(VI) on tpy and the ability of the metal to undergo intramolecular Os(VI) to Os(IV) electron transfer. These substituted Os(VI)-hydrazido complexes can be electrochemically reduced to the corresponding Os(V), Os(IV), and Os(III) forms. The Os-N bond length of 1.778(4) A and Os-N-N angle of 172.5(4) degrees in trans-[Os(VI)(4'-O(CH(2))(4)Ntpy)(Cl)(2)(NN(CH(2))(4)O)](2+) are consistent with sp-hybridization of the alpha-nitrogen of the hydrazido ligand and an Os-N triple bond. The extensive ring substitution chemistry implied for the Os(VI)-hydrazido complexes is discussed.
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Affiliation(s)
- M H Huynh
- Department of Chemistry, Venable and Kenan Laboratories, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA.
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Hwang O, Kim G, Jang YJ, Kim SW, Choi G, Choi HJ, Jeon SY, Lee DG, Lee JD. Synthetic phytoceramides induce apoptosis with higher potency than ceramides. Mol Pharmacol 2001; 59:1249-55. [PMID: 11306710 DOI: 10.1124/mol.59.5.1249] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [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: 11/22/2022] Open
Abstract
Ceramides are naturally occurring compounds recognized to mediate apoptosis. N-acylsphingosines, containing a double bond at carbons 4 and 5 of their sphingoid backbone, are thought to be the active form, because N-acylsphinganines with completely saturated sphingoid are inactive. In the present study, we synthesized a series of N-acyl-4D-ribo-phytosphingosines (phytoceramides) that contain a hydroxyl group at carbon 4 and investigated structure-cytotoxicity relationship of the presumed functional groups in ceramides. N-Acetylphytoceramide (PCer2) and N-hexanoylphytoceramide (PCer6) were found to be more cytotoxic than ceramides as determined by released lactate dehydrogenase activity and morphological criteria. This was not caused by intracellular conversion of phytoceramides to ceramides, because no N-hexanoylsphingosine was formed after incubation of cell lysate with PCer6. Among phytoceramides having acyl chains two to eight carbons long, the cytotoxicity was highest with five or six carbons. The carbonyl group of the amide bond did not seem to be critical, because substitution of the oxygen with sulfur did not influence the cytotoxicity. The phytoceramide-induced cell death was observed to be apoptotic in nature with the use of terminal deoxynucleotidyl transferase dUTP nick-end labeling and propidium iodide staining. Because phytoceramides can be readily synthesized from yeast sources, they may present a potential and economical alternative to ceramide in future studies and therapies.
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Affiliation(s)
- O Hwang
- Department of Biochemistry, University of Ulsan College of Medicine, Seoul, Korea
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45
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Lee DG, Kim DH, Park Y, Kim HK, Kim HN, Shin YK, Choi CH, Hahm KS. Fungicidal effect of antimicrobial peptide, PMAP-23, isolated from porcine myeloid against Candida albicans. Biochem Biophys Res Commun 2001; 282:570-4. [PMID: 11401498 DOI: 10.1006/bbrc.2001.4602] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [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: 11/22/2022]
Abstract
The antifungal activity and mechanism of a 23-mer peptide, PMAP-23, derived from pig myeloid was investigated. PMAP-23 displayed strong antifungal activity against yeast and mold. To investigate the antifungal mechanism of PMAP-23, fluorescence activated flow cytometry and confocal laser scanning microscopy were performed. Candida albicans treated with PMAP-23 showed higher fluorescence intensity by propidium iodide(PI) staining, which was similar to that of Melittin than untreated cells. Confocal microscopy showed that the peptide was located in the plasma membrane. The action of peptides against fungal cell membranes was examined by treating prepared protoplasts of C. albicans with the peptide and lipid vesicle titration test. The result showed that the peptide prevented the regeneration of fungal cell walls and induced release of the fluorescent dye trapped in the artificial membrane vesicles, indicating that the peptide exerts its antifungal activity by acting on the plasma lipid membrane.
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Affiliation(s)
- D G Lee
- Research Center for Proteineous Materials, Department of Pharmacology, School of Medicine, Chosun University, 375 Seosuk-Dong, Kwangju, Dong-Ku, 501-759, Korea
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46
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Lee DG, Choi JH, Kim YJ, Lee S, Min CK, Kim DW, Lee JW, Min WS, Shin WS, Kim CC. Hepatosplenic tuberculosis mimicking disseminated candidiasis in patients with acute leukemia. Int J Hematol 2001; 73:119-21. [PMID: 11372747 DOI: 10.1007/bf02981913] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Two cases of hepatosplenic tuberculosis in patients with acute leukemia during or after chemotherapy following prolonged neutropenia are presented. Tuberculosis should be considered as one cause of hepatosplenic abscesses during prolonged neutropenia, especially in countries where the disease is endemic.
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MESH Headings
- Acute Disease
- Adult
- Antineoplastic Agents/adverse effects
- Antineoplastic Agents/therapeutic use
- Candidiasis/diagnosis
- Candidiasis/microbiology
- Diagnosis, Differential
- Female
- Humans
- Leukemia/complications
- Leukemia/microbiology
- Leukemia/therapy
- Leukemia, Myeloid, Acute/complications
- Leukemia, Myeloid, Acute/microbiology
- Leukemia, Myeloid, Acute/therapy
- Liver/microbiology
- Liver/pathology
- Neutropenia/complications
- Neutropenia/etiology
- Neutropenia/microbiology
- Spleen/microbiology
- Spleen/pathology
- Tuberculosis, Hepatic/chemically induced
- Tuberculosis, Hepatic/diagnosis
- Tuberculosis, Hepatic/microbiology
- Tuberculosis, Splenic/diagnosis
- Tuberculosis, Splenic/microbiology
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Affiliation(s)
- D G Lee
- Catholic Hemopoietic Stem Cell Transplantation Center, College of Medicine, The Catholic University of Korea, Seoul
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Abstract
Histochemical, immunohistochemical and ultrastructural studies were performed on cases of hepatocellular carcinoma (HCC) with pale bodies (PB). HCC containing PBs was observed in 3 (5.5%) of 55 consecutively resected HCC cases. Histologically, a large number of hepatocytes displayed pale or eosinophilic staining of the cytoplasm, resulting in ground-glass appearance. They were aggregated in nodular pattern, or diffusely intermixed with other malignant hepatocytes. PBs were negative for periodic-acid Schiff and Masson's trichrome staining. The inclusions showed a strong positive reaction for fibrinogen and some of them were weakly positive for albumin but negative for hepatitis B surface antigen, hepatitis B core antigen, alpha-fetoprotein and alpha-1-antitrypsin. Ultrastructurally, PBs were membrane-bound and contained granular materials of moderate electron density, and were closely related to dilated rough endoplasmic reticulum. These findings support that PBs are secretory fibrinogen accumulated in cystic ER and that such intracellular accumulation possibly reflects a defective transport of fibrinogen.
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Affiliation(s)
- W S Moon
- Department of Pathology, Chonbuk National University, Medical School, Institute for Medical Science, Chonju, Korea.
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Choi JH, Chung WJ, Han SJ, Lee HB, Choi IW, Lee HK, Jang KY, Lee DG, Han SS, Park KH, IM SY. Selective involvement of reactive oxygen intermediates in platelet-activating factor-mediated activation of NF-kappaB. Inflammation 2000; 24:385-98. [PMID: 10921504 DOI: 10.1023/a:1007068010645] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Although it has been suggested that some biological activities of platelet-activating factor (PAF) are mediated by, at least in part, reactive oxygen intermediates (ROI), the precise mechanisms underlying the interaction between the two remains to be elucidated. Antioxidants, such as alpha-tocopherol acid succinate, N-acetyl-L-Cysteine, pyrrolidinedithiocarbamate failed to inhibit PAF-induced immediate systemic reactions such as lethality, symptoms of disseminated intravascular coagulation, and histological changes such as pulmonary edema and hemorrhage in renal medullae 10 min following PAF injection. In contrast. antioxidants significantly inhibited both the in vivo and in vitro PAF-induced NF-kappaB activation and NF-kappaB-dependent TNF-alpha expression. The effects of the antioxidants were due to their inhibition of PAF-induced degradation of IkappaBalpha, a protein responsible for keeping NF-kappaB in an inactive form. A protein tyrosine kinase and N-tosyl-L-phenylalanine chloromethyl ketone sensitive serine protease were involved in both PAF- and H2O2-induced NF-kappaB activation. Collectively, these data indicate that the PAF-induced NF-kappaB activation is selectively mediated through the generation of ROI.
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Affiliation(s)
- J H Choi
- Department of Biological Science, College of Natural Sciences, Chonnam National University, Kwangju, Republic of Korea
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Choi JH, Lee JM, Shin WS, Choi SM, Lee DG, Yoo JH, Kim DW, Lee JW, Min WS, Kim CC. Necrotizing enterocolitis: experience of 27 cases from a single Korean institution. Int J Hematol 2000; 72:358-61. [PMID: 11185995] [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: 02/19/2023]
Abstract
Necrotizing enterocolitis (NEC) can involve any site in the gastrointestinal tract and is a fatal complication of immunosuppression. To characterize NEC, clinical and radiological characteristics were analyzed. A total of 27 cases of NEC were identified from January 1993 to August 1998, and medical records were reviewed. NEC was diagnosed by clinical and radiological criteria, and other mimicking conditions were excluded. Of the NEC cases, 22 (81.5%) occurred in patients with underlying hematologic malignancy. All patients complained of abdominal pain and fever at the time of inclusion. Escherichia coli was the most common pathogen identified. The most common finding by computed tomography was single-layered diffuse bowel wall thickening with variable density. Other findings were ascites, fascial thickening, pneumatosis, and mesenteric lymphadenopathy. Of the patients, 25 were treated with antimicrobials with or without recombinant hematopoietic growth factors, and 2 were treated with surgery because of perforation and profound bleeding. Among the 12 patients who died, NEC was the direct cause of death in 7 patients. In conclusion, computed tomography is an effective tool for early diagnosis of NEC. Bowel rest, broad-spectrum antimicrobials, and recombinant hematopoietic growth factors are important aspects of treatment. Surgery should be reserved for complicated cases.
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Affiliation(s)
- J H Choi
- Department of Internal Medicine, St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea
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