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Sung Y, Hong ST, Jang M, Kim ES, Kim C, Jung Y, Youn I, Chan Kwon I, Cho SW, Ryu JH. Predicting response to anti-EGFR antibody, cetuximab, therapy by monitoring receptor internalization and degradation. Biomaterials 2023; 303:122382. [PMID: 37977005 DOI: 10.1016/j.biomaterials.2023.122382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 10/13/2023] [Accepted: 10/29/2023] [Indexed: 11/19/2023]
Abstract
Anti-epidermal growth factor receptor (EGFR) antibody, cetuximab, therapy has significantly improved the clinical outcomes of patients with colorectal cancer, but the response to cetuximab can vary widely among individuals. We thus need strategies for predicting the response to this therapy. However, the current methods are unsatisfactory in their predictive power. Cetuximab can promote the internalization and degradation of EGFR, and its therapeutic efficacy is significantly correlated with the degree of EGFR degradation. Here, we present a new approach to predict the response to anti-EGFR therapy, cetuximab by evaluating the degree of EGFR internalization and degradation of colorectal cancer cells in vitro and in vivo. Our newly developed fluorogenic cetuximab-conjugated probe (Cetux-probe) was confirmed to undergo EGFR binding, internalization, and lysosomal degradation to yield fluorescence activation; it thus shares the action mechanism by which cetuximab exerts its anti-tumor effects. Cetux-probe-activated fluorescence could be used to gauge EGFR degradation and showed a strong linear correlation with the cytotoxicity of cetuximab in colorectal cancer cells and tumor-bearing mice. The predictive ability of Cetux-probe-activated fluorescence was much higher than those of EGFR expression or KRAS mutation status. The Cetux-probes may become useful tools for predicting the response to cetuximab therapy by assessing EGFR degradation.
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Affiliation(s)
- Yejin Sung
- Biomedical Research Division, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea; Graduate Program in Bioindustrial Engineering, College of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea
| | - Seung Taek Hong
- Biomedical Research Division, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea; Division of Biohealthcare, Department of Echo-Applied Chemistry, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do, 11159, Republic of Korea
| | - Mihue Jang
- Biomedical Research Division, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Eun Sun Kim
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Korea University College of Medicine, Seoul, 20841, Republic of Korea
| | - Chansoo Kim
- AI/R Lab., Computational Science Centre & ASSIST, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Youngmee Jung
- Biomedical Research Division, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Inchan Youn
- Biomedical Research Division, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Ick Chan Kwon
- Biomedical Research Division, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea; KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea
| | - Seung-Woo Cho
- Graduate Program in Bioindustrial Engineering, College of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea; Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, 03722, Republic of Korea; Center for Nanomedicine, Institute for Basic Science (IBS), Seoul, 03722, Republic of Korea.
| | - Ju Hee Ryu
- Biomedical Research Division, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea.
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2
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Hong ST, Kim MS, Kim BR, Lee EJ, Yoon YU, Paik KC, Han MS, Kim ES, Cho BR. Organelle-specific blue-emitting two-photon probes for calcium ions: Combination with green-emitting two-photon probe for simultaneous detection of proton ions. Talanta 2022; 244:123408. [DOI: 10.1016/j.talanta.2022.123408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 03/22/2022] [Accepted: 03/24/2022] [Indexed: 10/18/2022]
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Yoo JH, Kim JM, Hong KP, Lee J, Hong ST. Journal of Korean Medical Science (JKMS): influential flagship medical journal in the Republic of Korea. Hong Kong Med J 2021; 27:242-243. [PMID: 34413253 DOI: 10.12809/hkmj215119] [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: 11/05/2022] Open
Affiliation(s)
- J H Yoo
- Deputy Editor, Journal of Korean Medical Science, Korea.,Division of Infectious Diseases, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.,Division of Infectious Diseases, Department of Internal Medicine, Bucheon St Mary's Hospital, Bucheon, Korea
| | - J M Kim
- Deputy Editor, Journal of Korean Medical Science, Korea.,Department of Neurology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - K P Hong
- Deputy Editor, Journal of Korean Medical Science, Korea.,Department of Medicine, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - J Lee
- Director of International Affairs, the Korean Academy of Medical Sciences, Korea.,Department of Radiology, Kyungpook National University Hospital, Daegu, Korea
| | - S T Hong
- Editor-in-Chief, Journal of Korean Medical Science, Korea.,Department of Tropical Medicine and Parasitology, Seoul National University College of Medicine, Seoul, Korea
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4
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Choi JW, Choi SH, Hong ST, Kim MS, Ryu SS, Yoon YU, Paik KC, Han MS, Sim T, Cho BR. Two-photon probes for the endoplasmic reticulum: its detection in a live tissue by two-photon microscopy. Chem Commun (Camb) 2020; 56:3657-3660. [DOI: 10.1039/d0cc00236d] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BER-blue and FER-green can detect the endoplasmic reticulum in a live tissue by two-photon microscopy.
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Hong ST, Koh B, Choi SJ, Yoon E, Pyo MC, Choi JW, Kim MS, Lee EJ, Paik KC, Han MS, Chun HJ, Heo JN, Kim ES, Cho BR. Two-Photon Probe for TNF-α. Assessment of the Transmembrane TNF-α Level in Human Colon Tissue by Two-Photon Microscopy. Anal Chem 2019; 91:15769-15776. [PMID: 31663332 DOI: 10.1021/acs.analchem.9b04036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We developed Pyr1-infliximab: a two-photon probe for TNF-α. Pyr1-infliximab showed absorption maxima at 280 and 438 nm and an emission maximum at 610 nm in an aqueous buffer and effective two-photon action cross-section values of (520-2830) × 10-50 cm4s/photon in RAW 264.7 cells. After this probe was labeled, it was possible to detect Pyr1-infliximab-transmembrane TNF-α complexes in a live cell and to determine the relative proportion of these complexes in human colon tissues. This proportion among healthy, possibly inflamed, and inflamed tissues of patients with ulcerative colitis was found to be 1.0/4.5/10. This probe may find useful applications for selective detection of transmembrane TNF-α in a live cell or tissue, for quantification of inflammation in human colon tissue or of antidrug antibodies in patients who stop responding to anti-TNF therapy, and for monitoring of the response to this therapy.
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Affiliation(s)
- Seung Taek Hong
- KU-KIST Graduate School of Converging Science and Technology , Korea University , 145 Anam-ro, Seongbuk-gu , Seoul 02841 , Republic of Korea
| | - Byumseok Koh
- Therapeutics and Biotechnology Division , Korea Research Institute of Chemical Technology , 141 Gajeong-ro , Daejeon 34114 , Republic of Korea
| | - Seong Ji Choi
- Department of Internal Medicine , Korea University College of Medicine , 73 Inchon-ro, Seongbuk-gu , Seoul 02841 , Republic of Korea
| | - Eunyoung Yoon
- Therapeutics and Biotechnology Division , Korea Research Institute of Chemical Technology , 141 Gajeong-ro , Daejeon 34114 , Republic of Korea
| | - Min Cheol Pyo
- Department of Biotechnology , Korea University , 145 Anam-ro, Seongbuk-gu , Seoul 02841 , Republic of Korea
| | - Ji-Woo Choi
- KU-KIST Graduate School of Converging Science and Technology , Korea University , 145 Anam-ro, Seongbuk-gu , Seoul 02841 , Republic of Korea
| | - Mun Seok Kim
- Department of Chemistry , Daejin University , 1007 Hoguk-ro , Pocheon-si , Gyeonggi-do 11159 , Republic of Korea
| | - Eun Jeong Lee
- Department of Chemistry , Daejin University , 1007 Hoguk-ro , Pocheon-si , Gyeonggi-do 11159 , Republic of Korea
| | - Kyu Cheol Paik
- Department of Chemistry , Daejin University , 1007 Hoguk-ro , Pocheon-si , Gyeonggi-do 11159 , Republic of Korea
| | - Man So Han
- Department of Chemistry , Daejin University , 1007 Hoguk-ro , Pocheon-si , Gyeonggi-do 11159 , Republic of Korea
| | - Hoon Jai Chun
- Department of Internal Medicine , Korea University College of Medicine , 73 Inchon-ro, Seongbuk-gu , Seoul 02841 , Republic of Korea
| | - Jung-Nyoung Heo
- Therapeutics and Biotechnology Division , Korea Research Institute of Chemical Technology , 141 Gajeong-ro , Daejeon 34114 , Republic of Korea.,Graduate School of New Drug Discovery and Development , Chungnam National University , 99 Daehak-ro , Daejeon 34134 , Republic of Korea
| | - Eun Sun Kim
- Department of Internal Medicine , Korea University College of Medicine , 73 Inchon-ro, Seongbuk-gu , Seoul 02841 , Republic of Korea
| | - Bong Rae Cho
- KU-KIST Graduate School of Converging Science and Technology , Korea University , 145 Anam-ro, Seongbuk-gu , Seoul 02841 , Republic of Korea.,Department of Chemistry , Daejin University , 1007 Hoguk-ro , Pocheon-si , Gyeonggi-do 11159 , Republic of Korea.,Department of Chemistry , Korea University , 145 Anam-ro, Seongbuk-gu , Seoul 02841 , Republic of Korea
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Choi JW, Hong ST, Kim MS, Paik KC, Han MS, Cho BR. Two-Photon Probes for Golgi Apparatus: Detection of Golgi Apparatus in Live Tissue by Two-Photon Microscopy. Anal Chem 2019; 91:6669-6674. [PMID: 30919620 DOI: 10.1021/acs.analchem.9b00607] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We have developed blue- and yellow-emitting two-photon probes (BGolgi-blue and PGolgi-yellow) from 6-(benzo[ d]oxazol-2-yl)-2-naphthalylamine and 2,5-bis(benzo[ d]oxazol-2-yl)pyrazine derivatives as the fluorophores and trans-Golgi-network peptide (SDYQRL) as the Golgi-apparatus-targeting moiety. HeLa cells labeled with BGolgi-blue and PGolgi-yellow emitted two-photon-excited fluorescence at 462 and 560 nm, respectively, with effective two-photon-action cross-section values of 1860 and 1600 × 10-50 cm4·s/photon, respectively. The probes can detect the Golgi apparatus in live cells and deep inside live tissue via two-photon microscopy at widely separated wavelength regions with high selectivity and minimal pH interference, and they are photostable and have low cytotoxicity.
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Affiliation(s)
- Ji-Woo Choi
- KU-KIST Graduate School of Converging Science and Technology , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea
| | - Seung Taek Hong
- KU-KIST Graduate School of Converging Science and Technology , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea
| | - Mun Seok Kim
- Department of Chemistry , Daejin University , 1007 Hoguk-ro , Pocheon-si , Gyeonggi-do 11159 , Republic of Korea
| | - Kyu Cheol Paik
- Department of Chemistry , Daejin University , 1007 Hoguk-ro , Pocheon-si , Gyeonggi-do 11159 , Republic of Korea
| | - Man So Han
- Department of Chemistry , Daejin University , 1007 Hoguk-ro , Pocheon-si , Gyeonggi-do 11159 , Republic of Korea
| | - Bong Rae Cho
- Department of Chemistry , Daejin University , 1007 Hoguk-ro , Pocheon-si , Gyeonggi-do 11159 , Republic of Korea.,Department of Chemistry , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea
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Kim W, Kim ES, Min G, Kim SH, Choi SJ, Lee JM, Lee JM, Choi HS, Keum B, Jeen YT, Lee HS, Chun HJ, Kim CD, Hong ST, Heo JN, Cho BR. Two-photon probes for pH: Detection of human colon cancer using two-photon microscopy. J Clin Oncol 2018. [DOI: 10.1200/jco.2018.36.4_suppl.607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
607 Background: In cancer cells, lysosomal pH decreases along with a concomitant increase in lysosomal volume and cathepsin expression levels. Lysosomes also play crucial roles in cancer progression following their release into the extracellular space. Since cancer cells invade a tissue by secreting degradative enzymes, the extracellular pH of tumor tissues becomes acidic. However, to date, there has been no report on the use of multi-photon microscopy (MPM) probes to image human colon cancer tissues. Methods: We have developed multi-photon (MP) pH-sensitive probes (BH-2 and BHEt-1) that exhibit absorption and emission maxima at 370 and 466 nm, and TP absorption cross-section values of 51 and 61 GM (1 GM = 10−50 cm4 s/photon), respectively, at 750 nm and pH 3.0 in a universal buffer (0.1 M citric acid, 0.1 M KH2PO4, 0.1 M Na2B4O7, 0.1 M Tris, 0.1 M KCl)/1,4-dioxane (7/ 3) solution. Results: The TPM images of CCD-18co (a normal colon cell line) and HCT116 cells (a colon cancer cell line) labeled with BH-2 were too dim to be distinguished. When the same cells were labeled with BHEt-1, however, the MPM image of the HCT116 cells was much brighter than that of CCD-18co cells, and the relative proportion of the acidic vesicles (Pacid) of the former was 5-fold larger than that of latter. BHEt-1 could also differentiate HepG2 cells (a human liver cancer cell line) from LX-2 cells (a human hepatic stellate cell line) with a 6-fold larger P acid value. Human colon cancer tissues labeled with BHEt-1 showed similar results, demonstrating much brighter MPM images and 6-fold larger Pacid values compared to normal tissue. Conclusions: These results suggest the potential utility of BHEt-1 for molecular image analysis of colon cancer tissues using MPM.
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Affiliation(s)
- Woojung Kim
- Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Eun Sun Kim
- Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Geeho Min
- Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Seung Han Kim
- Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Seong ji Choi
- Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Jung Min Lee
- Korea University Anam Hospital, Seoul, Korea, Republic of (South)
| | - Jae Min Lee
- Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Hyuk Soon Choi
- Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Bora Keum
- Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Yoon Tae Jeen
- Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Hong Sik Lee
- Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Hoon Jai Chun
- Korea University Anam Hospital, Seoul, Korea, Republic of (South)
| | - Chang Duck Kim
- Korea University College of Medicine, Seoul, Korea, Republic of (South)
| | - Seung Taek Hong
- KU-KIST Graduate School of Converging Science and Technology, Seoul, Korea, Republic of (South)
| | - Jung-Nyoung Heo
- Korea Research Institute of Chemical Technology, Graduate School of New Drug Discovery and Development, Daejeon, Korea, Republic of (South)
| | - Bong Rae Cho
- Daejin University, Gyeonggi-Do, Korea, Republic of (South)
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Hong ST, Kim TH, Choi JW, Park SJ, Kwon SA, Paik KC, Han MS, Kim ES, Chun HJ, Heo JN, Cho BR. Two-Photon Probes for pH: Detection of Human Colon Cancer using Two-Photon Microscopy. Anal Chem 2017; 89:9830-9835. [DOI: 10.1021/acs.analchem.7b01804] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Seung Taek Hong
- KU-KIST
Graduate School of Converging Science and Technology, Korea University, 145
Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Tae Hyeong Kim
- Medicinal
Chemistry Research Center, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Daejeon 34114, Republic of Korea
- Graduate
School of New Drug Discovery and Development, Chungnam National University, 99 Daehak-ro, Daejeon 34134, Republic of Korea
| | - Ji-Woo Choi
- KU-KIST
Graduate School of Converging Science and Technology, Korea University, 145
Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Seong Jun Park
- Medicinal
Chemistry Research Center, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Daejeon 34114, Republic of Korea
| | - Sung An Kwon
- Department
of Chemistry, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
| | - Kyu Cheol Paik
- Department
of Chemistry, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
| | - Man So Han
- Department
of Chemistry, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
| | - Eun Sun Kim
- Department
of Internal Medicine, Korea University College of Medicine, 73 Inchon-ro, Sungbuk-gu, Seoul 02841, Republic of Korea
| | - Hoon Jai Chun
- Department
of Internal Medicine, Korea University College of Medicine, 73 Inchon-ro, Sungbuk-gu, Seoul 02841, Republic of Korea
| | - Jung-Nyoung Heo
- Medicinal
Chemistry Research Center, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Daejeon 34114, Republic of Korea
- Graduate
School of New Drug Discovery and Development, Chungnam National University, 99 Daehak-ro, Daejeon 34134, Republic of Korea
| | - Bong Rae Cho
- Department
of Chemistry, Daejin University, 1007 Hoguk-ro, Pocheon-si, Gyeonggi-do 11159, Republic of Korea
- Department
of Chemistry, Korea University, 145 Anam-ro, Sungbuk-gu, Seoul 02841, Republic of Korea
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9
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Choi JW, Hong ST, Kang DE, Paik KC, Han MS, Lim CS, Cho BR. Two-Photon Tracer for Human Epidermal Growth Factor Receptor-2: Detection of Breast Cancer in a Live Tissue. Anal Chem 2016; 88:9412-9418. [DOI: 10.1021/acs.analchem.6b00912] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Ji-Woo Choi
- KU-KIST
Graduate School of Converging Science and Technology, Korea University, 145
Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Seung Taek Hong
- KU-KIST
Graduate School of Converging Science and Technology, Korea University, 145
Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Dong Eun Kang
- Department
of Chemistry, Korea University, 145 Anam-ro, Sungbuk-gu, Seoul, 02841, Republic of Korea
| | - Kyu Cheol Paik
- Department
of Chemistry, Daejin University, 1007 Hoguk-ro, Pochun-si, Gyeonggi-do 11159, Republic of Korea
| | - Man So Han
- Department
of Chemistry, Daejin University, 1007 Hoguk-ro, Pochun-si, Gyeonggi-do 11159, Republic of Korea
| | - Chang Su Lim
- Department
of Chemistry, Ajou University, 206 Worldcup-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16499, Republic of Korea
| | - Bong Rae Cho
- KU-KIST
Graduate School of Converging Science and Technology, Korea University, 145
Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
- Department
of Chemistry, Korea University, 145 Anam-ro, Sungbuk-gu, Seoul, 02841, Republic of Korea
- Department
of Chemistry, Daejin University, 1007 Hoguk-ro, Pochun-si, Gyeonggi-do 11159, Republic of Korea
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Su Lim C, Sun Kim E, Yeon Kim J, Taek Hong S, Jai Chun H, Eun Kang D, Rae Cho B. Measurement of the Nucleus Area and Nucleus/Cytoplasm and Mitochondria/Nucleus Ratios in Human Colon Tissues by Dual-Colour Two-Photon Microscopy Imaging. Sci Rep 2015; 5:18521. [PMID: 26673743 PMCID: PMC4682082 DOI: 10.1038/srep18521] [Citation(s) in RCA: 24] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 11/19/2015] [Indexed: 12/31/2022] Open
Abstract
We developed two-photon (TP) probes for DNA (ABI-Nu), cytoplasm (Pyr-CT), and mitochondria (BF-MT). We found that ABI-Nu binds to AT in the minor groove, while ABI-Nu and BF-MT are effective for tracking in the cytoplasm and mitochondria, respectively. These probes showed very large effective two-photon action cross section values of 2230, 1555, and 790 Göppert-Mayer units (1 GM = 10(-50) cm(4) s photon(-1) molecule(-1)) at 740 nm with emission maxima at 473, 561, and 560 nm, respectively, in each organelle. Using these probes, we quantitatively estimated the mean nuclear area and the ratios of nuclei to cytoplasm and mitochondria to nuclei in human colon tissues by dual-colour two-photon microscopy imaging within 2 h after biopsy. The mean nuclear area and the nuclei to cytoplasm and mitochondria to cytoplasm ratios increased in the following order: normal colon mucosa
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Affiliation(s)
- Chang Su Lim
- Department of Chemistry, Korea University, 145 Anam-ro, Sungbuk-gu, Seoul 136-713, Korea
| | - Eun Sun Kim
- Department of Internal Medicine, Korea University College of Medicine, 73 Inchon-ro, Seoul, 136-705, Korea
| | - Ji Yeon Kim
- Department of Chemistry, Korea University, 145 Anam-ro, Sungbuk-gu, Seoul 136-713, Korea
| | - Seung Taek Hong
- KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Sungbuk-gu, Seoul 136-713, Korea
| | - Hoon Jai Chun
- Department of Internal Medicine, Korea University College of Medicine, 73 Inchon-ro, Seoul, 136-705, Korea
| | - Dong Eun Kang
- Department of Chemistry, Korea University, 145 Anam-ro, Sungbuk-gu, Seoul 136-713, Korea
| | - Bong Rae Cho
- Department of Chemistry, Korea University, 145 Anam-ro, Sungbuk-gu, Seoul 136-713, Korea
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Lim CS, Hong ST, Ryu SS, Kang DE, Cho BR. Two-Photon Probes for Lysosomes and Mitochondria: Simultaneous Detection of Lysosomes and Mitochondria in Live Tissues by Dual-Color Two-Photon Microscopy Imaging. Chem Asian J 2015; 10:2240-9. [DOI: 10.1002/asia.201500314] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Indexed: 12/28/2022]
Affiliation(s)
- Chang Su Lim
- Department of Chemistry; Korea University; 1-Anamdong Seoul 136-701 Republic of Korea
| | - Seung Taek Hong
- KU-KIST Graduate School of Converging Science and Technology; Korea University; 1-Anamdong Seoul 136-701 Republic of Korea
| | - Seong Shick Ryu
- KU-KIST Graduate School of Converging Science and Technology; Korea University; 1-Anamdong Seoul 136-701 Republic of Korea
| | - Dong Eun Kang
- Department of Chemistry; Korea University; 1-Anamdong Seoul 136-701 Republic of Korea
| | - Bong Rae Cho
- Department of Chemistry; Korea University; 1-Anamdong Seoul 136-701 Republic of Korea
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Chung HJ, Hassan MM, Park JO, Kim HJ, Hong ST. Manipulation of a quasi-natural cell block for high-efficiency transplantation of adherent somatic cells. Braz J Med Biol Res 2015; 48:392-400. [PMID: 25742639 PMCID: PMC4445661 DOI: 10.1590/1414-431x20144322] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Accepted: 11/10/2014] [Indexed: 11/22/2022] Open
Abstract
Recent advances have raised hope that transplantation of adherent somatic cells could
provide dramatic new therapies for various diseases. However, current methods for
transplanting adherent somatic cells are not efficient enough for therapeutic
applications. Here, we report the development of a novel method to generate
quasi-natural cell blocks for high-efficiency transplantation of adherent somatic
cells. The blocks were created by providing a unique environment in which cultured
cells generated their own extracellular matrix. Initially, stromal cells isolated
from mice were expanded in vitro in liquid cell culture medium
followed by transferring the cells into a hydrogel shell. After incubation for 1 day
with mechanical agitation, the encapsulated cell mass was perforated with a thin
needle and then incubated for an additional 6 days to form a quasi-natural cell
block. Allograft transplantation of the cell block into C57BL/6 mice resulted in
perfect adaptation of the allograft and complete integration into the tissue of the
recipient. This method could be widely applied for repairing damaged cells or
tissues, stem cell transplantation, ex vivo gene therapy, or plastic
surgery.
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Affiliation(s)
- H J Chung
- Department of Biomedical Sciences, Institute for Medical Science, Chonbuk National University Medical School, Jeonju, Chonbuk, South Korea
| | - M M Hassan
- Department of Biomedical Sciences, Institute for Medical Science, Chonbuk National University Medical School, Jeonju, Chonbuk, South Korea
| | - J O Park
- Department of Biomedical Sciences, Institute for Medical Science, Chonbuk National University Medical School, Jeonju, Chonbuk, South Korea
| | - H J Kim
- JINIS BDRD Institute, JINIS Biopharmaceuticals Co., Wanju, Chonbuk, South Korea
| | - S T Hong
- Department of Biomedical Sciences, Institute for Medical Science, Chonbuk National University Medical School, Jeonju, Chonbuk, South Korea
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Kim SH, Kim ED, Chae WS, Hong ST, Jin HC, Kim YI. The Effect of Distraction Induced by ReliefBand®on the Pain Threshold and Temporal Summation Threshold. Korean J Anesthesiol 2006. [DOI: 10.4097/kjae.2006.51.3.350] [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: 11/10/2022] Open
Affiliation(s)
- Sang Hyun Kim
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
| | - Eung Don 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
| | - Seung Taek Hong
- 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
| | - Yong Ik Kim
- Department of Anesthesiology and Pain Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
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14
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Abstract
The effect of different 3-hydroxy-3-methyl-glutaryl coenzyme A reductase (HMGR)-inhibitors (statins) on plasma and egg cholesterol in laying hens was investigated. Forty-four ISA brown layers were fed lovastatin, simvastatin, or pravastatin at 0.03 or 0.06% for 4 wk. Cholesterol levels in plasma, liver, and egg yolk as well as hen laying performance were studied. Egg weight was significantly lowered with all statin treatments, although egg production was relatively unaffected. Total plasma cholesterol was significantly reduced by 0.06% lovastatin, 0.03% simvastatin, and 0.06% simvastatin, in agreement with previous reports, whereas pravastatin had no effect. In contrast, liver cholesterol concentrations showed a significant decrease in response to 0.03 and 0.06% pravastatin, implying selective regulation of liver cholesterol synthesis. Furthermore, oral administration with 0.06% pravastatin reduced egg cholesterol levels by almost 20% compared with the control diet. This suggests that pravastatin, unlike other classes of statin, may be a good candidate for commercial production of low cholesterol eggs with limited impact on hen physiology and egg production.
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Affiliation(s)
- J H Kim
- Jinis Biopharmaceuticals Co., 452-32, Jang-Dong, Chonju, Chonbuk 561-360, Republic of Korea.
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15
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Abstract
The present study aimed to evaluate control efficacy of clonorchiasis by two schemes of repeated treatment with praziquantel at two endemic villages in China. Residents of one village at Guangxi Autonomous Region were treated and examined 6-monthly and of another at Liaoning Province 12-monthly. In residents that took 25 mg/kg x 3 (total 75 mg/kg) of praziquantel every 6 months for one year the egg positive rate showed a significant drop from 69.0% to 17.1%. In contrast, a group of same praziquantel medication once showed a slight marginal decrease in the egg rate from 18.9% to 12.2% after one year. Of 39 subjects examined 3 times, 56.4% were cured, 7.7% persistently positive, one (2.6%) reinfected after cure or newly infected, but 25.6% were persistently negative. The present finding suggests that 6-monthly medication with 75 mg/kg of praziquantel should effectively lower the prevalence but incomplete for control of clonorchiasis in heavy endemic areas.
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Affiliation(s)
- S T Hong
- Department of Parasitology and Institute of Endemic Diseases, Seoul National University College of Medicine and SNUMMC, Seoul 110-799, Korea.
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16
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Hong ST, Lee MY, Kim SR. Molecular cloning of the anther-preferential nonspecific lipid transfer protein cDNA in hot pepper by mRNA differential display. Mol Cells 2001; 11:241-9. [PMID: 11355707] [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: 04/16/2023] Open
Abstract
To better understand the molecular control of anther development, an anther-preferential mRNA was isolated from hot pepper (Capsicum annuum) using mRNA differentially display. Using the displayed fragment as a probe, a full-length cDNA named CaLTP was isolated. A nucleotide sequence analysis of CaLTP revealed that the clone contains an open reading frame of 123 amino acids, which exhibits a 60-23% identity with nonspecific lipid transfer proteins (nsLTP). Northern and RT-PCR analysis of the clone confirmed that CaLTP mRNA was predominant to anther tissues. The basal expression level in the leaves was slightly induced only by abscisic acid (ABA) treatment. Southern analysis reveals that CaLTP is present as a single-copy gene in hot pepper genome. We hypothesize that CaLTP might have an important role in protecting the reproductive tissues from environmental stresses.
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Affiliation(s)
- S T Hong
- Department of Life Science, Sogang University, Seoul, Korea
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17
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Kang SY, Ahn IY, Park CY, Chung YB, Hong ST, Kong Y, Cho SY, Hong SJ. Clonorchis sinensis: molecular cloning and characterization of 28-kDa glutathione S-transferase. Exp Parasitol 2001; 97:186-95. [PMID: 11384162 DOI: 10.1006/expr.2001.4606] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A 28-kDa glutathione S-transferase (Cs28GST) was purified from a Clonorchis sinensis cytosolic fraction through anion-exchange and glutathione-affinity column chromatographies. A monoclonal antibody raised against Cs28GST reacted specifically to the C. sinensis antigen among trematode proteins. A putative peptide of 212 amino residues deduced from a cDNA clone appeared homologous with 28-kDa GST of trematodes, and its secondary structural elements predicted a GSH-binding site. Recombinant Cs28GST showed GST enzyme activity with CDNB substrate and was sensitive to the model inhibitors. The recombinant Cs28GST was antigenically indistinguishable from the native form and was recognized specifically by C. sinensis-infected human sera. The Cs28GST was localized in the tegument and underlying mesenchymal tissues. It is suggested that Cs28GST may play significant physiological roles against bioreactive molecules and be a useful reagent for serodiagnosis of clonorchiasis.
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Affiliation(s)
- S Y Kang
- Department of Parasitology, Faculty of Medicine, Chung-Ang University, Tongjak-gu, Seoul 156-756, Korea
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18
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Yu JR, Pyon JK, Seo M, Jung BS, Cho SR, Lee SH, Hong ST. Localization of cytoskeletal proteins in Pneumocystis carinii by immuno-electron microscopy. Korean J Parasitol 2001; 39:13-21. [PMID: 11301586 PMCID: PMC2721061 DOI: 10.3347/kjp.2001.39.1.13] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Pneumocystis carinii causes serious pulmonary infection in immunosuppressed patients. This study was undertaken to observe the cytoskeletal proteins of P. carinii by immuno-electron microscopy. P. carinii infection was experimentally induced by immunosuppression of Sprague-Dawley rats for seven weeks, and their lungs were used for the observations of this study. The gold particles localized actin, tropomyosin, and tubulin. The actin was irregularly scattered in the cytoplasm of the trophic forms but was much more concentrated in the inner space of the cell wall of the cystic forms called the inner electron-lucent layer. No significant amount of tropomyosin was observed in either trophic forms or cystic forms. The tubulin was distributed along the peripheral cytoplasm and filopodia of both the trophic and cystic forms rather than in the inner side of the cytoplasm. Particularly, in the cystic forms, the amount of tubulin was increased and located mainly in the inner electron-lucent layer of the cell wall where the actin was concentrated as well. The results of this study showed that the cell wall of P. carinii cystic forms is a structure whose inner side is rich in actin and tubulin. The location of the actin and tubulin in P. carinii suggests that the main role of these proteins is an involvement in the protection of cystic forms from the outside environment by maintaining rigidity of the cystic forms.
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Affiliation(s)
- J R Yu
- Department of Parasitology, College of Medicine, Konkuk University, Chungju 380-701, Korea
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19
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Choi MH, Chung BS, Chung YB, Yu JR, Cho SR, Hong ST. Purification of a 68-kDa cysteine proteinase from crude extract of Pneumocystis carinii. Korean J Parasitol 2000; 38:159-66. [PMID: 11002651 PMCID: PMC2721195 DOI: 10.3347/kjp.2000.38.3.159] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The present study intended to verify activities of cysteine proteinase of Pneumocystis carinii from rats and to purify the enzyme. In order to exclude the contamination of host-derived enzymes, concentrates of P. carinii was primarily treated with a mixture of proteinase inhibitors before lysis of P. carinii. A 68-kDa cysteine proteinase was finally purified from the crude extract of P. carinii by 4 sequential chromatographic methods. The enzyme showed an optimal activity at pH 5.5 in 0.1 M sodium acetate, and its activity was specifically inhibited by L-trans-epoxy-succinylleucylamido (4-guanidino) butane (E-64) and iodoacetic acid, suggesting that the enzyme is a cysteine proteinase. The 68-kDa proteinase weakly digested macromolecules such as collagen, hemoglobin and fibronectin. The present study demonstrated the activity of cysteine proteinase at the 68-kDa band of P. carinii, and purified and characterized the molecule.
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Affiliation(s)
- M H Choi
- Department of Parasitology, Seoul National University College of Medicine, Korea
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20
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Chung BS, Pars YK, Huh S, Yu JR, Kim J, Shi X, Cho SR, Lee SH, Hong ST. Genetic heterogeneity of Pneumocystis carinii from rats of several regions and strains. Korean J Parasitol 2000; 38:151-8. [PMID: 11002650 PMCID: PMC2721194 DOI: 10.3347/kjp.2000.38.3.151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Pneumocystis carinii is a major opportunistic pathogen which has been found in the lungs of a wide variety of mammalian host species, and the fact suggests the possibility of intraspecific variation. Until now, P. carinii from different mammalian species are differentiated as subspecies, and the rats are known to be infected by two subspecies. The present study investigated genetic heterogeneity of P. carinii isolates from two strains of rats in Korea and China by molecular karyotyping, RFLP and sequencing analysis. Karyotypes of P. carinii were grouped into three, two from two strains of rats in Korea and one from rats in China. However RFLP of PCR product of ribosomal and MSG gene of the P. carinii isolates showed same pattern. The sequence homology rates of alpha-tubulin DNA of the P. carinii isolates were 96% in Seoul Wistar rats, 93% in Seoul Sprague-Dawley rats, and 85% in Chinese Sprague-Dawley rats. The present finding confirmed that P. carinii from rats in Korea are grouped into two karyotype strains which are different from that of P. carinii from rats in China. The Chinese isolate shows a little different sequences of alpha-tubulin DNA.
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Affiliation(s)
- B S Chung
- Department of Parasitology, Seoul National University College of Medicine, Korea
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21
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Abstract
A 17 kDa protein from Clonorchis sinensis adults was purified by a procedure including Sephacryl S-200 HR gel filtration and Q-Sepharose anion exchange chromatography. The protein was proved to be a cysteine protease as it showed hydrolytic activity toward Cbz-Phe-Arg-AMC in the presence of dithiothreitol and was inhibited by specific inhibitors such as iodoacetic acid or trans epoxy-succinly-L-leucyl-amido(4-guanidino) butane. The polyclonal antibody raised against the protein reacted to 17 kDa proteins of trematodes such as Paragonimus westermani, Fasciola hepatica, Opisthorchis viverrini, Gymnophalloides seoi, and Metagonimus yokogawai. The antibody recognized the 17 kDa and 16 kDa cysteine proteases purified from C. sinensis, P. westermani, and G. seoi as well. These results suggest that the 17 kDa protein may be a cysteine protease commonly present in trematodes.
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Affiliation(s)
- Y B Chung
- Department of Parasitology, Seoul National University College of Medicine, Korea
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22
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Hong ST, Hoistad LM, Corbett JD. La48Br81Os8: isolated clusters in an unusual superstructure with significantly greater intercluster bonding. Inorg Chem 2000; 39:98-104. [PMID: 11229040 DOI: 10.1021/ic990692w] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Exploration of reactions in the La-Br-Z system for Z = Fe, Ru, and Os in welded Nb containers at 900-950 degrees C resulted in only the title phase. The La48Br81Os8 stoichiometry is very close to that of known triclinic Pr6Br10Os but with an approximately 32-times larger cell, 138 independent atoms, and completely different intercluster connectivities in a complex monoclinic superstructure (a = 33.076(5) A, b = 23.466(3) A, c = 23.537(2) A, beta = 110.701(4) degrees, P2(1)/c (No. 14), Z = 4, 23 degrees C). Tetragonally compressed, approximately 16 e- lanthanum octahedra centered by Os are heavily interbridged by Br, including Br(f-a) (f = face) and Br(i-a-a) functions, to increase coordination numbers about some Br (to 4) and La (to 6) and to give an average of 19.63 bonded Br/La6Os vs the usual 18. These result in a cell volume 10% less than for an equivalent (hypothetical) La6Br10Os and Br-Br contacts as short as 3.30 A. Increased polar La-Br interactions presumably drive these changes. Optimal atom sizes for this structure have been found so far only in this novel compound.
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Affiliation(s)
- S T Hong
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA
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23
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Kim SY, Lee GS, Hong ST, Lee JS, Kim SI, Kwak SD. Comparative Study of Pharmacokinetics in the Onset and Offset of Mivacurium and Other Muscle Relaxants. Korean J Anesthesiol 2000. [DOI: 10.4097/kjae.2000.38.5.773] [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)
- Sung Yell Kim
- Department of Anesthesiology, Medical School, Soon Chun Hyang University, Seoul, Korea
| | - Gin Seung Lee
- Department of Anesthesiology, Medical School, Soon Chun Hyang University, Seoul, Korea
| | - Seung Taek Hong
- Department of Anesthesiology, Medical School, Soon Chun Hyang University, Seoul, Korea
| | - Jeong Seok Lee
- Department of Anesthesiology, Medical School, Soon Chun Hyang University, Seoul, Korea
| | - Soon Im Kim
- Department of Anesthesiology, Medical School, Soon Chun Hyang University, Seoul, Korea
| | - Soo Dal Kwak
- Department of Anesthesiology, Medical School, Soon Chun Hyang University, Seoul, Korea
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24
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Abstract
The present study analyzed serum IgG subclass antibody reaction to major antigenic bands of Clonorchis sinensis to investigate improvement of its serodiagnosis. Of the four subclass antibodies, IgG1 and IgG2 antibodies were produced but not specific, IgG3 antibody was least produced, and IgG4 antibody was prominent and specific. The serum IgG antibody reaction to any of 43-50, 34-37, 26-28, and 8 kDa bands was found in 65.5% of 168 egg positive cases while IgG4 antibody reaction was found in 22.0% of them. The positive rates of IgG and IgG4 antibodies were directly correlated with the intensity of infection. All of the sera from heavily infected cases over EPG 5,000 showed positive reaction for specific IgG and IgG4 antibodies. The specific serum IgG4 antibody disappeared within 6 months after treatment. The bands of 35 kDa and 67 kDa cross-reacted with IgG antibodies but not with IgG4 antibodies in sera of other trematode infections. The present findings suggest that serum IgG4 antibody reaction to 8 kDa band is specific but not sensitive. Any method to increase its sensitivity is required for improved serodiagnosis.
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Affiliation(s)
- S T Hong
- Department of Parasitology, Seoul National University College of Medicine, Korea
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25
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Kho WG, Park YH, Chung JY, Kim JP, Hong ST, Lee WJ, Kim TS, Lee JS. Two new genotypes of Plasmodium vivax circumsporozoite protein found in the Republic of Korea. Korean J Parasitol 1999; 37:265-70. [PMID: 10634043 PMCID: PMC2733204 DOI: 10.3347/kjp.1999.37.4.265] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The gene encoding Plasmodium vivax circumsporozoite protein (PvCSP) exhibits polymorphism in many geographical isolates. The present study was designed to investigate polymorphism in PvCSP gene of P. vivax isolates in Korea. Thirty isolates, obtained from indigenous cases in Yonchon-gun, Kyonggi-do in 1997, were subjected for sequencing and RFLP analysis of the repeat and post-repeat regions of PvCSP gene and two genotypes (SK-A and SK-B) were identified. The genotype of 19 isolates was SK-A and that of 11 isolates was SK-B. Although the number of 12-base repeats present in SK-A was three while two were found in a Chinese strain CH-5, the repeat sequence of SK-A was identical to that of CH-5 except for one base substitution. Compared with known data there was no identical isolates with SK-B, but the sequence of SK-B was similar to that of a North Korean (NK) isolate. These results indicate that two genotypes of PvCSP coexist in the present epidemic area of Korea and the present parasite may originate from East Asia. RFLP would be useful to classify genotypes of P. vivax population instead of gene sequencing.
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Affiliation(s)
- W G Kho
- Department of Parasitology, Inje University College of Medicine, Pusan, Korea.
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26
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Abstract
Pneumocystis carinii is the most important opportunistic pathogen of humans in the world. Pneumocystis carinii is experimentally detected in the lungs of rats, mice, rabbits, and monkeys, however, the organisms from different mammals are identical in microscopic morphology. The present study tried to find out more mammalian hosts of P. carinii and also to differentiate the organisms from different mammals by karyotyping. Rats, mice, hamsters, rabbits, cats, and dogs were successfully infected by P. carinii, but guinea pigs and pigs were not. Karyotype of P. carinii from rabbits showed similar size range of chromosomes with that of the prototype, but in different pattern. The patterns from cats and dogs were also different from that of rats. The present study confirms that cats and dogs are infected by P. carinii and at least total three karyotype strains of P. carinii are proven in Korea.
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Affiliation(s)
- S R Cho
- Department of Thoracic and Cardiovascular Surgery, Inha University Medical Center, Sungnam, Korea
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27
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Abstract
Pneumocystis carinii is a pulmonary pathogen of immunocompromised humans or other mammals. Its infection results from activation of organisms involved in latent infection or from new infection through the air. Almost all children are known to be infected within 2 to 4 years of birth, though prenatal transplacental transmission has not yet been demonstrated. In this study we observed experimental P. carinii infection in neonatal rats, thus investigating the possibility of transplacental vertical transmission by Diff-Quik staining of the lung impression smears and in-situ hybridization for lung sections. The positive rate of P. carinii infection in immunosuppressed maternal rats was 100%, but that in normal maternal rats was 0%. Cystic forms of P. carinii were observed in three of six 1-week old neonatal rats born of heavily infected mothers, but none of them was positive by in-situ hybridization. Five weeks after birth, cystic forms were detected in four neonatal rats. In the lobes of the lungs, no predilection site of P. carinii was recognized. Counts of cystic forms on smears and the reactivity of in-situ hybridization in the lungs of neonatal rats were significantly lower than in maternal rats. The present findings suggest that P. carinii is rarely transmitted through the placenta and proliferates less successfully in the lungs of neonatal rats than in mothers.
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Affiliation(s)
- S T Hong
- Department of Parasitology, Seoul National University College of Medicine, Korea.
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28
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Park HY, Lee SU, Chae SW, Huh S, Yu JR, Kim J, Hong ST. Variation of antigenicity and serological reaction to Pneumocystis carinii in Korea. Korean J Parasitol 1999; 37:109-15. [PMID: 10388269 PMCID: PMC2733055 DOI: 10.3347/kjp.1999.37.2.109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The present study observed the variation of antigenicity of Pneumocystis carinii and serum IgG antibody reaction to the antigens from different localities in Korea. Antigens of rat P. carinii and sera of inhabitants were collected at Chunchon. Chungju, Kwangju, and Seoul during 1995-1996. Enzyme-linked Immunosorbent Assay and immunoblot were used for immune reaction. Absorbance of 1,294 human sera ranged between 0.01 and 0.93. Sera from Chunchon showed higher absorbances than those from other areas. Immunoblotting revealed IgG antibody reactions to 116, 100, and 45-55 kDa antigenic bands of rat P. carinii, but the frequencies of positive reaction to individual bands were variable by localities. Total 62.6% of the sera showed the reaction to 116 kDa band while 37.7% reacted to 100 kDa band and 32.0% to 45-55 kDa bands. For the reaction to 116 kDa, the reaction rate was 60.0% to 82.6% by localities. It is found that the reaction rates of the human sera to rat P. carinii antigen are variable according to the localities. Also, the high molecular antigen of 116 kDa of rat P. carinii is the most frequent antigenic band reacting to human sera.
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Affiliation(s)
- H Y Park
- Department of Parasitology, College of Medicine, Hallym University, Chunchon, Korea
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29
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Choi D, Lim JH, Kim SK, Kim EY, Lee M, Hong ST. Long-lasting sonographic and histopathological findings in cured clonorchiasis of rabbits. Korean J Parasitol 1999; 37:77-83. [PMID: 10388265 PMCID: PMC2733060 DOI: 10.3347/kjp.1999.37.2.77] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
To ascertain residual sonographic and histopathological findings of clonorchiasis after treatment, the present study evaluated sonographic findings in rabbits which were infected with 500 metacercariae of C. sinensis every 6 months for 18 months after treatment with praziquantel. The sonographic findings were analyzed in terms of intrahepatic bile duct dilatation and periductal echogenicity, and histopathological findings were observed after the last sonographic examination. Compared with the sonographic findings before treatment, dilatation of the intrahepatic bile ducts became mild to some degree in four of the seven cases and increased periductal echogenicity resolved in four of them. The histopathological specimens after 18 months showed that periductal inflammation has almost resolved but moderate dilatation of the intrahepatic ducts and mucosal hyperplasia persisted. The periductal fibrosis minimally resolved. The long-lasting sonographic findings in cured clonorchiasis make sonography less specific.
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Affiliation(s)
- D Choi
- Department of Parasitology, Seoul National University College of Medicine and Medical Research Center, Korea
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30
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Abstract
Since 1993, the number of vivax malaria cases has increased every year in the northern part of the Republic of Korea (ROK). This study was designed to characterize factors related to the reemergence of malaria in the ROK. A total of 21 cases diagnosed in 1993 and 1994 distributed sporadically in the narrow zone along the demilitarized zone (DMZ). Of total 317 civilian inhabitant cases reported in 1994-1997, 287 cases were studied and 80.8% of them resided within 10 km from the southern border of the DMZ. The frequency distribution of anti-Plasmodium vivax antibody titers using indirect fluorescent antibody test was compared in three villages in relation with distance from the DMZ. The number of inhabitants with high antibody titers was larger in the village nearest to the border than that in more distant villages. The present results highly suggested that the reemerging vivax malaria start in the border area, most possibly caused by infected mosquitoes which flew across the border. This pattern of transmission repeated year after year.
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Affiliation(s)
- W G Kho
- Department of Parasitology, Inje University College of Medicine, Pusan, Korea.
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31
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Kook J, Lee HJ, Kim BI, Yun CK, Guk SM, Seo M, Park YK, Hong ST, Chai JY. Toxoplasma gondii antibody titers in sera of children admitted to the Seoul National University Children's Hospital. Korean J Parasitol 1999; 37:27-32. [PMID: 10188380 PMCID: PMC2733046 DOI: 10.3347/kjp.1999.37.1.27] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A total of 542 children under 10 years of age, admitted to the Seoul National University Children's Hospital, was examined for antibody titers of Toxoplasma gondii using indirect latex agglutination (ILA) test. Among them, 7.7% showed positive titers higher than 1:32, without significant difference between males (7.3%) and females (8.5%). The seropositive rate increased with age although the statistical significance was negligible (0.05 < P < 0.1). By residential areas, the prevalence appeared higher among children from southern provinces (Kyongsang-do and Cholla do) than those from other areas, but the statistical significance was also very low (0.05 < P < 0.1). When the seropositive cases were analyzed by coincidental diseases, the prevalence was significantly higher in patients with congenital diseases than in patients with non-congenital diseases (P < 0.05). The results showed that the seropositive rate of toxoplasmosis in children examined was not high compared with other endemic countries. Some correlations are suggested between toxoplasmosis and congenital anomalies in Korea.
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Affiliation(s)
- J Kook
- Department of Parasitology, Seoul National University College of Medicine, Korea
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32
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Hong ST, Yoon K, Lee M, Seo M, Choi MH, Sim JS, Choi BI, Yun CK, Lee SH. Control of clonorchiasis by repeated praziquantel treatment and low diagnostic efficacy of sonography. Korean J Parasitol 1998; 36:249-54. [PMID: 9868890 PMCID: PMC2732964 DOI: 10.3347/kjp.1998.36.4.249] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In Korea, Clonorchis sinensis infection is still highly prevalent because case detection in the field is difficult and the detected cases used to be incompletely cured due to treatment failure. The present study tried to control clonorchiasis in an endemic village by repeated treatments with praziquantel every 6 months and to evaluate sonography as a diagnostic measure. By stool examinations, the egg positive rate in the endemic village was 22.7%, but it decreased to 19.6% at 6 months, 15.1% at 12 months. 12.2% at 18 months, 6.3% at 24 months, 11.4% at 30 months, and 6.3% at 42 months after the beginning of repeated praziquantel administration. The sonography showed 61 (49.6%) positive cases of 123 screened residents: among egg-positives the sonography positive rate was 52.2% and among egg-negatives it was still 49%. The rate among cured cases was 64.3% after 6 months, 50.0% after 12 months, 50.0% after 18 months, and 66.7% after 24 months. In a non-endemic village, 64 residents were found egg-negative by fecal examination, but 20 (31.3%) of them were positive by sonography. The present findings indicate that control of clonorchiasis in an endemic village by repeated praziquantel treatment for 42 months is still insufficient and sonography is of little value for diagnosis of clonorchiasis.
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Affiliation(s)
- S T Hong
- Department of Parasitology, Seoul National University College of Medicine, Korea.
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33
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Hong ST, Yun KS, Lee M, Seo M, Shin JS, Choi BI, Yun CK, Lee SH. Repeated treatment of clonorchiasis monitored by fecal examination and sonography. Parasitol Int 1998. [DOI: 10.1016/s1383-5769(98)80659-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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34
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Hong ST, Lee M, Sung NJ, Lee SH. Serum IgG subclass antibodies in clonorchiasis. Parasitol Int 1998. [DOI: 10.1016/s1383-5769(98)80745-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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35
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Hong ST, Park YK, Kim J, Kim DH, Lee SH. Pneumocystis carinii: delayed proliferation was observed in neonatal rat model. Parasitol Int 1998. [DOI: 10.1016/s1383-5769(98)80506-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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36
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Lee M, Cho SR, Park YK, Choi MH, Hong ST. The effect of heterogeneous hyperimmune IgG antibody on prophylaxis and treatment of Pneumocystis carinii infection in rats. Korean J Parasitol 1998; 36:127-32. [PMID: 9637830 DOI: 10.3347/kjp.1998.36.2.127] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Immunotherapy has been used in support of trimethoprim-sulfamethoxazole treatment for Pneumocystis carinii pneumonia. The present study investigated the therapeutic or preventive effects of heterogeneous hyperimmune IgG antibody (HIA) in experimental rats. Their immunity was suppressed by steroid injection, and they were also injected peritoneally with HIA which reacted with 40-55, 92, 116, and 200 kDa bands of the crude antigen. All rats were infected by P. carinii and the cystic forms on lung impression smears were counted. The count was 20.5-76.5 (mean 52.5 + 19.3) in those which received steroid only, but decreased to 6.0-21.0 (mean 13.5 + 10.6) in those of group 3 which received HIA for the same duration. In other groups, the mean count ranged from 29.9 + 32.9 to 54.1 + 47.7, and in those which received 13.7 mg HIA the reduction effect was greater than in those which received 6.8 mg or 20.5 mg HIA. The present finding confirmed that in rats during the early stage of infection, the heterogeneous HIA to MSG antigen bands had a partial effect on P. carinii pneumonia, both prophylactically and therapeutically.
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Affiliation(s)
- M Lee
- Department of Parasitology, Seoul National University College of Medicine, Korea
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37
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Siddique T, Pericak-Vance MA, Caliendo J, Hong ST, Hung WY, Kaplan J, McKenna-Yasek D, Rimmler JB, Sapp P, Saunders AM, Scott WK, Siddique N, Haines JL, Brown RH. Lack of association between apolipoprotein E genotype and sporadic amyotrophic lateral sclerosis. Neurogenetics 1998; 1:213-6. [PMID: 10737125 DOI: 10.1007/s100480050031] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Amyotrophic lateral sclerosis (ALS) is a neuro-degenerative disorder with both sporadic and familial forms. Approximately 20% of autosomal dominant ALS is caused by mutations in the Cu/Zn superoxide dismutase (SOD1) gene. The causes of the remaining forms of ALS are unknown. The apolipoprotein E (APOE) gene is a known genetic risk factor for Alzheimer disease (AD), another neuro-degenerative disease. The APOE-4 allele increases risk and decreases age at onset in AD. Studies examining ALS and APOE have failed to show a significant effect of APOE on overall risk in ALS. Studies examining the effect of APOE-4 on site of onset in ALS (bulbar or limb) have been contradictory, with some studies showing an APOE association with bulbar onset and others showing no effect. Sample size was limited in these previous reports, particularly with respect to the number of bulbar onset cases (n = 33, 34 and 53). The present study examines a large collaborative data set of ALS patients (n = 363; 95 with bulbar onset) and age-matched neurologically normal controls. The results for these data showed no significant differences in the percentage of subjects with the APOE-4/4 and APOE-4/X genotypes (X = APOE-2 or APOE-3) when comparing cases and controls in both the overall data set or in the data set stratified by site of onset. Similarly, logistic regression analysis in the overall and stratified data set while controlling for sex showed no increase or decrease in risk of ALS associated with the APOE-4 allele. In addition, there were no significant differences in age at onset between patients with APOE-X/X, and APOE-4/4 or APOE-4/X genotypes, overall or stratified by site of onset. We conclude based on these data that the APOE gene is not a major genetic risk factor for site of onset in ALS.
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Affiliation(s)
- T Siddique
- Neurology Department, Northwestern University Medical School, Chicago, IL 60611, USA
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38
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Hong ST, Cho YS, Surh YJ, Chung AS. Inhibitory effect of hemin on mutagenicity of the electrophilic sulfuric acid ester of 6-hydroxymethylbenzo[a]pyrene. Chem Biol Interact 1998; 109:255-65. [PMID: 9566750 DOI: 10.1016/s0009-2797(97)00137-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In the present study, we examined the effects of hemin on the mutagenicity of 6-sulfooxymethylbenzo[a]pyrene (SMBP) in Salmonella typhimurium TA98 and Chinese hamster lung fibroblast (V79) cells. The compound was tested for the possible chemoprotective activity against mutagenesis induced by SMBP and its precursor, 6-hydroxymethylbenzo[a]pyrene (HMBP), activated by hepatic cytosol and PAPS in S. typhimurium TA98. Hemin not only inhibited the mutagenic activity of SMBP in V79 cells but repressed the cytotoxicity induced by this reactive ester as demonstrated by increased cell growth. The intracellular accumulation of radioactivity in V79 cells exposed to [3H]SMBP was reduced by approximately 50% when hemin (10 microM) was added to the medium. Likewise, the formation of SMBP-DNA adducts in these cells was significantly attenuated by treatment with hemin. The covalent complex formation of hemin with SMBP was confirmed by solvent extraction and reverse-phase HPLC.
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Affiliation(s)
- S T Hong
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Taejon, Japan
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Abstract
The genes for most of the biosynthesis of the kinamycin antibiotics have been cloned and heterologously expressed. Genomic DNA of Streptomyces murayamaensis was partially digested with MboI and a library of approximately 40 kb fragments in E. coli XL1-BlueMR was prepared using the cosmid vector pOJ446. Hybridization with the actI probe from the actinorhodin polyketide synthase genes identified two clusters of polyketide genes. After transferal of these clusters to S. lividans ZX7, expression of one cluster was established by HPLC with photodiode array detection. Peaks were identified from the kin cluster for dehydrorabelomycin, kinobscurinone, and stealthin C, which are known intermediates in kinamycin biosynthesis. Two shunt metabolites, kinafluorenone and seongomycin were also identified. The structure of the latter was determined from a quantity obtained from large-scale fermentation of one of the clones.
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Affiliation(s)
- S J Gould
- Department of Biochemistry and Biophysics, Oregon State University, Corvallis 97331-4003, USA
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Abstract
Clonorchis sinensis is a liver fluke which is the most prevalent helminth of humans in Korea. The better diagnostic measure of clonorchiasis is required for its nationwide control program. The present study observed antigenic bands of C. sinensis and reacting immunoglobulins in serum of infected residents. Adult C. sinensis were recovered from experimentally infected rabbits and soluble crude extract of the worms was used as the antigen after supplementation of E-64, a cysteine proteinase inhibitor. SDS-PAGE of the crude antigen resolved more than 20 protein bands between 200 and 14 kDa. The sera of infected humans collected at an endemic village showed specific IgG and IgE antibodies but little IgM and IgA antibodies. The protein bands of 94, 80, 72, 68, 52, 47, 43, 37, 34, and 28-25 kDa strongly reacted with serum Ig(GMA) or IgG antibody and 64, 62, 52, 47, 44, 34, 28, and 26 kDa bands reacted with serum IgE antibody. However, the 94, 80, 72, 68, 64, 62, 52, 47, and 40 kDa bands of C. sinensis antigen were found non-specific. The protein bands of 43, 34, and 28-25 kDa of C. sinesis are primary target molecules of further analysis.
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Affiliation(s)
- S T Hong
- Department of Parasitology, Seoul National University College of Medicine, Korea
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41
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Lee M, Lee JK, Kim SB, Lee SH, Hong ST. Skin ulcer and immunoblot patterns by inoculation sites in BALB/c mice infected with Leishmania major. Korean J Parasitol 1997; 35:31-8. [PMID: 9100437 DOI: 10.3347/kjp.1997.35.1.31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The skin ulcer in Leishmania major infection is known to be variable according to the inoculation sites even in a susceptible host. The present study traced the immunoblot patterns by the site of inoculation and duration of infection in BALB/c mice. L. major were subcutaneously inoculated on the nose, footpad, and back of the mice, in a dose of 3 x 10(6) promastigotes. Sera of the mice were collected every 10 days after inoculation. SDS-PAGE separated soluble protein bands of the promastigotes and immunoblot was carried out with the infection sera. The skin ulcer first appeared on the nose at 15 days, and on the footpad at 17 days after inoculation. The ulcer on the back appeared after 90 days. In the mice with ulcer on the nose or footpad, serum IgG antibody reacted to 202, 139, 98, 83, 81, 67 65, 62, 59, 54, 52, 42, 26 and 23 kDa bands at 20 days after inoculation. In mice inoculated on the back, however, the immunoblot showed visible reactions with 202, 83, 81, 74, 67, 65, 62, 59, 54, 52, 20 and 17 kDa bands at 90 days after inoculation. The present result showed that the antigenic protein bands of L. major promastigotes were differed by the inoculation site and duration of infection. Since the skin ulcer and the serum antibodies to antigenic bands between 67-52 kDa appeared simultaneously, it is suggested that the serum IgG antibodies may play a role in formation of the skin ulcer in BALB/c mice.
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Affiliation(s)
- M Lee
- Department of Parasitology, Seoul National University College of Medicine, Korea
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42
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Hong ST, Carney JR, Gould SJ. Cloning and heterologous expression of the entire gene clusters for PD 116740 from Streptomyces strain WP 4669 and tetrangulol and tetrangomycin from Streptomyces rimosus NRRL 3016. J Bacteriol 1997; 179:470-6. [PMID: 8990300 PMCID: PMC178718 DOI: 10.1128/jb.179.2.470-476.1997] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The genes for the complete pathways for two polycyclic aromatic polyketides of the angucyclinone class have been cloned and heterologously expressed. Genomic DNAs of Streptomyces rimosus NRRL 3016 and Streptomyces strain WP 4669 were partially digested with MboI, and libraries (ca. 40-kb fragments) in Escherichia coli XL1-Blue MR were prepared with the cosmid vector pOJ446. Hybridization with the actI probe from the actinorhodin polyketide synthase genes identified two clusters of polyketide genes from each organism. After transfer of the four clusters to Streptomyces lividans TK24, expression of one cluster from each organism was established through the identification of pathway-specific products by high-performance liquid chromatography with photodiode array detection. Peaks were identified from the S. rimosus cluster (pksRIM-1) for tetrangulol, tetrangomycin, and fridamycin E. Peaks were identified from the WP 4669 cluster (pksWP-2) for tetrangulol, 19-hydroxytetrangulol, 8-O-methyltetrangulol, 19-hydroxy-8-O-methyltetrangulol, and PD 116740. Structures were confirmed by 1H nuclear magnetic resonance spectroscopy and high-resolution mass spectrometry.
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Affiliation(s)
- S T Hong
- Department of Biochemistry and Biophysics, Oregon State University, Corvallis 97331-4003, USA
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43
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Abstract
Differentiation of invasive strains of Entamoeba histolytica according to their pathogenicity has been a topic of long debate, but now the pathogenic species only is regarded as E. histolytica while the non pathogenic species is E. dispar. The present study applied immunoblot to differentiate infections of the two species among microscopically-detected cyst-passers in Korea. The crude extract of E. histolytica separated in 5.20% gradient gels, revealed many fractions of 94, 81, 71, 50, 44, 38.5, 37.5, 29, 19, and 18 kDa when the cysteine proteinase inhibitor, E64, was supplemented. The scrum IgG antibody of 3 proven E, histolytica cases reacted with the antigenic fractions of 117, 110, 99, 68, 66, 60, 54, 52, 46, and 45 kDa. Sera of PCR confirmed 3 cases of E. dispar reacted only to the 117 kDa fraction of the E. histolytica crude extract which was regarded as non-specific. To the antigen of monoxenic E. dispar, sera of E. dispar and E. histolytica cases showed the same immunoblot reactions. The serum IgA antibody reacted with several antigenic fractions of both E. histolytica and E. dispar, but IgM and IgE antibodies showed no reaction to either antigen. Sera of 24 symptomless amebic cyst passers were screened with the E. histolytica antigen; two were found to be infected by E. histolytica and 22 were by E. dispar. The present findings suggest that in Korea most of asymptomatic cyst passers of E. histolytica are carriers of E. dispar. Immunoblot using E. histolytica antigen is a good technique for the differentiation of E. histolytica and E. dispar infections.
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Affiliation(s)
- M Lee
- Department of Parasitology, Seoul National University College of Medicine, Korea
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44
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Hong SJ, Lee DH, Hong ST, Chai JY, Lee SH. Surface ultrastructure of the cercaria of Neodiplostomum seoulense (Trematoda: Neodiplostomidae). J Parasitol 1996; 82:837-40. [PMID: 8885899] [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: 02/02/2023] Open
Abstract
The surface ultrastructure of Neodiplostomum seoulense cercariae was studied by scanning electron microscopy. The cercarial body was cylindrical and its tail bifurcated. Short tegumental spines, with a broad base and single pointed tip, were dense anteriorly but sparse posteriorly on the lateral margins of the body. The acetabulum had stout spikelike spines, centripetally oriented on the inner surface. Sensory papillae, each with a short cilium, were concentrated around the oral sucker; they could be tangoreceptors or chemoreceptors, or both. Many sensory papillae, each with a long cilium, were observed on the tail; these might be rheo- or tangoreceptors. It is suggested that the sensory papillae of N. seoulense cercariae provide for attachment and penetration into the skin of tadpoles, which are the second intermediate host.
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Affiliation(s)
- S J Hong
- Department of Parasitology, Chang-Ang University College of Medicine, Dongjak-gu, Seoul, Republic of Korea
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45
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Kim J, Yu JR, Hong ST, Park CS. Detection of Pneumocystis carinii by in situ hybridization in the lungs of immunosuppressed rats. Korean J Parasitol 1996; 34:177-84. [PMID: 8843693 DOI: 10.3347/kjp.1996.34.3.177] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
In situ hybridization was performed to detect rat Pneumocystis carinii in the lung sections. Rats were immunosuppressed by weekly subcutaneous injection of 10 mg/kg methylprednisolone. On the 6th, 8th and 9th week of immunosuppression, the lungs were removed and fixed in 10% neutral formalin. A 22 base oligonucleotide probe complementary to P. carinii 5S ribosomal RNA was commercially synthesized and its 3' terminal was labeled with biotin. In situ hybridization was performed utilizing manual capillary action technology on the Microprobe system. P. carinii were detected along the luminal surface of alveolar pneumocytes, in exudate of alveolar cavities, and also in secretory material of bronchioles. In the 6th week group, positive reaction was observed focally in the peripheral region of the lung sections, but the reaction was observed diffusely in the 8th or 9th week groups. In comparison with Grocott's methenamine silver stain, in situ hybridization technique can detect the organism rapidly, and can detect trophic forms very well. Furthermore, no nonspecific reaction with other pathogenic fungi and protozoa was recognized. Therefore, in situ hybridization can be a good technique to detect P. carinii in the lungs of infected rats.
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Affiliation(s)
- J Kim
- Department of Pathology, Chonnam University Medical School, Kwangju
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46
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Hong ST. PCR in diagnosis of pneumocystosis of rats. Korean J Parasitol 1996; 34:191-6. [PMID: 8843695 DOI: 10.3347/kjp.1996.34.3.191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Polymerase chain reaction (PCR) is a powerful technique to detect scanty amount of DNA from living organisms. The present study intended to develop specific primers for PCR diagnosis of pneumocystosis and to evaluate diagnostic efficacy by preparation of template DNAs from invasive BAL fluid and also to screen serum or blood as a non-invasive specimen. Albino rats of Wistar or Fischer strains were experimentally infected by Pneumocystis carinii. Extracted DNAs or cell lysates of their blood, bronchoalveolar lavage fluid, and lung homogenate were used as the template DNA. Primers were synthetic oligonucleotides among 16s rDNA sequences. All of the primer combinations gave PCR products, but the primer pair of #24 and #27 gave best quality product of 666 bp. The sensitivity of PCR with lysates of BAL fluid was 57.7% but it increased to 84.6% with extracted DNAs. None of BAL lysate or DNA was positive among 13 microscopically negatives. The serum DNAs were positive only in 2 cases out of 20 morphologically positive rats. DNAs of human, rat, other parasites, yeast, and microorganisms were negative. The findings suggest that the present primers are specific but simple lysate of BAL fluid is not sensitive. PCR may be used as a routine diagnostic method of pneumocystosis if simple and rapid preparation of non-invasive clinical specimens are available.
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Affiliation(s)
- S T Hong
- Department of Parasitology, Seoul National University College of Medicine, Korea
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47
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Choe SC, Lee M, Lee SK, Im K, Tannich E, Lee SH, Hong ST. Differentiation of Korean isolates of Entamoeba histolytica from Entamoeba dispar. Korean J Parasitol 1996; 34:15-20. [PMID: 8820737 DOI: 10.3347/kjp.1996.34.1.15] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Cysts of Entamoeba histolytica are still found from humans in Korea, but not all of the cysts are known as pathogenic. The non-pathogenic strain is regarded as a different species, E. dispar. In this study, Korean isolates of conventional E. histolytica were subjected for the differentiation by polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP) analysis. Human stools were screened by routine microscopic examination, and cyst or trophozoite positive stools were inoculated into Robinson media. The cultivated trophozoite positive stools were inoculated into Robinson media. The cultivated trophozoites were prepared for DNA extraction, and the DNAs were used for PCR with common primers of P1 gene. The PCR products were digested with 3 restriction enzymes and RFLP was observed. Also anti-sense primers containing the cleavage site of each restriction enzyme were designed for differentiation only by PCR. The PCR products of Korean isolates S9, S12, YS-6, and YS-27 were spliced by Taq I and Xmn I but not by Acc I, and the isolates S1, S3, S11, S15, S16, S17, S20, YS-17, and YS-44 were spliced by Acc I but not by Taq I and Xmn I. These RFLP pattern correlated well with PCR products by the species specific primers. The findings confirm that the Korean isolates S9, S12, YS-6, and YS-27 are E. histolytica and others are E. dispar. In Korea, most of the asymptomatic cyst carriers are infected by E. dispar, not by E. histolytica.
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Affiliation(s)
- S C Choe
- Department of Parasitology and Institute of Endemic Diseases, Seoul National University College of Medicine, Korea
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48
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Abstract
Schistosomiasis is a snail-transmitted trematodiasis acquired by immersion in water which contains the cercariae. In Korea, six imported cases of urinary schistosomiasis by Schistosoma haematobium and one case of imported cerebral schistosomiasis by S. mansoni were reported. Herein we report a case of S. mansoni infecting rectum of a 46 year-old Korean male, who had been to Saudi Arabia for two years. On colonoscopy for routine physical check up, a 0.4 cm polyp in the rectum was detected and biopsy was done. Microscopically, rectal mucosa showed several granulomas which were composed of macrophages, lymphocytes, neutrophils and eosinophils. The center of each granuloma showed an ovoid egg often containing miracidium. The eggs measured 130 x 60 microns in average size. They had yellowish-brown transparent shell with the characteristic lateral spine. This is the 8th imported case of schistosomiasis in Korea and the second one infected by S. mansoni.
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Affiliation(s)
- S D Lim
- Department of Pathology, Seoul National University College of Medicine
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49
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Affiliation(s)
- S T Hong
- Department of Parasitology, Seoul National University College of Medicine, Korea
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50
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Hong ST, Lee M, Seo M, Choo DH, Moon HR, Lee SH. Immunoblot analysis for serum antibodies to Pneumocystis carinii by age and intensity of infection in rats. Korean J Parasitol 1995; 33:187-94. [PMID: 8528625 DOI: 10.3347/kjp.1995.33.3.187] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The present study aims to observe changing patterns of serum antibody to Pneumocystis carinii in normal rats of different ages and in immunosuppressed rats. The serum IgG antibody was observed by immunoblotting with crude antigen of P. carinii which were purified from the lungs of infected rats. The crude antigens separated in SDS-PAGE resolved more than 20 protein bands from 20 to 200 kDa. Of them, 40-45, 50-55, 116 and 200 kDa bands were major antigens of P. carinii. Most of the normal rats of up to 4 weeks had the antibodies reacting the 4 bands, but none of 8-week-old rats revealed the specific antibody. After the rats grew for 40 weeks, all were found to have the antibody in their serum. Same pattern of serum antibody level by age was found in ELISA. When immunosuppressed rats became heavily infected, the antibody in their serum decreased distinctively. The present results suggest that antibodies in normal newborn rats are transferred from their mother and lowered up to 8 weeks. Thereafter, the levels of the antibodies begin to increase by natural exposure to P. carinii. It was also confirmed that the intensity of P. carinii infection is inversely related with levels of serum antibodies.
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Affiliation(s)
- S T Hong
- Department of Parasitology, Seoul National University College of Medicine, Korea
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