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Park YJ, Heo J, Kim Y, Cho H, Shim M, Im K, Lim W. Glucocorticoids alleviate particulate matter-induced COX-2 expression and mitochondrial dysfunction through the Bcl-2/GR complex in A549 cells. Sci Rep 2023; 13:18884. [PMID: 37919369 PMCID: PMC10622527 DOI: 10.1038/s41598-023-46257-y] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 10/30/2023] [Indexed: 11/04/2023] Open
Abstract
Exposure to particulate matter (PM) causes mitochondrial dysfunction and lung inflammation. The cyclooxygenase-2 (COX-2) pathway is important for inflammation and mitochondrial function. However, the mechanisms by which glucocorticoid receptors (GRs) suppress COX-2 expression during PM exposure have not been elucidated yet. Hence, we examined the mechanisms underlying the dexamethasone-mediated suppression of the PM-induced COX-2/prostaglandin E2 (PGE2) pathway in A549 cells. The PM-induced increase in COX-2 protein, mRNA, and promoter activity was suppressed by glucocorticoids; this effect of glucocorticoids was antagonized by the GR antagonist RU486. COX-2 induction was correlated with the ability of PM to increase reactive oxygen species (ROS) levels. Consistent with this, antioxidant treatment significantly abolished COX-2 induction, suggesting that ROS is involved in PM-mediated COX-2 induction. We also observed a low mitochondrial membrane potential in PM-treated A549 cells, which was reversed by dexamethasone. Moreover, glucocorticoids significantly enhanced Bcl-2/GR complex formation in PM-treated A549 cells. Glucocorticoids regulate the PM-exposed induction of COX-2 expression and mitochondrial dysfunction and increase the interaction between GR and Bcl-2. These findings suggest that the COX-2/PGE2 pathway and the interaction between GR and Bcl-2 are potential key therapeutic targets for the suppression of inflammation under PM exposure.
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Affiliation(s)
- Yeon-Ji Park
- Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, Republic of Korea
- Department of Biomedical Sciences, Graduate School of Ajou University, Suwon, Republic of Korea
| | - June Heo
- Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, Republic of Korea
- Department of Biomedical Sciences, Graduate School of Ajou University, Suwon, Republic of Korea
| | - Yonghyeon Kim
- Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, Republic of Korea
- Department of Biomedical Sciences, Graduate School of Ajou University, Suwon, Republic of Korea
| | - Hyeseong Cho
- Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, Republic of Korea
- Department of Biomedical Sciences, Graduate School of Ajou University, Suwon, Republic of Korea
| | - Myeongkuk Shim
- BL Healthcare, Yongin-si, Gyeonggi-do, 16827, South Korea
| | - Kyunghyun Im
- BL Healthcare, Yongin-si, Gyeonggi-do, 16827, South Korea
| | - Wonchung Lim
- Department of Sports Medicine, College of Health Science, Cheongju University, Cheongju, 28503, South Korea.
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2
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Park SJ, Lee M, Yun JM, Kim D, Oh DH, Kim J, Shim M, Oh HJ, Lee J. Deer Velvet and Eleutherococcus senticosus Mixture Regulated Immune Function in C57BL/6N Mice with Immunosuppression Induced by Forced Swimming. J Med Food 2021; 24:1213-1221. [PMID: 34792393 DOI: 10.1089/jmf.2021.k.0060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Immunosuppression occurs in response to a variety of external antigens. However, various immune cells and cytokines can activate the immune system. In this study, it was found that fermented deer velvet (FD) and fermented Eleutherococcus senticosus (FE) extract (FDE) mixtures regulated the immunity of animals that underwent induced immunosuppression through forced swimming exercise (FSE). Seven mouse treatment groups were included in the experiment: normal controls, FSE controls, positive controls (FSE+red ginseng 300 mg/kg body weight), FD200 (FSE+FD 200 mg/kg body weight), FE200 (FSE+FE 200 mg/kg body weight), FDE50 (FSE+FDE 50 mg/kg body weight), and FDE200 (FSE+FDE 200 mg/kg body weight). Oral intake of experimental and control substances lasted for 2 weeks. Oral FDE intake increased cell counts for major histocompatibility complex (MHC) I, MHC II, CD4(+) T cells, and CD8(+) T cells compared with controls. Moreover, FDE increased Th1 (interleukin [IL]-2 and interferon gamma) cytokine proliferation, T cell proliferation, IL-12 and IL-15 production, and natural killer cell activity compared with controls. In addition, FDE inhibited Th2 cytokines (IL-4, IL-6, IL-10, and tumor necrosis factor alpha) and nitric oxide production, increased B cell proliferation and leukocyte count, and promoted immunoglobulin A and G serum levels compared with controls. Thus, the finding that FDE increased immune function in an immunosuppression model suggests that FDE has immunomodulatory capacity.
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Affiliation(s)
- Soo-Jeung Park
- Department of Medical Nutrition, Kyung Hee University, Yongin, Korea
| | - Minhee Lee
- Department of Medical Nutrition, Kyung Hee University, Yongin, Korea
| | - Jeong-Moon Yun
- Department of Medical Nutrition, Kyung Hee University, Yongin, Korea
| | - Dakyung Kim
- Department of Medical Nutrition, Kyung Hee University, Yongin, Korea
| | - Dong Hwan Oh
- Department of Medical Nutrition, Kyung Hee University, Yongin, Korea
| | | | | | - Hee-Jin Oh
- R&D Center, Green Store, Inc., Seongnam, Korea
| | - Jeongmin Lee
- Department of Medical Nutrition, Kyung Hee University, Yongin, Korea
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3
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Yang P, Shim M, Kang S, Kim S, Kim W, Moon J, Sung J, Kim I, Lim S, Cha D, Lip G, Joung B. Incidence of atrial fibrillation in cancer patients according to cancer type. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3271] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background and objectives
The prevalence of both atrial fibrillation (AF) and cancer are increasing especially in the elderly. The occurrence of AF in cancer may be related to comorbidities of patients, cancer treatment, or a direct tumor effect. The objectives of this study were to investigate the incidence of AF according to cancer type.
Methods
From the Korean National Health Insurance Service elderly (NHIS-elderly) cohort (age >60), we identified 67,077 patients with newly diagnosed cancer and without previous AF. Incidence rates of new onset AF were evaluated.
Results
The mean age of the cancer patients was 75.1 year and 53.5% were males. During a median follow-up period of 25 months, the incidence rate of AF among overall cancer patients was higher than that of age-sex matched non-cancer population (1.42 vs. 0.69 per 100 person-years, respectively). Compared with solid cancer, the risk of incident AF in patients with hematologic cancer was significantly higher (hazard ratio [HR]: 1.53, 95% confidence interval [CI]: 1.39–1.72, p<0.001). Among patients with solid cancer, thoracic (lung cancer, esophageal cancer, mediastinal cancer, etc.) and breast cancer was associated with a higher risk of AF incidence compared with other solid cancer (HR: 1.64, 95% CI: 1.53–1.76, p<0.001).
Conclusions
Cancer was associated with an increased incidence of AF. Hematologic cancer was associated with higher risk of AF incidence than solid cancer. Among solid cancer, thoracic and breast cancer was most strongly associated with the risk of AF incidence.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- P.S Yang
- CHA University, Seongnam, Korea (Republic of)
| | - M Shim
- CHA University, Seongnam, Korea (Republic of)
| | - S.H Kang
- CHA University, Seongnam, Korea (Republic of)
| | - S.H Kim
- CHA University, Seongnam, Korea (Republic of)
| | - W.J Kim
- CHA University, Seongnam, Korea (Republic of)
| | - J.Y Moon
- CHA University, Seongnam, Korea (Republic of)
| | - J.H Sung
- CHA University, Seongnam, Korea (Republic of)
| | - I.J Kim
- CHA University, Seongnam, Korea (Republic of)
| | - S.W Lim
- CHA University, Seongnam, Korea (Republic of)
| | - D.H Cha
- CHA University, Seongnam, Korea (Republic of)
| | - G.Y.H Lip
- University of Liverpool, Liverpool, United Kingdom
| | - B Joung
- Yonsei University College of Medicine, Cardiology, Seoul, Korea (Republic of)
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Affiliation(s)
- S Y Kye
- Cancer Information and Education Branch, National Cancer Control Institute, National Cancer Center, Goyang-si, Republic of Korea
| | - M Shim
- Department of Communication and Information, Inha University, Incheon, Republic of Korea
| | - Y C Kim
- College of Communication, Yonsei University, Seoul, Republic of Korea
| | - K Park
- Cancer Policy Branch, National Cancer Control Institute, National Cancer Center, Goyang-si, Republic of Korea
- Department of Cancer Control and Policy, National Cancer Center, Graduate School of Cancer Science and Policy, Goyang-si, Republic of Korea
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Shim M, Chung H, Cho S, Yoshida H. Disproportionation Characteristics of a Zirconium-Cobalt Hydride Bed under ITER Operating Conditions. Fusion Science and Technology 2017. [DOI: 10.13182/fst08-26] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Shim
- Korea Atomic Energy Research Institute P.O. Box 305-353, 150 Deokjin-dong, Yuseong-gu, Daejeon, Korea
| | - H. Chung
- Korea Atomic Energy Research Institute P.O. Box 305-353, 150 Deokjin-dong, Yuseong-gu, Daejeon, Korea
| | - S. Cho
- Korea Atomic Energy Research Institute P.O. Box 305-353, 150 Deokjin-dong, Yuseong-gu, Daejeon, Korea
| | - H. Yoshida
- Korea Atomic Energy Research Institute P.O. Box 305-353, 150 Deokjin-dong, Yuseong-gu, Daejeon, Korea
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Heo EJ, Paik ES, Shim M, Kang H, Kim WY, Kim MK, Lee YY, Choi CH, Kim TJ, Lee JW, Kim BG, Bae DS. Mature Cystic Teratoma Is a Good Indication for LESS Approach: Initial Experience of an Internal Organ Retractor (IOR) Device or Barbed Suture for LESS Cystectomy. J Minim Invasive Gynecol 2016. [DOI: 10.1016/j.jmig.2016.08.673] [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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7
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Paik ES, Choi HJ, Shim M, Kang H, Kim WY, Kim MK, Lee YY, Choi CH, Kim TJ, Lee JW, Kim BG, Bae DS. Comparison of Surgical Outcomes of Laparoscopy and Laparotomy for Secondary Cytoreductive Surgery with Localized Single Recurrent Site Epithelial Ovarian Cancer. J Minim Invasive Gynecol 2016. [DOI: 10.1016/j.jmig.2016.08.751] [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: 11/24/2022]
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8
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Lee H, Cho YH, Sung K, Kim WS, Shim M, Park PW, Lee YT. 166 * ROOT REPLACEMENT IN ACUTE TYPE A DISSECTION: DOES VALVE SPARING OPERATION INCREASE SURGICAL RISK? Interact Cardiovasc Thorac Surg 2014. [DOI: 10.1093/icvts/ivu276.166] [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: 11/13/2022] Open
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9
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Aditya N, Shim M, Yang H, Lee Y, Ko S. Antiangiogenic effect of combined treatment with curcumin and genistein on human prostate cancer cell line. J Funct Foods 2014. [DOI: 10.1016/j.jff.2014.03.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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10
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Shim M, Bae JY, Lee YJ, Ahn MJ. Tectoridin from Maackia amurensis modulates both estrogen and thyroid receptors. Phytomedicine 2014; 21:602-606. [PMID: 24252334 DOI: 10.1016/j.phymed.2013.10.022] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 09/30/2013] [Accepted: 10/17/2013] [Indexed: 06/02/2023]
Abstract
AIM The stem bark of Maackia amurensis has been used as folk medicine for the treatment of cancer, cholecystitis, arthritis, and hyperthyroidism in females. In this study we examined the effects of the ethyl acetate fraction obtained from the 70% ethanol extract of M. amurensis and tectoridin, an active constituent isolated from the ethyl acetate fraction on thyroid and estrogen hormone activity. METHODS The effect of the ethanolic extract of M. amurensis stem bark on thyroid hormone activity was evaluated using thyroid hormone responsive-luciferase assay. We isolated tectoridin from the ethyl acetate fraction using a recrystallization method. T-screen assays were used to confirm thyroid hormone activity. The estrogenic activity of the ethyl acetate fraction of M. amurensis and tectoridin was evaluated by estrogen responsive-luciferase assay and estrogen receptor alpha regulation as compared to 17β-estradiol. RESULTS Both the ethyl acetate fraction and tectoridin activated thyroid-responsive reporters and increased thyroid hormone-dependent proliferation of rat pituitary GH3 cells, indicating modulation of thyroid hormone receptors. In parallel, the estrogenic activity of the fraction and tectoridin were characterized in a transient transfection system using estrogen-responsive luciferase plasmids in MCF-7 cells. The ethyl acetate fraction and tectoridin activated reporter gene expression and decreased the estrogen receptor protein level. CONCLUSIONS These data indicate that tectoridin acts as a weak phytoestrogen as well as a thyroid hormone-like agent by activating both estrogen and thyroid hormone receptors.
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Affiliation(s)
- Myeongkuk Shim
- College of Life Science, Institute of Biotechnology, Department of Bioscience and Biotechnology, Sejong University, Seoul 143-747, Republic of Korea
| | - Ji-Yeong Bae
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju 660-701, Republic of Korea
| | - Young Joo Lee
- College of Life Science, Institute of Biotechnology, Department of Bioscience and Biotechnology, Sejong University, Seoul 143-747, Republic of Korea.
| | - Mi-Jeong Ahn
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju 660-701, Republic of Korea.
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11
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Aditya NP, Shim M, Lee I, Lee Y, Im MH, Ko S. Curcumin and genistein coloaded nanostructured lipid carriers: in vitro digestion and antiprostate cancer activity. J Agric Food Chem 2013; 61:1878-83. [PMID: 23362941 DOI: 10.1021/jf305143k] [Citation(s) in RCA: 152] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
To increase the oral bioavailability of curcumin and genistein, we fabricated nanostructured lipid carriers (NLCs), and the impact of these carriers on bioaccessibility of curcumin and genistein was studied. Entrapment efficiency was more than 75% for curcumin and/or genistein-loaded NLCs. Solubility of curcumin and/or genistein in simulated intestinal medium (SIM) was >75% after encapsulating within NLCs which otherwise was <20%. Both curcumin and genistein have shown good stability (≥85%) in SIM and simulated gastric medium (SGM) up to 6 h. Coloading of curcumin and genistein had no adverse effect on solubility and stability of each molecule. Instead, coloading increased loading efficiency and the cell growth inhibition in prostate cancer cells. Collectively, these results have shown that coloaded lipid based carriers are promising vehicles for oral delivery of poorly bioaccessible molecules like curcumin and genistein.
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Affiliation(s)
- N P Aditya
- Department of Food Science and Technology, Sejong University, Seoul, Republic of Korea
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12
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Park J, Shim M, Rhyu MR, Lee Y. Estrogen receptor mediated effects of Cimicifuga extracts on human breast cancer cells. Pharmazie 2012; 67:947-950. [PMID: 23210246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Cimicifuga racemosa extracts have long been used to treat female reproductive disorders both in Asia and Europe. Here in this study, we examined the possible estrogen receptor (ER)alpha effects of Cimicifuga heracleifolia var. bifida ethanol extract (C-Ex), which has been used traditionally in Asia, in MCF-7 cells. The activity of C-Ex was characterized in a transient transfection system, using ERa and estrogen-responsive luciferase plasmids in HEK 293 cells and endogenous target genes were studied in MCF-7 cells. C-Ex failed to activate ERalpha and at a concentration of 0.005-0.5 mg/ml as examined by reporter activity. In addition, no statistically significant antiestrogenic activity was observed. However, to our interest, C-Ex enhanced expression of VEGF at 0.5 mg/ml concentration and repressed ERalpha both at the mRNA and protein levels in MCF-7 cells. These results suggested that C-Ex does not activate or inactivate ERalpha in a direct manner, but the extracts may affect factors in ER signal transduction pathway.
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Affiliation(s)
- Joonwoo Park
- College of Life Science, Institute of Biotechnology, Department of Bioscience and Biotechnology, Sejong University, Seoul, Korea
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13
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Shim M, Chung H, Kim K, Yoshida H, Cho S, Kim D, Ahn M. Heat analysis on the initial reference design of ZrCo hydride beds for ITER. Fusion Engineering and Design 2008. [DOI: 10.1016/j.fusengdes.2008.06.035] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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14
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Malathi K, Paranjape J, Bulanova E, Shim M, Guenther-Johnson J, Faber P, Eling T, Williams B, Silverman R. A Transcriptional Signaling Pathway in the IFN System Mediated by 2′-5′-Oligoadenylate Activation of RNase L. J Urol 2006. [DOI: 10.1016/s0022-5347(05)00626-9] [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: 10/25/2022]
Affiliation(s)
- K. Malathi
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio
| | - J.M. Paranjape
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio
| | - E. Bulanova
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio
| | - M. Shim
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio
| | - J.M. Guenther-Johnson
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio
| | - P.W. Faber
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio
| | - T.E. Eling
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio
| | - B.R. Williams
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio
| | - R.H. Silverman
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio
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15
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Chow T, Hayward J, Shim M. Po-Poster - 17: GE Lightspeed-RT WideView image reconstructions: Are they suitable for radiation therapy treatment planning? Med Phys 2005. [DOI: 10.1118/1.2030996] [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: 11/07/2022] Open
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16
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Chung I, Burkart A, Szmydynger-Chodobska J, Dodd KA, Trimble WS, Miller KV, Shim M, Chodobski A. Expression of two membrane fusion proteins, synaptosome-associated protein of 25 kDa and vesicle-associated membrane protein, in choroid plexus epithelium. Neuroscience 2003; 116:349-57. [PMID: 12559091 DOI: 10.1016/s0306-4522(02)00720-0] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In addition to being the major site of cerebrospinal fluid formation, the choroid plexus epithelium emerges as an important source of polypeptides in the brain. Physiologically regulated release of some polypeptides synthesized by the choroid plexus has been shown. The molecular mechanisms underlying this polypeptide secretion have not been characterized, however. In the present study, synaptosome-associated protein of 25 kDa and vesicle-associated membrane protein, two membrane fusion proteins playing a critical role in exocytosis in neurons and endocrine cells, were found to be expressed in the choroid plexus epithelium. It was also shown that in choroidal epithelium, synaptosome-associated protein of 25 kDa and vesicle-associated membrane protein stably interact. Two members of the vesicle-associated membrane protein family, vesicle-associated membrane protein-1 and vesicle-associated membrane protein-2, were expressed in the rat choroid plexus at the messenger RNA and protein level. However, their newly discovered isoforms, vesicle-associated membrane protein-1b and vesicle-associated membrane protein-2b, produced by alternative RNA splicing, were not detected in choroidal tissue. Immunohistochemistry demonstrated that vesicle-associated membrane protein is confined to the cytoplasm of choroidal epithelium, whereas synaptosome-associated protein of 25 kDa is associated with plasma membranes, albeit with a varied cellular distribution among species studied. Specifically, in the rat choroid plexus, synaptosome-associated protein of 25 kDa was localized to the basolateral membrane domain of choroidal epithelium and was expressed in small groups of cells. In comparison, in ovine and human choroidal tissues, apical staining for synaptosome-associated protein of 25 kDa was found in the majority of epithelial cells. These species-related differences in cellular synaptosome-associated protein of 25 kDa distribution suggested that the synaptosome-associated protein of 25 kDa homologue, synaptosome-associated protein of 23 kDa, is also expressed in the rat choroid plexus, which was confirmed by reverse-transcriptase polymerase chain reaction. Our findings suggest that synaptosome-associated protein of 25 kDa and vesicle-associated membrane protein are involved in secretion of polypeptides from the choroid plexus epithelium. The presence of synaptosome-associated protein of 25 kDa and its homologue as well as multiple isoforms of vesicle-associated membrane protein in choroidal epithelium may play a role in the apical versus basolateral targeting of secretory vesicles.
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Affiliation(s)
- I Chung
- Department of Clinical Neurosciences, Brown University School of Medicine, Aldrich Building, Room 403, 593 Eddy Street, Providence, RI 02903, USA
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Abstract
Wurtzite ZnO nanocrystals capped with trioctylphosphine oxide or alkylamines are synthesized and characterized. These ZnO nanocrystals can be made n-type either by electron transfer doping from reducing species in solution or by above band gap photoexcitation with a UV lamp. The n-type nanocrystals exhibit a strong intraband infrared absorption, an extensive bleach of the interband band-edge absorption, and a complete quenching of the photoluminescence.
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Affiliation(s)
- M Shim
- The James Franck Institute, University of Chicago, Chicago, Illinois 60637, USA
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18
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Affiliation(s)
- M Shim
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
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19
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Abstract
Incorporating nanocrystals into future electronic or optoelectronic devices will require a means of controlling charge-injection processes and an understanding of how the injected charges affect the properties of nanocrystals. We show that the optical properties of colloidal semiconductor nanocrystal quantum dots can be tuned by an electrochemical potential. The injection of electrons into the quantum-confined states of the nanocrystal leads to an electrochromic response, including a strong, size-tunable, midinfrared absorption corresponding to an intraband transition, a bleach of the visible interband exciton transitions, and a quench of the narrow band-edge photoluminescence.
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Affiliation(s)
- C Wang
- James Franck Institute, University of Chicago, Chicago, IL 60637, USA
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20
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Abstract
Colloidal semiconductor nanocrystals combine the physical and chemical properties of molecules with the optoelectronic properties of semiconductors. Their colour is highly controllable, a direct consequence of quantum confinement on the electronic states. Such nanocrystals are a form of 'artificial atoms' (ref. 4) that may find applications in optoelectronic systems such as light-emitting diodes and photovoltaic cells, or as components of future nanoelectronic devices. The ability to control the electron occupation (especially in n-type or p-type nanocrystals) is important for tailoring the electrical and optical properties, and should lead to a wider range of practical devices. But conventional doping by introducing impurity atoms has been unsuccessful so far: impurities tend to be expelled from the small crystalline cores (as observed for magnetic impurities), and thermal ionization of the impurities (which provides free carriers) is hindered by strong confinement. Here we report the fabrication of n-type nanocrystals using an electron transfer approach commonly employed in the field of conducting organic polymers. We find that semiconductor nanocrystals prepared as colloids can be made n-type, with electrons in quantum confined states.
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Affiliation(s)
- M Shim
- James Franck Institute, University of Chicago, Illinois 60637, USA.
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21
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Abstract
Perturbations of the insulin-like growth factor (IGF) axis, including the autocrine production of IGFs, IGF binding proteins (IGFBPs) and IGFBP proteases such as prostate specific antigen (PSA), and cathepsin D have been identified in prostate, lung and breast cancer cells and tissues. Serum IGFBP-3 levels have been found to be negatively correlated to the risk of cancer. Interestingly, IGFBP-3 is a potent inhibitor of IGF action and also mediates apoptosis via an IGF-independent mechanism. Recent case-control studies have found an approximately 10% increase in the serum levels of IGF-I in patients with prostate, breast and lung cancers, which are among the most frequently diagnosed cancers. While the studies indicate an association between serum IGF-I levels and cancer risk, causality has not been established. Thus, serum IGF-I level may actually be a confounding variable, serving as a marker for autocrine tissue IGF-I production. Growth hormone (GH) therapy raises both IGF-I and IGFBP-3 levels in serum. However, the role of GH in controlling prostate, breast and lung growth and carcinogenesis remains unclear from animal studies. Increased GH levels as seen in acromegaly have been associated with benign prostatic hyperplasia but not with prostate, breast or lung cancers, although colon cancer mortality may be increased. Should serum IGF-I levels be proven to play a causal role in the pathogenesis of cancer, interpreting the risk associated with therapies such as GH replacement must take into account both the duration of exposure and the risk magnitude associated with the degree of serum IGF-I elevation. Since GH-deficient patients often have a subnormal IGF-I serum level, which normalizes on therapy, their cancer risk on GH therapy probably does not increase substantially above that of the normal population. Until further research in the area dictates otherwise, ongoing surveillance and routine monitoring of IGF-I levels in GH recipients should become standard of care.
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Affiliation(s)
- M Shim
- Division of Pediatric Endocrinology, UCLA, Los Angeles, CA 90095-1752, USA
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Zhu S, Oh HS, Shim M, Sterneck E, Johnson PF, Smart RC. C/EBPbeta modulates the early events of keratinocyte differentiation involving growth arrest and keratin 1 and keratin 10 expression. Mol Cell Biol 1999; 19:7181-90. [PMID: 10490653 PMCID: PMC84711 DOI: 10.1128/mcb.19.10.7181] [Citation(s) in RCA: 125] [Impact Index Per Article: 5.0] [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: 11/20/2022] Open
Abstract
The epidermis is a stratified squamous epithelium composed primarily of keratinocytes that become postmitotic and undergo sequential changes in gene expression during terminal differentiation. The expression of the transcription factor CCAAT/enhancer binding protein beta (C/EBPbeta) within mouse epidermis and primary keratinocytes has recently been described; however, the function of C/EBPbeta within the epidermal keratinocyte is unknown. We report here that transient transfection of mouse primary keratinocytes with a C/EBP-responsive promoter-reporter construct resulted in a sevenfold increase in luciferase activity when keratinocytes were switched to culture conditions that induce growth arrest and differentiation. Forced expression of C/EBPbeta in BALB/MK2 keratinocytes inhibited growth, induced morphological changes consistent with a more differentiated phenotype, and upregulated two early markers of differentiation, keratin 1 (K1) and keratin 10 (K10) but had a minimal effect on the expression of late-stage markers, loricrin and involucrin. Analysis of the epidermis of C/EBPbeta-deficient mice revealed a mild epidermal hyperplasia and decreased expression of K1 and K10 but not of involucrin and loricrin. C/EBPbeta-deficient primary keratinocytes were partially resistant to calcium-induced growth arrest. Analysis of terminally differentiated spontaneously detached keratinocytes or those induced to differentiate by suspension culture revealed that C/EBPbeta-deficient keratinocytes displayed striking decreases in K1 and K10, while expression of later-stage markers was only minimally altered. Our results demonstrate that C/EBPbeta plays an important role in the early events of stratified squamous differentiation in keratinocytes involving growth arrest and K1 and K10 expression.
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Affiliation(s)
- S Zhu
- Molecular and Cellular Toxicology, Department of Toxicology, North Carolina State University, Raleigh, North Carolina 27695-7633, USA
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Abstract
Laparoscopic resection of the low rectum is technically difficult. This article describes a technique for laparoscopic-assisted, transvaginal low anterior resection of the rectum, which is technically easier and leads to an excellent cosmetic result.
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Affiliation(s)
- J Kim
- Department of General Surgery, Yeungnam University Hospital, Taegu, Korea
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Benn DK, Minden NJ, Pettigrew JC, Shim M. Centralized automated quality assurance for large scale health care systems. A pilot method for some aspects of dental radiography. Oral Surg Oral Med Oral Pathol 1994; 78:247-54. [PMID: 7936597 DOI: 10.1016/0030-4220(94)90155-4] [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: 01/27/2023]
Abstract
President Clinton's Health Security Act proposes the formation of large scale health plans with improved quality assurance. Dental radiography consumes 4% ($1.2 billion in 1990) of total dental expenditure yet regular systematic office quality assurance is not performed. A pilot automated method is described for assessing density of exposed film and fogging of unexposed processed film. A workstation and camera were used to input intraoral radiographs. Test images were produced from a phantom jaw with increasing exposure times. Two radiologists subjectively classified the images as too light, acceptable, or too dark. A computer program automatically classified global grey level histograms from the test images as too light, acceptable, or too dark. The program correctly classified 95% of 88 clinical films. Optical density of unexposed film in the range 0.15 to 0.52 measured by computer was reliable to better than 0.01. Further work is needed to see if comprehensive centralized automated radiographic quality assurance systems with feedback to dentists are feasible, are able to improve quality, and are significantly cheaper than conventional clerical methods.
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Affiliation(s)
- D K Benn
- Departments of Oral Diagnostic Sciences and Radiology, University of Florida Colleges of Dentistry and Medicine, Gainesville
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Shim M, Mensink N. A back care program for health care workers. Dimens Health Serv 1989; 66:24-5. [PMID: 2523327] [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: 01/01/2023]
Affiliation(s)
- M Shim
- Alberta Hospital, Edmonton
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