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Lee RH, Curtis J, Drake MT, Bobo Tanner S, Lenert L, Schmader K, Pieper C, North R, Lyles KW. Association of prior treatment with nitrogen-containing bisphosphonates on outcomes of COVID-19 positive patients. Osteoporos Int 2024; 35:181-187. [PMID: 37700010 DOI: 10.1007/s00198-023-06912-6] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 09/01/2023] [Indexed: 09/14/2023]
Abstract
COVID-19 infection has resulted in significant morbidity and mortality globally, especially among older adults. Repurposed drugs have demonstrated activity in respiratory illnesses, including nitrogen-containing bisphosphonates. In this retrospective longitudinal study at 4 academic medical centers, we show no benefit of nitrogen-containing bisphosphonates regarding ICU admission, ventilator use, and mortality among older adults with COVID-19 infection. We specifically evaluated the intravenous bisphosphonate zoledronic acid and found no difference compared to oral bisphosphonates. BACKGROUND Widely used in osteoporosis treatment, nitrogen-containing bisphosphonates (N-BP) have been associated with reduced mortality and morbidity among older adults. Based on prior studies, we hypothesized that prior treatment with N-BP might reduce intensive care unit (ICU) admission, ventilator use, and death among older adults diagnosed with COVID-19. METHODS This retrospective analysis of the PCORnet Common Data Model across 4 academic medical centers through 1 September 2021 identified individuals age >50 years with a diagnosis of COVID-19. The composite outcome included ICU admission, ventilator use, or death within 15, 30, and 180 days of COVID-19 diagnosis. Use of N-BP was defined as a prescription within 3 years prior. ICU admission and ventilator use were determined using administrative codes. Death included both in-hospital and out-of-hospital events. Patients treated with N-BP were matched 1:1 by propensity score to patients without prior N-BP use. Secondary analysis compared outcomes among those prescribed zoledronic acid (ZOL) to those prescribed oral N-BPs. RESULTS Of 76,223 COVID-19 patients identified, 1,853 were previously prescribed N-BP, among whom 559 were prescribed ZOL. After propensity score matching, there were no significant differences in the composite outcome at 15 days (HR 1.22, 95% CI: 0.89-1.67), 30 days (HR 1.24, 95% CI: 0.93-1.66), or 180 days (HR 1.17, 95% CI: 0.93-1.48), comparing those prescribed and not prescribed N-BP. Compared to those prescribed oral N-BP, there were no significant differences in outcomes among those prescribed ZOL. CONCLUSION Among older COVID-19 patients, prior exposure to N-BP including ZOL was not associated with a reduction in ICU admission, ventilator use, or death.
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Affiliation(s)
- R H Lee
- Duke University, Durham, NC, USA.
| | - J Curtis
- Duke University, Durham, NC, USA
| | | | | | - L Lenert
- Medical University of South Carolina, Charleston, SC, USA
| | | | - C Pieper
- Duke University, Durham, NC, USA
| | - R North
- Duke University, Durham, NC, USA
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Kim TM, Lee RH, Kim MS, Lewis CA, Park C. ETV2/ER71, the key factor leading the paths to vascular regeneration and angiogenic reprogramming. Stem Cell Res Ther 2023; 14:41. [PMID: 36927793 PMCID: PMC10019431 DOI: 10.1186/s13287-023-03267-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Accepted: 03/08/2023] [Indexed: 03/18/2023] Open
Abstract
Extensive efforts have been made to achieve vascular regeneration accompanying tissue repair for treating vascular dysfunction-associated diseases. Recent advancements in stem cell biology and cell reprogramming have opened unforeseen opportunities to promote angiogenesis in vivo and generate autologous endothelial cells (ECs) for clinical use. We have, for the first time, identified a unique endothelial-specific transcription factor, ETV2/ER71, and revealed its essential role in regulating endothelial cell generation and function, along with vascular regeneration and tissue repair. Furthermore, we and other groups have demonstrated its ability to directly reprogram terminally differentiated non-ECs into functional ECs, proposing ETV2/ER71 as an effective therapeutic target for vascular diseases. In this review, we discuss the up-to-date status of studies on ETV2/ER71, spanning from its molecular mechanism to vasculo-angiogenic role and direct cell reprogramming toward ECs. Furthermore, we discuss future directions to deploy the clinical potential of ETV2/ER71 as a novel and potent target for vascular disorders such as cardiovascular disease, neurovascular impairment and cancer.
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Affiliation(s)
- Tae Min Kim
- Graduate School of International Agricultural Technology and Institutes of Green-Bio Science and Technology, Seoul National University, 1447 Pyeongchang-daero, Pyeongchang, Gangwon-do, 25354, Republic of Korea.
| | - Ra Ham Lee
- Department of Molecular and Cellular Physiology, Louisiana State University Health Science Center, 1501 Kings Highway, Shreveport, LA, 71103, USA
| | - Min Seong Kim
- Department of Molecular and Cellular Physiology, Louisiana State University Health Science Center, 1501 Kings Highway, Shreveport, LA, 71103, USA
| | - Chloe A Lewis
- Department of Molecular and Cellular Physiology, Louisiana State University Health Science Center, 1501 Kings Highway, Shreveport, LA, 71103, USA
| | - Changwon Park
- Department of Molecular and Cellular Physiology, Louisiana State University Health Science Center, 1501 Kings Highway, Shreveport, LA, 71103, USA.
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Lee YS, Son S, Lee HK, Lee RH, Shin D. Elucidating breed-specific variants of native pigs in Korea: insights into pig breeds' genomic characteristics. Anim Cells Syst (Seoul) 2022; 26:338-347. [PMID: 36605594 PMCID: PMC9809348 DOI: 10.1080/19768354.2022.2141316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Although conserving native pig breeds is important in Korea, research on the genomic aspects to identify breed-specific variations in native pig breeds is uncommon. Single nucleotide polymorphisms (SNPs) can be a powerful source for identifying breed-specific variants. We used whole genome sequencing data, including Jeju Native Pig (JNP), Korean Native Pig (KNP), Korean Wild Boar (KWB), and other western commercial pig breeds to determine native pig breed-specific SNPs. Furthermore, the goal was not only to determine the genomic specificity of native pig breeds but also to identify SNPs that carry breed-specific information (breed-informative SNPs) that can be related to breed characteristics. The representative characteristics of native pigs are their unique meat quality and disease resistance. We surveyed the gene ontology (GO) of native pigs with breed-specific SNPs. Examining the genes associated with GO may contribute to revealing the reasons for the unique characteristics of native pig breeds. The enriched GOs terms were neuron projection development, cell surface receptor signaling pathway, ion homeostasis in JNP, cell adhesion and wound healing in KNP, and DNA repair and reproduction in KWB. We expect that this study of breed-specific SNPs will enable us to gain a deeper understanding of native pigs in Korea.
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Affiliation(s)
- Young-Sup Lee
- Department of Animal Biotechnology, Jeonbuk National University, Jeonju, Republic of Korea
| | - Seungwoo Son
- Department of Agricultural Convergence Technology, Jeonbuk National University, Jeonju, Republic of Korea
| | - Hak-Kyo Lee
- Department of Animal Biotechnology, Jeonbuk National University, Jeonju, Republic of Korea,Department of Agricultural Convergence Technology, Jeonbuk National University, Jeonju, Republic of Korea
| | - Ra Ham Lee
- Department of Animal Biotechnology, Jeonbuk National University, Jeonju, Republic of Korea, Ra Ham Lee Department of Animal Biotechnology, Jeonbuk National University, Jeonju54896, Republic of Korea; Donghyun Shin Department of Agricultural Convergence Technology, Jeonbuk National University, Jeonju54896, Republic of Korea
| | - Donghyun Shin
- Department of Agricultural Convergence Technology, Jeonbuk National University, Jeonju, Republic of Korea, Ra Ham Lee Department of Animal Biotechnology, Jeonbuk National University, Jeonju54896, Republic of Korea; Donghyun Shin Department of Agricultural Convergence Technology, Jeonbuk National University, Jeonju54896, Republic of Korea
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Colón-Emeric CS, Lee RH. Bisphosphonate holidays: using cost-effectiveness analysis for the "yes, but" questions. Osteoporos Int 2021; 32:2389-2390. [PMID: 34515817 DOI: 10.1007/s00198-021-06064-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 07/02/2021] [Indexed: 11/28/2022]
Affiliation(s)
- C S Colón-Emeric
- Duke University School of Medicine and the Durham VA Health System, Durham, NC, USA.
| | - R H Lee
- Duke University School of Medicine and the Durham VA Health System, Durham, NC, USA
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Lee RH, Oh JD, Hwang JS, Lee HK, Shin D. Antitumorigenic effect of insect-derived peptide poecilocorisin-1 in human skin cancer cells through regulation of Sp1 transcription factor. Sci Rep 2021; 11:18445. [PMID: 34531430 PMCID: PMC8446052 DOI: 10.1038/s41598-021-97581-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 04/14/2021] [Accepted: 08/18/2021] [Indexed: 12/28/2022] Open
Abstract
Malignant melanoma is highly resistant to conventional treatments and is one of the most aggressive types of skin cancers. Conventional cancer treatments are limited due to drug resistance, tumor selectivity, and solubility. Therefore, new treatments with fewer side effects and excellent effects should be developed. In previous studies, we have analyzed antimicrobial peptides (AMPs), which showed antibacterial and anti-inflammatory effects in insects, and some AMPs also exhibited anticancer efficacy. Anticancer peptides (ACPs) are known to have fewer side effects and high anticancer efficacy. In this study, the insect-derived peptide poecilocorisin-1 (PCC-1) did not induce toxicity in the human epithelial cell line HaCaT, but its potential as an anticancer agent was confirmed through specific effects of antiproliferation, apoptosis, and cell cycle arrest in two melanoma cell lines, SK-MEL-28 and G361. Additionally, we discovered a novel anticancer mechanism of insect-derived peptides in melanoma through the regulation of transcription factor Sp1 protein, which is overexpressed in cancer, apoptosis, and cell cycle-related proteins. Taken together, this study aims to clarify the anticancer efficacy and safety of insect-derived peptides and to present their potential as future therapeutic agents.
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Affiliation(s)
- Ra Ham Lee
- Department of Animal Biotechnology, Jeonbuk National University, Jeonju, 54896, Republic of Korea
| | - Jae-Don Oh
- Department of Animal Biotechnology, Jeonbuk National University, Jeonju, 54896, Republic of Korea
| | - Jae Sam Hwang
- Department of Agricultural Biology, National Institute of Agricultural Sciences, Rural Development Administration, Wanju, 55365, Republic of Korea
| | - Hak-Kyo Lee
- Department of Animal Biotechnology, Jeonbuk National University, Jeonju, 54896, Republic of Korea. .,The Animal Molecular Genetics and Breeding Center, Jeonbuk National University, Jeonju, 54896, Republic of Korea. .,Department of Agricultural Convergence Technology, Jeonbuk National University, Jeonju, 54896, Republic of Korea.
| | - Donghyun Shin
- The Animal Molecular Genetics and Breeding Center, Jeonbuk National University, Jeonju, 54896, Republic of Korea. .,Department of Agricultural Convergence Technology, Jeonbuk National University, Jeonju, 54896, Republic of Korea.
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Lee S, Lee JH, Lee RH, Shin YP, Kim IW, Seo M, Kim MA, Hwang JS, Shin D, Lee HK. De novo assembly and functional annotation of the Red-striped golden stink bug (Poecilocoris lewisi) transcriptome. Gene 2020; 767:145188. [PMID: 33002574 DOI: 10.1016/j.gene.2020.145188] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 08/25/2020] [Accepted: 09/23/2020] [Indexed: 12/11/2022]
Abstract
Insect antimicrobial peptides (AMPs) have a wide range of functions and potential applications, and have recently attracted attention as alternative foods and medicines for humans. Our study performed transcriptome analysis to explore the potential of the red-striped golden stink bug (Poecilocoris lewisi), and as a result, we have discovered new features of P. lewisi that have not been identified. Specifically, defensin found in P. lewisi is a well-known AMP and is expressed by various plants, animals and fungi for host defense. Moreover, the discovery of defensin in P. lewisi provides new research and important information. In this study, we identified AMP and related DEG in P. lewisi that are closely related to human disease and immune response. These findings will provide the basis and important information for future research on P. lewisi that has not yet been studied.
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Affiliation(s)
- Seokhyun Lee
- Department of Animal Biotechnology, College of Agricultural and Life Sciences, Chonbuk National University, Jeonju 54896, Republic of Korea.
| | - Joon Ha Lee
- Department of Animal Biotechnology, College of Agricultural and Life Sciences, Chonbuk National University, Jeonju 54896, Republic of Korea.
| | - Ra Ham Lee
- Department of Animal Biotechnology, College of Agricultural and Life Sciences, Chonbuk National University, Jeonju 54896, Republic of Korea.
| | - Yong Pyo Shin
- Department of Agricultural Biology, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea.
| | - In-Woo Kim
- Department of Agricultural Biology, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea.
| | - Minchul Seo
- Department of Agricultural Biology, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea.
| | - Mi-Ae Kim
- Department of Agricultural Biology, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea.
| | - Jae Sam Hwang
- Department of Agricultural Biology, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Republic of Korea.
| | - Donghyun Shin
- Department of Animal Biotechnology, College of Agricultural and Life Sciences, Chonbuk National University, Jeonju 54896, Republic of Korea; Department of Agricultural Convergence Technology, Jeonbuk National University, Jeonju 54896, Republic of Korea.
| | - Hak-Kyo Lee
- Department of Animal Biotechnology, College of Agricultural and Life Sciences, Chonbuk National University, Jeonju 54896, Republic of Korea; Department of Agricultural Convergence Technology, Jeonbuk National University, Jeonju 54896, Republic of Korea.
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Lee S, Lee RH, Kim SJ, Lee HK, Na CS, Song KD. Transcriptional regulation of chicken leukocyte cell-derived chemotaxin 2 in response to toll-like receptor 3 stimulation. Asian-Australas J Anim Sci 2019; 32:1942-1949. [PMID: 31480179 PMCID: PMC6819688 DOI: 10.5713/ajas.19.0192] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Accepted: 06/20/2019] [Indexed: 02/08/2023]
Abstract
Objective Leukocyte cell-derived chemotaxin 2 (LECT2) is associated with several physiological processes including inflammation, tumorigenesis, and natural killer T cell generation. Chicken LECT2 (chLECT2) gene was originally identified as one of the differentially expressed genes in chicken kidney tissue, where the chickens were fed with different calcium doses. In this study, the molecular characteristics and gene expression of chLECT2 were analyzed under the stimulation of toll-like receptor 3 (TLR3) ligand to understand the involvement of chLECT2 expression in chicken metabolic disorders. Methods Amino acid sequence of LECT2 proteins from various species including fowl, fish, and mammal were retrieved from the Ensembl database and subjected to Insilco analyses. In addition, the time- and dose-dependent expression of chLECT2 was examined in DF-1 cells which were stimulated with polyinosinic:polycytidylic acid (poly [I:C]), a TLR3 ligand. Further, to explore the transcription factors required for the transcription of chLECT2, DF-1 cells were treated with poly (I:C) in the presence or absence of the nuclear factor κB (NFκB) and activated protein 1 (AP-1) inhibitors. Results The amino acid sequence prediction of chLECT2 protein revealed that along with duck LECT2 (duLECT2), it has unique signal peptide different from other vertebrate orthologs, and only chLECT2 and duLECT2 have an additional 157 and 161 amino acids on their carboxyl terminus, respectively. Phylogenetic analysis suggested that chLECT2 is evolved from a common ancestor along with the actinopterygii hence, more closely related than to the mammals. Our quantitative polymerase chain reaction results showed that, the expression of chLECT2 was up-regulated significantly in DF-1 cells under the stimulation of poly (I:C) (p<0.05). However, in the presence of NFκB or AP-1 inhibitors, the expression of chLECT2 is suppressed suggesting that both NFκB and AP-1 transcription factors are required for the induction of chLECT2 expression. Conclusion The present results suggest that chLECT2 gene might be a target gene of TLR3 signaling. For the future, the expression pattern or molecular mechanism of chLECT2 under stimulation of other innate immune receptors shall be studied. The protein function of chLECT2 will be more clearly understood if further investigation about the mechanism of LECT2 in TLR pathways is conducted.
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Affiliation(s)
- Seokhyun Lee
- Department of Animal Biotechnology, College of Agricultural and Life Sciences, Jeonbuk National University, Jeonju 54896, Korea
| | - Ra Ham Lee
- Department of Animal Biotechnology, College of Agricultural and Life Sciences, Jeonbuk National University, Jeonju 54896, Korea
| | - Sung-Jo Kim
- Department of Biotechnology, Hoseo University, Asan 31499, Korea
| | - Hak-Kyo Lee
- Department of Animal Biotechnology, College of Agricultural and Life Sciences, Jeonbuk National University, Jeonju 54896, Korea
| | - Chong-Sam Na
- Department of Animal Biotechnology, College of Agricultural and Life Sciences, Jeonbuk National University, Jeonju 54896, Korea
| | - Ki-Duk Song
- Department of Animal Biotechnology, College of Agricultural and Life Sciences, Jeonbuk National University, Jeonju 54896, Korea.,The Animal Molecular Genetics and Breeding Center, Jeonbuk National University, Jeonju 54896, Korea
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8
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Lee RH, Lee S, Kim YR, Kim SJ, Lee HK, Song KD. Molecular characterization and expression of a disintegrin and metalloproteinase with thrombospondin motifs 8 in chicken. Asian-Australas J Anim Sci 2018; 31:1366-1372. [PMID: 29879819 PMCID: PMC6043438 DOI: 10.5713/ajas.18.0265] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 05/23/2018] [Indexed: 11/27/2022]
Abstract
Objective A disintegrin and metallopeptidase with thrombospondin motifs type 8 (ADAMTS8) is crucial for diverse physiological processes, such as inflammation, tissue morphogenesis, and tumorigenesis. The chicken ADAMTS8 (chADAMTS8) gene was differentially expressed in the kidney following exposure to different calcium concentrations, suggesting a pathological role of this protein in metabolic diseases. We aimed to examine the molecular characteristics of chADAMTS8 and analyze the gene-expression differences in response to toll-like receptor 3 (TLR3) stimulation. METHODS The ADAMTS8 mRNA and amino acid sequences of various species (chicken, duck, cow, mouse, rat, human, chimpanzee, pig, and horse) were retrieved from the Ensembl database and subjected to bioinformatics analyses. Reverse-transcription polymerase chain reaction (RT-PCR) and quantitative PCR (qPCR) experiments were performed with various chicken tissues and the chicken fibroblast DF-1 cell line, which was stimulated with polyinosinic-polycytidylic acid (poly[I:C]; a TLR3 ligand). RESULTS The chADAMTS8 gene was predicted to contain three thrombospondin type 1 (TSP1) domains, whose amino acid sequences shared homology among the different species, whereas sequences outside the TSP1 domains (especially the amino-terminal region) were very difffferent. Phylogenetic analysis revealed that chADAMTS8 is evolutionarily clustered in the same clade with that of the duck. chADAMTS8 mRNA was broadly expressed in chicken tissues, and the expression was significantly up-regulated in the DF-1 cells in response to poly(I:C) stimulation (p<0.05). These results showed that chADAMTS8 may be a target gene for TLR3 signaling. CONCLUSION In this report, the genetic information of chADAMTS8 gene, its expression in chicken tissues, and chicken DF-1 cells under the stimulation of TLR3 were shown. The result suggests that chADAMTS8 expression may be induced by viral infection and correlated with TLR3-mediated signaling pathway. Further study of the function of chADAMTS8 during TLR3-dependent inflammation (which represents RNA viral infection) is needed and it will also be important to examine the molecular mechanisms during different regulation, depending on innate immune receptor activation.
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Affiliation(s)
- Ra Ham Lee
- Department of Animal Biotechnology, College of Agricultural and Life Sciences, Chonbuk National University, Jeonju 54896, Korea
| | - Seokhyun Lee
- Department of Animal Biotechnology, College of Agricultural and Life Sciences, Chonbuk National University, Jeonju 54896, Korea
| | - Yu Ra Kim
- Department of Animal Biotechnology, College of Agricultural and Life Sciences, Chonbuk National University, Jeonju 54896, Korea
| | - Sung-Jo Kim
- Division of Cosmetics and Biotechnology, Hoseo University, Asan 31499, Korea
| | - Hak-Kyo Lee
- Department of Animal Biotechnology, College of Agricultural and Life Sciences, Chonbuk National University, Jeonju 54896, Korea.,The Animal Molecular Genetics and Breeding Center, Chonbuk National University, Jeonju 54896, Korea
| | - Ki-Duk Song
- Department of Animal Biotechnology, College of Agricultural and Life Sciences, Chonbuk National University, Jeonju 54896, Korea.,The Animal Molecular Genetics and Breeding Center, Chonbuk National University, Jeonju 54896, Korea
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Ullah M, Kuroda Y, Bartosh TJ, Liu F, Zhao Q, Gregory C, Reger R, Xu J, Lee RH, Prockop DJ. Erratum: iPS-derived MSCs from an expandable bank to deliver a prodrug-converting enzyme that limits growth and metastases of human breast cancers. Cell Death Discov 2017; 3:17029. [PMID: 28845293 PMCID: PMC5563522 DOI: 10.1038/cddiscovery.2017.29] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
[This corrects the article DOI: 10.1038/cddiscovery.2016.64.].
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Han D, Cho JH, Lee RH, Bang W, Park K, Kim MS, Shim JH, Chae JI, Moon SY. Antitumorigenic effect of atmospheric-pressure dielectric barrier discharge on human colorectal cancer cells via regulation of Sp1 transcription factor. Sci Rep 2017; 7:43081. [PMID: 28225083 PMCID: PMC5320527 DOI: 10.1038/srep43081] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [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: 05/14/2016] [Accepted: 01/19/2017] [Indexed: 02/03/2023] Open
Abstract
Human colorectal cancer cell lines (HT29 and HCT116) were exposed to dielectric barrier discharge (DBD) plasma at atmospheric pressure to investigate the anticancer capacity of the plasma. The dose- and time-dependent effects of DBDP on cell viability, regulation of transcription factor Sp1, cell-cycle analysis, and colony formation were investigated by means of MTS assay, DAPI staining, propidium iodide staining, annexin V-FITC staining, Western blot analysis, RT-PCR analysis, fluorescence microscopy, and anchorage-independent cell transformation assay. By increasing the duration of plasma dose times, significant reductions in the levels of both Sp1 protein and Sp1 mRNA were observed in both cell lines. Also, expression of negative regulators related to the cell cycle (such as p53, p21, and p27) was increased and of the positive regulator cyclin D1 was decreased, indicating that the plasma treatment led to apoptosis and cell-cycle arrest. In addition, the sizes and quantities of colony formation were significantly suppressed even though two cancer promoters, such as TPA and epidermal growth factor, accompanied the plasma treatment. Thus, plasma treatment inhibited cell viability and colony formation by suppressing Sp1, which induced apoptosis and cell-cycle arrest in these two human colorectal cancer cell lines.
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Affiliation(s)
- Duksun Han
- Department of Applied Plasma Engineering, Chonbuk National University, 567 Baekje-daero, Jeonju, Jeollabuk-do, Republic of Korea
| | - Jin Hyoung Cho
- Department of Dental Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK 21 Plus, Chonbuk National University, 567 Baekje-daero, Jeonju, Jeollabuk-do, Republic of Korea
| | - Ra Ham Lee
- Department of Dental Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK 21 Plus, Chonbuk National University, 567 Baekje-daero, Jeonju, Jeollabuk-do, Republic of Korea
| | - Woong Bang
- Department of Dental Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK 21 Plus, Chonbuk National University, 567 Baekje-daero, Jeonju, Jeollabuk-do, Republic of Korea
| | - Kyungho Park
- Department of Dental Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK 21 Plus, Chonbuk National University, 567 Baekje-daero, Jeonju, Jeollabuk-do, Republic of Korea
| | - Minseok S. Kim
- Department of New Biology, DGIST, Daegu 42988, Republic of Korea
| | - Jung-Hyun Shim
- Department of Pharmacy, College of Pharmacy and Natural Medicine Research Institute, Mokpo National University, 1666 Yeongsan-ro, Muan-gun, Jeonnam, Republic of Korea
| | - Jung-Il Chae
- Department of Dental Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK 21 Plus, Chonbuk National University, 567 Baekje-daero, Jeonju, Jeollabuk-do, Republic of Korea
| | - Se Youn Moon
- Department of Applied Plasma Engineering, Chonbuk National University, 567 Baekje-daero, Jeonju, Jeollabuk-do, Republic of Korea
- Department of Quantum System Engineering, Chonbuk National University, 567 Baekje-daero, Jeonju, Jeollabuk-do, Republic of Korea
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Donnelly JE, Ptomey LT, Goetz JR, Sullivan DK, Gibson CA, Greene JL, Lee RH, Mayo MS, Honas JJ, Washburn RA. Weight management for adolescents with intellectual and developmental disabilities: Rationale and design for an 18month randomized trial. Contemp Clin Trials 2016; 51:88-95. [PMID: 27810602 DOI: 10.1016/j.cct.2016.10.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Revised: 10/24/2016] [Accepted: 10/29/2016] [Indexed: 11/29/2022]
Abstract
Adolescents with intellectual and developmental disabilities (IDD) are an underserved group in need of weight management. However, information regarding effective weight management for this group is limited, and is based primarily on results from small, non-powered, non-randomized trials that were not conducted in accordance with current weight management guidelines. Additionally, the comparative effectiveness of emerging dietary approaches, such as portion-controlled meals (PCMs) or program delivery strategies such as video chat using tablet computers have not been evaluated. Therefore, we will conduct an 18month trial to compare weight loss (6months) and maintenance (7-18months) in 123 overweight/obese adolescents with mild to moderate IDD, and a parent, randomized to a weight management intervention delivered remotely using FaceTime™ on an iPad using either a conventional meal plan diet (RD/CD) or a Stop Light diet enhanced with PCMs (RD/eSLD), or conventional diet delivered during face-to-face home visits (FTF/CD). This design will provide an adequately powered comparison of both diet (CD vs. eSLD) and delivery strategy (FTF vs. RD). Exploratory analyses will examine the influence of behavioral session attendance, compliance with recommendations for diet (energy intake), physical activity (min/day), self-monitoring of diet and physical activity, medications, and parental variables including diet quality, physical activity, baseline weight, weight change, and beliefs and attitudes regarding diet and physical activity on both weight loss and maintenance. We will also complete a cost and contingent valuation analysis to compare costs between RD and FTF delivery.
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Affiliation(s)
- J E Donnelly
- Cardiovascular Research Institute, Department of Internal Medicine, The University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA.
| | - L T Ptomey
- Cardiovascular Research Institute, Department of Internal Medicine, The University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA.
| | - J R Goetz
- Department of Dietetics and Nutrition, The University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA.
| | - D K Sullivan
- Department of Dietetics and Nutrition, The University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA.
| | - C A Gibson
- Department of Internal Medicine, The University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA.
| | - J L Greene
- Department of Health, Sport, and Exercise Sciences, University of Kansas, Lawrence, KS 66045, USA.
| | - R H Lee
- Department of Health Policy and Management, The University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA.
| | - M S Mayo
- Department of Biostatistics, The University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA.
| | - J J Honas
- Cardiovascular Research Institute, Department of Internal Medicine, The University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA.
| | - R A Washburn
- Cardiovascular Research Institute, Department of Internal Medicine, The University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA.
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12
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Cho JH, Lee RH, Jeon YJ, Park SM, Shin JC, Kim SH, Jeong JY, Kang HS, Choi NJ, Seo KS, Cho YS, Kim MS, Ko S, Seo JM, Lee SY, Shim JH, Chae JI. Proteomic Assessment of the Relevant Factors Affecting Pork Meat Quality Associated with Longissimus dorsi Muscles in Duroc Pigs. Asian-Australas J Anim Sci 2016; 29:1653-1663. [PMID: 27165031 PMCID: PMC5088387 DOI: 10.5713/ajas.16.0050] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 02/21/2016] [Accepted: 03/29/2016] [Indexed: 11/27/2022]
Abstract
Meat quality is a complex trait influenced by many factors, including genetics, nutrition, feeding environment, animal handling, and their interactions. To elucidate relevant factors affecting pork quality associated with oxidative stress and muscle development, we analyzed protein expression in high quality longissimus dorsi muscles (HQLD) and low quality longissimus dorsi muscles (LQLD) from Duroc pigs by liquid chromatographytandem mass spectrometry (LC-MS/MS)-based proteomic analysis. Between HQLD (n = 20) and LQLD (n = 20) Duroc pigs, 24 differentially expressed proteins were identified by LC-MS/MS. A total of 10 and 14 proteins were highly expressed in HQLD and LQLD, respectively. The 24 proteins have putative functions in the following seven categories: catalytic activity (31%), ATPase activity (19%), oxidoreductase activity (13%), cytoskeletal protein binding (13%), actin binding (12%), calcium ion binding (6%), and structural constituent of muscle (6%). Silver-stained image analysis revealed significant differential expression of lactate dehydrogenase A (LDHA) between HQLD and LQLD Duroc pigs. LDHA was subjected to in vitro study of myogenesis under oxidative stress conditions and LDH activity assay to verification its role in oxidative stress. No significant difference of mRNA expression level of LDHA was found between normal and oxidative stress condition. However, LDH activity was significantly higher under oxidative stress condition than at normal condition using in vitro model of myogenesis. The highly expressed LDHA was positively correlated with LQLD. Moreover, LDHA activity increased by oxidative stress was reduced by antioxidant resveratrol. This paper emphasizes the importance of differential expression patterns of proteins and their interaction for the development of meat quality traits. Our proteome data provides valuable information on important factors which might aid in the regulation of muscle development and the improvement of meat quality in longissimus dorsi muscles of Duroc pigs under oxidative stress conditions.
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Affiliation(s)
- Jin Hyoung Cho
- Department of Dental Pharmacology, School of Dentistry and Institute of Dental Bioscience, BK21 plus, Chonbuk National University, Jeonju 651-756, Korea
| | - Ra Ham Lee
- Department of Dental Pharmacology, School of Dentistry and Institute of Dental Bioscience, BK21 plus, Chonbuk National University, Jeonju 651-756, Korea
| | - Young-Joo Jeon
- Department of Dental Pharmacology, School of Dentistry and Institute of Dental Bioscience, BK21 plus, Chonbuk National University, Jeonju 651-756, Korea.,National Marine Biodiversity Institute of Korea, Seocheon 33662, Korea
| | - Seon-Min Park
- Pohang Center for Evaluation of Biomaterials, Pohang 37668, Korea
| | - Jae-Cheon Shin
- Pohang Center for Evaluation of Biomaterials, Pohang 37668, Korea
| | - Seok-Ho Kim
- Aging Research Institute, Korea Research Institute of Bioscience & BioTechnology, Daejeon 34141, Korea
| | - Jin Young Jeong
- Division of Animal Genomics and Bioinformatics, National Institute of Animal science, Rural Development Administration, Suwon, 441-706, Korea
| | - Hyun-Sung Kang
- Department of Animal Science and Technology, Sunchon National University, Suncheon 540-742, Korea
| | - Nag-Jin Choi
- Department of Animal Science, College of Agricultural and Life Science, Chonbuk National University, Jeonju 651-756, Korea
| | - Kang Seok Seo
- Department of Animal Science and Technology, Sunchon National University, Suncheon 540-742, Korea
| | - Young Sik Cho
- Department of Pharmacy, Keimyung University, Daegu 704-701, Korea
| | - MinSeok S Kim
- Department of Biomedical Engineering, Konyang University, Daejeon 35365, Korea
| | - Sungho Ko
- Department of Applied Bioscience, CHA University, Seongnam 463-836, Korea
| | - Jae-Min Seo
- Department of Prosthodontics, School of Dentistry and Institute of Oral Bio-Science and Research Institute of Clinical Medicine, Chonbuk National University, Jeonju 561-756, Korea
| | - Seung-Youp Lee
- Cluster for Craniofacial Development and Regeneration Research, Institute of Oral Biosciences and School of Dentistry, Chonbuk National University, Jeonju 561-756, Korea
| | - Jung-Hyun Shim
- Department of Pharmacy, College of Pharmacy and Natural Medicine Research Institute, Mokpo National University, Mokpo 534-729, Korea.,The China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan 127, China
| | - Jung-Il Chae
- Department of Dental Pharmacology, School of Dentistry and Institute of Dental Bioscience, BK21 plus, Chonbuk National University, Jeonju 651-756, Korea
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13
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Jeon YJ, Bang W, Cho JH, Lee RH, Kim SH, Kim MS, Park SM, Shin JC, Chung HJ, Oh KB, Seo JM, Ko S, Shim JH, Chae JI. Kahweol induces apoptosis by suppressing BTF3 expression through the ERK signaling pathway in non-small cell lung cancer cells. Int J Oncol 2016; 49:2294-2302. [DOI: 10.3892/ijo.2016.3727] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 08/04/2016] [Indexed: 11/06/2022] Open
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14
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Cho JH, Jeong JY, Lee RH, Park MN, Kim SH, Park SM, Shin JC, Jeon YJ, Shim JH, Choi NJ, Seo KS, Cho YS, Kim MS, Ko S, Seo JM, Lee SY, Chae JI, Lee HJ. Regional Differences of Proteins Expressing in Adipose Depots Isolated from Cows, Steers and Bulls as Identified by a Proteomic Approach. Asian-Australas J Anim Sci 2016; 29:1197-206. [PMID: 27165017 PMCID: PMC4932575 DOI: 10.5713/ajas.16.0051] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 02/21/2016] [Accepted: 04/18/2016] [Indexed: 11/27/2022]
Abstract
Adipose tissue in the loin muscle area of beef cattle as a marbling factor is directly associated with beef quality. To elucidate whether properties of proteins involved in depot specific adipose tissue were sex-dependent, we analyzed protein expression of intramuscular adipose tissue (IMAT) and omental adipose tissue (OMAT) from Hanwoo cows, steers, and bulls of Korean native beef cattle by liquid chromatography-tandem mass spectrometry (LC-MS/MS)-based proteomic analysis, quantitative polymerase chain reaction (PCR) and western blot analysis. Two different adipose depots (i.e. intramuscular and omental) were collected from cows (n = 7), steers (n = 7), or bulls (n = 7). LC-MS/MS revealed a total of 55 and 35 proteins in IMAT and OMAT, respectively. Of the 55 proteins identified, 44, 40, and 42 proteins were confirmed to be differentially expressed in IMAT of cows, steers, and bulls, respectively. In OMAT of cows, steers, and bulls, 33, 33, and 22 were confirmed to be differentially expressed, respectively. Tropomyosin (TPM) 1, TPM 2, and TPM3 were subjected to verification by quantitative PCR and western blot analysis in IMAT and OMAT of Hanwoo cows, steers, and bulls as key factors closely associated with muscle development. Both mRNA levels and protein levels of TPM1, TPM2, and TPM3 in IMAT were lower in bulls compared to in cows or steers suggesting that they were positively correlated with marbling score and quality grade. Our results may aid the regulation of marbling development and improvement of meat quality grades in beef cattle.
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Affiliation(s)
- Jin Hyoung Cho
- Department of Dental Pharmacology, School of Dentistry and Institute of Dental Bioscience, BK21 plus, Chonbuk National University, Jeonju 651-756, Korea
| | - Jin Young Jeong
- Animal Products Utilization Division, National Institute of Animal science, Jeonju 565-851, Korea
| | - Ra Ham Lee
- Department of Dental Pharmacology, School of Dentistry and Institute of Dental Bioscience, BK21 plus, Chonbuk National University, Jeonju 651-756, Korea
| | - Mi Na Park
- Animal Products Utilization Division, National Institute of Animal science, Jeonju 565-851, Korea
| | - Seok-Ho Kim
- Aging Research Institute, Korea Research Institute of Bioscience & BioTechnology, Daejeon 34141, Korea
| | - Seon-Min Park
- Pohang Center for Evaluation of Biomaterials, Pohang Technopark, Pohang 37668, Korea
| | - Jae-Cheon Shin
- Department of Pharmacy, College of Pharmacy and Natural Medicine Research Institute, Mokpo National University, Mokpo 534-729, Korea
| | - Young-Joo Jeon
- Department of Dental Pharmacology, School of Dentistry and Institute of Dental Bioscience, BK21 plus, Chonbuk National University, Jeonju 651-756, Korea
| | - Jung-Hyun Shim
- Department of Pharmacy, College of Pharmacy and Natural Medicine Research Institute, Mokpo National University, Mokpo 534-729, Korea
| | - Nag-Jin Choi
- Department of Animal Science, College of Agricultural and Life Science, Chonbuk National University, Jeonju 54896, Korea
| | - Kang Seok Seo
- Department of Animal Science and Technology, Sunchon National University, Suncheon 57922, Korea
| | - Young Sik Cho
- Department of Pharmacy, Keimyung University, Daegu 704-701, Korea
| | - MinSeok S Kim
- Department of Biomedical Engineering, Konyang University, Daejeon 35365, Korea
| | - Sungho Ko
- Department of Applied Bioscience, CHA University, Seongnam 463-836, Korea
| | - Jae-Min Seo
- Department of Prosthodontics, School of Dentistry and Institute of Oral Bio-Science and Research Institute of Clinical Medicine, Chonbuk National University, Jeonju 561-756, Korea
| | - Seung-Youp Lee
- Cluster for Craniofacial Development and Regeneration Research, Institute of Oral Biosciences and School of Dentistry, Chonbuk National University, Jeonju 561-756, Korea
| | - Jung-Il Chae
- Department of Dental Pharmacology, School of Dentistry and Institute of Dental Bioscience, BK21 plus, Chonbuk National University, Jeonju 651-756, Korea
| | - Hyun-Jeong Lee
- Animal Nutritional Physiology Team, National Institute of Animal Science, Jeonju 565-851, Korea
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Lee RH, Bergmeier W. Platelet immunoreceptor tyrosine-based activation motif (ITAM) and hemITAM signaling and vascular integrity in inflammation and development. J Thromb Haemost 2016; 14:645-54. [PMID: 26749528 DOI: 10.1111/jth.13250] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [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: 09/24/2015] [Accepted: 12/24/2015] [Indexed: 01/13/2023]
Abstract
Platelets are essential for maintaining hemostasis following mechanical injury to the vasculature. Besides this established function, novel roles of platelets are becoming increasingly recognized, which are critical in non-injury settings to maintain vascular barrier integrity. For example, during embryogenesis platelets act to support the proper separation of blood and lymphatic vessels. This role continues beyond birth, where platelets prevent leakage of blood into the lymphatic vessel network. During the course of inflammation, platelets are necessary to prevent local hemorrhage due to neutrophil diapedesis and disruption of endothelial cell-cell junctions. Surprisingly, platelets also work to secure tumor-associated blood vessels, inhibiting excessive vessel permeability and intra-tumor hemorrhaging. Interestingly, many of these novel platelet functions depend on immunoreceptor tyrosine-based activation motif (ITAM) signaling but not on signaling via G protein-coupled receptors, which plays a crucial role in platelet plug formation at sites of mechanical injury. Murine platelets express two ITAM-containing receptors: the Fc receptor γ-chain (FcRγ), which functionally associates with the collagen receptor GPVI, and the C-type lectin-like 2 (CLEC-2) receptor, a hemITAM receptor for the mucin-type glycoprotein podoplanin. Human platelets express an additional ITAM receptor, FcγRIIA. These receptors share common downstream effectors, including Syk, SLP-76 and PLCγ2. Here we will review the recent literature that highlights a critical role for platelet GPVI/FcRγ and CLEC-2 in vascular integrity during development and inflammation in mice and discuss the relevance to human disease.
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Affiliation(s)
- R H Lee
- McAllister Heart Institute, University of North Carolina, Chapel Hill, NC, USA
| | - W Bergmeier
- McAllister Heart Institute, University of North Carolina, Chapel Hill, NC, USA
- Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, NC, USA
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16
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Bang W, Jeon YJ, Cho JH, Lee RH, Park SM, Shin JC, Choi NJ, Choi YH, Cho JJ, Seo JM, Lee SY, Shim JH, Chae JI. β-lapachone suppresses the proliferation of human malignant melanoma cells by targeting specificity protein 1. Oncol Rep 2016; 35:1109-16. [PMID: 26718788 DOI: 10.3892/or.2015.4439] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 10/06/2015] [Indexed: 11/06/2022] Open
Abstract
β-lapachone (β-lap), a novel natural quinone derived from the bark of the Pink trumpet tree (Tabebuia avellanedae) has been demonstrated to have anticancer activity. In this study, we investigated whether β-lap exhibits anti-proliferative effects on two human malignant melanoma (HMM) cell lines, G361 and SK-MEL-28. The effects of β-lap on the HMM cell lines were investigated using 3-(4,5-dimethylthiazol-2-yl)‑5-(3-carboxymethoxyphenyl)‑2-(4-sulfophenyl-2H-tetrazolium (MTS) assay, 4',6-diamidino-2-phenylindole (DAPI) staining, Annexin V and Dead cell assay, mitochondrial membrane potential (MMP) assay and western blot analysis. We demonstrated that β-lap significantly induced apoptosis and suppressed cell viability in the HMM cells. Intriguingly, the transcription factor specificity protein 1 (Sp1) was significantly downregulated by β-lap in a dose- and time-dependent manner. Furthermore, β-lap modulated the protein expression level of the Sp1 regulatory genes including cell cycle regulatory proteins and apoptosis-associated proteins. Taken together, our findings indicated that β-lap modulates Sp1 transactivation and induces apoptotic cell death through the regulation of cell cycle- and apoptosis-associated proteins. Thus, β-lap may be used as a promising anticancer drug for cancer prevention and may improve the clinical outcome of patients with cancer.
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Affiliation(s)
- Woong Bang
- Department of Dental Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK21 Plus, Chonbuk National University, Jeonju 561-756, Republic of Korea
| | - Young-Joo Jeon
- Department of Dental Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK21 Plus, Chonbuk National University, Jeonju 561-756, Republic of Korea
| | - Jin Hyoung Cho
- Department of Dental Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK21 Plus, Chonbuk National University, Jeonju 561-756, Republic of Korea
| | - Ra Ham Lee
- Department of Dental Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK21 Plus, Chonbuk National University, Jeonju 561-756, Republic of Korea
| | - Seon-Min Park
- Pohang Center for Evaluation of Biomaterials, Pohang, Gyeongbuk 790‑834, Republic of Korea
| | - Jae-Cheon Shin
- Pohang Center for Evaluation of Biomaterials, Pohang, Gyeongbuk 790‑834, Republic of Korea
| | - Nag-Jin Choi
- Department of Animal Science, College of Agricultural and Life Science, Chonbuk National University, Jeonju 561‑756, Republic of Korea
| | - Yung Hyun Choi
- Department of Biochemistry, Dongeui University College of Oriental Medicine, Busan 614-052, Republic of Korea
| | - Jung-Jae Cho
- Department of Pharmacy, College of Pharmacy and Natural Medicine Research Institute, Mokpo National University, Jeonnam 534-729, Republic of Korea
| | - Jae-Min Seo
- Department of Prosthodontics, School of Dentistry and Institute of Oral Bio-Science and Research Institute of Clinical Medicine, Chonbuk National University, Jeonju 561-756, Republic of Korea
| | - Seung-Yeop Lee
- Cluster for Craniofacial Development and Regeneration Research, Institute of Oral Biosciences and School of Dentistry, Chonbuk National University, Jeonju 561-756, Republic of Korea
| | - Jung-Hyun Shim
- Department of Pharmacy, College of Pharmacy and Natural Medicine Research Institute, Mokpo National University, Jeonnam 534-729, Republic of Korea
| | - Jung-Il Chae
- Department of Dental Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK21 Plus, Chonbuk National University, Jeonju 561-756, Republic of Korea
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17
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Cho JH, Lee RH, Jeon YJ, Shin JC, Park SM, Choi NJ, Seo KS, Yoon G, Cho SS, Kim KH, Cho JJ, Cho YS, Kim DH, Hong JT, Lee TH, Park HJ, Jung S, Seo JM, Chen H, Dong Z, Chae JI, Shim JH. Role of transcription factor Sp1 in the 4-O-methylhonokiol-mediated apoptotic effect on oral squamous cancer cells and xenograft. Int J Biochem Cell Biol 2015; 64:287-97. [PMID: 25982202 DOI: 10.1016/j.biocel.2015.05.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [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: 09/23/2014] [Revised: 04/14/2015] [Accepted: 05/07/2015] [Indexed: 11/18/2022]
Abstract
Recently, biphenolic components derived from the Magnolia family have been studied for anti-cancer, anti-stress, and anti-inflammatory pharmacological effects. However, the pharmacological mechanism of action of 4-O-methylhonokiol (MH) is not clear in oral cancer. The aim of this study was to investigate the role of MH in apoptosis and its molecular mechanism in oral squamous cell carcinoma (OSCC) cell lines, HN22 and HSC4, as well as tumor xenografts. Here, we demonstrated that MH decreased cell growth and induced apoptosis in HN22 and HSC4 cells through the regulation of specificity protein 1 (Sp1). We employed several experimental techniques such as MTS assay, DAPI staining, PI staining, Annexin-V/7-ADD staining, RT-PCR, western blot analysis, immunocytochemistry, immunohistochemistry, TUNEL assay and in vivo xenograft model analysis. MH inhibited Sp1 protein expression and reduced Sp1 protein levels via both proteasome-dependent protein degradation and inhibition of protein synthesis in HN22 and HSC4 cells; MH did not alter Sp1 mRNA levels. We found that MH directly binds Sp1 by Sepharose 4B pull-down assay and molecular modeling. In addition, treatment with MH or knocking down Sp1 expression suppressed oral cancer cell colony formation. Moreover, MH treatment effectively inhibited tumor growth and Sp1 levels in BALB/c nude mice bearing HN22 cell xenografts. These results indicated that MH inhibited cell growth, colony formation and also induced apoptosis via Sp1 suppression in OSCC cells and xenograft tumors. Thus, MH is a potent anti-cancer drug candidate for oral cancer.
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Affiliation(s)
- Jin Hyoung Cho
- Department of Oral Pharmacology, School of Dentistry and Institute of Dental Bioscience, BK21 plus, Chonbuk National University, Jeonju, Republic of Korea
| | - Ra Ham Lee
- Department of Oral Pharmacology, School of Dentistry and Institute of Dental Bioscience, BK21 plus, Chonbuk National University, Jeonju, Republic of Korea
| | - Young-Joo Jeon
- Department of Oral Pharmacology, School of Dentistry and Institute of Dental Bioscience, BK21 plus, Chonbuk National University, Jeonju, Republic of Korea
| | - Jae-Cheon Shin
- Pohang Center for Evaluation of Biomaterials, Pohang, Gyeongbuk, Republic of Korea
| | - Seon-Min Park
- Pohang Center for Evaluation of Biomaterials, Pohang, Gyeongbuk, Republic of Korea
| | - Nag-Jin Choi
- Department of Animal Science, College of Agricultural and Life Science, Chonbuk National University, Jeonju, Republic of Korea
| | - Kang Seok Seo
- Department of Animal Science and Technology, Sunchon National University, Suncheon, Republic of Korea
| | - Goo Yoon
- Department of Pharmacy, College of Pharmacy, Mokpo National University, Muan-gun, Republic of Korea
| | - Seung-Sik Cho
- Department of Pharmacy, College of Pharmacy, Mokpo National University, Muan-gun, Republic of Korea
| | - Ka Hwi Kim
- Department of Pharmacy, College of Pharmacy, Mokpo National University, Muan-gun, Republic of Korea
| | - Jung Jae Cho
- Department of Pharmacy, College of Pharmacy, Mokpo National University, Muan-gun, Republic of Korea
| | - Young Sik Cho
- Department of Pharmacy, Keimyung University, Daegu, Republic of Korea
| | - Dae Hwan Kim
- College of Pharmacy, Medical Research Center, Chungbuk National University, Cheongju, Republic of Korea
| | - Jin Tae Hong
- Department of Oral Biochemistry, Dental Science Research Institute and the BK21 Project, Medical Research Center for Biomineralization Disorders, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - Tae-Hoon Lee
- Department of Oral Biochemistry, Dental Science Research Institute and the BK21 Project, Medical Research Center for Biomineralization Disorders, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - Hong Ju Park
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
| | - Seunggon Jung
- Department of Oral and Maxillofacial Surgery, Chonnam National University Hwasun Hospital, Gwangju, Republic of Korea
| | - Jae-Min Seo
- Department of Prosthodontics, School of Dentistry, Chonbuk National University, Jeonju, Republic of Korea
| | - Hanyong Chen
- Hormel Institute, University of Minnesota, Austin, MN, USA
| | - Zigang Dong
- Hormel Institute, University of Minnesota, Austin, MN, USA
| | - Jung-Il Chae
- Department of Oral Pharmacology, School of Dentistry and Institute of Dental Bioscience, BK21 plus, Chonbuk National University, Jeonju, Republic of Korea.
| | - Jung-Hyun Shim
- Department of Pharmacy, College of Pharmacy, Mokpo National University, Muan-gun, Republic of Korea.
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Lee RH, Shin JC, Kim KH, Choi YH, Chae JI, Shim JH. Apoptotic effects of 7,8-dihydroxyflavone in human oral squamous cancer cells through suppression of Sp1. Oncol Rep 2015; 33:631-8. [PMID: 25434704 DOI: 10.3892/or.2014.3632] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Accepted: 10/15/2014] [Indexed: 11/06/2022] Open
Abstract
7,8-Dihydroxyflavone (7,8-DHF) is a member of the flavonoid family and has recently been identified as a brain-derived neurotrophic factor mimetic that selectively activates tropomyosin-receptor kinase B with high affinity. The antioxidant and anticancer effects of 7,8-DHF have been reported. However, the pharmacological mechanisms of 7,8-DHF in oral cancer are unclear. Thus, we investigated the mechanisms of the antiproliferative action of 7,8-DHF on HN22 and HSC4 oral squamous cell carcinoma cell lines. We demonstrated that 7,8-DHF decreased cell growth and induced apoptosis in the HN22 and HSC4 cells through regulation of specificity protein 1 (Sp1) using the MTS assay, DAPI staining, Annexin V, propidium iodide staining, reverse transcription-polymerase chain reaction, immunocytochemistry, pull-down assay and western blot analysis. The results showed that the Sp1 protein bound with 7,8-DHF in the HN22 and HSC4 cells. Taken together, the results suggest that 7,8-DHF could modulate Sp1 transactivation and induce apoptotic cell death by regulating the cell cycle and suppressing antiapoptotic proteins. Furthermore, 7,8-DHF may be valuable for cancer prevention and better clinical outcomes.
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Affiliation(s)
- Ra Ham Lee
- Department of Oral Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK21 plus, Chonbuk National University, Jeonju 651-756, Republic of Korea
| | - Jae-Cheon Shin
- Pohang Center for Evaluation of Biomaterials, Pohang Technopark, Jigok-dong, Pohang, Gyeongbuk 790-834, Republic of Korea
| | - Ka-Hwi Kim
- Natural Medicine Research Institute, Department of Pharmacy, College of Pharmacy, Mokpo National University, Muan-gun, Jeonnam 534-729, Republic of Korea
| | - Yung Hyun Choi
- Department of Biochemistry, Dongeui University College of Oriental Medicine, Busan 614-052, Republic of Korea
| | - Jung-Il Chae
- Department of Oral Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK21 plus, Chonbuk National University, Jeonju 651-756, Republic of Korea
| | - Jung-Hyun Shim
- Natural Medicine Research Institute, Department of Pharmacy, College of Pharmacy, Mokpo National University, Muan-gun, Jeonnam 534-729, Republic of Korea
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Lee RH, Cho JH, Jeon YJ, Bang W, Cho JJ, Choi NJ, Seo KS, Shim JH, Chae JI. Quercetin Induces Antiproliferative Activity Against Human Hepatocellular Carcinoma (HepG2) Cells by Suppressing Specificity Protein 1 (Sp1). Drug Dev Res 2015; 76:9-16. [PMID: 25619802 DOI: 10.1002/ddr.21235] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Accepted: 12/02/2014] [Indexed: 12/22/2022]
Abstract
Preclinical Research Quercetin, found in red onions and red apple skin can induce apoptosis insome malignant cells. However, the apoptotic effect of quercetin in hepatocellular carcinoma HepG2 cells via regulation of specificity protein 1 (Sp1) has not been studied. Here, we demonstrated that quercetin decreased cell growth and induce apoptosis in HepG2 cells via suppression of Sp1 using 3-(4,5-dimethyl-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium, inner salt (MTS) assay, 4',6-diamidino-2-phenylindole (DAPI) staining, Annexin V, and Western blot analysis, an effect that was dose- and time-dependent manner. Treatment of HepG2 cells with quercetin reduced cell growth and induced apoptosis, followed by regulation of Sp1 and Sp1 regulatory protein. Taken together, the results suggest that quercetin can induce apoptotic cell death by regulating cell cycle and suppressing antiapoptotic proteins. Therefore, quercetin may be useful for cancer prevention. Drug Dev Res 76 : 9-16, 2015.
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Affiliation(s)
- Ra Ham Lee
- Department of Oral Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK21 plus, Chonbuk National University, Jeonju, 651-756
| | - Jin Hyoung Cho
- Department of Oral Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK21 plus, Chonbuk National University, Jeonju, 651-756
| | - Young-Joo Jeon
- Department of Oral Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK21 plus, Chonbuk National University, Jeonju, 651-756
| | - Woong Bang
- Department of Oral Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK21 plus, Chonbuk National University, Jeonju, 651-756
| | - Jung-Jae Cho
- Department of Pharmacy, Natural Medicine Research Institute, College of Pharmacy, Mokpo National University, Muan-gun, Jeonnam, 534-729
| | - Nag-Jin Choi
- Department of Animal Science, College of Agricultural & Life Science, Chonbuk National University, Jeonju, 651-756
| | - Kang Seok Seo
- Department of Animal Science and Technology, Sunchon National University, Suncheon, Republic of Korea
| | - Jung-Hyun Shim
- Department of Pharmacy, Natural Medicine Research Institute, College of Pharmacy, Mokpo National University, Muan-gun, Jeonnam, 534-729
| | - Jung-Il Chae
- Department of Oral Pharmacology, School of Dentistry and Institute of Oral Bioscience, BK21 plus, Chonbuk National University, Jeonju, 651-756
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Jenkins JH, Fischbach E, Javorsek D, Lee RH, Sturrock PA. Concerning the time dependence of the decay rate of 137Cs. Appl Radiat Isot 2013; 74:50-5. [PMID: 23353092 DOI: 10.1016/j.apradiso.2012.12.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Accepted: 12/18/2012] [Indexed: 11/18/2022]
Abstract
The decay rates of eight nuclides ((85)Kr, (90)Sr, (108)Ag, (133)Ba, (137)Cs, (152)Eu, (154)Eu, and (226)Ra) were monitored by the standards group at the Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany, over the time frame June 1999 to November 2008. We find that the PTB measurements of the decay rate of (137)Cs show no evidence of an annual oscillation, in agreement with the recent report by Bellotti et al. However, power spectrum analysis of PTB measurements of a (133)Ba standard, measured in the same detector system, does show such evidence. This result is consistent with our finding that different nuclides have different sensitivities to whatever external influences are responsible for the observed periodic variations.
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Affiliation(s)
- J H Jenkins
- School of Nuclear Engineering, Purdue University, West Lafayette, IN 47907, USA.
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Knott TK, Hussy N, Cuadra AE, Lee RH, Ortiz-Miranda S, Custer EE, Lemos JR. Adenosine trisphosphate appears to act via different receptors in terminals versus somata of the hypothalamic neurohypophysial system. J Neuroendocrinol 2012; 24:681-9. [PMID: 22340013 PMCID: PMC3314115 DOI: 10.1111/j.1365-2826.2012.02293.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
ATP-induced ionic currents were investigated in isolated terminals and somata of the hypothalamic neurohypophysial system (HNS). Both terminals and somata showed inward rectification of the ATP-induced currents and reversal near 0 mV. In terminals, ATP dose-dependently evoked an inactivating, inward current. However, in hypothalamic somata, ATP evoked a very slowly inactivating, inward current with a higher density, and different dose dependence (EC(50) of 50 μm in somata versus 9.6 μm in terminals). The ATP-induced currents, in both the HNS terminals and somata, were highly and reversibly inhibited by suramin, suggesting the involvement of a purinergic receptor (P2XR). However, the suramin inhibition was significantly different in the two HNS compartments (IC(50) of 3.6 μm in somata versus 11.6 μm in terminals). Also, both HNS compartments show significantly different responses to the purinergic receptor agonists: ATP-γ-S and benzoyl-benzoyl-ATP. Finally, there was an initial desensitisation to ATP upon successive stimulations in the terminals, which was not observed in the somata. These differences in EC(50) , inactivation, desensitisation and agonist sensitivity in terminals versus somata indicate that different P2X receptors mediate the responses in these two compartments of HNS neurones. Previous work has revealed mRNA transcripts for multiple purinergic receptors in micropunches of the hypothalamus. In the HNS terminals, the P2X purinergic receptor types P2X2, 3, 4 and 7 (but not 6) have been shown to exist in AVP terminals. Immonohistochemistry now indicates that P2X4R is only present in AVP terminals and that the P2X7R is found in both AVP and oxytocin terminals and somata. We speculate that these differences in receptor types reflects the specific function of endogenous ATP in the terminals versus somata of these central nervous system neurones.
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Affiliation(s)
- T K Knott
- Department of Microbiology and Physiological Systems and Program in Neuroscience, University of Massachusetts Medical School, Worcester, MA 01655, USA
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Sorensen ME, Lee RH. Associating changes in output behavior with changes in parameter values in spiking and bursting neuron models. J Neural Eng 2011; 8:036014. [PMID: 21525568 PMCID: PMC3164821 DOI: 10.1088/1741-2560/8/3/036014] [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] [Indexed: 11/11/2022]
Abstract
Several recent studies have demonstrated that neuronal models allow multiple parameter value solutions for a given output. In the face of this variability of parameter values, what can be learned about neural function through parameter value differences? Here, in two different models, we examine this question by attempting to reconstruct the source of model output changes based on simple statistical analyses of parameter distributions generated by automated searches. We conclude that changes to parameter values or their associated distributions do not reliably reflect the specific mechanisms responsible for a given change in output.
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Abstract
Electrical activity is the ultimate functional measure of neuronal tissue and recording that activity remains a key technical challenge in neuroscience. The mechanical mismatch between rigid electrodes and compliant brain tissue is a critical limitation in applications where movement is an inherent component. An electrode that permits recording of neural activity, while minimizing tissue disruption, is beneficial for applications that encompass both normal physiological movements and those which require consistent recording during large tissue displacements. In order to test the extreme of this range of movement, flexible electrodes were developed to record activity during and immediately following cortical impact in the rat. Photolithography techniques were used to fabricate flexible electrodes that were readily insertable into the brain using a parylene C base and gold conduction lines and contact pads, permitting custom geometry. We found that this electrode configuration retained mechanical and electrical integrity following both durability studies and large movements within the cortex. This novel flexible electrode configuration provides a novel platform for experimentally examining neuronal activity during a range of brain movements.
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Affiliation(s)
- B A Wester
- Department of Biomedical Engineering, Georgia Institute of Technology, 313 Ferst Dr., Atlanta, GA 30332-0535, USA.
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Lee RH, Carter J, Szot GL, Posselt A, Stock P. Human albumin preserves islet mass and function better than whole serum during pretransplantation islet culture. Transplant Proc 2008; 40:384-6. [PMID: 18374076 DOI: 10.1016/j.transproceed.2008.02.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [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
OBJECTIVE Human islet transplant protocols frequently include a brief period of islet culture before transplantation. Some investigators have suggested that medium supplementation with human serum might quench collagenase activity and provide better culture conditions when compared with human albumin. We studied the effect of whole serum on islet count, islet equivalence, insulin secretion, and DNA content in human islets. METHODS Adult human islets isolated from a single pancreas with purity >50% were cultured in identical 150 islet equivalent samples at 37 degrees C using CMRL 1066-based islet medium (Mediatech) supplemented with either 0.5% human albumin or 10% human AB serum. Prior to culture and after 3 days, islets were assessed in vitro using dithizone staining (n = 4), insulin release after static glucose stimulation (n = 8), and DNA content (n = 8). RESULTS After 3 days, islet mass (defined by the number of islets and islet equivalents counted after dithizone staining) was better preserved in islets cultured in 0.5% human albumin. Although the stimulation index and total DNA content were similar between groups, islets cultured in human albumin demonstrated greater absolute insulin secretion (p = .02) and insulin secretion per cell (p = .02). CONCLUSIONS When used to supplement CMRL 1066-based islet culture medium, human albumin preserves islet mass and secretory capacity better than whole human serum. Human serum offers no advantage in islet preservation or function.
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Affiliation(s)
- R H Lee
- Transplantation Research Laboratory, University of California-San Francisco, San Francisco, California, USA.
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Abstract
OBJECTIVE To establish the prevalence of intrahepatic cholestasis of pregnancy (ICP) in a primarily Latina population in the United States. STUDY DESIGN Over a period of 16 months, a convenience sample of subjects admitted to labor and delivery in the third trimester was enrolled. Each subject completed a questionnaire rating their severity of pruritus on a numeric scale of 1 to 10. Serum was analyzed via radioimmunoassay for total bile acid concentration. ICP was defined as pruritus score >4 and a total serum bile acid concentration of >or=20 micromol/l. Ethnicity was determined from hospital record demographic data. RESULTS All invited participants enrolled in the study. Three hundred and forty subjects were enrolled. Three hundred and sixteen subjects (93%) were identified as Latina. The serum bile acid concentration range for the entire study population was 1 to 580 micromol/l with a mean of 10.4+/-34.9 micromol/l. Twenty-four (7.1%) subjects had a serum bile acid concentration >or=20 micromol/l. A pruritus score >4 was found in 19.7% (67/340). Of the 24 subjects with a bile acid concentration >or=20 micromol/l, 19 also had a pruritus score >4. Thus, the prevalence of ICP in this population was 5.6% (19/340). In subjects with ICP, the mean serum bile acid concentration was 89.5+/-124.0 micromol/l. When controlling for confounders, women with ICP were associated with higher rates of chorioamnionitis (P=0.043) and their fetuses had higher rates of thick meconium (P=0.053). CONCLUSIONS The overall prevalence of ICP in this population was 5.6%, 10 to 100 times higher than previously reported data from the United States. Larger studies of perinatal morbidity examining the diagnostic criteria of cholestasis need to be conducted.
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Affiliation(s)
- R H Lee
- Department of Obstetrics and Gynecology, Division of Maternal Fetal Medicine, Los Angeles County-University of Southern California Medical Center, Women's and Children's Hospital, 90033, USA.
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Kuo JJ, Lee RH, Zhang L, Heckman CJ. Essential role of the persistent sodium current in spike initiation during slowly rising inputs in mouse spinal neurones. J Physiol 2006; 574:819-34. [PMID: 16728453 PMCID: PMC1817738 DOI: 10.1113/jphysiol.2006.107094] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.1] [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: 12/16/2022] Open
Abstract
Spinal motoneurons, like many neurons, respond with repetitive spiking to sustained inputs. The afterhyperpolarization (AHP) that follows each spike, however, decays relatively slowly in motoneurons. The slow depolarization during this decay should allow sodium (Na+) channel inactivation to keep up with its activation and thus should prevent initiation of the next spike. We hypothesized that the persistent component of the total Na+ current provides the mechanism that generates a rate of rise sufficiently rapid to generate a spike. In large cultured spinal neurons, presumed to be primarily motoneurons, inhibition of persistent sodium current (NaP) by the drug riluzole at low concentrations resulted in a loss of repetitive firing. However, cells remained fully capable of producing spikes to transient inputs. These effects of riluzole were not due to insufficient depolarization, enhancement of the AHP, or sustained Na+ channel inactivation. To further test this hypothesis, computer simulations were performed with a kinetic Na+ channel model that provided greater independent control of NaP relative to transient Na+ current (NaT) than that provided by riluzole administration. The model was tuned to generate substantial NaP and exhibited good repetitive firing to slowly rising inputs. When NaP was sharply reduced without significantly altering NaT, the model reproduced the effects of riluzole administration, inducing failure of repetitive firing but allowing single spikes in response to sharp transients. These results strongly support the essential role of NaP in spike initiation to slow inputs in spinal neurons. NaP may play a fundamental role in determining how a neuron responds to sustained inputs.
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Affiliation(s)
- J J Kuo
- Department of Physiology, Northwestern Feinberg School of Medicine, 303 E. Chicago Ave, Chicago, IL 60611, USA
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Song JM, Lee RH, Jung JS. Roles of NF-κB and Bcl-2 in Two Differential Modes of Cell Death of Mouse Cortical Collecting Duct Cells. Kidney Blood Press Res 2005; 28:101-10. [PMID: 15746559 DOI: 10.1159/000084253] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/23/2004] [Indexed: 01/08/2023] Open
Abstract
Recent data have implicated nuclear factor-kappaB (NF-kappaB) and Bcl-2 in the regulation of apoptotic and necrotic cell death in various cells. However, mechanisms of their effects on cell death of renal epithelial cells are not clear. First, we investigated the effect of specific inhibition of NF-kappaB and overexpression of Bcl-2 on necrotic cell death induced by hydrogen peroxide or cisplatin in renal collecting duct cells. M-1 cells, which were derived from outer cortical collecting duct, were stably transfected with the non-phosphorylatable mutant of inhibitory-kappaBalpha (I-kappaBalpha) and Bcl-2. Overexpression of I-kappaBalpha and Bcl-2 did not affect cisplatin-induced necrotic cell death, but overexpression of I-kappaBalpha significantly decreased H2O2-induced cell death. Regarding apoptotic cell death induced by cisplatin, serum deprivation and contact inhibition was increased by overexpression of I-kappaBalpha, whereas overexpression of bcl-2 inhibited the apoptotic cell death. I-kappaBalpha overexpression increased Bax expression and decreased cIAP-1 and -2 expression compared to vector-transfected cells, but did not alter SAPK/JNK activity in the presence or absence of cisplatin. NF-kappaB activity was significantly higher in bcl-2-overexpressing cells than in control cells. These data show that activation of NF-kappaB mediates H2O2-induced necrotic injury, but inhibits apoptotic cell death in renal collecting duct cells, and that Bcl-2 selectively protects apoptotic cell death in M-1 cells.
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Affiliation(s)
- J M Song
- Department of Physiology, College of Medicine, Pusan National University, Busan, Korea
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Abstract
The extensive dendritic tree of the adult spinal motoneuron generates a powerful persistent inward current (PIC). We investigated how this dendritic PIC influenced conversion of synaptic input to rhythmic firing. A linearly increasing, predominantly excitatory synaptic input was generated in triceps ankle extensor motoneurons by slow stretch (duration: 2-10 s) of the Achilles tendon in the decerebrate cat preparation. The firing pattern evoked by stretch was measured by injecting a steady current to depolarize the cell to threshold for firing. The effective synaptic current (I(N), the net synaptic current reaching the soma of the cell) evoked by stretch was measured during voltage clamp. Hyperpolarized holding potentials were used to minimize the activation of the dendritic PIC and thus estimate stretch-evoked I(N) for a passive dendritic tree (I(N,PASS)). Depolarized holding potentials that approximated the average membrane potential during rhythmic firing allowed strong activation of the dendritic PIC and thus resulted in marked enhancement of the total stretch-evoked I(N) (I(N,TOT)). The net effect of the dendritic PIC on the generation of rhythmic firing was assessed by plotting stretch-evoked firing (strong PIC activation) versus stretch-evoked I(N,PASS) (minimal PIC activation). The gain of this input-output function for the neuron (I-O(N)) was found to be ~2.7 times as high as for the standard injected frequency current (F-I) function in low-input conductance neurons. However, about halfway through the stretch, firing rate tended to become constant, resulting in a sharp saturation in I-O(N) that was not present in F-I. In addition, the gain of I-O(N) decreased sharply with increasing input conductance, resulting in much lower stretch-evoked firing rates in high-input conductance cells. All three of these phenomena (high initial gain, saturation, and differences in low- and high-input conductance cells) were also readily apparent in the differences between stretch-evoked I(N,TOT) and I(N, PASS) and thus could be accounted for by the activation of the dendritic PIC. As a result, stretch-evoked I(N,TOT) and F-I provided an accurate prediction of the overall change in stretch-evoked firing. However, in about half of the low-input conductance cells, the rate of rise of firing in response to stretch was not smoothly graded but instead consisted of a rapid surge. Stretch-evoked I(N,TOT) was always smoothly graded. This suggests that although stretch-evoked I(N,TOT) can be used to predict the overall change in firing, prediction of the dynamics of firing may be less accurate.
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Affiliation(s)
- R H Lee
- Department of Physiology, Northwestern University Medical School, Chicago, Illinois 60611, USA
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Lee DH, Kang SK, Lee RH, Ryu JM, Park HY, Choi HS, Bae YC, Suh KT, Kim YK, Jung JS. Effects of peripheral benzodiazepine receptor ligands on proliferation and differentiation of human mesenchymal stem cells. J Cell Physiol 2003; 198:91-9. [PMID: 14584048 DOI: 10.1002/jcp.10391] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The peripheral benzodiazepine receptor (PBR) has been known to have many functions such as a role in cell proliferation, cell differentiation, steroidogenesis, calcium flow, cellular respiration, cellular immunity, malignancy, and apoptosis. However, the presence of PBR has not been examined in mesenchymal stem cells. In this study, we demonstrated the expression of PBR in human bone marrow stromal cells (hBMSCs) and human adipose stromal cells (hATSCs) by RT-PCR and immunocytochemistry. To determine the roles of PBR in cellular functions of human mesenchymal stem cells (hMSCs), effects of diazepam, PK11195, and Ro5-4864 were examined. Adipose differentiation of hMSCs was decreased by high concentration of PBR ligands (50 microM), whereas it was increased by low concentrations of PBR ligands (<10 microM). PBR ligands showed a biphasic effect on glycerol-3-phosphate dehydrogenase (GPDH) activity. High concentration of PBR ligands (from 25 to 75 microM) inhibited proliferation of hMSCs. However, clonazepam, which does not have an affinity to PBR, did not affect adipose differentiation and proliferation of hMSCs. The PBR ligands did not induce cell death in hMSCs. PK11195 (50 microM) and Ro5-5864 (50 microM) induced cell cycle arrest in the G(2)/M phase. These results indicate that PBR ligands play roles in adipose differentiation and proliferation of hMSCs.
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Affiliation(s)
- D H Lee
- Department of Physiology, College of Medicine, Pusan National University, Pusan, Korea
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Abstract
INTRODUCTION We studied the time course of nitric oxide expression in the healing wound and the cell populations responsible for its synthesis. METHODS Twenty four Lewis rats underwent subcutaneous implantation of polyvinyl alcohol sponges. Rats were sacrificed in groups of three on days 1, 3, 5, 7, 10, 14, and 35 after wounding. The conversion of 3H-labeled arginine to 3H-labeled citrulline, with or without N(G)-L-monomethyl-arginine (L-NMMA) in harvested sponges, was measured. Nitrate/nitrite (NOx) in plasma and wound fluid was quantified by Greiss reaction. Inducible nitric oxide synthase (iNOS) gene expression was determined by Northern analysis and reverse transcriptase-polymerase chain reaction (RT-PCR). Inducible NOS was identified in specific wound cell populations by dual-label flow cytometry. RESULTS Nitric oxide synthase (NOS) activity peaked at 24 h after wounding (37.7 +/- 0.9 micromol citrulline per milligram sponge), with a steady decline thereafter. Percentage inhibition of NOS activity by l-NMMA was highest on days 1-7 (70-80%). This declined to 50% by day 10 and to 25% by days 14-35. The iNOS gene expression paralleled NOS biochemical activity. RT-PCR confirmed low-level expression up to 10 days after wounding. Plasma NOx levels remained within a narrow range of 22.6 +/- 1.3 to 29.3 +/- 1.5 microM throughout the postwounding period, while corresponding levels in wound fluid (microM) increased steadily from 27 +/- 3.8 on day 1 to 107.2 +/- 10.0 on day 14. Inducible NOS expression was detectable by fluorescence-activated cell sorting in wound macrophages on days 1 and 3 after wounding. CONCLUSIONS Our findings suggest maximal NOS activity early in cutaneous wound healing, with sustained production up to 10 days after wounding. NOS biochemical activity was paralleled by iNOS gene expression. Plasma NOx remained constant, while wound fluid NOx increased steadily to peak at day 14. Wound macrophages appear to be a source of nitric oxide production in the early phase of wound healing.
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Affiliation(s)
- R H Lee
- Division of Plastic & Reconstructive Surgery, The Johns Hopkins Medical Institutions, Baltimore, Maryland 21287, USA
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Abstract
cis-platinum(II) (cis-diammine dichloroplatinum; cisplatin) is a potent antitumor compound that is widely used for the treatment of many malignancies. An important side-effect of cisplatin is nephrotoxicity, which results from injury to renal tubular epithelial cells and can be manifested as either acute renal failure or a chronic syndrome characterized by renal electrolyte wasting. Recently, apoptosis has been recognized as an important mechanism of cell death mediating the antitumor effect of cisplatin. This study was undertaken to examine the mechanisms of cell death induced by cisplatin in M-1 cells, which were derived from the outer cortical collecting duct cells of SV40 transgenic mice. Treatment of M-1 cells with high concentrations of cisplatin (0.5 and 1 mM) for 2 hr led to necrotic cell death, whereas a 24-hr treatment with 5-20 microM cisplatin led to apoptosis. Antioxidants protected against cisplatin-induced necrosis, but not apoptosis, indicating that reactive oxygen species play a role in mediating necrosis but not apoptosis induced by cisplatin and that the mechanism of cell death induced by cisplatin is concentration dependent. The low concentrations of cisplatin, which induced apoptosis in M-1 cells, did not affect the expression levels of Bcl-2-related proteins and did not activate c-Jun NH2-terminal kinase (SAPK/JNK). Cisplatin induced the translocation of endogenous Bax from the cytosolic to the membrane fractions and, subsequently, the release of cytochrome c. Overexpression of Bcl-2 blocked cisplatin-induced apoptosis and Bax translocation. These observations suggest that the subcellular redistribution of Bax is a critical event in the apoptosis induced by cisplatin.
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Affiliation(s)
- R H Lee
- Research Center for Molecular Medicine, Pusan National University, 1 Ga, Ami-Dong, (602-739), Suh-Gu, Pusan, South Korea
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Lee RH, Chamberlain R, Rapp C. System effects of the Kansas Mental Health Reform Act of 1991. Community Ment Health J 2001; 37:437-45. [PMID: 11419520 DOI: 10.1023/a:1017532130035] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
This paper analyzes the impact of the Kansas Mental Health Reform Act on client outcomes. The Act is of general interest because it reflects a trial of greater accountability without major changes in financial incentives. It made Community Mental Health Centers [CMHCs] gatekeepers that were accountable for services for adults with severe and persistent mental illnesses. The Act sought reductions in hospitalizations rates, expanded use of community support services, and increased independent living. The structure of the Act and Client Status Reports allow rigorous examination of these outcomes. The number of clients served increased significantly. Even though hospital days fell by 23%, there is no clear evidence that the Act itself reduced hospital days per client. The proportion of community support program clients residing independently rose significantly; the proportion participating meaningfully in the labor market fell. The goals of the Act were realized overall, but the performance of CMHCs varied considerably.
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Affiliation(s)
- R H Lee
- University of Kansas School of Medicine, Dept. of Health Policy and Management, Kansas City 66160, USA.
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Abstract
OBJECTIVE The study investigated the nutritional status of Chinese lacto-ovo-vegetarian children aged 4-14 years. METHODOLOGY Dietary intake over 7 days was assessed using a computer program, previously used for a local population-based dietary survey. Anthropometric measurements were made and fasting venous blood was examined for serum lipids, haematological data, iron, vitamin B12 and folate status. Bone mineral density (BMD) of the spine (L2 - L4) was measured as a reflection of calcium status. RESULTS Fifty-one lacto-ovo-vegetarians aged 4-14 years were investigated. The mean +/- standard deviation (SD) daily energy intake was 1600 +/- 425 kcal. The mean (+/- SD) daily protein intake was 1.6 +/- 0.6 g/kg bodyweight which met the United States recommended dietary allowance. Compared to that of the local omnivore diet, the vegetarian diet was closer to the recommended healthy diet with lower fat (20-23%), more fibre (5.8-8.7 g/day) and better polyunsaturated to saturated fatty acid ratio (1.0-1.1). Growth and BMD of the vegetarian children were comparable to the general omnivore population. Two children had iron deficiency and two children had anaemia. The calcium status, as reflected by the BMD, was not impaired. Serum folate and vitamin B12 were within the normal range. Six (25%) boys and four (15%) girls were obese. Three boys had hyperlipidaemia. CONCLUSIONS A Hong Kong Chinese vegetarian diet appears healthy, providing adequate iron and vitamin B12 nutrition, but the prevalence of obesity was high.
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Affiliation(s)
- S S Leung
- Department of Paediatrics, The Chinese University of Hong Kong, Shatin, Hong Kong.
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Abstract
To identify senescence-associated genes (SAGs) in rice leaves, senescence was induced by transferring rice seedlings into darkness. Senescence up-regulated cDNAs were obtained by PCR-based subtractive hybridization. Among 14 SAG clones characterized, 11 were found to be associated with both dark-induced and natural leaf senescence. Three clones were associated only with dark-induced leaf senescence. The possible physiological roles of these SAGs during rice leaf senescence are discussed.
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Affiliation(s)
- R H Lee
- Institute of Botany, Academia Sinica, Taipei, Taiwan
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Jung JS, Lee RH, Koh SH, Kim YK. Changes in expression of sodium cotransporters and aquaporin-2 during ischemia-reperfusion injury in rabbit kidney. Ren Fail 2001; 22:407-21. [PMID: 10901179 DOI: 10.1081/jdi-100100883] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Ischemic renal injury is associated with defects in transport functions of the proximal tubules and urinary concentration ability. To determine whether alterations in expression of various transporter genes contribute to an impairment in renal functions, the expression of various solute transport genes was analyzed in renal cortex and medulla of rabbits with ischemic acute renal failure. Rabbits were subjected to 60 min of renal pedicle clamping followed by 24, 48, or 72 h of reperfusion. Urine volume and glomerular filtration rate were markedly decreased, which were accompanied by an increase in serum creatinine level and fraction Na+ excretion. Glucosuria and phosphaturia were evident during reperfusion periods. These alterations in renal functions were persisted to 72 h after reperfusion. The Na+-dependent uptakes of glucose and phosphate by brush border membrane vesicles were inhibited by 24 h of reperfusion. mRNA levels for Na+-glucose, Na+-phosphate, and Na+-succinate cotransporter analyzed by RT-PCR were not changed by 60 min of ischemia alone, but were significantly reduced by 24 h of reperfusion. mRNA levels for apical Na+-K+-2Cl- cotransporter, NaCl cotransporter, and turea transporter in the medulla were not changed during reperfusion. Protein levels for AQP2 in the medulla, but not AQP1 in the cortex, analyzed by Western blot were significantly reduced at 24 h after reperfusion. These results suggest that reductions in expression of Na+-cotransporter genes in the proximal tubules may be important factors in the impairment in Na+-dependent reabsorption of solutes and that decrease in AQP2 protein may be involved in defect in urinary concentration ability in rabbits with ischemic acute renal failure.
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Affiliation(s)
- J S Jung
- Department of Physiology, College of Medicine, Pusan National University, Korea.
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Lee RH. Use of Internet resources by the University of Kansas MHSA Program. J Health Adm Educ 2001; 19:137-43. [PMID: 17380652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Affiliation(s)
- R H Lee
- Department of Health Policy and Management, School of Medicine, University of Kansas, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA.
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Abstract
In spinal motoneurons in an in vivo preparation, we investigated the relationship between a fast persistent inward current located in or near the soma and the capacity of these cells to fire rhythmically. The fast persistent current could be markedly reduced by prolonged depolarization. Modest reductions resulted in profound changes in the slope of the frequency-current relationship. At greater reduction levels, rhythmic firing failed and could not be restored by increasing injected current. However, fully formed spikes still occurred in a slow, uncoordinated fashion, suggesting that the fast inactivating Na(+) currents that generate the spike itself remained unchanged. Consequently, the fast persistent inward current, which may be primarily generated by persistent Na(+) channels, appears to be essential for initiation of spikes during rhythmic firing. Additionally, it appears that the fast persistent current plays a major role in setting the frequency-current gain.
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Affiliation(s)
- R H Lee
- Department of Physiology, Northwestern University Medical School, Chicago, Illinois 60611, USA
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Lee RH, Efron DT, Tantry U, Stuelten C, Moldawer LL, Abouhamze A, Barbul A. Inhibition of tumor necrosis factor-alpha attenuates wound breaking strength in rats. Wound Repair Regen 2000; 8:547-53. [PMID: 11208182 DOI: 10.1046/j.1524-475x.2000.00547.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.3] [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: 11/20/2022]
Abstract
Exogenous administration of tumor necrosis factor-alpha has been shown to both enhance and attenuate cutaneous healing in a dose-dependent manner. We examined the effects of tumor necrosis factor inhibition in the healing wound by both systemic and local administration of tumor necrosis factor-binding protein. Male Balb/C mice underwent dorsal skin incision with subcutaneous implantation of 20 mg polyvinyl alcohol sponges (4 per animal). In Experiment I, one group (n = 20) received intraperitoneal injections of tumor necrosis factor-binding protein (3 mg/kg) at the time of wounding, while another group (n = 20) received saline. Four animals from each group were euthanized on days 1, 3, 5, 7, and 14 postwounding. In Experiment II, one group (n = 10) received an intraperitoneal injection of tumor necrosis factor-binding protein (3 mg/kg) at the time of wounding and every third day thereafter. Another group (n = 10) received an intraperitoneal injection of saline at the time of wounding and every third day thereafter. In Experiment III, one group received a single intraperitoneal injection of tumor necrosis factor-binding protein (3 mg/kg) at the time of wounding (n = 7), or on postwounding day 4 (n = 7), or day 7 (n = 7). Another group received saline injections at the time of wounding (n = 7), or on postwounding days 4 or 7 (n = 7, respectively). All animals in Experiments II and III were killed at postwounding day 14. Wound breaking strengths were assessed using a tensiometer. Wound fluid collected from the implanted sponges was assayed for tumor necrosis factor-alpha and tumor necrosis factor-binding protein levels using a biological assay and enzyme-linked immunosorbent assay, respectively. Collagen gene expression in sponge granulomata was assessed by Northern analysis. Collagen deposition in sponges was quantified by measuring hydroxyproline content. Wounds were significantly weaker in the animals that received repeated injections of tumor necrosis factor-binding protein with a mean wound breaking strength of 93.1 g vs. 186.6 g in controls (p < 0.05). Wound breaking strength in groups that received a single injection of tumor necrosis factor-binding protein on either day 0, 4, or 7 postwounding were no different than their respective controls. There was no difference in the mean hydroxyproline content of sponges between any of the tumor necrosis factor-binding protein groups and their respective controls. Northern analysis for collagen I and III expression also revealed no differences. These data indicate that continued systemic administration of tumor necrosis factor-binding protein resulted in significantly weaker wounds with no corresponding differences in wound collagen content, and collagen gene expression. This suggests that tumor necrosis factor-alpha inhibition throughout healing leads to a qualitatively impaired wound without a quantitative alteration in collagen deposition.
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Affiliation(s)
- R H Lee
- Department of Surgery, Sinai Hospital of Baltimore, 2435 West Belvedere Avenue, Baltimore, MD 21215, USA
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Lee RH, Heckman CJ. Adjustable amplification of synaptic input in the dendrites of spinal motoneurons in vivo. J Neurosci 2000; 20:6734-40. [PMID: 10964980 PMCID: PMC6772971] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
Abstract
The impact of neuromodulators on active dendritic conductances was investigated by the use of intracellular recording techniques in spinal motoneurons in the adult cat. The well known lack of voltage control of dendritic regions during voltage clamp applied at the soma was used to estimate dendritic amplification of a steady monosynaptic input generated by muscle spindle Ia afferents. In preparations deeply anesthetized with pentobarbital, Ia current either decreased with depolarization or underwent a modest increase at membrane potentials above -40 mV. In unanesthetized decerebrate preparations (which have tonic activity in axons originating in the brainstem and releasing serotonin or norepinephrine), active dendritic currents caused strong amplification of Ia input. In the range of -50 to -40 mV, peak Ia current was over four times as large as that in the pentobarbital-anesthetized preparations. Exogenous administration of a noradrenergic agonist in addition to the tonic activity further enhanced amplification (sixfold increase). Amplification was not seen in preparations with spinal transections. Overall, the dendritic amplification with moderate or strong neuromodulatory drive was estimated to be large enough to allow the motoneurons innervating slow muscle fibers to be driven to their maximum force levels by remarkably small synaptic inputs. In these cells, the main role of synaptic input may be to control the activation of a highly excitable dendritic tree. The neuromodulatory control of synaptic amplification provides motor commands with the potential to adjust the level of amplification to suit the demands of different motor tasks.
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Affiliation(s)
- R H Lee
- Departments of Physiology and Physical Medicine and Rehabilitation, Northwestern University Medical School, Chicago, Illinois 60611, USA
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Affiliation(s)
- C J Heckman
- Department of Physiology, Northwestern University Medical School, Chicago, IL 60611, USA.
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Park MY, Lee RH, Lee SH, Jung JS. Apoptosis induced by inhibition of contact with extracellular matrix in mouse collecting duct cells. Nephron Clin Pract 1999; 83:341-51. [PMID: 10575296 DOI: 10.1159/000045426] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Cell-matrix interactions have major effects upon phenotypic features such as gene regulation, cytoskeletal structure, differentiation and aspects of cell growth control. Detachment from the matrix epithelial cells induces programmed cell death, and this cell detachment induced apoptosis has been referred to as 'anoikis'. This study was undertaken to determine whether apoptosis is induced by inhibition of contact with extracellular matrix (ECM) in collecting duct cells and to investigate the signaling mechanisms of the process. Upon detachment from ECM, mouse inner medullary collecting duct cells (mIMCD-3) and mouse outer cortical collecting duct cells (M-1), which were derived from an SV40 transgenic mouse, entered into programmed cell death. Forced suspension of mIMCD-3 or M-1 cells did not affect the expression of Bcl-2-related proteins and did not activate c-Jun NH(2)-terminal kinase. Detachment of cells from ECM activated p38 mitogen-activated protein kinase (p38), but its inhibition with SB203580 did not protect cells from anoikis. Detachment of cells from matrix inhibited NF-kappaB activity, and the inhibition of NF-kappaB activity by overexpression of nonphosphorylatable I-kappaB increased detachment-induced apoptotic cell death in M-1 cells. Forced suspension of M-1 cells still activated p53 activity. Caspase-8 was activated during anoikis, but the time course of its activation was in accordance with DNA fragmentation. These results indicate that detachment from ECM induces apoptosis in the kidney collecting duct cells. Changes in expression levels of Bcl-2-related proteins or activation of JNK/p38 kinase are not critical for anoikis. Decrease in NF-kappaB activity and activation of p53 induced by inhibition of interaction with ECM play roles in anoikis in SV-40-transformed collecting duct cells. Caspase-8 is activated during detachment-induced apoptosis, the mechanisms of which are independent of activation of cell death receptors.
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Affiliation(s)
- M Y Park
- Department of Physiology, College of Medicine, Pusan National University, Pusan, Korea
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Jung JS, Park MY, Lee RH, Jun JS, Kim YK. Protection against hydrogen peroxide induced injury in renal proximal tubule cell lines by inhibition of poly(ADP-ribose) synthase. Kidney Blood Press Res 1999; 23:14-9. [PMID: 10567849 DOI: 10.1159/000025949] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Radicals including superoxide anions, hydrogen peroxide or hydroxyl radicals and NO or peroxynitrite cause the breakage of DNA strands and activation of poly-(ADP-ribose) synthase (PARS). Recent studies showed that inhibition of PARS activity reduces the tissue injury after exposure to oxidative stress. However, the role of PARS in renal injury by oxidants has not been examined. In this study effect of a PARS inhibitor, 3-aminobenamide (3-AB), on injury of opossum kidney or LLC-PK(1) cells by hydrogen peroxide or tert-butyl hydroperoxide (t-BHP) was examined. The exposure of opossum kidney cells to hydrogen peroxide activated PARS and decreased cellular adenosine triphosphate levels in a concentration-dependent manner. Inhibition of PARS with 3-AB prevented the cell death induced by hydrogen peroxide and also prevented adenosine triphosphate depletion. 3-AB did not have hydroxyl radical scavenging effect. In contrast, t-BHP did not affect the PARS activity. The decrease in cellular adenosine triphosphate levels by t-BHP was less than that by hydrogen peroxide. 3-AB failed to prevent the cell death induced by t-BHP. PARS activation after exposure of hydrogen peroxide was inhibited by addition of t-BHP. However, t-BHP showed an additive effect on cell death with hydrogen peroxide. These results indicate that activation of PARS plays an important role in hydrogen peroxide induced injury in opossum kidney cells and that hydrogen peroxide and t-BHP induce cell injury by different mechanisms.
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Affiliation(s)
- J S Jung
- Department of Physiology, College of Medicine, Pusan National University, Pusan, Korea.
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Abstract
Spinal motoneurons can exhibit bistable behavior, which consists of stable self-sustained firing that is initiated by a brief excitatory input and terminated by brief inhibitory input. This bistable behavior is generated by a persistent inward current (I(PIC)). In cat motoneurons with low input conductances and slow axonal conduction velocities, I(PIC) exhibits little decay with time and thus self-sustained firing is long-lasting. In contrast, in cells that have high input conductances and fast conduction velocities, I(PIC) decays with time, and these cells cannot maintain long duration self-sustained firing. An alternative way to measure bistable behavior is to assess plateau potentials after the action potential has been blocked by intracellular injection of QX-314 to block sodium (Na(+)) currents. However, QX-314 also blocks calcium (Ca(2+)) currents and, because I(PIC) may be generated by a mixture of Ca(2+) and Na(+) currents, a reduction in amplitude of I(PIC) was expected. We therefore systematically compared the properties of I(PIC) in a sample of cells recorded with QX-314 to a control sample of cells without QX-314, which was obtained in a previous study. Single-electrode voltage-clamp techniques were applied in spinal motoneurons in the decerebrate cat preparation following administration of a standardized dose of the noradrenergic alpha1 agonist methoxamine. In the sample with QX-314, the average value of I(PIC) was only about half that in the control sample. However, the reduction of I(PIC) was much greater in cells with slow as compared with fast conduction velocities. Because a substantial portion of I(PIC) originates in dendritic regions and because conduction velocity covaries with the extent of the dendritic tree, this result suggests that QX-314 may fail to diffuse very far into the dendrites of the largest motoneurons. The analysis of the decay of I(PIC) and plateau potentials in cells with QX-314 also produced an unexpected result: QX-314 virtually eliminated time-dependent decay in both I(PIC) and plateau potentials. Consequently, I(PIC) became equally persistent in high and low input conductance cells. Therefore the decay in I(PIC) in high input conductance cells in the absence of QX-314 is not due to an intrinsic tendency of the underlying inward current to decay. Instead it is possible that the decay may result from activation of a slow outward current. Overall, these results show that QX-314 has a profound effect on I(PIC) and thus plateau potentials obtained using QX-314 do not accurately reflect the properties of I(PIC) in normal cells without QX-314.
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Affiliation(s)
- R H Lee
- Departments of Physiology and Physical Medicine and Rehabilitation, Northwestern University Medical School, Chicago, Illinois 60611, USA
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Lee RH, Miller ME. Orthodontic and surgical management of a partially erupted mandibular first molar. Va Dent J 1999; 76:7-9. [PMID: 10853605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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Abstract
Enhancement of bistability in spinal motoneurons in vivo by the noradrenergic alpha1 agonist methoxamine. Like many types of motoneurons, spinal motoneurons in the adult mammal can exhibit bistable behavior. This means that short periods of excitatory input can initiate long periods of self-sustained firing and that equally short periods of inhibition can return the cell to the quiescent state. Usually, the presence of one of the monoamines (either serotonin or norepinephrine) is required for spinal motoneurons to express bistable behaviors. Because the decerebrate cat preparation has tonic activity in monoaminergic fibers that originate in the brain stem and project to spinal motoneurons, these cells sometimes exhibit bistable behavior. However, exogenous application of the noradrenergic alpha1 agonist methoxamine greatly enhances bistable behavior in the decerebrate. The goal of this study was to identify the mechanisms of this action of methoxamine. The total persistent inward current (IPIC) in spinal motoneurons in the decerebrate cat was measured from I-V functions generated by triangular voltage commands applied using discontinuous single electrode voltage clamp. The effect of methoxamine on IPIC was assessed by comparing its properties in a control cell sample without methoxamine to its properties in a sample of cells obtained after application of methoxamine. In most experiments, at least one cell was obtained from each sample. Our results showed that methoxamine approximately doubled the amplitude of IPIC without changing its onset voltage, its offset voltage, or its persistence. The reduced amplitude was a consistent finding within experiments and so was unlikely to be caused by interanimal variability. In addition, methoxamine depolarized motoneurons without altering their input conductances, so that a smaller amount of current was required to reach the onset voltage of IPIC. These effects of methoxamine were approximately equal in all cells. As a result of these changes, methoxamine greatly enhanced the tendency for motoneurons to become bistable. It is proposed that the methoxamine-induced increase in the amplitude of IPIC is effective in enhancing the duration of bistable firing because this increase makes IPIC more resistant to the deactivating effects of the afterhyperpolarizations between spikes.
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Affiliation(s)
- R H Lee
- Department of Physiology, Northwestern University Medical School, Chicago, Illinois 60611, USA
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Abstract
A review of the literature and case records reflected a need for the development of a clinically applicable assessment scheme and classification system for soft-tissue laceration injuries to the face. Herein, a systematic approach for assessing facial lacerations is proposed based on location, depth of penetration, branching, directionality, size, presence of soft-tissue defect, and translation of such injuries into the current procedural terminology (CPT) code. Moreover, a new classification system for facial laceration injuries is presented that may serve as the basis for simplification of current billing codes. Prospective clinical application of this classification system may lead to standardization of facial injury assessment and improvement in the incomplete and inconsistent patient record. This system will establish a reliable database that may identify factors in soft-tissue injuries that contribute to poor aesthetic results or secondary functional deformities. These data will lead to the modification of established treatment plans.
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Affiliation(s)
- R H Lee
- Division of Plastic and Reconstructive Surgery at The Johns Hopkins University School of Medicine, R. Adams Cowley Shock Trauma Center, Baltimore, MD 21287-0981, USA
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Abstract
Motoneurons receive a dense innervation from fibers that descend from the brainstem and release the monoamines serotonin and noradrenalin. When monoamines are present, motoneurons can produce plateau potentials, which are sustained depolarizations that outlast a brief excitatory input. During voltage clamp, steady monosynaptic input from Ia afferents produced a current that persisted after the Ia input ceased. The likely origin of this current was in dendritic regions, where plateau potential channels were probably activated due to the lack of voltage clamp control during the synaptic input. The functional significance of these data is discussed.
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Affiliation(s)
- C J Heckman
- Department of Physiology, Northwestern University Medical School, Chicago, IL 60611, USA
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Abstract
Glucose inhibits meiosis in Saccharomyces cerevisiae at three different steps (IME1 transcription, IME2 transcription, and entry into late stages of meiosis). Because many of the regulatory effects of glucose in yeast are mediated through the inhibition of Snf1 kinase, a component of the glucose repression pathway, we determined the role of SNF1 in regulating meiosis. Deleting SNF1 repressed meiosis at the same three steps that were inhibited by glucose, suggesting that glucose blocks meiosis by inhibiting Snf1. For example, the snf1Delta mutant completely failed to induce IME1 transcripts in sporulation medium. Furthermore, even when this block was bypassed by expression of IME1 from a multicopy plasmid, IME2 transcription and meiotic initiation occurred at only 10 to 20% of the levels seen in wild-type cells. The addition of glucose did not further inhibit IME2 transcription, suggesting that Snf1 is the primary mediator of glucose controls on IME2 expression. Finally, in snf1Delta cells in which both blocks on meiotic initiation were bypassed, early stages of meiosis (DNA replication and commitment to recombination) occurred, but later stages (chromosome segregation and spore formation) did not, suggesting that Snf1 controls later stages of meiosis independently from the two controls on meiotic initiation. Because Snf1 is known to activate the expression of genes required for acetate metabolism, it may also serve to connect glucose and acetate controls on meiotic differentiation.
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Affiliation(s)
- S M Honigberg
- Department of Biology, Syracuse University, Syracuse, New York 13244-1270, USA.
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