1
|
Chen KS, Chen CY, Chang Y, Chen HS, Chen MH. A 2 °C difference affecting the spatiotemporal distribution of small demersal fish assemblages in shallow tropical and subtropical waters of Western Taiwan. Sci Rep 2023; 13:20113. [PMID: 37978224 PMCID: PMC10656438 DOI: 10.1038/s41598-023-47300-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 11/11/2023] [Indexed: 11/19/2023] Open
Abstract
Two OR3 research vessel cruises were conducted at seven nearshore sites from north to south in the western coastal waters off Taiwan in May (late spring) and November (late autumn) 2019 in order to gain insights into the 2 °C difference in the tropical-subtropical fish fauna. Totally, 37 families, 72 genera, and 99 taxas were recorded for the 1809 fishes. Three fish assemblages, the North, South, and Fall-Zhuoshui River (ZRf) groups, were identified as eurythermal, stenothermal, and croaker communities. Their dominants, in rank order, were Tarphops oligolepis, Liachirus melanospilosa, Ostorhinchus fasciatus, and Trachinocephalus myops for the Northern eurythermal group, Arnoglossus tenuis, Eubleekeria splendens, and Ostorhinchus pleuron for the Southern stenothermal group, and Johnius taiwanensis, Chrysochir aureus, and Pennahia macrocephalus for the croaker-ZRf group. Their distribution was markedly correlated with the bottom water temperature, seafloor grain size, and concentration of suspended solids. The influence of a 2 °C difference on the tropical and subtropical demersal fish could indicate how rising temperatures due to climate change are shaping fish communities. The flatfish, Liachirus melanospilos, was distributed northward by 0.5oN and is suggested to be considered as an ecological indicator of the tropicalization of subtropical marine ecosystems in the future.
Collapse
Affiliation(s)
- Kuo-Shu Chen
- Marine Ecology and Conservation Research Center, National Academy of Marine Research, Kaohsiung, 80661, Taiwan
- Department of Oceanography (Marine Biology Group), National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
| | - Chiee-Young Chen
- Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology (Nanzih Campus), Kaohsiung, 81157, Taiwan
| | - Yi Chang
- Graduate Institute of Marine Affairs, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
| | - Hsu-Sen Chen
- Department of Oceanography (Marine Biology Group), National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
- R/V New Ocean Researcher 3, Marine Instrument Center, College of Marine Sciences, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
- Department of Aquaculture, National Pingtung University of Science and Technology, Pingtung, 912301, Taiwan
| | - Meng-Hsien Chen
- Department of Oceanography (Marine Biology Group), National Sun Yat-sen University, Kaohsiung, 80424, Taiwan.
- Institute of Marine Ecology and Conservation, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan.
- Water Resources Research Center, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan.
- Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung, 80708, Taiwan.
| |
Collapse
|
2
|
Meng ZQ, Yan SP, Xu Y, Chen KS. [Ovarian myxoma and sclerosing stromal tumor: report of a case]. Zhonghua Bing Li Xue Za Zhi 2023; 52:1177-1179. [PMID: 37899331 DOI: 10.3760/cma.j.cn112151-20230304-00171] [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: 10/31/2023]
Affiliation(s)
- Z Q Meng
- Department of Pathology, the First Affiliated Hospital of Zhengzhou University, Department of Pathology, College of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450052, China
| | - S P Yan
- Department of Pathology, the First Affiliated Hospital of Zhengzhou University, Department of Pathology, College of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450052, China
| | - Y Xu
- Department of Pathology, the First Affiliated Hospital of Zhengzhou University, Department of Pathology, College of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450052, China
| | - K S Chen
- Department of Pathology, the First Affiliated Hospital of Zhengzhou University, Department of Pathology, College of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450052, China
| |
Collapse
|
3
|
Adeeb N, Dibas M, Griessenauer CJ, Cuellar HH, Salem MM, Xiang S, Enriquez-Marulanda A, Hong T, Zhang H, Taussky P, Grandhi R, Waqas M, Aldine AS, Tutino VM, Aslan A, Siddiqui AH, Levy EI, Ogilvy CS, Thomas AJ, Ulfert C, Möhlenbruch MA, Renieri L, Bengzon Diestro JD, Lanzino G, Brinjikji W, Spears J, Vranic JE, Regenhardt RW, Rabinov JD, Harker P, Müller-Thies-Broussalis E, Killer-Oberpfalzer M, Islak C, Kocer N, Sonnberger M, Engelhorn T, Kapadia A, Yang VXD, Salehani A, Harrigan MR, Krings T, Matouk CC, Mirshahi S, Chen KS, Aziz-Sultan MA, Ghorbani M, Schirmer CM, Goren O, Dalal SS, Finkenzeller T, Holtmannspötter M, Buhk JH, Foreman PM, Cress MC, Hirschl RA, Reith W, Simgen A, Janssen H, Marotta TR, Stapleton CJ, Patel AB, Dmytriw AA. Learning Curve for Flow Diversion of Posterior Circulation Aneurysms: A Long-Term International Multicenter Cohort Study. AJNR Am J Neuroradiol 2022; 43:1615-1620. [PMID: 36229166 PMCID: PMC9731249 DOI: 10.3174/ajnr.a7679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Accepted: 06/28/2022] [Indexed: 02/01/2023]
Abstract
BACKGROUND AND PURPOSE Flow diversion has gradually become a standard treatment for intracranial aneurysms of the anterior circulation. Recently, the off-label use of the flow diverters to treat posterior circulation aneurysms has also increased despite initial concerns of rupture and the suboptimal results. This study aimed to explore the change in complication rates and treatment outcomes across time for posterior circulation aneurysms treated using flow diversion and to further evaluate the mechanisms and variables that could potentially explain the change and outcomes. MATERIALS AND METHODS A retrospective review using a standardized data set at multiple international academic institutions was performed to identify patients with ruptured and unruptured posterior circulation aneurysms treated with flow diversion during a decade spanning January 2011 to January 2020. This period was then categorized into 4 intervals. RESULTS A total of 378 procedures were performed during the study period. Across time, there was an increasing tendency to treat more vertebral artery and fewer large vertebrobasilar aneurysms (P = .05). Moreover, interventionalists have been increasingly using fewer overlapping flow diverters per aneurysm (P = .07). There was a trend toward a decrease in the rate of thromboembolic complications from 15.8% in 2011-13 to 8.9% in 2018-19 (P = .34). CONCLUSIONS This multicenter experience revealed a trend toward treating fewer basilar aneurysms, smaller aneurysms, and increased usage of a single flow diverter, leading to a decrease in the rate of thromboembolic and hemorrhagic complications.
Collapse
Affiliation(s)
- N Adeeb
- From the Departments of Neurosurgery and Interventional Neuroradiology (N.A., M.D., H.H.C., A.S.A., A.A.), Louisiana State University Hospital, Shreveport, Louisiana
| | - M Dibas
- From the Departments of Neurosurgery and Interventional Neuroradiology (N.A., M.D., H.H.C., A.S.A., A.A.), Louisiana State University Hospital, Shreveport, Louisiana
| | - C J Griessenauer
- Departments of Neurosurgery and Radiology (C.J.G., C.M.S., O.G., S.S.D.), Geisinger, Danville, Pennsylvania
- Department of Neurology/Institut of Neurointervention (C.J.G., E.M.-T.-B., M.K.-O.), University Hospital Salzburg, Paracelsus Medical University, Salzburg, Austria
| | - H H Cuellar
- From the Departments of Neurosurgery and Interventional Neuroradiology (N.A., M.D., H.H.C., A.S.A., A.A.), Louisiana State University Hospital, Shreveport, Louisiana
| | - M M Salem
- Neurosurgical Service (M.M.S., A.E.-M., P.T., C.S.O.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
| | - S Xiang
- Department of Neurosurgery (S.X., H.Z., T.H.), Xuanwu Hospital, Capital Medical University, Beijing, China
| | - A Enriquez-Marulanda
- Neurosurgical Service (M.M.S., A.E.-M., P.T., C.S.O.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
| | - T Hong
- Department of Neurosurgery (S.X., H.Z., T.H.), Xuanwu Hospital, Capital Medical University, Beijing, China
| | - H Zhang
- Department of Neurosurgery (S.X., H.Z., T.H.), Xuanwu Hospital, Capital Medical University, Beijing, China
| | - P Taussky
- Neurosurgical Service (M.M.S., A.E.-M., P.T., C.S.O.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
- Department of Neurosurgery (P.T., R.G.), University of Utah, Salt Lake City, Utah
| | - R Grandhi
- Department of Neurosurgery (P.T., R.G.), University of Utah, Salt Lake City, Utah
| | - M Waqas
- Department of Neurosurgery (M.W., V.M.T., A.H.S., E.I.L.), State University of New York at Buffalo, Buffalo, New York
| | - A S Aldine
- From the Departments of Neurosurgery and Interventional Neuroradiology (N.A., M.D., H.H.C., A.S.A., A.A.), Louisiana State University Hospital, Shreveport, Louisiana
| | - V M Tutino
- Department of Neurosurgery (M.W., V.M.T., A.H.S., E.I.L.), State University of New York at Buffalo, Buffalo, New York
| | - A Aslan
- From the Departments of Neurosurgery and Interventional Neuroradiology (N.A., M.D., H.H.C., A.S.A., A.A.), Louisiana State University Hospital, Shreveport, Louisiana
| | - A H Siddiqui
- Department of Neurosurgery (M.W., V.M.T., A.H.S., E.I.L.), State University of New York at Buffalo, Buffalo, New York
| | - E I Levy
- Department of Neurosurgery (M.W., V.M.T., A.H.S., E.I.L.), State University of New York at Buffalo, Buffalo, New York
| | - C S Ogilvy
- Neurosurgical Service (M.M.S., A.E.-M., P.T., C.S.O.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
| | - A J Thomas
- Department of Neurological Surgery (A.J.T.), Cooper University Health Care, Cooper Medical School of Rowan University, Camden, New Jersey
| | - C Ulfert
- Department of Neuroradiology (C.U., M.A.M.), Universitätsklinikum Heidelberg, Heidelberg, Germany
| | - M A Möhlenbruch
- Department of Neuroradiology (C.U., M.A.M.), Universitätsklinikum Heidelberg, Heidelberg, Germany
| | - L Renieri
- Department of Interventional Neuroradiology (L.R.), University of Florence, Florence, Italy
| | - J D Bengzon Diestro
- Division of Diagnostic and Therapeutic Neuroradiology (J.D.B.D., J.S., T.R.M.), St. Michael's Hospital, Toronto, Ontario, Canada
| | - G Lanzino
- Department of Neurological Surgery (G.L., W.B.), Mayo Clinic, Rochester, Minnesota
| | - W Brinjikji
- Department of Neurological Surgery (G.L., W.B.), Mayo Clinic, Rochester, Minnesota
| | - J Spears
- Division of Diagnostic and Therapeutic Neuroradiology (J.D.B.D., J.S., T.R.M.), St. Michael's Hospital, Toronto, Ontario, Canada
| | - J E Vranic
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - R W Regenhardt
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - J D Rabinov
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - P Harker
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - E Müller-Thies-Broussalis
- Department of Neurology/Institut of Neurointervention (C.J.G., E.M.-T.-B., M.K.-O.), University Hospital Salzburg, Paracelsus Medical University, Salzburg, Austria
| | - M Killer-Oberpfalzer
- Department of Neurology/Institut of Neurointervention (C.J.G., E.M.-T.-B., M.K.-O.), University Hospital Salzburg, Paracelsus Medical University, Salzburg, Austria
| | - C Islak
- Department of Neuroradiology (C.I., N.K.), Cerrahpasa Medical School, Istanbul University, Istanbul, Turkey
| | - N Kocer
- Department of Neuroradiology (C.I., N.K.), Cerrahpasa Medical School, Istanbul University, Istanbul, Turkey
| | - M Sonnberger
- Department of Neuroradiology (M.S.), Kepler Universitätsklinikum Linz, Linz, Austria
| | - T Engelhorn
- Department of Neuroradiology (T.E.), University Hospital Erlangen, Erlangen, Germany
| | - A Kapadia
- Departments of Medical Imaging and Neurosurgery (A.K.), Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada
| | - V X D Yang
- Neurointerventional Program (V.X.D.Y., A.A.D.), Departments of Medical Imaging & Clinical Neurological Sciences, London Health Sciences Centre, Western University, Ontario, Canada
| | - A Salehani
- Department of Neurosurgery (A. Salehani, M.R.H.), University of Alabama at Birmingham, Birmingham, Alabama
| | - M R Harrigan
- Department of Neurosurgery (A. Salehani, M.R.H.), University of Alabama at Birmingham, Birmingham, Alabama
| | - T Krings
- Division of Interventional Neuroradiology (T.K.), Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada
| | - C C Matouk
- Department of Neurosurgery (C.C.M.), Yale School of Medicine, New Haven, Connecticut
| | - S Mirshahi
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - K S Chen
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - M A Aziz-Sultan
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - M Ghorbani
- Division of Vascular and Endovascular Neurosurgery (M.G.), Firoozgar Hospital, Iran University of Medical Sciences, Tehran, Iran
| | - C M Schirmer
- Departments of Neurosurgery and Radiology (C.J.G., C.M.S., O.G., S.S.D.), Geisinger, Danville, Pennsylvania
| | - O Goren
- Departments of Neurosurgery and Radiology (C.J.G., C.M.S., O.G., S.S.D.), Geisinger, Danville, Pennsylvania
| | - S S Dalal
- Departments of Neurosurgery and Radiology (C.J.G., C.M.S., O.G., S.S.D.), Geisinger, Danville, Pennsylvania
| | - T Finkenzeller
- Institute of Radiology and Neuroradiology (T.F., M.H.), Klinikum Nuernberg Sued, Paracelsus Medical University Nuernberg, Nuernberg, Germany
| | - M Holtmannspötter
- Institute of Radiology and Neuroradiology (T.F., M.H.), Klinikum Nuernberg Sued, Paracelsus Medical University Nuernberg, Nuernberg, Germany
- Department of Neuroradiology (M.H.), Klinikum Weiden, Weiden, Germany
| | - J-H Buhk
- Department of Neuroradiology (J.-H.B.), University Hospital Hamburg Eppendorf, Hamburg, Germany
| | - P M Foreman
- Neuroscience and Rehabilitation Institute (P.M.F., M.C.C., R.A.H.), Orlando Health, Orlando, Florida
| | - M C Cress
- Neuroscience and Rehabilitation Institute (P.M.F., M.C.C., R.A.H.), Orlando Health, Orlando, Florida
| | - R A Hirschl
- Neuroscience and Rehabilitation Institute (P.M.F., M.C.C., R.A.H.), Orlando Health, Orlando, Florida
| | - W Reith
- Clinic for Diagnostic and Interventional Neuroradiology (W.R., A. Simgen), Universitätsklinikum des Saarlandes, Homburg/Saar, Germany
| | - A Simgen
- Clinic for Diagnostic and Interventional Neuroradiology (W.R., A. Simgen), Universitätsklinikum des Saarlandes, Homburg/Saar, Germany
| | - H Janssen
- Institute for Neuroradiology (H.J.), Klinikum Ingolstadt, Ingolstadt, Germany
| | - T R Marotta
- Division of Diagnostic and Therapeutic Neuroradiology (J.D.B.D., J.S., T.R.M.), St. Michael's Hospital, Toronto, Ontario, Canada
| | - C J Stapleton
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - A B Patel
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - A A Dmytriw
- Neurointerventional Program (V.X.D.Y., A.A.D.), Departments of Medical Imaging & Clinical Neurological Sciences, London Health Sciences Centre, Western University, Ontario, Canada
- Neuroendovascular Program (J.E.V., R.W.R., J.D.R., P.H., S.M., K.S.C., M.A.A.-S., C.J.S., A.B.P., A.A.D.), Massachusetts General Hospital & Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| |
Collapse
|
4
|
Liu K, Sun MM, Zhao ZH, Wei N, Jiang GZ, Wang ZY, Zhang L, Zhu XY, Dai LP, Yang HM, Wang T, Chen KS. Effect of RhoC silencing on multiple myeloma xenografts and angiogenesis in nude mice. J BIOL REG HOMEOS AG 2019; 33:1387-1394. [PMID: 31507136] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this study, we investigated the expression of RhoC in the multiple myeloma (MM) cell line RPMI- 8226, as well as the effects of silencing RhoC on the growth of tumor xenografts and tumor-induced angiogenesis in nude mice with MM. For this purpose, we transduced RPMI-8226 cells with lentiviral particles overexpressing short hairpin RNAs (shRNA) targeting RhoC. Tumor xenografts were generated by subcutaneously injecting nude mice with RPMI-8226 cells overexpressing control shRNA [negative control (NC) group] or the RhoC shRNA [the experimental (S) group], respectively. RhoC protein and mRNA levels in the tumor xenografts were measured. Nude mice were also subcutaneously inoculated with Matrigel mixed with vascular endothelial growth factor, and CD31 and KI67 levels in the tumor xenografts were measured by immunohistochemistry. Similarly, we assessed tumor xenograft growth and angiogenesis in Matrigel implants in the mice of both groups. We found that RhoC levels, microvessel density, and CD31 labeling index were more reduced in the S group than in the NC group. However, there was no significant difference in the size of tumor xenografts between the 2 groups. The number of new vessels and the neovascular length in the Matrigel implants were significantly lower in the S group than in the NC group. Therefore, we concluded that RhoC expression in myeloma xenografts has important effects on the induction of angiogenesis.
Collapse
Affiliation(s)
- K Liu
- Department of Pathology, The First Affiliated Hospital of Zhengzhou University, Henan Key Laboratory of Tumor Pathology, Zhengzhou, China
| | - M M Sun
- Department of Urinary Surgery, Harbin Medical University Cancer Hospital, Harbin, China
| | - Z H Zhao
- Department of Pathology, The First Affiliated Hospital of Zhengzhou University, Henan Key Laboratory of Tumor Pathology, Zhengzhou, China
| | - N Wei
- Department of Pathology, The First Affiliated Hospital of Zhengzhou University, Henan Key Laboratory of Tumor Pathology, Zhengzhou, China
| | - G Z Jiang
- Department of Pathology, The First Affiliated Hospital of Zhengzhou University, Henan Key Laboratory of Tumor Pathology, Zhengzhou, China
| | - Z Y Wang
- Department of Pathology, The First Affiliated Hospital of Zhengzhou University, Henan Key Laboratory of Tumor Pathology, Zhengzhou, China
| | - L Zhang
- Department of Pathology, The First Affiliated Hospital of Zhengzhou University, Henan Key Laboratory of Tumor Pathology, Zhengzhou, China
| | - X Y Zhu
- Histology and Embryology Teaching and Research Center, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, China
| | - L P Dai
- Henan Academy of Medical and Pharmaceutical Sciences Department of Epidemmiology, Zhengzhou, China
| | - H M Yang
- Henan Medical College Basic Medical Department, Zhengzhou, China
| | - T Wang
- Department of Pathology, The First Affiliated Hospital of Zhengzhou University, Henan Key Laboratory of Tumor Pathology, Zhengzhou, China
| | - K S Chen
- Department of Pathology, The First Affiliated Hospital of Zhengzhou University, Henan Key Laboratory of Tumor Pathology, Zhengzhou, China
| |
Collapse
|
5
|
Chen JY, He LI, Zhang HX, Sun MM, Chen KS. Effects of tumor-associated macrophages on the proliferation and migration of esophageal cancer-associated lymphatic endothelial cells. J BIOL REG HOMEOS AG 2018; 32:207-218. [PMID: 29684998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The aim of this study was to explore whether M2 macrophages can be transformed into M1 macrophages, and to investigate the effect of different types of macrophages on the proliferation, migration and ring-forming ability of esophageal cancer-related lymphatic endothelial cell (LEC). Human monocytic leukemia cell line (THP-1 cell) was induced to differentiate to M1 macrophages (M1 group) and M2 macrophages (M2 group), and co-cultured with esophageal cancer-associated LEC. The individual esophageal cancer co-cultured with LEC was used as control. Different types of macrophages were observed by Cell counting kit-8 (CCK-8). Enzyme-linked immunosorbent assay (ELISA) was used to detect the VEGF-C concentration; the expression of VEGFR-3 protein and its mRNA was detected by Western blot and qRT-PCR, respectively. The positive rate of the M1 group induced by IFN-γ and LPS was significantly higher than that of M2 macrophages (48.57%5.98% vs 25.83%1.95%). The expression of VEGF-C in the supernatant of the M2 group was higher than that in the control group, but no significant differences regarding the expression of VEGF-C between M1 and control groups were found. In addition, the expression of VEGFR-3 on both mRNA and protein in esophageal cancer-related LEC of the M2 group was significantly higher than those in the control group; however, the M1 group had a significantly lower VEGFR-3 level on both mRNA and protein than the control group. Human M2 macrophages can be transformed into M1 macrophages, and can promote the proliferation, migration and ring-forming ability of esophageal cancer-associated LEC.
Collapse
Affiliation(s)
- J Y Chen
- The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - L I He
- China-US (Henan) Hormel Cancer Institute, Zhengzhou, China
| | - H X Zhang
- The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - M M Sun
- Affiliated Tumor Hospital of Zhengzhou University, Zhengzhou, China
| | - K S Chen
- The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| |
Collapse
|
6
|
Chen KS, Tan TH, Yesudian PD. Clinical, demographic and laboratory characteristics of methotrexate-responsive eczema. J Eur Acad Dermatol Venereol 2016; 30:e158-e159. [PMID: 26558602 DOI: 10.1111/jdv.13465] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- K S Chen
- Department of Dermatology, West Suffolk NHS Foundation Trust, Bury St Edmunds, UK
| | - T H Tan
- Department of Dermatology, Betsi Cadwaladr University Health Board, Bodelwyddan, UK
| | - P D Yesudian
- Department of Dermatology, Betsi Cadwaladr University Health Board, Bodelwyddan, UK.
| |
Collapse
|
7
|
Lee CH, Chen YS, Hou CW, Jeng KC, Chen KS. Anti-inflammatory effect of longan seed extract in carrageenan stimulated Sprague-Dawley rats. Iran J Basic Med Sci 2016; 19:870-874. [PMID: 27746869 PMCID: PMC5048123] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
OBJECTIVES Longan seeds have been used as a folk medicine in China. Longan seed extract (LSE) is known for antioxidative, antiproliferative, hypoglycemic, and hypouremic effects. However, its anti-inflammatory effect has not been shown. MATERIALS AND METHODS In this study, Sprague-Dawley (SD) rats were given LSE orally (vehicle, 10, and 30 mg/kg) for 3 days to its test anti-inflammatory effect by injecting λ-carrageenan (CARR) in the right hind paw or lipopolysaccharide (LPS), IP. For the positive control, animals were given aspirin (20 mg/kg) orally and treated likewise. Serum or tissue samples from treated rats were collected after 3 hr of stimulation. Regarding the in vitro study, BV2 microglial cells were stimulated with LPS in the presence of LSE or normal saline for 10 min or 24 hr for Western blot and ELISA assay, respectively. RESULTS LSE reduced CARR-induced edema in the experimental animals. LSE also reduced LPS/CARR-induced nitric oxide (NO), interleukin-1β (IL1β), IL6, and COX2 productions. These inflammatory factors were also reduced dose dependently by LSE in LPS-stimulated BV2 cells. Furthermore, Western blot analysis revealed that LSE inhibited LPS activated c-Jun NH2-terminal protein kinase (JNK), extracellular signal-regulated kinases (ERKs), and p38 MAP kinases signaling pathways, caspase-3, inducible NO synthase, and COX2 expressions. CONCLUSION LSE pretreatment suppressed CARR- and LPS-induced inflammations and these effects might be through the inhibition of MAP kinases signaling pathways and inflammatory factors.
Collapse
Affiliation(s)
- Ching-Hsiao Lee
- Department of Medical Technology, Jen-Teh Junior College of Medicine, Nursing and Management, Miaoli, Taiwan
| | - Yuh-Shuen Chen
- Department of Food Nutrition, Hungkuang University, Taichung, Taiwan
| | - Chien-Wei Hou
- Department of Biotechnology and Pharmaceutical Technology, Yuanpei University, Hsinchu City, Taiwan
| | - Kee-Ching Jeng
- Department of Medical Research, Tungs’ Taichung MetroHarbor Hospital, Taichung, Taiwan
| | - Kuo-Shu Chen
- Division of Allergy, Immunology and Rheumatology, Tungs’ Taichung MetroHarbor Hospital, Taichung, Taiwan,Corresponding author: Kuo-Shu Chen. Division of Allergy, Immunology and Rheumatology, Tungs’ Taichung MetroHarbor Hospital, Taichung, Taiwan. Tel: +886-4-26581919, Fax: +886-4-26567684;
| |
Collapse
|
8
|
Cui L, Sun MM, Zhao ZH, Yang JP, Zheng YP, He LL, Chen KS, Fan QX. BLCA-4 and UBC combined detection for early diagnosis of bladder cancer. J BIOL REG HOMEOS AG 2016; 30:485-490. [PMID: 27358136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The objective of the present study was to report the clinical significance of bladder cancer specific nuclear matrix protein 4 (BLCA-4) and urinary bladder cancer (UBC) on early diagnosis of bladder cancers. Enzyme-linked immunosorbent assay (ELISA) was used to detect BLCA-4 and UBC of 56 bladder cancer patients and 26 patients with urinary tract benign diseases, serving as controls. Urine exfoliated cell test was performed, and then the significance of BLCA-4 and UBC on the diagnosis of bladder cancers was analyzed. The sensitivity of BLCA-4 and UBC of the bladder cancer patients was significantly higher than that of the urine exfoliated cell test (P less than 0.05). The difference of BLCA-4 and UBC was not significant (P >0.05). The difference of BLCA-4 and UBC in the tumors with different gradings and stagings was not significant (P >0.05). Combined detection of BLCA-4 and UBC could improve the diagnosis sensitivity and specificity of bladder cancers with the advantages of high maneuverability, repeatability and objective results.
Collapse
Affiliation(s)
- L Cui
- Department of Pathology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou city, PR China
| | - M M Sun
- Department of Pathology, Henan Cancer Hospital, Zhengzhou city, PR China
| | - Z H Zhao
- Department of Pathology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou city, PR China
| | - J P Yang
- Department of Pathology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou city, PR China
| | - Y P Zheng
- Department of Pathology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou city, PR China
| | - L L He
- Department of Pathology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou city, PR China
| | - K S Chen
- Department of Pathology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou city, PR China
| | - Q X Fan
- Medical oncology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou City, PR China
| |
Collapse
|
9
|
Ko TM, Tsai CY, Chen SY, Chen KS, Yu KH, Chu CS, Huang CM, Wang CR, Weng CT, Yu CL, Hsieh SC, Tsai JC, Lai WT, Tsai WC, Yin GD, Ou TT, Cheng KH, Yen JH, Liou TL, Lin TH, Chen DY, Hsiao PJ, Weng MY, Chen YM, Chen CH, Liu MF, Yen HW, Lee JJ, Kuo MC, Wu CC, Hung SY, Luo SF, Yang YH, Chuang HP, Chou YC, Liao HT, Wang CW, Huang CL, Chang CS, Lee MTM, Chen P, Wong CS, Chen CH, Wu JY, Chen YT, Shen CY. Use of HLA-B*58:01 genotyping to prevent allopurinol induced severe cutaneous adverse reactions in Taiwan: national prospective cohort study. BMJ 2015; 351:h4848. [PMID: 26399967 PMCID: PMC4579807 DOI: 10.1136/bmj.h4848] [Citation(s) in RCA: 125] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
OBJECTIVE To evaluate the use of prospective screening for the HLA-B*58:01 allele to identify Taiwanese individuals at risk of severe cutaneous adverse reactions (SCARs) induced by allopurinol treatment. DESIGN National prospective cohort study. SETTING 15 medical centres in different regions of Taiwan, from July 2009 to August 2014. PARTICIPANTS 2926 people who had an indication for allopurinol treatment but had not taken allopurinol previously. Participants were excluded if they had undergone a bone marrow transplant, were not of Han Chinese descent, and had a history of allopurinol induced hypersensitivity. DNA purified from 2910 participants' peripheral blood was used to assess the presence of HLA-B*58:01. MAIN OUTCOME MEASURES Incidence of allopurinol induced SCARs with and without screening. RESULTS Participants who tested positive for HLA-B*58:01 (19.6%, n=571) were advised to avoid allopurinol, and were referred to an alternate drug treatment or advised to continue with their prestudy treatment. Participants who tested negative (80.4%, n=2339) were given allopurinol. Participants were interviewed once a week for two months to monitor symptoms. The historical incidence of allopurinol induced SCARs, estimated by the National Health Insurance research database of Taiwan, was used for comparison. Mild, transient rash without blisters developed in 97 (3%) participants during follow-up. None of the participants was admitted to hospital owing to adverse drug reactions. SCARs did not develop in any of the participants receiving allopurinol who screened negative for HLA-B*58:01. By contrast, seven cases of SCARs were expected, based on the estimated historical incidence of allopurinol induced SCARs nationwide (0.30% per year, 95% confidence interval 0.28% to 0.31%; P=0.0026; two side one sample binomial test). CONCLUSIONS Prospective screening of the HLA-B*58:01 allele, coupled with an alternative drug treatment for carriers, significantly decreased the incidence of allopurinol induced SCARs in Taiwanese medical centres.
Collapse
Affiliation(s)
- Tai-Ming Ko
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan Graduate Institute of Integrated Medicine, China Medical University, Taichung, Taiwan
| | - Chang-Youh Tsai
- Division of Allergy, Immunology, and Rheumatology, Taipei Veterans General Hospital, Taipei Faculty of Medicine, National Yang Ming University, Taipei
| | | | | | | | - Chih-Sheng Chu
- Kaohsiung Medical University Hospital and Kaohsiung Medical University, Kaohsiung, Taiwan Kaohsiung Municipal Hsiaokang Hospital, Kaohsiung Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung
| | - Chung-Ming Huang
- Graduate Institute of Integrated Medicine, China Medical University, Taichung, Taiwan China Medical University Hospital, Taichung
| | | | - Chia-Tse Weng
- National Cheng Kung University Hospital, Tainan, Taiwan
| | - Chia-Li Yu
- National Taiwan University Hospital, Taipei
| | | | - Jer-Chia Tsai
- Kaohsiung Medical University Hospital and Kaohsiung Medical University, Kaohsiung, Taiwan Kaohsiung Municipal Hsiaokang Hospital, Kaohsiung Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung
| | - Wen-Ter Lai
- Kaohsiung Medical University Hospital and Kaohsiung Medical University, Kaohsiung, Taiwan Kaohsiung Municipal Hsiaokang Hospital, Kaohsiung Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung
| | - Wen-Chan Tsai
- Kaohsiung Medical University Hospital and Kaohsiung Medical University, Kaohsiung, Taiwan Kaohsiung Municipal Hsiaokang Hospital, Kaohsiung Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung
| | | | - Tsan-Teng Ou
- Kaohsiung Medical University Hospital and Kaohsiung Medical University, Kaohsiung, Taiwan Kaohsiung Municipal Hsiaokang Hospital, Kaohsiung Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung
| | - Kai-Hung Cheng
- Kaohsiung Medical University Hospital and Kaohsiung Medical University, Kaohsiung, Taiwan Kaohsiung Municipal Hsiaokang Hospital, Kaohsiung Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung
| | - Jeng-Hsien Yen
- Kaohsiung Medical University Hospital and Kaohsiung Medical University, Kaohsiung, Taiwan Kaohsiung Municipal Hsiaokang Hospital, Kaohsiung Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung
| | - Teh-Ling Liou
- Division of Allergy, Immunology, and Rheumatology, Taipei Veterans General Hospital, Taipei
| | - Tsung-Hsien Lin
- Kaohsiung Medical University Hospital and Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Der-Yuan Chen
- Faculty of Medicine, National Yang Ming University, Taipei Department of Medical Education and Research, and Division of Allergy, Immunology and Rheumatology, Taichung Veterans General Hospital, Taichung Institute of Biomedical Science and Rong Hsing Research Centre for Translational Medicine, National Chung Hsing University, Taichung
| | - Pi-Jung Hsiao
- Kaohsiung Medical University Hospital and Kaohsiung Medical University, Kaohsiung, Taiwan Kaohsiung Municipal Hsiaokang Hospital, Kaohsiung Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung
| | - Meng-Yu Weng
- National Cheng Kung University Hospital, Tainan, Taiwan
| | - Yi-Ming Chen
- Faculty of Medicine, National Yang Ming University, Taipei Department of Medical Education and Research, and Division of Allergy, Immunology and Rheumatology, Taichung Veterans General Hospital, Taichung Institute of Biomedical Science and Rong Hsing Research Centre for Translational Medicine, National Chung Hsing University, Taichung
| | | | - Ming-Fei Liu
- National Cheng Kung University Hospital, Tainan, Taiwan
| | - Hsueh-Wei Yen
- Kaohsiung Medical University Hospital and Kaohsiung Medical University, Kaohsiung, Taiwan Kaohsiung Municipal Hsiaokang Hospital, Kaohsiung Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung
| | - Jia-Jung Lee
- Kaohsiung Medical University Hospital and Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Mei-Chuan Kuo
- Faculty of Renal Care, Kaohsiung Medical University, Kaohsiung
| | - Chen-Ching Wu
- Kaohsiung Medical University Hospital and Kaohsiung Medical University, Kaohsiung, Taiwan Kaohsiung Municipal Hsiaokang Hospital, Kaohsiung Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung
| | - Shih-Yuan Hung
- Division of Nephrology, E-Da Hospital, Kaohsiung School of Medicine, I-Shou University, Kaohsiung
| | - Shue-Fen Luo
- Chang Gung Memorial Hospital, Taoyuan, Taiwan Chang Gung University, Taoyuan
| | - Ya-Hui Yang
- Department of Occupational Safety and Hygiene, Fooyin University, Kaohsiung Department of Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung
| | - Hui-Ping Chuang
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Yi-Chun Chou
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Hung-Ting Liao
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Chia-Wen Wang
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Chun-Lin Huang
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Chia-Shuo Chang
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Ming-Ta Michael Lee
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan Laboratory for International Alliance on Genomic Research, Core for Genomic Medicine, RIKEN Centre for Integrative Medical Sciences, Yokohama, Kanagawa, Japan
| | - Pei Chen
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Chih-Shung Wong
- Department of Anaesthesiology, Cathay General Hospital, Taipei PharmiGene, Taipei
| | - Chien-Hsiun Chen
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan School of Chinese Medicine, China Medical University, Taichung
| | - Jer-Yuarn Wu
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan School of Chinese Medicine, China Medical University, Taichung
| | - Yuan-Tsong Chen
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan Department of Pediatrics, Duke University Medical Center, Durham, NC, USA
| | - Chen-Yang Shen
- Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan College of Public Health, China Medical University Hospital, Taichung Taiwan Biobank, Academia Sinica, Taipei
| |
Collapse
|
10
|
Shih YY, Hung CC, Gong GC, Chung WC, Wang YH, Lee IH, Chen KS, Ho CY. Enhanced Particulate Organic Carbon Export at Eddy Edges in the Oligotrophic Western North Pacific Ocean. PLoS One 2015; 10:e0131538. [PMID: 26171611 PMCID: PMC4501708 DOI: 10.1371/journal.pone.0131538] [Citation(s) in RCA: 27] [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: 04/15/2015] [Accepted: 06/03/2015] [Indexed: 11/18/2022] Open
Abstract
Mesoscale eddies in the subtropical oligotrophic ocean are ubiquitous and play an important role in nutrient supply and oceanic primary production. However, it is still unclear whether these mesoscale eddies can efficiently transfer CO2 from the atmosphere to deep waters via biological pump because of the sampling difficulty due to their transient nature. In 2007, particulate organic carbon (POC) fluxes, measured below the euphotic zone at the edge of warm eddy were 136-194 mg-C m-2 d-1 which was greatly elevated over that (POC flux = 26-35 mg-C m-2 d-1) determined in the nutrient-depleted oligotrophic waters in the Western North Pacific (WNP). In 2010, higher POC fluxes (83-115 mg-C m-2 d-1) were also observed at the boundary of mesoscale eddies in the WNP. The enhanced POC flux at the edge of eddies was mainly attributed to both large denuded diatom frustules and zooplankton fecal pellets based on scanning electron microscopy (SEM) examination. The result suggests that mesoscale eddies in the oligotrophic waters in the subtropical WNP can efficiently increase the oceanic carbon export flux and the eddy edge is a crucial conduit in carbon sequestration to deep waters.
Collapse
Affiliation(s)
- Yung-Yen Shih
- Department of Oceanography, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
| | - Chin-Chang Hung
- Department of Oceanography, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
- * E-mail:
| | - Gwo-Ching Gong
- Institute of Marine Environmental Chemistry and Ecology, National Taiwan Ocean University, Keelung, 20224, Taiwan
| | - Wan-Chen Chung
- Institute of Marine Environmental Chemistry and Ecology, National Taiwan Ocean University, Keelung, 20224, Taiwan
| | - Yu-Huai Wang
- Department of Oceanography, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
| | - I-Huan Lee
- Department of Oceanography, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
| | - Kuo-Shu Chen
- Department of Oceanography, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
| | - Chuang-Yi Ho
- Department of Oceanography, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
| |
Collapse
|
11
|
Zhang SY, Feng C, Xu CJ, Zhu CQ, Chen KS. Polymorphisms in different EST-SSR types derived from the Chinese bayberry Myrica rubra, Myricaceae) transcriptome. Genet Mol Res 2015; 14:6037-41. [PMID: 26125803 DOI: 10.4238/2015.june.1.21] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Most plant expressed sequence tag-simple sequence repeats (EST-SSRs) are not polymorphic, and it is important to learn the characteristics of highly polymorphic EST-SSRs. In this study, 357 compound and 5557 non-compound EST-SSRs, identified from the transcriptome of the Chinese bayberry (Myrica rubra 'Biqi'), were divided into 11 types based on their characteristics. Polymorphisms in all 11 EST-SSR types were investigated in 10 cultivars. The percentages of polymorphic loci ranged from 12.9 to 87.5%, with 2-ntL having the highest, followed by 3-ntL, Compound B, and Compound A. The number of alleles and the polymorphic information content of 2-ntL and Compound B were the highest, followed by 2-ntM and Compound A. Therefore, we recommend that 2-ntL, Compound B, and Compound A EST-SSRs should be preferentially selected for the screening of polymorphic EST-SSRs in the Chinese bayberry. Our results should facilitate genetic and breeding studies of this species, and provide a reference for similar study in other plant species.
Collapse
Affiliation(s)
- S Y Zhang
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development, and Quality Improvement, Zhejiang University, Zijingang Campus, Hangzhou, China
| | - C Feng
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development, and Quality Improvement, Zhejiang University, Zijingang Campus, Hangzhou, China
| | - C J Xu
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development, and Quality Improvement, Zhejiang University, Zijingang Campus, Hangzhou, China
| | - C Q Zhu
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development, and Quality Improvement, Zhejiang University, Zijingang Campus, Hangzhou, China
| | - K S Chen
- Laboratory of Fruit Quality Biology/The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development, and Quality Improvement, Zhejiang University, Zijingang Campus, Hangzhou, China
| |
Collapse
|
12
|
Chen CY, Lai CC, Chen KS, Hsu CC, Hung CC, Chen MH. Total and organic mercury concentrations in the muscles of Pacific albacore (Thunnus alalunga) and bigeye tuna (Thunnus obesus). Mar Pollut Bull 2014; 85:606-612. [PMID: 24559740 DOI: 10.1016/j.marpolbul.2014.01.039] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Revised: 01/07/2014] [Accepted: 01/13/2014] [Indexed: 06/03/2023]
Abstract
Muscles of 115 North Pacific albacore (ALB, Thunnus alalunga) and 75 Pacific bigeye tuna (BET, Thunnus obesus), collected from 2001 to 2006, were analyzed. No ALB, but 13 large BET had organic mercury (OH g) concentrations exceeding 1 μg g(-1) wet weight. For both ALB and BET, total mercury (THg) and OH g concentrations were significantly and positively correlated with fork length (FL) and body weight. The muscle Hg bioaccumulation rates of BET were higher than those of ALB, particularly in the adult fish. Moreover, the lines had crossover points among the two species that imply the young BET (FL<110 cm) contains lower muscle Hg concentrations than ALB of the same size. The suggested weekly dietary intake of ALB and small-BET meats is 340 g, and of BET meat it is 150 g for a 60-kg person based on the provisional tolerable weekly intake (PTWI) of methylmercury set by the WHO.
Collapse
Affiliation(s)
- Chiee-Young Chen
- Department of Environmental Engineering, National Kaohsiung Marine University, Kaohsiung 81143, Taiwan
| | - Chien-Cheng Lai
- Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Kuo-Shu Chen
- Department of Oceanography and Asia-Pacific Ocean Research Center, National Sun Yat-sen University, Kaohsiung 80424, Taiwan; Institute of Oceanography, College of Science, National Taiwan University, Taipei 10617, Taiwan
| | - Chien-Chung Hsu
- Institute of Oceanography, College of Science, National Taiwan University, Taipei 10617, Taiwan
| | - Chin-Chang Hung
- Department of Oceanography and Asia-Pacific Ocean Research Center, National Sun Yat-sen University, Kaohsiung 80424, Taiwan; Taiwan Ocean Research Institute, National Applied Research Laboratories, Kaohsiung 85243, Taiwan
| | - Meng-Hsien Chen
- Department of Oceanography and Asia-Pacific Ocean Research Center, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.
| |
Collapse
|
13
|
Hung CC, Ko FC, Gong GC, Chen KS, Wu JM, Chiang HL, Peng SC, Santschi PH. Increased zooplankton PAH concentrations across hydrographic fronts in the East China Sea. Mar Pollut Bull 2014; 83:248-257. [PMID: 24775063 DOI: 10.1016/j.marpolbul.2014.03.045] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Revised: 03/17/2014] [Accepted: 03/29/2014] [Indexed: 06/03/2023]
Abstract
The Changjiang has transported large quantities of polycyclic aromatic hydrocarbons (PAHs) to the East China Sea (ECS), but information of these pollutants in zooplankton is limited. To understand PAHs pollution in zooplankton in the ECS, total concentrations of PAHs in zooplankton from surface waters were measured. Values of PAHs ranged from 2 to 3500 ng m(-3) in the ECS, with highest PAHs levels located at the salinity front between the Changjiang Diluted Water (CDW) and the mid-shelf waters. In contrast, concentrations of zooplankton PAHs in the mid-shelf and outer-shelf waters were significantly lower (2-23 ng m(-3)) than those in the CDW. These results demonstrate that PAHs are conspicuously accumulated in zooplankton at the salinity front between the CDW and the mid-shelf waters. These higher levels of PAHs in zooplankton at the salinity front may be further biomagnified in marine organisms of higher trophic levels through their feeding activities.
Collapse
Affiliation(s)
- Chin-Chang Hung
- Department of Oceanography and Asia-Pacific Ocean Research Center, National Sun Yat-sen University, Kaohsiung 80424, Taiwan; Taiwan Ocean Research Institute, National Applied Research Laboratories, Kaohsiung, Taiwan.
| | - Fung-Chi Ko
- National Museum of Marine Biology and Aquarium, Pingtung 94450, Taiwan; Institute of Marine Biodiversity and Evolutionary Biology, National Dong Hwa University, Pingtung 94450, Taiwan
| | - Gwo-Ching Gong
- Taiwan Ocean Research Institute, National Applied Research Laboratories, Kaohsiung, Taiwan; Institute of Marine Environmental Chemistry and Ecology, National Taiwan Ocean University, Keelung 20224, Taiwan
| | - Kuo-Shu Chen
- Department of Oceanography and Asia-Pacific Ocean Research Center, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Jian-Ming Wu
- Institute of Marine Environmental Chemistry and Ecology, National Taiwan Ocean University, Keelung 20224, Taiwan
| | - Hsin-Lun Chiang
- Institute of Marine Environmental Chemistry and Ecology, National Taiwan Ocean University, Keelung 20224, Taiwan
| | - Sen-Chueh Peng
- Department of Electrical Engineering, National Formosa University, Yunlin 63201, Taiwan
| | - Peter H Santschi
- Department of Marine Sciences, Laboratory for Oceanography and Environmental Research, Texas A&M University at Galveston, 200 Seawolf Parkway, Galveston, TX 77553, USA
| |
Collapse
|
14
|
Sun MM, Zhang MZ, Chen Y, Li SL, Zhang W, Ya GW, Chen KS. Effect of PTEN antisense oligonucleotide on oesophageal squamous cell carcinoma cell lines. J Int Med Res 2013; 40:2098-108. [PMID: 23321166 DOI: 10.1177/030006051204000607] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
OBJECTIVE To investigate the effects of a phosphatase and tensin homologue (PTEN) antisense oligonucleotide on PTEN and mammalian target of rapamycin (mTOR) mRNA and protein, cell proliferation and apoptosis in oesophageal squamous cell carcinoma (OCSS) cell lines. METHODS EC9706 and EC1 cells were transfected with PTEN antisense oligonucleotide, sense oligonucleotide or nonsense oligonucleotide. Cell proliferation and apoptosis were quantified. Immuno cyto chemistry and in situ hybridization were used to determine PTEN and mTOR protein and mRNA levels, respectively. RESULTS Transfection with PTEN antisense oligonucleotide dose- and time-dependently enhanced cell proliferation and inhibited apoptosis in both EC9706 and EC1 cells. PTEN mRNA and protein were significantly downregulated, and mTOR protein and mRNA were significantly upregulated. CONCLUSION These data suggest that PTEN is an important tumour suppressor gene in the development of OSCC.
Collapse
Affiliation(s)
- M M Sun
- Department of Oncology, First Affiliated Hospital, Zhengzhou University, Zhengzhou, China
| | | | | | | | | | | | | |
Collapse
|
15
|
Sun MM, Zhang MZ, Chen Y, Li SL, Zhang W, Ya GW, Chen KS. Mechanistic target of rapamycin small interfering RNA and rapamycin synergistically inhibit tumour growth in a mouse xenograft model of human oesophageal carcinoma. J Int Med Res 2013. [PMID: 23206445 DOI: 10.1177/030006051204000502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
OBJECTIVES To investigate the effect of mechanistic target of rapamycin (mTOR)-specific small interfering RNA (siRNA) and rapamycin on tumour size and levels of hypoxia inducible factor 1α(HIF-1α), vascular endothelial growth factor (VEGF) and mTOR proteins, and mTOR mRNA, in a mouse xenograft model of human oesophageal carcinoma. METHODS Tumours were induced in BALB/c nude mice using the human oesophageal squamous cell carcinoma cell line, EC1, injected subcutaneously. Animals were divided into four treatment groups (n = 5 per group) after 7 days: control (phosphate buffered saline, daily intraperitoneal [i.p.] injection); 50 μg/kg rapamycin, daily i.p. injection; 3 μg/kg mTOR siRNA, daily i.p. injection; combined mTOR siRNA and rapamycin, daily i.p. injections. Tumour volume was measured 21 days after xenograft. Levels of mTOR, VEGF and HIF-1α were assessed via immunohistochemistry and in situ hybridization. RESULTS mTOR siRNA and/or rapamycin significantly decreased tumour volume and levels of HIF-1α, VEGF and mTOR protein, and mTOR mRNA. Combination treatment was significantly more effective than either treatment alone. CONCLUSIONS mTOR siRNA and/or rapamycin inhibited the growth of oesophageal carcinoma in vivo. This may represent a novel and effective treatment strategy for oesophageal carcinoma.
Collapse
Affiliation(s)
- M M Sun
- Department of Oncology, First Affiliated Hospital, Zhengzhou University, Zhengzhou, China
| | | | | | | | | | | | | |
Collapse
|
16
|
Choong SS, Latiff ZA, Mohamed M, Lim LLW, Chen KS, Vengidasan L, Razali H, Abdul Rahman EJ, Ariffin H. Childhood adrenocortical carcinoma as a sentinel cancer for detecting families with germline TP53 mutations. Clin Genet 2012; 82:564-8. [PMID: 22233476 DOI: 10.1111/j.1399-0004.2012.01841.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Li-Fraumeni syndrome (LFS) is a highly penetrant, autosomal dominant disorder where affected individuals carry a 50% risk of developing cancer before 30 years of age. It is most commonly associated with mutations in the tumour suppressor gene, TP53. Adrenocortical carcinoma (ACC) is a very rare paediatric cancer, and up to 80% of affected children are found to carry germline TP53 mutations. Hence, we propose using childhood ACC incidence as selection criteria for referral for TP53 mutation testing, independent of familial cancer history. Under the auspices of the Malaysian Society of Paediatric Haematology-Oncology, four eligible children diagnosed with ACC over a 30-month study period were referred for mutation testing. Three had a germline TP53 mutation. Subsequent TP53 testing in relatives showed two inherited mutations and one de novo mutation. These findings strongly support paediatric ACC as a useful sentinel cancer for initiating a germline TP53/LFS detection programme, particularly in countries where the lack of structured oncogenetic practice precludes the identification of families with LFS features.
Collapse
Affiliation(s)
- S S Choong
- Department of Paediatrics, University of Malaya, Kuala Lumpur, Malaysia
| | | | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Wang HK, Huang CH, Chen KS, Peng YP, Lai CH. Measurement and source characteristics of carbonyl compounds in the atmosphere in Kaohsiung city, Taiwan. J Hazard Mater 2010; 179:1115-1121. [PMID: 20427126 DOI: 10.1016/j.jhazmat.2010.03.122] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2009] [Revised: 03/29/2010] [Accepted: 03/30/2010] [Indexed: 05/29/2023]
Abstract
The concentrations of eighteen atmospheric carbonyls species were measured by the LpDNPH-Cartridge and the microcomputer air sampling device at Nan-Chie (northern part) and Hsiung-Kong (southern part) sites in Kaohsiung city, southern Taiwan. These samples were then analyzed using a high performance liquid chromatography (HPLC). Measurements showed that the highest concentrations of carbonyls were formaldehyde (18.33 and 18.74 microg m(-3)) at the Nan-Chie and Hsiung-Kong site, followed by acetaldehyde (14.90 and 15.71 microg m(-3)). The concentrations of total carbonyls were higher at Hsiung-Kong site (66.96 microg m(-3)) than at Nan-Chie site (60.41 microg m(-3)). The concentrations of total carbonyls at Nan-Chie site (or Hsiung-Kong site) were 74.06 microg m(-3) (89.99 microg m(-3)) in summer and 37.14 microg m(-3) (46.50 microg m(-3)) in winter, due to the fact that photochemical activities are stronger in summer than in winter. The results of principal component analysis (PCA)/absolute principal component scores (APCS) suggest that the primary pollution sources at Nan-Chie were vehicle exhausts (gasoline and diesel engines), stationary emissions (petrochemical and food industry) and restaurant emissions, and the primary pollution sources at Hsiung-Kong were vehicle exhausts (gasoline and diesel engines), stationary emissions (metal assembly and petrochemical industry) and restaurant emissions.
Collapse
Affiliation(s)
- H K Wang
- Institute of Environmental Engineering, National Sun Yat-Sen University, 70 Lein_hei Road, Ku-San District, Kaohsiung 80424, Taiwan, ROC
| | | | | | | | | |
Collapse
|
18
|
Chuang MS, Huang HH, Dixon KM, Chen KS, Mao CL, Chen CL. Detection of urine and blood clenbuterol following short-term oral administration in the horse. Immunopharmacol Immunotoxicol 2009; 32:171-6. [PMID: 19821644 DOI: 10.3109/08923970903179688] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND AND AIM The pharmacokinetics of clenbuterol in equine urine and blood was investigated. MATERIAL AND METHODS Urine and blood samples were collected following 3-day multiple oral administrations. The samples were examined using enzyme-linked immunosorbent assay and further confirmed by solid phase extraction and capillary electrophoresis. RESULTS Urinary clenbuterol was detectable until day 14 after the last dose. The urinary excretion of clenbuterol was characterized by a biphasic pattern. The half-lives of the bi-exponential elimination (t(1/2alpha) and t(1/2beta)) for urinary clenbuterol were about 12.1 and 48 hours. After a single oral administration (4 microg/kg) of clenbuterol, the half-life of serum clenbuterol was approximately 11.4 hours.
Collapse
Affiliation(s)
- M S Chuang
- Department of Veterinary Medicine, National Chung Hsing University, Taichung, Taiwan
| | | | | | | | | | | |
Collapse
|
19
|
Chen KS, Li HC, Wang HK, Wang WC, Lai CH. Measurement and receptor modeling of atmospheric polycyclic aromatic hydrocarbons in urban Kaohsiung, Taiwan. J Hazard Mater 2009; 166:873-879. [PMID: 19155130 DOI: 10.1016/j.jhazmat.2008.11.094] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2008] [Revised: 11/09/2008] [Accepted: 11/25/2008] [Indexed: 05/27/2023]
Abstract
The concentrations of 21 individual polycyclic aromatic hydrocarbons (PAHs) and total suspended particles (TSPs) were measured using high-volume air samplers at Tzuo-Yin and Hsiung-Kong sites in Kaohsiung City, Taiwan, for four seasons from 2005 to 2006. The gaseous and particulate phases of individual PAHs were identified using a gas chromatograph with a flame-ionization detector (GC/FID). Measurements show that the concentrations of total (gas+particulate) PAHs generally followed the seasonal variations of the concentrations of TSP (107.2-117.1 microg m(-3)), being the highest in winter (143.9-182.9 ng m(-3)) and lowest in summer (81.4-95.2 ng m(-3)) at both sites. Most PAH species were low-weight PAHs (approximately 80.8-82.0%), followed by high-weight PAHs (10.5-14.6%) and medium-weight PAHs (6.5-6.8%). The fractions of gaseous PAHs decreased with molecular weight or ring number. The particle phase (60.2(73.5%) dominated the high-weight PAHs. Results of receptor model show that industrial combustions (49.1-63.7%) contributed most to ambient PAHs, followed by restaurant emissions (18.4-39.7%) and mobile sources (11.3-22.8%) at the Tzuo-Yin site. At the Hsiung-Kong, mobile sources (49.5-63.3%) contributed most to ambient PAHs, followed by restaurant emissions (19.8-36.6%) and industrial combustions (13.7-27.1%). The differences in the results at the two sites are mainly attributed to the different industries at each site.
Collapse
Affiliation(s)
- K S Chen
- Institute of Environmental Engineering, National Sun Yat-Sen University, 70 Lein_hei Road, Ku-san District, Kaohsiung 80424, Taiwan, ROC.
| | | | | | | | | |
Collapse
|
20
|
Chen DY, Hsieh CW, Chen KS, Chen YM, Lin FJ, Lan JL. Association of interleukin-18 promoter polymorphisms with WHO pathological classes and serum IL-18 levels in Chinese patients with lupus nephritis. Lupus 2009; 18:29-37. [DOI: 10.1177/0961203308094559] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Accumulating evidence indicates that interleukin (IL)-18 has a central role in the pathogenesis of lupus nephritis (LN). Although two recent studies showed that IL-18 promoter gene polymorphisms might be associated with systemic lupus erythematosus (SLE), to our knowledge, there have not been any reports concerning their association with LN. The aim of our study was to investigate the association of IL-18 promoter polymorphisms with World Health Organization pathological classes and identify their functional correlations. Sequence-specific primer polymerase chain reaction and the restriction fragment length polymorphism method were used to analyse the genotypes of IL-18 promoter polymorphism at the position −607 in 101 unrelated patients with LN, 64 non-renal patients with SLE and 174 ethnically matched healthy controls. Serum IL-18 levels were determined using enzyme-linked immunosorbent assay during the active phase. Immunohistochemical analysis was performed for IL-18 expression on renal biopsies from 72 patients with LN. Our results showed that patients with non-renal SLE had significantly higher frequencies of SNP−607/AA when compared to patients with LN (37.5% vs 18.8%, P < 0.05). LN patients with the AA genotype had significantly lower levels of serum IL-18 than those with the CA or CC genotype ( P < 0.01) and also had lower levels of glomerular IL-18 expression than those with the CC genotype ( P < 0.05). Significantly, higher frequencies of the SNP−607/AA genotype were observed in LN patients with WHO class III than in those with class IV (34.6% vs 15.6%, P < 0.05). The SNP−607/AA genotype was not observed in patients with LN who progressed to end-stage renal failure that required haemodialysis or renal transplantation. In conclusion, the SNP−607/AA genotype that had lower IL-18 levels might be a genetically protective factor against renal involvement in Chinese patients with SLE and against development of severe nephritis in patients with LN.
Collapse
Affiliation(s)
- DY Chen
- Department of Allergy, Immunology and Rheumatology, Taichung Veterans General Hospital, Taichung, Taiwan; Faculty of Medicine, National Yang-Ming University, Taipei, Taiwan; Institute of Medical Technology, National Chung-Hsing University, Taichung, Taiwan
| | - CW Hsieh
- Department of Allergy, Immunology and Rheumatology, Taichung Veterans General Hospital, Taichung, Taiwan; Faculty of Medicine, National Yang-Ming University, Taipei, Taiwan; Institute of Medical Technology, National Chung-Hsing University, Taichung, Taiwan
| | - KS Chen
- Department of Immunology and Rheumatology, Tung’s Taichung Metro Harbor Hospital, Taichung, Taiwan
| | - YM Chen
- Department of Allergy, Immunology and Rheumatology, Taichung Veterans General Hospital, Taichung, Taiwan; Faculty of Medicine, National Yang-Ming University, Taipei, Taiwan
| | - FJ Lin
- Department of Allergy, Immunology and Rheumatology, Taichung Veterans General Hospital, Taichung, Taiwan; Institute of Clinical Nutrition, Hong-Kuang University, Taichung, Taiwan
| | - JL Lan
- Department of Allergy, Immunology and Rheumatology, Taichung Veterans General Hospital, Taichung, Taiwan; Faculty of Medicine, National Yang-Ming University, Taipei, Taiwan; Institute of Medical Technology, National Chung-Hsing University, Taichung, Taiwan
| |
Collapse
|
21
|
Chen KS, Lin YS, Yang SS. Application of thermotolerant microorganisms for biofertilizer preparation. J Microbiol Immunol Infect 2007; 40:462-473. [PMID: 18087625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
BACKGROUND AND PURPOSE Intensive agriculture is practised in Taiwan, and compost application is very popular as a means of improving the soil physical properties and supplying plant nutrition. We tested the potential of inoculation with thermotolerant microorganisms to shorten the maturity and improve the quality of biofertilizer prepared by composting. METHODS Thermotolerant microorganisms were isolated from compost and reinoculated for the preparation of biofertilizer. The physical, chemical and biological properties of the biofertilizer were determined during composting. The effects of biofertilizer application on the growth and yield of rape were also studied. RESULTS Among 3823 colonies of thermotolerant microorganisms, Streptomyces thermonitrificans NTU-88, Streptococcus sp. NTU-130 and Aspergillus fumigatus NTU-132 exhibited high growth rates and cellulolytic and proteolytic activities. When a mixture of rice straw and swine manure were inoculated with these isolates and composted for 61 days, substrate temperature increased initially and then decreased gradually during composting. Substrate pH increased from 7.3 to 8.5. Microbial inoculation enhanced the rate of maturity, and increased the content of ash and total and immobilized nitrogen, improved the germination rate of alfalfa seed, and decreased the content of total organic carbon and the carbon/nitrogen ratio. Biofertilizer application increased the growth and yield of rape. CONCLUSIONS Inoculation of thermotolerant and thermophilic microorganisms to agricultural waste for biofertilizer preparation enhances the rate of maturity and improves the quality of the resulting biofertilizer. Inoculation of appropriate microorganisms in biofertilizer preparation might be usefully applied to agricultural situations.
Collapse
Affiliation(s)
- Kuo-Shu Chen
- Institute of Microbiology and Biochemistry, National Taiwan University, Taipei, Taiwan
| | | | | |
Collapse
|
22
|
Hefti F, Armanini MP, Beck KD, Caras IW, Chen KS, Godowski PJ, Goodman LJ, Hammonds RG, Mark MR, Moran P, Nishimura MC, Phillips HS, Shih A, Valverde J, Winslow JW. Development of neurotrophic factor therapy for Alzheimer's disease. Ciba Found Symp 2007; 196:54-63; discussion 63-9. [PMID: 8991782 DOI: 10.1002/9780470514863.ch5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- F Hefti
- Department of Neuroscience, Genentech Inc., South San Francisco, CA 94080, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Rose-Hellekant TA, Schroeder MD, Brockman JL, Zhdankin O, Bolstad R, Chen KS, Gould MN, Schuler LA, Sandgren EP. Estrogen receptor-positive mammary tumorigenesis in TGFalpha transgenic mice progresses with progesterone receptor loss. Oncogene 2007; 26:5238-46. [PMID: 17334393 PMCID: PMC2587149 DOI: 10.1038/sj.onc.1210340] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
We characterized the novel NRL-transforming growth factor alpha (NRL-TGFalpha) transgenic mouse model in which growth factor - steroid receptor interactions were explored. The NRL promoter directs transgene expression to mammary ductal and alveolar cells and is nonresponsive to estrogen manipulations in vitro and in vivo. NRL-TGFalpha mice acquire proliferative hyperplasias as well as cystic and solid tumors. Quantitative transcript analysis revealed a progressive decrease in estrogen receptor alpha (ER) and progesterone receptor (PR) mRNA levels with tumorigenesis. However, ER protein was evident in all lesion types and in surrounding stromal cells using immunohistochemistry. PR protein was identified in normal epithelial cells and in very few cells of small epithelial hyperplasias, but never in stromal or tumor cells. Prophylactic ovariectomy significantly delayed tumor development and decreased incidence. Finally, while heterozygous (+/-) p53 mice did not acquire mammary lesions, p53+/- mice carrying the NRL-TGFalpha transgene developed ER negative/PR negative undifferentiated carcinomas. These data demonstrate that unregulated TGFalpha expression in the mammary gland leads to oncogenesis that is dependent on ovarian steroids early in tumorigenesis. Resulting tumors resemble a clinical phenotype of ER+/PR-, and when combined with a heterozygous p53 genotype, ER-/PR-.
Collapse
Affiliation(s)
- T A Rose-Hellekant
- Department of Pathobiological Sciences, University of Wisconsin-Madison, Madison, WI, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Abstract
Alzheimer's disease (AD) is the most common neurodegenerative affliction of the elderly, presenting with progressive memory loss and dementia and terminating with death. There have been significant advances in understanding the biology and subsequent diagnosis of AD; however, the furious pace of research has not yet translated into a disease-modifying treatment. While scientific inquiry in AD is largely centered on identifying biological players and pathological mechanisms, the day-to-day realities of AD patients and their caregivers revolve around their steady and heartbreaking cognitive decline. In the past decade, AD research has been fundamentally transformed by the development of genetically modified animal models of amyloid-driven neurodegeneration. These important in vivo models not only replicate some of the hallmark pathology of the disease, such as plaque-like amyloid accumulations and astrocytic inflammation, but also some of the cognitive impairments relevant to AD. In this article, we will provide a detailed review of the behavioral and cognitive deficits present in several transgenic mouse models of AD and discuss their functional changes in response to experimental treatments.
Collapse
Affiliation(s)
- D T Kobayashi
- Pharmacology Department, Elan Pharmaceuticals, South San Francisco, CA 94080, USA
| | | |
Collapse
|
25
|
Abstract
BACKGROUND Although laparoscopy is commonly adopted for the diagnosis and management of various medical or surgical problems, its use for patients with peritoneal dialysis has seldom been addressed. This retrospective study analyzes the indications and clinical effects of this procedure. METHODS A retrospective chart was drawn up and a videotape review performed for 18 laparoscopic procedures involving 198 patients receiving peritoneal dialysis on a long-term basis at our dialysis unit from May 1992 to June 2002. The clinical and demographic parameters in this study included gender, age, underlying renal diseases, duration of peritoneal dialysis before laparoscopy, indications of laparoscopic intervention, laparoscopic findings, time of operation, laparoscopic procedures, postoperative complications, mortality, and catheter results. RESULTS A total of 18 laparoscopic procedures were performed in 17 uremia patients, with indications including catheter malfunction in five cases, preimplantation evaluation of peritoneal space in three cases, evaluation of the etiology underlying intractable peritonitis in nine cases, and verification of the cause for dialysate leakage in one case. Four (80%) of the five catheter malfunctions were successfully corrected, including one case of catheter migration and three cases of omental wrapping, whereas correction failed in the remaining case because of severe bowel adhesion. New catheter placement after adhesiolysis was successful in all three cases of preimplantation peritoneal evaluation (100%). Of the nine patients whose peritonitis episodes were evaluated, two were found to have secondary peritonitis, two had fungal peritonitis; one had tuberculous peritonitis and four had bacterial peritonitis. In the case of persistent exit-site dialysate leakage, laparoscopy showed a penetrating injury of the abdominal wall, raising a strong suspicion of iatrogenic injury during the tunneling maneuvers in initial catheter placement. Two conversions to laparotomy were performed: one to repair the penetrating injury and the other to save the life of a patient threatened by severe fungal peritonitis with abdominal cocoon formation. The laparoscopic procedures lasted 20 to 150 min (average, 50 min). Despite one instance of postoperative hydrocele, there was no operative mortality. CONCLUSIONS The analytical results of this study demonstrate that the current video-assisted laparoscopic technique is an effective means for managing several problems related to peritoneal dialysis such as catheter malfunction, preimplantation evaluation, location of the source of the dialysate leak, and assessment of the causes for peritonitis. Thus, this technique should always be considered when the these problems arise.
Collapse
Affiliation(s)
- S C Jwo
- Division of General Surgery, Chang Gung Memorial Hospital, 222 Mai-Chin Road, Keelung, Taiwan 20442, Republic of China
| | | | | |
Collapse
|
26
|
Chen KS, Wang WC, Chen HM, Lin CF, Hsu HC, Kao JH, Hu MT. Motorcycle emissions and fuel consumption in urban and rural driving conditions. Sci Total Environ 2003; 312:113-122. [PMID: 12873404 DOI: 10.1016/s0048-9697(03)00196-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
This work reports sampling of motorcycle on-road driving cycles in actual urban and rural environments and the development of representative driving cycles using the principle of least total variance in individual regions. Based on the representative driving cycles in individual regions, emission factors for carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NO(x)=NO+NO(2)) and carbon dioxide (CO(2)), as well as fuel consumption, were determined using a chassis dynamometer. The measurement results show that the representative driving cycles are almost identical in the three largest cities in Taiwan, but they differ significantly from the rural driving cycle. Irrespective of driving conditions, emission factors differ insignificantly between the urban and rural regions at a 95% confidence level. However, the fuel consumption in urban centers is approximately 30% higher than in the rural regions, with driving conditions in the former usually poor compared to the latter. Two-stroke motorcycles generally have considerably higher HC emissions and quite lower NO(x) emissions than those of four-stroke motorcycles. Comparisons with other studies suggest that factors such as road characteristics, traffic volume, vehicle type, driving conditions and driver behavior may affect motorcycle emission levels in real traffic situations.
Collapse
Affiliation(s)
- K S Chen
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan, ROC.
| | | | | | | | | | | | | |
Collapse
|
27
|
Ker CG, Chen HY, Chen KS, Jeng IJ, Yang MY, Juan CC, Chen PH, Lo HY, Chai IC, Shih DS, Sheen II. Clinical significance of cell differentiation in hepatocellular carcinoma. Hepatogastroenterology 2003; 50:475-9. [PMID: 12749251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Abstract
BACKGROUND/AIMS Hepatocellular carcinoma is commonly found in Asian countries and prognosis still remains unsatisfactory due to recurrence after surgical tumor resection. METHODOLOGY We try to demonstrate the recurrence and survival time in 99 surgical patients grading by tumor cellular differentiation from surgical specimen. RESULTS The rates of well, moderate, and poor differentiation were encountered in 21 cases (21.2%), 61 cases (61.6%) and 17 cases (17.7%), respectively. Small tumor (< 3 cm) was found in only one (5.9%) in the poor differentiation group and 38.1% and 37.7% in the well and moderate differentiation groups. Capsular invasion was found in 13 (61.9%), 39 (63.9%) and 7 (41.1%) in the well, moderate and poor differentiation group, respectively. We found 41.9% (18/43) and 22.4% (13/58) to be tumor free in capsule invasion (-) and (+) after a period of 18.1 and 29.9 months, respectively. However, the recurrent time was 10.6 and 11.3 months, respectively with no significant difference (p > 0.05). Vascular invasion was more frequent in the poor differentiation group (76.5%) than the well (23.8%) and moderate (60.7%) differentiation groups (P < 0.05). We found 23.5% (4/17) and 35% (21/60) to be tumor free but the recurrence time was 6.5 and 14.1 months for the vascular invasion (-) and (+), respectively. The residual median survival times were 6.5 and 14 months after recurrence, respectively. The tumor recurrence rates were 52.7% (11/21), 52.4% (32/61), and 35.5% (6/17) and recurrence times were 11.7, 11.9, and 4.5 months for the well, moderate and poor differentiation group respectively totally. The recurrence time of young age group (< 39 years old) was shorter than the others and there was no patient of well differentiation less than 40 years old. The recurrence time was shorter in the poor differentiation group but there was no significant difference according to age group. The median survival times were 22.2, 22.9, and 9.5 months for each group, respectively. CONCLUSIONS Differentiation of hepatocellular carcinoma cell had a clinical significance and was found to be positively correlated with the invasive proclivity. The median survival time was longer in both the well and moderate differentiation group, but not in the poor differentiation group. The clinical data revealed that the extended operations performed upon the patients with poor differentiation effected the recurrence time but not the survival time.
Collapse
Affiliation(s)
- C G Ker
- Division of HBP Surgery, Institute of Hepato-Gastroenterology, Yuan's General Hospital, No. 162, Cheng-Kung 1st Rd., Kaohsiung 80211, Taiwan.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Chen KS, Lai CH, Ho YT. Source profiles and ozone formation potentials of volatile organic compounds in three traffic tunnels in Kaohsiung, Taiwan. J Air Waste Manag Assoc 2003; 53:102-112. [PMID: 12568259 DOI: 10.1080/10473289.2003.10466114] [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] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Twenty-five volatile organic compounds (VOCs) up to C10 were measured using Carbotrap multibed thermal adsorption tubes during the morning and afternoon rush hours on four different days in all three traffic tunnels in Kaohsiung, Taiwan. A gas chromatograph (GC) equipped with a flame-ionization detector (FID) was then used to analyze the VOCs. The analytical results show that VOC concentrations increase with traffic flow rate, and emission profiles in the three tunnels are mostly in the range C2-C6. In addition to the traffic conditions and vehicle type, the pattern of emissions in each tunnel was also influenced by other factors, such as vehicle age, nearby pollution sources, and the spatial or temporal variation of VOCs in the urban atmosphere. The ozone formation potential (OFP) in each tunnel was assessed based on the maximum incremental reactivities of the organic species, demonstrating that OFP increases with traffic flow rate. Vehicle distribution influences the contributions of organic group to OFP in a tunnel. Meanwhile, when ranked in descending order of contribution to OFP in all tunnels, the organic groups followed the sequence olefins, aromatics, and paraffins.
Collapse
Affiliation(s)
- K S Chen
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan, Republic of China.
| | | | | |
Collapse
|
29
|
Weiss C, Venkatasubramanian PN, Aguado AS, Power JM, Tom BC, Li L, Chen KS, Disterhoft JF, Wyrwicz AM. Impaired eyeblink conditioning and decreased hippocampal volume in PDAPP V717F mice. Neurobiol Dis 2002; 11:425-33. [PMID: 12586551 DOI: 10.1006/nbdi.2002.0555] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.7] [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: 11/22/2022] Open
Abstract
We examined heterozygous transgenic (Tg) mice that overexpress V717F amyloid precursor protein (APP) for delay eyeblink conditioning (EBC) and hippocampal volume with magnetic resonance imaging (MRI). Platelet-derived APP mice were significantly impaired on EBC relative to wild type (WT) litter-mate controls. T2-weighted spin echo images (62.5 x 125 x 500 microm) of the same mice were acquired under anesthesia using a 9.4T magnet. Tg mice had hippocampal to brain volume ratios that were significantly smaller than WT controls (31% smaller in the rostral dorsal hippocampus, 13-22% smaller among equal dorsal-ventral thirds of a caudal section). These results indicate that overexpression of APP or beta amyloid profoundly affects learning and memory and hippocampal volume. The results also indicate that eyeblink conditioning and quantitative MRI in mice may be useful assays to follow the progression of disease-related changes, and to test the effectiveness of potential therapeutics against Alzheimer's disease.
Collapse
Affiliation(s)
- C Weiss
- Department of Physiology, Institute for Neuroscience, Northwestern University Medical School, Chicago, Illinois 60611, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Chen KS, Chung CY, Wang SW. Measurement and three-dimensional modeling of airflow and pollutant dispersion in an undersea traffic tunnel. J Air Waste Manag Assoc 2002; 52:349-363. [PMID: 11924866 DOI: 10.1080/10473289.2002.10470783] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Airflow and pollutant dispersion in a cross-harbor traffic tunnel were experimentally and numerically studied. Concentrations of the gaseous pollutants CO, NOx, and total hydrocarbons (THC) at three axial locations in the tunnel, together with traffic flow rate, traffic speed, and types of vehicle were measured. Three-dimensional (3D) turbulent flow and dispersion of air pollutants in the tunnel were modeled and solved numerically using the finite volume method. Traffic emissions were modeled accordingly as banded line sources along the tunnel floor. The results reveal that cross-sectional concentrations are nonuniformly distributed and that concentrations rise with downstream distance. The piston effect of vehicles alone can provide 9-23% dilution of air pollutants in the tunnel, compounded to a 23-74% dilution effect according to the ventilation condition.
Collapse
Affiliation(s)
- K S Chen
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan, Republic of China.
| | | | | |
Collapse
|
31
|
Chi H, Tao XM, Yang DX, Chen KS. Simultaneous measurement of axial strain, temperature, and transverse load by a superstructure fiber grating. Opt Lett 2001; 26:1949-51. [PMID: 18059741 DOI: 10.1364/ol.26.001949] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
A novel and simple fiber-optic sensor based on a superstructure fiber grating for simultaneous measurement of temperature, axial strain, and transverse load is proposed and demonstrated. By measurement of the shift and split of broadband and narrow-band loss peaks, one can determine the temperature, axial strain, and transverse load simultaneously over the ranges 0-140 degrees , 0-1200muepsilon, and 0-0.3 kg/mm, respectively.
Collapse
|
32
|
Liburd N, Ghosh M, Riazuddin S, Naz S, Khan S, Ahmed Z, Riazuddin S, Liang Y, Menon PS, Smith T, Smith AC, Chen KS, Lupski JR, Wilcox ER, Potocki L, Friedman TB. Novel mutations of MYO15A associated with profound deafness in consanguineous families and moderately severe hearing loss in a patient with Smith-Magenis syndrome. Hum Genet 2001; 109:535-41. [PMID: 11735029 DOI: 10.1007/s004390100604] [Citation(s) in RCA: 112] [Impact Index Per Article: 4.9] [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] [Received: 07/19/2001] [Accepted: 08/22/2001] [Indexed: 11/30/2022]
Abstract
Mutations in myosin XVA are responsible for the shaker 2 ( sh2) phenotype in mice and nonsyndromic autosomal recessive profound hearing loss DFNB3 on chromosome 17p11.2. We have ascertained seven families with profound congenital hearing loss from Pakistan and India with evidence of linkage to DFNB3 at 17p11.2. We report three novel homozygous mutations in MYO15A segregating in three of these families. In addition, one hemizygous missense mutation of MYO15A was found in one of eight Smith-Magenis syndrome (del(17)p11.2) patients from North America who had moderately severe sensorineural hearing loss.
Collapse
Affiliation(s)
- N Liburd
- Laboratory of Molecular Genetics, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, 5 Research Court, Room 2A-015, Rockville, MD 20850, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Lin SY, Chen KS, Run-Chu L. Design and evaluation of drug-loaded wound dressing having thermoresponsive, adhesive, absorptive and easy peeling properties. Biomaterials 2001; 22:2999-3004. [PMID: 11575474 DOI: 10.1016/s0142-9612(01)00046-1] [Citation(s) in RCA: 120] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
In order to develop a novel unique wound dressing, a combination of self-adhesive Eudragit E film with antibacterial drug-loaded poly (N-isopropyl-acrylamide) (PNIPAAm) microgel beads was designed. The result indicates that the tack property of Eudragit E film increased with an increase of the PNIPAAm microgel beads added, but there was no significant difference between the dried PNIPAAm microgel beads with or without adsorbing drug. In addition, the peel strength of Eudragit E film initially decreased with the addition of PNIPAAm microgel beads, but increased to a maximum value when PNIPAAm microgel beads were added from 4% to 7.6%. then decreased again after 7.6%. The optimal concentration of PNIPAAm microgel beads was 7.6% (w/v) which had better tack and peel adhesive properties. The water uptake ratio of Eudragit E film containing PNIPAAm microgel beads was found to be temperature-dependent, suggesting that the Eudragit E film containing PNIPAAm microgel beads enabled to absorb the wound fluid. Eudragit E film containing PNIPAAm microgel beads with or without adsorbing drug had significantly reduced peel strength after 12 h-immersion in solution. All these results suggest that a novel drug-loaded wound dressing has been developed by binding a self-adhesive Eudragit E film with an antibacterial drug-loaded PNIPAAm microgel beads to achieve thermo-responsive, adhesive, absorptive and easy peeling functions.
Collapse
Affiliation(s)
- S Y Lin
- Department of Medical Research and Education, Veterans General Hospital-Taipei, Shih-Pai, Taiwan, ROC.
| | | | | |
Collapse
|
34
|
Jwo SC, Chen KS, Lee CM, Huang CY. Correction of migrated peritoneal dialysis catheters using lunderquist guidewire: a preliminary report. Perit Dial Int 2001; 21:619-21. [PMID: 11783775] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
Affiliation(s)
- S C Jwo
- Division of General Surgery, Chang Gung Memorial Hospital & Taipei Medical University Hospital, Keelung, Taiwan, ROC.
| | | | | | | |
Collapse
|
35
|
Abstract
In the present study six types of tricalcium phosphate ceramic were prepared and soaked in distilled water for different periods to investigate whether a surface apatite layer was formed on TCP ceramics or not. X-ray diffractometry (XRD) and Fourier-transformed infrared (FTIR) spectrometer were used to examine the changes in crystalline phases and functional groups of TCP ceramics for different soaking periods. Calcium and phosphate ions released from TCP ceramics during soaking were recorded by atomic absorption analysis and ion-coupled plasma. Results revealed that alphaTCP, alphaTCP/betaTCP mixture (alphabetaTCP) and betaTCP ceramic were gradually dissolved. There was no apatite layer formed on their surface after being immersed in distilled water for different durations of time. Mg-TCP ceramic, tricalcium phosphate doped with Mg ions, exhibited a lower dissolution rate than the other types of TCP ceramics. Apatite crystals were also not formed on the surface of Mg-TCP ceramic when immersed in distilled water. Tribasic calcium phosphate, prepared from wet precipitation method, was converted to betaTCP/HAP (HbetaTCP) or alphaTCP/betaTCP/HAP (HalphabetaTCP) crystalline composition at different sintering temperatures (1,150 degrees C and 1,300 degrees C). The surface apatite layer did not appear on HbetaTCP ceramic after soaking. We observed that petal-like apatite was formed on the HalphabetaTCP ceramic surface after being immersed for 2 weeks. alphaTCP phase of HalphabetaTCP ceramic was not directly converted to apatite during soaking. The surface apatite layer formed on the HalphabetaTCP ceramic surface was due to the precipitation of the calcium and phosphate ions released from alphaTCP dissolution. HAP, which existed in the structure of HalphabetaTCP ceramic, plays a role as apatite-precipitating seed to uptake calcium and phosphate ions. TCP ceramics which lacked alphaTCP and HAP content neither converted to apatite nor formed surface apatite on their surfaces during immersion.
Collapse
Affiliation(s)
- F H Lin
- Center of Biomedical Engineering, College of Medicine, National Taiwan University, Taipei
| | | | | | | | | |
Collapse
|
36
|
Roberds SL, Anderson J, Basi G, Bienkowski MJ, Branstetter DG, Chen KS, Freedman SB, Frigon NL, Games D, Hu K, Johnson-Wood K, Kappenman KE, Kawabe TT, Kola I, Kuehn R, Lee M, Liu W, Motter R, Nichols NF, Power M, Robertson DW, Schenk D, Schoor M, Shopp GM, Shuck ME, Sinha S, Svensson KA, Tatsuno G, Tintrup H, Wijsman J, Wright S, McConlogue L. BACE knockout mice are healthy despite lacking the primary beta-secretase activity in brain: implications for Alzheimer's disease therapeutics. Hum Mol Genet 2001; 10:1317-24. [PMID: 11406613 DOI: 10.1093/hmg/10.12.1317] [Citation(s) in RCA: 527] [Impact Index Per Article: 22.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Alzheimer's disease (AD) is a neurodegenerative disorder characterized by accumulation of amyloid plaques and neurofibrillary tangles in the brain. The major components of plaque, beta-amyloid peptides (Abetas), are produced from amyloid precursor protein (APP) by the activity of beta- and gamma-secretases. beta-secretase activity cleaves APP to define the N-terminus of the Abeta1-x peptides and, therefore, has been a long- sought therapeutic target for treatment of AD. The gene encoding a beta-secretase for beta-site APP cleaving enzyme (BACE) was identified recently. However, it was not known whether BACE was the primary beta-secretase in mammalian brain nor whether inhibition of beta-secretase might have effects in mammals that would preclude its utility as a therapeutic target. In the work described herein, we generated two lines of BACE knockout mice and characterized them for pathology, beta-secretase activity and Abeta production. These mice appeared to develop normally and showed no consistent phenotypic differences from their wild-type littermates, including overall normal tissue morphology and brain histochemistry, normal blood and urine chemistries, normal blood-cell composition, and no overt behavioral and neuromuscular effects. Brain and primary cortical cultures from BACE knockout mice showed no detectable beta-secretase activity, and primary cortical cultures from BACE knockout mice produced much less Abeta from APP. The findings that BACE is the primary beta-secretase activity in brain and that loss of beta-secretase activity produces no profound phenotypic defects with a concomitant reduction in beta-amyloid peptide clearly indicate that BACE is an excellent therapeutic target for treatment of AD.
Collapse
Affiliation(s)
- S L Roberds
- Department of Genomics, Pharmacia Corp., 301 Henrietta Street, Kalamazoo, MI 49007, USA.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Abstract
Pyrolysis kinetics of scrap tires of passenger car and truck have been investigated thermogravimetrically under heating rates of 5, 10, 20 and 30K/min and temperature range 373-1273K in nitrogen. The results show that the initial reaction temperatures are 482-521K for the tire of passenger car and 458-511K for truck tire. Both tires exhibit similar behaviors that the initial reaction temperature decreases, but reaction range and reaction rate increase when heating rate is increased. The overall rate equation for each tire can be modeled satisfactorily by a simple one equation from which the kinetic parameters such as the activation energy (E), the pre-exponential factor (A), and the reaction order (n) of unreacted material based on Arrhenius form are determined using Friedman's method. The results show that two tires behave similarly and the average kinetic parameters of two tires are E = 147.95 +/- 0.21kJ/mol, A = (6.295 +/- 1.275)x10(10)min(-1), and n = 1.81 +/- 0.18. The predicted rate equations compare fairly well with the measured data.
Collapse
Affiliation(s)
- J H Chen
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, 106, ROC, Taipei, Taiwan
| | | | | |
Collapse
|
38
|
Chen KS, Hsu WT, Lin YC, Ho YT, Wu CH. Combustion modeling and performance evaluation in a full-scale rotary kiln incinerator. J Air Waste Manag Assoc 2001; 51:885-894. [PMID: 11417680 DOI: 10.1080/10473289.2001.10464311] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This work summarizes the results of numerical investigations and in situ measurements for turbulent combustion in a full-scale rotary kiln incinerator (RKI). The three-dimensional (3D) governing equations for mass, momentum, energy, and species, together with the kappa - epsilon turbulence model, are formulated and solved using a finite volume method. Volatile gases from solid waste were simulated by gaseous CH4 distributed nonuniformly along the kiln bed. The combustion process was considered to be a two-step stoichiometric reaction for primary air mixed with CH4 gas in the combustion chamber. The mixing-controlled eddy-dissipation model (EDM) was employed to predict the conversion rates of CH4, O2, CO2, and CO. The results of the prediction show that reverse flows occur near the entrance of the first combustion chamber (FCC) and the turning point at the entrance to the second combustion chamber (SCC). Temperature and species are nonuniform and are vertically stratified. Meanwhile, additional mixing in the SCC enhances postflame oxidation. A combustion efficiency of up to 99.96% can be achieved at approximately 150% excess air and 20-30% secondary air. Reasonable agreement is achieved between numerical predictions and in situ measurements.
Collapse
Affiliation(s)
- K S Chen
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan, Republic of China.
| | | | | | | | | |
Collapse
|
39
|
Cooper MA, Fehniger TA, Turner SC, Chen KS, Ghaheri BA, Ghayur T, Carson WE, Caligiuri MA. Human natural killer cells: a unique innate immunoregulatory role for the CD56(bright) subset. Blood 2001; 97:3146-51. [PMID: 11342442 DOI: 10.1182/blood.v97.10.3146] [Citation(s) in RCA: 1000] [Impact Index Per Article: 43.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
During the innate immune response to infection, monocyte-derived cytokines (monokines), stimulate natural killer (NK) cells to produce immunoregulatory cytokines that are important to the host's early defense. Human NK cell subsets can be distinguished by CD56 surface density expression (ie, CD56(bright) and CD56(dim)). In this report, it is shown that CD56(bright) NK cells produce significantly greater levels of interferon-gamma, tumor necrosis factor-beta, granulocyte macrophage-colony-stimulating factor, IL-10, and IL-13 protein in response to monokine stimulation than do CD56(dim) NK cells, which produce negligible amounts of these cytokines. Further, qualitative differences in CD56(bright) NK-derived cytokines are shown to be dependent on the specific monokines present. For example, the monokine IL-15 appears to be required for type 2 cytokine production by CD56(bright) NK cells. It is proposed that human CD56(bright) NK cells have a unique functional role in the innate immune response as the primary source of NK cell-derived immunoregulatory cytokines, regulated in part by differential monokine production.
Collapse
MESH Headings
- Antigens, CD/analysis
- CD56 Antigen/analysis
- Cell Division
- Cells, Cultured
- Coculture Techniques
- Cytotoxicity, Immunologic
- Granulocyte-Macrophage Colony-Stimulating Factor/genetics
- Homeostasis
- Humans
- Immunity
- Interferon-gamma/biosynthesis
- Interferon-gamma/genetics
- Interleukin-2/pharmacology
- Interleukins/biosynthesis
- Ionomycin/pharmacology
- Killer Cells, Natural/immunology
- Lectins, C-Type
- Lipopolysaccharides/pharmacology
- Lymphotoxin-alpha/biosynthesis
- Macrophages/metabolism
- Membrane Glycoproteins/analysis
- NK Cell Lectin-Like Receptor Subfamily D
- RNA, Messenger/analysis
- Receptors, IgG/analysis
- Receptors, Immunologic/analysis
- Receptors, Interleukin-2/analysis
- Receptors, Interleukin-2/physiology
- Receptors, KIR
- Tetradecanoylphorbol Acetate/pharmacology
Collapse
Affiliation(s)
- M A Cooper
- Department of Internal Medicine, Division of Hematology/Oncology, The Ohio State University, Columbus, OH, USA
| | | | | | | | | | | | | | | |
Collapse
|
40
|
Chen KS, Lin CF, Chou YM. Determination of source contributions to ambient PM2.5 in Kaohsiung, Taiwan, using a receptor model. J Air Waste Manag Assoc 2001; 51:489-498. [PMID: 11321906 DOI: 10.1080/10473289.2001.10464287] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Ambient particulates of PM2.5 were sampled at three sites in Kaohsiung, Taiwan, during February and March 1999. In addition, resuspended PM2.5 collected from traffic tunnels, paved roads, fly ash of a municipal solid waste (MSW) incinerator, and seawater was obtained. All the samples were analyzed for twenty constituents, including water-soluble ions, organic carbon (OC), elemental carbon (EC), and metallic elements. In conjunction with local source profiles and the source profiles in the model library SPECIATE EPA, the receptor model based on chemical mass balance (CMB) was then applied to determine the source contributions to ambient PM2.5. The mean concentration of ambient PM2.5 was 42.69-53.68 micrograms/m3 for the sampling period. The abundant species in ambient PM2.5 in the mass fraction for three sites were OC (12.7-14.2%), SO4(2-) (12.8-15.1%), NO3- (8.1-10.3%), NH4+ (6.7-7.5%), and EC (5.3-8.5%). Results of CMB modeling show that major pollution sources for ambient PM2.5 are traffic exhaust (18-54%), secondary aerosols (30-41% from SO4(2-) and NO3-), and outdoor burning of agriculture wastes (13-17%).
Collapse
Affiliation(s)
- K S Chen
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan, Republic of China.
| | | | | |
Collapse
|
41
|
Lee SC, Fung CP, Lee N, See LC, Huang JS, Tsai CJ, Chen KS, Shieh WB. Fluconazole disk diffusion test with methylene blue- and glucose-enriched Mueller-Hinton agar for determining susceptibility of Candida species. J Clin Microbiol 2001; 39:1615-7. [PMID: 11283099 PMCID: PMC87982 DOI: 10.1128/jcm.39.4.1615-1617.2001] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A 25-microg fluconazole disk diffusion test using a Mueller-Hinton agar plate containing 2% glucose and 5 microg of methylene blue/ml (GM-MH) was compared to the macrodilution reference method for 210 Candida species. The GM-MH agar plate was read at 24 h. The predictive values of disks with susceptible, intermediate, and resistant results on the GM-MH agar plate at 24 h were 97.1, 56.3, and 76.5%, respectively.
Collapse
Affiliation(s)
- S C Lee
- Division of Infectious Diseases, Chang Gung Memorial Hospital, Keelung, Taipei, Taiwan, Republic of China.
| | | | | | | | | | | | | | | |
Collapse
|
42
|
Liao CJ, Lin FH, Chen KS, Sun JS. Thermal decomposition and reconstruction of hydroxyapatite in air atmosphere. Biomed Sci Instrum 2001; 35:99-104. [PMID: 11143400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
In this paper, the decomposition and reconstruction behavior of hydroxyapatite (HAP) during heating and cooling in air atmosphere were studied. The commercial HAP were chosen and gradually heated to 1500 degrees C and cooled to room temperature by a program controlled SiC heated furnace. X-ray diffractometer (XRD) and Fourier-transformed infrared (FTIR) analysis were used to investigate the change of crystalline phases and functional groups of HAP at different temperatures. Weight change of samples was recorded by thermogravimetric analysis (TGA) during heating and cooling. The results revealed that HAP would gradually release its OH- ions and transform into OHAP in the temperature of 1000-1360 degrees C. Above 1360 degrees C, the OHAP would decompose into TTCP and alpha TCP phase. The OH- stretching bands of HAP could be traced by FTIR even at the temperature of 1350 degrees C which was the eve of HAP decomposition. It reflected that the HAP did not dehydrate completely before decomposed. We speculated that some of OAP might be formed during dehydration and there were a great amount of OHAP still left in the system even up to the temperature of decomposition. In the temperature of 1400-1500 degrees C, there were no significant different in XRD patterns, only TTCP and alpha TCP crystalline phase were observed. When the HAP gradually cooled down from 1500 degrees C, a part of TTCP and alpha TCP would directly reconstruct into oxyapatite (OAP) around 1350 degrees C. OAP existed in the temperature of 1350 to 1300 degrees C during cooling. When the temperature down to 1290 degrees C, a part of TTCP and alpha TCP reconstructed into OHAP by rehydration reaction and OAP were rehydrated into OHAP as well. At 1100 degrees C, the rest of TTCP and alpha TCP would reconstitute into HAP. As the temperature decreased, the OHAP were gradually rehydrated and reconstituted into HAP.
Collapse
Affiliation(s)
- C J Liao
- Institute of Biomedical Engineering, College of Medicine, National Taiwan University, Taipei, Taiwan
| | | | | | | |
Collapse
|
43
|
Chen G, Chen KS, Knox J, Inglis J, Bernard A, Martin SJ, Justice A, McConlogue L, Games D, Freedman SB, Morris RG. A learning deficit related to age and beta-amyloid plaques in a mouse model of Alzheimer's disease. Nature 2000; 408:975-9. [PMID: 11140684 DOI: 10.1038/35050103] [Citation(s) in RCA: 404] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Mice that overexpress the human mutant amyloid precursor protein (hAPP) show learning deficits, but the apparent lack of a relationship between these deficits and the progressive beta-amyloid plaque formation that the hAPP mice display is puzzling. In the water maze, hAPP mice are impaired before and after amyloid plaque deposition. Here we show, using a new water-maze training protocol, that PDAPP mice also exhibit a separate age-related deficit in learning a series of spatial locations. This impairment correlates with beta-amyloid plaque burden and is shown in both cross-sectional and longitudinal experimental designs. Cued navigation and object-recognition memory are normal. These findings indicate that A beta overexpression and/or A beta plaques are associated with disturbed cognitive function and, importantly, suggest that some but not all forms of learning and memory are suitable behavioural assays of the progressive cognitive deficits associated with Alzheimer's-disease-type pathologies.
Collapse
Affiliation(s)
- G Chen
- Department of Neuroscience, University of Edinburgh, UK
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Abstract
Although venous thrombosis is a frequently encountered problem in nephrotic syndrome, the occurrence of arterial thrombosis is much less common, and is usually associated with a poor prognosis. To the best of our knowledge, there has been only one reported case of concurrent cerebral and femoral artery thrombosis, that of a 23-year-old male who finally died. Herein, we report a case of a 35-year-old woman with nephrotic syndrome. She developed cerebral and femoral arterial thrombosis simultaneously when the nephrotic syndrome relapsed. Immediate thrombectomy of the femoral artery, followed by anticoagulation and immunosuppressive therapy, were employed. The patient recovered completely and is now doing well. Our experience indicates that multiple artery thrombosis in nephrotic patients may not necessarily carry a poor outcome if early and aggressive treatment can be undertaken.
Collapse
Affiliation(s)
- C H Lee
- Division of Nephrology, Keelung Branch, Chung Gung Memorial Hospital, Keelung, Taiwan
| | | | | | | | | |
Collapse
|
45
|
Lee SC, Fung CP, Huang JS, Tsai CJ, Chen KS, Chen HY, Lee N, See LC, Shieh WB. Clinical correlates of antifungal macrodilution susceptibility test results for non-AIDS patients with severe Candida infections treated with fluconazole. Antimicrob Agents Chemother 2000; 44:2715-8. [PMID: 10991850 PMCID: PMC90141 DOI: 10.1128/aac.44.10.2715-2718.2000] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Although the clinical correlates of the reference antifungal susceptibility test results in hematogenous and deep-seated Candida infection are still controversial, we evaluated the clinical correlates of this test in deep-seated Candida infections in non-AIDS patients. Thirty-two non-AIDS patients with hematogenous or deep-seated Candida infections were treated with intravenous fluconazole (400 mg a day), and the clinical outcomes were evaluated. Coexisting bacterial infections were treated with appropriate antibiotics, superinfection or reinfection was excluded, inadequate fluconazole therapy was avoided, and essential surgical intervention was performed. The MICs of fluconazole for these 32 Candida isolates were determined according to the M27-A procedure approved by the National Committee on Clinical Laboratory Standards. MICs were interpreted as susceptible (< or =8 microg/ml), dose-dependent susceptible (16 to 32 microg/ml), and resistant (> or =64 microg/ml) according to the criteria of the M27-A standard. The success rates were 79% (19 of 24; 95% confidence interval [CI], 59 to 93%) in the susceptible category, 66% (4 of 6; 95% CI, 19 to 95%) in the dose-dependent susceptible category, and 0% (0 of 2; 95% CI, 0 to 84%) in the resistant category. We conclude that the clinical correlation of the reference antifungal susceptibility test results is high in hematogenous and deep-seated Candida infections.
Collapse
Affiliation(s)
- S C Lee
- Division of Infectious Diseases, Chang Gung Memorial Hospital, Keelung, Taipei, Taiwan, Republic of China
| | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Kao HH, Chen KS, Tsai CJ, Lee CC, Chang HY. Clinical characteristic of parenteral iron supplementation in hemodialysis patients receiving erythropoietin therapy. Chang Gung Med J 2000; 23:608-13. [PMID: 11126152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
BACKGROUND Iron deficiency constitutes the major cause of erythropoietin hyporesponse in uremic patients receiving erythropoietin therapy; therefore, iron supplementation is necessary for these patients. Recent data suggested that intravenous iron supply is a preferable route for iron supplementation. However, it remains unclear whether a single large dose or multiple small doses are a better way of administering an intravenous iron supply. METHODS To determine the effect of different dosing schedules of intravenous iron therapy on the hematocrit level, we randomly assigned 18 patients to 3 groups. The first group of patients (n = 6) received a single dose of 800 mg intravenous fesin (ferric saccharate). The second group of patients (n = 6) received 400 mg intravenous fesin once weekly for 2 successive weeks. The third group of patients (n = 6) received 120 mg of intravenous fesin for 7 successive hemodialysis sessions. EPO was given at a fixed dose for all individuals in the study period. RESULTS The results showed that all 3 groups of patients had a progressive increase in hematocrit (Hct) level following intravenous iron therapy. Serum ferritin levels increased rapidly following iron therapy and then declined gradually in all 3 groups. But no statistical significance could be found among the 3 groups because of the small patient number. Also, no differences were observed in Hct or serum ferritin levels among these 3 groups of patients at all stages. CONCLUSION In this study, we found that a large single dose as well as small multiple doses of parenteral iron therapy had similar effects in correcting the iron deficiency in hemodialysis patients treated with erythropoietin. To save manpower and costs, we recommend the large single dosing schedule.
Collapse
Affiliation(s)
- H H Kao
- Division of Nephrology, Department of Internal Medicine, Chang Gung Memorial Hospital, 222 Mai-Chin Road, Keelung, Taiwan, R.O.C
| | | | | | | | | |
Collapse
|
47
|
Lin SY, Chen KS, Run-Chu L. Organic esters of plasticizers affecting the water absorption, adhesive property, glass transition temperature and plasticizer permanence of eudragit acrylic films. J Control Release 2000; 68:343-50. [PMID: 10974388 DOI: 10.1016/s0168-3659(00)00259-5] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The materials used in film coating technology are very important tools for pharmaceutical applications. The effects of four organic esters used as plasticizers (triacetin, diethyl phthalate (DEP), dibutyl phthalate (DBP) and tributyl citrate (TBC)) on the water absorption behavior and adhesive property of Eudragit films and on the glass transition temperature (T(g)) and plasticizer permanence of Eudragit E film were investigated. The results indicate that the water absorption of these Eudragit films was dependent on the type of Eudragit polymers and plasticizers used. Eudragit E film plasticized with triacetin showed a slight water absorption, but when plasticized with DEP, DBP or TBC did not. All Eudragit RL films showed significant uptake of water, but Eudragit RS films exhibited a lesser degree of water absorption. The adhesion (tack value) of all Eudragit films was markedly increased when the concentration of plasticizer was greater than 25%. Eudragit E film exhibited a greater adhesiveness than the Eudragit RL or RS film, particularly with higher plasticizer concentration. Weight loss of the Eudragit E film plasticized with triacetin or DEP was more pronounced with aging, but when plasticized with DBP or TBC weight loss was not seen. The results indicate that TBC may be the best choice of plasticizer for Eudragit film, particularly for the Eudragit E film.
Collapse
Affiliation(s)
- S Y Lin
- Department of Medical Research and Education, Veterans General Hospital-Taipei, Taipei, PR China.
| | | | | |
Collapse
|
48
|
Chuang IC, Chen KS, Huang YL, Lee PN, Lin TH. Determination of trace elements in some natural drugs by atomic absorption spectrometry. Biol Trace Elem Res 2000; 76:235-44. [PMID: 11049222 DOI: 10.1385/bter:76:3:235] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/1999] [Revised: 11/22/1999] [Accepted: 12/20/1999] [Indexed: 11/11/2022]
Abstract
Fifteen kinds of common plants, animals, and minerals used as traditional medicines by the Chinese people have been subjected to analysis by atomic absorption spectrometry for its content of seven metals: lead, cadmium, arsenic, mercury, copper, cobalt, and manganese. The concentrations of these elements are significantly different according to their vegetal, animal, or mineral origin. The average values found for lead, cadmium, arsenic, cobalt, and manganese in drugs of mineral origin are higher than those derived from plants and animals, except for copper, which was higher in drugs of animal origin. Our results suggest that the user of traditional Chinese crude drugs should be warned of the potential danger of heavy-metal poisoning because their concentrations seem to be higher than the maximum values allowed by health agencies in several countries.
Collapse
Affiliation(s)
- I C Chuang
- Graduate Institute of Medicine and School of Technology for Medical Sciences, Kaohsiung Medical University, Taiwan, Republic of China
| | | | | | | | | |
Collapse
|
49
|
Lin SY, Chen KS, Teng HH, Li MJ. In vitro degradation and dissolution behaviours of microspheres prepared by three low molecular weight polyesters. J Microencapsul 2000; 17:577-86. [PMID: 11038117 DOI: 10.1080/026520400417630] [Citation(s) in RCA: 45] [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] [Indexed: 10/16/2022]
Abstract
Three low-molecular weight polyesters, poly(L-lactic acid) (PLA), copoly(lactic acid/glycolic acid) (PLGA) and poly(delta-valerolactone) (PV), were used to prepare water-soluble sodium diclofenac-loaded microspheres by using the oil-in-oil (o/o) emulsification-solvent evaporation method. Their micromeritic and physicochemical properties, and degradation and dissolution behaviours were determined in vitro. The results indicate that high encapsulation efficiency and better monodispersity might be achieved by the o/o emulsification-solvent evaporation method, depending on the amount of drug loading used. The slower evaporation of organic solvent from the system during microencapsulation seemed to modify the crystallinity of drug and polyester in the microspheres, determined by powder x-ray diffractometry and differential scanning calorimetry. The in vitro degradation rate of all the microspheres in pH7.4 phosphate buffer solution showed first-order kinetics and ranked in the order of PLGA > PLA > PV microspheres. Furthermore, the first-order release rate was also found in all the microspheres after an initial drug burst and ranked in the order of PLGA> PLA > PV microspheres, too. The relationship between degradation and dissolution behaviours of these microspheres is discussed.
Collapse
Affiliation(s)
- S Y Lin
- Department of Medical Research and Education, Veterans General Hospital-Taipei, Taiwan, Republic of China.
| | | | | | | |
Collapse
|
50
|
Lin FH, Liao CJ, Chen KS, Sun JS, Lin CY. Preparation of betaTCP/HAP biphasic ceramics with natural bone structure by heating bovine cancellous bone with the addition of (NH(4))(2)HPO(4). J Biomed Mater Res 2000; 51:157-63. [PMID: 10825214 DOI: 10.1002/(sici)1097-4636(200008)51:2<157::aid-jbm3>3.0.co;2-r] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In this study, the calcined bovine bone (CBB)-removing the organic substance by a burning process-with addition of different quantities of ammonium phosphate [(NH(4))(2)HPO(4)] (AP) was heated to a high temperature to transform its crystalline phase constitution from hydroxyapatite (HAP) into a tricalcium phosphate (TCP)/HAP biphasic structure. Results revealed that the CBB without AP appeared to be mainly composed of an HAP type pattern when heated to 1300 degrees C. After adding doped AP to CBB, the HPO(4)(2-) ions of AP condensed into P(2)O(7)(4-) ions at temperatures of 400-600 degrees C. P(2)O(7)(4-) ions reacted with the OH(-) ions of HAP to form betaTCP at temperatures up to 600 degrees C. The conversion reaction of HAP to betaTCP finished at around 900 degrees C. With increasing AP in the CBB, HAP gradually converted into different phase compositions of TCP/HAP or TCP at high temperature. Mechanical testing results showed that there was no significant difference in sintered CBB with different quantities of AP. By heating calcined bovine cancellous bone with different quantities of AP, we obtained different crystalline phase compositions of bioceramics with a natural porous structure.
Collapse
Affiliation(s)
- F H Lin
- Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan
| | | | | | | | | |
Collapse
|