| Records |
| Author |
Heffernan, J.M.; McNamara, J.B.; Borwege, S.; Vernon, B.L.; Sanai, N.; Mehta, S.; Sirianni, R.W. |
| Title |
PNIPAAm-co-Jeffamine(R) (PNJ) scaffolds as in vitro models for niche enrichment of glioblastoma stem-like cells |
Type |
Journal Article |
| Year |
2017 |
Publication |
Biomaterials |
Abbreviated Journal  |
Biomaterials |
| Volume |
143 |
Issue |
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Pages |
149-158 |
| Keywords |
Brain tumor initiating cells; Cancer stem cells; Radioresistance; Temperature responsive polymer scaffolds; Tissue engineering |
| Abstract |
Glioblastoma (GBM) is the most common adult primary brain tumor, and the 5-year survival rate is less than 5%. GBM malignancy is driven in part by a population of GBM stem-like cells (GSCs) that exhibit indefinite self-renewal capacity, multipotent differentiation, expression of neural stem cell markers, and resistance to conventional treatments. GSCs are enriched in specialized niche microenvironments that regulate stem phenotypes and support GSC radioresistance. Therefore, identifying GSC-niche interactions that regulate stem phenotypes may present a unique target for disrupting the maintenance and persistence of this treatment resistant population. In this work, we engineered 3D scaffolds from temperature responsive poly(N-isopropylacrylamide-co-Jeffamine M-1000(R) acrylamide), or PNJ copolymers, as a platform for enriching stem-specific phenotypes in two molecularly distinct human patient-derived GSC cell lines. Notably, we observed that, compared to conventional neurosphere cultures, PNJ cultured GSCs maintained multipotency and exhibited enhanced self-renewal capacity. Concurrent increases in expression of proteins known to regulate self-renewal, invasion, and stem maintenance in GSCs (NESTIN, EGFR, CD44) suggest that PNJ scaffolds effectively enrich the GSC population. We further observed that PNJ cultured GSCs exhibited increased resistance to radiation treatment compared to GSCs cultured in standard neurosphere conditions. GSC radioresistance is supported in vivo by niche microenvironments, and this remains a significant barrier to effectively treating these highly tumorigenic cells. Taken in sum, these data indicate that the microenvironment created by synthetic PNJ scaffolds models niche enrichment of GSCs in patient-derived GBM cell lines, and presents tissue engineering opportunities for studying clinically important behaviors such as radioresistance in vitro. |
| Address |
Barrow Brain Tumor Research Center, Barrow Neurological Institute, 350 W Thomas Ave, Phoenix, AZ, 85013, USA; School of Biological and Health Systems Engineering, Arizona State University, PO Box 879709, Tempe, AZ, 85287, USA. Electronic address: rachael.sirianni@dignityhealth.org |
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| Language |
English |
Summary Language |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0142-9612 |
ISBN |
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| Notes |
PMID:28802102 |
Approved |
no |
| Call Number |
ref @ user @ |
Serial |
96570 |
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| Author |
Jimenez, M.M.; Arias, J.; Carrasquilla, G. |
| Title |
Seroprevalence of dengue infection in the municipalities of Armenia, Calarca, La Tebaida and Montenegro in Quindio, 2014 |
Type |
Journal Article |
| Year |
2017 |
Publication |
Biomedica : Revista del Instituto Nacional de Salud |
Abbreviated Journal |
Biomedica |
| Volume |
37 |
Issue |
1 |
Pages |
34-41 |
| Keywords |
Dengue/epidemiology; immunoglobulin G; immunoglobulin M; prevalence; public health, Colombia |
| Abstract |
INTRODUCTION: Dengue is a serious public health problem in Colombia; it is prevalent in 90% of the municipalities in Quindio. Studies on its seroprevalence are required to address public health interventions. OBJECTIVE: To establish the seroprevalence of dengue infection in neighborhoods with high incidence in the municipalities of Armenia, Calarca, La Tebaida and Montenegro, Quindio, in 2014. MATERIALS AND METHODS: We conducted a probabilistic, stratified, two-stage prevalence study. We interviewed 658 residents in the urban area of the selected municipalities. After they signed the informed consent, we took a blood sample to determine dengue IgG and IgM antibodies. RESULTS: Seroprevalence of IgG in Quindio was 89,4%; in Armenia it was 88,7%, in Calarca, 81,5%, in Montenegro, 91,8% and in La Tebaida 97,8%. IgM was 14, 2% in Quindio; in Armenia it was 11,5%, in Calarca, 13,0%, in Montenegro, 13,1% and in La Tebaida, 28,9%. CONCLUSIONS: We found a high prevalence of both IgG and IgM in the four municipalities. We had positive results for IgM in all age groups, which suggests recent infection. We also found simultaneous seropositivity for IgG and IgM (12.9%), which may indicate infection by another serotype or presence of infection in the past three months. A multisectoral approach is necessary for dengue control in Quindio. |
| Address |
Eje de Salud Publica, Fundacion Santa Fe de Bogota, Bogota, D.C., Colombia. monica.jimenez@fsfb.org.co |
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English |
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Edition |
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0120-4157 |
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| Notes |
PMID:28527246 |
Approved |
no |
| Call Number |
ref @ user @ |
Serial |
97637 |
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| Author |
Jensen, S.S.; Petterson, S.A.; Halle, B.; Aaberg-Jessen, C.; Kristensen, B.W. |
| Title |
Effects of the lysosomal destabilizing drug siramesine on glioblastoma in vitro and in vivo |
Type |
Journal Article |
| Year |
2017 |
Publication |
BMC Cancer |
Abbreviated Journal |
BMC Cancer |
| Volume |
17 |
Issue |
1 |
Pages |
178 |
| Keywords |
Brain slice cultures; Cancer stem cell; Glioblastoma; Lysosomes; Siramesine; Spheroids |
| Abstract |
BACKGROUND: Glioblastoma is the most frequent and most malignant brain tumor with the patients having a median survival of only 14.6 months. Although glioblastoma patients are treated with surgery, radiation and chemotherapy recurrence is inevitable. A stem-like population of radio- and chemoresistant brain tumor-initiating cells combined with the invasive properties of the tumors is believed to be critical for treatment resistance. In the present study, the aim was to investigate the effect of a novel therapeutic strategy using the lysosomotropic detergent siramesine on glioblastomas. METHODS: Standard glioma cell lines and patient-derived spheroids cultures with tumor-initiating stem-like cells were used to investigate effects of siramesine on proliferation and cell death. Responsible mechanisms were investigated by inhibitors of caspases and cathepsins. Effects of siramesine on migrating tumor cells were investigated by a flat surface migration assay and by implanting spheroids into organotypic rat brain slice cultures followed by confocal time-lapse imaging. Finally the effect of siramesine was investigated in an orthotopic mouse glioblastoma model. Results obtained in vitro and in vivo were confirmed by immunohistochemical staining of histological sections of spheroids, spheroids in brain slice cultures and tumors in mice brains. RESULTS: The results showed that siramesine killed standard glioma cell lines in vitro, and loss of acridine orange staining suggested a compromised lysosomal membrane. Co-treatment of the cell lines with inhibitors of caspases and cathepsins suggested differential involvement in cell death. Siramesine caused tumor cell death and reduced secondary spheroid formation of patient-derived spheroid cultures. In the flat surface migration model siramesine caused tumor cell death and inhibited tumor cell migration. This could not be reproduced in the organotypic three dimensional spheroid-brain slice culture model or in the mice xenograft model. CONCLUSIONS: In conclusion the in vitro results obtained with tumor cells and spheroids suggest a potential of lysosomal destabilizing drugs in killing glioblastoma cells, but siramesine was without effect in the organotypic spheroid-brain slice culture model and the in vivo xenograft model. |
| Address |
Institute of Clinical Research, University of Southern Denmark, Winslowparken 19.3, 5000, Odense C, Denmark. bjarne.winther.kristensen@rsyd.dk |
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English |
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Edition |
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1471-2407 |
ISBN |
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| Notes |
PMID:28270132 |
Approved |
no |
| Call Number |
ref @ user @ |
Serial |
96603 |
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| Author |
Gersey, Z.C.; Rodriguez, G.A.; Barbarite, E.; Sanchez, A.; Walters, W.M.; Ohaeto, K.C.; Komotar, R.J.; Graham, R.M. |
| Title |
Curcumin decreases malignant characteristics of glioblastoma stem cells via induction of reactive oxygen species |
Type |
Journal Article |
| Year |
2017 |
Publication |
BMC Cancer |
Abbreviated Journal |
BMC Cancer |
| Volume |
17 |
Issue |
1 |
Pages |
99 |
| Keywords |
Acetylcysteine/pharmacology; Adult; Antineoplastic Agents/*pharmacology; Cell Proliferation/drug effects; Cell Survival/drug effects; Curcumin/*pharmacology; Drug Resistance, Neoplasm; Drug Screening Assays, Antitumor; Free Radical Scavengers; Glioblastoma/drug therapy/pathology; Humans; Inhibitor of Apoptosis Proteins/metabolism; Inhibitory Concentration 50; Mitogen-Activated Protein Kinases/metabolism; Neoplastic Stem Cells/*drug effects; Oxidative Stress; Reactive Oxygen Species/*metabolism; STAT3 Transcription Factor/metabolism; Tumor Cells, Cultured; Brain tumor; Curcumin; Glioblastoma; Natural product; Reactive oxygen species; Stat3; Stem cell |
| Abstract |
BACKGROUND: Glioblastoma Multiforme (GBM) is the most common and lethal form of primary brain tumor in adults. Following standard treatment of surgery, radiation and chemotherapy, patients are expected to survive 12-14 months. Theorized cause of disease recurrence in these patients is tumor cell repopulation through the proliferation of treatment-resistant cancer stem cells. Current research has revealed curcumin, the principal ingredient in turmeric, can modulate multiple signaling pathways important for cancer stem cell self-renewal and survival. METHODS: Following resection, tumor specimens were dissociated and glioblastoma stem cells (GSCs) were propagated in neurosphere media and characterized via immunocytochemistry. Cell viability was determined with MTS assay. GSC proliferation, sphere forming and colony forming assays were conducted through standard counting methods. Reactive oxygen species (ROS) production was examined using the fluorescent molecular probe CM-H2DCFA. Effects on cell signaling pathways were elucidated by western blot. RESULTS: We evaluate the effects of curcumin on patient-derived GSC lines. We demonstrate a curcumin-induced dose-dependent decrease in GSC viability with an approximate IC50 of 25 muM. Treatment with sub-toxic levels (2.5 muM) of curcumin significantly decreased GSC proliferation, sphere forming ability and colony forming potential. Curcumin induced ROS, promoted MAPK pathway activation, downregulated STAT3 activity and IAP family members. Inhibition of ROS with the antioxidant N-acetylcysteine reversed these effects indicating a ROS dependent mechanism. CONCLUSIONS: Discoveries made in this investigation may lead to a non-toxic intervention designed to prevent recurrence in glioblastoma by targeting glioblastoma stem cells. |
| Address |
Department of Neurological Surgery, University of Miami Brain Tumor Initiative (UMBTI) Research Laboratory, Lois Pope LIFE Center, 2nd Floor, 1095 NW 14th Terrace, Miami, Florida, 33136, USA. rgraham@med.miami.edu |
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English |
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1471-2407 |
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| Notes |
PMID:28160777 |
Approved |
no |
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ref @ user @ |
Serial |
96610 |
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| Author |
Meng, X.; Liu, S.; Duan, J.; Huang, X.; Zhou, P.; Xiong, X.; Gong, R.; Zhang, Y.; Liu, Y.; Fu, C.; Li, C.; Wu, A. |
| Title |
Risk factors and medical costs for healthcare-associated carbapenem-resistant Escherichia coli infection among hospitalized patients in a Chinese teaching hospital |
Type |
Journal Article |
| Year |
2017 |
Publication |
BMC Infectious Diseases |
Abbreviated Journal |
BMC Infect Dis |
| Volume |
17 |
Issue |
1 |
Pages |
82 |
| Keywords |
Adolescent; Adult; Aged; Aged, 80 and over; Anti-Bacterial Agents/economics/therapeutic use; Anti-Infective Agents; *Carbapenems; Case-Control Studies; Catheterization, Central Venous/statistics & numerical data; Child; Child, Preschool; China/epidemiology; Cross Infection/drug therapy/economics/*epidemiology/microbiology; Drug Costs; *Drug Resistance, Bacterial; Escherichia coli Infections/drug therapy/economics/*epidemiology/microbiology; Female; Health Care Costs; Hemoglobins; Hospitals, Teaching; Humans; Hyperglycemia/epidemiology; Incidence; Infant; Infant, Newborn; Length of Stay/*statistics & numerical data; Logistic Models; Male; Middle Aged; Multivariate Analysis; Retrospective Studies; Risk Factors; Tertiary Care Centers; Tracheostomy/statistics & numerical data; Urologic Diseases/epidemiology; Young Adult; Crec; Csec; Healthcare-associated infection; Risk factors |
| Abstract |
BACKGROUND: The emergence and spread of Carbapenem-resistant Escherichia coli (CREC) is becoming a serious problem in Chinese hospitals, however, the data on this is scarce. Therefore, we investigate the risk factors for healthcare-associated CREC infection and study the incidence, antibiotic resistance and medical costs of CREC infections in our hospital. METHODS: We conducted a retrospective, matched case-control-control, parallel study in a tertiary teaching hospital. Patients admitted between January 2012 and December 2015 were included in this study. For patients with healthcare-associated CREC infection, two matched subject groups were created; one group with healthcare-associated CSEC infection and the other group without infection. RESULTS: Multivariate conditional logistic regression analysis demonstrated that prior hospital stay (<6 months) (OR:3.96; 95%CI:1.26-12.42), tracheostomy (OR:2.24; 95%CI: 1.14-4.38), central venous catheter insertion (OR: 8.15; 95%CI: 2.31-28.72), carbapenem exposure (OR: 12.02; 95%CI: 1.52-95.4), urinary system disease (OR: 16.69; 95%CI: 3.01-89.76), low hemoglobin (OR: 2.83; 95%CI: 1.46-5.50), and high blood glucose are associated (OR: 7.01; 95%CI: 1.89-26.02) with CREC infection. Total costs (p = 0.00), medical examination costs (p = 0.00), medical test costs (p = 0.00), total drug costs (p = 0.00) and ant-infective drug costs (p = 0.00) for the CREC group were significantly higher than those for the no infection group. Medical examination costs (p = 0.03), total drug costs (p = 0.03), and anti-infective drug costs (p = 0.01) for the CREC group were significantly higher than for the CSEC group. Mortality in CREC group was significantly higher than the CSEC group (p = 0.01) and no infection group (p = 0.01). CONCLUSION: Many factors were discovered for acquisition of healthcare-associated CREC infection. CREC isolates were resistant to most antibiotics, and had some association with high financial burden and increased mortality. |
| Address |
Infection Control Centre, Xiangya Hospital of Central South University, Changsha, China. xywuanhua@csu.edu.cn |
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English |
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Edition |
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1471-2334 |
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| Notes |
PMID:28095785 |
Approved |
no |
| Call Number |
ref @ user @ |
Serial |
99123 |
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