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  1. Article ; Online: Two High Throughput Screen Assays for Measurement of TNF-α in THP-1 Cells.

    Leister, Kristin P / Huang, Ruili / Goodwin, Bonnie L / Chen, Andrew / Austin, Christopher P / Xia, Menghang

    Current chemical genomics

    2011  Volume 5, Page(s) 21–29

    Abstract: Tumor Necrosis Factor-α (TNF-α), a secreted cytokine, plays an important role in inflammatory diseases and immune disorders, and is a potential target for drug development. The traditional assays for detecting TNF-α, enzyme linked immunosorbent assay ( ... ...

    Abstract Tumor Necrosis Factor-α (TNF-α), a secreted cytokine, plays an important role in inflammatory diseases and immune disorders, and is a potential target for drug development. The traditional assays for detecting TNF-α, enzyme linked immunosorbent assay (ELISA) and radioimmunoassay, are not suitable for the large size compound screens. Both assays suffer from a complicated protocol, multiple plate wash steps and/or excessive radioactive waste. A simple and quick measurement of TNF-α production in a cell based assay is needed for high throughput screening to identify the lead compounds from the compound library. We have developed and optimized two homogeneous TNF-α assays using the HTRF (homogeneous time resolved fluorescence) and AlphaLISA assay formats. We have validated the HTRF based TNF-α assay in a 1536-well plate format by screening a library of 1280 pharmacologically active compounds. The active compounds identified from the screen were confirmed in the AlphaLISA TNF-α assay using a bead-based technology. These compounds were also confirmed in a traditional ELISA assay. From this study, several beta adrenergic agonists have been identified as TNF-α inhibitors. We also identified several novel inhibitors of TNF-α, such as BTO-1, CCG-2046, ellipticine, and PD 169316. The results demonstrated that both homogeneous TNF-α assays are robust and suitable for high throughput screening.
    Language English
    Publishing date 2011-05-10
    Publishing country United Arab Emirates
    Document type Journal Article
    ZDB-ID 2413563-X
    ISSN 1875-3973 ; 1875-3973
    ISSN (online) 1875-3973
    ISSN 1875-3973
    DOI 10.2174/1875397301105010021
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Argininosuccinate synthase expression is required to maintain nitric oxide production and cell viability in aortic endothelial cells.

    Goodwin, Bonnie L / Solomonson, Larry P / Eichler, Duane C

    The Journal of biological chemistry

    2004  Volume 279, Issue 18, Page(s) 18353–18360

    Abstract: Although cellular levels of arginine greatly exceed the apparent K(m) for endothelial nitric-oxide synthase, current evidence suggests that the bulk of this arginine may not be available for nitric oxide (NO) production. We propose that arginine ... ...

    Abstract Although cellular levels of arginine greatly exceed the apparent K(m) for endothelial nitric-oxide synthase, current evidence suggests that the bulk of this arginine may not be available for nitric oxide (NO) production. We propose that arginine regeneration, that is the recycling of citrulline back to arginine, defines the essential source of arginine for NO production. To support this proposal, RNA interference analysis was used to selectively reduce the expression of argininosuccinate synthase (AS), because the only known metabolic role for AS in endothelial cells is in the regeneration of l-arginine from l-citrulline. Western blot analysis demonstrated a significant and dose-dependent reduction of AS protein as a result of AS small interfering RNA treatment with a corresponding diminished capacity to produce basal or stimulated levels of NO, despite saturating levels of arginine in the medium. Unanticipated, however, was the finding that the viability of AS small interfering RNA-treated endothelial cells was significantly decreased when compared with control cells. Trypan blue exclusion analysis suggested that the loss of viability was not because of necrosis. Two indicators, reduced expression of Bcl-2 and an increase in caspase activity, which correlated directly with reduced expression of AS, suggested that the loss of viability was because of apoptosis. The exposure of cells to an NO donor prevented apoptosis associated with reduced AS expression. Overall, these results demonstrate the essential role of AS for endothelial NO production and cell viability.
    MeSH term(s) Animals ; Aorta ; Apoptosis ; Arginine/metabolism ; Argininosuccinate Synthase/biosynthesis ; Argininosuccinate Synthase/physiology ; Cattle ; Cell Survival ; Citrulline/metabolism ; Endothelium, Vascular/cytology ; Gene Silencing ; Nitric Oxide/biosynthesis ; Proto-Oncogene Proteins c-bcl-2/analysis ; RNA, Small Interfering/pharmacology
    Chemical Substances Proto-Oncogene Proteins c-bcl-2 ; RNA, Small Interfering ; Citrulline (29VT07BGDA) ; Nitric Oxide (31C4KY9ESH) ; Arginine (94ZLA3W45F) ; Argininosuccinate Synthase (EC 6.3.4.5)
    Language English
    Publishing date 2004-02-16
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1074/jbc.M308160200
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Regulation of endothelial argininosuccinate synthase expression and NO production by an upstream open reading frame.

    Pendleton, Laura C / Goodwin, Bonnie L / Solomonson, Larry P / Eichler, Duane C

    The Journal of biological chemistry

    2005  Volume 280, Issue 25, Page(s) 24252–24260

    Abstract: Argininosuccinate synthase (AS) catalyzes the rate-limiting step in the recycling of citrulline to arginine, which in endothelial cells, is tightly coupled to the production of nitric oxide (NO). In previous work, we established that endothelial AS mRNA ... ...

    Abstract Argininosuccinate synthase (AS) catalyzes the rate-limiting step in the recycling of citrulline to arginine, which in endothelial cells, is tightly coupled to the production of nitric oxide (NO). In previous work, we established that endothelial AS mRNA can be initiated from multiple start sites, generating co-expressed mRNA variants with different 5'-untranslated regions (5'-UTRs). One of the 5'-UTRs, the shortest form, represents greater than 90% of the total AS mRNA. Two other extended 5'-UTR forms of AS mRNA, resulting from upstream initiations, contain an out-of-frame, upstream open reading frame (uORF). In this study, the function of the extended 5'-UTRs of AS mRNA was investigated. Single base insertions to place the uORF in-frame, and mutations to extend the uORF, demonstrated functionality, both in vitro with AS constructs and in vivo with luciferase constructs. Overexpression of the uORF suppressed endothelial AS protein expression, whereas specific silencing of the uORF AS mRNAs resulted in the coordinate up-regulation of AS protein and NO production. Expression of the full-length of the uORF was necessary to mediate a trans-suppressive effect on endothelial AS expression, demonstrating that the translation product itself affects regulation. In conclusion, the uORF found in the extended, overlapping 5'-UTR AS mRNA species suppresses endothelial AS expression, providing a novel mechanism for regulating endothelial NO production by limiting the availability of arginine.
    MeSH term(s) 5' Untranslated Regions ; Animals ; Argininosuccinate Synthase/genetics ; Argininosuccinate Synthase/metabolism ; Base Sequence ; Cattle ; Cells, Cultured ; Endothelium, Vascular/cytology ; Endothelium, Vascular/enzymology ; Luciferases/genetics ; Molecular Sequence Data ; Mutagenesis ; Nitric Oxide/biosynthesis ; Open Reading Frames ; Protein Biosynthesis ; RNA, Messenger/genetics ; Transcription, Genetic
    Chemical Substances 5' Untranslated Regions ; RNA, Messenger ; Nitric Oxide (31C4KY9ESH) ; Luciferases (EC 1.13.12.-) ; Argininosuccinate Synthase (EC 6.3.4.5)
    Language English
    Publishing date 2005-04-25
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1074/jbc.M500106200
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Tumor necrosis factor-alpha reduces argininosuccinate synthase expression and nitric oxide production in aortic endothelial cells.

    Goodwin, Bonnie L / Pendleton, Laura C / Levy, Monique M / Solomonson, Larry P / Eichler, Duane C

    American journal of physiology. Heart and circulatory physiology

    2007  Volume 293, Issue 2, Page(s) H1115–21

    Abstract: Endothelial dysfunction associated with elevated serum levels of TNF-alpha observed in diabetes, obesity, and congenital heart disease results, in part, from the impaired production of endothelial nitric oxide (NO). Cellular NO production depends ... ...

    Abstract Endothelial dysfunction associated with elevated serum levels of TNF-alpha observed in diabetes, obesity, and congenital heart disease results, in part, from the impaired production of endothelial nitric oxide (NO). Cellular NO production depends absolutely on the availability of arginine, substrate of endothelial nitric oxide synthase (eNOS). In this report, evidence is provided demonstrating that treatment with TNF-alpha (10 ng/ml) suppresses not only eNOS expression but also the availability of arginine via the coordinate suppression of argininosuccinate synthase (AS) expression in aortic endothelial cells. Western blot and real-time RT-PCR demonstrated a significant and dose-dependent reduction of AS protein and mRNA when treated with TNF-alpha with a corresponding decrease in NO production. Reporter gene analysis demonstrated that TNF-alpha suppresses the AS proximal promoter, and EMSA analysis showed reduced binding to three essential Sp1 elements. Inhibitor studies suggested that the repression of AS expression by TNF-alpha may be mediated, in part, via the NF-kappaB signaling pathway. These findings demonstrate that TNF-alpha coordinately downregulates eNOS and AS expression, resulting in a severely impaired citrulline-NO cycle. The downregulation of AS by TNF-alpha is an added insult to endothelial function because of its important role in NO production and in endothelial viability.
    MeSH term(s) Animals ; Aorta/cytology ; Aorta/drug effects ; Aorta/enzymology ; Aorta/metabolism ; Arginine/metabolism ; Argininosuccinate Synthase/biosynthesis ; Argininosuccinate Synthase/genetics ; Cattle ; Cell Nucleus/metabolism ; Cells, Cultured ; Citrulline/metabolism ; Dose-Response Relationship, Drug ; Down-Regulation ; Endothelial Cells/drug effects ; Endothelial Cells/enzymology ; Endothelial Cells/metabolism ; Enzyme Repression ; Genes, Reporter ; Luciferases ; NF-kappa B/metabolism ; Nitric Oxide/metabolism ; Nitric Oxide Synthase Type III/biosynthesis ; Nitric Oxide Synthase Type III/genetics ; Promoter Regions, Genetic ; RNA, Messenger/metabolism ; Signal Transduction/drug effects ; Sp1 Transcription Factor/metabolism ; Sp3 Transcription Factor/metabolism ; Transcription, Genetic ; Transfection ; Tumor Necrosis Factor-alpha/metabolism ; Tumor Necrosis Factor-alpha/pharmacology
    Chemical Substances NF-kappa B ; RNA, Messenger ; Sp1 Transcription Factor ; Tumor Necrosis Factor-alpha ; Sp3 Transcription Factor (148710-94-5) ; Citrulline (29VT07BGDA) ; Nitric Oxide (31C4KY9ESH) ; Arginine (94ZLA3W45F) ; Luciferases (EC 1.13.12.-) ; Nitric Oxide Synthase Type III (EC 1.14.13.39) ; Argininosuccinate Synthase (EC 6.3.4.5)
    Language English
    Publishing date 2007-05-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 603838-4
    ISSN 1522-1539 ; 0363-6135
    ISSN (online) 1522-1539
    ISSN 0363-6135
    DOI 10.1152/ajpheart.01100.2006
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Troglitazone up-regulates vascular endothelial argininosuccinate synthase.

    Goodwin, Bonnie L / Corbin, Karen D / Pendleton, Laura C / Levy, Monique M / Solomonson, Larry P / Eichler, Duane C

    Biochemical and biophysical research communications

    2008  Volume 370, Issue 2, Page(s) 254–258

    Abstract: Vascular endothelial nitric oxide (NO) production via the citrulline-NO cycle not only involves the regulation of endothelial nitric oxide synthase (eNOS), but also regulation of caveolar-localized endothelial argininosuccinate synthase (AS), which ... ...

    Abstract Vascular endothelial nitric oxide (NO) production via the citrulline-NO cycle not only involves the regulation of endothelial nitric oxide synthase (eNOS), but also regulation of caveolar-localized endothelial argininosuccinate synthase (AS), which catalyzes the rate-limiting step of the cycle. In the present study, we demonstrated that exposure of endothelial cells to troglitazone coordinately induced AS expression and NO production. Western blot analysis demonstrated an increase in AS protein expression. This increased expression was due to transcriptional upregulation of AS mRNA, as determined by quantitative real time RT-PCR and inhibition by 1-d-ribofuranosylbenzimidazole (DRB), a transcriptional inhibitor. Reporter gene assays and EMSA analyses identified a distal PPARgamma response element (PPRE) (-2471 to -2458) that mediated the troglitazone increase in AS expression. Overall, this study defines a novel molecular mechanism through which a thiazolidinedione (TZD) like troglitazone supports endothelial function via the transcriptional up-regulation of AS expression.
    MeSH term(s) Animals ; Argininosuccinate Synthase/genetics ; Argininosuccinate Synthase/metabolism ; Base Sequence ; Cattle ; Cell Line ; Chromans/pharmacology ; Endothelium, Vascular/drug effects ; Endothelium, Vascular/enzymology ; Gene Expression Regulation/drug effects ; Ligands ; Nitric Oxide/metabolism ; PPAR gamma/agonists ; PPAR gamma/metabolism ; Response Elements/drug effects ; Thiazolidinediones/pharmacology ; Transcription, Genetic/drug effects ; Up-Regulation
    Chemical Substances Chromans ; Ligands ; PPAR gamma ; Thiazolidinediones ; Nitric Oxide (31C4KY9ESH) ; Argininosuccinate Synthase (EC 6.3.4.5) ; troglitazone (I66ZZ0ZN0E)
    Language English
    Publishing date 2008-05-30
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 205723-2
    ISSN 1090-2104 ; 0006-291X ; 0006-291X
    ISSN (online) 1090-2104 ; 0006-291X
    ISSN 0006-291X
    DOI 10.1016/j.bbrc.2008.03.089
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: A 1536-well quantitative high-throughput screen to identify compounds targeting cancer stem cells.

    Mathews, Lesley A / Keller, Jonathan M / Goodwin, Bonnie L / Guha, Rajarshi / Shinn, Paul / Mull, Rebecca / Thomas, Craig J / de Kluyver, Rachel L / Sayers, Thomas J / Ferrer, Marc

    Journal of biomolecular screening

    2012  Volume 17, Issue 9, Page(s) 1231–1242

    Abstract: Tumor cell subpopulations called cancer stem cells (CSCs) or tumor-initiating cells (TICs) have self-renewal potential and are thought to drive metastasis and tumor formation. Data suggest that these cells are resistant to current chemotherapy and ... ...

    Abstract Tumor cell subpopulations called cancer stem cells (CSCs) or tumor-initiating cells (TICs) have self-renewal potential and are thought to drive metastasis and tumor formation. Data suggest that these cells are resistant to current chemotherapy and radiation therapy treatments, leading to cancer recurrence. Therefore, finding new drugs and/or drug combinations that cause death of both the differentiated tumor cells as well as CSC populations is a critical unmet medical need. Here, we describe how cancer-derived CSCs are generated from cancer cell lines using stem cell growth media and nonadherent conditions in quantities that enable high-throughput screening (HTS). A cell growth assay in a 1536-well microplate format was developed with these CSCs and used to screen a focused collection of oncology drugs and clinical candidates to find compounds that are cytotoxic against these highly aggressive cells. A hit selection process that included potency and efficacy measurements during the primary screen allowed us to efficiently identify compounds with potent cytotoxic effects against spheroid-derived CSCs. Overall, this research demonstrates one of the first miniaturized HTS assays using CSCs. The procedures described here should enable further testing of the effect of compounds on CSCs and help determine which pathways need to be targeted to kill them.
    MeSH term(s) Animals ; Antineoplastic Agents/pharmacology ; Cell Culture Techniques ; Cell Line, Tumor ; Cell Proliferation/drug effects ; Drug Discovery/methods ; Drug Evaluation, Preclinical/methods ; High-Throughput Screening Assays/methods ; Homeodomain Proteins/metabolism ; Humans ; Male ; Mice ; Nanog Homeobox Protein ; Neoplasms/drug therapy ; Neoplastic Stem Cells/drug effects ; Small Molecule Libraries/pharmacology
    Chemical Substances Antineoplastic Agents ; Homeodomain Proteins ; Nanog Homeobox Protein ; Nanog protein, mouse ; Small Molecule Libraries
    Language English
    Publishing date 2012-08-27
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 1433680-7
    ISSN 1552-454X ; 1087-0571
    ISSN (online) 1552-454X
    ISSN 1087-0571
    DOI 10.1177/1087057112458152
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: The caveolar nitric oxide synthase/arginine regeneration system for NO production in endothelial cells.

    Solomonson, Larry P / Flam, Brenda R / Pendleton, Laura C / Goodwin, Bonnie L / Eichler, Duane C

    The Journal of experimental biology

    2003  Volume 206, Issue Pt 12, Page(s) 2083–2087

    Abstract: The enzyme endothelial nitric oxide synthase (eNOS) catalyzes the conversion of arginine, oxygen and NADPH to NO and citrulline. Previous results suggest an efficient, compartmentalized system for recycling of citrulline to arginine utilized for NO ... ...

    Abstract The enzyme endothelial nitric oxide synthase (eNOS) catalyzes the conversion of arginine, oxygen and NADPH to NO and citrulline. Previous results suggest an efficient, compartmentalized system for recycling of citrulline to arginine utilized for NO production. In support of this hypothesis, the recycling enzymes, argininosuccinate synthase (AS) and argininosuccinate lyase (AL), have been shown to colocalize with eNOS in caveolae, a subcompartment of the plasma membrane. Under unstimulated conditions, the degree of recycling is minimal. Upon stimulation of NO production by bradykinin, however, recycling is co-stimulated to the extent that more than 80% of the citrulline produced is recycled to arginine. These results suggest an efficient caveolar recycling complex that supports the receptor-mediated stimulation of endothelial NO production. To investigate the molecular basis for the unique location and function of endothelial AS and AL, endothelial AS mRNA was compared with liver AS mRNA. No differences were found in the coding region of the mRNA species, but significant differences were found in the 5'-untranslated region (5'-UTR). The results of these studies suggest that sequence in the endothelial AS-encoding gene, represented by position -92 nt to -43 nt from the translation start site in the extended AS mRNA 5'-UTRs, plays an important role in differential and tissue-specific expression. Overall, a strong evidential case has been developed supporting the proposal that arginine availability, governed by a caveolar-localized arginine regeneration system, plays a key role in receptor-mediated endothelial NO production.
    MeSH term(s) Arginine/biosynthesis ; Argininosuccinate Lyase/metabolism ; Argininosuccinate Synthase/genetics ; Argininosuccinate Synthase/metabolism ; Base Sequence ; Cell Membrane/metabolism ; Endothelium, Vascular/enzymology ; Endothelium, Vascular/ultrastructure ; Molecular Sequence Data ; Nitric Oxide/metabolism ; Nitric Oxide Synthase/metabolism
    Chemical Substances Nitric Oxide (31C4KY9ESH) ; Arginine (94ZLA3W45F) ; Nitric Oxide Synthase (EC 1.14.13.39) ; Argininosuccinate Lyase (EC 4.3.2.1) ; Argininosuccinate Synthase (EC 6.3.4.5)
    Language English
    Publishing date 2003-05-14
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 218085-6
    ISSN 1477-9145 ; 0022-0949
    ISSN (online) 1477-9145
    ISSN 0022-0949
    DOI 10.1242/jeb.00361
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Endothelial argininosuccinate synthase mRNA 5'-untranslated region diversity. Infrastructure for tissue-specific expression.

    Pendleton, Laura C / Goodwin, Bonnie L / Flam, Brenda R / Solomonson, Larry P / Eichler, Duane C

    The Journal of biological chemistry

    2002  Volume 277, Issue 28, Page(s) 25363–25369

    Abstract: Based on the integral role that argininosuccinate synthase (AS) plays in the production of nitric oxide in vascular endothelial cells and urea in liver, an analysis was carried out to determine whether signals reside in the AS mRNA to account for tissue ... ...

    Abstract Based on the integral role that argininosuccinate synthase (AS) plays in the production of nitric oxide in vascular endothelial cells and urea in liver, an analysis was carried out to determine whether signals reside in the AS mRNA to account for tissue differences in AS function and location. Reverse transcriptase-PCR and sequence analysis showed that the AS mRNA coding region was the same for both endothelial cells and liver; however, 5'-RACE analysis (rapid amplification of cDNA ends) identified AS mRNA species in endothelial cells in addition to a major 43-nucleotide (nt) 5'-untranslated region (UTR) AS mRNA with overlapping extended 5'-UTRs of 66 and 92 nt. Comparison to the genomic sequence immediately upstream of the reported transcription start site for the human and mouse AS gene suggested that expression of all three species of bovine endothelial AS mRNA are driven by a common promoter and that 5'-UTR diversity in endothelial cells results from three transcriptional initiation sites within exon 1. RNase protection analysis and real-time reverse transcriptase-PCR verified and quantitated the differential expression of the extended 5'-UTR species relative to the major 43-nt 5'-UTR AS mRNA. In vitro translation studies showed a less pronounced but similar discordant expression. Sequential deletions starting from the 5' terminus of the 92-nt 5'-UTR construct resulted in a corresponding increase in translational efficiency, but the most pronounced effect resulted from mutation of an upstream open reading frame, which restored translational efficiency of the 92-nt 5'-UTR AS mRNA. When the different AS mRNA 5'-UTRs, cloned in front of a luciferase reporter gene, were transfected into endothelial cells, the pattern of luciferase expression was nearly identical to that observed for the different 5'-UTR AS mRNAs in endothelial cells. Given the different roles ascribed for argininosuccinate synthase, urea versus NO production, these results suggest that sequence in the AS gene represented by position -92 to -43 nt from the translation start site in the extended AS mRNA 5'-UTRs plays an important role in differential and tissue-specific expression.
    MeSH term(s) 5' Untranslated Regions ; Animals ; Argininosuccinate Synthase/genetics ; Base Sequence ; Cattle ; DNA Primers ; Endothelium, Vascular/cytology ; Endothelium, Vascular/enzymology ; Liver/enzymology ; RNA, Messenger/genetics ; Reverse Transcriptase Polymerase Chain Reaction
    Chemical Substances 5' Untranslated Regions ; DNA Primers ; RNA, Messenger ; Argininosuccinate Synthase (EC 6.3.4.5)
    Language English
    Publishing date 2002-04-19
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1074/jbc.M111677200
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: A direct mechanistic link between growth control and a tumor cell immune function: increased interleukin-8 secretion accounts for elimination of Oct-1 antisense transformants from scid mice.

    Palubin, Kimberly M / Goodwin, Bonnie L / Niesen, Melissa I / Le, Elizabeth A / Osborne, Aaron R / Blanck, George

    Anticancer research

    2006  Volume 26, Issue 3A, Page(s) 1733–1738

    Abstract: Background: Tumorigenesis involves the aberrant function of proteins that regulate growth control, including Oct-1. Oct-1 is a DNA binding transcription factor that activates genes that encode proteins required for S-phase and cell growth. For example, ... ...

    Abstract Background: Tumorigenesis involves the aberrant function of proteins that regulate growth control, including Oct-1. Oct-1 is a DNA binding transcription factor that activates genes that encode proteins required for S-phase and cell growth. For example, Oct-1 activates the histone H2B promoter and the promoters for the snRNPs. Oct-1 also represses certain promoters, including promoters of immune function genes, such as the IL-8 and the HLA-DRA genes.
    Materials, methods and results: Oct-1 antisense transformants were determined to have reduced growth rates and other characteristics of growth control. Also, Oct-1 antisense transformants endured for a shorter time in scid mice, being attributable to the increased expression of IL-8 by the Oct-1 antisense transformants.
    Conclusion: These results may help resolve the conundrum of why growth control de-regulation alone is not enough for tumorigenicity. The results also support the conclusion that the molecular mechanisms of growth control de-regulation and tumor cell immune functions are directly linked.
    MeSH term(s) Animals ; Cell Growth Processes/genetics ; Cell Growth Processes/immunology ; DNA, Antisense/genetics ; Humans ; Interleukin-8/biosynthesis ; Interleukin-8/genetics ; Interleukin-8/immunology ; Interleukin-8/secretion ; Mice ; Mice, SCID ; Neoplasm Transplantation ; Octamer Transcription Factor-1/genetics ; Transformation, Genetic ; Transplantation, Heterologous ; Urinary Bladder Neoplasms/genetics ; Urinary Bladder Neoplasms/immunology ; Urinary Bladder Neoplasms/pathology ; Urinary Bladder Neoplasms/secretion
    Chemical Substances DNA, Antisense ; Interleukin-8 ; Octamer Transcription Factor-1
    Language English
    Publishing date 2006-05
    Publishing country Greece
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 604549-2
    ISSN 1791-7530 ; 0250-7005
    ISSN (online) 1791-7530
    ISSN 0250-7005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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