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Articles 1 - 22 of 22
Full-Text Articles in Medicine and Health Sciences
Immunomodulatory And Transcriptional Effects Of Progesterone Through Progesterone A And B Receptors In Hec50co Poorly Differentiated Endometrial Cancer Cells, S. Davies, Donghai Dai, D. Wolf, Kimberly Leslie
Immunomodulatory And Transcriptional Effects Of Progesterone Through Progesterone A And B Receptors In Hec50co Poorly Differentiated Endometrial Cancer Cells, S. Davies, Donghai Dai, D. Wolf, Kimberly Leslie
Donghai Dai
OBJECTIVE: Derivatives of progesterone, progestins, are used to treat endometrial cancer; however, the pathways activated by the hormone have not been fully investigated. Progesterone acts through two receptor isoforms, progesterone receptors A and B (PRA and PRB), transcription factors that control the expression of downstream genes leading to endometrial differentiation. The purpose of this study was to perform an expression analysis to identify the mechanisms underlying progesterone's growth suppressive and immunomodulatory effects in endometrial cancer. METHODS: To study the molecular effects of progesterone, PRs were introduced into Hec50co cells. Expression array analyses followed by confirmatory semiquantitive reverse-transcriptase polymerase chain reaction …
Effects Of Bevacizumab In Mouse Model Of Endometrial Cancer: Defining The Molecular Basis For Resistance, S. Davies, Donghai Dai, G. Pickett, K. Thiel, V. Korovkina, Kimberly Leslie
Effects Of Bevacizumab In Mouse Model Of Endometrial Cancer: Defining The Molecular Basis For Resistance, S. Davies, Donghai Dai, G. Pickett, K. Thiel, V. Korovkina, Kimberly Leslie
Donghai Dai
Endometrial cancer is the most frequent gynecologic cancer in women. Long-term outcomes for patients with advanced stage or recurrent disease are poor. Targeted molecular therapy against the vascular endothelial growth factor (VEGF) and its receptors constitute a new therapeutic option for these patients. The goal of our study was to assess the potential effectiveness of inhibition of VEGF/VEGFR signaling in a xenograft model of endometrial cancer using bevacizumab (Avastin, a humanized antibody against VEGFA). We also aimed to identify molecular markers of sensitivity or resistance to this agent. We show that bevacizumab retards tumor growth in athymic mice by inhibiting …
A Potential Synergistic Anticancer Effect Of Paclitaxel And Amifostine On Endometrial Cancer, Donghai Dai, A. Holmes, T. Nguyen, S. Davies, D. Theele, C. Verschraegen, Kimberly Leslie
A Potential Synergistic Anticancer Effect Of Paclitaxel And Amifostine On Endometrial Cancer, Donghai Dai, A. Holmes, T. Nguyen, S. Davies, D. Theele, C. Verschraegen, Kimberly Leslie
Donghai Dai
Although paclitaxel is one of the most effective chemotherapeutic agents, its usefulness is still limited in advanced and recurrent endometrial cancer. Amifostine protection of normal tissues against the side effects of chemotherapeutic agents has been clinically proven in cancer patients; however, its application in endometrial cancer has not been fully evaluated. We have investigated the use of paclitaxel and amifostine in controlling the growth of poorly differentiated endometrial cancer cells, Hec50co, in vitro and in vivo. Our studies show that amifostine had direct anticancer effects on endometrial cancer cells in vitro by arresting the cell cycle at the G1 phase …
Amifostine Enhancement Of The Anti-Cancer Effects Of Paclitaxel In Endometrial Cancer Is Tp53-Dependent, W. Luo, F. Wu, R. Elmaoued, B. Beck, E. Fischer, Xiangbing Meng, Kimberly Leslie, Donghai Dai
Amifostine Enhancement Of The Anti-Cancer Effects Of Paclitaxel In Endometrial Cancer Is Tp53-Dependent, W. Luo, F. Wu, R. Elmaoued, B. Beck, E. Fischer, Xiangbing Meng, Kimberly Leslie, Donghai Dai
Donghai Dai
Endometrial cancer (ECa) is the fourth most common malignancy in women. Currently, there is no effective therapy for advanced and recurrent cancer. Among the poor-outcome endometrial cancers, there is a high frequency of TP53 mutations. We have previously reported that amifostine has a direct anti-cancer effect and has a significant synergistic effect with paclitaxel when used in endometrial cancer cell and xenograft models. In this report, using a cell line with knock-down p53 expression through siRNA, we found that amifostine enhancement of paclitaxel's anticancer effect is p53 status-dependent. Amifostine promotes entry into the G2-M phase through regulation of cyclin-dependent kinase-1 …
Gene Regulation Profiles By Progesterone And Dexamethasone In Human Endometrial Cancer Ishikawa H Cells, S. Davies, Donghai Dai, G. Pickett, Kimberly Leslie
Gene Regulation Profiles By Progesterone And Dexamethasone In Human Endometrial Cancer Ishikawa H Cells, S. Davies, Donghai Dai, G. Pickett, Kimberly Leslie
Donghai Dai
OBJECTIVE: Progesterone and glucocorticoids such as dexamethasone mediate distinct biological functions, yet they bind to receptors that recognize the same consensus DNA response element. In breast cancer, progestins are associated with the incidence and progression of tumors, whereas glucocorticoids are growth-suppressive in mammary cancer cells; the differential effects of these two steroids are less well understood in the hormone-dependent disease cancer of the uterine endometrium. We set out to identify genes that are regulated by progesterone through progesterone receptors and dexamethasone through glucocorticoid receptors in a well-differentiated human endometrial cancer cell line. METHODS: PR- and GR-positive Ishikawa H endometrial cancer …
Progesterone Receptor Isoform Identification And Subcellular Localization In Endometrial Cancer, Kimberly Leslie, M. Stein, N. Kumar, Donghai Dai, J. Stephens, A. Wandinger-Ness, D. Glueck
Progesterone Receptor Isoform Identification And Subcellular Localization In Endometrial Cancer, Kimberly Leslie, M. Stein, N. Kumar, Donghai Dai, J. Stephens, A. Wandinger-Ness, D. Glueck
Donghai Dai
OBJECTIVE: These studies were undertaken to characterize the subcellular localization of the two major isoforms of progesterone receptors (PR), PRA and PRB, in endometrial cancer. METHODS: Immunohistochemistry, immunoprecipitation, and confocal microscopy were performed using Hec50co and KLE endometrial cancer cell models expressing PRA or PRB as a consequence of transduction. The location of PRB compared to PRA was determined, and antibodies were tested for specificity with respect to PR isoform recognition. Immunohistochemical analyses of PR expression and subcellular compartmentalization were also performed on 20 formalin-fixed endometrial cancer tumors. RESULTS: Morphological and biochemical evaluations demonstrated that PRA is localized to the …
Progesterone Inhibits Human Endometrial Cancer Cell Growth And Invasiveness: Down-Regulation Of Cellular Adhesion Molecules Through Progesterone B Receptors, Donghai Dai, D. Wolf, E. Litman, M. White, Kimberly Leslie
Progesterone Inhibits Human Endometrial Cancer Cell Growth And Invasiveness: Down-Regulation Of Cellular Adhesion Molecules Through Progesterone B Receptors, Donghai Dai, D. Wolf, E. Litman, M. White, Kimberly Leslie
Donghai Dai
Progesterone is a critical steroid hormone that controls cell proliferation and differentiation in the female reproductive tract. Progesterone acts through two nuclear receptor isoforms, progesterone receptors A and B (PRA and PRB, respectively), each with unique cellular effects. Loss of PRB has recently been linked to the development of poorly differentiated endometrial tumors, a lethal form of cancer. To study the molecular effects of progesterone, progesterone receptors were introduced into Hec50co endometrial cancer cells by adenoviral vectors encoding either PRA or PRB. Progesterone induced the cyclin-dependent kinase inhibitors p21 and p27, thereby significantly reducing the percentage of proliferating cells. Cancer …
Identification Of A Novel Mechanism Of Nf-Kappab Inactivation By Progesterone Through Progesterone Receptors In Hec50co Poorly Differentiated Endometrial Cancer Cells: Induction Of A20 And Abin-2, S. Davies, Donghai Dai, I. Feldman, G. Pickett, Kimberly Leslie
Identification Of A Novel Mechanism Of Nf-Kappab Inactivation By Progesterone Through Progesterone Receptors In Hec50co Poorly Differentiated Endometrial Cancer Cells: Induction Of A20 And Abin-2, S. Davies, Donghai Dai, I. Feldman, G. Pickett, Kimberly Leslie
Donghai Dai
OBJECTIVE: Nuclear factor kappa B (NFkappaB) is a strong anti-apoptotic factor, which is constitutively active in human endometrial cancer cells. Progesterone is the principal growth inhibitory hormone in the endometrial epithelium and promotes apoptosis. To identify the pathways through which progesterone controls NFkappaB function, we explored its genomic and non-genomic effects in endometrial cancer cells. METHODS: PR-negative Hec50co endometrial cancer cells were engineered to express high levels of the A or B isoform of PR (PRA or PRB) by adenoviral infection. Cells were treated with progesterone or vehicle alone, and RNA was isolated. Affymetrix microarrays were performed and transcriptional control …
A Therapeutic Model For Advanced Endometrial Cancer: Systemic Progestin In Combination With Local Adenoviral-Mediated Progesterone Receptor Expression, Donghai Dai, L. Albitar, T. Nguyen, L. Laidler, M. Singh, Kimberly Leslie
A Therapeutic Model For Advanced Endometrial Cancer: Systemic Progestin In Combination With Local Adenoviral-Mediated Progesterone Receptor Expression, Donghai Dai, L. Albitar, T. Nguyen, L. Laidler, M. Singh, Kimberly Leslie
Donghai Dai
Cancer of the uterine endometrium is a frequent gynecologic malignant disease for which few therapeutic options are available for advanced disease. Progesterone is the normal female hormone that limits growth and proliferation of endometrial cancers; however, progesterone receptors are frequently down-regulated, leading to treatment failures. The current studies explored the effectiveness of adenoviral-mediated progesterone receptor gene transduction in combination with progestin therapy in mouse xenograft models. Pretreatment of cells with progesterone receptor-encoding adenovirus and progestin inhibited the development of s.c. tumors in athymic mice. In the i.p. xenograft model, replacement of both isoforms of progesterone receptor, PRA and PRB, in …
Gestational Trophoblastic Diseases: 1. Pathophysiology Of Hyperglycosylated Hcg, L. Cole, Donghai Dai, S. Butler, Kimberly Leslie, E. Kohorn
Gestational Trophoblastic Diseases: 1. Pathophysiology Of Hyperglycosylated Hcg, L. Cole, Donghai Dai, S. Butler, Kimberly Leslie, E. Kohorn
Donghai Dai
OBJECTIVE: Hyperglycosylated hCG (hCG-H) is a glycosylation variant of hCG produced by cytotrophoblast cells at implantation of pregnancy and in choriocarcinoma. We investigated the biological function of hCG-H in invasion in vitro and in vivo and the use of hCG-H antibodies in blocking tumorigenesis and cancer growth in vivo. METHODS AND RESULTS: hCG-H accounts for 43% to 100% of total hCG immunoreactivity in the culture fluid of choriocarcinoma cell lines and 100% in primary cultures of pregnancy cytotrophoblast cells. We investigated the action of hCG and hCG-H on isolated cytotrophoblast cell primary cultures and on 3 different lines of choriocarcinoma …
Quantitative Interpretation Of A Genetic Model Of Carcinogenesis Using Computer Simulations, Donghai Dai, B. Beck, X. Wang, C. Howk, Y. Li
Quantitative Interpretation Of A Genetic Model Of Carcinogenesis Using Computer Simulations, Donghai Dai, B. Beck, X. Wang, C. Howk, Y. Li
Donghai Dai
The genetic model of tumorigenesis by Vogelstein et al. (V theory) and the molecular definition of cancer hallmarks by Hanahan and Weinberg (W theory) represent two of the most comprehensive and systemic understandings of cancer. Here, we develop a mathematical model that quantitatively interprets these seminal cancer theories, starting from a set of equations describing the short life cycle of an individual cell in uterine epithelium during tissue regeneration. The process of malignant transformation of an individual cell is followed and the tissue (or tumor) is described as a composite of individual cells in order to quantitatively account for intra-tumor …
Determination Of Haleniaside And Demethoxyhaleniaside In Wild And Cultivated Halenia Ellipitica D. Don. By Reversed-Phase High Performance Liquid Chromatography, L. Ji, C. Ding, G. Chen, Donghai Dai, Y. Yang
Determination Of Haleniaside And Demethoxyhaleniaside In Wild And Cultivated Halenia Ellipitica D. Don. By Reversed-Phase High Performance Liquid Chromatography, L. Ji, C. Ding, G. Chen, Donghai Dai, Y. Yang
Donghai Dai
A simple and accurate method for the determination of haleniaside and demethoxyhaleniaside in Halenia ellipitica D. Don. materials and patent medicines with high performance liquid chromatography (HPLC) was developed. The two components were extracted from powdered samples with methanol. The resultant extract was separated within 45 min on a VP-ODS C18 column (4.6 mm i.d. x 250 mm, 5 microm) under gradient elution with a mixture of acetonitrile-phosphate buffer at a flow rate of 1.0 mL/min. The detection wavelength was 254 nm and the injection volume was 20 microL. Under gradient elution program the volume fractions of acetonitrile in mobile …
The Nitric Oxide-Cyclic Gmp Pathway Plays An Essential Role In Both Promoting Cell Survival Of Cerebellar Granule Cells In Culture And Protecting The Cells Against Ethanol Neurotoxicity, N. Pantazis, J. West, Donghai Dai
The Nitric Oxide-Cyclic Gmp Pathway Plays An Essential Role In Both Promoting Cell Survival Of Cerebellar Granule Cells In Culture And Protecting The Cells Against Ethanol Neurotoxicity, N. Pantazis, J. West, Donghai Dai
Donghai Dai
NMDA has two beneficial effects on primary neuronal cultures of cerebellar granule cells (CGCs) established from 10-day-old rat pups. First, NMDA is neurotrophic and will enhance survival of CGCs in culture in the absence of ethanol. Second, ethanol exposure will induce cell death in CGC cultures, and NMDA can lessen this ethanol-induced cell loss, i.e., NMDA is neuroprotective. Because NMDA can stimulate production of nitric oxide (NO), which can in turn enhance synthesis of cyclic GMP, this study tested the hypothesis that the NO-cyclic GMP pathway is essential for NMDA-mediated neurotrophism and neuroprotection. Inhibiting the synthesis of NO with N(G)-nitro-L-arginine …
Mrna Expression In Rabbit Experimental Aneurysms: A Study Using Gene Chip Microarrays, W. Mangrum, F. Farassati, R. Kadirvel, C. Kolbert, S. Raghavakaimal, Donghai Dai, Y. Ding, D. Grill, V. Khurana, D. Kallmes
Mrna Expression In Rabbit Experimental Aneurysms: A Study Using Gene Chip Microarrays, W. Mangrum, F. Farassati, R. Kadirvel, C. Kolbert, S. Raghavakaimal, Donghai Dai, Y. Ding, D. Grill, V. Khurana, D. Kallmes
Donghai Dai
BACKGROUND AND PURPOSE: The molecular characteristics of intracranial aneurysms are still poorly documented. A rabbit elastase aneurysm model has been helpful in the evaluation of devices and strategies involved in endovascular treatment of aneurysms. The goal of this project was to document the molecular changes, assessed by gene chip microarrays, associated with the creation of aneurysms in this model compared with the contralateral carotid artery. MATERIALS AND METHODS: A microarray of rabbit genes of interest was constructed using rabbit nucleotide sequences from GenBank. Elastase-induced saccular aneurysms were created at the origin of the right common carotid artery in 4 rabbits. …
Vascular Endothelial Growth Factor Pathway Blockade In Endometrial Cancer, Suzy Davies, Donghai Dai, Kimberly Leslie
Vascular Endothelial Growth Factor Pathway Blockade In Endometrial Cancer, Suzy Davies, Donghai Dai, Kimberly Leslie
Donghai Dai
No abstract provided.
Transfection Of C6 Glioma Cells With Glia Maturation Factor Upregulates Brain-Derived Neurotrophic Factor And Nerve Growth Factor: Trophic Effects And Protection Against Ethanol Toxicity In Cerebellar Granule Cells, N. Pantazis, A. Zaheer, Donghai Dai, S. Zaheer, S. Green, R. Lim
Transfection Of C6 Glioma Cells With Glia Maturation Factor Upregulates Brain-Derived Neurotrophic Factor And Nerve Growth Factor: Trophic Effects And Protection Against Ethanol Toxicity In Cerebellar Granule Cells, N. Pantazis, A. Zaheer, Donghai Dai, S. Zaheer, S. Green, R. Lim
Donghai Dai
Glial cells play active roles in neuronal survival, as well as neuroprotection against toxic insult. Recent studies suggest that the brain protein glia maturation factor (GMF) is involved in intracellular signaling in glia. This study investigated whether or not GMF plays a role in the survival-promoting and neuroprotective functions of glia. C6 glioma cells were transfected in vitro with GMF utilizing an adenovirus vector. The transfected cells overexpressed GMF intracellularly, but did not secrete the protein. The conditioned medium (CM) was obtained from the GMF-transfected cells (CM-GMF) and tested on primary neuronal cultures, consisting of cerebellar granule cells (CGC). The …
Preclinical Development Of A Neutral, Estrogen Receptor-Targeted, Tridentate 99mtc(I)-Estradiol-Pyridin-2-Yl Hydrazine Derivative For Imaging Of Breast And Endometrial Cancers, T. Nayak, H. Hathaway, C. Ramesh, J. Arterburn, Donghai Dai, L. Sklar, J. Norenberg, E. Prossnitz
Preclinical Development Of A Neutral, Estrogen Receptor-Targeted, Tridentate 99mtc(I)-Estradiol-Pyridin-2-Yl Hydrazine Derivative For Imaging Of Breast And Endometrial Cancers, T. Nayak, H. Hathaway, C. Ramesh, J. Arterburn, Donghai Dai, L. Sklar, J. Norenberg, E. Prossnitz
Donghai Dai
Breast and endometrial cancers are the most common invasive malignancies in women, with more than 217,000 new diagnoses per year in the United States. These cancers are often classified into 2 subtypes based on the expression of the classical estrogen receptor. In this study, we describe a new structural class of neutral tridentate 99mTc(I)-estradiol-pyridin-2-yl hydrazine derivatives for potential use in breast and endometrial cancer imaging. METHODS: The 99mTc(I)-estradiol-pyridin-2-yl hydrazine derivative was synthesized via the Sonogashira cross-coupling reaction and radiolabeled via the tricarbonyl approach. Radiochemical purity was assessed by high-performance liquid chromatography. Cell-binding studies were performed with human breast adenocarcinoma MCF-7 …
Induction Of Mitotic Cell Death By Overriding G2/M Checkpoint In Endometrial Cancer Cells With Non-Functional P53, Xiangbing Meng, Laura Laidler, Elizabeth Kosmacek, Shujie Yang, Zhi Xiong, Danlin Zhu, Xinjun Wang, Donghai Dai, Yuping Zhang, Xiaofang Wang, Pavia Brachova, Lina Albitar, Dawei Liu, Florenza Ianzini, Michael Mackey, Kimberly Leslie
Induction Of Mitotic Cell Death By Overriding G2/M Checkpoint In Endometrial Cancer Cells With Non-Functional P53, Xiangbing Meng, Laura Laidler, Elizabeth Kosmacek, Shujie Yang, Zhi Xiong, Danlin Zhu, Xinjun Wang, Donghai Dai, Yuping Zhang, Xiaofang Wang, Pavia Brachova, Lina Albitar, Dawei Liu, Florenza Ianzini, Michael Mackey, Kimberly Leslie
Donghai Dai
OBJECTIVE: Endometrial tumors with non-functional p53, such as serous uterine endometrial carcinomas, are aggressive malignancies with a poor outcome, yet they have an Achilles' heel: due to loss of p53 function, these tumors may be sensitive to treatments which abrogate the G2/M checkpoint. Our objective was to exploit this weakness to induce mitotic cell death using two strategies: (1) EGFR inhibitor gefitinib combined with paclitaxel to arrest cells at mitosis, or (2) BI2536, an inhibitor of polo-like kinase 1 (PLK1), to block PLK1 activity. METHODS: We examined the impact of combining gefitinib and paclitaxel or PLK1 inhibitor on expression of …
Fgf-2, Ngf And Igf-1, But Not Bdnf, Utilize A Nitric Oxide Pathway To Signal Neurotrophic And Neuroprotective Effects Against Alcohol Toxicity In Cerebellar Granule Cell Cultures, D. Bonthius, B. Karacay, Donghai Dai, N. Pantazis
Fgf-2, Ngf And Igf-1, But Not Bdnf, Utilize A Nitric Oxide Pathway To Signal Neurotrophic And Neuroprotective Effects Against Alcohol Toxicity In Cerebellar Granule Cell Cultures, D. Bonthius, B. Karacay, Donghai Dai, N. Pantazis
Donghai Dai
Neuronal death is a prominent neuropathological component of fetal alcohol syndrome (FAS). Identification of molecular agents and pathways that can ameliorate alcohol-induced cell loss offers possible therapeutic strategies for FAS and potential insight into its pathogenesis. This study investigated the effects of growth factors on cellular survival in alcohol-exposed cerebellar granule cell (CGC) cultures and examined the role of the nitric oxide (NO)-cGMP-PKG (cGMP-dependent protein kinase) pathway in the cell survival-promoting effects of these growth factors. Primary CGC cultures were exposed to 0 or 400 mg/dl ethanol, accompanied by either no growth factor or 30 ng/ml fibroblast growth factor-2 (FGF-2), …
Postoperative Irradiation In Malignant Tumors Of Submandibular Gland, Donghai Dai
Postoperative Irradiation In Malignant Tumors Of Submandibular Gland, Donghai Dai
Donghai Dai
A retrospective review of 18 patients with treated primary malignant tumors of submandibular gland is presented. The data revealed that initial control of malignancies was inversely related to the presence of disease and surgical margins. Postoperative radiation therapy was used in cases with positive surgical margins. Of the patients with inadequate surgical margins, 71% achieved local relapse when they had surgery alone, compared with 27% of the group that received postoperative irradiation. This study suggests that adjuvant radiation therapy may improve the local control and survival. Such therapy can serve as the salvage method for those who have inadequate surgical …
Defining Genetic Intra-Tumor Heterogeneity: A Chronological Annotation Of Mutational Pathways, Wentao Luo, Fan Wu, Susan R. Atlas, Gavin Pickett, Kimberly K. Leslie, Donghai Dai
Defining Genetic Intra-Tumor Heterogeneity: A Chronological Annotation Of Mutational Pathways, Wentao Luo, Fan Wu, Susan R. Atlas, Gavin Pickett, Kimberly K. Leslie, Donghai Dai
Donghai Dai
Tumor heterogeneity is believed to be important in tumor progression and its response to therapies. However, despite numerous mutations being reported in human tumors, genetic intra-tumor heterogeneity remains poorly defined. We have developed a novel strategy to provide a chronological annotation of mutational events in a tumor. We used an endometrial tumor from a patient and transplanted it into athymic mice to create many tumor xenografts. While the patient tumor xenografts were initially responsive to raloxifene treatment, xenografts created with cancer cell clones isolated from the same patient tumor showed dramatic differences in response to raloxifene, indicating existence of intra-tumor …
The Combination Of Paclitaxel And Gefitinib Inhibits Endometrial Cancer Cells By Inducing Mitotic Catastrophe: Proof Of Principle For Dual Therapy In Endometrial Cancer, Xiangbing Meng, Laura L. Laidler, Lina Albitar, Anna M. Holmes, Donghai Dai, Thomas E. Buekers, David P. Bender, Kimberly K. Leslie
The Combination Of Paclitaxel And Gefitinib Inhibits Endometrial Cancer Cells By Inducing Mitotic Catastrophe: Proof Of Principle For Dual Therapy In Endometrial Cancer, Xiangbing Meng, Laura L. Laidler, Lina Albitar, Anna M. Holmes, Donghai Dai, Thomas E. Buekers, David P. Bender, Kimberly K. Leslie
Donghai Dai
Serous uterine endometrial cancer is a lethal disease for which new therapeutic regimens are urgently needed. Combinations of chemotherapeutic agents and small molecule growth factor inhibitors have demonstrated activity in cancers from other sites. Our objective was to determine whether such a combination using Paclitaxel and Gefitinib could be active in serous endometrial cancer cells.