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Topoisomerase prostate

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https://www.readbyqxmd.com/read/27771897/profiling-of-signaling-proteins-in-penumbra-after-focal-photothrombotic-infarct-in-the-rat-brain-cortex
#1
Svetlana Demyanenko, Anatoly Uzdensky
In ischemic stroke, cell damage propagates from infarct core to surrounding tissue. To reveal proteins involved in neurodegeneration and neuroprotection, we explored the protein profile in penumbra surrounding the photothrombotic infarct core induced in rat cerebral cortex by local laser irradiation after Bengal Rose administration. Using antibody microarrays, we studied changes in expression of 224 signaling proteins 1, 4, or 24 h after photothrombotic infarct compared with untreated contralateral cortex...
October 22, 2016: Molecular Neurobiology
https://www.readbyqxmd.com/read/27643560/novel-2-aryl-4-4-hydroxyphenyl-5h-indeno-1-2-b-pyridines-as-potent-dna-non-intercalative-topoisomerase-catalytic-inhibitors
#2
Seojeong Park, Tara Man Kadayat, Kyu-Yeon Jun, Til Bahadur Thapa Magar, Ganesh Bist, Aarajana Shrestha, Eung-Seok Lee, Youngjoo Kwon
On the basis of previous reports on the importance of thienyl, furyl or phenol group substitution on 5H-indeno[1,2-b]pyridine skeleton, a new series of rigid 2-aryl-4-(4'-hydroxyphenyl)-5H-indeno[1,2-b]pyridine derivatives were systematically designed and synthesized. Topoisomerase inhibitory activity and antiproliferative activity of all the synthesized compounds were determined using human colorectal (HCT15), breast (T47D), prostate (DU145) and cervix (HeLa) cancer cells. Compounds 9, 10, 12, 13, 15, 16, 18 and 19 with thienyl or furyl moiety at the 2-position and hydroxyl group at the meta or para positions of 4-phenyl ring displayed strong to moderate topoisomerase IIα (topo IIα) inhibitory activity and significant antiproliferative activity...
September 8, 2016: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/27537875/the-role-of-%C3%AE-1-adrenoceptor-antagonists-in-the-treatment-of-prostate-and-other-cancers
#3
REVIEW
Mallory Batty, Rachel Pugh, Ilampirai Rathinam, Joshua Simmonds, Edwin Walker, Amanda Forbes, Shailendra Anoopkumar-Dukie, Catherine M McDermott, Briohny Spencer, David Christie, Russ Chess-Williams
This review evaluates the role of α-adrenoceptor antagonists as a potential treatment of prostate cancer (PCa). Cochrane, Google Scholar and Pubmed were accessed to retrieve sixty-two articles for analysis. In vitro studies demonstrate that doxazosin, prazosin and terazosin (quinazoline α-antagonists) induce apoptosis, decrease cell growth, and proliferation in PC-3, LNCaP and DU-145 cell lines. Similarly, the piperazine based naftopidil induced cell cycle arrest and death in LNCaP-E9 cell lines. In contrast, sulphonamide based tamsulosin did not exhibit these effects...
2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27435006/new-spiro-acridines-dna-interaction-antiproliferative-activity-and-inhibition-of-human-dna-topoisomerases
#4
Sinara Mônica Vitalino de Almeida, Elizabeth Almeida Lafayette, Willams Leal Silva, Vanessa de Lima Serafim, Thais Meira Menezes, Jorge Luiz Neves, Ana Lucia Tasca Gois Ruiz, João Ernesto de Carvalho, Ricardo Olímpio de Moura, Eduardo Isidoro Carneiro Beltrão, Luiz Bezerra de Carvalho Júnior, Maria do Carmo Alves de Lima
Two new spiro-acridines were synthesized by introducing cyano-N-acylhydrazone between the acridine and phenyl rings followed by spontaneous cyclization. The final compounds (E)-1'-(benzylideneamino)-5'-oxo-1',5'-dihydro-10H-spiro[acridine-9,2'-pyrrole]-4'-carbonitrile (AMTAC-01) and (E)-1'-((4-methoxybenzylidene)amino)-5'-oxo-1',5'-dihydro-10H-spiro[acridine-9,2'-pyrrole]-4'-carbonitrile (AMTAC-02) were evaluated for their interactions with calf thymus DNA, antiproliferative and human topoisomerase I and IIα inhibitory activities...
November 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27301177/in-vitro-and-in-vivo-therapeutic-evaluation-of-camptothecin-encapsulated-%C3%AE-cyclodextrin-nanosponges-in-prostate-cancer
#5
Casimiro Luca Gigliotti, Rosalba Minelli, Roberta Cavalli, Sergio Occhipinti, Giuseppina Barrera, Stefania Pizzimenti, Giuseppe Cappellano, Elena Boggio, Laura Conti, Roberto Fantozzi, Mirella Giovarelli, Francesco Trotta, Umberto Dianzani, Chiara Dianzani
Camptothecin (CPT), a pentacyclic alkaloid, is an inhibitor of DNA Topoisomerase-I and shows a wide spectrum of anti-cancer activities. The use of CPT has been hampered by poor aqueous solubility and a high degradation rate. Previously, it has been reported that CPT encapsulated in β-cyclodextrin-nanosponges (CN-CPT) overcomes these disadvantages and improves the CPT's inhibitory effect on DU145 prostate tumor cell lines, and PC-3 growth in vitro. This work extends these observations by showing that CN-CPT significantly inhibits the adhesion and migration of these tumor cells and their STAT3 phosphorylation...
January 2016: Journal of Biomedical Nanotechnology
https://www.readbyqxmd.com/read/27277821/dissociation-of-nsc606985-induces-atypical-er-stress-and-cell-death-in-prostate-cancer-cells
#6
Liping Wang, Pengcheng Fu, Yuan Zhao, Guo Wang, Richard Yu, Xin Wang, Zehai Tang, Julianne Imperato-McGinley, Yuan-Shan Zhu
Castration-resistant prostate cancer (CRPC) is a major cause of prostate cancer (Pca) death. Chemotherapy is able to improve the survival of CRPC patients. We previously found that NSC606985 (NSC), a highly water-soluble camptothecin analog, induced cell death in Pca cells via interaction with topoisomerase 1 and activation of the mitochondrial apoptotic pathway. To further elucidate the role of NSC, we studied the effect of NSC on ER-stress and its association with NSC-induced cell death in Pca cells. NSC produced a time- and dose-dependent induction of GRP78, CHOP and XBP1s mRNA, and CHOP protein expression in Pca cells including DU145, indicating an activation of ER-stress...
August 2016: International Journal of Oncology
https://www.readbyqxmd.com/read/27166396/testosterone-in-androgen-receptor-signaling-and-dna-repair-enemy-or-frenemy
#7
Melvin Lee Kiang Chua, Robert G Bristow
Androgen suppression mediates transcriptional downregulation of DNA repair genes. Stimulation with supraphysiologic levels of dihydrotestosterone induces formation of lethal DNA breaks through recruitment of topoisomerase II enzymes to fragile DNA sites. Bipolar castration and stimulation that contributes to increasing DNA damage represents a novel strategy of sensitizing prostate cancer to cytotoxic therapies, including radiotherapy. Clin Cancer Res; 22(13); 3124-6. ©2016 AACRSee related article by Hedayati et al...
July 1, 2016: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/27139157/preliminary-evaluation-of-prostate-targeted-radiotherapy-using-131-i-mip-1095-in-combination-with-radiosensitising-chemotherapeutic-drugs
#8
Mathias Tesson, Colin Rae, Colin Nixon, John W Babich, Robert J Mairs
OBJECTIVES: Despite recent advances in the treatment of metastatic prostate cancer, survival rates are low and treatment options are limited to chemotherapy and hormonal therapy. (131) I-MIP-1095 is a recently developed prostate-specific membrane antigen (PSMA)-targeting, small molecular weight radiopharmaceutical which has anti-tumour activity as a single agent. Our purpose was to determine in vitro the potential benefit to be gained by combining (131) I-MIP-1095 with cytotoxic drug treatments...
July 2016: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/27128689/deazaflavin-inhibitors-of-tyrosyl-dna-phosphodiesterase-2-tdp2-specific-for-the-human-enzyme-and-active-against-cellular-tdp2
#9
Christophe Marchand, Monica Abdelmalak, Jayakanth Kankanala, Shar-Yin Huang, Evgeny Kiselev, Katherine Fesen, Kayo Kurahashi, Hiroyuki Sasanuma, Shunichi Takeda, Hideki Aihara, Zhengqiang Wang, Yves Pommier
Tyrosyl-DNA phosphodiesterase 2 repairs irreversible topoisomerase II-mediated cleavage complexes generated by anticancer topoisomerase-targeted drugs and processes replication intermediates for picornaviruses (VPg unlinkase) and hepatitis B virus. There is currently no TDP2 inhibitor in clinical development. Here, we report a series of deazaflavin derivatives that selectively inhibit the human TDP2 enzyme in a competitive manner both with recombinant and native TDP2. We show that mouse, fish, and C. elegans TDP2 enzymes are highly resistant to the drugs and that key protein residues are responsible for drug resistance...
July 15, 2016: ACS Chemical Biology
https://www.readbyqxmd.com/read/26891441/-mitoxantrone-role-in-treatment-of-primary-progressive-multiple-sclerosis
#10
REVIEW
Żanna Pastuszak, Adam Stępień, Kazimierz Tomczykiewicz, Renata Piusińska-Macoch, Marta Durka-Kęsy
Multiple sclerosis is a chronic, autoimmunological disease of central nervous system in which axonal damage in brain and spinal cord is observed. It is second most common cause of disability in young adults in West Europe and North America after injuries. There is 2.5 million people suffered from multiple sclerosis worldwide. The worse prognosis is connected with primary progressive MS in which recovery after first symptoms of central nervous system damage isn't observed. That subtype of disease is seen in case of 10-20% people with MS...
January 2016: Polski Merkuriusz Lekarski: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/26831716/androgen-deprivation-followed-by-acute-androgen-stimulation-selectively-sensitizes-ar-positive-prostate-cancer-cells-to-ionizing-radiation
#11
Mohammad Hedayati, Michael C Haffner, Jonathan B Coulter, Raju R Raval, Yonggang Zhang, Haoming Zhou, Omar Mian, Emma J Knight, Nina Razavi, Susan Dalrymple, John T Isaacs, Aileen Santos, Russell Hales, William G Nelson, Srinivasan Yegnasubramanian, Theodore L DeWeese
PURPOSE: The current standard of care for patients with locally advanced prostate cancer is a combination of androgen deprivation and radiation therapy. Radiation is typically given with androgen suppression when testosterone levels are at their nadir. Recent reports have shown that androgen stimulation of androgen-deprived prostate cancer cells leads to formation of double-strand breaks (DSB). Here, we exploit this finding and investigate the extent and timing of androgen-induced DSBs and their effect on tumor growth following androgen stimulation in combination with ionizing radiation (IR)...
July 1, 2016: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/26619196/in-vitro-anticancer-activities-of-schiff-base-and-its-lanthanum-complex
#12
Neelima, Kavita Poonia, Sahabjada Siddiqui, Md Arshad, Dinesh Kumar
Schiff base metal complexes are well-known to intercalate DNA. The La(III) complexes have been synthesized such that they hinder with the role of the topoisomerases, which control the topology of DNA during the cell-division cycle. Although several promising chemotherapeutics have been developed, on the basis of Schiff base metal complex DNA intercalating system they did not proceed past clinical trials due to their dose-limiting toxicity. Herein, we discuss an alternative compound, the La(III) complex, [La(L(1))2Cl3]·7H2O based on a Schiff base ligand 2,3-dihydro-1H-indolo-[2,3-b]-phenazin-4(5H)-ylidene)benzothiazole-2-amine (L(1)), and report in vitro cell studies...
February 15, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/26608463/osteoprotegerin-secreted-by-inflammatory-and-invasive-breast-cancer-cells-induces-aneuploidy-cell-proliferation-and-angiogenesis
#13
Sudeshna Goswami, Neelam Sharma-Walia
BACKGROUND: Osteoprotegerin (OPG) is a glycoprotein that has multifaceted role and is associated with several cancer malignancies like that of bladder carcinoma, gastric carcinoma, prostate cancer, multiple myeloma and breast cancer. Also OPG has been associated with several organ pathologies. The widespread expression of OPG suggests that OPG may have multiple biological activities that are yet to be explored. METHODS: The anchorage-independent sphere cultures of the adherent cells were instrumental in our study as it provided a deeper insight into the complexity of a 3D tumor...
2015: BMC Cancer
https://www.readbyqxmd.com/read/26571387/tumor-repression-of-vcap-xenografts-by-a-pyrrole-imidazole-polyamide
#14
Amanda E Hargrove, Thomas F Martinez, Alissa A Hare, Alexis A Kurmis, John W Phillips, Sudha Sud, Kenneth J Pienta, Peter B Dervan
Pyrrole-imidazole (Py-Im) polyamides are high affinity DNA-binding small molecules that can inhibit protein-DNA interactions. In VCaP cells, a human prostate cancer cell line overexpressing both AR and the TMPRSS2-ERG gene fusion, an androgen response element (ARE)-targeted Py-Im polyamide significantly downregulates AR driven gene expression. Polyamide exposure to VCaP cells reduced proliferation without causing DNA damage. Py-Im polyamide treatment also reduced tumor growth in a VCaP mouse xenograft model...
2015: PloS One
https://www.readbyqxmd.com/read/26560244/topoisomerase-2-alpha-cooperates-with-androgen-receptor-to-contribute-to-prostate-cancer-progression
#15
J L Schaefer-Klein, Stephen J Murphy, Sarah H Johnson, George Vasmatzis, Irina V Kovtun
Overexpression of TOP2A is associated with risk of systemic progression in prostate cancer patients, and higher levels of TOP2A were found in hormone-resistant cases. To elucidate the mechanism by which high levels of TOP2A contribute to tumor progression we generated TOP2A overexpressing prostate cancer cell lines. We show that TOP2A promotes tumor aggressiveness by inducing chromosomal rearrangements of genes that contribute to a more invasive phenotype. Anti-androgen treatment alone was ineffective in killing TOP2A overexpressing cells due to activation of an androgen receptor network...
2015: PloS One
https://www.readbyqxmd.com/read/26408707/signatures-of-adverse-pathological-features-androgen-insensitivity-and-metastatic-potential-in-prostate-cancer
#16
Yuri Tolkach, Axel Merseburger, Thomas Herrmann, Markus Kuczyk, Jürgen Serth, Florian Imkamp
BACKGROUND/AIM: The genetic characterization of prostate tumors is important for personalized therapy. The aim of the present study was to investigate the role of previously described prostate cancer-related genes in the genetic characterization of prostate tumors. MATERIALS AND METHODS: Forty-two genes were selected for expression analysis (real time-quantitative polymerase chain reaction). One normal prostatic epithelial cell line and three standardized prostate cancer cell lines were used...
October 2015: Anticancer Research
https://www.readbyqxmd.com/read/26344095/spop-promotes-ubiquitination-and-degradation-of-the-erg-oncoprotein-to-suppress-prostate-cancer-progression
#17
Wenjian Gan, Xiangpeng Dai, Andrea Lunardi, Zhen Li, Hiroyuki Inuzuka, Pengda Liu, Shoreh Varmeh, Jinfang Zhang, Liang Cheng, Yin Sun, John M Asara, Andrew H Beck, Jiaoti Huang, Pier Paolo Pandolfi, Wenyi Wei
The ERG gene is fused to TMPRSS2 in approximately 50% of prostate cancers (PrCa), resulting in its overexpression. However, whether this is the sole mechanism underlying ERG elevation in PrCa is currently unclear. Here we report that ERG ubiquitination and degradation are governed by the Cullin 3-based ubiquitin ligase SPOP and that deficiency in this pathway leads to aberrant elevation of the ERG oncoprotein. Specifically, we find that truncated ERG (ΔERG), encoded by the ERG fusion gene, is stabilized by evading SPOP-mediated destruction, whereas prostate cancer-associated SPOP mutants are also deficient in promoting ERG ubiquitination...
September 17, 2015: Molecular Cell
https://www.readbyqxmd.com/read/26292628/one-pot-synthesis-of-podophyllotoxin-thiourea-congeners-by-employing-nh%C3%A2-so%C3%A2-h-nai-anticancer-activity-dna-topoisomerase-ii-inhibition-and-apoptosis-inducing-agents
#18
Nagula Shankaraiah, Niggula Praveen Kumar, Suresh Babu Amula, Shalini Nekkanti, Manish Kumar Jeengar, V G M Naidu, T Srinivasa Reddy, Ahmed Kamal
A facile one-pot method for the synthesis of novel podophyllotoxin-thiourea congeners has been developed by using NH2SO3H/NaI system. Interestingly, 4β-azido podophyllotoxin reduction with concomitant aryl isothiocyanates coupling under mild reaction conditions has been achieved. These compounds have been investigated for their in vitro cytotoxicity against A549, MDA MB-231, DU-145, LNCaP, and HGC-27 cancer cell lines. Some of the representative compounds have selectively exhibited cytotoxicity on DU-145 (human prostate cancer) cells and the most potent compound was 4a (IC50 of 0...
October 1, 2015: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/26286294/mitoxantrone-more-than-just-another-topoisomerase-ii-poison
#19
REVIEW
Benny J Evison, Brad E Sleebs, Keith G Watson, Don R Phillips, Suzanne M Cutts
Mitoxantrone is a synthetic anthracenedione originally developed to improve the therapeutic profile of the anthracyclines and is commonly applied in the treatment of breast and prostate cancers, lymphomas, and leukemias. A comprehensive overview of the drug's molecular, biochemical, and cellular pharmacology is presented here, beginning with the cardiotoxic nature of its predecessor doxorubicin and how these properties shaped the pharmacology of mitoxantrone itself. Although mitoxantrone is firmly established as a DNA topoisomerase II poison within mammalian cells, it is now clear that the drug interacts with a much broader range of biological macromolecules both covalently and noncovalently...
March 2016: Medicinal Research Reviews
https://www.readbyqxmd.com/read/26057090/synthesis-of-a-dna-targeting-nickel-ii-complex-with-testosterone-thiosemicarbazone-which-exhibits-selective-cytotoxicity-towards-human-prostate-cancer-cells-lncap
#20
Mok Piew Heng, Saravana Kumar Sinniah, Wuen Yew Teoh, Kae Shin Sim, Seik Weng Ng, Yoke Kqueen Cheah, Kong Wai Tan
Testosterone thiosemicarbazone, L and its nickel (II) complex 1 were synthesized and characterized by using FTIR, CHN, (1)H NMR, and X-ray crystallography. X-ray diffraction study confirmed the formation of L from condensation of testosterone and thiosemicarbazide. Mononuclear complex 1 is coordinated to two Schiff base ligands via two imine nitrogens and two tautomeric thiol sulfurs. The cytotoxicity of both compounds was investigated via MTT assay with cisplatin as positive reference standard. L is more potent towards androgen-dependent LNCaP (prostate) and HCT 116 (colon)...
2015: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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