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enzyme prodrug therapy

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https://www.readbyqxmd.com/read/27754187/sp-04-2-lcz-696-a-new-paradigm-shift-for-the-treatment-of-heart-failure
#1
ByungSu Yoo
Heart failure (HF) represents a significant healthcare issue because of its ever-increasing prevalence, poor prognosis and complex pathophysiology. The cornerstone of modern drug therapy in chronic HF is the inhibition of neurohormonal activation that plays a crucial role in the pathophysiology of HF development and progression and, more specifically, of the renin-angiotensin-aldosterone system (RAAS) and the sympathetic nervous system. LCZ696 is a first-in-class, angiotensin receptor NEP inhibitor (ARNI) that consists of a supramolecular complex of a molecule of the ARB valsartan in combination with a molecule of the NEP inhibitor prodrug AHU377 (also known as sacubitril)...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27749047/stimulus-responsive-prochelators-for-manipulating-cellular-metals
#2
Qin Wang, Katherine J Franz
Metal ions are essential for a wide range of physiological processes, but they can also be toxic if not appropriately regulated by a complex network of metal trafficking proteins. Intervention in cellular metal distribution with small-molecule or peptide chelating agents has promising therapeutic potential to harness metals to fight disease. Molecular outcomes associated with forming metal-chelate interactions in situ include altering the concentration and subcellular metal distribution, inhibiting metalloenzymes, enhancing the reactivity of a metal species to elicit a favorable biological response, or passivating the reactivity of a metal species to prevent deleterious reactivity...
October 17, 2016: Accounts of Chemical Research
https://www.readbyqxmd.com/read/27737561/translating-antibody-directed-enzyme-prodrug-therapy-adept-and-prospects-for-combination
#3
Surinder K Sharma, Kenneth D Bagshawe
The generation of cytotoxic drugs, selectively within tumours, from non-toxic prodrugs by targeted enzymes provides a powerful system for cancer therapy. In the form of Antibody directed enzyme prodrug therapy (ADEPT), this approach has shown feasibility in the clinic. Areas covered: Although numerous enzyme prodrug combinations have been reported over the last two decades, only the CPG2 ADEPT system has progressed to clinical trials. Using readily available components such as chemical antibody enzyme conjugate or recombinant multifunctional fusion protein, delivery of a specific enzyme to tumours, its elimination from non-tumour sites and prodrug activation has been achieved with therapeutic benefit in the clinic...
October 13, 2016: Expert Opinion on Biological Therapy
https://www.readbyqxmd.com/read/27706901/targeting-a-targeted-drug-an-approach-toward-hypoxia-activatable-tyrosine-kinase-inhibitor-prodrugs
#4
Claudia Karnthaler-Benbakka, Diana Groza, Bettina Koblmüller, Alessio Terenzi, Katharina Holste, Melanie Haider, Dina Baier, Walter Berger, Petra Heffeter, Christian R Kowol, Bernhard K Keppler
Tyrosine kinase inhibitors (TKIs), which have revolutionized cancer therapy over the past 15 years, are limited in their clinical application due to serious side effects. Therefore, we converted two approved TKIs (sunitinib and erlotinib) into 2-nitroimidazole-based hypoxia-activatable prodrugs. Kinetics studies showed very different stabilities over 24 h; however, fast reductive activation via E. coli nitroreductase could be confirmed for both panels. The anticancer activity and signaling inhibition of the compounds against various human cancer cell lines were evaluated in cell culture...
October 5, 2016: ChemMedChem
https://www.readbyqxmd.com/read/27687310/vectorized-gene-therapy-of-liver-tumors-proof-of-concept-of-tg4023-mva-fcu1-in-combination-with-flucytosine
#5
F Husseini, J-P Delord, C Fournel-Federico, J Guitton, P Erbs, M Homerin, C Halluard, C Jemming, C Orange, J-M Limacher, J-E Kurtz
BACKGROUND: TG4023 is a modified vaccinia virus Ankara (MVA) containing the yeast-originated transgene FCU1, expressing cytosine deaminase and uracil phosphoribosyltransferase enzymes that transform the prodrug flucytosine (5-FC) into cytotoxic 5-fluorouracil (5-FU) and 5-fluorouridine-5'-monophosphate (5-FUMP), respectively. This first-in-human study aimed to assess the maximum tolerated dose (MTD) of intra-tumoral (IT) TG4023 and the safety, feasibility, and proof-of-concept (PoC) of TG4023/5-FC combination to deliver high 5-FU concentrations in tumors...
September 29, 2016: Annals of Oncology: Official Journal of the European Society for Medical Oncology
https://www.readbyqxmd.com/read/27643822/new-perspectives-in-the-treatment-of-advanced-gastric-cancer-s-1-as-a-novel-oral-5-fu-therapy-in-combination-with-cisplatin
#6
Rolf Mahlberg, Sylvie Lorenzen, Peter Thuss-Patience, Volker Heinemann, Per Pfeiffer, Markus Möhler
Oral fluoropyrimidines have been available for more than 10 years. Capecitabine is well established in treating solid tumors in Europe. S-1 (Teysuno®), an oral formulation containing the 5-fluorouracil (5-FU) prodrug tegafur and the two enzyme modulators gimeracil and oteracil, has not been available in non-Asia countries until recently. In Japan, S-1 in combination with cisplatin is the recommended first-line treatment in patients with gastric cancer. In Europe, the first trials with S-1 were disappointing due to high unacceptable incidences of adverse events...
September 20, 2016: Chemotherapy
https://www.readbyqxmd.com/read/27643144/sp-04-2-lcz-696-a-new-paradigm-shift-for-the-treatment-of-heart-failure
#7
ByungSu Yoo
Heart failure (HF) represents a significant healthcare issue because of its ever-increasing prevalence, poor prognosis and complex pathophysiology. The cornerstone of modern drug therapy in chronic HF is the inhibition of neurohormonal activation that plays a crucial role in the pathophysiology of HF development and progression and, more specifically, of the renin-angiotensin-aldosterone system (RAAS) and the sympathetic nervous system. LCZ696 is a first-in-class, angiotensin receptor NEP inhibitor (ARNI) that consists of a supramolecular complex of a molecule of the ARB valsartan in combination with a molecule of the NEP inhibitor prodrug AHU377 (also known as sacubitril)...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27598485/human-cytochrome-p450-2w1-is-not-expressed-in-adrenal-cortex-and-is-only-rarely-expressed-in-adrenocortical-carcinomas
#8
Paola Nolé, Britt Duijndam, Adam Stenman, C Christofer Juhlin, Mikael Kozyra, Catharina Larsson, Magnus Ingelman-Sundberg, Inger Johansson
Human cytochome P450 2W1 (CYP2W1) enzyme is expressed in fetal colon and in colon tumors. The level of expression is higher in colon metastases than in the parent tumors and the enzyme is a possible drug target for treatment of colorectal cancer, as demonstrated in mouse xenograft studies. A previous study published in this journal reported that CYP2W1 is highly expressed in normal and transformed adrenal tissue. However, adrenal expression of CYP2W1 protein was not seen in previous studies in our research group...
2016: PloS One
https://www.readbyqxmd.com/read/27573048/current-treatments-for-advanced-melanoma-and-introduction-of-a-promising-novel-gene-therapy-for-melanoma-review
#9
Jae-Rim Heo, Nam-Hyung Kim, Jaejin Cho, Kyung-Chul Choi
Metastatic melanoma is a fatal form of skin cancer that has a tendency to proliferate more rapidly than any other solid tumor. Since 2010, treatment options for metastatic melanoma have been developed including chemotherapies, checkpoint inhibition immunotherapies, e.g., anti‑cytotoxic T‑lymphocyte antigen‑4 (CTLA‑4) and anti‑programmed death‑1 (PD‑1), and molecular-targeted therapies, e.g., BRAF and MEK inhibitors. These treatments have shown not only high response rates yet also side‑effects and limitations...
October 2016: Oncology Reports
https://www.readbyqxmd.com/read/27568924/preclinical-evaluation-of-a-mercaptobenzamide-and-its-prodrug-for-ncp7-targeted-inhibition-of-human-immunodeficiency-virus
#10
T L Hartman, L Yang, A N Helfrick, M Hassink, N I Shank, K George Rosenker, M T Scerba, M Saha, E Hughes, A Q Wang, X Xu, P Gupta, R W Buckheit, D H Appella
Although the effective use of highly active antiretroviral therapy results in the suppression of virus production in infected individuals, it does not eliminate the infection and low level virus production in cells harboring virus in sanctuary sites. Thus, the continued search for new antiretroviral agents with unique and different mechanisms of HIV inhibition remains critical, and compounds that can reduce the level of virus production from cells already infected with HIV, as opposed to preventing de novo infection, would be of great benefit...
October 2016: Antiviral Research
https://www.readbyqxmd.com/read/27558786/insight-into-prodrugs-of-quinolones-and-fluoroquinolones
#11
Prabodh Chandere Sharma, Mona Piplani, Monika Mittal, Rakesh Pahwa
Quinolones and fluoroquinolones are principal weapons against variety of bacterial infections and exert their antibacterial potential by interfering the activities of bacterial enzymes. As these agents are associated with some limitations, an important approach to overcome these major constraints is to prepare covalent derivatives, i.e. prodrugs. Prodrug design has been employed to improve the limitations of these drugs such as less aqueous solubility, poor absorption and distribution, toxicity, disagreeable taste, poor lipophilicity etc and for improving their pharmacological profile...
August 24, 2016: Infectious Disorders Drug Targets
https://www.readbyqxmd.com/read/27527860/her2-oncogene-transformation-enhances-5-aminolevulinic-acid-mediated-protoporphyrin-ix-production-and-photodynamic-therapy-response
#12
Xue Yang, Pratheeba Palasuberniam, Kenneth A Myers, Chenguang Wang, Bin Chen
Enhanced protoporphyrin IX (PpIX) production in tumors derived from the administration of 5-aminolevulinic acid (ALA) enables the use of ALA as a prodrug for photodynamic therapy (PDT) and fluorescence-guided tumor resection. Although ALA has been successfully used in the clinic, the mechanism underlying enhanced ALA-induced PpIX production in tumors is not well understood. Human epidermal growth receptor 2 (Her2, Neu, ErbB2) is a driver oncogene in human cancers, particularly breast cancers. Here we showed that, in addition to activating Her2/Neu cell signaling, inducing epithelial-mesenchymal transition and upregulating glycolytic enzymes, transfection of NeuT (a mutated Her2/Neu) oncogene in MCF10A human breast epithelial cells significantly enhanced ALA-induced PpIX fluorescence by elevating some enzymes involved in PpIX biosynthesis...
August 4, 2016: Oncotarget
https://www.readbyqxmd.com/read/27503607/protease-responsive-prodrug-with-aggregation-induced-emission-probe-for-controlled-drug-delivery-and-drug-release-tracking-in-living-cells
#13
Yong Cheng, Fujian Huang, Xuehong Min, Pengcheng Gao, Tianchi Zhang, Xinchun Li, Bifeng Liu, Yuning Hong, Xiaoding Lou, Fan Xia
Controlled drug delivery and real-time tracking of drug release in cancer cells are essential for cancer therapy. Herein, we report a protease-responsive prodrug (DOX-FCPPs-PyTPE, DFP) with aggregation-induced emission (AIE) characteristics for controlled drug delivery and precise tracking of drug release in living cells. DFP consists of three components: AIE-active tetraphenylethene (TPE) derivative PyTPE, functionalized cell penetrating peptides (FCPPs) containing a cell penetrating peptide (CPP) and a short protease-responsive peptide (LGLAG) that can be selectively cleaved by a cancer-related enzyme matrix metalloproteinase-2 (MMP-2), and a therapeutic unit (doxorubicin, DOX)...
September 6, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27494901/advanced-new-strategies-for-metastatic-cancer-treatment-by-therapeutic-stem-cells-and-oncolytic-virotherapy
#14
Geon-Tae Park, Kyung-Chul Choi
The field of therapeutic stem cell and oncolytic virotherapy for cancer treatment has rapidly expanded over the past decade. Oncolytic viruses constitute a promising new class of anticancer agent because of their ability to selectively infect and destroy tumor cells. Engineering of viruses to express anticancer genes and specific cancer targeting molecules has led to the use of these systems as a novel platform of metastatic cancer therapy. In addition, stem cells have a cancer specific migratory capacity, which is available for metastatic cancer targeting...
August 2, 2016: Oncotarget
https://www.readbyqxmd.com/read/27457630/utilizing-native-fluorescence-imaging-modeling-and-simulation-to-examine-pharmacokinetics-and-therapeutic-regimen-of-a-novel-anticancer-prodrug
#15
Jing-Hung Wang, Aaron N Endsley, Carol E Green, A C Matin
BACKGROUND: Success of cancer prodrugs relying on a foreign gene requires specific delivery of the gene to the cancer, and improvements such as higher level gene transfer and expression. Attaining these objectives will be facilitated in preclinical studies using our newly discovered CNOB-GDEPT, consisting of the produrg: 6-chloro-9-nitro-5-oxo-5H-benzo-(a)-phenoxazine (CNOB) and its activating enzyme ChrR6, which generates the cytotoxic product 9-amino-6-chloro-5H-benzo[a]phenoxazine-5-one (MCHB)...
2016: BMC Cancer
https://www.readbyqxmd.com/read/27453434/rational-design-of-an-akr1c3-resistant-analog-of-pr-104-for-enzyme-prodrug-therapy
#16
Alexandra M Mowday, Amir Ashoorzadeh, Elsie M Williams, Janine N Copp, Shevan Silva, Matthew R Bull, Maria R Abbattista, Robert F Anderson, Jack U Flanagan, Christopher P Guise, David F Ackerley, Jeff B Smaill, Adam V Patterson
The clinical stage anti-cancer agent PR-104 has potential utility as a cytotoxic prodrug for exogenous bacterial nitroreductases expressed from replicating vector platforms. However substrate selectivity is compromised due to metabolism by the human one- and two-electron oxidoreductases cytochrome P450 oxidoreductase (POR) and aldo-keto reductase 1C3 (AKR1C3). Using rational drug design we developed a novel mono-nitro analog of PR-104A that is essentially free of this off-target activity in vitro and in vivo...
September 15, 2016: Biochemical Pharmacology
https://www.readbyqxmd.com/read/27446484/dihydropyrimidine-dehydrogenase-is-a-prognostic-marker-for-mesenchymal-stem-cell-mediated-cytosine-deaminase-gene-and-5-fluorocytosine-prodrug-therapy-for-the-treatment-of-recurrent-gliomas
#17
Taemoon Chung, Juri Na, Young-Il Kim, Da-Young Chang, Young Il Kim, Hyeonjin Kim, Ho Eun Moon, Keon Wook Kang, Dong Soo Lee, June-Key Chung, Sung-Soo Kim, Haeyoung Suh-Kim, Sun Ha Paek, Hyewon Youn
We investigated a therapeutic strategy for recurrent malignant gliomas using mesenchymal stem cells (MSC), expressing cytosine deaminase (CD), and prodrug 5-Fluorocytosine (5-FC) as a more specific and less toxic option. MSCs are emerging as a novel cell therapeutic agent with a cancer-targeting property, and CD is considered a promising enzyme in cancer gene therapy which can convert non-toxic 5-FC to toxic 5-Fluorouracil (5-FU). Therefore, use of prodrug 5-FC can minimize normal cell toxicity. Analyses of microarrays revealed that targeting DNA damage and its repair is a selectable option for gliomas after the standard chemo/radio-therapy...
2016: Theranostics
https://www.readbyqxmd.com/read/27444284/in-vivo-imaging-of-tumour-xenografts-with-an-antibody-targeting-the-potassium-channel-kv10-1
#18
Joanna Napp, Luis A Pardo, Franziska Hartung, Lutz F Tietze, Walter Stühmer, Frauke Alves
The Kv10.1 (Eag1) voltage-gated potassium channel represents a promising molecular target for novel cancer therapies or diagnostic purposes. Physiologically, it is only expressed in the brain, but it was found overexpressed in more than 70 % of tumours of diverse origin. Furthermore, as a plasma membrane protein, it is easily accessible to extracellular interventions. In this study we analysed the feasibility of the anti-Kv10.1 monoclonal antibody mAb62 to target tumour cells in vitro and in vivo and to deliver therapeutics to the tumour...
October 2016: European Biophysics Journal: EBJ
https://www.readbyqxmd.com/read/27424910/theranostic-imaging-of-cancer-gene-therapy
#19
Thillai V Sekar, Ramasamy Paulmurugan
Gene-directed enzyme prodrug therapy (GDEPT) is a promising therapeutic approach for treating cancers of various phenotypes. This strategy is independent of various other chemotherapeutic drugs used for treating cancers where the drugs are mainly designed to target endogenous cellular mechanisms, which are different in various cancer subtypes. In GDEPT an external enzyme, which is different from the cellular proteins, is expressed to convert the injected prodrug in to a toxic metabolite, that normally kill cancer cells express this protein...
2016: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27390065/modification-of-existing-antibiotics-in-the-form-of-precursor-prodrugs-that-can-be-subsequently-activated-by-nitroreductases-of-the-target-pathogen
#20
Ayhan Çelik, Gülden Yetiş, Mehmet Ay, Tuğba Güngör
The use of existing antibiotics in the form of prodrug followed by activation using enzymes of pathogenic origin could be a useful approach for antimicrobial therapy. To investigate this idea, a common antibiotic, sulfamethoxazole has been redesigned in the form of a prodrug by simple functional group replacement. Upon reductive activation by a type I nitroreductase from a pathogen, the drug displayed enhanced antimicrobial capacity. This strategy could improve the efficacy and selectively of antibiotics and reduce the incidence of resistance...
August 15, 2016: Bioorganic & Medicinal Chemistry Letters
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