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https://www.readbyqxmd.com/read/28300564/contrasting-roles-of-the-abcg2-q141k-variant-in-prostate-cancer
#1
Kathryn M Sobek, Jessica L Cummings, Dean J Bacich, Denise S O'Keefe
ABCG2 is a membrane transport protein that effluxes growth-promoting molecules, such as folates and dihydrotestosterone, as well as chemotherapeutic agents. Therefore it is important to determine how variants of ABCG2 affect the transporter function in order to determine whether modified treatment regimens may be necessary for patients harboring ABCG2 variants. Previous studies have demonstrated an association between the ABCG2 Q141K variant and overall survival after a prostate cancer diagnosis. We report here that in patients with recurrent prostate cancer, those who carry the ABCG2 Q141K variant had a significantly shorter time to PSA recurrence post-prostatectomy than patients homozygous for wild-type ABCG2 (P=0...
March 11, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28291330/cancer-cell-specific-mitochondria-targeted-drug-delivery-by-dual-ligand-functionalized-nanodiamonds-circumvent-drug-resistance
#2
Miu Shan Chan, Ling Sum Liu, Hoi Man Leung, Pik Kwan Lo
We demonstrate a nanotechnology approach for the development of cancer-cell-specific subcellular organelle-targeted drug nanocarriers based on photostable nanodiamonds (ND) functionalized with folic acid and mitochondrial localizing sequence (MLS) peptides. We showed that these multifunctional NDs not only distinguish between cancer cells and normal cells, and transport the loaded drugs across the plasma membrane of cancer cells, but also selectively deliver them to mitochondria and induce significant cytotoxicity and cell death compared with free Dox localized in lysosomes...
March 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28288183/maternal-use-of-drug-substrates-of-placental-transporters-and-the-effect-of-transporter-mediated-drug-interactions-on-the-risk-of-congenital-anomalies
#3
Aizati N A Daud, Jorieke E H Bergman, Monika P Oktora, Wilhelmina S Kerstjens-Frederikse, Henk Groen, Jens H Bos, Eelko Hak, Bob Wilffert
BACKGROUND: A number of transporter proteins are expressed in the placenta, and they facilitate the placental transfer of drugs. The inhibition of P-glycoprotein (P-gp) was previously found to be associated with an increase in the risk of congenital anomalies caused by drug substrates of this transporter. We now explore the role of other placental transporter proteins. METHODS: A population-based case-referent study was performed using cases with congenital anomalies (N = 5,131) from EUROCAT Northern Netherlands, a registry of congenital anomalies...
2017: PloS One
https://www.readbyqxmd.com/read/28288142/serine-hydroxymethyl-transferase-1-stimulates-pro-oncogenic-cytokine-expression-through-sialic-acid-to-promote-ovarian-cancer-tumor-growth-and-progression
#4
R Gupta, Q Yang, S K Dogra, N Wajapeyee
High-grade serous (HGS) ovarian cancer accounts for 90% of all ovarian cancer-related deaths. However, factors that drive HGS ovarian cancer tumor growth have not been fully elucidated. In particular, comprehensive analysis of the metabolic requirements of ovarian cancer tumor growth has not been performed. By analyzing The Cancer Genome Atlas mRNA expression data for HGS ovarian cancer patient samples, we observed that six enzymes of the folic acid metabolic pathway were overexpressed in HGS ovarian cancer samples compared with normal ovary samples...
March 13, 2017: Oncogene
https://www.readbyqxmd.com/read/28272412/multifunctional-nanographene-oxide-for-targeted-gene-mediated-thermochemotherapy-of-drug-resistant-tumour
#5
Yiping Zeng, Zhangyou Yang, Hong Li, Yuhui Hao, Cong Liu, Lin Zhu, Jing Liu, Binghui Lu, Rong Li
Drug resistance remains a major challenge for anticancer treatment, and one of the major mechanisms of drug resistance is the overexpression of drug efflux transporters in cancer. A new approach for defeating drug resistance is the use of a co-delivery strategy that utilizes small interfering RNA (siRNA) to silence the expression of efflux transporters together with a suitable anticancer drug for drug-resistant cells. In this work, multifunctional graphene capable of integrating multiple functions in one system was employed as a novel co-delivery system for siRNA and doxorubicin (Dox), as well as for the controlled release of intracellular pH-triggered and heat-triggered Dox...
March 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28263847/folic-acid-conjugated-pyropheophorbide-a-as-the-photosensitizer-tested-for-in-vivo-targeted-photodynamic-therapy
#6
Jin Wang, Qian Liu, Yuting Zhang, Huan Shi, Hui Liu, Wenjun Guo, Yanhong Ma, Weiqiang Huang, Zhangyong Hong
Photodynamic therapy (PDT) is a highly localized and minimally invasive cancer treatment modality with many important advantages, but the lack of ideal photosensitizers (PSs) greatly restricts its clinical utility. To develop new PSs with highly efficient singlet oxygen production and high tumor-localizing ability to reduce damage to healthy adjacent tissues, we conjugated folic acid (FA) with pyropheophorbide a (Pyro), a potent photosensitizer with a very high singlet oxygen quantum yield and a high extinction coefficient...
March 2, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28263813/ligand-decorated-click-polypeptide-derived-nanoparticles-for-targeted-drug-delivery-applications
#7
Mohiuddin A Quadir, Stephen W Morton, Lawrence B Mensah, Kevin Shopsowitz, Jeroen Dobbelaar, Nicole Effenberger, Paula T Hammond
A ligand decorated, synthetic polypeptide block copolymer platform with environment-responsive capabilities was designed. We evaluated the potential of this system to function as a polymersome for targeted-delivery of a systemic chemotherapy to tumors. Our system employed click chemistry to provide a pH-responsive polypeptide block that drives nanoparticle assembly, and a ligand (folic acid) conjugated PEG block that targets folate-receptor over-expressing cancer cells. These nanocarriers were found to encapsulate a high loading of conventional chemotherapeutics (e...
March 2, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28247889/uptake-of-silver-nanoparticles-by-dha-treated-cancer-cells-examined-by-surface-enhanced-raman-spectroscopy-in-a-microfluidic-chip
#8
Zhimin Zhai, Fengqiu Zhang, Xiangyu Chen, Jie Zhong, Gang Liu, Yangchao Tian, Qing Huang
This paper reports on the synthesis and application of biocompatible and sensitive SERS nanoparticles for the study of uptake of nanoparticles into living cells in a microfluidic chip through surface-enhanced Raman spectroscopy (SERS). The nanoparticles were fabricated as beta-cyclodextrin-coated silver nanoparticles (Ag@CD NPs) modified with para-aminothiophenol (p-ATP) and folic acid (FA) on the surface. The p-ATP molecules act as the Raman reporter while the FA tags have high affinity for folate receptors (FR) that are over-expressed on the surface cancerous cells, so that the nanoparticles can enter the cells and be monitored by the Raman reporter...
March 1, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28245646/polyvalent-folate-dendrimer-coated-iron-oxide-theranostic-nanoparticles-for-simultaneous-magnetic-resonance-imaging-and-precise-cancer-cell-targeting
#9
Duy Luong, Samaresh Sau, Prashant Kesharwani, Arun K Iyer
The low therapeutic index of conventional chemotherapy along with poor prognosis of patients diagnosed with metastatic cancers are prompting clinicians to adopt newer strategies to simultaneously detect cancer-lesions at an early stage and to precisely deliver anticancer drugs to tumor sites. In this study, we employed a novel strategy to engineer a polyvalent theranostic nanocarrier consisting of super-paramagnetic iron oxide nanoparticle core (SPIONs) decorated with folic acid-polyamidoamine dendrimers surface (FA-PAMAM)...
February 28, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28238138/dual-wavelength-triggered-gold-nanorods-for-anticancer-treatment
#10
Dennis B Pacardo, Frances S Ligler, Zhen Gu
Gold nanomaterials with light-responsive properties can be exploited as light-triggered delivery vehicles to enhance the therapeutic efficacy of anticancer drugs. Additionally, different wavelengths of light can be utilized to achieve the combined effects of light-triggered release of therapeutics and light-induced localized heating, which results in improved anticancer efficacy. Herein, we describe methods to develop gold nanorod (AuNR) complexes that provide drug delivery or photothermal therapy when activated by ultraviolet (UV) or near-infrared (NIR) wavelengths of light, respectively...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28231500/silver-nanoparticle-embedded-graphene-oxide-methotrexate-for-targeted-cancer-treatment
#11
Raj Kumar Thapa, Jae Hee Kim, Jee-Heon Jeong, Beom Soo Shin, Han-Gon Choi, Chul Soon Yong, Jong Oh Kim
Combination therapies are widely investigated cancer treatment modalities. Carbon based systems such as graphene oxide (GO), plasmonic nanoparticles such as silver nanoparticles (AgNPs), and the folate analog, methotrexate (MTX), have been separately studied for their potential anticancer effects. In this study, we combined these systems to develop AgNPs-embedded GO with conjugated MTX (MTX-GO/AgNPs) and studied their folate receptor-targeted anticancer effects. Results revealed successful formation of AgNPs on GO along with MTX conjugation as suggested by UV/visible, TEM, AFM, FTIR, and XRD analysis...
February 13, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28193559/dual-functional-mesoporous-silicon-nanoparticles-enhance-the-radiosensitivity-of-vpa-in-glioblastoma
#12
Hailong Zhang, Wei Zhang, Yong Zhou, Yuhua Jiang, Shupeng Li
Radiotherapy is a critical strategy and standard adjuvant approach to glioblastoma treatment. One of the major challenges facing radiotherapy is to minimize radiation damage to normal tissue without compromising therapeutic effects on cancer cells. Various agents and numerous approaches have been developed to improve the therapeutic index of radiotherapy. Among them, radiosensitizers have attracted much attention because they selectively increase susceptibility of cancer cells to radiation and thus enhance biological effectiveness of radiotherapy...
April 2017: Translational Oncology
https://www.readbyqxmd.com/read/28192920/diagnosis-therapy-integrative-systems-based-on-magnetic-rna-nanoflowers-for-co-drug-delivery-and-targeted-therapy
#13
Yingshu Guo, Shuang Li, Yujie Wang, Shusheng Zhang
This study was to develop a codrug delivery system for targeting cancer therapy based on magnetic RNA nanoflowers (RNA NF). Compared with traditional nucleic acid structure, convenient separation can be achieved by introducing magnetic nanoparticle (MNP) into RNA NF. Folic acid (FA) modified MNP/RNA NF (FA/MNP/RNA NF) was used as a targeting nanocarrier with excellent biocompatibility to overcome the nonselectivity of MNP/RNA NF. And then, anticancer drug doxorubicin (DOX) and photosensitizer 5, 10, 15, 20-tetrakis (1-methylpyridinium-4-yl) porphyrin (TMPyP4) binding with RNA NF were used as codrug cargo models...
February 8, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28191959/mitoxantrone-and-folate-tpgs2k-conjugate-hybrid-micellar-aggregates-to-circumvent-toxicity-and-enhance-efficiency-for-breast-cancer-therapy
#14
Nida El Islem Guissi, Huipeng Li, Yurui Xu, Farouk Semcheddine, Minglei Chen, Zhigui Su, Qineng Ping
Mitoxantrone (MTO) is a potent drug used to treat breast cancer; however, efforts to expand its clinical applicability have been restricted because of its high risk for cardiotoxicity. In this study, we successfully conjugated MTO or folic acid (FA) to a synthesized D-α-tocopheryl polyethylene glycol 2000 succinate (TPGS2k), herein, shortened to MCT and FCT, respectively. The two produced conjugates could self-assemble to form MCT micelles or MCT/FCT mixed micelles (FMCT) aiming to lower systemic toxicity, enhance entrapment efficiency, and provide a platform for targeted delivery...
February 24, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28168180/association-between-nutrient-intake-and-metabolic-syndrome-in-patients-with-colorectal-cancer
#15
Hee-Sook Lim, Eung-Jin Shin, Jeong-Won Yeom, Yoon-Hyung Park, Soon-Kyung Kim
The purpose of this study was to investigate the difference of nutritional status according to metabolic syndrome in colorectal cancer patients. The subjects were divided into 2 groups (metabolic syndrome group and normal group) according to the presence or absence of metabolic syndrome in 143 patients diagnosed with colorectal cancer, and their lifestyle and nutritional status were analyzed. Recall method was used for the dietary survey, and metabolic syndrome was defined as the presence of 3 or more of waist circumference, fasting blood glucose, triglyceride, high-density lipoprotein (HDL)-cholesterol, and blood pressure...
January 2017: Clinical Nutrition Research
https://www.readbyqxmd.com/read/28155935/folate-binding-protein-therapeutic-natural-nanotechnology-for-folic-acid-methotrexate-and-leucovorin
#16
Rachel L Merzel, Sarah M Boutom, Junjie Chen, Carolina Frey, Kerby Shedden, E Neil G Marsh, Mark M Banaszak Holl
Blood serum proteins play a critical role in the transport, biodistribution, and efficacy of systemically-delivered therapeutics. Here, we have investigated the concentration- and ligand-dependent aggregation of folate binding protein (FBP), focusing in particular on folic acid, an important vitamin and targeting agent; methotrexate, an antifolate drug used to treat cancer and rheumatoid arthritis; and leucovorin which is used to decrease methotrexate toxicity. We employed atomic force microscopy to characterize, on a particle-by-particle basis, the volumes of the FBP nanoparticles that form upon ligand binding...
February 3, 2017: Nanoscale
https://www.readbyqxmd.com/read/28153257/a-supramolecular-material-for-dual-modal-imaging-and-targeted-cancer-therapy
#17
Shanyue Guan, Ruizheng Liang, Chunyang Li, Min Wei
Recently, how to design a formulation system with simultaneous diagnosis and therapy toward cancer has attracted tremendous attention. Herein, a supramolecular material was prepared via a facile method by the co-intercalation of folic acid (FA) and doxorubicin (DOX) into the gallery of Gd(3+)-doped layered double hydroxides (LDHs), followed by surface adsorption of fluorescein isothiocyanate (FITC). This supramolecular agent was proved to exhibit excellent magnetic resonance imaging (MRI) and fluorescence imaging (FI) behavior, as well as chemotherapy toward cancer (KB cell)...
April 1, 2017: Talanta
https://www.readbyqxmd.com/read/28152548/high-folic-acid-diet-enhances-tumour-growth-in-pymt-induced-breast-cancer
#18
Mariann Fagernæs Hansen, Sarah Østrup Jensen, Ernst-Martin Füchtbauer, Pia M Martensen
BACKGROUND: The B-vitamin folate is among the most studied bioactive food compound, and a dietary intake meeting the daily requirements has been found to reduce the risk of cancer and cardiovascular diseases as well as preventing neural tube defects during fetal development. Several countries have therefore introduced dietary fortification with folic acid. However, clinical and animal studies suggest that folic acid has a dual role in cancer development. METHODS: During the period of initial tumour progression, MMTV-PyMT (MMTV-polyoma virus middle T) transgenic mice were fed with normal diet and high folic acid diet...
March 14, 2017: British Journal of Cancer
https://www.readbyqxmd.com/read/28150350/nutrient-intakes-and-compliance-with-nutrient-recommendations-in-children-aged-1-4-years-in-ireland
#19
J Walton, L Kehoe, B A McNulty, A P Nugent, A Flynn
BACKGROUND: The early childhood years represent a period of rapid growth and development characterised by unique requirements for energy and individual nutrients. METHODS: The present study uses data from the National Pre-School Nutrition Survey, a nationally representative sample of Irish children (1-4 years) (n = 500), aiming to estimate energy and nutrient intakes across age and compliance with recommendations (UK and European). A 4-day weighed food-record was used to collect dietary data and statistical modelling (National Cancer Institute method) was applied to estimate usual nutrient intakes...
February 2, 2017: Journal of Human Nutrition and Dietetics: the Official Journal of the British Dietetic Association
https://www.readbyqxmd.com/read/28142123/plasmonic-nanocarrier-grid-enhanced-raman-sensor-for-studies-of-anticancer-drug-delivery
#20
Katarzyna Kurzątkowska, Ty Santiago, Maria Hepel
Targeted drug delivery systems using nanoparticle nanocarriers offer remarkable promise for cancer therapy by discriminating against devastating cytotoxicity of chemotherapeutic drugs to healthy cells. To aid in the development of new drug nanocarriers, we propose a novel plasmonic nanocarrier grid-enhanced Raman sensor which can be applied for studies and testing of drug loading onto the nanocarriers, attachment of targeting ligands, dynamics of drug release, assessment of nanocarrier stability in biological environment, and general capabilities of the nanocarrier...
May 15, 2017: Biosensors & Bioelectronics
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