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https://www.readbyqxmd.com/read/28431282/the-role-of-pharmacologic-modulation-of-autophagy-on-anal-cancer-development-in-an-hpv-mouse-model-of-carcinogenesis
#1
Brooks L Rademacher, Kristina A Matkowskyj, Louise M Meske, Alexis Romero, Hana Sleiman, Evie H Carchman
Autophagy is an intracellular, catabolic process that maintains cellular health. We examined the response of pharmacologic modulation of autophagy in an HPV mouse model of anal carcinogenesis. K14E6/E7 mice were treated with the topical carcinogen DMBA weekly and assessed for tumors over 20 weeks. Concurrently, they were given either chloroquine or BEZ235, to inhibit or induce autophagy, respectively. Time to tumor onset was examined. Immunofluorescence (IF) was performed for LC3β and p62 to examine autophagy...
April 18, 2017: Virology
https://www.readbyqxmd.com/read/28427009/early-in-life-dietary-zinc-deficiency-and-supplementation-and-mammary-tumor-development-in-adulthood-female-rats
#2
Flávia R M da Silva, Tony F Grassi, Joyce R Zapaterini, Lucas T Bidinotto, Luis F Barbisan
Zinc deficiency during pregnancy and postnatal life can adversely increase risk of developing human diseases at adulthood. The present study was designed to evaluate whether dietary zinc deficiency or supplementation during the pregnancy, lactation and juvenile stages interferes in the development of mammary tumors induced by 7,12-dimethylbenzanthracene (DMBA) in female Sprague-Dawley (SD) rats. Pregnant female SD rats were allocated into three groups: zinc-adequate diet (ZnA - 35-mg/kg chow), zinc-deficient diet (ZnD - 3-mg/kg chow) or zinc-supplemented diet (ZnS - 180-mg/kg chow) during gestational day 10 (GD 10) until the litters' weaning...
April 1, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28420987/curcumin-ameliorates-cisplatin-induced-nephrotoxicity-and-potentiates-its-anticancer-activity-in-sd-rats-potential-role-of-curcumin-in-breast-cancer-chemotherapy
#3
Parveen Kumar, Chandana C Barua, Kunjbihari Sulakhiya, Rajeev Kumar Sharma
Breast malignant neoplastic disease is one of the most complex diseases, as it is a multifactorial disease in which virtually all the targets are instantly or indirectly inter-reliant on each other. Cisplatin (CIS), an inorganic antineoplastic agent is widely utilized in the treatment of various solid tumors including breast cancer. Despite everything, its clinical use is limited, due to ototoxicity, peripheral neuropathy, and nephrotoxicity. The present work was directed to assess the combined result of curcumin (CUR) and CIS in 7, 12-dimethyl benz[a]anthracene (DMBA) induced breast cancer in rats and the prevention of nephrotoxicity induced by the latter...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28416734/the-angiotensin-receptor-blocker-losartan-inhibits-mammary-tumor-development-and-progression-to-invasive-carcinoma
#4
Rhiannon Coulson, Seng H Liew, Angela A Connelly, Nicholas S Yee, Siddhartha Deb, Beena Kumar, Ana C Vargas, Sandra A O'Toole, Adam C Parslow, Ashleigh Poh, Tracy Putoczki, Riley J Morrow, Mariah Alorro, Kyren A Lazarus, Evie F W Yeap, Kelly L Walton, Craig A Harrison, Natalie J Hannan, Amee J George, Colin D Clyne, Matthias Ernst, Andrew M Allen, Ashwini L Chand
Drugs that target the Renin-Angiotensin System (RAS) have recently come into focus for their potential utility as cancer treatments. The use of Angiotensin Receptor Blockers (ARBs) and Angiotensin-Converting Enzyme (ACE) Inhibitors (ACEIs) to manage hypertension in cancer patients is correlated with improved survival outcomes for renal, prostate, breast and small cell lung cancer. Previous studies demonstrate that the Angiotensin Receptor Type I (AT1R) is linked to breast cancer pathogenesis, with unbiased analysis of gene-expression studies identifying significant up-regulation of AGTR1, the gene encoding AT1R in ER+ve/HER2-ve tumors correlating with poor prognosis...
March 21, 2017: Oncotarget
https://www.readbyqxmd.com/read/28415789/hmga2-translocation-induced-in-skin-tumorigenesis
#5
Yong Li, Xiang-Ying Pi, Kelsey Boland, Sonali Lad, Kelly Johnson, Catherine Verfaillie, Rebecca J Morris
Hmga2 protein, a transcription factor involved in chromatin architecture, is expressed chiefly during development, where it has many key biological functions. When expressed in adult tissues from in various organs, Hmga2 is always related to cancer development. The role of Hmga2 in skin tumorigenesis is, however, not yet understood. We demonstrated that Hmga2 can be found in non-transformed epidermis, specifically located to the membrane of keratinocytes (KCs) in epidermis. Ex vivo culture of KCs and development of skin carcinomas in DMBA and TPA mouse models was associated with translocation of the Hmga2 protein from the membrane into the nucleus, where Hmga2 induced its own expression by binding to the Hmga2 promoter...
March 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28402673/functionalized-lipid-polymer-hybrid-nanoparticles-mediated-co-delivery-of-methotrexate-aceclofenac-a-synergistic-effect-in-breast-cancer-with-improved-pharmacokinetics-attributes
#6
Neeraj K Garg, Rajeev K Tyagi, Gajanand Sharma, Ashay Jain, Bhupinder Singh, Sanyog Jain, O P Katare
Present study was aimed to co-encapsulate methotrexate (MTX) and aceclofenac (ACL) in fucose anchored lipid-polymer hybrid nanoparticles (Fu-LPHNPs) to achieving target specific and controlled delivery for developing therapeutic interventions against breast cancer. The effective combination therapy requires co-administration of drugs to achieving synergistic effect on tumor with minimum adverse effects. Present study investigates the potential of co-delivery of MTX & ACL through LPHNPs in MCF-7 and triple negative breast cancer cells (MDA-MB-231) to reduce the adverse effects...
April 12, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28398226/melatonin-reduces-angiogenesis-in-serous-papillary-ovarian-carcinoma-of-ethanol-preferring-rats
#7
Yohan Ricci Zonta, Marcelo Martinez, Isabel Cristina C Camargo, Raquel F Domeniconi, Luiz Antonio Lupi Júnior, Patricia Fernanda F Pinheiro, Russel J Reiter, Francisco Eduardo Martinez, Luiz Gustavo A Chuffa
Angiogenesis is a hallmark of ovarian cancer (OC); the ingrowth of blood vessels promotes rapid cell growth and the associated metastasis. Melatonin is a well-characterized indoleamine that possesses important anti-angiogenic properties in a set of aggressive solid tumors. Herein, we evaluated the role of melatonin therapy on the angiogenic signaling pathway in OC of an ethanol-preferring rat model that mimics the same pathophysiological conditions occurring in women. OC was chemically induced with a single injection of 7,12-dimethylbenz(a)anthracene (DMBA) under the ovarian bursa...
April 11, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28364601/pro-apoptotic-activity-of-nano-escheriosome-based-oleic-acid-conjugate-against-7-12-dimethylbenz-a-anthracene-dmba-induced-cutaneous-carcinogenesis
#8
Azmat Ali Khan
AIM: 2,6-Diisopropylphenol-oleic acid (2,6P-OLA) is an ester conjugate of oleic acid that has displayed a strong anticancer activity on different types of cancer cell lines (Khan et al., 2012). The present study is focused on the development of a nano-liposome-based approach for the delivery of 2,6P-OLA on 7,12-dimethylbenz(a)anthracene (DMBA) induced cutaneous papilloma in experimental mice. For effective and specific delivery of the conjugate to the tumor site, it was incorporated into escheriosome (EC); an Escherichia coli lipid nanoparticle...
March 29, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28359264/congenic-rats-with-higher-arylamine-n-acetyltransferase-2-activity-exhibit-greater-carcinogen-induced-mammary-tumor-susceptibility-independent-of-carcinogen-metabolism
#9
Marcus W Stepp, Mark A Doll, David J Samuelson, Mary Ann G Sanders, J Christopher States, David W Hein
BACKGROUND: Recent investigations suggest role(s) of human arylamine N-acetyltransferase 1 (NAT1) in breast cancer. Rat NAT2 is orthologous to human NAT1 and the gene products are functional homologs. We conducted in vivo studies using F344.WKY-Nat2 (rapid/slow) rats, congenic at rat Nat2 for high (rapid) and low (slow) arylamine N-acetyltransferase activity, to assess a possible role for rat NAT2 in mammary tumor susceptibility. METHODS: Mammary carcinogens, methylnitrosourea (MNU) and 7,12-dimethylbenzanthracene (DMBA) neither of which is metabolized by N-acetyltransferase, were administered to assess mammary tumors...
March 31, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28344868/langerhans-cells-and-nk-cells-cooperate-in-the-inhibition-of-chemical-skin-carcinogenesis
#10
Daniela Ortner, Christoph H Tripp, Kerstin Komenda, Sandrine Dubrac, Bernhard Zelger, Martin Hermann, Wolfgang Doppler, Piotr Z Tymoszuk, Louis Boon, Björn E Clausen, Patrizia Stoitzner
Tissue immunosurveillance is an important mechanism to prevent cancer. Skin treatment with the carcinogen 7,12-dimethylbenz(a)anthracene (DMBA), followed by the tumor promoter 12-O-tetra-decanoyl-phorbol-13-acetate (TPA), is an established murine model for squamous cell carcinoma (SCC). However, the innate immunological events occurring during the initiation of chemical carcinogenesis with DMBA remain elusive. Here, we discovered that natural killer (NK) cells and Langerhans cells (LC) cooperate to impair this oncogenic process in murine skin...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/28343014/natural-lipids-enriched-self-nano-emulsifying-systems-for-effective-co-delivery-of-tamoxifen-and-naringenin-systematic-approach-for-improved-breast-cancer-therapeutics
#11
Premjeet Singh Sandhu, Rajendra Kumar, Sarwar Beg, Sanyog Jain, Varun Kushwah, O P Katare, Bhupinder Singh
The nano-miceller drug delivery carriers of tamoxifen (TMX) having natural ingredients like polyunsaturated fatty acid (PUFA) with self-nano-emulsifying properties was developed with naringenin (NG) in a synergistic manner i.e. TMX-NG-SNEDDS. The optimized nano-formulation revealed complete drug release in 30 min and >80% permeation in 45 min. Superior cellular uptake potential (4.6-6.5-fold) of the TMX-NG-SNEDDS using Caco-2 cells while cytotoxicity study on MCF-7 cells indicated significant results (P<0...
March 23, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28335515/dehydroepiandrosterone-dhea-feeding-protects-liver-steatosis-in-obese-breast-cancer-rat-model
#12
Reza Hakkak, Andrea Bell, Soheila Korourian
Obesity is a major health problem in the US and globally. Obesity is associated with the risk of cardiovascular disease, type 2 diabetes, cancers, hyperlipidemia, and liver steatosis development. Dehydroepiandrosterone (DHEA) is a dietary supplement used as an anti-obesity supplement. Previously, we reported that DHEA feeding protects 7,12-dimethylbenz(a)anthracene (DMBA)-induced mammary tumors. The objectives of this study were to investigate the effects of obesity and DHEA feeding on liver steatosis, body weight gain, and serum DHEA, DHEA sulfate (DHEA-S), insulin-like growth factor-1 (IGF-1), and insulin-like growth factor binding protein-3 (IGFBP-3) levels...
March 20, 2017: Scientia Pharmaceutica
https://www.readbyqxmd.com/read/28335476/inhibition-of-neoplastic-transformation-and-chemically-induced-skin-hyperplasia-in-mice-by-traditional-chinese-medicinal-formula-si-wu-tang
#13
Mandy M Liu, Kevin M Huang, Steven Yeung, Andy Chang, Suhui Zhang, Nan Mei, Cyrus Parsa, Robert Orlando, Ying Huang
Exploring traditional medicines may lead to the development of low-cost and non-toxic cancer preventive agents. Si-Wu-Tang (SWT), comprising the combination of four herbs, Rehmanniae, Angelica, Chuanxiong, and Paeoniae, is one of the most popular traditional Chinese medicines for women's diseases. In our previous studies, the antioxidant Nrf2 pathways were strongly induced by SWT in vitro and in vivo. Since Nrf2 activation has been associated with anticarcinogenic effects, the purpose of this study is to evaluate SWT's activity of cancer prevention...
March 18, 2017: Nutrients
https://www.readbyqxmd.com/read/28330805/photodynamic-therapeutic-efficacy-of-symmetrical-diiodinated-squaraine-in-in-vivo-skin-cancer-models
#14
M S Soumya, D Devi Gayathri, K M Shafeekh, Suresh Das, Annie Abraham
BACKGROUND: Photodynamic therapy (PDT) has clinical approval for use as a minimally invasive therapeutic procedure that is able to exert selective cytotoxic activity toward malignant cells. The dye selected for our study, symmetrical diiodinated squaraine, is one of the newly developed photosensitizers. The study is designed to determine the efficacy of PDT mediated by symmetrical diiodinated squaraine in skin tumor induced Swiss albino mice. METHODS: Skin tumor was induced in mice with dimethyl benzanthracene (DMBA) and croton oil...
March 19, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28322331/targeted-disruption-of-tc-ptp-in-the-proliferative-compartment-augments-stat3-and-akt-signaling-and-skin-tumor-development
#15
Hyunseung Lee, Mihwa Kim, Minwoo Baek, Liza D Morales, Ik-Soon Jang, Thomas J Slaga, John DiGiovanni, Dae Joon Kim
Tyrosine phosphorylation is a vital mechanism that contributes to skin carcinogenesis. It is regulated by the counter-activities of protein tyrosine kinases (PTKs) and protein tyrosine phosphatases (PTPs). Here, we report the critical role of T-cell protein tyrosine phosphatase (TC-PTP), encoded by Ptpn2, in chemically-induced skin carcinogenesis via the negative regulation of STAT3 and AKT signaling. Using epidermal specific TC-PTP knockout (K14Cre.Ptpn2(fl/fl)) mice, we demonstrate loss of TC-PTP led to a desensitization to tumor initiator 7,12-dimethylbenz[a]anthracene (DMBA)-induced apoptosis both in vivo epidermis and in vitro keratinocytes...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28292553/low-dietary-n-6-n-3-polyunsaturated-fatty-acid-ratio-prevents-induced-oral-carcinoma-in-a-hamster-pouch-model
#16
Hsiu-Chuan Lee, An Liang, Yun-Ho Lin, Yu-Ru Guo, Shih-Yi Huang
Dietary fatty acid patterns have been linked to the prevalence of certain cancers, however in oral carcinoma is limited. Thus, we investigated the chemopreventive effects of various dietary n-6 and n-3 fatty acids in a 9,10-dimethyl-1,2-benz[a]-anthracene (DMBA)- and betel quid extract (BQE) -induced hamster oral cancer model. Thirty 6-week-old adult male hamsters were housed and divided into normal, low, and high dietary n-6 and n-3 fatty acid groups under DMBA + BQE treatment for 16 weeks. The right buccal pouch of all hamsters were evaluated by tumor number, volume, burden and selected inflammatory parameters...
March 9, 2017: Prostaglandins, Leukotrienes, and Essential Fatty Acids
https://www.readbyqxmd.com/read/28292018/vitis-vinifera-peel-and-seed-gold-nanoparticles-exhibit-chemopreventive-potential-antioxidant-activity-and-induce-apoptosis-through-mutant-p53-bcl-2-and-pan-cytokeratin-down-regulation-in-experimental-animals
#17
J Grace Nirmala, R T Narendhirakannan
Several studies suggest surface modifications of gold nanoparticles (AuNPs) by capping agents or surface coatings could play an important role in biological systems, and site directed delivery. The present study was carried out to assess the antioxidant and apoptotic activities of the Vitis vinifera peel and seed gold nanoparticles in experimentally induced cancer in Swiss albino mice. 12-dimethylbenz [a] anthracene (DMBA) (single application) and 12-O-tetradecanoylphorbol 13-acetate (TPA) (thrice a week) were applied on the dorsal area of the skin to induce skin papillomagenesis in Swiss albino mice for 16 weeks...
March 7, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28285967/prognostic-factors-in-mnu-and-dmba-induced-mammary-tumors-in-female-rats
#18
Antonieta Alvarado, Ana C Lopes, Ana I Faustino-Rocha, António M S Cabrita, Rita Ferreira, Paula A Oliveira, Bruno Colaço
Chemically-induced mammary tumors in rats by the carcinogens 1-methyl-1-nitrosourea- (MNU) and 7,12-dimethylbenz[a]anthracene (DMBA) are the most widely used models for studies related with human breast cancer. This study aimed to evaluate the immunoexpression of the prognostic factors estrogen receptor α (ERα), progesterone receptor (PR) and Ki-67, in MNU and DMBA-induced rat mammary tumors, in order to know the model that best suits to woman breast cancer. Twenty-eight MNU-induced and 16 DMBA-induced mammary tumors in virgin female Sprague-Dawley rats were analyzed...
February 24, 2017: Pathology, Research and Practice
https://www.readbyqxmd.com/read/28280387/ulva-lactuca-polysaccharides-prevent-wistar-rat-breast-carcinogenesis-through-the-augmentation-of-apoptosis-enhancement-of-antioxidant-defense-system-and-suppression-of-inflammation
#19
Gamal-Eldein F Abd-Ellatef, Osama M Ahmed, Eman S Abdel-Reheim, Abdel-Hamid Z Abdel-Hamid
BACKGROUND: Recently, several research studies have been focused on the isolation and function of the polysaccharides derived from different algal species, which revealed multiple biological activities such as antioxidant and antitumor activities. This study assesses the possible breast cancer chemopreventive properties of common seaweeds, sea lettuce, Ulva lactuca (ulvan) polysaccharides using in vitro bioassays on human breast cancer cell line (MCF-7) and an in vivo animal model of breast carcinogenesis...
2017: Breast Cancer: Targets and Therapy
https://www.readbyqxmd.com/read/28277539/epidermal-rac1-regulates-the-dna-damage-response-and-protects-from-uv-light-induced-keratinocyte-apoptosis-and-skin-carcinogenesis
#20
Jayesh Deshmukh, Ruth Pofahl, Ingo Haase
Non-melanoma skin cancer (NMSC) is the most common type of cancer. Increased expression and activity of Rac1, a small Rho GTPase, has been shown previously in NMSC and other human cancers; suggesting that Rac1 may function as an oncogene in skin. DMBA/TPA skin carcinogenesis studies in mice have shown that Rac1 is required for chemically induced skin papilloma formation. However, UVB radiation by the sun, which causes DNA damage, is the most relevant cause for NMSC. A potential role of Rac1 in UV-light-induced skin carcinogenesis has not been investigated so far...
March 9, 2017: Cell Death & Disease
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