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Thyroid resistance

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https://www.readbyqxmd.com/read/29790111/potential-of-the-dual-mtor-kinase-inhibitor-azd2014-to-overcome-paclitaxel-resistance-in-anaplastic-thyroid-carcinoma
#1
Zorica Milošević, Jasna Banković, Jelena Dinić, Chrisiida Tsimplouli, Evangelia Sereti, Miodrag Dragoj, Verica Paunović, Zorka Milovanović, Marija Stepanović, Nikola Tanić, Kostantinos Dimas, Milica Pešić
PURPOSE: Anaplastic thyroid carcinoma (ATC) is an aggressive, chemo-resistant malignancy. Chemo-resistance is often associated with changes in activity of the RAS/MAPK/ERK and PI3K/AKT/mTOR pathways and/or a high expression of ATP binding cassette (ABC) transporters, such as P-glycoprotein (P-gp) and breast cancer resistance protein (BCRP). To assess the therapeutic efficacy in ATC of a combination of the dual mTOR kinase inhibitor vistusertib (AZD2014) and paclitaxel (PTX), we generated a new cell line (Rho-) via the selection of human thyroid carcinoma 8505C cells that exhibit a low accumulation of rhodamine 123, which serves as a P-gp and BCRP substrate...
May 22, 2018: Cellular Oncology (Dordrecht)
https://www.readbyqxmd.com/read/29785209/acute-suppurative-thyroiditis-caused-by-thyroid-papillary-carcinoma-in-the-right-thyroid-lobe-of-a-healthy-woman
#2
Hazuki Otani, Masakazu Notsu, Sayo Koike, Miwa Morita, Masahiro Yamamoto, Mika Yamauchi, Takahumi Fuchiwaki, Ichiro Morikura, Noriaki Aoi, Hideyuki Kawauchi, Teruaki Iwabashi, Asuka Araki, Noriyoshi Ishikawa, Riruke Maruyama, Toshitsugu Sugimoto
Background: The thyroid gland is resistant to microbial infection, because of its organ characteristics such as encapsulation, iodine content, and rich blood supply. Therefore, acute suppurative thyroiditis (AST), as a bacterial infection of the thyroid gland, is rarely seen. AST typically takes places on the left side the neck region in children, because of the coincidence of the left piriform sinus fistula, as a most common route of infection. AST is also usually seen in immunocompromised hosts...
2018: Thyroid Research
https://www.readbyqxmd.com/read/29784871/effect-of-maternal-hypothyroidism-during-pregnancy-on-insulin-resistance-lipid-accumulation-and-mitochondrial-dysfunction-in-skeletal-muscle-of-fetal-rats
#3
Tongjia Xia, Xue Zhang, Youmin Wang, Datong Deng
This study aimed to investigate the effect of maternal hypothyroidism during pregnancy on thyroid function of the fetal rat. Female Sprague-Dawley rats were randomized into two groups. PTU group received propylthiouracil (PTU) in drinking water for 6 weeks (n = 90), normal group received drinking normal water (n = 50). The pregnant rats were obtained and had a cesarean-section to get at gestational age of 8.5 d, 13d and 21 d, following blood samples and skeletal muscle were obtained from fetal rats...
May 21, 2018: Bioscience Reports
https://www.readbyqxmd.com/read/29780561/triple-action-pt-iv-derivatives-of-cisplatin-a-new-class-of-potent-anticancer-agents-that-overcome-resistance
#4
Emanuele Petruzzella, Roman Sirota, Irene Solazzo, Valentina Gandin, Dan Gibson
A series of triple action Pt(iv) prodrugs was designed to test the hypothesis that multi-action compounds, where each bioactive moiety intervenes in several cellular processes, might be more effective than a single agent at killing cancer cells. In particular, "triple action" Pt(iv) derivatives of cisplatin, where the axial ligands are inhibitors of cyclooxygenase (COXi), histone deacetylase (HDACi) or pyruvate dehydrogenase kinase (PDKi) were developed. All compounds, ctc-[Pt(NH3 )2 (COXi)(PDKi)Cl2 ], ctc-[Pt(NH3 )2 (COXi)(HDACi)Cl2 ] and ctc-[Pt(NH3 )2 (HDACi)(PDKi)Cl2 ], where COXi = aspirin or ibuprofen, PDKi = dichloroacetate and HDACi = valproate or phenylbutyrate, were significantly more cytotoxic than cisplatin against all cell lines of an in-house panel of human cancer cells...
May 14, 2018: Chemical Science
https://www.readbyqxmd.com/read/29779013/treatment-of-sec62-over-expressing-tumors-by-thapsigargin-and-trifluoperazine
#5
Christina Körbel, Maximilian Linxweiler, Florian Bochen, Silke Wemmert, Bernhard Schick, Markus Meyer, Hans Maurer, Michael D Menger, Richard Zimmermann, Markus Greiner
Treatment with analogues of the SERCA-inhibitor Thapsigargin is a promising new approach for a wide variety of cancer entities. However, our previous studies on various tumor cells suggested resistance of SEC62 over-expressing tumors to this treatment. Therefore, we proposed the novel concept that e.g. lung-, prostate-, and thyroid-cancer patients should be tested for SEC62 over-expression, and developed a novel therapeutic strategy for a combinatorial treatment of SEC62 over-expressing tumors. The latter was based on the observations that treatment of SEC62 over-expressing tumor cells with SEC62-targeting siRNAs showed less resistance to Thapsigargin as well as a reduction in migratory potential and that the siRNA effects can be mimicked by the Calmodulin antagonist Trifluoperazine...
May 19, 2018: Biomolecular Concepts
https://www.readbyqxmd.com/read/29778669/thyroid-status-in-premenopausal-and-postmenopausal-women-a-biochemical-study-on-insulin-resistance-in-non-obese-overweight-and-obese-type-2-diabetics
#6
Rajendran Jayanthi, Abu Raghavan Srinivasan, Gopal Niranjan
BACKGROUND: Insulin resistance with altered thyroid status in women is observed in type 2 diabetics and varies with advancing age and estrogen profile. We compared thyroid status between premenopausal and postmenopausal women in obese, non obese and overweight type 2 diabetes. METHODOLOGY: We included 301type 2 diabetics who were segregated into premenopausal (n = 100) 33.2% and postmenopausal (n = 201) 66.8% among three sub groups (Non obese, overweight and Obese)...
May 10, 2018: Diabetes & Metabolic Syndrome
https://www.readbyqxmd.com/read/29774792/hypofractionated-radiotherapy-is-superior-to-conventional-fractionation-in-an-orthotopic-model-of-anaplastic-thyroid-cancer
#7
Ayman J Oweida, Andy Phan, Benjamin Vancourt, Tyler Robin, Mohammad K Hararah, Shilpa Bhatia, Dallin Milner, Shelby Lennon, Laura Pike, David Raben, Bryan R Haugen, Nikita Pozdeyev, Rebecca E Schweppe, Sana D Karam
Anaplastic thyroid cancer is an aggressive and highly lethal disease with poor outcomes and resistance to therapy. Despite multimodality treatment including radiation therapy and chemotherapy, response rates remain below 15% with a median time to progression of less than 3 months. Recent advances in radiotherapy delivery and gene-expression profiling may help guide patient selection for personalized therapy. The purpose of this study was to characterize the response to radiation in a panel of ATC cell lines and to test alternative radiotherapy fractionation schedules for overcoming radioresistance...
May 18, 2018: Thyroid: Official Journal of the American Thyroid Association
https://www.readbyqxmd.com/read/29773172/seleno-l-methionine-and-l-ascorbic-acid-differentiate-the-biological-activity-of-doxorubicin-and-its-metal-complexes-as-a-new-anticancer-drugs-candidate
#8
Marzena Matejczyk, Grzegorz Świderski, Renata Świsłocka, Stanisław Józef Rosochacki, Włodzimierz Lewandowski
The most important problems of anti-cancer therapy include the toxicity of the drugs applied to healthy cells and the multi-drug cells resistance to chemotherapeutics. One of the most commonly used anticancer drugs is doxorubicin (DOX) used to treat certain leukemias and non-Hodgkin's lymphomas, as well as bladder, breast, stomach, lung, ovarian, thyroid, multiple myeloma and other cancers. Preliminary studies showed that metal complex with DOX improve its cytostatic activity with changes in their molecular structure and distribution of electrons, resulting in a substantial change of its biological activity (including antitumor activity)...
July 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29768692/prevalence-of-subclinical-hypothyroidism-in-obese-children-or-adolescents-and-association-between-thyroid-hormone-and-the-components-of-metabolic-syndrome
#9
Hye Young Jin
AIM: Subclinical hypothyroidism is defined as elevated thyroid-stimulating hormone (TSH) levels with the normal concentrations of thyroxine (T4) or free thyroxine (fT4), and its clinical significance is unclear. The purpose of this study is to investigate the prevalence of subclinical hypothyroidism in children and adolescents and determine the relationship between lipid profiles, insulin resistance and thyroid hormones. METHODS: A retrospective, cross-sectional study was performed using data from a subset of the KNHANES VI...
May 16, 2018: Journal of Paediatrics and Child Health
https://www.readbyqxmd.com/read/29760048/tipifarnib-inhibits-hras-driven-dedifferentiated-thyroid-cancers
#10
Brian R Untch, Vanessa Dos Anjos, Maria E R Garcia-Rendueles, Jeffrey A Knauf, Gnana P Krishnamoorthy, Mahesh Saqcena, Umeshkumar K Bhanot, Nicholas D Socci, Alan L Ho, Ronald Ghossein, James A Fagin
Of the three RAS oncoproteins, only HRAS is delocalized and inactivated by farnesyltransferase inhibitors (FTI), an approach yet to be exploited clinically. In this study, we treat mice bearing Hras-driven poorly differentiated and anaplastic thyroid cancers (Tpo-Cre/HrasG12V/p53flox/flox) with the FTI tipifarnib. Treatment caused sustained tumor regression and increased survival; however, early and late resistance was observed. Adaptive reactivation of RAS-MAPK signaling was abrogated in vitro by selective RTK (i...
May 14, 2018: Cancer Research
https://www.readbyqxmd.com/read/29757257/mtor-pathway-in-papillary-thyroid-carcinoma-different-contributions-of-mtorc1-and-mtorc2-complexes-for-tumor-behavior-and-slc5a5-mrna-expression
#11
Catarina Tavares, Catarina Eloy, Miguel Melo, Adriana Gaspar da Rocha, Ana Pestana, Rui Batista, Luciana Bueno Ferreira, Elisabete Rios, Manuel Sobrinho Simões, Paula Soares
The mammalian target of rapamycin (mTOR) pathway is overactivated in thyroid cancer (TC). We previously demonstrated that phospho-mTOR expression is associated with tumor aggressiveness, therapy resistance, and lower mRNA expression of SLC5A5 in papillary thyroid carcinoma (PTC), while phospho-S6 (mTORC1 effector) expression was associated with less aggressive clinicopathological features. The distinct behavior of the two markers led us to hypothesize that mTOR activation may be contributing to a preferential activation of the mTORC2 complex...
May 13, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29749329/is-celiac-disease-misdiagnosed-in-children-with-functional-constipation
#12
Sezin Akman, Özlem Şahaloğlu, Ceyhun Dalkan, Nerin Nadir Bahçeciler, Çiğdem Arıkan
BACKGROUND/AIMS: Functional constipation is one of the common problems in childhood, and it comprises approximately 5% of the pediatric outpatient clinical applications. On the other hand, celiac disease (CD) is an immune enteropathy with the prevalence between 1/150 and 1/200. In addition to the classical symptoms of the disease such as diarrhea and weight loss, the incidence of atypical symptoms is increasing. This study aims to determine the prevalence of CD in patients with chronic constipation...
March 2018: Turkish Journal of Gastroenterology: the Official Journal of Turkish Society of Gastroenterology
https://www.readbyqxmd.com/read/29748035/direct-correlation-between-serum-homocysteine-level-and-insulin-resistance-index-in-patients-with-subclinical-hypothyroidism-does-subclinical-hypothyroidism-increase-the-risk-of-diabetes-and-cardio-vascular-disease-together
#13
Anahita Ebrahimpour, Mostafa Vaghari-Tabari, Durdi Qujeq, Soheila Moein, Zoleikha Moazezi
BACKGROUND: Subclinical hypothyroidism known as mild thyroid disorder without significant sign and symptoms. The correlation between subclinical hypothyroidism and some of cardiovascular disease risk factors such as serum lipids, homocysteine levels and also insulin resistance index is not well established and the current study was conducted to clarify this issue. METHODS AND MATERIALS: Seventy four patients with mild elevation in levels of thyroid stimulating hormone (TSH) along with normal levels of T3 and T4 were selected as patients group and 74 age and sex matched individuals were selected as healthy control group...
May 5, 2018: Diabetes & Metabolic Syndrome
https://www.readbyqxmd.com/read/29747691/benign-thyroid-nodule-unresponsive-to-radiofrequency-ablation-treated-with-laser-ablation-a-case-report
#14
Silvia Oddo, Margherita Balestra, Lara Vera, Massimo Giusti
BACKGROUND: Radiofrequency ablation and laser ablation are safe and effective techniques for reducing thyroid nodule volume, neck symptoms, and cosmetic complaints. Therapeutic success is defined as a nodule reduction > 50% between 6 and 12 months after the procedure, but a percentage of nodules inexplicably do not respond to thermal ablation. CASE PRESENTATION: We describe the case of a young Caucasian woman with a solid benign thyroid nodule who refused surgery and who had undergone radiofrequency ablation in 2013...
May 11, 2018: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/29743166/exploiting-insights-on-the-ret-receptor-for-personalized-cancer-medicine
#15
Lois M Mulligan
The focus of precision cancer medicine is the use of patient genetic signatures to predict disease occurrence and course and tailor approaches to individualized treatment to improve patient outcomes. The RET receptor tyrosine kinase represents a paradigm for the power of personalized cancer management to change cancer impact and improve quality of life. Oncogenic activation of RET occurs through several mechanisms including activating mutations and increased or aberrant expression. Activating RET mutations found in the inherited cancer syndrome multiple endocrine neoplasia 2 permit early diagnosis, predict disease course, and guide disease management to optimize patient survival...
May 9, 2018: Endocrine-related Cancer
https://www.readbyqxmd.com/read/29738997/ultrasound-requested-by-general-practitioners-or-for-symptoms-unrelated-to-the-thyroid-gland-may-explain-higher-prevalence-of-thyroid-nodules-in-females
#16
Ana Germano, Willian Schmitt, Pedro Almeida, Rui Mateus-Marques, Valeriano Leite
BACKGROUND: A higher prevalence of thyroid nodules/carcinoma in females is well-known from the literature. The reasons for this difference are not fully explained. We intended to assess gender variation in the referral for ultrasound-guided fine needle aspiration (FNA) of thyroid nodules, to study reasons for gender referral differences, and to assess differences in nodules characteristics between genders. METHODS: Included were 272 consecutive patients, with 290 nodules submitted to FNA...
May 3, 2018: Clinical Imaging
https://www.readbyqxmd.com/read/29737325/the-mek1-2-inhibitor-azd6244-sensitizes-braf-mutant-thyroid-cancer-to-vemurafenib
#17
Hao Song, Jinna Zhang, Liang Ning, Honglai Zhang, Dong Chen, Xuelong Jiao, Kejun Zhang
BACKGROUND [i]BRAF[/i]V600E mutation occurs in approximately 45% of papillary thyroid cancer (PTC) cases, and 25% of anaplastic thyroid cancer (ATC) cases. Vemurafenib/PLX4032, a selective BRAF inhibitor, suppresses extracellular signal-regulated kinase kinase/extracellular signal-regulated kinase 1/2 (MEK/ERK1/2) signaling and shows beneficial effects in patients with metastatic melanoma harboring the [i]BRAFV600E[/i] mutation. However, the response to vemurafenib is limited in BRAF-mutant thyroid cancer. The present study evaluated the effect of vemurafenib in combination with the selective MEK1/2 inhibitor AZD6244 on cell survival and explored the mechanism underlying the combined effect of vemurafenib and AZD6244 on thyroid cancer cells harboring BRAFV600E...
May 8, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29733070/utilidad-del-%C3%A3-ndice-de-resistencia-obtenido-por-ultrasonido-doppler-en-n%C3%A3-dulos-tiroideos-de-caracter%C3%A3-sticas-ecogr%C3%A3-ficas-malignas
#18
Ángel Fernando Butrón-García, Mario Méndez-García
Introducción: La patología nodular tiroidea tiene alta prevalencia en la población general. Su diagnóstico se ha incrementado con el Doppler, con el cual se pueden detectar características sugerentes de malignidad, como elevación de los índices de resistencia y pulsatilidad. Objetivo: Evaluar la correlación de un índice de resistencia alto y los hallazgos histopatológicos en pacientes con sospecha ecográfica de nódulos tiroideos malignos. Método: Estudio prospectivo, observacional, transversal y analítico de pruebas diagnósticas, en el Hospital de Especialidades 25, Monterrey, Nuevo León...
2018: Gaceta Médica de México
https://www.readbyqxmd.com/read/29729151/subclinical-hypothyroidism-in-patients-with-non-alcoholic-fatty-liver-disease-at-the-background-of-carbohydrate-metabolism-disorders
#19
Snizhana V Feisa, Ivan V Chopei
OBJECTIVE: Introduction: The prevalence of non-alcoholic fatty liver disease (NAFLD) is 25-30% in the general population and more than 75% among patients with carbohydrate metabolism disorders. One in six patients with NAFLD has concomitant subclinical hypothyroidism. The aim is to compare lipid and carbohydrate metabolism states in patients with NAFLD depending on the functional state of the thyroid gland. PATIENTS AND METHODS: Materials and methods:215 patients with NAFLD and type 2 diabetes mellitus (T2-DM) or pre-diabetes (PD) were involved in study and devided into 6 groups according to the functional state of the thyroid gland...
2018: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/29725017/establishment-and-validation-of-the-scoring-system-for-preoperative-prediction-of-central-lymph-node-metastasis-in-papillary-thyroid-carcinoma
#20
Wen Liu, Ruochuan Cheng, Yunhai Ma, Dan Wang, Yanjun Su, Chang Diao, Jianming Zhang, Jun Qian, Jin Liu
Early preoperative diagnosis of central lymph node metastasis (CNM) is crucial to improve survival rates among patients with papillary thyroid carcinoma (PTC). Here, we analyzed clinical data from 2862 PTC patients and developed a scoring system using multivariable logistic regression and testified by the validation group. The predictive diagnostic effectiveness of the scoring system was evaluated based on consistency, discrimination ability, and accuracy. The scoring system considered seven variables: gender, age, tumor size, microcalcification, resistance index >0...
May 3, 2018: Scientific Reports
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