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https://www.readbyqxmd.com/read/28093793/the-sex-dependent-effects-of-letrozole-on-anxiety-in-middle-aged-rats
#1
Veronika Borbélyová, Emese Domonkos, Melinda Csongová, Mária Kačmárová, Daniela Ostatníková, Peter Celec, Július Hodosy
Aromatase catalyzes the conversion of testosterone to estradiol and is involved in physiological effects of sex hormones on brain functions. Animal experiments have shown that the aromatase inhibitor, letrozole, can induce anxiety in young ovariectomized females that are used as a model of aging. Whether or not these effects would be similar in intact middle-aged animals is unknown. The aim of our study was to analyze the effects of letrozole on anxiety in middle-aged rats of both sexes. Fifteen months old male and female rats were treated daily with either letrozole or vehicle for 2 weeks...
January 16, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28089575/association-of-uterine-fibroids-and-pregnancy-outcomes-after-ovarian-stimulation-intrauterine-insemination-for-unexplained-infertility
#2
Aaron K Styer, Susan Jin, Dan Liu, Baisong Wang, Alex J Polotsky, Mindy S Christianson, Wendy Vitek, Lawrence Engmann, Karl Hansen, Robert Wild, Richard S Legro, Christos Coutifaris, Ruben Alvero, Randal D Robinson, Peter Casson, Gregory M Christman, Alicia Christy, Michael P Diamond, Esther Eisenberg, Heping Zhang, Nanette Santoro
OBJECTIVE: To investigate the association of non-cavity-distorting uterine fibroids and pregnancy outcomes after ovarian stimulation-intrauterine insemination (OS-IUI) in couples with unexplained infertility. DESIGN: Secondary analysis from a prospective, randomized, multicenter clinical trial investigating fertility outcomes after OS-IUI. SETTING: Reproductive Medicine Network clinical sites. PATIENT(S): Nine hundred couples with unexplained infertility who participated in the Assessment of Multiple Intrauterine Gestations from Ovarian Stimulation (AMIGOS) clinical trial...
January 12, 2017: Fertility and Sterility
https://www.readbyqxmd.com/read/28076829/comparing-the-effect-of-aromatase-inhibitor-letrozole-cabergoline-dostinex-and-letrozole-alone-on-uterine-myoma-regression-a-randomized-clinical-trial
#3
M Sayyah-Melli, M Mobasseri, P M Gharabaghi, E Ouladsahebmadarek, V Rahmani
OBJECTIVE: To evaluate the effect of letrozole in combination with cabergoline and letrozole alone on regression of symptomatic uterine myomas in women of reproductive age. DESIGN: Randomized controlled clinical trial. SETTING: University hospital. PATIENTS: Ninety-one women of reproductive age were enrolled in the study and 88 women were eligible. Eight participants were excluded from the study. INTERVENTIONS: Eighty women of reproductive age with symptomatic myomas >4cm were evaluated in two groups...
December 23, 2016: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/28057567/prenatal-administration-of-letrozole-reduces-sdn-and-scn-volume-and-cell-number-independent-of-partner-preference-in-the-male-rat
#4
Sandra Olvera-Hernández, Miguel Tapia-Rodríguez, Dick F Swaab, Alonso Fernández-Guasti
During development, the exposure to testosterone, and its conversion to estradiol by an enzyme complex termed aromatase, appears to be essential in adult male rats for the expression of typical male sexual behavior and female-sex preference. Some hypothalamic areas are the supposed neural bases of sexual preference/orientation; for example, male-oriented rams have a reduced volume of the sexually dimorphic nucleus (oSDN), while in homosexual men this nucleus does not differ from that of heterosexual men. In contrast, homosexual men showed a larger number of vasopressinergic cells in the suprachiasmatic nucleus (SCN)...
January 3, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28057549/novel-amphiphilic-chitosan-nanocarriers-for-sustained-oral-delivery-of-hydrophobic-drugs
#5
Marjan Motiei, Soheila Kashanian
Chitosan (CS) has been investigated for its ability to be modified hydrophobically and self-assembled into nanocarriers. They can encapsulate drugs and protect them in a promising approach. However, loss of carrier stability against biological environments induces low bioavailability of encapsulated drugs after oral administration. The objective of this work was to develop and characterize a novel self-assembled nanocarrier using cross-linker under acidic condition to enhance oral absorption of a hydrophobic model drug such as Letrozole (LTZ)...
January 3, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28054005/data-of-aromatase-inhibitors-alone-and-in-combination-with-raloxifene-on-microarchitecture-of-lumbar-vertebrae-and-strength-test-in-femoral-diaphysis-of-vcd-treated-ovotoxic-mice
#6
Abul Kalam, Sushama Talegaonkar, Divya Vohora
Currently, the third generation aromatase inhibitors are the drugs of choice for treatment of early and advanced breast cancer in postmenopausal women. The negative impact of these drugs on bone health is the significant limiting factor during this therapy. Here we report the effect of two aromatase inhibitors viz. letrozole and exemestane alone and in combination with raloxifene on lumbar vertebrae and femoral diaphysis after one month of treatment but no discernible effects were observed on bone when tested by micro CT and strength test except in trabecular number which was reduced in lumbar vertebrae following letrozole and exemestane...
February 2017: Data in Brief
https://www.readbyqxmd.com/read/28052589/magnetic-iron-oxide-nanoparticles-grafted-n-isopropylacrylamide-chitosan-copolymer-for-the-extraction-and-determination-of-letrozole-in-human-biological-samples
#7
Mercede Khalaj Moazen, Homayon Ahmad Panahi
Magnetic iron oxide nanoparticles are used for the extraction of a drug from an aqueous solution. In the current study, the magnetic iron oxide nanoparticles were synthesized via a facile co-precipitation approach, and then modified by (3-mercaptopropyl)trimethoxysilane followed by grafting thermosensitive polymer N-isopropylacrylamide and biopolymer chitosan. Structure, morphology, size, thermal resistance, specific surface area and magnetic properties of the grafted nano-sorbent were characterized by using Fourier transform infrared spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, elemental analysis, thermogravimetric analysis, specific surface area analyzer Brunauer-Emmett-Teller and vibrating sample magnetometer techniques...
January 4, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28045625/ki67-proliferation-index-as-a-tool-for-chemotherapy-decisions-during-and-after-neoadjuvant-aromatase-inhibitor-treatment-of-breast-cancer-results-from-the-american-college-of-surgeons-oncology-group-z1031-trial-alliance
#8
Matthew J Ellis, Vera J Suman, Jeremy Hoog, Rodrigo Goncalves, Souzan Sanati, Chad J Creighton, Katherine DeSchryver, Erika Crouch, Amy Brink, Mark Watson, Jingqin Luo, Yu Tao, Michael Barnes, Mitchell Dowsett, G Thomas Budd, Eric Winer, Paula Silverman, Laura Esserman, Lisa Carey, Cynthia X Ma, Gary Unzeitig, Timothy Pluard, Pat Whitworth, Gildy Babiera, J Michael Guenther, Zoneddy Dayao, David Ota, Marilyn Leitch, John A Olson, D Craig Allred, Kelly Hunt
Purpose To determine the pathologic complete response (pCR) rate in estrogen receptor (ER) -positive primary breast cancer triaged to chemotherapy when the protein encoded by the MKI67 gene (Ki67) level was > 10% after 2 to 4 weeks of neoadjuvant aromatase inhibitor (AI) therapy. A second objective was to examine risk of relapse using the Ki67-based Preoperative Endocrine Prognostic Index (PEPI). Methods The American College of Surgeons Oncology Group (ACOSOG) Z1031A trial enrolled postmenopausal women with stage II or III ER-positive (Allred score, 6 to 8) breast cancer whose treatment was randomly assigned to neoadjuvant AI therapy with anastrozole, exemestane, or letrozole...
January 3, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28039445/aromatase-inhibitor-induced-bone-loss-increases-the-progression-of-estrogen-receptor-negative-breast-cancer-in-bone-and-exacerbates-muscle-weakness-in-vivo
#9
Laura E Wright, Ahmed A Harhash, Wende M Kozlow, David L Waning, Jenna N Regan, Yun She, Sutha K John, Sreemala Murthy, Maryla Niewolna, Andrew R Marks, Khalid S Mohammad, Theresa A Guise
Aromatase inhibitors (AIs) cause muscle weakness, bone loss, and joint pain in up to half of cancer patients. Preclinical studies have demonstrated that increased osteoclastic bone resorption can impair muscle contractility and prime the bone microenvironment to accelerate metastatic growth. We hypothesized that AI-induced bone loss could increase breast cancer progression in bone and exacerbate muscle weakness associated with bone metastases. Female athymic nude mice underwent ovariectomy (OVX) or sham surgery and were treated with vehicle or AI (letrozole; Let)...
December 25, 2016: Oncotarget
https://www.readbyqxmd.com/read/28032117/circulating-estradiol-regulates-brain-derived-estradiol-via-actions-at-gnrh-receptors-to-impact-memory-in-ovariectomized-rats
#10
Britta S Nelson, Katelyn L Black, Jill M Daniel
Systemic estradiol treatment enhances hippocampus-dependent memory in ovariectomized rats. Although these enhancements are traditionally thought to be due to circulating estradiol, recent data suggest these changes are brought on by hippocampus-derived estradiol, the synthesis of which depends on gonadotropin-releasing hormone (GnRH) activity. The goal of the current work is to test the hypothesis that peripheral estradiol affects hippocampus-dependent memory through brain-derived estradiol regulated via hippocampal GnRH receptor activity...
November 2016: ENeuro
https://www.readbyqxmd.com/read/28028261/-two-cases-of-er-positive-postmenopausal-breast-cancer-that-increased-in-size-during-neoadjuvant-hormone-therapy
#11
Takanori Jinno, Yasuhiro Kurumiya, Tae Niwa, Ei Sekoguchi, Satoshi Kobayashi, Kiyotaka Kawai, Muneyasu Kiriyama
The first patient was a 62-year-old woman who was referred to our hospital with the complaint of a left breast tumor. She was diagnosed with invasive ductal carcinoma(T1N0M0, stage I). The tumor was ER-positive, PgR-negative, and HER2- negative. She was treated with toremifene, letrozole, and anastrozole as neoadjuvant hormone therapy for 4 months, but the tumor increased in size. The clinical response was judged as progressive disease, and a left partial mastectomy and axillary lymph node dissection were performed...
December 2016: Gan to Kagaku Ryoho. Cancer & Chemotherapy
https://www.readbyqxmd.com/read/28028198/sex-dependent-regulation-of-aromatase-mediated-synaptic-plasticity-in-the-basolateral-amygdala
#12
Roland A Bender, Lepu Zhou, Ricardo Vierk, Nicola Brandt, Alexander Keller, Christine E Gee, Michael K E Schäfer, Gabriele M Rune
: The basolateral amygdala (BLA) integrates sensory input from cortical and subcortical regions, a function that requires marked synaptic plasticity. Here we provide evidence that cytochrome P450 aromatase (AROM), the enzyme converting testosterone to 17β-estradiol (E2), contributes to the regulation of this plasticity in a sex-specific manner. We show that AROM is expressed in the BLA, particularly in the basolateral nucleus (BL), in male and female rodents. Systemic administration of the AROM-inhibitor letrozole reduced spine synapse density in the BL of adult female mice, but not in the BL of male mice...
December 27, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28008779/the-effect-of-undaria-pinnatifida-fucoidan-on-the-pharmacokinetics-of-letrozole-and-tamoxifen-in-patients-with-breast-cancer
#13
Shreya Tocaciu, Lesley J Oliver, Ray M Lowenthal, Gregory M Peterson, Rahul Patel, Madhur Shastri, Georgia McGuinness, Inger Olesen, J Helen Fitton
BACKGROUND: Although the use of complementary and alternative medicines is widespread in cancer patients, clinical evidence of their benefits is sparse. Furthermore, while they are often assumed to be safe with regard to concurrent use of anticancer therapies, few studies have been carried out to investigate possible interactions. Fucoidans are a group of sulfated carbohydrates, derived from marine brown algae, which have long been used as dietary supplements due to their reported medicinal properties, including anticancer activity...
December 1, 2016: Integrative Cancer Therapies
https://www.readbyqxmd.com/read/28008376/assessment-of-bone-health-in-breast-cancer-patients-starting-adjuvant-aromatase-inhibitors-a-quality-improvement-clinical-audit
#14
Jamal Zekri, Kamel Farag
INTRODUCTION: Adjuvant Aromatase Inhibitors (AIs) predispose breast cancer patients to accelerated bone loss. Guidelines recommend initial screening and follow up of bone mineral density with dual energy X-ray absorptiometry (DEXA) scan. In this audit we assessed the rate of adherence to these guidelines and introduced awareness measures to improve it. METHODS: All post-menopausal women who started upfront adjuvant AIs (letrozole in all patients) between January 2007 and December 2013 were retrospectively identified...
November 2016: Journal of Bone Oncology
https://www.readbyqxmd.com/read/27995453/laparoscopic-glissonean-pedicle-transection-takasaki-for-negative-fluorescent-counterstaining-of-segment-6
#15
Takashi Mizuno, Rahul Sheth, Masakazu Yamamoto, Hyun Seon C Kang, Suguru Yamashita, Thomas A Aloia, Yun Shin Chun, Jeffrey E Lee, Jean-Nicolas Vauthey, C Conrad
BACKGROUND: The portal pedicles are wrapped in connective tissue known as the Walaeus sheath, which abut Laennec's capsule covering the liver parenchyma. Precise knowledge of this anatomic relationship allows for dissection of this interspace and early control of the segmental portal pedicle (Glissonean pedicle transection method [GPTM], Takasaki approach). (1,2) Subsequent systemic administration of indocyanine green (ICG) leads to negative counterstaining of the segment to be resected...
December 19, 2016: Annals of Surgical Oncology
https://www.readbyqxmd.com/read/27967255/endocrine-therapy-in-epithelial-ovarian-cancer
#16
Simon P Langdon, Charlie Gourley, Hani Gabra, Barbara Stanley
The estrogen receptor (ER) is expressed at high levels in many epithelial ovarian cancers (EOC) and represents a potential target for endocrine therapy. Both anti-estrogens and aromatase inhibitors have been evaluated in phase II clinical trials. Areas covered: We present an overview of the phase II and phase III trials of anti-estrogens (tamoxifen and fulvestrant) and aromatase inhibitors (letrozole, anastrazole and exemestane) undertaken in epithelial ovarian cancer identified through a Pubmed search. We describe predictive biomarkers that are being investigated to identify responsive cancers...
December 24, 2016: Expert Review of Anticancer Therapy
https://www.readbyqxmd.com/read/27959613/palbociclib-and-letrozole-in-advanced-breast-cancer
#17
RANDOMIZED CONTROLLED TRIAL
Richard S Finn, Miguel Martin, Hope S Rugo, Stephen Jones, Seock-Ah Im, Karen Gelmon, Nadia Harbeck, Oleg N Lipatov, Janice M Walshe, Stacy Moulder, Eric Gauthier, Dongrui R Lu, Sophia Randolph, Véronique Diéras, Dennis J Slamon
Background A phase 2 study showed that progression-free survival was longer with palbociclib plus letrozole than with letrozole alone in the initial treatment of postmenopausal women with estrogen-receptor (ER)-positive, human epidermal growth factor receptor 2 (HER2)-negative advanced breast cancer. We performed a phase 3 study that was designed to confirm and expand the efficacy and safety data for palbociclib plus letrozole for this indication. Methods In this double-blind study, we randomly assigned, in a 2:1 ratio, 666 postmenopausal women with ER-positive, HER2-negative breast cancer, who had not had prior treatment for advanced disease, to receive palbociclib plus letrozole or placebo plus letrozole...
November 17, 2016: New England Journal of Medicine
https://www.readbyqxmd.com/read/27943008/effects-of-exemestane-and-letrozole-therapy-on-plasma-concentrations-of-estrogens-in-a-randomized-trial-of-postmenopausal-women-with-breast-cancer
#18
Jason D Robarge, Zereunesay Desta, Anne T Nguyen, Lang Li, Daniel Hertz, James M Rae, Daniel F Hayes, Anna M Storniolo, Vered Stearns, David A Flockhart, Todd C Skaar, N Lynn Henry
PURPOSE: Inter-individual differences in estrogen concentrations during treatment with aromatase inhibitors (AIs) may contribute to therapeutic response and toxicity. The aim of this study was to determine plasma concentrations of estradiol (E2), estrone (E1), and estrone sulfate (E1S) in a large cohort of AI-treated breast cancer patients. METHODS: In a randomized, multicenter trial of postmenopausal women with early-stage breast cancer starting treatment with letrozole (n = 241) or exemestane (n = 228), plasma estrogen concentrations at baseline and after 3 months were quantitated using a sensitive mass spectrometry-based assay...
February 2017: Breast Cancer Research and Treatment
https://www.readbyqxmd.com/read/27932523/treatment-of-recurrent-ovarian-cysts-and-primary-infertility-by-iranian-traditional-medicine-a-case-report
#19
Mehdi Salehi, Mohammad Setayesh, Roshanak Mokaberinejad
Infertility is a medical and psychosocial problem with a high prevalence. There are different treatments for this problem in Iranian traditional medicine. A 28-year-old woman presented with the complaints of 4 emergency operations of the left ovarian cyst during 4 years and infertility. Diagnostic laparoscopy showed an ovarian cyst, adhesion, and endometriosis. Hysteroscopy was unremarkable. After 2 months of letrozole administration, the ovarian cyst ruptured again. Considering the failure of conventional treatments, Iranian traditional medicine products were administered to the patient...
December 8, 2016: Journal of Evidence-based Complementary & Alternative Medicine
https://www.readbyqxmd.com/read/27927075/soy-isoflavones-exert-beneficial-effects-on-letrozole-induced-rat-polycystic-ovary-syndrome-pcos-model-through-anti-androgenic-mechanism
#20
Ravi Kumar Rajan, Siva Selva Kumar M, Bhaskar Balaji
CONTEXT: Soy is the main source of phytoestrogens, which has long been used as traditional food. One major subtype of phytoestrogens includes isoflavones and they are scientifically validated for their beneficial actions on many hormone-dependent conditions. OBJECTIVE: The present study examines the effect of soy isoflavones on letrozole-induced polycystic ovary syndrome (PCOS) rat model. MATERIALS AND METHODS: PCOS was induced in Sprague-Dawley rats with of 1 mg/kg letrozole, p...
December 2017: Pharmaceutical Biology
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