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https://www.readbyqxmd.com/read/27915435/bone-remodeling-and-regulating-biomarkers-in-women-at-the-time-of-breast-cancer-diagnosis
#1
Song Yao, Yali Zhang, Li Tang, Janise M Roh, Cecile A Laurent, Chi-Chen Hong, Theresa Hahn, Joan C Lo, Christine B Ambrosone, Lawrence H Kushi, Marilyn L Kwan
PURPOSE: The majority of breast cancer patients receive endocrine therapy, including aromatase inhibitors known to cause increased bone resorption. Bone-related biomarkers at the time of breast cancer diagnosis may predict future risk of osteoporosis and fracture after endocrine therapy. METHODS: In a large population of 2,401 female breast cancer patients who later underwent endocrine therapy, we measured two bone remodeling biomarkers, TRAP5b and BAP, and two bone regulating biomarkers, RANKL and OPG, in serum samples collected at the time of breast cancer diagnosis...
December 3, 2016: Breast Cancer Research and Treatment
https://www.readbyqxmd.com/read/27908909/dtb-select-12-december-2016
#2
(no author information available yet)
Azithromycin of no benefit for asthma attacks ● Risk of heart failure with NSAIDs ● Bisphosphonates and steroid-induced osteoporosis ● Triple therapy for moderate-to-severe COPD: marginal benefits ● Much data on adverse events remains unpublished ● Rising placebo response rates in antidepressant trials a 'myth' ● Prenatal fetal RhD testing recommended.
December 1, 2016: Drug and Therapeutics Bulletin
https://www.readbyqxmd.com/read/27905067/mathematical-model-of-bone-remodeling-captures-the-antiresorptive-and-anabolic-actions-of-various-therapies
#3
David S Ross, Khamir Mehta, Antonio Cabal
A better understanding of the molecular pathways regulating the bone remodeling process should help in the development of new antiresorptive regulators and anabolic regulators, that is, regulators of bone resorption and of bone formation. Understanding the mechanisms by which parathyroid hormone (PTH) influences bone formation and how it switches from anabolic to catabolic action is important for treating osteoporosis (Poole and Reeve in Curr Opin Pharmacol 5:612-617, 2005). In this paper we describe a mathematical model of bone remodeling that incorporates, extends, and integrates several models of particular aspects of this biochemical system (Cabal et al...
November 30, 2016: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/27904727/influence-of-early-bisphosphonate-administration-for-fracture-healing-in-patients-with-osteoporotic-proximal-humerus-fractures
#4
Joong-Bae Seo, Jae-Sung Yoo, Jee-Won Ryu, Kun-Woong Yu
BACKGROUND: Bisphosphonates are generally known to adversely affect fracture healing because they inhibit osteoclastic bone resorption. However, some authors argue that bisphosphonates have no adverse effect on the restoration of the mechanical integrity of long bones after fractures. It is unclear whether bisphosphonates can be initiated safely in patients with acute proximal humerus fractures. The aim of this study was to determine whether the early use of a bisphosphonate affects healing and outcomes of osteoporotic proximal humerus fractures treated with a locking compression plate...
December 2016: Clinics in Orthopedic Surgery
https://www.readbyqxmd.com/read/27904108/denosumab-is-effective-for-controlling-serum-calcium-levels-in-patients-with-humoral-hypercalcemia-of-malignancy-syndrome-a-case-report-on-parathyroid-hormone-related-protein-producing-cholangiocarcinoma
#5
Norihiro Ashihara, Koji Nakajima, Yoshiyuki Nakamura, Mutsuhiro Kobayashi, Kumiko Shirahata, Chika Maeda, Takeshi Uehara, Daisuke Gomi, Nobuo Ito
Hypercalcemia resulting in the elevation of serum parathyroid hormone-related protein (PTHrP) and suppression of serum PTH was observed in a patient with advanced cholangiocarcinoma (CCC) and multiple lymph node metastases. We confirmed humoral hypercalcemia of malignancy based on PTHrP-producing CCC. Chemotherapy with gemcitabine and cisplatin could not control the patient's serum PTHrP levels and the patient was affected with bisphosphonate-refractory hypercalcemia. We administered a single dose of denosumab, an anti-receptor activator of nuclear factor-kappaB ligand monoclonal antibody, and the patient's serum calcium levels remained close to the normal range for approximately 3 weeks without additional treatment...
2016: Internal Medicine
https://www.readbyqxmd.com/read/27901204/response-of-a-co-culture-model-of-epithelial-cells-and-gingival-fibroblasts-to-zoledronic-acid
#6
Fernanda Gonçalves Basso, Diana Gabriela Soares, Taisa Nogueira Pansani, Ana Paula Silveira Turrioni, Débora Lopes Scheffel, Josimeri Hebling, Carlos Alberto de Souza Costa
Osteonecrosis of the jaw is an adverse effect of bisphosphonates. While the etiopathogenesis of this condition has been investigated, the interactions and effects of bisphosphonates on oral mucosa cells remain unclear. It is hypothesized that cell culture models, such as co-culture or three-dimensional cell culture models, can provide valuable insight. Therefore, the aim of this study was to evaluate the effects of zoledronic acid (ZA) on epithelial cells and gingival fibroblasts in a co-culture model. Briefly, epithelial cells were seeded on transwell inserts and gingival fibroblasts were seeded in the lower well of 24-well plates...
November 28, 2016: Brazilian Oral Research
https://www.readbyqxmd.com/read/27900455/bilateral-atypical-femur-fractures-without-bisphosphonate-exposure
#7
Lauren K Szolomayer, Izuchukwu K Ibe, Dieter M Lindskog
Atypical femur fractures have common radiographic features that set them apart from more typical higher-energy subtrochanteric femur fractures. They are noncomminuted, transverse fractures with medial spiking of the femoral cortex and increased lateral cortical thickness. These fractures have been associated in the literature with the use of bisphosphonate medications. This case describes bilateral atypical femur fractures in a patient with a medical history devoid of bisphosphonate use. We present his history, co-morbidities, and subsequent treatment...
November 30, 2016: Skeletal Radiology
https://www.readbyqxmd.com/read/27895021/1-in-vitro-and-in-vivo-activity-of-sulfur-containing-linear-bisphosphonates-against-apicomplexan-parasites
#8
Sergio H Szajnman, Tamila Galaka, Zhu-Hong Li, Catherine Li, Nathan M Howell, María N Chao, Boris Striepen, Vasant Muralidharan, Silvia N J Moreno, Juan B Rodriguez
We tested a series of sulfur-containing linear bisphosphonates against Toxoplasma gondii, the etiologic agent of toxoplasmosis. The most potent compound ( 22: , 1-[(n-decylsulfonyl)ethyl]-1,1-biphosphonic acid) is a sulfone-containing compound, which had an EC50 of 0.11 ± 0.02 μM against intracellular tachyzoites. The compound showed low toxicity when tested in tissue culture with a selectivity index of >2,000. 22: also showed high activity in vivo in a toxoplasmosis mouse model. The compound inhibited the Toxoplasma farnesyl diphosphate synthase (TgFPPS) but the concentration needed to inhibit 50% of the enzymatic activity (IC50) was higher than the concentration that inhibited 50% of growth...
November 28, 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27889760/pamidronate-attenuates-oxidative-stress-and-energetic-metabolism-changes-but-worsens-functional-outcomes-in-acute-doxorubicin-induced-cardiotoxicity-in-rats
#9
Paula Bernardo de Carvalho, Andréa de Freitas Gonçalves, Patrícia Helena Correa Alegre, Paula Schmidt Azevedo, Meliza Goi Roscani, Carolina Marabesi Bergamasco, Pamela N Modesto, Ana Angélica Fernandes, Marcos Ferreira Minicucci, Sergio Alberto Rupp Paiva, Leonardo Antonio, Mamede Zornoff, Bertha Furlan Polegato
BACKGROUND: Cardiotoxicity is the major side effect of doxorubicin. As mechanisms that are involved in cardiotoxicity are ambiguous, new methods for attenuating cardiotoxicity are needed. Recent studies have shown that bisphosphonates can decrease oxidative stress. Therefore, the objective of this study was to evaluate the effect of pamidronate on preventing acute doxorubicin-induced cardiotoxicity. METHODS: Sixty-four male Wistar rats were allocated into four groups: the control group (C), the pamidronate group (P), the doxorubicin group (D) and the doxorubicin/pamidronate group (DP)...
November 25, 2016: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/27889558/the-periosteal-microcirculation-in-health-and-disease-an-update-on-clinical-significance
#10
REVIEW
Andrea Szabó, Ágnes Janovszky, Levente Pócs, Mihály Boros
Apart from its nutritive functions, the periosteum critically affects bone regeneration via its stem/osteoprogenitor cell content. Normal healing after bone fractures, trauma-orthopedic interventions and invasive dental procedures is critically linked to the reestablishment of the periosteal microcirculation, but the reconstruction, replacement or repair of lost tissues may also be performed with autologous periosteum. Besides the initiation of cell differentiation during bone repair and remodeling processes, the periosteum together with the endosteum plays significant roles in the pathogenesis of both hormone-related and trauma-induced osteoporotic alterations in the bone metabolism...
November 23, 2016: Microvascular Research
https://www.readbyqxmd.com/read/27889053/osteoporosis-in-postmenopausal-women-living-with-hiv
#11
REVIEW
Fionnuala Finnerty, Karen Walker-Bone, Shema Tariq
The widespread availability of effective antiretroviral therapy (ART) has transformed HIV from a life-limiting condition to one with near-normal life expectancy. HIV is associated with an increased risk of osteopenia and osteoporosis, with people living with HIV (PLHIV) potentially experiencing these conditions at a younger age than their HIV-negative counterparts. The mechanisms driving bone disease in HIV are complex and include: an increased prevalence of traditional risk factors; other comorbid conditions; and HIV-associated factors such as viral effects, systemic inflammation, and ART-related factors...
January 2017: Maturitas
https://www.readbyqxmd.com/read/27888633/toll-like-receptor-9-expression-is-associated-with-breast-cancer-sensitivity-to-the-growth-inhibitory-effects-of-bisphosphonates-in-vitro-and-in-vivo
#12
Jouko Sandholm, Jaakko Lehtimäki, Tamiko Ishizu, Sadanandan E Velu, Jeremy Clark, Pirkko Härkönen, Arja Jukkola-Vuorinen, Aleksi Schrey, Kevin W Harris, Johanna M Tuomela, Katri S Selander
Bisphosphonates are standard treatments for bone metastases. When given in the adjuvant setting, they reduce breast cancer mortality and recurrence in bone but only among post-menopausal patients. Optimal drug use would require biomarker-based patient selection. Such biomarkers are not yet in clinical use. Based on the similarities in inflammatory responses to bisphosphonates and Toll-like receptor (TLR) agonists, we hypothesized that TLR9 expression may affect bisphosphonate responses in cells. We compared bisphosphonate effects in breast cancer cell lines with low or high TLR9 expression...
November 24, 2016: Oncotarget
https://www.readbyqxmd.com/read/27887569/immune-modulation-of-cd4-cd25-regulatory-t-cells-by-zoledronic-acid
#13
Hsien Liu, Shih-Han Wang, Shin-Cheh Chen, Ching-Ying Chen, Jo-Lin Lo, Tsun-Mei Lin
BACKGROUND: CD4(+)CD25(+) regulatory T (Treg) cells suppress tumor immunity by inhibiting immune cells. Manipulation of Treg cells represents a new strategy for cancer treatment. Zoledronic acid (ZA), a nitrogen-containing bisphosphonate, inhibits the expression of receptor activator of nuclear factor kappa-B ligand (RANKL) on osteoblasts to inhibit osteoclastogenesis. In a mouse model of bisphosphonate-related osteonecrosis of the jaw, administration of ZA suppressed Treg-cell activity and activated inflammatory Th17 cells...
November 25, 2016: BMC Immunology
https://www.readbyqxmd.com/read/27886696/a-review-of-osteoporosis-in-the-older-adult
#14
REVIEW
Paloma Alejandro, Florina Constantinescu
Osteoporosis in the elderly population is common. It results in more than 1.5 million fractures per year in the United States. The goal of managing osteoporosis is to prevent fractures. In men, osteoporosis is underrecognized and undertreated. More men than women die every year as a consequence of hip fractures. A review of diagnosis and treatment of osteoporosis is described in this article. Bisphosphonates are the first-line treatment for men and women. In the past several years, advances in bone biology have resulted in major therapeutic advances...
February 2017: Clinics in Geriatric Medicine
https://www.readbyqxmd.com/read/27886451/activity-of-fluorine-containing-analogues-of-wc-9-and-structurally-related-analogues-against-two-intracellular-parasites-trypanosoma-cruzi-and-toxoplasma-gondii
#15
María N Chao, Catherine Li, Melissa Storey, Bruno N Falcone, Sergio H Szajnman, Sergio M Bonesi, Roberto Docampo, Silvia N J Moreno, Juan B Rodriguez
Two obligate intracellular parasites, Trypanosoma cruzi, the agent of Chagas disease, and Toxoplasma gondii, an agent of toxoplasmosis, upregulate the mevalonate pathway of their host cells upon infection, which suggests that this host pathway could be a potential drug target. In this work, a number of compounds structurally related to WC-9 (4-phenoxyphenoxyethyl thiocyanate), a known squalene synthase inhibitor, were designed, synthesized, and evaluated for their effect on T. cruzi and T. gondii growth in tissue culture cells...
November 25, 2016: ChemMedChem
https://www.readbyqxmd.com/read/27885183/-osteoporosis-and-mechano-biosciences
#16
Toshio Matsumoto
Mechanical unloading due to long-term bedrest or microgravity during spaceflight causes a devastating influence on bone. Although bisphosphonates can prevent bone loss and hypercalciuria by mechanical unloading for up to 6 months, the influence of unloading for longer period of time is unknown. This is because mechanical loading is one of the most important stimuli for bone formation. Mechanical stress activates several intracellular signaling pathways. Among them, activation of stress-activated cation channel by fluid shear stress stimulates ERK-CREB signaling to enhance the expression of fos family transcription factors, which stimulates IL-11 expression in osteoblastic cells...
2016: Clinical Calcium
https://www.readbyqxmd.com/read/27878279/zoledronic-acid-overcomes-adriamycin-resistance-in-acute-myeloid-leukemia-cells-by-promoting-apoptosis
#17
Rui-Fang Fan, Yu-Xin Chen, Zhi-Gang Fang, Xiao-Yan Guo, Ying Lu, Ling-Ling Liu, Yi-Chuan Xu, Xiang-Fu Liu, Dong-Jun Lin
Zoledronic acid (ZOL), a nitrogen‑containing bisphosphonate, is widely used in metastatic bone disease. Previous studies indicate that ZOL has marked anti‑leukemia activity, however, the underlying mechanism of action remains to be elucidated. The present study aimed to explore the mechanism of the anti‑leukemia effect of ZOL in leukemia cells. It was observed that ZOL inhibited the proliferation of HL‑60 and adriamycin‑resistant HL‑60 (HL‑60/A) cells using a WST‑8 assay. An Annexin V‑propidium iodide indicated that ZOL induced apoptosis of the two cell types in a dose‑ and time‑dependent manner...
November 21, 2016: Molecular Medicine Reports
https://www.readbyqxmd.com/read/27877227/incidence-and-predictors-of-bone-metastases-bm-and-skeletal-related-events-sres-in-small-cell-lung-cancer-sclc-a-swiss-patient-cohort
#18
Katrin Conen, Raphael Hagmann, Viviane Hess, Alfred Zippelius, Sacha I Rothschild
Objectives: Bone metastases (BM) and skeletal-related events (SREs) are frequent complications in patients with lung cancer. Whereas in non-small-cell lung cancer (NSCLC) incidence, prognostic impact, and risk factors are well established, there is only little knowledge in patients with small cell lung cancer (SCLC). We retrospectively evaluated the incidence of BM, SRE and their treatment in a SCLC patient cohort treated at our hospital. We further assessed the role of Lactate Dehydrogenase (LDH), a possible predictor of BM development in SCLC patients...
2016: Journal of Cancer
https://www.readbyqxmd.com/read/27876532/efficacy-of-the-c-terminal-telopeptide-test-in-predicting-the-development-of-bisphosphonate-related-osteonecrosis-of-the-jaw-a-systematic-review
#19
REVIEW
K J Dal Prá, C A A Lemos, R Okamoto, A M P Soubhia, E P Pellizzer
This systematic review evaluated the efficacy of the morning fasting serum C-terminal telopeptide (CTX) test in predicting the development of bisphosphonate-related osteonecrosis of the jaw (BRONJ). A comprehensive search of studies published up to March 2016, and listed in the PubMed/MEDLINE, Web of Science, and Cochrane Library databases, was performed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. This review has been registered in the PROSPERO international prospective register of systematic reviews (CRD42016036717)...
November 19, 2016: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/27876314/risk-of-jaw-osteonecrosis-after-intravenous-bisphosphonates-in-cancer-patients-and-patients-without-cancer
#20
James S Goodwin, Jie Zhou, Yong-Fang Kuo, Jacques Baillargeon
OBJECTIVE: To compare the risk of jaw osteonecrosis after intravenous (IV) bisphosphonate administered to patients with cancer vs patients without cancer. PATIENTS AND METHODS: We conducted a retrospective cohort study of a 5% national sample of Medicare patients administered IV bisphosphonate from January 1, 2008, through December 31, 2013, for cancer vs noncancer indications. Probable jaw osteonecrosis was estimated with an algorithm including diagnoses, surgical procedures, and imaging studies...
November 19, 2016: Mayo Clinic Proceedings
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