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https://www.readbyqxmd.com/read/29220822/fatigue-and-biological-properties-of-ti-6al-4v-eli-cellular-structures-with-variously-arranged-cubic-cells-made-by-selective-laser-melting
#1
M Dallago, V Fontanari, E Torresani, M Leoni, C Pederzolli, C Potrich, M Benedetti
Traditional implants made of bulk titanium are much stiffer than human bone and this mismatch can induce stress shielding. Although more complex to produce and with less predictable properties compared to bulk implants, implants with a highly porous structure can be produced to match the bone stiffness and at the same time favor bone ingrowth and regeneration. This paper presents the results of the mechanical and dimensional characterization of different regular cubic open-cell cellular structures produced by Selective Laser Melting (SLM) of Ti6Al4V alloy, all with the same nominal elastic modulus of 3GPa that matches that of human trabecular bone...
December 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29220303/locally-aggressive-connective-tissue-tumors
#2
Mrinal M Gounder, David M Thomas, William D Tap
In this review, we highlight the complexities of the natural history, biology, and clinical management of three intermediate connective tissue tumors: desmoid tumor (DT) or aggressive fibromatosis, tenosynovial giant cell tumor (TGCT) or diffuse-type pigmented villonodular synovitis (dtPVNS), and giant cell tumor of bone (GCTB). Intermediate histologies include tumors of both soft tissue and bone origin and are locally aggressive and rarely metastatic. Some common aspects to these tumors are that they can be locally infiltrative and/or impinge on critical organs, which leads to disfigurement, pain, loss of function and mobility, neurovascular compromise, and occasionally life-threatening consequences, such as mesenteric, bowel, ureteral, and/or bladder obstruction...
December 8, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/29220291/emerging-targeted-and-immune-based-therapies-in-sarcoma
#3
Seth M Pollack, Matthew Ingham, Matthew B Spraker, Gary K Schwartz
Soft tissue and bone sarcomas are malignancies of mesenchymal origin, and more than 50 subtypes are defined. For most sarcomas, locally advanced or unresectable disease is still treated with cytotoxic chemotherapy. Recently, our understanding of subtype-specific cancer biology has expanded, and it has revealed distinct molecular alterations responsible for tumor initiation and progression. These findings have motivated the development of targeted therapies that are being evaluated in subtype-specific or biomarker-driven clinical trials...
December 8, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/29217849/life-time-dosimetric-assessment-for-mice-and-rats-exposed-in-reverberation-chambers-of-the-2-year-ntp-cancer-bioassay-study-on-cell-phone-radiation
#4
Yijian Gong, Myles Capstick, Sven Kuehn, Perry Wilson, John Ladbury, Galen Koepke, David L McCormick, Ronald L Melnick, Niels Kuster
In this paper, we present the detailed life-time dosimetry analysis for rodents exposed in the reverberation exposure system designed for the two-year cancer bioassay study conducted by the National Toxicology Program of the National Institute of Environmental Health Sciences. The study required the well-controlled and characterized exposure of individually housed, unrestrained mice at 1900 MHz and rats at 900 MHz, frequencies chosen to give best uniformity exposure of organs and tissues. The wbSAR, the peak spatial SAR and the organ specific SAR as well as the uncertainty and variation due to the exposure environment, differences in the growth rates, and animal posture were assessed...
December 2017: IEEE Transactions on Electromagnetic Compatibility
https://www.readbyqxmd.com/read/29217733/sex-as-a-biological-variable-in-preclinical-imaging-research-initial-observations-with-18f-fluorothymidine
#5
Szeman Ruby Chan, Kelley Salem, Justin Jeffery, Ginny L Powers, Yongjun Yan, Kooresh I Shoghi, Aparna M Mahajan, Amy M Fowler
The study objective was to investigate whether sex influences 3'-deoxy-3'-[18F]fluorothymidine (18F-FLT) uptake and tissue distribution in mouse models of cancer. Methods:18F-FLT biodistribution was measured in three strains of male and female mice (129S6/SvEv, athymic nude, and BALB/c). 18F-Fluoro-2-deoxy-2-D-glucose (18F-FDG) biodistribution was performed for comparison. 18F-FLT uptake was also measured in female 129S6/SvEv mice bearing estrogen-dependent SSM3 mouse mammary tumors, male athymic nude mice bearing androgen-dependent CWR22 prostate cancer xenografts, and male and female athymic nude mice bearing estrogen-independent MDA-MB-231 human breast cancer xenografts...
December 7, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/29217467/why-should-we-measure-free-25-oh-vitamin-d
#6
REVIEW
Oleg Tsuprykov, Xin Chen, Carl-Friedrich Hocher, LianghongYin, Berthold Hocher
Vitamin D, either in its D2 or D3 form, is essential for normal human development during intrauterine life, kidney function and bone health. Vitamin D deficiency has also been linked to cancer development and some autoimmune diseases. Given this huge impact of vitamin D on human health, it is important for daily clinical practice and clinical research to have reliable tools to judge on the vitamin D status. The major circulating form of vitamin D3 is 25-hydroxyvitamin D3 (25(OH)D), although is not the most active metabolite, the concentrations of total 25-hydroxy vitamin D3 in the serum are currently routinely used in clinical practice to assess vitamin D status...
December 4, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29217273/ltbps-in-biology-and-medicine-ltbp-diseases
#7
REVIEW
Daniel B Rifkin, William J Rifkin, Lior Zilberberg
The latent transforming growth factor (TGF) β binding proteins (LTBP) are crucial mediators of TGFβ function, as they control growth factor secretion, matrix deposition, presentation and activation. Deficiencies in specific LTBP isoforms yield discrete phenotypes representing defects in bone, lung and cardiovascular development mediated by loss of TGFβ signaling. Additional phenotypes represent loss of unique TGFβ-independent features of LTBP effects on elastogenesis and microfibril assembly. Thus, the LTBPs act as sensors for the regulation of both growth factor activity and matrix function...
December 4, 2017: Matrix Biology: Journal of the International Society for Matrix Biology
https://www.readbyqxmd.com/read/29216915/rheumatoid-arthritis-bone-marrow-environment-supports-th17-response
#8
Ewa Kuca-Warnawin, Weronika Kurowska, Monika Prochorec-Sobieszek, Anna Radzikowska, Tomasz Burakowski, Urszula Skalska, Magdalena Massalska, Magdalena Plebańczyk, Barbara Małdyk-Nowakowska, Iwona Słowińska, Robert Gasik, Włodzimierz Maśliński
BACKGROUND: Rheumatoid arthritis (RA) is a systemic, autoimmune disease leading to joint destruction and ultimately disability. Bone marrow (BM) is an important compartment in RA, where pathological processes from "outside the joint" can occur. IL-17 is a cytokine that exerts proinflammatory effects and participates in the process of bone destruction. It is believed that IL-17 is involved in pathogenesis of RA. However, little is known about the biology of this cytokine in BM. In the present study we investigated Th17-related cytokines in RA BM...
December 8, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/29216013/bio-inspired-synthesis-of-a-hierarchical-self-assembled-zinc-phosphate-nanostructure-in-the-presence-of-cowpea-mosaic-virus-in-vitro-cell-cycle-proliferation-and-prospects-for-tissue-regeneration
#9
Koushi Kumar, Vasudevarao Penugurti, Gila Levi, Yitzhak Mastai, Bramanandam Manavathi, Pradip Paik
Self-assembly is an important auto-organization process used in designing structural biomaterials which have the potential capability to heal tissues after traumatic injury. Although various materials having the ability to heal after injury are available, there is still a substantial need to develop new improved materials. To address this issue, we have developed hierarchical three-dimensional (3D) self-assembled zinc phosphate (Zn3(PO4)2) in the presence of cowpea mosaic virus (CPMV). Zn3(PO4)2 nanoparticles are self-assembled into nanosheets with a high degree of isotropy and then self-organized into a 3D structure that can enhance surface interactions with biological entities...
December 7, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/29215316/endothelial-progenitor-cells-for-cellular-angiogenesis-and-repair-lessons-learned-from-experimental-animal-models
#10
Khawaja Husnain Haider, Salim Aziz, Mateq Ali Al-Reshidi
Stem/progenitor cell-based therapy has been extensively studied for angiomyogenic repair of the ischemic heart by regeneration of the damaged myocytes and neovascularization of the ischemic tissue through biological bypassing. Given their inherent ability to assume functionally competent endothelial phenotype and release of broad array of proangiogenic cytokines, endothelial progenitor cells (EPCs)-based therapy is deemed as most appropriate for vaculogenesis in the ischemic heart. Emulating the natural repair process that encompasses mobilization and homing-in of the bone marrow and peripheral blood EPCs, their reparability has been extensively studied in the animal models of myocardial ischemia with encouraging results...
December 7, 2017: Regenerative Medicine
https://www.readbyqxmd.com/read/29215205/bioinspired-flexible-and-tough-layered-peptide-crystals
#11
Lihi Adler-Abramovich, Zohar A Arnon, XiaoMeng Sui, Ido Azuri, Hadar Cohen, Oded Hod, Leeor Kronik, Linda J W Shimon, H Daniel Wagner, Ehud Gazit
One major challenge of functional material fabrication is combining flexibility, strength, and toughness. In several biological and artificial systems, these desired mechanical properties are achieved by hierarchical architectures and various forms of anisotropy, as found in bones and nacre. Here, it is reported that crystals of N-capped diphenylalanine, one of the most studied self-assembling systems in nanotechnology, exhibit well-ordered packing and diffraction of sub-Å resolution, yet display an exceptionally flexible nature...
December 7, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29214990/rna-sequencing-reveals-a-transcriptomic-portrait-of-human-mesenchymal-stem-cells-from-bone-marrow-adipose-tissue-and-palatine-tonsils
#12
Kyung-Ah Cho, Minhwa Park, Yu-Hee Kim, So-Youn Woo, Kyung-Ha Ryu
Human mesenchymal stem cells (MSCs) are adult multipotent cells that have plasticity and inhabit the stroma of diverse tissues. The potential utility of MSCs has been heavily investigated in the fields of regenerative medicine and cell therapy. However, MSCs represent diverse populations that may depend on the tissue of origin. Thus, the ability to identify specific MSC populations has remained difficult. Using RNA sequencing, we analyzed the whole transcriptomes of bone marrow-derived MSCs (BMs), adipose tissue-derived MSCs (AMs), and tonsil-derived MSCs (TMs)...
December 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29213288/microrna-214-suppresses-osteogenic-differentiation-of-human-periodontal-ligament-stem-cells-by-targeting-atf4
#13
Siqi Yao, Wei Zhao, Qianmin Ou, Lanchen Liang, Xuefeng Lin, Yan Wang
Periodontitis is the main cause of adult tooth loss. Stem cell-based tissue engineering has become a promising therapy for periodontitis treatment. To date, human periodontal ligament stem cells (hPDLSCs) have been shown to be a favorable source for tissue engineering, but modulatory mechanisms of hPDLSCs remain unclear. Approximately 60% of mammalian genes are the targets of over 2000 miRNAs in multiple human cell types, and miRNAs are able to influence various biological processes in the human body, including bone formation...
2017: Stem Cells International
https://www.readbyqxmd.com/read/29212682/stable-migration-of-peri-apatite-coated-uncemented-tibial-components-in-a-multicentre-study
#14
M J Dunbar, E K Laende, D Collopy, C G Richardson
AIMS: Hydroxyapatite coatings for uncemented fixation in total knee arthroplasty can theoretically provide a long-lasting biological interface with the host bone. The objective of this study was to test this hypothesis with propriety hydroxyapatite, peri-apatite, coated tibial components using component migration measured with radiostereometric analysis over two years as an indicator of long-term fixation. PATIENTS AND METHODS: A total of 29 patients at two centres received uncemented PA-coated tibial components and were followed for two years with radiostereometric analysis exams to quantify the migration of the component...
December 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/29211291/topical-application-of-bfgf-on-acid-conditioned-and-non-conditioned-dentin-effect-on-cell-proliferation-and-gene-expression-in-cells-relevant-for-periodontal-regeneration
#15
Fernanda Regina Godoy Rocha, João Antônio Chaves de Souza, Morgana Rodrigues Guimarães-Stabili, José Eduardo Cezar Sampaio, Carlos Rossa
MATERIAL AND METHODS: Periodontal regeneration is still a challenge in terms of predictability and magnitude of effect. In this study we assess the biological effects of combining chemical root conditioning and biological mediators on three relevant cell types for periodontal regeneration. Bovine dentin slices were conditioned with 25% citric acid followed by topical application of basic fibroblast growth factor (bFGF, 10 and 50 ng). We used ELISA to assess the dynamics of bFGF release from the dentin surface and RT-qPCR to study the expression of Runx2, Col1a1, Bglap and fibronectin by periodontal ligament (PDL) fibroblasts, cementoblasts and bone marrow stromal cells (BMSC) grown onto these dentin slices...
November 2017: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29211290/physical-properties-and-biological-effects-of-mineral-trioxide-aggregate-mixed-with-methylcellulose-and-calcium-chloride
#16
Bin-Na Lee, Soo-Ji Chun, Hoon-Sang Chang, Yun-Chan Hwang, In-Nam Hwang, Won-Mann Oh
OBJECTIVES: Methylcellulose (MC) is a chemical compound derived from cellulose. MTA mixed with MC reduces setting time and increases plasticity. This study assessed the influence of MC as an anti-washout ingredient and CaCl2 as a setting time accelerator on the physical and biological properties of MTA. MATERIAL AND METHODS: Test materials were divided into 3 groups; Group 1(control): distilled water; Group 2: 1% MC/CaCl2; Group 3: 2% MC/CaCl2. Compressive strength, pH, flowability and cell viability were tested...
November 2017: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29211118/venous-blood-derivatives-as-fbs-substitutes-for-mesenchymal-stem-cells-a-systematic-scoping-review
#17
Luiz A Chisini, Marcus C M Conde, Guillermo Grazioli, Alissa S San Martin, Rodrigo Varella de Carvalho, Jacques E Nör, Flávio F Demarco
Although the biological properties of mesenchymal stem cells (MSC) are well-characterized in vitro, MSC clinical application is still far away to be achieved, mainly due to the need of xenogeneic substances for cell expansion, such as fetal bovine serum (FBS). FBS presents risks regarding pathogens transmissions and internalization of animal's proteins, which can unleash antigenic responses in patients after MSC implantation. A wide range of venous blood derivatives (VBD) has been reported as FBS substitutes showing promising results...
November 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29210174/autophagy-controls-mesenchymal-stem-cell-properties-and-senescence-during-bone-aging
#18
Yang Ma, Meng Qi, Ying An, Liqiang Zhang, Rui Yang, Daniel H Doro, Wenjia Liu, Yan Jin
Bone marrow-derived mesenchymal stem cells (BMMSCs) exhibit degenerative changes, including imbalanced differentiation and reduced proliferation during aging, that contribute to age-related bone loss. We demonstrate here that autophagy is significantly reduced in aged BMMSCs compared with young BMMSCs. The autophagy inhibitor 3-methyladenine (3-MA) could turn young BMMSCs into a relatively aged state by reducing their osteogenic differentiation and proliferation capacity and enhancing their adipogenic differentiation capacity...
December 6, 2017: Aging Cell
https://www.readbyqxmd.com/read/29210060/genome-wide-association-study-identifies-the-gldc-il33-locus-associated-with-survival-of-osteosarcoma-patients
#19
Roelof Koster, Orestis A Panagiotou, William A Wheeler, Eric Karlins, Julie M Gastier-Foster, Silvia Regina Caminada de Toledo, Antonio S Petrilli, Adrienne M Flanagan, Roberto Tirabosco, Irene L Andrulis, Jay S Wunder, Nalan Gokgoz, Ana Patiño-Garcia, Fernando Lecanda, Massimo Serra, Claudia Hattinger, Piero Picci, Katia Scotlandi, David M Thomas, Mandy L Ballinger, Richard Gorlick, Donald A Barkauskas, Logan G Spector, Margaret Tucker, D Hicks Belynda, Meredith Yeager, Robert N Hoover, Sholom Wacholder, Stephen J Chanock, Sharon A Savage, Lisa Mirabello
Survival rates for osteosarcoma, the most common primary bone cancer, have changed little over the past three decades and are particularly low for patients with metastatic disease. We conducted a multi-institutional genome-wide association study (GWAS) to identify germline genetic variants associated with overall survival in 632 patients with osteosarcoma including 523 patients of European ancestry and 109 from Brazil. We conducted a time-to-event analysis and estimated hazard ratios (HR) and 95% confidence intervals (CI) using Cox proportional hazards models, with and without adjustment for metastatic disease...
December 6, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/29208364/dopamine-promotes-cellular-iron-accumulation-and-oxidative-stress-responses-in-macrophages
#20
Stefanie Dichtl, David Haschka, Manfred Nairz, Markus Seifert, Chiara Volani, Oliver Lutz, Günter Weiss
Iron is essential for many biological functions including neurotransmitter synthesis, where the metal is a co-factor of tyrosine hydroxylase, which converts tyrosine to dopamine and further to norepinephrine. As the shared chemical structure, called catechol, may potentially bind iron we questioned whether tyrosine derived hormones would impact on cellular iron homeostasis in macrophages, which are central for the maintenance of body iron homeostasis. Using murine bone marrow-derived macrophages (BMDMs), we investigated the effect of catecholamines and found that only dopamine but neither tyrosine, nor norepinephrine, affected cellular iron homeostasis...
December 2, 2017: Biochemical Pharmacology
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