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https://www.readbyqxmd.com/read/29150298/spontaneous-osteoclastogenesis-hypothesis-for-gender-unrelated-osteoporosis-screening-and-diagnosis
#1
F Salamanna, R Giardino, M Fini
Women are at greater risk of developing osteoporosis (OP). However, in the past few years it has become more widely recognized that OP is a significant problem also in men although OP is frequently under-diagnosed and, consequently, under treated in men. Most guidelines, screening and fracture risk evaluation methods as well as pharmacologic agents have been developed for women and then adapted to men. Bone Mineral Density (BMD) measurement by Dual X-ray Absorptiometry (DEXA) is reported as T score and the capability of DEXA to diagnose OP and predict fracture risk is still debated...
November 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/29149593/notch2-hajdu-cheney-mutations-escape-scf-fbw7-dependent-proteolysis-to-promote-osteoporosis
#2
Hidefumi Fukushima, Kouhei Shimizu, Asami Watahiki, Seira Hoshikawa, Tomoki Kosho, Daiju Oba, Seiji Sakano, Makiko Arakaki, Aya Yamada, Katsuyuki Nagashima, Koji Okabe, Satoshi Fukumoto, Eijiro Jimi, Anna Bigas, Keiichi I Nakayama, Keiko Nakayama, Yoko Aoki, Wenyi Wei, Hiroyuki Inuzuka
Hajdu-Cheney syndrome (HCS), a rare autosomal disorder caused by heterozygous mutations in NOTCH2, is clinically characterized by acro-osteolysis, severe osteoporosis, short stature, neurological symptoms, cardiovascular defects, and polycystic kidneys. Recent studies identified that aberrant NOTCH2 signaling and consequent osteoclast hyperactivity are closely associated with the bone-related disorder pathogenesis, but the exact molecular mechanisms remain unclear. Here, we demonstrate that sustained osteoclast activity is largely due to accumulation of NOTCH2 carrying a truncated C terminus that escapes FBW7-mediated ubiquitination and degradation...
November 16, 2017: Molecular Cell
https://www.readbyqxmd.com/read/29149388/problems-of-reconstructive-cranioplasty-after-traumatic-brain-injury-in-children
#3
Paolo Frassanito, Gianpiero Tamburrini, Luca Massimi, Simone Peraio, Massimo Caldarelli, Concezio Di Rocco
Cranial repair after traumatic brain injury in children is still burdened by unsolved problems and controversial issues, mainly due to the high rate of resorption of autologous bone as well as the absence of valid alternative material to replace the autologous bone. Indeed, inert biomaterials are associated to satisfactory results in the short period but bear the continuous risk of complications related to the lack of osteointegration capacity. Biomimetic materials claiming osteoconductive properties that could balance their mechanical limits seem to allow good cranial bone reconstruction...
October 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29149352/prognostic-potential-of-markers-of-bone-turnover-in-delayed-healing-tibial-diaphyseal-fractures
#4
Malhar Kumar, Dnyaneshwar Shelke, Saumil Shah
INTRODUCTION: Clinical and radiographic examinations detect delayed or nonunion only after the event has occurred. Biochemical markers of bone turnover (BTMs) are promising laboratory tools that offer an early insight into the likelihood of delayed union. We hypothesized that BTMs display temporal variations following fractures and the behavior of BTMs differ between normal and delayed union of fractures. METHODS: This was a prospective study of patients with closed fracture of tibia treated with intramedullary, interlocking nailing...
November 17, 2017: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
https://www.readbyqxmd.com/read/29147823/primary-peri-implant-oral-intra-epithelial-neoplasia-carcinoma-in-situ-a-case-report-considering-risk-factors-for-carcinogenesis
#5
Makoto Noguchi, Hiroaki Tsuno, Risa Ishizaka, Kumiko Fujiwara, Shuichi Imaue, Kei Tomihara, Takashi Minamisaka
BACKGROUND: Major risk factors for oral squamous cell carcinoma (SCC) are tobacco smoking, a betel quid chewing habit, and heavy alcohol consumption. However, around 15% of oral SCCs cannot be explained by these risk factors. Although oral SCC associated with dental implants is quite rare, there has been a recent gradual accumulation of reports about it. Here, we report a case of primary peri-implant oral intra-epithelial neoplasia/carcinoma in situ (OIN/CIS) in a woman without the major risk factors for oral SCC...
November 16, 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/29146302/mechanisms-involved-in-bone-resorption-regulated-by-vitamin-d
#6
REVIEW
Yuko Nakamichi, Nobuyuki Udagawa, Tatsuo Suda, Naoyuki Takahashi
Active forms of vitamin D enhance osteoclastogenesis in vitro and in vivo through the vitamin D receptor (VDR) in osteoblast-lineage cells consisting of osteoblasts and osteocytes. This pro-resorptive activity was evident basically with higher concentrations of active vitamin D than those expected in physiological conditions. Nevertheless, vitamin D compounds have been used in Japan for treating osteoporosis to increase bone mineral density (BMD). Of note, the increase in BMD by long-term treatment with pharmacological (=near-physiological) doses of vitamin D compounds was caused by the suppression of bone resorption...
November 13, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29145829/effect-of-a-rare-genetic-variant-of-tm7sf4-gene-on-osteoclasts-of-patients-with-paget-s-disease-of-bone
#7
Emilie Laurier, Nathalie Amiable, Edith Gagnon, Jacques P Brown, Laëtitia Michou
BACKGROUND: Dendritic Cell-Specific Transmembrane Protein (DC-STAMP) is involved in osteoclastogenesis with a key role in mononucleated osteoclasts fusion. We reported in patients with Paget's disease of bone (PDB) a rare variant (rs62620995) in the TM7SF4 gene, encoding for DC-STAMP, which changes a highly conserved amino acid, possibly damaging according to in silico predictions. This study aimed at determining the functional effects of this variant on osteoclast phenotype in PDB. METHODS: Fifty ml of peripheral blood were collected in pagetic patients carrier of this variant (n = 4) or not (n = 4) and healthy controls (n = 4)...
November 16, 2017: BMC Medical Genetics
https://www.readbyqxmd.com/read/29145718/lipopolysaccharide-lps-induced-autophagy-is-responsible-for-enhanced-osteoclastogenesis
#8
Ok-Joo Sul, Hyun-Jung Park, Ho-Jung Son, Hye-Seon Choi
We hypothesized that inflammation affects number and activity of osteoclasts (OCs) via enhancing autophagy. Lipopolysaccharide (LPS) induced autophagy, osteoclastogenesis, and cytoplasmic reactive oxygen species (ROS) in bone marrowderived macrophages that were pre-stimulated with receptor activator of nuclear factor-κB ligand. An autophagy inhibitor, 3-methyladenine (3-MA) decreased LPS-induced OC formation and bone resorption, indicating that autophagy is responsible for increasing number and activity of OCs upon LPS stimulus...
November 16, 2017: Molecules and Cells
https://www.readbyqxmd.com/read/29145431/effects-of-periodontitis-on-the-development-of-asthma-the-role-of-photodynamic-therapy
#9
Larissa Carbonera Candeo, Nicole Cristine Rigonato-Oliveira, Aurileia Aparecida Brito, Rodrigo Labat Marcos, Cristiane Miranda França, Kristianne Porta Santos Fernandes, Raquel Agnelli Mesquita-Ferrari, Sandra Kalil Bussadori, Rodolfo Paula Vieira, Adriana Lino-Dos-Santos-Franco, Ana Paula Ligeiro-Oliveira, Anna Carolina Ratto Tempestini Horliana
To evaluate whether periodontitis modulates lung inflammation in an experimental model of asthma as well as the photodynamic therapy (PDT) is associated with a reduction of lung inflammation. Seventy-two BALB/c male mice (~2 months) were randomly divided into 8 groups (n = 9): Basal, Periodontitis (P), P+PT, P+PT+PDT, Asthma (A), A+P, A+P+PT, and A+P+PT+PDT. Periodontitis was induced by using the ligature technique and asthma was induced by ovalbumin (OVA). PT was performed with curettes and PDT with methylene blue (0...
2017: PloS One
https://www.readbyqxmd.com/read/29145011/preparation-of-morselised-bone-for-impaction-grafting-using-a-blender-method
#10
Mark Ruddy, David P FitzPatrick, Kenneth T Stanton
Impaction bone grafting is a method of restoring bone stock to patients suffering significant bone loss due to revision total hip surgery. The procedure requires morselised bone (MB) to be impacted into the site of bone loss in order to stabilise the prosthesis with the aim of the long term resorption and reintegration of the impacted bone graft. Currently, the method for producing MB requires the use of expensive surgical bone mills or manually-intensive rongeurs that can produce a limited variety of particle sizes and may have a low throughput...
November 9, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29145010/the-use-of-hardened-bone-cement-as-an-impaction-grafting-extender-for-revision-hip-arthroplasty
#11
Mark Ruddy, David P FitzPatrick, Kenneth T Stanton
Impaction bone grafting is a method of restoring bone stock to patients who have suffered significant bone loss due to revision total hip surgery. The procedure requires morsellised cancellous bone (MCB) to be impacted into the site of bone loss in order to stabilise the prosthesis with the aim of long term resorption and reintegration of the impacted bone graft. Due to financial cost and the potential to transmit disease, the use of supplementary material, known as an extender, is frequently used to increase the graft material volume...
November 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29144812/increased-bone-turnover-in-type-2-diabetes-patients-randomized-to-bariatric-surgery-vs-medical-therapy-at-5-years
#12
Megan R Crawford, Nathan Pham, Leila Khan, James F Bena, Philip R Schauer, Sangeeta R Kashyap
OBJECTIVE: The aim of our study was to determine the 5 year outcomes of bariatric surgery vs. intensive medical therapy on bone turnover in patients with type 2 diabetes (T2DM) from the STAMPEDE trial. METHODS: This is an ancillary investigation of a 5 year randomized control trial at a single tertiary care center involving 95 patients aged 48.5 ± 8 years with obesity (BMI: 36.5±3.6 kg/m(2)) and uncontrolled T2DM (HbA1C: 9.3 ±1.6%). Patients were randomized to intensive medical therapy (IMT; N=25), Roux-en-Y gastric bypass (RYGB; N=37), or sleeve gastrectomy (SG; N=33) for diabetes treatment...
November 16, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/29143546/is-the-proximal-bone-resorption-around-the-femoral-stem-after-hip-arthroplasty-really-caused-by-reduced-stress
#13
(no author information available yet)
No abstract text is available yet for this article.
November 16, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/29143140/impact-of-conventional-medical-therapy-on-bone-mineral-density-and-bone-turnover-in-adult-patients-with-x-linked-hypophosphatemia-a-6-year-prospective-cohort-study
#14
Vikram Vinod Shanbhogue, Stinus Hansen, Niklas Rye Jørgensen, Signe Sparre Beck-Nielsen
X-linked hypophosphatemia (XLH) is a rare, inheritable disorder manifesting as rickets in children and osteomalacia in adults. While conventional medical treatment with oral phosphate and alfacalcidol is recommended in childhood, it is undecided whether adults should continue therapy. The aim of this 6-year prospective study was to determine the impact of conventional medical treatment on areal bone mineral density (aBMD), bone turnover markers (BTMs) and measures of calcium homeostasis in 27 adult patients with XLH, 11 of whom received medical treatment...
November 15, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/29142870/intracorporeal-reduction-of-condylar-fracture-using-both-pedicled-condylar-and-seperated-ramal-fragments-after-vertical-ramal-osteotomy
#15
Il-Kyu Kim, Jun-Min Jang, Hyun-Young Cho, Ji-Hoon Seo, Dong-Hwan Lee
The aim of this study is to introduce a surgical technique that can maintain blood supply to prevent condylar resorption in the extracorporeal reduction of condylar fracture. Neither the medial pterygoid muscle on the ramal bone nor the lateral pterygoid muscle on the condylar fragment was detached after vertical ramal osteotomy. Thus, reduction was performed in the intracorporeal state. Therefore, blood supply was expected to be maintained to the fragments of both the condylar and ramal bones. On postoperative radiographs, the anatomical outline of the fractured condyle was well restored, and the occlusion was stable...
October 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/29142636/bone-flap-resorption-following-cranioplasty-with-autologous-bone-quantitative-measurement-of-bone-flap-resorption-and-predictive-factors
#16
Sang Pil Park, Jae Hoon Kim, Hee In Kang, Deok Ryeong Kim, Byung Gwan Moon, Joo Seung Kim
Objective: To quantitatively measure the degree of bone flap resorption (BFR) following autologous bone cranioplasty and to investigate factors associated with BFR. Methods: We retrospectively reviewed 29 patients who underwent decompressive craniectomy and subsequent autologous bone cranioplasty between April 2005 and October 2014. BFR was defined as: 1) decrement ratio ([the ratio of initial BF size/craniectomy size]-[the ratio of last BF/craniectomy size]) >0...
November 2017: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/29142173/effect-of-dibutyltin-on-placental-and-fetal-toxicity-in-rat
#17
Satoshi Furukawa, Naho Tsuji, Yoshiyuki Kobayashi, Yoshikazu Yamagishi, Seigo Hayashi, Masayoshi Abe, Yusuke Kuroda, Masayuki Kimura, Chisato Hayakawa, Akihiko Sugiyama
In order to elucidate the effect of chorioallantoic and yolk sac placenta on the embryonic/fetal toxicity in dibutyltin dichloride (DBTCl)-exposed rats, we examined the histopathological changes and the tissue distribution of dibutyltin in the placentas and embryos. DBTCl was orally administered to the groups at doses of 0 mg/kg during gestation days (GD)s 7-9 (control group) and 20 mg/kg during GDs 7-9 (GD7-9 treated group), and GDs 10-12 (GD10-12 treated group). The total fetal mortality was increased, and malformations characterized by craniofacial dysmorphism were detected in the GD7-9 treated group...
2017: Journal of Toxicological Sciences
https://www.readbyqxmd.com/read/29141864/il-1%C3%AE-induces-pathologically-activated-osteoclasts-bearing-extremely-high-levels-of-resorbing-activity-a-possible-pathological-subpopulation-of-osteoclasts-accompanied-by-suppressed-expression-of-kindlin-3-and-talin-1
#18
Takuma Shiratori, Yukari Kyumoto-Nakamura, Akiko Kukita, Norihisa Uehara, Jingqi Zhang, Kinuko Koda, Mako Kamiya, Tamer Badawy, Erika Tomoda, Xianghe Xu, Takayoshi Yamaza, Yasuteru Urano, Kiyoshi Koyano, Toshio Kukita
As osteoclasts have the central roles in normal bone remodeling, it is ideal to regulate only the osteoclasts performing pathological bone destruction without affecting normal osteoclasts. Based on a hypothesis that pathological osteoclasts form under the pathological microenvironment of the bone tissues, we here set up optimum culture conditions to examine the entity of pathologically activated osteoclasts (PAOCs). Through searching various inflammatory cytokines and their combinations, we found the highest resorbing activity of osteoclasts when osteoclasts were formed in the presence of M-CSF, receptor activator of NF-κB ligand, and IL-1β...
November 15, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29140389/influence-of-rhbmp-2-on-guided-bone-regeneration-for-placement-and-functional-loading-of-dental-implants-a-radiographic-and-histologic-study-in-dogs
#19
Heithem Ben Amara, Jung-Won Lee, Jung-Ju Kim, Yun-Mi Kang, Eun-Jung Kang, Ki-Tae Koo
PURPOSE: Evidence on the outcomes of functional loading placed in recombinant human bone morphogenetic protein 2 (rhBMP-2)/acellular collagen sponge (ACS)-induced bone is lacking. The aim of this study was to verify whether guided bone regeneration (GBR) with rhBMP-2/ACS enhances regeneration of missing bone and osseointegration of dental implants subject to functional loading. MATERIALS AND METHODS: Two bilateral standardized large saddle-type defects (≈10 × 10 × 6 mm) were surgically created in each mandible of seven beagle dogs 2 months after tooth extraction...
November 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29140387/full-mouth-rehabilitation-with-calvarium-bone-grafts-and-dental-implants-for-a-papillon-lef%C3%A3-vre-syndrome-patient-case-report
#20
Bassam M Kinaia, Kristyn Hope, Ahmed Zuhaili, Jean Francois Tulasne
Papillon-Lefèvre syndrome (PLS) is a rare autosomal recessive disorder of keratinization associated with palmoplantar keratoderma and severe periodontitis resulting in complete edentulism in late adolescence. The pathognomonic dental features of PLS are pathologic migration, hypermobility, and exfoliation of the teeth without any signs of root resorption. It has been suggested that an effective way to treat PLS patients presenting early in the disease progression is extraction of the erupted primary dentition or hopeless permanent teeth followed by antibiotic coverage with periodontal therapy for the remaining teeth...
November 2017: International Journal of Oral & Maxillofacial Implants
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