Search results for "Osteon"

SPARC oppositely regulates inflammation and fibrosis in bleomycin-induced lung damage.

2011

Fibrosis results from inflammatory tissue damage and impaired regeneration. In the context of bleomycin-induced pulmonary fibrosis, we demonstrated that the matricellular protein termed secreted protein acidic and rich in cysteine (SPARC) distinctly regulates inflammation and collagen deposition, depending on its cellular origin. Reciprocal Sparc(-/-) and wild-type (WT) bone marrow chimeras revealed that SPARC expression in host fibroblasts is required and sufficient to induce collagen fibrosis in a proper inflammatory environment. Accordingly, Sparc(-/-) >WT chimeras showed exacerbated inflammation and fibrosis due to the inability of Sparc(-/-) macrophages to down-regulate tumor necrosis …

Effects of a low-level diode laser on oral keratinocytes, oral fibroblasts, endothelial cells and osteoblasts incubated with bisphosphonates: An

2014

Bisphosphonate-associated osteonecrosis of the jaw may have multiple causes, including altered bone remodeling, angiogenesis inhibition and impact of bisphosphonate on the soft tissues. Successful treatment is difficult. As a positive effect of low-level laser application on wound healing is well known, an in vitro study was designed to analyze the effect of low-level laser (280 mW, 670 nm) treatment on keratinocytes, fibroblasts, endothelial cells and osteoblasts treated with clodronate, ibandronate, pamidronate or zoledronate. Pure irradiation had a positive effect on cell viability, whereas bisphosphonate treatment had a negative impact. Viability was significantly increased in cells tre…

Bisphosphonate-related osteonecrosis. Application of adipose-derived stem cells in an experimental murine model

2019

Background Bisphosphonate-related osteonecrosis of the jaw is a pathological condition without effective established treatment and preventive strategies. The aim of this study was to analyse the effect of adipose-derived stem cells (ASC) in an experimental murine model of osteonecrosis. Material and Methods 38 Wistar rats were injected intraperitoneally with zoledronic acid. After treatment, upper jaw molars were extracted. The animals were randomly assigned to one of two groups. In the control group, saline solution was applied over the alveolar sockets after the tooth extractions. In the treatment group, ASCs were applied instead of saline solution. The control and treatment groups were s…

Jaw osteonecrosis management around a dental implant inserted 2 years before starting treatment with zoledronic acid

2015

Journal Article; Bisphosphonates (BP) are a type of drug known to inhibit bone resorption through complex interventions. Their primary mechanism of action is aimed at the cellular level, inhibiting osteoclast activity and so bone resorption. BPs are widely used, with many patients receiving continuous treatment for years. But it is well known that these drugs can produce osteonecrosis of the jaw (ONJ). Zoledronic acid (ZA) is an intravenous BP used in the treatment and prophylaxis of bone disease in patients with malignant tumors with bone implication. ZA is the most potent BP in clinical development. This report describes the case of a 62-year-old woman with breast cancer antecedents which…

Peri-implantitis-like medication-related osteonecrosis of the jaw: Clinical considerations and histological evaluation with confocal laser scanning m…

2021

Objective: In the recent years, an increasing number of peri-implant medication-related osteonecrosis of the jaw (PI-MRONJ) have been reported in literature, both in oncologic and osteoporotic patients. The aim of this study is to describe 19 cases of patients previously diagnosed as affected by peri-implantitis, who were treated for PI-MRONJ, with consideration on clinical and histopathological features. Materials and Methods: Patients included were affected by postmenopausal osteoporosis and were administered with different antiresorptive drugs. Due to the presence of clinical and radiological signs of peri-implantitis not healed after non-surgical periodontal treatment, they were referre…

Causal drugs and therapeutic measures for medication-associated osteonecrosis of the jaws-Data from German practice guideline.

2020

Osteonecrosi individuate mediante RM whole body in pazienti con Linfoma di Hodgkin trattati mediante BEACOPP.

2016

Scopo: Il trattamento del Linfoma di Hodgkin (LH) ha condotto al raggiungimento di elevati tassi di sopravvivenza [1]. Il protocollo ABVD (Doxorubicina, Bleomicina, Vinblastina e Dacarbazina) è stato considerato per molto tempo il regime chemioterapico standard nei pazienti con LH [2], grazie a una ben documentata efficacia e una scarsa tossicità. Molti studi hanno dimostrato la maggiore efficacia del protocollo BEACOPP (Bleomicina, Etoposide, Doxorubicina, Ciclofosfamide, Vincristina, Procarbazina, Prednisone) rispetto all'ABVD [3], al costo di una maggiore tossicità. L'osteonecrosi [ON] è una possibile complicanza della chemioterapia che può compromettere la qualità di vita del paziente, …

Proceedings of the Closed Round Table and Italian Consensus on the Medication-Related Osteonecrosis of Jaws (MRONJ) at the Symposium of Italian Socie…

2019

On 20 October 2018 a Closed Round Table brought together a wide range of stakeholders from several medical disciplines, including academic experts, dentists, oncologists, maxillo-facial surgeons, oral surgeons, radiologists, under the technical and scientific coordination of Giuseppina Campisi (for SIPMO) and Giacomo Oteri (for Italian Society of Oral Surgery- SIdCO)

SPARC is a new myeloid-derived suppressor cell marker licensing suppressive activities

2019

Myeloid-derived suppressor cells (MDSC) are well-known key negative regulators of the immune response during tumor growth, however scattered is the knowledge of their capacity to influence and adapt to the different tumor microenvironments and of the markers that identify those capacities. Here we show that the secreted protein acidic and rich in cysteine (SPARC) identifies in both human and mouse MDSC with immune suppressive capacity and pro-tumoral activities including the induction of epithelial-to-mesenchymal transition (EMT) and angiogenesis. In mice the genetic deletion of SPARC reduced MDSC immune suppression and reverted EMT. Sparc−/− MDSC were less suppressive overall and the granu…

Overexpression of apolipoprotein J in human fibroblasts protects against cytotoxicity and premature senescence induced by ethanol and tert-butylhydro…

2008

Human diploid fibroblasts (HDFs) exposed to subcytotoxic stresses under H2O2, tert-butylhydroperoxide (t-BHP), and ethanol (EtOH) undergo stress-induced premature senescence (SIPS) characterized by many biomarkers of HDFs replicative senescence. Among these biomarkers are a growth arrest, an increase in the senescence-associated β-galactosidase activity, a senescent morphology, an overexpression of p21waf-1 and the subsequent inability to phosphorylate pRb, the presence of the common 4977-bp mitochondrial deletion, and an increase in the steady-state level of several senescence-associated genes such as apolipoprotein J (apo J). Apo J has been described as a survival gene against cytotoxic s…