Coronary Artery Disease ; Humans ; Osteoprotegerin

OBJECTIVEIn oder to treat periodontitis by using tissue engineering and gene engineering technology, the article established an transient expression system of bone marrow stromal cells (BMSC) modified by osteoprotegerin (OPG) gene and detected its expression using eukaryotic secreted expression pSecTag2/B-OPG plasmid.

METHODSBy solation and culture of BMSC in vitro, the identified recombined plasmid was transiently transfected into BMSC by Lipofectamine 2000 and OPG expression in BMSC was determined by RT-PCR and Western blot in 6 weeks.

RESULTSThe fragments of the recombinant plasmid digested with Hind III, EcoR I and BamH I and examined by 10 g/L agarose electrophoresis, were consistent with predicted size. The sequence of OPG was identical to the sequence provided by GeneBank [gi:33878056]. OPG transcribing in BMSC was confirmed by RT-PCR and OPG sustainable expressing in BMSC was detected by Western blot in 39 days.

CONCLUSIONThe transiently expression system of BMSC modified by OPG gene was successfully established.

OBJECTIVETo explore certain principle of how osteoprotegerin (OPG) and osteoprotegerin ligand (OPGL) take part in the periodontal tissues remodeling under the combined influence of inflammation and orthodontic force.

METHODSThe positive signals of OPG and OPGL mRNA were measured with in situ hybridzation after orthodontic tooth movement in the experimental periodontitis groups and control ones.

RESULTSThe OPG and OPGL mRNA expression intensity in the experimental group showed difference from control. All their optical density index reached a peak in day 2, respectively.

CONCLUSIONOPG and OPGL play important roles in the periodontal reconstruction induced by inflammation irritation and orthodontic force, and complex interaction could exist between the two factors.

The purpose of this study was to evaluate the correlation between nicotine and the activity of bone forming cell. MG63 osteoblast-like cells were used for this study. Several factors were examined including the proliferation of cell, alkaline phosphatase activity, the formation of osteocalcin and osteoprotegerin, and the synthesis of its mRNA. MG63 osteoblast-like cells were incubated for 1, 2, 3 and 6 days with nicotine added to the culture medium in 1.0 micrometer, 1.0 mM, 2.5 mM, 5.0 mM, 7.5 mM, and 10.0 mM concentrations. The proliferation of MG63 osteoblast-like cells was temporarily activated at the low nicotine concentrations. At high concentrations (>5.0 mM), however, it was suppressed. Alkaline phosphatase activity was suppressed in a dose-dependent manner as the concentration of nicotine increased. Osteocalcin decreased in a dose-dependent manner at high nicotine concentrations of more than 7.5 mM and the same result was show when the osteoblasts were treated with low concentrations for longer than 3 days. There was a difference in the influence of nicotine on the synthesis of osteocalcin mRNA and formation of osteocalcin itself at 1 and 3 days. Generally, osteoprotegrin notably declined in all experimental groups. However, the level of its mRNA inc-reased at high nicotine concentrations of more than 7.5 mM after 3 days and more than 5.0 mM after 6 days.
Alkaline Phosphatase ; Nicotine* ; Osteoblasts ; Osteocalcin* ; Osteoprotegerin* ; RNA, Messenger*

INTRODUCTION: Diabetes mellitus, as a major health problem for the elderly has been shown to alter the properties of the bone and impair bone healing around a titanium implant in both humans and animals. The aim of this study was to examine the effect of adipose-derived stem cells on the healing process around a titanium implant in streptozotocin-induced diabetic rats. MATERIALS AND METHODS: Thirteen rats were divided into two groups: adipose-derived stem cells injected group and a control group. A titanium screw implant (diameter: 2.0 mm, length: 3.5 mm) was placed into both tibia of 13 rats: 13 right tibia as the control group and 13 left tibia as the experimental group. The rats were sacrificed at different intervals (1, 2, and 4 weeks) after implantation for histopathology observations and immunohistochemistric analysis. RESULTS: The histopathological findings revealed earlier new formed bone in the experimental group than the control group. In particular, at 1 week after implantation, the experimental group showed more newly formed bone and collagen around the implant than the control group. In immunohistochemistric analysis, osteoprotegerin (OPG) expression in the experimental group increased early compared to that of the control group until 2 weeks after implantation. However, after 2 weeks, OPG expression in the experimental group was similar to OPG expression in the control group. The receptor activator of nuclear factor kappaB ligand (RANKL) expression in the experimental group increased early compared to that of the control group, and then decreased at 2 weeks. After 2 weeks, the level of RANKL expression was similar in both groups. CONCLUSION: These results suggest that adipose-derived stem cells in implantation can promote bone healing around titanium, particularly in diabetes mellitus induced animals.
Aged ; Animals ; Collagen ; Dental Implants ; Diabetes Mellitus ; Humans ; Osteoprotegerin ; RANK Ligand ; Rats ; Stem Cells ; Tibia ; Titanium

As the periodontal ligament cells show similar phenotype with osteoblasts, periodontal ligament cells are thought to play an important role in alveolar bone remodeling. According to recent studies, receptor activation of nuclear factor kappaB ligand (RANKL) and osteoprotegerin (OPG) are expressed in periodontal ligament cells during tooth movement. Also periodontal ligament cells is known to play an important role in the progression of periodontal disease. This study was designed how the expression of RANKL and OPG in periodontal ligament cells was regulated by IL-1betain the concentration of 0.01~10 ng/ml. The results are as follows; 1. Periodontal ligament cells which stimulated by IL-1beta increased soluble RANKL synthesis by dose-dependent pattern in the concentration of 0.01~10 ng/ml. 2. IL-1betainduced mRANKL expression in dose-dependent manner in the concentration of 0.01~5 ng/ml. 3. mOPG expression was not to be influenced by IL-1beta. These results suggested that rat periodontal ligament cells could regulate osteoclastogenesis by stimulation of production of RANKL.
Animals ; Bone Remodeling ; Osteoblasts ; Osteoprotegerin ; Periodontal Diseases ; Periodontal Ligament ; Phenotype ; Rats* ; Tooth Movement

No abstract available.
Cardiovascular Diseases/*etiology ; Female ; Humans ; Male ; Osteoprotegerin/*blood ; *Renal Dialysis ; Renal Insufficiency, Chronic/*therapy ; *Vascular Stiffness

OBJECTIVE: To examine the relationship between Osteoprotegerin gene polymorphisms, and bone mineral density (BMD). METHODS: Restriction fragment length polymorphisms at the Osteoprotegerin A163G (promoter), G1181C (exon 1) gene site, and BMD at the lumbar spine and proximal femur were analyzed in 229 postmenopausal Korean women (81 normal, 111 osteopenic and 37 osteoporotic patients). BMDs were measured by DEXA. RESULTS: The distribution of A163G and G1181C polymorphisms in all postmenopausal women was as follows: AA 54.6%, AG 37.1%, GG 8.3%; GG 52.4%, GC 38.0%, CC 9.6%, respectively. After adjusting for potential confounding factors such as age, BMI, and menopause duration, A163G polymorphism was significantly associated with BMD at the lumbar spine and G1181C polymorphism BMD at the trochanter in all postmenopausal women. A163G polymorphism was significantly associated with BMD at the lumbar spine in normal and osteoporotic patients, and BMD at the femur neck and wards triangle in normal patients. G1181C polymorphism was significantly associated with BMD at the femur neck in osteopenic and osteoporotic patients, and BMD at the wards triangle and trochanter in osteoporotic patients. CONCLUSION: These findings suggest that osteoprotegerin gene polymorphisms may be an important contributor to the variation of BMD among postmenopausal Korean women.
Bone Density ; Female ; Femur ; Femur Neck ; Humans ; Menopause ; Osteoprotegerin* ; Polymorphism, Restriction Fragment Length ; Spine

OBJECTIVE: To determine the serum levels of soluble osteoprotegerin (OPG), decoy receptor of receptor activator of nuclear factor kB ligand (RANKL), in patients with systemic lupus erythematosus (SLE) and to assess the its relationships with certain clinical manifestations. METHODS: Serum levels of OPG in 60 patients with SLE and 30 healthy controls were determined by enzyme-linked immunosorbent assay. At the time of serum sampling, clinical manifestations and lupus disease activity index (SLEDAI) were assessed. RESULTS: Serum levels of OPG in 60 patients with SLE were significantly higher than in 30 healthy controls (1,058+/-699 versus 806+/-113 pg/mL, p=0.008). Patients with active disease had higher levels of OPG levels than those with inactive disease (1,355+/-837 versus 760+/-113 pg/mL, p<0.001). Serum OPG levels correlated with SLEDAI (gamma=0.588, p<0.0001), anti-dsDNA antibody titers (gamma=0.337, p=0.009) and serum MCP-1 levels (gamma=0.485, p<0.0001). In particular, serum OPG levels were found to be significantly increased in patients with neurological manifestation compared to those without (1,504+/-1,152 versus 918+/-376 pg/mL, p=0.004). CONCLUSION: The results of this study suggest that serum OPG levels are increased in patients with SLE. Serum OPG has a role as marker for disease activity and its increased levels reflect the involvement of neurological manifestation.
Enzyme-Linked Immunosorbent Assay ; Humans ; Lupus Erythematosus, Systemic* ; Neurologic Manifestations ; Osteoprotegerin*

OBJECTIVETo investigate the expression of receptor activator of nuclear factor kappaB ligand (RANKL) and osteoprotegerin (OPG) in periapical cyst and periapical granuloma by comparison with the expression in the normal periodontal tissue as control, and to identify their functional mechanism in the bone destruction of periapical cyst and granuloma.

METHODS20 periapical cyst tissues (cyst group), 20 periapical granuloma tissues (granuloma group), and 20 normal periodontal tissues (control group) were collected respectively. Immunohistochemical technology was performed to detect the expression of RANKL and OPG in above three groups.

RESULTSIn cyst group, granuloma group and control group, the expression of RANKL were 75.00 +/- 7.54, 68.40 +/- 6.74 and 29.40 +/- 2.46, respectively. The expression of OPG were 38.10 +/- 7.09, 47.65 +/- 13.85 and 58.60 +/- 5.88, respectively. The differences among the three groups were statistically significant (P<0.05). RANKL and OPG in cysts group were negatively correlated (r=-0.56, P=0.01) and were not correlated with granuloma and control group (P>0.05).

CONCLUSIONRANKL and OPG play roles in the bone absorption of periapical disease. In periapical disease, abnormal expression of RANKL and OPG are detected, RANKL significantly increase, OPG decrease, bone absorption accelerate and osteolytic lesion are observed. In periapical cyst, the bone absorption is more active compared with periapical granuloma.