Relationship between the type of hormone replacement therapy and incidence of breast cancer in Korea.

OBJECTIVE: This study aimed to investigate the relationship between hormone replacement therapy (HRT) types and breast cancer (BC) incidence in postmenopausal women in Korea. METHODS: The nested case-control study used data from the National Health Insurance Service database. Among the women aged ≥50 years who menopaused between 2004 and 2007, BC incidence up to 2017 was analyzed in 36,446 women using or having used HRT for >1 year and in 36,446 women who did not use any HRT for more than 1 year. HRT types and duration were classified into three categories. RESULTS: BC risk (BCR) decreased with tibolone use for all ages. With HRT initiation in women aged ≥50 years, BCR was lower with tibolone and estrogen-progestogen therapy. HRT for <3 years showed lower BCR with tibolone, while higher BCR was observed with estrogen-only therapy. BCR was lower in women of all ages on HRT for >5 years than in the control group. CONCLUSIONS: For women in their 50s, tibolone use lowers BCR; for all ages, the use of any HRT for >5 years showed lower BCR in Korea. These divergent results from western countries could be associated with the specific characteristics of BC in Korea.

Seldinger vs modified Seldinger techniques for ultrasound-guided central venous catheterisation in neonates: a randomised controlled trial.

BACKGROUND: Central venous catheterisation in neonates is difficult. The purpose of this study was to compare the Seldinger and modified Seldinger techniques for ultrasound-guided internal jugular vein catheterisation in neonates. METHODS: In this randomised, controlled trial, 120 neonates (≤1 month old) requiring central venous catheterisation under general anaesthesia were allocated into either the Seldinger (n=60) or the modified Seldinger (n=60) group. The primary outcome was the incidence of successful catheterisation on the first attempt. We also assessed the incidences of successful puncture on the first attempt, successful guide wire insertion on the first attempt, and successful final catheterisation. RESULTS: The primary outcome, the incidence of successful catheterisation on the first attempt was higher in the modified Seldinger group than in the Seldinger group (83% vs 65%; relative risk=1.282; 95% confidence interval, 1.032-1.594; P=0.025). The incidence of successful guide wire insertion on the first attempt was also higher in the modified Seldinger group (95% vs 75%; relative risk=1.267; 95% confidence interval, 1.082-1.482; P=0.003). Other incidences did not differ significantly between the groups. CONCLUSIONS: For ultrasound-guided internal jugular vein catheterisation in neonates, the modified Seldinger technique showed superiority over the Seldinger technique in terms of successful catheterisation and guide wire insertion on the first attempt. CLINICAL TRIAL REGISTRATION: NCT02688595.

Flexion decreases the ventilation quality of the Ambu® AuraGain™ laryngeal mask in paralysed children: A prospective randomised crossover study.

BACKGROUND: The influence of different head and neck positions on ventilation with the Ambu® AuraGain™ remains unevaluated in children. This study assessed the influence of different head and neck positions on ventilation with the AuraGain™ in paediatric patients. METHODS: In this prospective, randomised crossover study, children ≤7 years of age who were scheduled for elective surgery under general anaesthesia were enrolled. An AuraGain™ was placed in all patients; mechanical ventilation was performed using a volume-controlled mode with a tidal volume of 10 mL/kg. Respiratory rate was adjusted to maintain a ET CO2 of 35-40 mm Hg. The oropharyngeal leak pressure, expiratory tidal volume, peak inspiratory pressure, ventilation score and fibreoptic bronchoscopic view score were assessed for the neutral head and neck position, and then for the flexed, extended and rotated head and neck positions in a random order. RESULTS: Compared with the neutral position, the oropharyngeal leak pressure increased in the flexed position (P < .001), and decreased in the extended (P = .014) and rotated position (P = .002). The expiratory tidal volume and ventilation score were significantly reduced during flexion (all P < .005), and were comparable among the neutral, extended and rotated positions. The fibreoptic score improved in the extended and rotated position (all P < .001). Only the flexion ventilation score was lower compared with the neutral position (P = .014). CONCLUSIONS: Clinically, the flexed head and neck positions negatively affected ventilation due to obstruction of the airway. Ventilation with AuraGain™ can be effectively performed with the head and neck in the neutral, extended and rotated position in paediatric patients.

The effect of 6% hydroxyethyl starch (130/0.4) on acute kidney injury in paediatric cardiac surgery: a prospective, randomised trial.

We have evaluated the effect of a colloid solution on acute kidney injury in paediatric cardiac surgery. A total of 195 patients were ramdomly divided into an hydroxyethyl starch group and a control group. In the starch group, 6% hydroxyethyl starch 130/0.4 (Volulyte® ) was used as the primary fluid for volume resuscitation but was limited to 30 ml.kg-1 . In the control group, only crystalloid fluid was used during the peri-operative period. The incidence of acute kidney injury, peri-operative transfusion, clinical outcomes and laboratory data were compared. The incidence of acute kidney injury determined by Paediatric Risk, Injury, Failure, Loss, End-stage renal disease (pRIFLE) and Acute Kidney Injury Network (AKIN) criteria were no different between the two groups (starch group 40.8% vs. control group 30.0%; p = 0.150 using pRIFLE; 19.6% vs. 21.1% respectively, p = 0.602 using AKIN). There were no differences in clinical outcomes such as mortality, major adverse events, intensive care unit stay or duration of mechanical ventilation. Clotting time as measured using rotational thromboelastometry (ROTEM) was prolonged, and clot firmness after 10 min and maximal clot firmness were shorter in the starch group compared with the control group after sternal closure. There was no difference in transfusion between the two groups. Patients with acute kidney injury had worse clinical courses than those without acute kidney injury. We conclude that intra-operative use of 6% hydroxyethyl starch 130/0.4 up to 30 ml.kg-1 was not associated with postoperative acute kidney injury in paediatric cardiac patients.

Assessment of dynamic variables of fluid responsiveness to predict desufflation-induced hypotension during paediatric laparoscopic surgery.

BACKGROUND: During laparoscopic surgery in paediatric patients, sudden hypotension may occur following peritoneal desufflation due to hypovolaemia or an acute increase in gastrointestinal venous capacitance by the release of intra-abdominal pressure. This study examined whether dynamic variables of fluid responsiveness during pneumoperitoneum can predict the occurrence of hypotension following desufflation. METHODS: A total of 120 paediatric subjects were prospectively enrolled. A predictor was derived from the initial 83 subjects and validated thereafter in 37 high-risk subjects. The pleth variability index, respiratory variation in the pulse oximetry plethysmographic waveform (ΔPOP), systolic pressure variation and pulse pressure variation during pneumoperitoneum were obtained 1 min before desufflation. Predictors of desufflation-induced hypotension were investigated using the multivariable logistic regression analysis. Predictability was assessed using the area under the receiver-operating characteristic curve (AUC). RESULTS: In the derivation cohort, 27% (n=23) of subjects developed hypotension. Only ΔPOP was found to be a predictor, and showed high predictability of desufflation-induced hypotension [AUC 0.87, P<0.0001, 95% confidence interval (CI): 0.78-0.93]. A ΔPOP cut-off point of 38% predicted hypotension with a sensitivity of 83% and a specificity of 90%. In the validation cohort, 43% (n=16) of subjects developed hypotension, and ΔPOP was verified to be highly predictive of the occurrence of hypotension (AUC 0.90, P<0.0001, 95% CI: 0.76-0.98). The sensitivity and specificity of a ΔPOP cut-off point of 38% to predict hypotension was 88% and 90%, respectively. CONCLUSIONS: The ΔPOP during pneumoperitoneum is useful in predicting desufflation-induced hypotension during paediatric laparoscopic surgery. CLINICAL TRIAL REGISTRATION: NCT02536521.

Effects of an alveolar recruitment manoeuvre guided by lung ultrasound on anaesthesia-induced atelectasis in infants: a randomised, controlled trial.

Atelectasis occurs in the majority of children undergoing general anaesthesia. Lung ultrasound has shown reliable sensitivity and specificity for diagnosing anaesthesia-induced atelectasis. We assessed the effects of a recruitment manoeuvre on atelectasis using lung ultrasound in infants undergoing general anaesthesia. Forty infants, randomly allocated to either a recruitment manoeuvre group or a control group, received volume-controlled ventilation with 5 cmH2 O positive end-expiratory pressure. Lung ultrasound examination was performed twice in each patient, the first a minute after starting mechanical ventilation of the lungs and the second at the end of surgery. Patients in the recruitment manoeuvre group received ultrasound-guided recruitment manoeuvres after each lung ultrasound examination. The incidence of significant anaesthesia-induced atelectasis at the second lung ultrasound examination was less in the recruitment manoeuvre group compared with the control group (25% vs. 80%; p = 0.001; odds ratio (OR) 0.083; 95% confidence interval (CI): 0.019-0.370). The median (IQR [range]) lung ultrasound scores for consolidation and B-lines on the second examination were lower in the recruitment manoeuvre group compared with the control group; 6.0 (3.0-9.3 [0.0-14.0]) vs. 13.5 (11.0-16.5 [8.0-23.0]); p < 0.001 and 6.5 (3.0-12.0 [0.0-28.0]) vs. 15.0 (10.8-20.5 [7.0-28.0]); p < 0.001, respectively. The lung ultrasound scores for consolidation on the first and second examinations showed a negative correlation with age (r = -0.340, p = 0.008; r = -0.380, p = 0.003). We conclude that ultrasound-guided recruitment manoeuvres with positive end-expiratory pressure proved useful in reducing the incidence of anaesthesia-induced atelectasis in infants, although 5 cmH2 O positive end-expiratory pressure alone was not sufficient to eliminate it. In addition, the younger the patient, the more susceptible they were to atelectasis.

Real-time ultrasound-guided axillary vein cannulation in children: a randomised controlled trial.

The axillary vein is a good site for ultrasound-guided central venous cannulation in terms of infection rate, patient comfort and its anatomical relationship with the clavicle and lungs. We compared real-time ultrasound-guided axillary vein cannulation with conventional infraclavicular landmark-guided subclavian vein cannulation in children. A total of 132 paediatric patients were randomly allocated to either ultrasound-guided axillary vein (axillary group) or landmark-guided subclavian vein (landmark group). The outcomes measured were success rate after two attempts, first-attempt success rate, time to cannulation and complication rate. The success rate after two attempts was 83% in the axillary group compared with 63% in the landmark group (odds ratio 2.85, 95%CI 1.25-6.48, p = 0.010). The first-attempt success rate was 46% for the axillary group and 40% for the landmark group (p = 0.274) and median time to cannulation was 156 s for the axillary group and 180 s for the landmark group (p = 0.286). There were no differences in complication rates between the two groups, although three episodes of subclavian artery puncture occurred in the landmark group (p = 0.08). We conclude that axillary vein cannulation using a real-time ultrasound-guided in-plane technique is useful and effective in paediatric patients.

Utility of component analyses in subjects undergoing sublingual immunotherapy for peanut allergy.

BACKGROUND: Sublingual immunotherapy (SLIT) with peanut changes clinical and immune responses in most peanut-allergic individuals, but the response is highly variable. OBJECTIVE: We sought to examine the component-specific effects of peanut SLIT and determine whether peanut component testing could predict the outcome of a double-blind, placebo-controlled food challenge (DBPCFC) after 12 months of peanut SLIT. METHODS: We included 33 subjects who underwent peanut SLIT with a DBPCFC of 2500 mg of peanut protein performed after 12 months of therapy. Plasma samples from baseline and after 12 months of peanut SLIT were assayed using ImmunoCAP for IgE and IgG4 against whole peanut, Ara h 1, Ara h 2, Ara h 3, Ara h 8, and Ara h 9. RESULTS: Following 12 months of SLIT, 10 subjects (30%) passed the DBPCFC without symptoms and were considered desensitized. Subjects that failed the DBPCFC tolerated a median of 460 mg peanut protein (range: 10-1710 mg). The desensitized group had significantly lower baseline levels of IgE against peanut (median 40.8 vs. 231 kUA /L, P = 0.0082), Ara h 2 (median 17 vs. 113 kUA /L, P = 0.0082), and Ara h 3 (median 0.3 vs. 8.5 kUA /L, P = 0.0396). ROC curves indicated that baseline IgE against peanut and Ara h 2 were equally effective at discriminating between the two groups (AUC = 0.7957, P = 0.007752 for both). CONCLUSION AND CLINICAL RELEVANCE: In this cohort of subjects undergoing SLIT for peanut allergy, lower baseline levels of IgE against Ara h 2, Ara h 3, and peanut were associated with successful desensitization.

Intralymphatic treatment of flagellin-ovalbumin mixture reduced allergic inflammation in murine model of allergic rhinitis.

BACKGROUND: Bacterial flagellin, a Toll-like receptor 5 agonist, is used as an adjuvant for immunomodulation. In this study, we aimed to evaluate the effect and its mechanism following intralymphatic administration of OVA-flagellin (FlaB) mixture in the mouse model of allergic rhinitis. MATERIALS AND METHODS: BALB/c mice were sensitized with OVA and treated with an OVA-FlaB mixture via intranasal, sublingual, and intralymphatic routes to evaluate the effect of each treatment. Several parameters for allergic inflammation and its underlying mechanisms were then evaluated. RESULTS: Intralymphatic injection of the OVA-FlaB mixture reduced symptom scores, eosinophil infiltration in the nasal mucosa, and total and OVA-specific IgE levels more significantly than intranasal and sublingual administration. Systemic cytokine (IL-4, IL-5, IL-6, IL-17, and IFN-γ) production and local cytokine (IL-4 and IL-5) production were also reduced significantly after intralymphatic injection with OVA-FlaB. Double intralymphatic injection of the mixture was more effective than single injection. Moreover, the expression of innate cytokines such as IL-25 and IL-33 in nasal epithelial cells was reduced, and the expression of chemokines such as CCL24 (eotaxin-2), CXCL1, and CXCL2 was decreased in the nasal mucosa, suggesting the underlying mechanism for intralymphatic administration of the OVA-FlaB mixture. CONCLUSION: Intralymphatic administration of an OVA-FlaB mixture was more effective in alleviating allergic inflammation than intranasal and sublingual administration in a mouse model of allergic rhinitis. This effect may be attributed to the reduced expression of innate cytokines and chemokines. This treatment modality can be considered as a new therapeutic method and agent.

Ultrasound assessment of gastric volume in children after drinking carbohydrate-containing fluids.

BACKGROUND: Gastric ultrasound is a valid tool for non-invasive assessment of the nature and volume of gastric contents in adults and children. Perioperative fasting guidelines recommend oral carbohydrates up to 2 h before elective surgery. We evaluated gastric volume in children using ultrasound before and after drinking carbohydrate fluids before surgery. METHODS: Paediatric patients younger than 18 yr old undergoing elective surgery were enrolled. Initial ultrasound assessment of gastric volume was performed after fasting for 8 h. Two hours before surgery, patients were given carbohydrate drinks: 15 ml kg(-1) for patients younger than 3 yr old and 10 ml kg(-1) for those more than 3 yr old. Before induction of general anaesthesia, the gastric volume was reassessed. Parental satisfaction scores (0=totally satisfied, 10=totally dissatisfied) and complications were recorded. RESULTS: Of the 86 enrolled patients, 79 completed the study; three refused to ingest the requested volume, and surgery was delayed for more than 2 h in four patients. The mean (sd) of the initial and second ultrasound measurements were 2.09 (0.97) and 1.85 (0.94) cm(2), respectively (P=0.01; mean difference 0.24 cm(2), 95% confidence interval 0.06-0.43). The median (interquartile range) satisfaction score was 2.4 (0-6). Two instances of postoperative vomiting and one instance of postoperative nausea occurred. CONCLUSIONS: Carbohydrate fluids ingested 2 h before surgery reduced the gastric volume and did not cause serious complications in paediatric patients. Parents were satisfied with the preoperative carbohydrate drink. Children may benefit from drinking carbohydrate fluids up to 2 h before elective surgery. CLINICAL TRIAL REGISTRATION: cris.nih.go.kr (KCT0001546).

Effect of early vs. late tracheostomy on clinical outcomes in critically ill pediatric patients.

BACKGROUND: Few studies investigated the optimal timing for tracheostomy and its influence on the clinical outcomes in critically ill pediatric patients. This study evaluated the differences in clinical outcomes between early and late tracheostomy in pediatric intensive care unit (ICU) patients. METHODS: We assessed 111 pediatric patients. Patients who underwent a tracheostomy within 14 days of mechanical ventilation (MV) were assigned to the early tracheostomy group, whereas those who underwent tracheostomy after 14 days of MV were included in the late tracheostomy group. Clinical outcomes, including mortality, duration of MV, length of ICU and hospital stays, and incidence of ventilator-associated pneumonia (VAP) were compared between the groups. RESULTS: Of the 111 pediatric patients, 61 and 50 were included in the early and late tracheostomy groups, respectively. Total MV duration and the length of ICU and hospital stay were significantly longer in the late tracheostomy group than in the early tracheostomy group (all P < 0.01). The VAP rate per 1000 ventilator days before tracheostomy was 2.6 and 3.8 in the early and late tracheostomy groups, respectively. There were no significant differences in mortality rate between the groups. No severe complications were associated with tracheostomy itself. CONCLUSIONS: Tracheostomy performed within 14 days after the initiation of MV was associated with reduced duration of MV and length of ICU and hospital stay. Although there was no effect on mortality rate, children may benefit from early tracheostomy without severe complications.

[Cognitive Behavioral Therapy and Assertive Community Treatment Reduces Days in Hospital and Delays Hospital Admission in Severe Psychotic Disorders]. / Kognitive Verhaltenstherapie und Assertive Community Treatment reduzieren die Anzahl stationärer Tage und verlängern die Zeit bis zu einer stationären Aufnahme bei schweren psychotischen Störungen.

The primary aim of this study was to assess the effectiveness of integrated home treatment (IV, i. e. intensive cognitive behavioral therapy and pharmacotherapy provided within a framework of assertive community treatment) in individuals with severe mental disorders (n = 13) within the German healthcare system. A treatment-as-usual group (TAU, n = 13) was identified by propensity score matching. Symptoms (CGI), functioning (GAF) and service engagement (SES) were assessed. Quality of life (MSLQ-R) was rated by the IV patients. A reduction of days spent in hospital [IV: 2.3 (6.1); TAU: 33.6 (53.6); Z = 45; p = 0.044], time to admission (IV: 384 days 95% CI 309 - 459.1; TAU: 234.9 days 95% CI 127.2 - 342.5; log rank: Chi-square = 4.31, p < 0.05), severity of the illness (p < 0.01), positive symptoms (p < 0.001), and cognitive symptoms (p < 0.05), as well as functioning (p < 0.05) and service engagement (p < 0.05) was observed in IV patients. Despite differences on a descriptive level, differences in total admissions (IV: 15.3%; TAU: 53.8%; odds ratio = 0.155, 95% CI 0.0243 - 1.00) were not significant. A methodological limitation is that symptom ratings were not performed by independent and blinded raters.

Development of operational immunologic tolerance with neonatal gene transfer in nonhuman primates: preliminary studies.

Achieving persistent expression is a prerequisite for effective genetic therapies for inherited disorders. These proof-of-concept studies focused on adeno-associated virus (AAV) administration to newborn monkeys. Serotype rh10 AAV expressing ovalbumin and green fluorescent protein (GFP) was administered intravenously at birth and compared with vehicle controls. At 4 months postnatal age, a second injection was administered intramuscularly, followed by vaccination at 1 year of age with ovalbumin and GFP. Ovalbumin was highest 2 weeks post administration in the treated monkey, which declined but remained detectable thereafter; controls demonstrated no expression. Long-term AAV genome copies were present in myocytes. At 4 weeks, neutralizing antibodies to rh10 were present in the experimental animal only. With AAV9 administration at 4 months, controls showed transient ovalbumin expression that disappeared with the development of strong anti-ovalbumin and anti-GFP antibodies. In contrast, increased and maintained ovalbumin expression was noted in the monkey administered AAV at birth, without antibody development. After vaccination, the experimental monkey maintained levels of ovalbumin without antibodies, whereas controls demonstrated high levels of antibodies. These preliminary studies suggest that newborn AAV administration expressing secreted and intracellular xenogenic proteins may result in persistent expression in muscle, and subsequent vector administration can result in augmented expression without humoral immune responses.

Whole-genome analysis of a patient with early-stage small-cell lung cancer.

We performed whole-genome sequencing (WGS) of a case of early-stage small-cell lung cancer (SCLC) to analyze the genomic features. WGS revealed a lot of single-nucleotide variations (SNVs), small insertion/deletions and chromosomal abnormality. Chromosomes 4p, 5q, 13q, 15q, 17p and 22q contained many block deletions. Especially, copy loss was observed in tumor suppressor genes RB1 and TP53, and copy gain in oncogene hTERT. Somatic mutations were found in TP53 and CREBBP. Novel nonsynonymous (ns) SNVs in C6ORF103 and SLC5A4 genes were also found. Sanger sequencing of the SLC5A4 gene in 23 independent SCLC samples showed another nsSNV in the SLC5A4 gene, indicating that nsSNVs in the SLC5A4 gene are recurrent in SCLC. WGS of an early-stage SCLC identified novel recurrent mutations and validated known variations, including copy number variations. These findings provide insight into the genomic landscape contributing to SCLC development.

Association between changes in body composition and risk of developing Type 2 diabetes in Koreans.

AIMS: To examine the effects of longitudinal changes in fat mass or lean body mass on risk of Type 2 diabetes in Korean adults. METHODS: Participants included 18 687 Korean adults (aged 20-79 years) who underwent routine medical check-ups in 2007-2008 and again in 2011-2012 with a mean (range) of 4.3 (3.0-5.7) years interval. Total fat, fat-free, and soft fat-free masses were determined using bioelectrical impedance. RESULTS: A total of 692 subjects (3.7%) developed Type 2 diabetes during follow-up. Those who developed diabetes had a greater increase in percent body fat (2.9 ± 3.0 vs 2.6 ± 3.2 percentage points, P = 0.043), as well as greater decreases in percent fat-free mass (-3.0 ± 3.3 vs -2.7 ± 3.3 percentage points, P = 0.008) and percent soft fat-free mass (-2.8 ± 3.1 vs -2.4 ± 3.1 percentage points, P = 0.003) compared with those who did not develop diabetes. In multiple logistic regression analysis, an increase in total fat mass of > 10% was associated with an increased odds ratio for diabetes (1.29, 1.05-1.60), and a decreased total fat mass was associated with lower odds ratio (0.75, 0.58-0.96). A loss of total fat-free mass of > 5% (odds ratio 1.08, 0.90-1.30) or an increase in total fat-free mass (odds ratio 0.96, 0.71-1.28) was not significantly associated with the risk of diabetes after adjustments for baseline waist circumference and glucose levels. CONCLUSIONS: These results show that changes in total body fat mass, but not lean body mass, are associated with development of Type 2 diabetes, independently of baseline measures of general or central obesity.

The Impact of Frailty and Surgical Risk on Health-Related Quality of Life After TAVI.

Symptomatic aortic stenosis and frailty reduce health-related quality of life (HrQoL). Transcatheter aortic valve implantation (TAVI) in patients at high to extreme risk has been proven to have a beneficial effect on HrQoL. Currently, TAVI is also considered in patients at intermediate risk. Our meta-analysis investigates whether benefits to HrQoL after TAVI is more pronounced in frail patients and patients at high to extreme vs. intermediate surgical risk. A systematic search of the literature was performed in November 2021 and updated in November 2023 in PUBMED, EMBASE, and the Cochrane Controlled Trials Register. Statistical analysis was performed according to the inverse variance method and the random effects model. A total of 951 studies were assessed, of which 19 studies were included. Meta-analysis showed a mean increase in the Kansas City Cardiomyopathy Questionnaire (KCCQ) score of 29.6 points (6.0, 33.1) in high to extreme risk patients versus 21.0 (20.9, 21.1) in intermediate risk patients (p < 0.00001) and 24.6 points (21.5, 27.8) in frail patients versus 26.8 (20.2, 33.4) in the general TAVI population (p = 0.55). However, qualitative analyses of non-randomized studies showed the opposite results. In conclusion, TAVI improves HrQoL more in high to extreme than intermediate risk patients. Frailty's impact on HrQoL post-TAVI is inconclusive due to varying outcomes in RCTs vs. non-RCTs.

Higher serum uric acid is associated with higher bone mass, lower bone turnover, and lower prevalence of vertebral fracture in healthy postmenopausal women.

UNLABELLED: Higher serum uric acid (UA) was associated with higher bone mass, lower bone turnover, and lower prevalence of vertebral fracture in postmenopausal women. Furthermore, UA suppressed osteoclastogenesis and decreased production of reactive oxygen species in osteoclast precursors, indicating UA may have beneficial effects on bone metabolism as an antioxidant. INTRODUCTION: UA is known to play a physiological role as an antioxidant, and oxidative stress has detrimental effects on bone metabolism. In the present study, we investigated the association of serum UA level with the osteoporosis-related phenotypes and its direct effect on bone-resorbing osteoclasts using in vitro systems. METHODS: This is a large cross-sectional study, including 7,502 healthy postmenopausal women. Bone mineral density (BMD) and serum UA concentrations were obtained from all subjects. Data on bone turnover markers and lateral thoracolumbar radiographs were available for 1,023 and 6,918 subjects, respectively. An in vitro study investigated osteoclastogenesis and reactive oxygen species (ROS) levels according to UA treatment. RESULTS: After adjusting for multiple confounders, serum UA levels were positively associated with BMD at all sites (all p < 0.001). Compared with the participants in the highest UA quartile, the odds for osteoporosis were 40 % higher in those in the lowest quartile. The serum UA levels were inversely related to both serum C-terminal telopeptide of type I collagen and osteocalcin levels (p < 0.001 and p = 0.004, respectively). Consistently, subjects with vertebral fracture had lower serum UA levels, compared with those without it (p = 0.009). An in vitro study showed that UA decreased osteoclastogenesis in a dose-dependent manner and reduced the production of ROS in osteoclast precursors. CONCLUSION: These results provide epidemiological and experimental evidence that serum UA may have a beneficial effect on bone metabolism as an antioxidant in postmenopausal women.

Association between metabolic syndrome and bone loss at various skeletal sites in postmenopausal women: a 3-year retrospective longitudinal study.

UNLABELLED: Although the presence of metabolic syndrome (MetS) and increasing numbers of MetS components were associated with attenuated bone loss at various skeletal sites in postmenopausal women, this beneficial effect of MetS on bone mass can be mainly explained by higher mechanical loading in the affected subjects. INTRODUCTION: Previous cross-sectional epidemiological studies reported the inconsistent results regarding the combined effects of MetS on bone mass. In our present report, we performed a large, longitudinal study to evaluate MetS in relation to annualized bone mineral density (BMD) changes in postmenopausal Korean women. METHODS: The study cohort consisted of 1,218 postmenopausal women who had undergone comprehensive routine health examinations with an average follow-up interval of 3 years. The BMD at the lumbar spine and proximal femur sites was measured with dual-energy X-ray absorptiometry using the same equipment at baseline and at follow-up. RESULTS: Following adjustment for age, baseline BMD, and lifestyle factors, the women with MetS had 21.7, 17.0, 26.7, and 31.1 % less bone loss at the total femur, femur neck, trochanter, and lumbar spine, respectively, compared with MetS-free women (P = 0.004 to 0.041). Consistently, the rates of bone loss at all skeletal sites were linearly attenuated with increasing numbers of MetS components (P = 0.004 to <0.001). Importantly, when weight and height were added as confounding factors, the differences and trends of annualized BMD changes according to the MetS status disappeared. CONCLUSION: Our current results indicate that the beneficial effects of MetS on bone mass can be mainly explained by higher mechanical loading in the affected subjects. Consequently, MetS per se may not be a meaningful concept for predicting future bone loss and for explaining associations between osteoporosis and cardiovascular diseases.

Relative contributions of insulin resistance and ß-cell dysfunction to the development of Type 2 diabetes in Koreans.

AIMS: Controversies still exist regarding the relative contributions of insulin resistance and ß-cell dysfunction to the pathogenesis of Type 2 diabetes in different populations. We examined the associations of baseline insulin resistance and ß-cell function indices with the development of Type 2 diabetes in Koreans. METHODS: We analysed the clinical and laboratory data of 17 878 Korean adults (age 20-79 years) who underwent routine medical examinations with a median interval of 3.5 years (range 2.5-4.7 years). Using the homeostasis model assessment, insulin resistance (HOMA-IR) and ß-cell function (HOMA-%B) indices at baseline were assessed. RESULTS: Those who developed diabetes (n = 732, 4.1%) had significantly higher fasting serum insulin level (53.4 ± 31.2 vs. 41.4 ± 23.4 pmol/l) and HOMA-IR (2.38 ± 1.45 vs. 1.65 ± 1.02) and lower HOMA-%B (74 ± 47 vs. 85 ± 48) at baseline (P < 0.001 for all). Both high HOMA-IR and low HOMA-%B were independently associated with an increased odds ratio of incident Type 2 diabetes. Among the participants who developed diabetes, 29% demonstrated predominant ß-cell dysfunction (HOMA-%B < 25th percentile) and 51% had predominant insulin resistance (HOMA-IR > 75th percentile). When we divided the participants according to the median BMI of the whole population (23.7 kg/m²), 49% of participants in the low BMI group demonstrated predominant ß-cell dysfunction and 26% had predominant insulin resistance, whilst 21% in the high BMI group demonstrated mainly ß-cell dysfunction and 60% had mainly insulin resistance. CONCLUSIONS: In individuals with low BMI, ß-cell dysfunction is the predominant defect, whereas insulin resistance is the predominant pathogenetic factor in individuals with high BMI in the development of Type 2 diabetes in Koreans.

Matrix metalloproteinase-2, -9, -12, and tissue inhibitor of metalloproteinase 2 gene polymorphisms and cutaneous expressions in patients with Behçet's disease.

Matrix metalloproteinases (MMPs) induce leukocyte migration into inflammation sites that lead to either promotion or repression of inflammation by activating or inactivating cytokines. An increased level of MMP-9 and a decreased level of MMP-2 have been observed in Behçet's disease (BD). This study was performed to analyze the relationship between MMP-2, -9, -12 and the tissue inhibitor of metalloproteinase-2 (TIMP-2) promoter polymorphisms in developing BD. The expression of MMP-2 and -9 was also evaluated in the skin of BD. The MMPs and TIMP-2 polymorphisms were confirmed by using polymerase chain reaction-restriction fragment length polymorphism in 251 BD and 312 controls. Cutaneous expression of MMP-2 and -9 in 17 BD patients with erythema nodosum (EN) or EN-like lesion was compared with 14 patients with idiopathic EN by immunohistochemical stains. The frequency of MMP-2-1575*G/*G and MMP-2-735*C/*C genotypes was shown to be lower in BD, whereas MMP-9-1562*C/*C was significantly higher in BD compared with the controls. The frequency of common haplotype MMP-2-1575*G -735*C was significantly lower in BD patients than in controls (P = 0.0046, permutation P = 0.009). No significant differences were observed between BD and controls in the allele and genotype frequencies of MMP-12-82A>G or TIMP-2-418G>C polymorphisms. The tissue expression of MMP-2, shown by immunohistochemistry, was significantly lower in BD compared with the controls. However, the expression of MMP-9 was significantly higher in BD. These results suggest that MMP-2 and -9 could each modulate the development of BD in opposite directions. Major genotypes of the MMP-2-1575*G/*G and MMP-2-735*C/*C and the common MMP-2-1575*G -735*C haplotype may provide some protection against development of BD, while MMP-9-1562*C/*C may promote the disease. The reciprocal expression of MMP-2 and -9 in the skin tissue of BD was also confirmed.