scholarly journals Associations between Sclerostin and Anthropometric and Metabolic Parameters in Children and Adolescents

Children ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 788
Author(s):  
Shin-Hee Kim ◽  
Yun Jung Choi ◽  
Moon Bae Ahn ◽  
Won Kyoung Cho ◽  
Kyoung Soon Cho ◽  
...  
Keyword(s):  
Children And Adolescents ◽  
Metabolic Parameters ◽  
Model Assessment ◽  
Obese Patients ◽  
Fasting Insulin ◽  
Anthropometric Parameters ◽  
25 Hydroxy Vitamin D ◽  
Healthy Control ◽  
Vitamin D 3 ◽  
And Control

(1) Background: Bone plays an important role in the regulation of the systemic glucose and energy metabolism. Sclerostin, secreted by osteocytes, is an inhibitor of the Wnt/β–catenin bone metabolic pathway, and is involved in osteoporosis and metabolic disease. The aim of this study was to investigate the relationship between sclerostin and anthropometric and metabolic parameters in children and adolescents with obesity or who are overweight. (2) Methods: This study included 63 children and adolescents (20 obese, 11 overweight and 32 healthy control subjects). We evaluated the correlation between serum sclerostin and anthropometric parameters, metabolic parameters related to glucose (homeostasis model assessment of insulin resistance [HOMA–IR]), lipid, and bone metabolism (osteocalcin and 25-hydroxy vitamin D). (3) Results: Sclerostin and osteocalcin levels did not differ between obese and control groups. Sclerostin level was higher in boys than in girls (median 20.7 vs. 18.9 pmol/L, respectively; p = 0.04). In all subjects, sclerostin levels were negatively correlated with fasting insulin (r = −0.26; p = 0.04) and HOMA–IR (r = −0.28; p = 0.03), and positively correlated with serum concentrations of triglycerides (r = 0.29; p = 0.04), alkaline phosphatase (r = 0.41; p = 0.002), and osteocalcin (r = 0.33; p = 0.008). In obese patients, sclerostin levels were correlated negatively with fasting glucose (r = −0.49; p = 0.03) and HOMA–IR (r = −0.48; p = 0.03) and positively correlated with triglyceride levels (r = 0.53; p = 0.02). In the healthy control, sclerostin levels were correlated negatively with fasting insulin levels (r = −0.61; p < 0.001) and HOMA–IR (r = −0.36; p = 0.04). After adjusting for age, sex, and height SDS, a negative correlation between sclerostin and HOMA–IR was found (r = −0.39; p = 0.003) in all of the subjects. This association was more evident in obese patients (r = −0.60; p = 0.01) than in healthy controls (r = −0.39; p = 0.047). (4) Conclusions: Among children and adolescents with obesity, serum sclerostin was negatively correlated with HOMA–IR. Further studies are needed to clarify the mechanisms involved to understand how sclerostin affects the glucose metabolism.

scholarly journals The association of circulating irisin with metabolic risk factors in Chinese adults: a cross-sectional community-based study

2019 ◽  
Author(s):  
Lizhi Tang ◽  
Yuzhen Tong ◽  
Fang Zhang ◽  
Guilin Chen ◽  
Yun Cong Zhang ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Linear Regression ◽  
Pearson Correlation ◽  
Metabolic Parameters ◽  
Enzyme Linked Immunosorbent Assay ◽  
Model Assessment ◽  
Fasting Insulin ◽  
Cross Sectional ◽  
Sectional Analysis ◽  
Overweight Subjects

Abstract Background Irisin is a myokine that leads to increased energy expenditure by stimulating the browning of white adipose tissue. We aimed to investigate the association of serum irisin levels with metabolic parameters in middle aged Chinese population. Methods The study was based on a cross-sectional analysis of data from 524 nondiabetic subjects aged 40~65. All participants were recruited from a screening survey for Metabolic Syndrome in a community in Southwest China, including 294 subjects categorized as overweight (defined as BMI≧25 kg/m2 ) and 230 subjects as normal control (defined as 18.5≦BMI<25 kg/m2). Serum irisin concentration was quantified by enzyme linked immunosorbent assay (ELISA). The relationship of irisin with metabolic factors was determined by Pearson correlation. Multivariate linear regression was used to analyze the association of irisin with insulin resistance. Logistic regression was performed to assess the association of irisin with odds of overweight. Results Serum irisin levels were significantly lower in nondiabetic overweight subjects compared with control (11.46 ± 4.11vs14.78 ± 7.03µg/mL, p = 0.02). Circulating irisin was positively correlated with quantitative insulin sensitivity check index (QUICKI, r = 0.178, p = 0.045) and triglycerides (r = 0.149, p = 0.022); while irisin was negatively correlated with waist circumference (WC, r = -0.185, p = 0.037), waist-to-hip ratio (WHR, r = -0.176, p = 0.047), fasting insulin (r = -0.2, p = 0.024), serum creatinine (r = -0.243, p = 0.006), homeostasis model assessment for insulin resistance (HOMA-IR, r = -0.189, p = 0.033). Multiple linear regression showed that irisin was inversely associated with HOMA-IR (β = -0.342 ± 0.154, p = 0.029). Higher irisin was associated with decreased odds of being overweight (OR = 0.281, β = -1.271, p = 0.024). Conclusions We found that serum irisin levels were lower in overweight subjects. Moreover, serum irisin levels were inversely correlated with adverse metabolic parameters including WC, WHR, creatinine, HOMA-IR and fasting insulin, suggesting that irisin may play a role in obesity related insulin resistance.

scholarly journals Association of Vitamin D Status and Cardio-Metabolic Risk Factors in Children and Adolescents: The CASPIAN-V Study

2020 ◽  
Author(s):  
Mostafa Qorbani ◽  
Motahar Heidari-Beni ◽  
Hanieh-Sadat Ejtahed ◽  
Gita Shafiee ◽  
Farid Goodarzi ◽  
...  
Keyword(s):  
Vitamin D ◽  
Children And Adolescents ◽  
Vitamin D Deficiency ◽  
Communicable Disease ◽  
Pediatric Population ◽  
Surveillance Program ◽  
Cross Sectional ◽  
Low Hdl ◽  
25 Hydroxy Vitamin D ◽  
And Control

Abstract Background: Metabolic syndrome (MetS) starts from early life, and is one of the important underlying factors for non-communicable disease (NCDs) in adulthood. Controversial evidence exists on the role of vitamin D deficiency in increasing risk of pediatric MetS. Objective: This study aimed to assess the relationship between vitamin D level with MetS and its components in children and adolescents. Methods: This cross-sectional nationwide study was performed as part of a surveillance program in Iran. Participants were 2596 students, aged 7 to 18 years, living in 30 provinces. In addition to filling questionnaires, physical examination was conducted, and blood samples were collected. Serum concentration of 25-hydroxy vitamin D (25(OH)D) was measured using direct competitive immunoassay chemiluminescene method.Results: 2596 students with mean age of 12.2 y (55.1% boys) were recruited. Prevalence of vitamin D deficiency and insufficiency in participants was 10.6% (n=276), and 60.5% (n=1570), respectively. Prevalence of MetS was higher in vitamin D deficient group. Students with deficient vitamin D level had higher odds of MetS (OR: 4.25, 95%CI: 2.26-7.98), abdominal obesity (OR: 2.24, 95%CI: 1.61-3.12), low HDL-C (OR: 1.65, 95%CI: 1.18-2.30) and high fasting blood sugar (OR: 2.56, 95%CI: 1.43-4.57) in comparison to those with sufficient level of vitamin D.Conclusion: Vitamin D deficiency was associated with increased odds of MetS and its components in Iranian pediatric population. These findings underscore the importance of prevention and control of vitamin D deficiency in preventative programs against NCDs.

scholarly journals Metabolic Profiles in Obese Children and Adolescents with Insulin Resistance

2018 ◽  
Vol 6 (3) ◽  
pp. 511-518 ◽  
Author(s):  
Marko Kostovski ◽  
Viktor Simeonovski ◽  
Kristina Mironska ◽  
Velibor Tasic ◽  
Zoran Gucev
Keyword(s):  
Insulin Resistance ◽  
Children And Adolescents ◽  
Plasma Glucose ◽  
Metabolic Profile ◽  
Total Serum ◽  
Model Assessment ◽  
Fasting Insulin ◽  
Obese Children ◽  
Insulin Resistant ◽  
Study Results

BACKGROUND: In the past several decades, the increasing frequency of overweight and obese children and adolescents in the world has become a public health problem. It has contributed significantly to the already high tide of diabetes, cardiovascular and cerebrovascular diseases.AIM: To investigate the frequency of insulin resistance and to evaluate the metabolic profile of insulin resistant and non-insulin resistant obese children and adolescents.SUBJECTS AND METHODS: The study included 96 (45 boys, 51 girls) obese children and adolescents aged     4-17 years old (10.50 ± 2.87 years). Only participants with Body Mass Index ≥ 95 percentile were included.  We analysed sera for fasting insulin levels (FI), fasting serum triglycerides (TG), total serum cholesterol (TC), fasting plasma glucose (FPG) and plasma glucose 2 hours after the performance of the oral glucose tolerance test        (2-h G). Homeostatic model assessment for insulin resistance (HOMA-IR) index was calculated as fasting insulin concentration (microunits per millilitre) x fasting glucose concentration (millimolar)/22.5. The value of HOMA-IR above 3.16 was used as a cut-off value for both genders.RESULTS: Insulin resistance was determined in 58.33% of study participants. Insulin resistant participants had significantly higher level of 2-h G (p = 0.02), FI level (p = 0.000) as well as TG levels (p = 0.01), compared to non-insulin resistant group. Strikingly, 70.73% of the pubertal adolescents were insulin resistant in comparison to 49.09% of the preadolescents (p = 0.03). Significantly higher percentage of insulin-resistant participants were girls (p = 0.009). Moreover, a higher percentage of the girls (70.59%) than boys (44.44%) had HOMA-IR above 3.16 and had elevated FI levels (70.59% vs 48.89%). The difference in the frequency of insulin resistance among obese versus severely obese children and adolescents was not significant (p = 0.73, p > 0.05). Our study results also showed positive, but weak, correlation of HOMA-IR with age, FPG, TG and BMI of the participants (p < 0.05).CONCLUSION: Higher percentage of insulin-resistant participants was of female gender and was adolescents. In general, insulin resistant obese children and adolescents tend to have a worse metabolic profile in comparison to individuals without insulin resistance. It is of note that the highest insulin resistance was also linked with the highest concentrations of triglycerides.

scholarly journals Shedding “LIGHT” on the Link between Bone and Fat in Obese Children and Adolescents

2020 ◽  
Vol 21 (13) ◽  
pp. 4739 ◽  
Author(s):  
Giacomina Brunetti ◽  
Maria Felicia Faienza ◽  
Laura Piacente ◽  
Giuseppina Storlino ◽  
Angela Oranger ◽  
...  
Keyword(s):  
Children And Adolescents ◽  
Peripheral Blood ◽  
Mononuclear Cells ◽  
Standard Deviation Score ◽  
Serum Levels ◽  
Model Assessment ◽  
Obese Patients ◽  
Z Score ◽  
Obese Children ◽  
Peripheral Blood Mononuclear

Obesity may affect bone health, but literature reports are contradictory about the correlation of body mass index (BMI) and bone markers. LIGHT, one of the immunostimulatory cytokines regulating the homeostasis of bone and adipose tissue, could be involved in obesity. The study involved 111 obese subjects (12.21 ± 3.71 years) and 45 controls. Patients underwent the evaluation of bone status by quantitative ultrasonography (QUS). LIGHT amounts were evaluated in sera by ELISA, whereas its expression on peripheral blood cells was evaluated by flow cytometry. Osteoclastogenesis was performed by culturing peripheral blood mononuclear cells (PBMCs) with or without anti-LIGHT antibodies. Obese patients showed significant high BMI-standard deviation score (SDS), weight-SDS, and Homeostatic model assessment for insulin resistance (HOMA-IR) that negatively correlated with the reduced Amplitude Dependent Speed of Sound (AD-SoS)-Z-score and Bone Transmission Time (BTT-Z)-score. They displayed significantly higher serum levels of LIGHT compared with controls (497.30 ± 363.45 pg/mL vs. 186.06 ± 101.41 pg/mL, p < 0.001). LIGHT expression on monocytes, CD3+-T-cells, and neutrophils was also higher in obese patients than in the controls. Finally, in PBMC cultures, the addition of anti-LIGHT antibodies induced a significant osteoclastogenesis inhibition. Our study highlighted the high serum levels of LIGHT in obese children and adolescents, and its relationship with both the grade of obesity and bone impairment.

scholarly journals Ultra-Early and Early Changes in Bile Acids and Insulin after Sleeve Gastrectomy among Obese Patients

Medicina ◽  
2019 ◽  
Vol 55 (12) ◽  
pp. 757
Author(s):  
Adriana Florinela Cӑtoi ◽  
Alina Elena Pârvu ◽  
Aurel Mironiuc ◽  
Horațiu Silaghi ◽  
Ioana Delia Pop ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Body Mass Index ◽  
Sleeve Gastrectomy ◽  
Model Assessment ◽  
Obese Patients ◽  
Fasting Insulin ◽  
Homeostasis Model Assessment ◽  
Insulin Homeostasis ◽  
Obese Subjects ◽  
Time Point

Background and Objective: In obese patients, sleeve gastrectomy (SG) has shown mixed results on bile acid (BA) values. The aim of our study was to examine the potential ultra-early and early changes of the circulating total BA in relation with the changes of insulin resistance (IR) in obese patients submitted to laparoscopic SG. Materials and Methods: Twenty-four obese subjects were investigated for body mass index (BMI), total fasting BA, insulin, homeostasis model assessment of insulin resistance (HOMA-IR), and leptin before and at 7 and 30 d after SG. Results: After surgery, mean BMI decreased at the first (p < 0.001) and at the second time point (p < 0.001) relative to baseline. Total fasting BA values did not change significantly at 7 d (p = 0.938) and at 30 d (p = 0.289) after SG. No significant changes were found at 7 d (p = 0.194, p = 0.34) and 30 d (p = 0.329, p = 0.151) after surgery regarding fasting insulin and HOMA-IR, respectively. However, a trend of increased total fasting BA and decreased fasting insulin and HOMA- after laparoscopic SG has been found. Negative correlations between total fasting BA and insulin (r = −0.807, p = 0.009), HOMA-IR (r = −0.855, p = 0.014), and blood glucose (r = −0.761, p = 0.047), respectively, were observed at one month after SG. Conclusion: In conclusion, here, we found a lack of significant changes in total fasting BA, insulin, and HOMA-IR ultra-early and early after SG, which precluded us to consider a possible relation between the variations of BA and IR. However, the presence of the tendency for total fasting BA to increase and for insulin and HOMA-IR to decrease, as well as of the negative correlations one month after laparoscopic SG, suggest that this surgery brings about some changes that point towards the existence, and possibly towards the restoration, at least to some extent, of the link between BA and glucose metabolism.

scholarly journals Relation Between Levels of Leptine and Metabolic Parameters in Children and Adolescents

2018 ◽  
Vol 10 (11) ◽  
pp. 161
Author(s):  
Omar Pérez-Álvarez ◽  
Edgar Navarro-Lechuga ◽  
María del Pilar Garavito-Galofre ◽  
Eduardo Navarro-Jiménez
Keyword(s):  
Nutritional Status ◽  
Lipid Profile ◽  
Children And Adolescents ◽  
Statistical Significance ◽  
Univariate Analysis ◽  
Metabolic Parameters ◽  
Bivariate Analysis ◽  
Anthropometric Parameters ◽  
Study Laboratory ◽  
The Relationship

OBJECTIVE: To determine the relationship between leptin levels and metabolic parameters in children and adolescents. METHODS: Descriptive cross-sectional study. Laboratory biochemical values ​​and anthropometric parameters were determined. Univariate analysis was performed with measurements of frequencies and percentages and bivariate analysis through statistical significance tests (p &lt;0.05). In case of multiple comparisons, the Bonferroni correction was made. RESULTS: There were higher levels of leptin to higher adipose tissue, while in the metabolic parameters a relationship was observed between high levels of glycemia and leptin independent of the variables gender, age group and nutritional status. There was no clear relationship between high levels of leptin and those of the lipid profile. CONCLUSIONS: There was a relationship between leptin concentrations and nutritional status and in the relationship of leptin with the metabolic parameters studied, there was an association with glycemia, while this association was not clear with the lipid profile.

scholarly journals Dynamic Thiol/Disulphide Homeostasis in Children and Adolescents with Non-Autoimmune Subclinical Hypothyroidism

2018 ◽  
Vol 27 (1) ◽  
pp. 44-48 ◽  
Author(s):  
Seyit Ahmet Uçaktürk ◽  
Murat Alışık ◽  
Çağatay Uğur ◽  
Selin Elmaoğulları ◽  
Eda Mengen ◽  
...  
Keyword(s):  
Children And Adolescents ◽  
Subclinical Hypothyroidism ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Thyroid Stimulating Hormone ◽  
Thyroid Peroxidase ◽  
Control Subjects ◽  
The Status ◽  
Healthy Control ◽  
And Control

Objective: To evaluate the thiol/disulphide homeostasis in children with non-autoimmune subclinical hypothyroidism (SHT). Subjects and Methods: Thiol/disulphide homeosta sis, involving native thiol (SH), disulphide (SS), and total thiol (SS + SH), was evaluated in 60 children and adolescents who were negative for thyroid auto-antibodies (anti-thyroid peroxidase, anti-thyroglobulin) and had a thyroid-stimulating hormone (TSH) value of > 5 mIU/L, and in 40 sex- and age-matched healthy control subjects who were negative for thyroid autoantibodies and had normal TSH levels. Lipid profiles and urine iodine levels were also determined. Results: SH (466 ± 32.8 vs. 462 ± 32.1 μmol/L p = 0.59), SH + SS (508 ± 34.0 vs. 506 ± 32.7 μmol/L, p = 0.81), SS (21 ± 5.5 vs. 22 ± 5.8 μmol/L, p = 0.41), SS/SH (4.5 ± 1.2 vs. 4.8 ± 1.3%, p = 0.36), SS/SH + SS (4.1 ± 1.0 vs. 4.3 ± 1.1%, p = 0.36) and SH/SH + SS (91 ± 2.1 vs. 91 ± 2.1%, p = 0.31) levels were similar in children with SHT and control subjects (p > 0.05). There was no difference between total cholesterol, triglyceride, and low-density lipoprotein levels in SHT patients and controls. No difference was detected between the patients with or without iodine deficiency in the SHT group in terms of thiol/disulphide homeostasis parameters. Conclusion: The status of dynamic thiol/disulphide homeostasis did not change in children and adolescents with non-autoimmune SHT. Future studies are needed for the evaluation of oxidative stress in patients with long-standing non-autoimmune SHT.

scholarly journals Possible Role of Hyperinsulinemia and Insulin Resistance in Lower Vitamin D Levels in Overweight and Obese Patients

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Giovanni De Pergola ◽  
Alessandro Nitti ◽  
Nicola Bartolomeo ◽  
Antonella Gesuita ◽  
Vito Angelo Giagulli ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Vitamin D ◽  
Waist Circumference ◽  
Hdl Cholesterol ◽  
Significant Negative Correlation ◽  
Model Assessment ◽  
Obese Patients ◽  
Fasting Insulin ◽  
Vitamin D Levels ◽  
Independent Association

A cohort of 66 healthy overweight and obese patients, 53 women and 13 men were examined. Waist circumference and fasting 25(OH)D, insulin, glucose, lipid (cholesterol, HDL cholesterol, and triglyceride), C-reactive protein (CRP), and complement 3 (C3), and 4 (C4) serum concentrations were measured. Insulin resistance was assessed by the homeostasis model assessment (HOMAIR).Results.25(OH)D levels showed a significant negative correlation with BMI (P<0.01), waist circumference (P<0.05), fasting insulin (P<0.01), HOMAIR(P<0.01), triglycerides (P<0.01), CRP (P<0.01), C3(P<0.05), and C4(P<0.05). Multiple regression analyses were performed with 25(OH)D as the dependent variable and BMI (or waist circumferences), fasting insulin (or HOMAIR), triglycerides, and CRP (or C3or C4) as independent variables. Only insulin or HOMAIRmaintained a significant independent association with 25(OH)D levels, whereas vitamin D did not maintain a significant independent association with CRP or C3or C4concentrations.Conclusions.The present study, performed in overweight and obese subjects, shows that 25(OH)D levels are negatively associated with inflammatory parameters such as CRP and C3and C4levels, but not independently of BMI, body fat distribution, insulin levels, or insulin resistance. Our results suggest that hyperinsulinemia and/or insulin resistance are directly responsible for decrease of 25(OH)D levels in obesity.

scholarly journals The association of circulating irisin with metabolic risk factors in Chinese adults: a cross-sectional community-based study

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Lizhi Tang ◽  
Yuzhen Tong ◽  
Fang Zhang ◽  
Guilin Chen ◽  
Yun Cong Zhang ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Linear Regression ◽  
Pearson Correlation ◽  
Metabolic Parameters ◽  
Enzyme Linked Immunosorbent Assay ◽  
Model Assessment ◽  
Fasting Insulin ◽  
Cross Sectional ◽  
Sectional Analysis ◽  
Overweight Subjects

Abstract Background Irisin is a myokine that leads to increased energy expenditure by stimulating the browning of white adipose tissue. We aimed to investigate the association of serum irisin levels with metabolic parameters in middle aged Chinese population. Methods The study was based on a cross-sectional analysis of data from 524 nondiabetic subjects aged 40~65. All participants were recruited from a screening survey for Metabolic Syndrome in a community in Southwest China, including 294 subjects categorized as overweight (defined as BMI≧25 kg/m2) and 230 subjects as normal control (defined as 18.5≦BMI < 25 kg/m2). Serum irisin concentration was quantified by enzyme linked immunosorbent assay (ELISA). The relationship of irisin with metabolic factors was determined by Pearson correlation. Multivariate linear regression was used to analyze the association of irisin with insulin resistance. Logistic regression was performed to assess the association of irisin with odds of overweight. Results Serum irisin levels were significantly lower in nondiabetic overweight subjects compared with control (11.46 ± 4.11vs14.78 ± 7.03 μg/mL, p = 0.02). Circulating irisin was positively correlated with quantitative insulin sensitivity check index (QUICKI, r = 0.178, p = 0.045) and triglycerides (r = 0.149, p = 0.022); while irisin was negatively correlated with waist circumference (WC, r = − 0.185, p = 0.037), waist-to-hip ratio (WHR, r = − 0.176, p = 0.047), fasting insulin (r = − 0.2, p = 0.024), serum creatinine (r = − 0.243, p = 0.006), homeostasis model assessment for insulin resistance (HOMA-IR, r = − 0.189, p = 0.033). Multiple linear regression showed that irisin was inversely associated with HOMA-IR (β = − 0.342 ± 0.154, p = 0.029). Higher irisin was associated with decreased odds of being overweight (OR = 0.281, β = − 1.271, p = 0.024). Conclusions We found that serum irisin levels were lower in overweight subjects. Moreover, serum irisin levels were inversely correlated with adverse metabolic parameters including WC, WHR, creatinine, HOMA-IR and fasting insulin, suggesting that irisin may play a role in obesity related insulin resistance.

scholarly journals The association of circulating irisin with metabolic risk factors in Chinese adults: a cross-sectional community-based study

2019 ◽  
Author(s):  
Lizhi Tang ◽  
Yuzhen Tong ◽  
Fang Zhang ◽  
Guilin Chen ◽  
Yun Cong Zhang ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Linear Regression ◽  
Pearson Correlation ◽  
Metabolic Parameters ◽  
Enzyme Linked Immunosorbent Assay ◽  
Model Assessment ◽  
Fasting Insulin ◽  
Cross Sectional ◽  
Sectional Analysis ◽  
Overweight Subjects

Abstract Background Irisin is a myokine that leads to increased energy expenditure by stimulating the browning of white adipose tissue. We aimed to investigate the association of serum irisin levels with metabolic parameters in middle aged Chinese population.Methods The study was based on cross-sectional analysis of data from 524 nondiabetic subjects aged 40~65. All participants were recruited from a screening survey for Metabolic Syndrome in a community in Southwest China, including 294 subjects categorized as overweight (defined as BMI≧25 kg/m 2 ) and 230 subjects as normal control (defined as 18.5≦BMI<25 kg/m 2 ). Serum irisin concentration was quantified by enzyme linked immunosorbent assay (ELISA). The relationship of irisin with metabolic factors was determined by Pearson correlation. Multivariate linear regression was used to analyze the association of irisin with insulin resistance. Logistic regression was performed to assess the association of irisin with odds of overweight.Results Serum irisin levels were significantly lower in nondiabetic overweight subjects compared with control (11.46±4.11vs14.78±7.03µg/mL, p=0.02). Circulating irisin was positively correlated with quantitative insulin sensitivity check index (QUICKI, r=0.178, p=0.045) and triglycerides (r=0.149, p=0.022); while irisin was negatively correlated with waist circumference (WC, r=-0.185, p=0.037), waist-to-hip ratio (WHR, r=-0.176, p=0.047), fasting insulin (r=-0.2, p=0.024), serum creatinine (r=-0.243, p=0.006), homeostasis model assessment for insulin resistance (HOMA-IR, r=-0.189, p=0.033). Multiple linear regression showed that irisin was inversely associated with HOMA-IR (β=-0.342±0.154, p=0.029). Higher irisin was associated with decreased odds of being overweight (OR=0.281, β=-1.271, p=0.024).Conclusions We found that serum irisin levels were lower in overweight subjects. Moreover, serum irisin levels were inversely correlated with adverse metabolic parameters including WC, WHR, creatinine, HOMA-IR and fasting insulin, suggesting that irisin may play a role in obesity related insulin resistance.

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