Correlates of serum leptin and insulin-like growth factor-I concentrations in normal weight and overweight/obese Iranian women

Alireza Ostadrahimi, Tala Moradi, Nosratollah Zarghami, Mohammadali Mohajel Shoja

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Background: Leptin and insulin-like growth factor-I (IGF-I) are two interrelated hormones that are implicated in the development or progression of coronary artery disease (CAD) and some cancers. The aim of this study was to investigate the relation between serum leptin and total IGF-I concentrations and to identify their correlations with age or anthropometric and body composition variables in healthy normal weight and overweight/obese Iranian women. Methods: The percent of body fat (BF%), fat mass (FM), fat-free mass (FFM), and waist/hip ratio (WHR) were determined in 51 healthy normal weight (body mass index [BMI] 18.5-24.9 kg/m2) and 50 overweight/obese (BMI ≥ 25 kg/m 2) Iranian reproductive-age women. Serum leptin and total IGF-I concentrations were measured by double-antibody sandwich assay and enzyme-linked immunosorbent assay (ELISA), respectively. Statistical analysis was performed by Mann-Whitney U test and Spearman's rank-correlation test. Multivariate linear regression analysis was performed with ranked-transformed data to obtain partial correlation coefficient. Results: In this group of healthy, premenopausal Iranian women, variance of serum leptin concentration was independently explained by FM (partial rho = 0.295, p < 0.01), and variance of the total IGF-I concentration was explained by age (partial rho = -0.214, p = 0.037) and BMI (partial rho = 0.229, p = 0.026). Overweight/obese women had higher leptin and total IGF-I concentrations than normal weight women (p < 0.01). The serum leptin and total IGF-I concentrations were differentially correlated with age and anthropometric and body composition variables in the two groups. Whereas in normal weight women, leptin was negatively related to BMI (partial rho = -0.356, p = 0.015), in overweight/obese women, BMI, BF%, and FM independently contributed to the serum leptin variability (partial rho = 0.370, p = 0.013; partial rho = -0.320, p = 0.034; partial rho = 0.421, p < 0.01, respectively). There was a weak association between age and total IGF-I concentration in normal weight women, which did not reach statistical significance (partial rho = -0.255, p = 0.091). None of the variables was associated with the total IGF-I in overweight/obese women (p > 0.05). Conclusions: Although the studied anthropometric and body composition variables could explain approximately half of the leptin variance in Iranian women, they explained only a small proportion of total IGF-I variability. Our results indicated that the serum leptin and total IGF-I concentrations are differentially regulated in healthy normal weight and overweight/obese Iranian women.

Original languageEnglish (US)
Pages (from-to)1389-1397
Number of pages9
JournalJournal of Women's Health
Volume17
Issue number8
DOIs
StatePublished - Oct 1 2008
Externally publishedYes

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Leptin
Insulin-Like Growth Factor I
Weights and Measures
Serum
Fats
Body Composition
Body Mass Index
Waist-Hip Ratio
Nonparametric Statistics
Adipose Tissue
Coronary Artery Disease
Linear Models
Enzyme-Linked Immunosorbent Assay
Regression Analysis
Hormones
Antibodies
Neoplasms

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Correlates of serum leptin and insulin-like growth factor-I concentrations in normal weight and overweight/obese Iranian women. / Ostadrahimi, Alireza; Moradi, Tala; Zarghami, Nosratollah; Mohajel Shoja, Mohammadali.

In: Journal of Women's Health, Vol. 17, No. 8, 01.10.2008, p. 1389-1397.

Research output: Contribution to journalArticle

Ostadrahimi, Alireza ; Moradi, Tala ; Zarghami, Nosratollah ; Mohajel Shoja, Mohammadali. / Correlates of serum leptin and insulin-like growth factor-I concentrations in normal weight and overweight/obese Iranian women. In: Journal of Women's Health. 2008 ; Vol. 17, No. 8. pp. 1389-1397.
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abstract = "Background: Leptin and insulin-like growth factor-I (IGF-I) are two interrelated hormones that are implicated in the development or progression of coronary artery disease (CAD) and some cancers. The aim of this study was to investigate the relation between serum leptin and total IGF-I concentrations and to identify their correlations with age or anthropometric and body composition variables in healthy normal weight and overweight/obese Iranian women. Methods: The percent of body fat (BF{\%}), fat mass (FM), fat-free mass (FFM), and waist/hip ratio (WHR) were determined in 51 healthy normal weight (body mass index [BMI] 18.5-24.9 kg/m2) and 50 overweight/obese (BMI ≥ 25 kg/m 2) Iranian reproductive-age women. Serum leptin and total IGF-I concentrations were measured by double-antibody sandwich assay and enzyme-linked immunosorbent assay (ELISA), respectively. Statistical analysis was performed by Mann-Whitney U test and Spearman's rank-correlation test. Multivariate linear regression analysis was performed with ranked-transformed data to obtain partial correlation coefficient. Results: In this group of healthy, premenopausal Iranian women, variance of serum leptin concentration was independently explained by FM (partial rho = 0.295, p < 0.01), and variance of the total IGF-I concentration was explained by age (partial rho = -0.214, p = 0.037) and BMI (partial rho = 0.229, p = 0.026). Overweight/obese women had higher leptin and total IGF-I concentrations than normal weight women (p < 0.01). The serum leptin and total IGF-I concentrations were differentially correlated with age and anthropometric and body composition variables in the two groups. Whereas in normal weight women, leptin was negatively related to BMI (partial rho = -0.356, p = 0.015), in overweight/obese women, BMI, BF{\%}, and FM independently contributed to the serum leptin variability (partial rho = 0.370, p = 0.013; partial rho = -0.320, p = 0.034; partial rho = 0.421, p < 0.01, respectively). There was a weak association between age and total IGF-I concentration in normal weight women, which did not reach statistical significance (partial rho = -0.255, p = 0.091). None of the variables was associated with the total IGF-I in overweight/obese women (p > 0.05). Conclusions: Although the studied anthropometric and body composition variables could explain approximately half of the leptin variance in Iranian women, they explained only a small proportion of total IGF-I variability. Our results indicated that the serum leptin and total IGF-I concentrations are differentially regulated in healthy normal weight and overweight/obese Iranian women.",
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T1 - Correlates of serum leptin and insulin-like growth factor-I concentrations in normal weight and overweight/obese Iranian women

AU - Ostadrahimi, Alireza

AU - Moradi, Tala

AU - Zarghami, Nosratollah

AU - Mohajel Shoja, Mohammadali

PY - 2008/10/1

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N2 - Background: Leptin and insulin-like growth factor-I (IGF-I) are two interrelated hormones that are implicated in the development or progression of coronary artery disease (CAD) and some cancers. The aim of this study was to investigate the relation between serum leptin and total IGF-I concentrations and to identify their correlations with age or anthropometric and body composition variables in healthy normal weight and overweight/obese Iranian women. Methods: The percent of body fat (BF%), fat mass (FM), fat-free mass (FFM), and waist/hip ratio (WHR) were determined in 51 healthy normal weight (body mass index [BMI] 18.5-24.9 kg/m2) and 50 overweight/obese (BMI ≥ 25 kg/m 2) Iranian reproductive-age women. Serum leptin and total IGF-I concentrations were measured by double-antibody sandwich assay and enzyme-linked immunosorbent assay (ELISA), respectively. Statistical analysis was performed by Mann-Whitney U test and Spearman's rank-correlation test. Multivariate linear regression analysis was performed with ranked-transformed data to obtain partial correlation coefficient. Results: In this group of healthy, premenopausal Iranian women, variance of serum leptin concentration was independently explained by FM (partial rho = 0.295, p < 0.01), and variance of the total IGF-I concentration was explained by age (partial rho = -0.214, p = 0.037) and BMI (partial rho = 0.229, p = 0.026). Overweight/obese women had higher leptin and total IGF-I concentrations than normal weight women (p < 0.01). The serum leptin and total IGF-I concentrations were differentially correlated with age and anthropometric and body composition variables in the two groups. Whereas in normal weight women, leptin was negatively related to BMI (partial rho = -0.356, p = 0.015), in overweight/obese women, BMI, BF%, and FM independently contributed to the serum leptin variability (partial rho = 0.370, p = 0.013; partial rho = -0.320, p = 0.034; partial rho = 0.421, p < 0.01, respectively). There was a weak association between age and total IGF-I concentration in normal weight women, which did not reach statistical significance (partial rho = -0.255, p = 0.091). None of the variables was associated with the total IGF-I in overweight/obese women (p > 0.05). Conclusions: Although the studied anthropometric and body composition variables could explain approximately half of the leptin variance in Iranian women, they explained only a small proportion of total IGF-I variability. Our results indicated that the serum leptin and total IGF-I concentrations are differentially regulated in healthy normal weight and overweight/obese Iranian women.

AB - Background: Leptin and insulin-like growth factor-I (IGF-I) are two interrelated hormones that are implicated in the development or progression of coronary artery disease (CAD) and some cancers. The aim of this study was to investigate the relation between serum leptin and total IGF-I concentrations and to identify their correlations with age or anthropometric and body composition variables in healthy normal weight and overweight/obese Iranian women. Methods: The percent of body fat (BF%), fat mass (FM), fat-free mass (FFM), and waist/hip ratio (WHR) were determined in 51 healthy normal weight (body mass index [BMI] 18.5-24.9 kg/m2) and 50 overweight/obese (BMI ≥ 25 kg/m 2) Iranian reproductive-age women. Serum leptin and total IGF-I concentrations were measured by double-antibody sandwich assay and enzyme-linked immunosorbent assay (ELISA), respectively. Statistical analysis was performed by Mann-Whitney U test and Spearman's rank-correlation test. Multivariate linear regression analysis was performed with ranked-transformed data to obtain partial correlation coefficient. Results: In this group of healthy, premenopausal Iranian women, variance of serum leptin concentration was independently explained by FM (partial rho = 0.295, p < 0.01), and variance of the total IGF-I concentration was explained by age (partial rho = -0.214, p = 0.037) and BMI (partial rho = 0.229, p = 0.026). Overweight/obese women had higher leptin and total IGF-I concentrations than normal weight women (p < 0.01). The serum leptin and total IGF-I concentrations were differentially correlated with age and anthropometric and body composition variables in the two groups. Whereas in normal weight women, leptin was negatively related to BMI (partial rho = -0.356, p = 0.015), in overweight/obese women, BMI, BF%, and FM independently contributed to the serum leptin variability (partial rho = 0.370, p = 0.013; partial rho = -0.320, p = 0.034; partial rho = 0.421, p < 0.01, respectively). There was a weak association between age and total IGF-I concentration in normal weight women, which did not reach statistical significance (partial rho = -0.255, p = 0.091). None of the variables was associated with the total IGF-I in overweight/obese women (p > 0.05). Conclusions: Although the studied anthropometric and body composition variables could explain approximately half of the leptin variance in Iranian women, they explained only a small proportion of total IGF-I variability. Our results indicated that the serum leptin and total IGF-I concentrations are differentially regulated in healthy normal weight and overweight/obese Iranian women.

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