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vol. 13
Clinical research

Bioavailable testosterone is independently associated with Fatty Liver Index in postmenopausal women

Aleksandra Klisic
Nebojsa Kavaric
Milovan Jovanovic
Ivan Soldatovic
Najdana Gligorovic-Barhanovic
Jelena Kotur-Stevuljevic

Arch Med Sci 2017; 13, 5: 1188–1196
Online publish date: 2017/07/19
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Non-alcoholic fatty liver disease (NAFLD) is the commonest form of a broad spectrum of conditions ranging from simple steatosis to inflammation and fibrosis, resulting in non-alcoholic steatohepatitis and cirrhosis, and affects 20–30% of the general population [1].
Liver disease is an early predictor of diabetes mellitus type 2 (DM2) [2] and cardiovascular disease (CVD) [3].
Recent reports show that the prevalence of NAFLD is higher in postmenopausal women than those in a premenopausal state [4, 5] and that postmenopause is a risk factor for NAFLD [6]. One possible explanation may lie in the fact that women after menopause have increased insulin resistance (IR) and visceral abdominal fat, which are the major contributors to NAFLD development [4, 7].
Postmenopausal women experience estrogen deficiency and relative androgen excess, which might lead to redistribution of total body fat toward increase of visceral fat with consequent development of IR [8]. It is speculated that not estrogen deficiency by itself, but rather androgen excess, might be the main culprit for such pathophysiological changes, since exogenous administration of androgens to women has been demonstrated to lead to development of IR [8, 9]. On the other hand, administration of estradiol in postmenopausal women did not show any benefits [10, 11]. In line with this, the increased prevalence of NAFLD in patients with polycystic ovarian syndrome (PCOS) is explained by androgen excess, also [12].
Due to its invasive diagnostic nature, liver biopsy as the gold standard for NAFLD [13] has been replaced with abdominal ultrasonography, as the commonest technique for NAFLD assessment in clinical trials. In line with this, Bedogni et al. [14] developed the Fatty Liver Index (FLI), a simple and accurate predictor of hepatic steatosis that was derived in a general population-based study which highly correlated with abdominal ultrasonography. It has been reported that NAFLD assessed by FLI was an independent risk factor for new-onset hypertension [1], DM2 [15], and CVD [16].
Previous studies have examined the correlation between hyperandrogenemia and NAFLD and showed either no relationship [17, 18] or an independent association between testosterone level and NAFLD [19, 20].
Taking all these contradictory results into account, the aim of our study was to evaluate the relationship between testosterone level (e.g., total, free and bioavailable form) and FLI, as a surrogate marker for NAFLD, in a cohort of postmenopausal women. In addition, we aimed to examine a cluster of other biomarkers (e.g., adipokines, inflammation markers, insulin resistance markers and sex hormones) that might make a significant contribution to fatty liver assessment.

Material and methods


The study enrolled a total of 150 postmenopausal women (mean age: 56.6 ±4.8 years) who volunteered to participate in the study. Participants were consecutively recruited in the study when seeking gynecologic healthcare in the Primary Health Care Center in Podgorica, Montenegro for their regular check-up, in the period from October 2012 to May 2013. Menopause is defined as the absence of menstrual bleeding for more than 1 year. All the participants completed a questionnaire including demographic characteristics, somatic illnesses, smoking history and current medications use. Medical history and clinical examinations were carried out on the same day.
Inclusion criteria were: menopausal status, no hormone replacement therapies, no signs and symptoms of acute inflammatory disease, no history or the presence of malignancy, and non-smoking. Exclusion criteria were: ethanol consumption > 20 g/day, liver disease (cirrhosis, viral hepatitis, autoimmune hepatitis, primary sclerosing cholangitis, primary biliary cirrhosis and overlap syndromes, drug-induced liver disease, hemochromatosis, Wilson’s disease, 1-antitrypsin deficiency), diabetes mellitus, hypothyroidism or hyperthyroidism, renal dysfunction, cardiovascular disorders, and medications use (antihypertensive, lipid-lowering, hypoglycemic, anti-inflammatory medications, hormonal replacement therapy or any medications that can affect liver function) in the last 6 months.
Participants were instructed not to perform any vigorous physical activity the day before the blood samples were taken. All the participants provided written informed consent. The study protocol was approved by the Ethical Committee of Primary Health Care Center in Podgorica, Montenegro, and the research was carried out in compliance with the Declaration of Helsinki [21].

Anthropometric measurements

Basic anthropometric measurements – body height (cm), body weight (kg) and waist circumference (WC) (cm) – were obtained in the morning. Weight was measured to the nearest 0.1 kg on a balance beam scale, with the subjects barefoot and with light clothing. Height was measured to the nearest 0.1 cm using a wall-mounted stadiometer, without shoes. Waist circumference was measured with non-stretchable tape over the unclothed abdomen at the midpoint between the lowest rib and the iliac crest. Measurements were made at the end of normal expiration. The tape was parallel to the floor and did not compress the skin. Body mass index (BMI) was calculated as weight in kilograms divided by height in meters squared (kg/m2).
Although our obese postmenopausal women comprised slightly obese (overweight, 25 ≤ BMI < 30 kg/m2) and moderately obese subjects (30 ≤ BMI < 40 kg/m2), for reasons of simplicity, we referred to them as overweight/obese women.
Blood pressure was measured with a sphygmomanometer after the subject had been seated for 15 min. The average of three measurements taken on the right arm was recorded. All measurements were taken by the same trained evaluator.
Participants who met at least three of the following conditions were diagnosed with metabolic syndrome (MetS): WC ≥ 80 cm, hyperglycemia ≥ 5.6 mmol/l; high-density lipoprotein cholesterol (HDL-c) < 1.30 mmol/l; triglycerides ≥ 1.70 mmol/l and hypertension: systolic blood pressure (SBP) or diastolic blood pressure (DBP) ≥ 130/85 mm Hg [22].
Non-alcoholic fatty liver disease is assessed by the FLI, an algorithm based on body mass index, waist circumference, triglycerides and gamma-glutamyl transferase, as a simple and accurate predictor of hepatic steatosis. The FLI was calculated for each individual subject in accordance with the score sheet available as an on-line calculator at http://www.medicalalgorithms.com/fatty-liver-index-fli-of-bedogni-et-al-for-predicting-hepatic-steatosis.
Women were divided into three groups (FLI < 30, n = 80; 30 ≤ FLI < 60, n = 44; FLI ≥ 60, n = 26) [14].

Biochemical analyses

The blood samples were taken between 7 and 9 a.m., after at least 8 h of overnight fast. Samples were left to clot for 30 min and then centrifuged at 3000 rpm for 10 min. Serum samples were divided into aliquots and stored at –80C, without prior thawing and re-freezing before analyses, except for glucose, which was determined immediately after the blood was drawn. Serum levels of glucose, total cholesterol (TC), HDL-c, low-density lipoprotein cholesterol (LDL-c), triglycerides (TG), albumin, uric acid, aspartate aminotransferase (AST), alanine aminotransferase (ALT) and -glutamyl transferase (GGT) were measured using standardized enzymatic procedures, spectrophotometrically (Roche Cobas 400, Mannheim, Germany). Cystatin C, RBP4, and high-sensitivity C-reactive protein (hsCRP) levels were determined using a nephelometric assay (Behring Nephelometer Analyzer, Marburg, Germany). Sex-hormone binding globulin (SHBG), total estradiol, total testosterone and insulin were measured by chemiluminescent immunometric assay (Immulite 2000, Siemens, Munich, Germany). Homeostasis model assessment of insulin resistance (HOMA-IR) was calculated: HOMA-IR = fasting glucose (mmol/l) × fasting insulin [µIU/l]/22.5 [23]. Bioavailable testosterone was calculated, also (http://www.issam.ch/freetesto.htm) [24].

Statistical analysis

Statistical analysis was performed using the SPSS statistical package (version 15.0 for Windows, SPSS, Chicago, IL, USA). Data are presented as mean ± standard deviation, or median (interquartile range), or counts and percentages. Differences between groups were evaluated with Student’s t test for normally or the Mann-Whitney test for non-normally distributed parameters or one-way analysis of variance (ANOVA) and Kruskal-Wallis non-parametric analysis of variance, where appropriate. The 2 test was used to analyze the differences in categorical data. Pearson’s (r) correlation coefficient was used to determine the relationships between FLI and other variables. Due to skewed distribution, log transformed HOMA-IR and hsCRP were used. Multiple linear regression (MLR) analysis was performed to identify independent determinants of FLI. Receiver operating characteristic (ROC) curve analysis was used with the purpose of testing the discriminatory potential of a group of parameters selected in MLR analysis, with FLI as the dependent variable. Construction of a model consisting of FLI formula independent parameters by using logistic regression analysis was also performed. In all analyses a p-value of < 0.05 was considered as statistically significant.


Table I shows the general clinical and biochemical characteristics of apparently healthy postmenopausal women involved in this study. Significantly higher BMI and WC (p < 0.001, respectively), fasting glucose (p = 0.003), insulin and HOMA-IR (p < 0.001, respectively), LDL-c (p = 0.015), triglycerides, GGT and ALT activity, SBP, and DBP (p < 0.001, respectively), but lower HDL-c (p < 0.001), were observed in women with a higher FLI level as compared with the low FLI level group. Furthermore, we also found a significant difference in several other cardiometabolic parameters, which are independent of FLI calculation, i.e., a significantly higher level of uric acid, hsCRP, cystatin C (p < 0.001, respectively), and RBP4 (p = 0.001) among women in the higher FLI level group, as compared with women in the low FLI level group. Moreover, a significantly higher number of obese individuals (2 = 57.29; p < 0.001), as well as individuals with MetS (2 = 53.24; p < 0.001), was found in the group with the highest FLI. There was no difference with respect to age, TC level, AST activity, albumin, total estradiol or testosterone level between groups.
Next, we performed Pearson’s correlation in order to examine the potential relationship between FLI level and cardiometabolic parameters independent of FLI calculation (LDL-c, glucose, insulin, HOMA-IR, cystatin C, RBP4, hsCRP, uric acid, ALT, free and bioavailable testosterone, SHBG, SBP and DBP) in the whole group of apparently healthy postmenopausal women.
Pearson’s correlation revealed a significant positive relationship between FLI and LDL-c (p = 0.002), log HOMA-IR, cystatin C, RBP4, uric acid, bioavailable testosterone, SHBG, ALT activity and SBP (p < 0.001, respectively), as well as a significant negative relationship between FLI and HDL-c (p < 0.001) (Table II).
Multiple linear regression (MLR) analysis was performed to identify which of the measured markers have the best association with FLI. Namely, all variables found to have a significant predictive value in Pearson’s correlation (e.g., ALT, SBP, LDL-c, bioavailable testosterone, HOMA-IR, uric acid, hsCRP, cystatin C and RBP4) were further analyzed in MLR analysis for FLI prediction. Backward selection enabled us to find the best model consisting of 4 parameters (e.g., bioavailable testosterone ( = 0.288, p = 0.001), log HOMA-IR ( = 0.227, p = 0.005), log hsCRP ( = 0.322, p < 0.001), and RBP4 ( = 0.226, p < 0.001)]. Adjusted R2 for the best model was 0.550, which means that as much as 55.0% of variation in FLI could be explained with this model (Tables III and IV).
After that, we conducted a receiver operating characteristic (ROC) analysis of selected parameters to test their discriminatory ability regarding FLI level (low vs. higher level). Additionally, we constructed a model consisting of those 4 parameters (bioavailable testosterone, log HOMA-IR, log hsCRP and RBP4) by using logistic regression analysis generated predictive probabilities. Figure 1 shows the ROC curve graph and Table V shows the most important ROC parameters: area under the curve (AUC) with 95% confidence interval (CI) of selected parameters and the model. Table V also shows sensitivities, specificities and cut-off values for selected parameters.
Comparison of ROC curves showed that all separate curves have comparable discriminatory capability towards FLI level status. Construction of a model consisting of those 4 FLI formula independent parameters (bioavailable testosterone, log HOMA-IR, log hsCRP and RBP4) by using logistic regression analysis showed that the new ROC curve had outstanding discriminatory capability (AUC = 0.990, according to Hosmer and Lemeshow’s rules) [25].


To our knowledge, this is the first study to examine a cluster of biomarkers (e.g., adipokines, inflammation markers, insulin resistance markers and sex hormones) that can make a significant contribution to fatty liver assessment. We found several biomarkers that are independently associated with FLI, such as bioavailable testosterone, insulin resistance as measured by HOMA-IR, RBP4 and hsCRP, showing that as much as 55.0% of variation in FLI could be explained with this model. Furthermore, the current study has demonstrated that the multimarker approach could be of great benefit in order to identify those postmenopausal women with higher FLI. Namely, construction of a model consisting of those 4 FLI formula independent parameters (bioavailable testosterone, log HOMA-IR, log hsCRP and RBP4) by using logistic regression analysis showed that the new ROC curve had outstanding discriminatory capability, according to Hosmer and Lemeshow’s rules (Figure 1 B).
The NAFLD represents the hepatic manifestation of MetS [1]. In line with this, in our study we reported a significantly higher number of obese postmenopausal women, as well as women with MetS status, in the highest FLI group, as compared to the low FLI group. Moreover, all normal weight women were in the low FLI group, suggesting that obese state may greatly influence the hepatic steatosis state.
Visceral adipose tissue is a significant source of free fatty acids which reach the liver through the portal vein, thus having a great influence on fatty liver development [12]. In addition, IR and compensatory hyperinsulinemia also contribute to increased hepatic lipogenesis. The enlargement of visceral adipose tissue is also accompanied by chronic low-grade inflammation and monocyte infiltration, leading to dysregulation of secretion of pro-inflammatory cytokines (tumor necrosis factor- (TNF-), interleukin-6 (IL-6), CRP) [3, 26] and adipokines (e.g., increased levels of leptin and RBP4 and decreased levels of adiponectin) that modulate insulin sensitivity [12].
Inflammation plays a key role in the pathogenesis of NAFLD [3]. Bhatia et al. [27] demonstrated that an increase in CRP was an independent risk factor for NAFLD, which is in line with our results.
Even though RBP4 originates from the liver and is closely related to adiposity, IR and liver fat [28], no clear link has been established between RBP4 and NAFLD severity [29, 30].
The current study demonstrated an independent association between RBP4 and FLI, which is also consistent with the results in a pediatric population [31].
Although we did not report any difference in total estradiol and total testosterone level between groups, we observed higher free and bioavailable testosterone in the high FLI group. Our results were similar to the results obtained by Polyzos et al. [32], who also reported no difference in serum total estradiol and testosterone level between women with NAFLD and the control group, but reported higher free and bioavailable testosterone levels in postmenopausal women with NAFLD. All these data demonstrated that androgen excess, which is the main feature of PCOS and postmenopause, and is interrelated to IR, may be an additional contributing factor to NAFLD development [12].
Previous studies have examined the correlation between hyperandrogenemia and NAFLD and showed either no relationship [17, 18] or an independent association between testosterone level and NAFLD [19, 20].
Macut et al. [17] reported no independent correlation between free androgen index and NAFLD in PCOS women, suggesting that the association between elevated androgen levels and NAFLD is mediated by IR. They speculated that IR aggravates hyperandrogenemia by increasing ovarian androgen synthesis and by down-regulating hepatic SHBG production, establishing a positive feedback loop between increased circulating levels of free androgens and more pronounced IR in patients with PCOS.
In concordance with Macut et al. [17], IR evaluated with the HOMA-IR was independently associated with NAFLD in our population. IR is associated with impaired suppression of lipolysis in the adipose tissue, leading to an increased influx of free fatty acids to the liver and consequent hepatic steatosis [33].
However, in our study in MLR, bioavailable testosterone was independently associated with FLI, suggesting that androgen excess in postmenopausal women could be an additional fatty liver risk factor, independently of IR.
In a population of men with NAFLD, lower total and free testosterone levels were independently associated with NAFLD [34], thus confirming the paradox in understanding the relationship of circulating androgen levels with metabolic disorders and NAFLD. Namely, low total and free testosterone are also associated with MetS and DM2 in men, whereas high total and free androgens are associated with MetS and IR in women with PCOS [35]. Similarly, increased free testosterone was related to higher risk of MetS and is strongly related to abdominal obesity in postmenopausal women [36].
Bioavailable testosterone may play an important role in menopause-related redistribution of fat towards the central abdominal region. Janssen et al. [37] demonstrated that women with more rapidly changing bioavailable testosterone experienced a larger increase in adiposity compared with their more stable counterparts, suggesting that the relationship between increased bioavailable testosterone and adipose tissue may be key in the understanding of hormonal changes observed during the menopausal transition that links obesity to fatty liver risk.
Our study has some limitations. The small number of postmenopausal women included in the current cross-sectional study may affect the results. Furthermore, the causal relationship between FLI and bioavailable testosterone in postmenopausal women could not be established. Furthermore, we excluded the potential influence of medications on the obtained results, since we included only those women who did not receive any medications in the last 6 months. However, it could be interesting in some future studies to examine the influence of medications on the results obtained in the current study.
In conclusion, bioavailable testosterone is independently associated with the FLI in postmenopausal women. Prospective studies are needed for a better understanding of the mechanisms of the relationship between increased androgenicity in postmenopausal women and non-alcoholic fatty liver disease in order to find better targeted therapy for decreased risk and consequences of fatty liver status in this population group.


This work was financially supported in part by a grant from the Ministry of Education, Science and Technological Development, Republic of Serbia (Project number OI 175035).

Conflict of interest

The authors declare no conflict of interest.


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