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New association of bone morphogenetic protein 4 concentrations with fat distribution in obesity and Exenatide intervention on it



Bone morphogenetic protein 4 (BMP-4) has been proven to regulate white adipogensis. We aimed to demonstrate the correlation of BMP-4 with fat distribution and Exenatide treatment on it.


We enrolled 69 obese patients. Anthropometric and metabolic indexes were collected. Fat distribution was measured by dual-energy X-ray absorptiometry. BPM-4 levels were assessed using enzyme-link immunosorbent assay kit. 30 obese patients were treated with Exenatide twice a day. Change in body weight, metabolic-related indices and BPM-4 levels were evaluated after 18 weeks.


1) The mean(±SD) BMP-4 levels were 763.98 ± 324.11 pg/ml in the obese. BPM-4 levels were significantly positively correlated with estimated visceral adipose tissue mass in all subjects and also in females (r = 0.377, r = 0.625, respectively,all P < 0.05). BPM-4 levels were also significantly positively correlated with body mass index, hip circumference and total fat% in females (r = 0.375,r = 0.429,r = 0.493,respectively, all P < 0.05). BPM-4 levels were negatively correlated with total cholesterol(TC) in all subjects and males also (r = −0.373,r = −0.332,respectively, all P < 0.05). BPM-4 levels were also significantly positively correlated with free triiodothyronine in males (r = 0.441, P < 0.05). 3) Multivariate analyses showed that TC was risk factor of BMP-4 concentration in males and Est.VAT Area was risk factor of BMP-4 levels in females. 4) BMP-4 levels were significantly higher in the obesity with slightly increased thyroid stimulating hormone(TSH) than the obesity without slightly increased TSH (902.08 ± 354.74 pg/ml vs. 720.24 ± 306.41 pg/ml, P < 0.05). 5) Exenatide treatment leads to a significant decreased in BMP-4 from 860.05 ± 352.65 pg/ml to 649.44 + 277.49 pg/ml independent of weight loss(P < 0.05).


BMP-4 levels were associated with the visceral adipose tissue and may play a certain role in fat distribution and subclinical hypothyroidism in obesity. Exenatide treatment reduced BMP-4 levels independent of weight loss.

Trial registration Identifier: NCT02118376, Registered 16 April.


Obesity is a worldwide health problem with increasing prevalencecharacterized by increase in adipocytes [1]. Obese patients are prone to developing insulin resistance and type-2 diabetes (T2DM). The increasing number and size of mature adipocytes results in obesity [2]. Adipose tissue is classified as white adipose tissue (WAT) and brown adipose tissue (BAT). The increased adipocyte plays a major role in the related complications in obese patients as WAT is primary site of triglyceride storage [3]. Fat accumulates in different ectopic sites, including visceral adipose tissue, which is responsible for the obesity related metabolic consequence [4]. However, excess fat stored in the subcutaneous has a protective effect against these complications [5].

The bone morphogenetic proteins (BMPs) have been shown to recruit adipose precursor cells into the adipose lineage [6]. Bone morphogenetic protein 4(BMP-4) is a growth factor of the transforming growth factor-β superfamily that is related to white adipogenesis [7, 8]. Recent data has certified that BMP-4 plays a role in obesity as BMP-4 is an integral feedback regulator of both white and beige adipogenic commitment and differentiation [9]. BMP-4 signaling is involved in the common pathophysiology of obesity and abnormal glucose metabolism [10]. Son et al. [11] found that serum BMP-4 levels in non-diabetic patients with obesity and metabolic syndrome were significantly increased. Glucagon-like peptide-1 (GLP-1) receptor agonist has been shown to be effective in decreasing body weight and improving fat distribution. The mechanism of its action is activation of GLP-1R in the hypothalamus dephosphorylates adenosine monophosphate-activated protein kinase(AMPK) and stimulates BAT thermogenesis and energy expenditure [12].

However, the association of BMP-4 levels with metabolic parameters and fat distribution, and the interaction of GLP-1 and BMP-4 has not been completely expounded. Therefore, in this study, we aimed to investigate the association of serum BMP-4 levels with fat distribution and the effect of GLP-1 receptor agonist(Exenatide) treatment on it in obese patients.


Patients and exenatide intervention trial

Sixty-nine obese Chinese patients from the outpatient of the Endocrinology and Metabolism department at the Shanghai Tenth People’s Hospital, who all provided informed consent, were included in this study (aged from 18 to 68 years old). Obesity was defined by the criteria that the body mass index (BMI) was over 28 kg/m2. The exclusion criteria were as follows: 1) clinical or laboratory evidence of impaired cardiac, liver and renal function. 2) severe systemic diseases (e.g., cancer and heart failure), and 3) taking medications known to affect body weight. 4) a history of severe gastrointestinal diseases. Among them, a total of 30 obese patients were recruited for Exenatide treatment. They received 5 mg exenatide twice a day for the first 4 weeks, which was then increased to 10 mg twice a day for the remaining 14 weeks. Before and after the 18-week treatment, their metabolic parameters were tested. This study was approved by the ethics committee of Shanghai Tenth People’s Hospital. The Clinical Trials registration Number is NCT02118376.


Weight was measured with light clothes and without shoes in all subjects. BMI was calculated as weight (kg)/(height2) (m2). Neck circumference (NC) was measured horizontally at the upper margin of laryngeal prominence with head erect and eyes facing forward. Waist circumference (WC) was measured at the point midway between the lower rib margin and the superior iliac crest along the mid-axillary line using a measuring tape. Hip circumference (HC) was measured at the maximum point around the buttocks. The waist to hip ratio (WHR) was calculated as the WC divided by HC. After the subjects rested for 10 min, blood pressure (BP) (systolic pressure (SP) and diastolic pressure (DP)) was measured while they were seated. BP was measured twice and the average value was used for analysis.

Biochemistry and fat content

Blood samples were collected after all subjects were fasted for 12 h. These biochemical parameters included alanine transaminase (ALT), aspartate aminotransferase(AST), fasting plasma glucose (FPG), fasting insulin (FINS), C-peptide, glycated hemoglobin A1C (HbA1C), total cholesterol (TC), triglyceride (TG), high density lipoprotein cholesterol (HDL-C), low density lipoprotein cholesterol (LDL-C), C reactive protein (CRP), free fatty acids (FFA), uric acid (UA), free triiodothyronine(FT3), free thyroxine (FT4) and thyroid stimulating hormone(TSH). Insulin resistance was assessed using Homoeostasis Model of Insulin Resistance(HOMA-IR) calculated by fasting plasma glucose (mmol/L) × fasting plasma insulin (uU/mL)/22.5 [13]. Body fat mass of different body parts were measured with high accuracy by dual-energy X-ray absorptiometry (DEXA) (Hologic QDR4500, USA). We selected the data from DEXA including %fat trunk/%fat legs, total fat mass, trunkfat%, estimated visceral adipose tissue Area (Est. VAT Area), total fat%, trunk fat mass, trunk/limb fat mass ratio.

BMP-4 measurement

Blood samples were collected after all subjects were fasted for 12 h. Serum BMP-4 levels were measured using a Quantikine human BMP-4 ELISA Kit (abcam, Catalog Number ab99982, Cambridge, MA, USA). The detection limits of assay were between 24.69 pg/ml and 6000 pg/ml.

Definition of metabolic syndrome, hyperuricemia and subclinical hypothyroidism.

The metabolic syndrome (MetS) was defined by three out of the following five components: WC ≥ 94 cm in males and ≥80 cm in females, hypertriglyceridemia (≥1.7 mmol/l), low HDL-C (< 1.0 mmol/l in males or <1.3 mmol/l in females), increased BP (SP ≥ 130 mmHg and/or DP ≥ 85 mmHg and/) or positive history of hypertension or on any hypertensive treatment, FPG ≥ 5.6 mmol/l or on any hypoglycemic drugs [14]. Hyperuricemia was defined as serum UA ≥ 7 mg/dl (≥417 umol/L) in males, and ≥ 6 mg/dl (≥357 umol/L) in females [15]. Mild increased TSH was defined in this study as a TSH level ranged from 2.5 to 5.5 mU/l and a normal free-thyroxine level [16, 17].

Statistical analysis

All data were performed using SPSS 17.0 software. All continuous values were presented as means ± standard deviation(\( \overline{X} \)±s) and the count data were expressed as the number of columns (n). Quantitative data were analyzed using a t-test between two groups. The correlation between BMP-4 and other variables were assessed using Pearson’s correlation analysis. Multivariate regression analysis was performed to determine independent contributing factors for BMP-4 levels. Non-normally distributed variables were logarithmically transformed before analysis. Statistical differences were two tailed with P value less than 0.05.


Demographic and biochemical parameters

Table 1 shows clinical characteristics and biochemical data for the 69 obese subjects with BMI being 33.64 ± 5.17 kg/m2. Serum BPM-4 levels were 763.98 ± 324.11 pg/ml in all obese patients, and 727.83 ± 316.48 pg/ml in males and 813.85 ± 333.41 pg/ml in females respectively without significant difference. The NC, WHR, UA, FT3, FT4, %fat trunk/%fat legs were significantly higher in males than females (all P < 0.05). However, the HOMA-IR, HDL-C, FFA, TSH, trunk fat%, Est. VAT Area, total fat% and trunk fat mass were significantly higher in females than males (all P < 0.05). There were no statistical differences of other parameters between males and females.

Table 1 Clinical and biochemical characteristics of the obese patients

Correlation of BMP-4 with anthropological and metabolic variables

The BMP-4 levels were 763.98 ± 324.11 pg/ml in all obese patients, and 727.83 ± 316.48 pg/ml in males and 813.85 ± 333.41 pg/ml in females respectively. In all subjects, BMP-4 levels were significantly positively associated with Est. VAT Area as presented in Table 2(all P < 0.05). Correlation of BMP-4 with fat distribution showed that BMP-4 levels were also significantly positively associated with Est. VAT Area and total fat% in females as shown in Table 2(all P < 0.05). Additionally, BMP-4 was also significantly negatively correlated with TC in all subjects and males (all P < 0.05). BMP-4 was also significantly positively associated with FT3 in males (P < 0.05). In Table 3, the multiple linear regression analysis results showed that Est. VAT Area was independently related to BMP-4 when other potential confounding variables were included in the female group. However, in all subjects and males, TC was the influencing factor of serum BMP-4 concentration.

Table 2 Correlations of serum BMP-4 levels with anthropometric variables, glucose-lipid metabolism and fat content
Table 3 Multivariate analysis for risk factors of BMP-4

Difference of BMP-4 levels between obesity related diseases

In these obese subjects, the prevalence of Mets, hyperuricemia and slightly increased TSH accounted for 62.31%, 52.17% and 26.08% respectively. BMP-4 levels were significantly higher in obesity with slight increase in TSH than obesity without slight increase in TSH (902.08 ± 354.74 pg/ml vs. 720.24 ± 306.41 pg/ml, P < 0.05) as presented in Fig. 1. Meanwhile, BMP-4 levels were slight higher in those with both Mets and hyperuricemia when compared to those without the corresponding complications (773.39 ± 325.79 pg/ml vs. 767.36 ± 347.20 pg/ml; 831.26 ± 340.72 pg/ml vs. 712.23 ± 309.99 pg/ml, all P > 0.05) as shown in Figs. 2 and 3.

Fig. 1
figure 1

BMP-4 levels in obesity with mild increased TSH and without mild increased TSH

Fig. 2
figure 2

BMP-4 levels in obesity with Mets and without Mets

Fig. 3
figure 3

BMP-4 levels in obesity with hyperuricemia and without hyperuricemia

Change in BMP-4 and other parameters of Exenatide treatment

After 18 weeks of Exenatide treatment, the BMP-4 levels in 30 obese patients were significantly decreased from 860.05 ± 352.65 pg/ml to 649.44 + 277.49 pg/ml(P = 0.01), shown in Fig. 4. The body weight and BMI were also significantly decreased from 94.86 ± 15.70 to 93.25 ± 16.37 kg(P = 0.024) and 33.52 ± 5.03 to 32.88 ± 5.42 kg/m2(P = 0.01). However, the change of BMP-4 was not significantly associated with the change in body weight and BMI (P > 0.05). Additionally, following Exenatide intervention, the glucose metabolism was significantly improved, shown in Table 4.

Fig. 4
figure 4

Change of BMP-4 levels after Exenatide treatment

Table 4 Change of glucose metabolism after Exenatide intervention


Obesity is a worldwide health problem which need intervention and the patient may be the most important member of the health management [18]. Excess fat deposition is the manifestation of obesity. The ability of storing excess energy in adipose tissue is an evolutionary adaptation. However, the excessive fat mass accumulation gives rise to insulin resistance and inflammatory response [19]. Affected patients are often insulin resistant and dyslipidemic. It is also a high risk factor for metabolic syndrome. BMPs are members of the transforming growth factor β superfamily [20]. BMP-4 secreted by white adipose cells has been implicated in regulating adipogenic precursor cell commitment and differentiation. Differentiated human adipose cells can promote adipogenesis via endogenous BMP-4 activation [6]. BMP-4 antagonist inhibits the differentiation of pre-adipocytes into adipocytes [21]. BMP-4 also has an important role in promoting brown adipocyte differentiation and thermogenesis in vivo [22]. BMP-4 alters insulin sensitively by changing white adipose tissue [23]. A study also found that BMP-4 levels are significantly higher in obesity patients with metabolic syndrome [11]. However, little study has investigated the association of BMP-4 levels with fat distribution in obesity. Additionally, the relationship between GLP-1 treatment and BMP-4 levels were unclear. The aim of the current study was to investigate the serum BMP-4 levels in relation to fat distribution in obese patients and to examine changes brought about by Exenatide treatment. This study suggested that serum BPM-4 levels were significantly positively correlated with Est. VAT Area and negatively correlated with TC in all subject. Serum BPM-4 levels were significantly positively correlated with FT3 and negatively correlated with TC in males. The serum BMP-4 levels were significantly positively correlated with BMI, Est. VAT Area and total fat% in females. Among these parameters, TC was the influencing factor of serum BMP-4 concentration in all subjects and males, and Est. VAT area was the independent contributory factor to serum BMP-4 concentration in female. After 18 weeks Exenatide treatment, the BMP-4 levels were significantly decreased.

Animal study has suggested that BMP-4 mRNA expression was increased in inguinal fat of ob/ob mice when compared to control lean mice [1]. Serum BMP-4 levels were positively associated with BMI in human [11]. Our study suggested that the serum BMP-4 levels were also significantly positively correlated with BMI in females with obesity.

The adipose tissue of obesity is the foundation of metabolic disease [24]. Fat deposition in different part of the body has different degree of metabolic risk although the same amount of total fat mass may be unchanged [25]. Nonalcoholic fatty liver(NAFLD) caused by abnormal hepatic fat deposition is due to more than just impaired adenosine-monophosphate-activated protein kinase (AMPK)-peroxisome proliferator-activated receptor alpha(PPAR-α) signaling [26]. The ectopic fat accumulation also has a range of metabolic and cardiovascular effects. Central obesity is high risk factor of T2DM [2729]. WHR and WC are the indicators of central obesity [30]. Study has found that serum BMP-4 levels were positively associated with WC and WHR [11]. As excess abdominal visceral fat is strongly associated with abnormal metabolic profile, we further researched the association of BMP-4 levels with fat content and its distribution. The results showed that the BMP-4 levels were significantly positively related to the trunk fat mass, especially visceral adipose tissue in the current study in total subjects and females. BMP-4 levels were also significantly positively related to total fat% and HC in female and negatively related to WHR in females. However, the association in males was not significant. This may due to the WHR and NC were significantly higher in males than females while the visceral adipose tissue was significantly higher in females than males. Multivariate analyses also reminded that the Est. VAT area was the risk factor for serum BMP-4 concentration in females. Therefore, we infer that visceral adipose tissue may play an important role in BMP-4 levels in females.

On the relationship between BMP-4 and glucose-lipid metabolic disorders in obese patients, a previous study has shown that serum BMP-4 levels were positively correlated with fasting plasma insulin, homeostasis model assessment index, and triglycerides and negatively correlated with HDL-C in obese individuals [11]. However, in this study, BMP-4 levels were negatively associated with TC levels in all subjects, especially in male. Visceral fat accumulation results in the obesity-associated dyslipidemia [31]. However, TC is significantly associated with the ectopic visceral fat and subcutaneous fat in women not man [32]. Therefore, the association between BMP-4 and TC levels in males may be due to the visceral fat accumulation, which is slightly less in males than females in our study. Previous study has showed that serum BMP-4 levels are significantly positively associated with adiposity, insulin resistance [11]. However, other study showed that BMP-4 expression is up-regulated in human adipocytes to play a protective anti-inflammatory effect [33]. BMP-4 acts as an anti-inflammatory molecule via increasing proliferator-activated receptor γ (PPARγ) expression and reducing pro-inflammatory cytokines tumor necrosis factor α (TNF-α) in human adipocytes [33]. BMP-4 may be a protective factor in males. There need more studies to prove and explain it.

Previous study has shown that subclinical hypothyroidism(SH), characterized by mildly increased TSH, is a secondary phenomenon of the abnormal fat accumulation and redistributions, and not a real hypothyroid state in obesity [34]. Studies also indicate that obesity is a risk factor for hyperuricemia and hyperuricemia may be affected by body fat distribution [35, 36]. Obesity is one of the components of metabolic syndrome and previous study has shown that serum BMP-4 levels were significantly increased in individuals with obesity or metabolic syndrome [11]. Therefore, in the current study, we compared the BMP-4 levels in obesity associated with different types of metabolic disorder to obesity without the corresponding complications. The results showed that BMP-4 levels were significantly higher in obesity with slight increased TSH than without increased TSH. Central obesity is associated with SH, especially the visceral fat deposition is related to increased TSH [37, 38]. Therefore, it may be the increased TSH with more serious visceral fat deposition that caused the higher BMP-4 levels in this study. Besides, BMP-4 levels were slightly higher in obesity with Mets or hyperuricemia. However, the difference has no statistical significance. It may be due to the limit sample.

GLP-1 receptor agonist is useful in treating diabetes. It is also efficient in decreasing weight loss in the obesity by restraining appetite. Exenatide is a GLP-1 receptor agonist that has been used in clinic. In our study, 18 weeks Exenatide treatment led to a significant decrease in BMP-4 levels, independent of weight loss. Therefore, we infer that there may exist interaction between GLP-1 and BMP-4. We deduce the metabolic improvement by weight loss and fat distribution treated by exenatide may lead to the decreased BMP-4 levels. We will design the animal experiment to elucidate the underlying mechanism.

There also exist limitations in this study. Primarily, our study was limited because of the relatively small number of patients. Secondly, our results might not be universal because subjects enrolled were only Chinses, therefore, it may not be applied to other races. Finally, it is a mechanism which has yet to be fully elucidated. Therefore, more studies with larger sample are required to confirm the results. More basic studies are warranted to expound the signaling mechanisms linking BMP4 with fat distribution.


In summary, this was the first study that demonstrated that serum BMP-4 levels were associated with visceral fat content in obese patients. The role of BMP-4 in males and females may be different. Visceral adipose mass may predict the serum BMP-4 levels in females with obesity. BMP-4 were significantly decreased after Exenatide treatment in obesity. Therefore, further studies are required to investigate the relationship between serum BMP4 levels and the pathogenesis of obesity.



Alanine transaminase


Monophosphate-activated protein kinase


Aspartate aminotransferase


Brown adipose tissue


Bone morphogenetic protein 4


Blood pressure




C reactive protein


Dual-energy X-ray absorptiometry


Diastolic pressure

Est. VAT Area:

Estimated visceral adipose tissue Area


Free fatty acids


Fasting insulin


Fasting plasma glucose


Free triiodothyronine


Free thyroxine


Glucagon-like peptide-1


Hemoglobin A1C


Hip circumference


High density lipoprotein cholesterol


Homoeostasis Model of Insulin Resistance


Low density lipoprotein cholesterol


Metabolic syndrome


Neck circumference


Proliferator-activated receptor γ


Subclinical hypothyroidism


Systolic pressure


Type-2 diabetes


Total cholesterol




Tumor necrosis factor α


Thyroid stimulating hormone


Uric acid


White adipose tissue


Waist circumference


Waist to hip ratio


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This article was support by the National Natural Science Foundation of China (NSFC) (grant numbers 81,570,782).

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The datasets during and/or analysed during the current study are available from the corresponding author on reasonable request.

Authors’ contributions

SQ designed the study. XW performed the experiment and drafted the manuscript. JC and LL participated in the data collection and statistical analysis. CZ assisted the manuscript revision. JG took part in language editing. Sharvan Rampersad helped to amend the language corrections. LB revised the manuscript and prepared manuscript. All authors read and approved the final manuscript.

Competing interests

The authors declare that they have no competing interests.

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Not applicable.

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This study was approved by the ethics committee of Shanghai Tenth People’s Hospital.

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Correspondence to Shen Qu.

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Wang, X., Chen, J., Li, L. et al. New association of bone morphogenetic protein 4 concentrations with fat distribution in obesity and Exenatide intervention on it. Lipids Health Dis 16, 70 (2017).

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