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Saudi Journal of Kidney Diseases and Transplantation
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ORIGINAL ARTICLE  
Year : 2012  |  Volume : 23  |  Issue : 4  |  Page : 736-742
Association of adiponectin with cardiovascular events in diabetic and non-diabetic hemodialysis patients


Department of Internal Medicine and Clinical Pathology, Faculty of Medicine, Zagazig University, Zagazig, Egypt

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Date of Web Publication9-Jul-2012
 

   Abstract 

Adiponectin is a novel collagen-like protein synthesized by white adipose tissue. Its levels are decreased in obesity, type-2 diabetes and insulin-resistant states, and are increased in chronic renal failure. It has anti-inflammatory and anti-atherogenic properties. This study was planned to evaluate the levels of adiponectin in uremic patients with and without diabetes and to find any relationship between adiponectin levels and some cardiovascular risk factors, and to determine the possible predictive value of adiponectin for cardiovascular complications (CVC). The study included 100 subjects, 20 of them were healthy subjects and served as the control group (group I), 40 were uremic non-diabetic patients (group II) (half of them were without CVC, group IIA, and the other half were patients with CVC, group IIB) and, lastly, 40 uremic diabetic patients (group III) (half of them were without CVC, group IIIA, and the other half were patients with CVC, group IIIB). All subjects were subjected to complete clinical examination, including determination of mean arterial blood pressure (MABP), body mass index (BMI), waist to hip ratio, routine laboratory investigations, fasting plasma glucose, fasting plasma insulin, lipid profile (cholesterol, TG, LDL, HDL), determination of insulin resistance by homeostasis model assessment index (HOMA-IR) and estimation of serum levels of adiponectin. There was a significant increase in serum adiponectin levels in all the uremic patients (group II and group III) when compared with the control (group I) group, P <0.01; also, serum adiponectin levels were significantly decreased in uremic diabetic patients (group III) when compared with uremic non-diabetic patients (group II), P <0.01; but this was still higher than in the controls. The patients with CVC, whether uremic non-diabetic (group IIB) or uremic diabetic (group IIIB), had a significant decrease in serum adiponectin levels when compared with patients without CVC (group IIA and group IIIA), P <0.01. Serum adiponectin has a significant positive correlation with HDL and a significant negative correlation with MABP, BMI, plasma insulin, HOMA-IR, LDL, TG and choles­terol in all the patients. Therefore, it can be concluded that adiponectin levels in uremic patients, whether diabetic or non-diabetic, may be a good indicator of cardiovascular disease risk.

How to cite this article:
Elokely A, Shoukry A, Ghonemy TA, Atia M, Amr G. Association of adiponectin with cardiovascular events in diabetic and non-diabetic hemodialysis patients. Saudi J Kidney Dis Transpl 2012;23:736-42

How to cite this URL:
Elokely A, Shoukry A, Ghonemy TA, Atia M, Amr G. Association of adiponectin with cardiovascular events in diabetic and non-diabetic hemodialysis patients. Saudi J Kidney Dis Transpl [serial online] 2012 [cited 2019 Dec 8];23:736-42. Available from: http://www.sjkdt.org/text.asp?2012/23/4/736/98151

   Introduction Top


Atherosclerotic complications are the leading cause of high cardiovascular mortality rates among patients with end-stage renal disease (ESRD); [1] classic risk factors partly explain the high cardiovascular risk in these patients. [2]

Adiponectin, which is a novel collagen-like protein synthesized by white adipose tissue that circulates at relatively high (2-20 μg/mL) serum concentrations, [3] has gained attention for its role in glucose and lipid metabolism. There is a strong positive relationship between adiponectin and insulin sensitivity. [4]

Adiponectin is reported to be abundant in human blood, with its plasma levels accounting for 0.01% of the total plasma. [5] Plasma adiponectin is decreased in obesity, suggesting that the dysregulation of adiponectin may be rele­vant to obesity-linked disorders. [6] It is also reduced in type-2 diabetes, insulin-resistant states, coronary artery disease and dyslipidemia. [7],[8] Apart from the anti-diabetic effect, adiponectin has anti-atherogenic properties. [9] In fact, adiponectin has been shown to suppress all processes involved in atherosclerotic vascu­lar changes, including the expression of adhe­sion molecules in vascular endothelial cells and proliferation of vascular smooth muscle cells. [10] Adiponectin plays an important role in inhi­bition of the inflammatory response, perhaps because it suppresses the attachment of monocytes to endothelial cells. [9]

Plasma adiponectin levels are dependent on glomerular filtration rate, being markedly in­creased among patients with renal impairment, [2] and also in patients on maintenance hemodialysis, peritoneal dialysis and ESRD. [11] Most of the interest in adiponectin depends on its potential protective role for the cardiovascular system. [12] Hyperinsulinemia, which is a well known metabolic complication of chronic re­nal failure, might downregulate plasma adiponectin levels among dialysis patients. [13]

Low levels of adiponectin are associated with adverse metabolic states such as diabetes, [14] metabolic syndrome, [15] dyslipidemia, [16] lipodystrophy and atherosclerotic cardiovascular disease. [17]

We aimed, in this study, to evaluate the le­vels of adiponectin in uremic patients with and without diabetes and to find any relationship between adiponectin levels and some cardio­vascular risk factors, and to determine the pos­sible predictive value of adiponectin for car­diovascular complications (CVC).


   Subjects and Methods Top


This study was carried out in the Internal Medicine and Clinical Pathology Departments, Faculty of Medicine, Zagazig University.

The study was conducted on 100 subjects classified into three groups:

  1. Group 1 (control group): This group com­prised 20 apparently healthy volunteers.
  2. Group II: comprised 40 patients with ESRD on regular hemodialysis without diabetes. This group was further divided into two subgroups:
    1. Group IIA: Comprised 20 patients without CVC.
    2. Group IIB: Comprised 20 patients with CVC (seven with myocardial infarction [MI], ten with angina and three with stroke).
  3. Group III: Comprised 40 patients with ESRD on regular hemodialysis with dia­ betes. This group was further divided into two subgroups:
    1. Group IIIA: Comprised 20 patients without CVC.
    2. Group IIIB: Comprised 20 patients with CVC (six with MI, ten with angina and four with stroke).


All the patients including the control subjects were submitted to full clinical assessment including medical history and detailed clinical examination including blood pressure mea­surement, assessment of mean arterial blood pressure (MABP) (1/3 systolic arterial pressure) + 2/3 diastolic arterial pressure) and assess­ment of body mass index (BMI) and waist to hip ratio (WHR).

The laboratory investigations included fas­ting and 2 hours post-prandial blood glucose, complete blood count (by sysmex SF 3000), blood urea and serum creatinine, liver function tests and lipid profile, including total choles­terol, serum triglycerides (TG), high-density lipoprotein-cholesterol (HDL-C) and low-den­sity lipoprotein-cholesterol (LDL-C). Lipid profile, serum urea, creatinine, glucose and liver function tests were performed by Advia® chemistry and using the Advia® 1650 chemistry system (Siemens, Los Angeles, CA, USA).

Fasting plasma insulin was estimated by Immulite kits (Siemens, USA), which is a solid phase chemiluminescent immunoassay, using Immulite 1000 autoanalyzer (Siemens,, USA).

We determined the insulin resistance by homeostasis model assessment (HOMA) index, which was calculated by the following formula:

HOMA-IR index = fasting insulin (μU/mL) × fasting plasma glucose (mmol/L) / 22.5

Subjects were categorized as insulin resistant if their HOMA was greater than 1.64.

Estimation of serum levels of adiponectin was performed using the Human Adiponectin Elisa Kit (Linco Research, St. Charles, MO, USA). The assay was a Sandwich ELISA tech­nique based, sequentially, on concurrent capture of human adiponectin molecules from samples to the wells of a microtiter plate, which was coated with monoclonal anti-human adiponectin antibodies, and binding of a second biotinylated monoclonal anti-human antibody to the captured molecules. The unbound materials from samples were washed, followed by bin­ding of streptavidin-horseradish peroxidase conjugate to the immobilized biotinylated anti­bodies. Excess free enzyme conjugates were washed and quantification of immobilized anti­body enzyme conjugates was estimated by monitoring horse-radish peroxidase activities in the presence of the substrate 3,3', 5, 5'-tetra-methylbenzidine.

ELISA assay was performed using a Behring Elisa processor Π instrument. The lowest level of adiponectin that can be detected by this assay is 0.78 ng/mL-urinalysis.

Other investigations included resting ECG, pelvi-abdominal ultrasound (US) and echocardiography to detect left ventricle hypertorphy (LVH).

Anthropometric measures include body mass index (BMI) = weight (kg) / height (m 2 ) and waist to hip circumference ratio (WHR) = waist circumference (cm) / hip circumference (cm).


   Statistical Analysis Top


Data are presented as means ± SD. Compa­risons between groups were performed by ana­lysis of variance (ANOVA). When comparing two groups, the independent "t" test was per­formed. All data were coded, checked, entered and analyzed using Epi-Info version I for the year 2000, software computer package. [31]


   Results Top


There was a statistically highly significant difference between the mean values ± SD of BMI, WHR, MABP, cholesterol, triglycerids HDL, LDL, glucose, insulin, HOMA-IR and creatinine among the different groups of the study (P <0.01) [Table 1].
Table 1: Comparisons between mean values ± SD of some studied parameters in different groups of the study.

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Both patients with ESRD on regular hemodialysis without diabetes (group II) and pa­tients with ESRD on regular hemodialysis with diabetes (group III) had a statistically highly significant increase in the mean values ± SD of adiponectin, BMI, WHR, cholesterol, triglycerides and LDL, as well as a statistically significant decrease in the mean value ± SD of HDL as compared with the control group (group I) (P < 0.01) [Table 1].

There was a statistically significant increase in the mean values ± SD of cholesterol, TG and LDL and a decrease in the mean values ± SD of adiponectin and HDL in group III when compared with group II (P <0.01). However, there was no significant difference between group II and group III with regard to BMI and WHR. Moreover, there was a statistically significant increase in the mean values ± SD of glucose, insulin and HOMA-IR in group III when compared with group I and also when compared with group II, while no significant difference was found between group I and group II of the previous parameters [Table 1].

In group II (non-diabetic), serum adiponectin levels had a highly significant positive corre­lation with HDL (P <0.01) and a significantly negative correlation with each of MABP, tri­glyceride and LDL (P <0.05), while it was not significantly correlated with BMI, WHR, cho­lesterol, glucose, insulin, HOMA-IR and creatinine (P >0.05) [Table 2].
Table 2: Correlation between adiponectin and some studied parameters in different subgroups of the study.

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In group III (diabetic), serum adiponectin had a statistically significant positive correlation with each of WHR (P <0.01) and HDL (P <0.05), while it had a statistically significant negative correlation with MABP and trigly­cerides (P <0.05) [Table 2].

In group I (control group), serum adiponectin levels had a significant negative correlation with insulin (P <0.05), while it did not signi­ficantly correlate with other parameters [Table 2]. Furthermore, there was a significant posi­tive correlation between serum adiponectin levels and HDL and glucose levels (in each of group IIA, IIB and IIIA), while they correlated with HDL levels only in group IIIB. In addition, there was a significant negative correlation bet­ween serum adiponectin levels and age, BMI, MABP, cholesterol, triglyceride, insulin and HOMA-IR (in group IIA, IIB, IIIA and IIIB), LDL (in group IIA, IIB and IIIB only) and WHR in group IIIA only [Table 2].

Adiponectin levels in the non-diabetic pa­tients were highly significantly increased in those without CVC as compared with those with CVC (14.9 ± 4.5 and 11.3 ± 2.9, respec­tively, P <0.01).

The adiponectin levels were also highly sig­nificantly increased in diabetic patients with­out CVC as compared with those with CVC (12.9 ± 4.0 and 9.0 ± 2.5, respectively, P <0.01).

Adiponectin levels were highly significantly increased in non-diabetic patients without CVC when compared with diabetics without CVC (14.9 ± 4.5 and 12.9 ± 4.0, respectively, P <0.01). In addition, the adiponectin levels were highly significantly increased in non-diabetics with CVC in comparison with diabetics with CVC (11.3 ± 2.9, 9.0 ± 2.5, respectively, P <0.01).


   Discussion Top


Our study revealed a significant increase in adiponectin levels in both uremic non-diabetic and diabetic patients as compared with control subjects. These results were consistent with those found by Zoccali et al, [18] who revealed that adiponectin levels were markedly in­creased among patients with ESRD. The in­crease in adiponectin levels in our uremic pa­tients may be due to reduced adiponectin clearance by the kidney. [2]

The second important revealed result in our study was a significant decrease in serum adiponectin levels in uremic diabetic patients as compared with uremic non-diabetic patients, but still higher than controls even when stra­tified to those with and without CVC. This means that the presence of diabetes is asso­ciated with decreased levels of adiponectin irrespective of the absence or presence of uremia or CVC. These results were supported by those obtained by both Yang et al, [19] and Steffes et al, [4] who found decreased adiponectin levels in insulin-resistant and diabetic non-uremic patients. The explanation of reduced levels of adiponectin in diabetic patients may be due to an inhibitory effect of adiponectin on tumor-necrosis factor (TNF-α B) pathway, which contributes to insulin resistance. [5]

Our study revealed a significant negative cor­relation between adiponectin and each of HOMA-IR and insulin in all patients (groups IIA, IIB, IIIA and IIIB). These results were in agreement with those obtained by both Zoccali et al, [18] and Matsubara et al, [13] who reported that hyperinsulinemia downregulates plasma adiponectin levels among dialysis patients (non-diabetic uremic and diabetic uremic). This inverse relation between insulin and adiponectin may be due to decreased tyrosin phosphorylation of muscle insulin receptors when adiponectin concentrations decrease, and the low levels are predictive of the subsequent deve­lopment of diabetes. [20] The present study demonstrated a significant negative correlation between serum adiponectin levels and BMI. Our results are compatible with those obtained by Zoccali et al, [18] who reported significantly more reduced adiponectin levels in obese subjects than those in lean, healthy, control subjects. The link between BMI and adiponectin seems to be a causal one, because weight loss induces a marked increase in plasma adiponectin levels among both nor­mal individuals and type-2 diabetic patients. [21] The inverse correlation between adiponectin levels and BMI suggests presence of a feed­back inhibition process as the total body fat mass increases, perhaps by increased secretion of other adipokines, such as TNF-α, which has been shown to decrease the expression of adiponectin from cultured adipocytes;[22] ano­ther possibility is the decrease in metabolic function of aged adipocytes, which became not only more insulin resistant and have decreased gene expression of adiponectin compared with young adipocytes. [23]

The current study revealed a significant nega­tive correlation between serum adiponectin level and each of serum cholesterol, serum TG and serum LDL in all patients (groups IIA, IIB, IIIA and IIIB) and a significant positive correlation of adiponectin serum levels and serum HDL in the same groups. These results are in agreement with those obtained by both Deborah et al, [24] and Zoccali et al. [18]

Our study revealed a significant negative correlation between adiponectin serum levels and MABP in all uremic patients, and this is consistent with those obtained by both Emilio et al. [25] and Iwashima et al, [26] which may be related to an increase in the sympathetic nervous activity, which may inhibit adiponectin gene expression via adrenergic stimu­lation and induced activation of the renin angiotensin system in the adipose tissue by hypoadiponectinemia. [27]

The relation between adiponectin serum levels and insulin resistant status in our study is consistent collectively with those obtained by Salvado et al, [28] who found significantly de­creased plasma adiponectin levels, which in­creased after weight loss, in obese subjects and insulin-resistant and diabetic patients. [20]

The present study revealed significantly lower adiponectin serum levels in diabetic and non-diabetic patients with CVC than in those without CVC. Our results are supported by the results of Ouchi et al, [9] who demonstrated that adiponectin levels were reduced among non-diabetic and non-uremic patients with CVC. Moreover, our results are consistent with those of Hotta et al, [5] who found that subjects with higher adiponectin levels had a significantly decreased risk of myocardial infarction even after adjustment for LDL, HDL levels, BMI, history of diabetes and hypertension at base­line. This relation between reduced adiponectin levels and cardiovascular risk may be explained by binding of adiponectin to matrix proteins such as collagen I, III and V but not collagen II and IV or laminin or fibronectin, [29] and this may explain why it accumulates in injured vascular tissue, where it may intervene with the repair process. Adiponectin interferes with TNF-α-induced endothelial cell NF-α B signaling [30] and inhibits the phagocytic activity of macrophages. The initial steps in atherogenesis comprise increased expression of ad­hesion molecules on endothelial cells, permit­ting monocyte adhesion and invasion, and adiponectin is thought to inhibit the endothelial expression of the adhesion molecules VCAM-1, ICAM-1 and E-selectin, which are triggered by inflammatory cytokines such as TNF-α. Adiponectin also suppresses the production of cytokines such as TNF-α in macrophages. Similar results were obtained by Zoccali et al, who found that reduced adiponectin levels seem to be a strong and independent predictor of cardiovascular outcomes.

Accordingly, adiponectin may have a protec­tive role for the cardiovascular system among the ESRD patients, as the inflammatory res­ponse detected in atherosclerotic lesions is effectively counteracted by adiponectin.

In conclusion, serum adiponectin levels in­crease in uremic patients with and without diabetes, and are significantly associated with dyslipidemia, insulin resistance and CVC.

 
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Correspondence Address:
Tarek A Ghonemy
Internal Medicine and Nephrology Unit, Faculty of Medicine, Zagazig University, P. O. Box 44519, Zagazig
Egypt
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DOI: 10.4103/1319-2442.98151

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