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ORIGINAL ARTICLE
Year : 2014  |  Volume : 17  |  Issue : 6  |  Page : 735-738

Effect of chronic kidney disease on serum resistin level


1 Department of Biochemistry, Calcutta Medical College, Kolkata, India
2 Department of Life Sciences, Tejganj High School, Burdwan, West Bengal, India
3 Department of Pharmacology, Calcutta Medical College, Kolkata, India
4 Department of Physiology, Calcutta Medical College, Kolkata, India
5 Department of General Surgery, Calcutta Medical College, Kolkata, India

Date of Submission21-Mar-2014
Date of Web Publication11-Nov-2014

Correspondence Address:
S Dan
FE 367, Salt Lake, Kolkata 700 106, West Bengal
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/1119-3077.144387

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   Abstract 

Background: Chronic Kidney Diseases (CKD) of all etiologies are usually associated with Insulin Resistance (IR). Resistin is also a protein associated with IR. Some studies conducted abroad have shown that resistin level is higher among CKD patients.
Objective: To test if serum resistin level is significantly higher in CKD patients compared to normal individuals.
Patients and Methods: 96 CKD patients and 97 normal individuals were included in the study. Written informed consent was obtained from every individual.
Results: Serum resistin level was higher in CKD patients compared to control subjects. The difference in serum resistin level between two groups was statistically significant.
Conclusion: Our study is probably the first study in India comparing serum resistin levels of CKD patients vis-à-vis control subjects. Further cellular research may be needed to explore this relation.

Keywords: Chronic kidney disease, HOMA-IR, insulin resistance, resistin


How to cite this article:
Dan S, Aditya P, Banerjee P, Bal C, Roy H, Banerjee I. Effect of chronic kidney disease on serum resistin level. Niger J Clin Pract 2014;17:735-8

How to cite this URL:
Dan S, Aditya P, Banerjee P, Bal C, Roy H, Banerjee I. Effect of chronic kidney disease on serum resistin level. Niger J Clin Pract [serial online] 2014 [cited 2019 Sep 17];17:735-8. Available from: http://www.njcponline.com/text.asp?2014/17/6/735/144387


   Introduction Top


Although great strides have been made in the field of medicine, chronic kidney disease (CKD) and end stage renal disease (ESRD) remain major public health challenges. Globally, the numbers of CKD patients and as a corollary, ESRD patients on maintenance hemodialysis have gone up in virtually all countries in last two decades.

In India, the approximate prevalence of CKD is 800 per million population (pmp), and the incidence of ESRD is 150-200 pmp. [1] In India, with a population base of 1 billion and an estimated incidence of ESRD of 100 pmp, approximately 100,000 patients develop ESRD each year. [2]

Chronic kidney disease of any etiology is associated with insulin resistance (IR) of primarily peripheral tissues resulting in varying degrees of hyperinsulinemia and glucose (Glu) intolerance. [3],[4] Decreased response to insulin is manifest already in mild renal dysfunction [5] and progresses with declining glomerular filtration rate (GFR). [3],[6] The proposed link(s) between declining renal function and IR appear to act mainly in peripheral tissues, [3] but the exact mechanisms have so far not been clarified, [7] and a variety of possible pathological processes have been proposed.

Resistin is a protein secreted by monocytes, macrophages, bone marrow cells and adipose tissue. [8] It has been shown to inhibit the action of insulin in-vitro. [9],[10],[11] Its level is usually higher in patients with IR.

It has been proposed that resistin may be higher in CKD. A study has lent credence to this view. [12],[13],[14]

As the study linking resistin with CKD has been performed abroad, we intend to verify if the relationship of higher resistin with CKD holds well in Indian circumstances too.


   Materials and Methods Top


Patients

Patients were recruited from the out-patient department of tertiary care hospital after obtaining ethical clearance. This study was performed in accordance with the Helsinki declaration and written informed consent was obtained from each participant. Ninety-six patients were included in CKD group, whereas 97 patients were included in the control group. The following selection criteria were used for patient recruitment:

Inclusion criteria

Chronic kidney disease patients and body mass index (BMI), age and sex matched normal individuals.

Exclusion criteria

We did not recruit obese patients, diabetics, metabolic syndrome patients, endocrinopathy patients and nephrotic syndrome patients for this study. For metabolic syndrome, diagnostic criteria by International Diabetes Federation were used.

As per the National Kidney Foundation Kidney Disease Outcome Quality Initiative guideline, patients with estimated GFR (eGFR) <60 ml/min/1.73 m 2 for at least 3 months were included in CKD group. eGFR was calculated using Modification of Diet in Renal Disease formula.

None of the CKD patients was on hemodialysis or peritoneal dialysis.

Study protocol

Before collection of data or blood sample, each patient was explained the details of the study including rationale, expected benefits, risk profile, confidentiality safeguards and study protocol. For some patients, help of appropriate interpreter(s) was taken. Only those patients who were willing to follow the study protocol and gave their written consent were included in this study. There was neither any financial cost nor any financial incentive for the patient for being part of the study.

Appropriate blood samples were collected from CKD patients. For estimation of serum insulin (Ins) level, serum high sensitive C-reactive protein (hsCRP) level, serum urea (UR) level, serum creatinine (Cr) level, fasting blood sample was drawn into serum (without anticoagulant) gel containing yellow color capped  BD Vacutainer tubes. For plasma Glu level, blood sample were drawn into fluoride-oxalate anticoagulant containing gray color capped BD Vacutainer tubes. Both the afore-mentioned samples were drawn on the same day (at closest possible intervals). All samples were immediately centrifuged, separated and stored at −70°C until analysis for the relevant biochemical parameters.  The following parameters were measured by Dimension RXL Max autoanalyzer:

1. Plasma Glu was measured by hexokinase principle

2. Plasma hsCRP was measured by turbidimetric principle

3. Plasma Ur was measured by urease principle

4. Plasma Cr was measured by alkaline picrate kinetic principle

5. Serum albumin was measured by bromocresol purple dye-binding method.

Serum resistin was measured using ELISA principle (LINCO Research, USA).

Serum Ins was measured by Abbott AxSYM is based on microparticle enzymes immunoassay technique.

Patients' recent-most blood/plasma/serum values of the afore-mentioned biochemical parameters were noted if already available, provided they were done on the same day.

Patients' primary etiology of nephropathy, disease history and treatment history were noted.

Patients' current medication details were noted.

Patients' demographic profiles including age, sex were noted.

Postdata collection, patients were divided into two groups- CKD and control. The serum levels of resistin, Ins, hsCRP, UR, Cr, albumin and plasma Glu between the two groups were compared for the presence or absence of statistical significance.

Homeostatic model assessment of IR [15] (HOMA-IR) was calculated by the formula:

Statistical analysis

 The statistical software Minitab 16 was used to analyze the data. Values of continuous variables were expressed as mean ± one standard deviation unless otherwise indicated, and differences in mean values between two groups were analyzed using Student's t-test. Descriptive information regarding categorical variable were presented as frequency. Test for equality of two proportions was used for comparison of categorical data. All tests were two-tailed and considered statistically significant if P < level of significance, 0.05.


   Results Top


Serum fasting insulin (15.4 ± 2.5 vs. 8.3 ± 1.6; mIU/mL), HOMA-IR (3.92 [0.15] vs. 1.97 [0.14]), serum hsCRP (7.7 ± 4.9 vs. 3.5 ± 1.6; mg/L), serum UR (69 ± 18 vs. 29 ± 9; mg/dL), serum Cr (2.9 ± 1.1 vs. 0.9 ± 0.4; mg/dL), serum resistin (22.2 [3.4] vs. 10.1 [1.9)] levels were significantly higher in CKD patients compared to age and sex matched control individuals. Serum albumin level was significantly lower (3.9 ± 1.1 vs. 4.4 ± 1.0; g/dL) in CKD patients compared with age and sex matched control individuals [Table 1].
Table 1: Comparison of anthropological, demographic,
and biochemical statistics between CKD and control
groups


Click here to view



   Discussion Top


Resistin is a 12.5-kDa cysteine-rich protein secreted mainly by adipocytes. Resistin circulates in serum in at least two distinct assembly forms that appear to have different levels of bioactivity. [16]

In animal studies, administration of recombinant resistin has been shown to impair Glu tolerance and decrease the action of insulin. The animals treated with resistin-neutralizing antibodies [17] show an increase in insulin sensitivity. Genetic studies in humans suggest that a polymorphism in the promoter region of the resistin gene can affect transcription factor binding, [18] thus influencing messenger ribonucleic acid (mRNA) levels [19] and may be associated with Glu intolerance in obese individuals. [20],[21] Resistin has consequently been shown to be influenced by BMI. [22]

However, any clear consensus on the role of resistin in IR, hepatic and peripheral, is yet to emerge. [23],[24] This lack of consensus may be due to the fact that mRNA level and protein expression of resistin may not always correlate. [25]

Our study confirms the finding of an earlier study [11] that plasma resistin level is higher in CKD patients in comparison to age and sex matched control (nonCKD) individuals. The HOMA-IR levels of two groups were also statistically significantly different.

Several factors may be responsible for elevation of resistin level in CKD.

As resistin is a 12.5 kDa protein, it is likely that this small protein will have similar renal clearance characteristics as β2-microglobulin (13.7 kDa), which has been extensively studied. [26] If renal route, as is the case with β2-microglobulin, is the principal excretory mechanism for resistin, then reistin level should rise with decline in GFR. This has been ascertained in an earlier study. [27]

Resistin production is mediated by pro-inflammatory cytokines. [28] Resistin also mediates production of inflammatory cytokines. [29],[30],[31] The principal sites of resistin production are adipose tissue, bone marrow [12] etc. The association between resistin level and levels of pro-inflammatory cytokines has already been proved. [32],[33],[34],[35] CKD is a state of chronic inflammation, even at mild or moderate level of renal function impairment. [36],[37] Resistin has been found to be elevated in nonobese CKD patients. [11] Antihypertensives viz. Losartan has been shown to ameliorate renal injury by controlling the adipocytokine imbalance. [38]

In cultured human vascular endothelial cells, resistin is able to induce expression of adhesion molecules vascular cell adhesion molecule-1 and intercellular adhesion molecule-1, an effect that is inhibited by adiponectin. [20] In vitro studies have demonstrated resistin mRNA expression in peripheral blood monocytes, with increased levels after stimulation by interleukin (IL)-1, IL-6, and tumor necrosis factor-α, as well as with lipopolysaccharides. [19],[21] It has also been demonstrated that plasma resistin levels correlate with markers of inflammation and predict coronary atherosclerosis in humans independently of CRP. [39]


   Conclusion Top


This study confirms the findings of earlier studies conducted abroad. To the best of our knowledge, ours is the first study exploring the association between CKD and serum resistin level in Eastern Indian population. Further confirmatory clinical studies and cellular research may be needed to explore this relation. Whether resistin may serve as an early marker of chronic inflammation and cardio vascular diseases in CKD patients may be explored in large scale multi centered studies.

 
   References Top

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