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      Measurement of Salivary Resistin Level in Patients with Type 2 Diabetes

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          Abstract

          Serum resistin was initially hypothesized as a link between obesity and insulin resistance in mice. The latest evidence suggests that serum resistin is proinflammatory cytokines. Inflammation plays a key role in the pathogenesis of type 2 diabetes mellitus (T2DM). Many reports have previously identified changed serum resistin levels in patients with T2DM, but little is known of the levels of resistin in saliva. In our study, saliva and serum samples were collected from 38 patients with newly diagnosed T2DM at each time point of OGTT and 35 nondiabetic controls at fasting state. Resistin concentrations were measured using ELISA. We have demonstrated the presence of resistin in saliva of T2DM and nondiabetic subjects. Saliva resistin levels of T2DM are significantly higher than those of nondiabetic controls. Resistin levels in saliva are not affected by eating activity and correlated with serum resistin levels at any time points of OGTT. A positive correlation of serum and salivary resistin with BMI and HOMA-IR existed in T2DM. Measurement of resistin in saliva is a simple, noninvasive and may be an acceptable alternative to blood sampling for evaluatinginflammation/obesity/insulin resistance state.

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          Resistin, an adipokine with potent proinflammatory properties.

          Maria I Bokarewa, Ivan Nagaev, Leif Dahlberg … (2005)
          The adipokine resistin is suggested to be an important link between obesity and insulin resistance. In the present study, we assessed the impact of resistin as inflammatogenic cytokine in the setting of arthritis. In vitro experiments on human PBMC were performed to assess cytokine response and transcription pathways of resistin-induced inflammation. Proinflammatory properties of resistin were evaluated in animal model by intra-articular injection of resistin followed by histological evaluation of the joint. Levels of resistin were assessed by ELISA in 74 paired blood and synovial fluid samples of patients with rheumatoid arthritis. Results were compared with the control group comprised blood samples from 34 healthy individuals and 21 synovial fluids from patients with noninflammatory joint diseases. We now show that resistin displays potent proinflammatory properties by 1) strongly up-regulating IL-6 and TNF-alpha, 2) responding to TNF-alpha challenge, 3) enhancing its own activity by a positive feedback, and finally 4) inducing arthritis when injected into healthy mouse joints. Proinflammatory properties of resistin were abrogated by NF-kappaB inhibitor indicating the importance of NF-kappaB signaling pathway for resistin-induced inflammation. Resistin is also shown to specifically accumulate in the inflamed joints of patients with rheumatoid arthritis and its levels correlate with other markers of inflammation. Our results indicate that resistin is a new and important member of the cytokine family with potent regulatory functions. Importantly, the identified properties of resistin make it a novel and interesting therapeutic target in chronic inflammatory diseases such as rheumatoid arthritis.
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            A cysteine-rich adipose tissue-specific secretory factor inhibits adipocyte differentiation.

            H. Kim, De-Hyung Lee, Y Moon … (2001)
            A 12.5-kDa cysteine-rich adipose tissue-specific secretory factor (ADSF/resistin) is a novel secreted protein rich in serine and cysteine residues with a unique cysteine repeat motif of CX(12)CX(8)CXCX(3)CX(10)CXCXCX(9)CC. A single 0.8-kilobase mRNA coding for this protein was found in various murine white adipose tissues including inguinal and epididymal fats and also in brown adipose tissue but not in any other tissues examined. Two species of mRNAs with sizes of 1.4 and 0.8 kilobases were found in rat adipose tissue. Sequence analysis indicates that this is because of two polyadenylation signals, the proximal one with the sequence AATACA with a single base mismatch from murine AATAAA and the distal consensus sequence AATAAA. The mRNA level was markedly increased during 3T3-L1 and primary preadipocyte differentiation into adipocytes. Its expression in adipose tissue is under tight nutritional and hormonal regulation; the mRNA level was very low during fasting and increased 25-fold when fasted mice were refed a high carbohydrate diet. It was also very low in adipose tissue of streptozotocin-diabetes and increased 23-fold upon insulin administration. Upon treatment with the conditioned medium from COS cells transfected with the expression vector, conversion of 3T3-L1 cells to adipocytes was inhibited by 80%. The regulated expression pattern suggesting this factor as an adipose sensor for the nutritional state of the animals and the inhibitory effect on adipocyte differentiation implicate its function as a feedback regulator of adipogenesis.
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              Circulating adiponectin and resistin levels in relation to metabolic factors, inflammatory markers, and vascular reactivity in diabetic patients and subjects at risk for diabetes.

              G. K. Shetty, P. A. Economides, E S Horton … (2004)
              Adiponectin and resistin, two recently discovered adipocyte-secreted hormones, may link obesity with insulin resistance and/or metabolic and cardiovascular risk factors. We performed a cross-sectional study to investigate the association of adiponectin and resistin with inflammatory markers, hyperlipidemia, and vascular reactivity and an interventional study to investigate whether atorvastatin mediates its beneficial effects by altering adiponectin or resistin levels. Associations among vascular reactivity, inflammatory markers, resistin, and adiponectin were assessed cross-sectionally using fasting blood samples obtained from 77 subjects who had diabetes or were at high risk to develop diabetes. The effect of atorvastatin on adiponectin and resistin levels was investigated in a 12-week-long randomized, double-blind, placebo-controlled study. In the cross-sectional study, we confirm prior positive correlations of adiponectin with HDL and negative correlations with BMI, triglycerides, C-reactive protein (CRP), and plasma activator inhibitor (PAI)-1 and report a negative correlation with tissue plasminogen activator. The positive association with HDL and the negative association with PAI-1 remained significant after adjusting for sex and BMI. We also confirm prior findings of a negative correlation of resistin with HDL and report for the first time a positive correlation with CRP. All of these associations remained significant after adjusting for sex and BMI. No associations of adiponectin or resistin with any aspects of vascular reactivity were detected. In the interventional study, atorvastatin decreased lipid and CRP levels, but adiponectin and resistin were not specifically altered. We conclude that adiponectin is significantly associated with inflammatory markers, in part, through an underlying association with obesity, whereas resistin's associations with inflammatory markers appear to be independent of BMI. Lipid profile and inflammatory marker changes produced by atorvastatin cannot be attributed to changes of either adiponectin or resistin. Copyright 2004 American Diabetes Association
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                Author and article information

                Journal
                Journal ID (nlm-ta): Int J Endocrinol
                Journal ID (iso-abbrev): Int J Endocrinol
                Journal ID (publisher-id): IJE
                Title: International Journal of Endocrinology
                Publisher: Hindawi Publishing Corporation
                ISSN (Print): 1687-8337
                ISSN (Electronic): 1687-8345
                Publication date (Print): 2012
                Publication date (Electronic): 30 August 2012
                Volume: 2012
                Electronic Location Identifier: 359724
                Affiliations
                1Endocrine Key Laboratory of the Ministry of Health, Department of Endocrinology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, No. 1 Shuaifuyuan, Wangfujing, Beijing 100730, China
                2First Affiliated Hospital, Shanxi Medical University, Taiyuan 030001, China
                Author notes

                Academic Editor: Panayoula C. Tsiotra

                Article
                DOI: 10.1155/2012/359724
                PMC ID: 3437284
                PubMed ID: 22969799
                SO-VID: dfc9bcaa-53c1-45ea-a531-9d380ac1d182
                Copyright © Copyright © 2012 Jinhua Yin et al.
                License:

                This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 17 May 2012
                Date accepted : 16 July 2012
                Categories
                Subject: Clinical Study

                ScienceOpen disciplines: Endocrinology & Diabetes
                Data availability:
                ScienceOpen disciplines: Endocrinology & Diabetes

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