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C1q/TNF-related protein-6 is associated with insulin resistance and the development of diabetes in Chinese population

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Abstract

Aims

C1q/tumor necrosis factor-related protein-6 (CTRP6) is a novel adipokine and has emerged as an important mediator for lipid and glucose metabolism. However, to date, the relationship between CTRP6 and T2DM in humans has not been demonstrated. Our objective is to investigate the association of circulating CTRP6 with T2DM in a cross-sectional study.

Methods

118 patients with newly diagnosed T2DM, 98 subjects with impaired glucose tolerant (IGT) and 132 healthy subjects were recruited for this study. OGTT were performed in 48 healthy individuals to investigate the association of CTRP6 with glucose, insulin and other adipokines. Circulating CTRP6, TNF-α and Adipoq were measured by ELISA.

Results

IGT and T2DM individuals had higher serum CTRP6 levels than healthy controls (406.2 ± 136.6 and 539.1 ± 169.7 vs. 354.3 ± 117.2 ng/mL; both P < 0.01), whereas serum CTRP6 concentrations were further increased in T2DM patients compared with IGT individuals (P < 0.01). Serum CTRP6 levels were found to be related positively to BMI, WHR, FAT%, TC, TG, HbA1c, FBG, 2 h-OGTT, fasting insulin (FIns), 2 h-Ins, HOMA-IR and TNF-α, and negatively with HDL-C and Adipoq in all individuals (P < 0.05 or P < 0.01). Multivariate logistic regression analysis demonstrated that CTRP6 was correlated with both IGT and T2DM. After an oral glucose challenge, serum CTRP6 concentrations exhibited a similar change with blood glucose, insulin, TNF-α and Adipoq.

Conclusions

CTRP6 may be a metabolism- and nutrition-related adipokine and may be related to insulin resistance and T2DM.

Trial registrations

Clinical Trial Registration Number: ChiCTR-OCC-11001422. Registration name: Plasma cytokines and endothelial function in type 2 diabetes

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Abbreviations

CTRP6:

C1q/tumor necrosis factor-related protein-6

T2DM:

Type 2 diabetes mellitus

IGT:

Impaired glucose tolerant

NGT:

Normal subjects

OGTT:

Oral glucose tolerance tests

BMI:

Body mass index

WHR:

Waist-to-hip ratio

FAT%:

The percentage of body fat

HDL-C:

High-density lipoprotein cholesterol

TC:

Total cholesterol

TG:

Triglyceride

FBG:

Fasting blood glucose

2-h OGTT:

2-h blood glucose after glucose overload

FIns:

Fasting insulin

2-hIns:

2-h plasma insulin after glucose overload

HOMA-IR:

Homeostasis model assessment of insulin resistance

Adipoq:

Adiponectin

TNF-α:

Tumor necrosis factor-α

AUCglucose :

The area under the curve for insulin

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Acknowledgements

This work was supported by Grant 2017MSXM20 and 2016MSXM083 from the Science and Technology key Program of Health Bureau of Chongqing, China.

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Authors and Affiliations

Authors

Contributions

GY and XZ designed this research (included project conception, development of overall research plan); XT, MW and WD supervised the studies, contributed to the discussion, and revised/edited the article. DL and HL collected the data and conducted the research; HZ provided essential reagents; LL, XZ interpreted the data and drafted the article; GY had primary responsibility for final content. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Xili Zhao or Gangyi Yang.

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The authors declare that there is no duality of interest associated with this manuscript. The authors declare no conflict of interest.

Statement of human rights

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

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Wang, M., Tang, X., Li, L. et al. C1q/TNF-related protein-6 is associated with insulin resistance and the development of diabetes in Chinese population. Acta Diabetol 55, 1221–1229 (2018). https://doi.org/10.1007/s00592-018-1203-2

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  • DOI: https://doi.org/10.1007/s00592-018-1203-2

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