Abstract
Purpose
Serum complement C3 has been shown to contribute to the incidence of type 2 diabetes (T2D), but how serum complement C3 affects islet β-cell function throughout the course of T2D is unclear. This study explored whether serum complement C3 is independently associated with changes in islet β-cell function over time in patients with T2D.
Methods
Serum complement C3 was measured, and endogenous β-cell function was evaluated by area under the C-peptide curve (AUCcp) during an oral glucose tolerance test (OGTT) in 411 patients with T2D at baseline from 2011 to 2015. Next, 347 of those patients with available data were pooled for a final follow-up analysis from 2014 to 2018. Changes in islet β-cell function at follow-up were evaluated by AUCcp percentage changes (ΔAUCcp%). In addition, other possible clinical risks for diabetes were also examined.
Results
The 347 patients included in the analysis had a diabetes duration of 4.84 ± 3.63 years at baseline. Baseline serum complement C3 (baseline C3) levels were positively correlated with baseline natural logarithm of AUCcp (lnAUCcp) (n = 347, r = 0.288, p < 0.001), and baseline C3 was independently associated with baseline lnAUCcp (β = 0.17, t = 3.52, p < 0.001) after adjustment for baseline glycemic status and other clinical confounders by multivariate liner regression analysis. Compared with the baseline values, complement C3 changes (ΔC3) and ΔAUCcp% was –0.15 ± 0.28 mg/ml and –17.2 ± 18.4%, respectively, at a follow-up visit 4.57 ± 0.78 years later. Moreover, ΔC3 was positively correlated with ΔAUCcp% (n = 347, r = 0.302, p < 0.001). Furthermore, each 0.1 mg/ml increase in ΔC3 was associated with a higher ΔAUCcp% (1.41% [95% CI, 0.82–2.00%]) after adjusting for changes in glycemic status and other clinical confounders at follow-up.
Conclusions
In addition to serum complement C3 being independently associated with islet β-cell function at baseline, its changes were also independently associated with changes in islet β-cell function over time in patients with T2D.
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Abbreviations
- T2D:
-
type 2 diabetes
- AUCcp :
-
area under the C-peptide curve
- lnAUCcp :
-
natural logarithm of AUCcp
- ΔAUCcp%:
-
percentage AUCcp change
- AUCglu :
-
area under the glucose curve
- baseline C3:
-
complement C3 at baseline
- ΔC3:
-
changes in complement C3
- OGTT:
-
oral glucose tolerance test
- BMI:
-
body mass index
- SBP/DBP:
-
systolic/diastolic blood pressure
- serum UA:
-
serum uric acid
- TG:
-
triglyceride
- TC:
-
total cholesterol
- LDLC:
-
low-density lipoprotein cholesterol
- HDLC:
-
high-density lipoprotein cholesterol
- eGFR:
-
estimated glomerular filtration rate
- IScp :
-
insulin sensitivity from C-peptide
- HbA1c:
-
glycosylated hemoglobin A1c
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Funding
This study was funded by the Social Development Projects of Nantong (HS2012028, MS22015065) and the Medical Research Project of Jiangsu Health Commission (QNRC2016408).
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The study design was authorized by the ethical committee of Affiliated Hospital 2 of Nantong University in accordance with the principles of the Declaration of Helsinki.
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Su, Jb., Wu, YY., Xu, F. et al. Serum complement C3 and islet β-cell function in patients with type 2 diabetes: A 4.6-year prospective follow-up study. Endocrine 67, 321–330 (2020). https://doi.org/10.1007/s12020-019-02144-z
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DOI: https://doi.org/10.1007/s12020-019-02144-z