The Circulating Levels of CTRP1 and  CTRP5  Are Associated with Obesity Indices and  Carotid Intima-Media Thickness (cIMT) Value in Patients with Type 2 Diabetes: A Preliminary Study

Background: There is growing evidence that the C1qTNF-related protein (CTRP) family has a crucial role in the physiology and pathophysiology of metabolic disorders such as Type 2 Diabetes (T2D) and obesity. We sought to identify the association of CTRP1 and CTRP5 circulating levels with various obesity parameters such as visceral adipose tissue (VAT) thickness, visceral adiposity index (VAI), and with carotid intima-media thickness (cIMT) in patients with T2D and healthy subjects. Methods: This preliminary study consisted of men with T2D (n=42) and men without T2D (n=42). cIMT and VAT thickness measurement was performed using an Accuvix XQ ultrasound. Circulating levels of CTRP1, CTRP5, and adiponectin were measured by enzyme-linked immunosorbent assay (ELISA). Results: CTRP-1 and CTRP1/CTRP5 ratio was markedly higher in patients with T2D compared to controls (p < 0001 and p = 0004 respectively). Interestingly, binominal logistic regression revealed that a higher circulating level of CTRP1 was associated with the presence of T2D (odds ratio [OR]: 1.009 [95% CI: 1.004-1.015]; P=.001). CTRP1 circulating levels were correlated with WHR, VAT, and HOMA-IR in the whole population study. Also, we observed that the ratio of CTRP1 to CTRP5 in plasma (β = 0.648, P=0.005) and CTRP5 circulating levels (β = 0.444, P=0.049) are independently associated with cIMT value. Conclusions: Our results indicated that CTRP1 and CTRP5 concentrations were correlated with atherosclerosis in men with T2D and these adipokines might have a causal role for cardiometabolic risk in T2D.However, more studies in large sample sizes are required to clarify the role of CTRPs in T2D pathogenesis.