Key result
L-carnitine administration significantly reduced apelin and APJ gene expressions in the adipose tissue of diabetic rats, improving metabolic disorders.
Why the study?
This study aimed to investigate the effects of oral L-carnitine administration on adipose tissue expression of apelin and its receptor (APJ) in experimentally induced insulin-resistant and type 2 diabetic rats.
Does L-carnitine regulate apelin and APJ expression in adipose tissue and improve metabolic disorders in diabetic rats?
Does L-carnitine regulate apelin and APJ expression in adipose tissue and improve metabolic disorders in diabetic rats?
L-carnitine administration reduces apelin and APJ expression in adipose tissue and decreases inflammatory markers in a rat model of type 2 diabetes.
Hypothesis-generating for L-carnitine in diabetic adipose inflammation; leaves open translation to human metabolic outcomes.
Apelin is a new adipocytokine that acts as an endogenous hormone in various tissues through its receptor (APJ). This study aimed to investigate the effects of oral administration of L-carnitine (LC) on the expression of Apelin and APJ in adipose tissue of experimentally induced insulin-resistant and type 2 diabetic rats. In this experimental study, 60 male rats fed with high fat/high carbohydrate (HF/HC) diet. After 50 mg/kg intraperitoneally injection of streptozotocin (STZ) and confirmation of diabetes (FBS higher than 126 mg/dl), the animals were daily treated with 300 mg/kg LC for 28 days. At days 7, 14, and 28 of posttreatment, the expression of apelin and APJ in adipose tissue were determined using qPCR in diabetic, diabetic + LC treated, control, and control + LC treated groups. Apelin, insulin, TNF-α, and IL1-β were measured by the ELISA method. Results demonstrated that the rats fed with the HF/HC diet for 5 weeks were hyperinsulinemic and normoglycemic, while after STZ injection, they showed hyperinsulinemia and hyperglycemia with higher levels of HOMA-IR. Apelin serum level, APJ and apelin gene expression in adipose tissue increased significantly with the development of diabetes compared to the control group. Treatment with LC for 14 days caused a reduction in apelin and APJ expressions in adipose tissue of diabetic rats. TNF-α and IL1-β levels were reduced in diabetic rats 14 days after their treatment with LC. The study results show that L-carnitine could act as a new regulator in apelin gene expression in adipose tissue, improving the metabolic disorders in diabetic patients.
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Kohan et al. (2020) studied Type 2 diabetes and insulin resistance (n=60). L-carnitine vs. Diabetic control (HF/HC diet + STZ) was evaluated on Apelin and APJ gene expression in adipose tissue (p=<0.05). L-carnitine administration significantly reduced apelin and APJ gene expressions in the adipose tissue of diabetic rats, improving metabolic disorders.
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