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Published on: March 31, 2016
The Expression of Adipose Tissue-Derived Cardiotrophin-1 in Humans with Obesity
Jacqueline Stephens1, Eric Ravussin2, Ursula White3
1Pennington Biomedical Research Center, Baton Rouge, LA 70808, USA. jsteph1@lsu.edu.
Insights
Cardiotrophin-1 (CT-1) expression in human fat tissue varies by location and is linked to metabolic health. Higher CT-1 in subcutaneous fat may protect against obesity and metabolic syndrome complications.
Area of Science:
- Endocrinology
- Metabolic Research
- Molecular Biology
Background:
- Cardiotrophin-1 (CT-1) is a cytokine linked to heart failure, obesity, and metabolic syndrome (MetS).
- Adipose tissue (AT) is an endocrine organ and a source of CT-1, but its human adipose-derived expression is unstudied.
- Rodent studies suggest CT-1 may be a therapeutic target for obesity and MetS.
Purpose of the Study:
- To analyze CT-1 mRNA expression in human subcutaneous adipose tissue depots.
- To investigate the association of adipose-derived CT-1 with clinical variables in obesity and during overfeeding.
Main Methods:
- Analysis of CT-1 mRNA expression in subcutaneous abdominal (scABD) and femoral (scFEM) adipose tissue depots.
- Correlation of CT-1 expression with visceral adiposity, intrahepatic lipid, and insulin sensitivity in obese women and men undergoing 8-week overfeeding.
Main Results:
- CT-1 expression was higher in scABD than scFEM adipose depots.
- In obese women, scFEM CT-1 expression negatively correlated with visceral adiposity and intrahepatic lipid, and positively with insulin sensitivity.
- In men, higher baseline CT-1 levels correlated with preserved insulin sensitivity after overfeeding.
Conclusions:
- Adipose-derived CT-1 expression differs between human subcutaneous fat depots.
- CT-1 may play a protective role in metabolic health, influencing visceral adiposity and insulin sensitivity in obesity.
- CT-1 warrants further investigation as a potential therapeutic target for obesity and related metabolic disorders.
Abstract:
Cardiotrophin-1 (CT-1) is a gp130 cytokine that was previously characterized for its effects on cardiomyocytes and identified as a marker of heart failure. More recent studies reported elevated circulating levels of CT-1 in humans with obesity and metabolic syndrome (MetS). However, a subsequent rodent study implicated CT-1 as a potential therapeutic target for obesity and MetS. Adipose tissue (AT) is broadly acknowledged as an endocrine organ and is a substantial source of CT-1. However, no study has examined the expression of adipose-derived CT-1 in humans. We present the first analysis of CT-1 mRNA expression in subcutaneous AT and its association with clinical variables in 22 women with obesity and 15 men who were 40% overfed for 8-weeks. We observed that CT-1 expression was higher in the subcutaneous abdominal (scABD) than the femoral (scFEM) depot. Importantly, we reveal that scFEM but not scABD, CT-1 expression was negatively associated with visceral adiposity and intrahepatic lipid, while positively correlated with insulin sensitivity in obese women. Also, men with higher CT-1 levels at baseline had less of a decline in insulin sensitivity in response to overfeeding. Our data provide new knowledge on the regulation of adipose-derived CT-1 in obesity and during weight gain in response to overfeeding in humans and suggest that CT-1 may play a protective role in obesity and related disorders.
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