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Leptin

Plasma leptin concentrations are not limited to the brain

The researchers discovered that the mechanisms by which reductions in plasma leptin concentrations stimulate food intake are not limited to the brain, as previously thought

Yale researchers have offered insight into leptin - a hormone that plays a key role in appetite, overeating and obesity - heir findings advance knowledge about leptin and weight gain, and also suggest a potential strategy for developing future weight-loss treatments, they said.

The study, ‘Leptin’s hunger-suppressing effects are mediated by the hypothalamic–pituitary–adrenocortical axis in rodents’, led by investigators at Yale and Harvard and published in the journal PNAS.

Leptin, which is secreted by fat cells, informs the brain when fuel stored in body fat and in the liver is becoming depleted. It has not been well understood how low leptin concentrations in plasma - the largest component of blood - increase appetite. The researchers studied the biology of leptin in rodents. They also investigated the influence of nerve cells in the brain known as AgRP neurons, which regulate eating behaviour.

The researchers discovered that the mechanisms by which reductions in plasma leptin concentrations stimulate food intake are not limited to the brain, as previously thought. In rodents, fasting first activates leptin receptors in the brain, followed by an intermediary step that involves the endocrine system. This system includes the pituitary and adrenal glands, which secrete another hormone, corticosterone, that regulates energy, stress responses and food intake.

The research team learned that this chain of events is required for leptin to stimulate hunger when food is restricted or when diabetes is poorly controlled and plasma leptin concentrations drop below a critical threshold, said Dr Gerald Shulman, the George R Cowgill Professor of Medicine at Yale School of Medicine, and co-corresponding author of the study.

In further experiments, the researchers also showed that plasma corticosterone activates AgRP neurons, which increases hunger when either leptin or blood-sugar levels are low, Shulman noted. In humans, leptin and blood sugar drop when people diet.

These findings add to scientists' knowledge of leptin, which has been the focus of research on obesity and weight loss since its discovery in the 1990s. The research also lends support to a different strategy for developing drugs that treat obesity.

The study reveals "the basic biology of leptin, and how the endocrine system is mediating its effect to regulate food intake under conditions of starvation and poorly controlled diabetes," said Shulman. "It suggests that AgRP neurons may be an attractive therapeutic target."

To access this paper, please click here

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