Lipokines from browning adipose tissue regulate systemic metabolism to resist obesity

Obesity is characterised by high levels of body fat leading to a body mass index of over 30. Over 650 million people worldwide are living with obesity. Obesity increases the risk of cardiovascular disease, some cancers and type 2 diabetes (T2D). Given the number of people affected, the impact on their quality of life and the burden on healthcare, finding new treatments is essential.
Energy balance is a key concept behind our understanding of metabolism and metabolic diseases like obesity. The balance between energy uptake (food intake), and energy expenditure (everyday biological processes / physical activity) determines whether a person is lean or obese. A chronic imbalance in energy, with excess uptake in combination with reduced expenditure, leads to increased storage of energy as fats within white fat cells in white fat tissue and can lead to metabolic diseases including obesity and T2D.
Many biological processes relevant to the development or treatment of obesity involve fat tissue. White fat tissue, once considered only as an energy-storage depot, is now known to be the source of key biological signals, known as adipokines, which are released into the blood and communicate to other organs to regulate whole-body metabolism. Not all fat cells are the same, however. A second group of fat cells, known as brown fat cells, regulate body temperature by "burning" stored fats to produce heat. A third group, known as beige fat cells, can switch from behaving like a white fat cell (storing fat) to functioning like a brown fat cell (burning fat), in a process known as "browning". In humans, beige fat makes up the majority of this heat producing tissue but is also found within white fat tissue and once activated has anti-obesity effects. Recent studies, including our own, suggest several of the anti-obesity properties of beige fat may occur by non-heat producing effects through the release of signals into the blood which communicate with other tissues...