Scientists have found a tiny switch inside brown fat cells that can turn on a hidden energy‑burning system. This discovery could help create new ways to treat bone problems.
How Brown Fat Burns Energy
Brown fat is different from the white fat that stores calories. It burns calories to make heat and keep the body warm. For a long time, researchers thought only one pathway made this heat.
Recent work showed a second pathway exists, but nobody knew what started it. A team led by Lawrence Kazak at McGill University finally identified the trigger.
The Glycerol Switch
When we get cold, the body breaks down fat and releases a molecule called glycerol. The researchers saw that glycerol fits into a special spot on an enzyme named TNAP. This spot is called the glycerol pocket.
When glycerol binds there, the second heat‑making pathway, known as the futile creatine cycle, turns on.
“We finally know how the backup heat system works, separate from the classic one,” said Kazak.
Why This Matters for Bones
TNAP is also important for building strong bones. If TNAP does not work well, people can develop a rare condition called hypophosphatasia, which makes bones soft and prone to breaking.
The new study shows that the same glycerol‑TNAP switch that powers brown fat also helps bone‑forming cells work correctly.
Scientists think that drugs that boost this switch could improve bone mineralization and help people with weak bones.
Next Steps
The research paper, titled “Glycerol‑driven TNAP activation in thermogenesis and mineralization,” appeared in Nature. The work involved collaborators from several universities and received funding from Canadian health‑research agencies.
Dozens of possible drug candidates are already being examined for safety and effectiveness.