In mouse brain cells called POMC neurons, leptin does not directly change how T-type calcium channels open or close; instead, it affects these channels indirectly by causing the cell membrane to...
Mechanism
Synthesis from 1 study
Leptin doesn't touch the calcium channels directly. It opens other channels first, which changes the electrical charge inside the cell. That change turns on the calcium channels by pushing them into the right voltage range, making the cell fire signals more easily.
Most probable mechanism
Leptin binds to receptors on specific brain cells, which opens special channels that let sodium and calcium into the cell. This makes the inside of the cell more electrically positive, which pushes nearby calcium channels into an active state. These calcium channels then open and let in more calcium, making the cell fire electrical signals more easily. The leptin does not touch the calcium channels directly — it only works by changing the cell’s electrical state first.
Leptin binds to its receptor on hypothalamic POMC neurons
Receptor activation triggers intracellular signaling that opens TRPC1/5 channels
TRPC1/5 channels allow influx of sodium and calcium ions, depolarizing the membrane potential by approximately 6 mV
Membrane depolarization shifts the voltage dependence of adjacent T-type (CaV3.1/CaV3.2) calcium channels into their active window range
T-type calcium channels increase their open probability and steady-state current without changes in peak density or kinetic properties
Calcium influx through T-type channels creates a localized microdomain that further depolarizes the membrane to action potential threshold
TRPC1/5 and T-type calcium channels form a physical complex that enables functional coupling within a subcellular microdomain
Action potentials are generated, increasing the intrinsic excitability of POMC neurons
Evidence from Studies
Supporting (1)
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TRPC1/5-CaV3 Complex Mediates Leptin-Induced Excitability in Hypothalamic Neurons
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