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mechanistic
Analysis v3
History

In mouse brain cells called POMC neurons, blocking TRPC or T-type calcium channels stops leptin from making the cells more active, including preventing the decrease in the minimum current needed to...

12
Pro
0
Against

Mechanism

Synthesis from 1 study

How it works

Leptin turns on a pair of connected ion channels in brain cells that control hunger signals. The first channel lets in a small amount of charge, which flips on the second channel. Together, they push the cell to fire signals nonstop, telling the brain the body has had enough food.

Most probable mechanism

In Simple Terms

Leptin binds to receptors on specific brain cells, triggering a chain reaction that opens sodium and calcium channels. This opens nearby calcium channels that need a small voltage shift to activate. The combined flow of ions pushes the cell's voltage high enough to fire signals continuously, telling the brain the body is full.

Causal chain
1

Leptin binds to its receptor on hypothalamic POMC neurons

Verified by multiple studies
which leads to
2

Receptor activation triggers intracellular signaling that opens TRPC1/5 channels

Verified by multiple studies
which leads to
3

TRPC1/5 channels allow sodium and calcium influx, depolarizing the membrane by approximately 6 millivolts

Verified by multiple studies
which leads to
4

This depolarization shifts the membrane voltage into the activation range of adjacent T-type (CaV3.1/CaV3.2) calcium channels

Verified by multiple studies
which leads to
5

T-type calcium channels open due to increased open probability and reduced inactivation, allowing additional calcium influx

Verified by multiple studies
which leads to
6

Calcium entering through T-type channels creates a localized microdomain that further depolarizes the membrane to threshold

Verified by multiple studies
which leads to
7

Membrane depolarization triggers voltage-gated sodium channels to initiate action potentials

Verified by multiple studies
which leads to
8

TRPC1/5 and T-type calcium channels form a physical complex that enables coordinated, localized ion flux

Verified by multiple studies

Evidence from Studies

Supporting (1)

12

Community contributions welcome

12

TRPC1/5-CaV3 Complex Mediates Leptin-Induced Excitability in Hypothalamic Neurons

Case-Control Study
Animal & In Vitro
2021

Contradicting (0)

0

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No contradicting evidence found

Gold Standard Evidence Needed

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Source Study

TRPC1/5-CaV3 Complex Mediates Leptin-Induced Excitability in Hypothalamic Neurons

Score: 12
DOI: 10.3389/fnins.2021.679078

Similar Assertions

In mouse brain cells called POMC neurons, the hormone leptin triggers a sequence of ion channel activations that increases calcium influx and makes the cells fire electrical signals more readily.

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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 depolarize through activation of TRPC channels.

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In mice lacking the KLHL1 gene, blocking T-type calcium channels with a specific drug restores the ability of leptin to activate brain cells that control appetite, showing that excessive electrical activity in these cells—not a broken leptin receptor—causes leptin resistance.

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Blocking T-type calcium channels with a specific drug restores the response of POMC neurons to leptin in mice lacking the KLHL1 gene, showing that increased T-type calcium current directly causes leptin resistance in these animals.

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In mouse brain cells called POMC neurons, removing calcium ions with BAPTA blocks the increase in electrical activity caused by leptin, but removing calcium with EGTA does not. This shows that calcium entering near a specific protein complex is necessary for the sustained electrical response to leptin, but not for the initial electrical change.

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