Leptin and insulin engage specific PI3K subunits in hypothalamic SF1 neurons

Jong Woo Sohn, Youjin Oh, Ki Woo Kim, Syann Lee, Kevin W. Williams, Joel K. Elmquist

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Objective The ventromedial hypothalamic nucleus (VMH) regulates energy balance and glucose homeostasis. Leptin and insulin exert metabolic effects via their cognate receptors expressed by the steroidogenic factor 1 (SF1) neurons within the VMH. However, detailed cellular mechanisms involved in the regulation of these neurons by leptin and insulin remain to be identified. Methods We utilized genetically-modified mouse models and performed patch-clamp electrophysiology experiments to resolve this issue. Results We identified distinct populations of leptin-activated and leptin-inhibited SF1 neurons. In contrast, insulin uniformly inhibited SF1 neurons. Notably, we found that leptin-activated, leptin-inhibited, and insulin-inhibited SF1 neurons are distinct subpopulations within the VMH. Leptin depolarization of SF1 neuron also required the PI3K p110β catalytic subunit. This effect was mediated by the putative transient receptor potential C (TRPC) channel. On the other hand, hyperpolarizing responses of SF1 neurons by leptin and insulin required either of the p110α or p110β catalytic subunits, and were mediated by the putative ATP-sensitive K+ (KATP) channel. Conclusions Our results demonstrate that specific PI3K catalytic subunits are responsible for the acute effects of leptin and insulin on VMH SF1 neurons, and provide insights into the cellular mechanisms of leptin and insulin action on VMH SF1 neurons that regulate energy balance and glucose homeostasis.

Original languageEnglish (US)
Pages (from-to)669-679
Number of pages11
JournalMolecular Metabolism
Volume5
Issue number8
DOIs
StatePublished - Aug 1 2016

Fingerprint

Steroidogenic Factor 1
Leptin
Phosphatidylinositol 3-Kinases
Ventromedial Hypothalamic Nucleus
Insulin
Neurons
Catalytic Domain
Homeostasis
Transient Receptor Potential Channels
Glucose
KATP Channels
Electrophysiology
Adenosine Triphosphate

Keywords

  • Cellular mechanism
  • Conditional knockout mouse
  • Functional heterogeneity
  • Homeostasis
  • Patch clamp technique

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

Cite this

Leptin and insulin engage specific PI3K subunits in hypothalamic SF1 neurons. / Sohn, Jong Woo; Oh, Youjin; Kim, Ki Woo; Lee, Syann; Williams, Kevin W.; Elmquist, Joel K.

In: Molecular Metabolism, Vol. 5, No. 8, 01.08.2016, p. 669-679.

Research output: Contribution to journalArticle

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AU - Elmquist, Joel K.

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N2 - Objective The ventromedial hypothalamic nucleus (VMH) regulates energy balance and glucose homeostasis. Leptin and insulin exert metabolic effects via their cognate receptors expressed by the steroidogenic factor 1 (SF1) neurons within the VMH. However, detailed cellular mechanisms involved in the regulation of these neurons by leptin and insulin remain to be identified. Methods We utilized genetically-modified mouse models and performed patch-clamp electrophysiology experiments to resolve this issue. Results We identified distinct populations of leptin-activated and leptin-inhibited SF1 neurons. In contrast, insulin uniformly inhibited SF1 neurons. Notably, we found that leptin-activated, leptin-inhibited, and insulin-inhibited SF1 neurons are distinct subpopulations within the VMH. Leptin depolarization of SF1 neuron also required the PI3K p110β catalytic subunit. This effect was mediated by the putative transient receptor potential C (TRPC) channel. On the other hand, hyperpolarizing responses of SF1 neurons by leptin and insulin required either of the p110α or p110β catalytic subunits, and were mediated by the putative ATP-sensitive K+ (KATP) channel. Conclusions Our results demonstrate that specific PI3K catalytic subunits are responsible for the acute effects of leptin and insulin on VMH SF1 neurons, and provide insights into the cellular mechanisms of leptin and insulin action on VMH SF1 neurons that regulate energy balance and glucose homeostasis.

AB - Objective The ventromedial hypothalamic nucleus (VMH) regulates energy balance and glucose homeostasis. Leptin and insulin exert metabolic effects via their cognate receptors expressed by the steroidogenic factor 1 (SF1) neurons within the VMH. However, detailed cellular mechanisms involved in the regulation of these neurons by leptin and insulin remain to be identified. Methods We utilized genetically-modified mouse models and performed patch-clamp electrophysiology experiments to resolve this issue. Results We identified distinct populations of leptin-activated and leptin-inhibited SF1 neurons. In contrast, insulin uniformly inhibited SF1 neurons. Notably, we found that leptin-activated, leptin-inhibited, and insulin-inhibited SF1 neurons are distinct subpopulations within the VMH. Leptin depolarization of SF1 neuron also required the PI3K p110β catalytic subunit. This effect was mediated by the putative transient receptor potential C (TRPC) channel. On the other hand, hyperpolarizing responses of SF1 neurons by leptin and insulin required either of the p110α or p110β catalytic subunits, and were mediated by the putative ATP-sensitive K+ (KATP) channel. Conclusions Our results demonstrate that specific PI3K catalytic subunits are responsible for the acute effects of leptin and insulin on VMH SF1 neurons, and provide insights into the cellular mechanisms of leptin and insulin action on VMH SF1 neurons that regulate energy balance and glucose homeostasis.

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