Insulin-mediated regulation of adipocyte lipolysis

Summary

Insulin, a hormone that is released after a meal, regulates many aspects of metabolism including a process called lipolysis that involves the release of fatty acids into the circulation. Insulin suppresses the release of fatty acids from the fat tissue and while dysregulation of this process can markedly impact whole body metabolism, it is not well understood how insulin regulates this process. Here we will shed light on the mechanism by which insulin regulates lipolysis.

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Supervisor(s)

Professor David James

Research Location

School of Life and Environmental Sciences

Program Type

PHD

Synopsis

Non-alcoholic hepatosteatosis is a major problem worldwide inspiring much interest in the molecular control of lipid homeostasis particularly in liver. However, there is an emerging interest in the role of fat cell lipolysis. In insulin resistance, fat cell lipolysis is hyper-activated and this not only provides excess fatty acids for ectopic accumulation in the liver but this also plays a major role in regulating hepatic glucose output, another major defect in pre-diabetes. Despite this, the mechanism by which insulin regulates lipolysis is poorly understood. It was thought that insulin stimulated Akt activity in adipocytes leads to phosphorylation and inhibition of the phosphodiesterase PDE3B thus suppressing lipolysis. However, this mechanism has been challenged. We have recently identified a novel regulator of lipolysis, the abhydrolase domain containing protein ABHD15 that forms a complex with PDE3B. In the absence of ABHD15 insulin is unable to suppress lipolysis in vitro and in vivo. We hypothesise that the ABHD15/PDE3B complex is crucial for insulin regulation of lipolysis and we will define the mechanism in Aim 1 using our established adipocyte cell lines expressing functional and non-functional ABHD15 mutants. In Aim 2 we will solve the structure of the ABHD15/PDE3B complex using a cryo-electron microscopy approach. This project will not only unravel the mechanism of this important insulin regulated process but possibly also provide putative drug targets for combatting obesity and metabolic disease.

Additional Information

A complimentary scholarship for this project may be available through a competitive process. To find out more, contact Professor David James directly.

HDR Inherent Requirements
In addition to the academic requirements set out in the Science Postgraduate Handbook, you may be required to satisfy a number of inherent requirements to complete this degree. Examples of inherent requirements may include:

  • Confidential disclosure and registration of a disability that may hinder your performance in your degree;
  • Confidential disclosure of a pre-existing or current medical condition that may hinder your performance in your degree (e.g. heart disease, pace-maker, significant immune suppression, diabetes, vertigo, etc.);
  • Ability to perform independently and/or with minimal supervision;
  • Ability to undertake certain physical tasks (e.g. heavy lifting);
  • Ability to undertake observatory, sensory and communication tasks;
  • Ability to spend time at remote sites (e.g. One Tree Island, Narrabri and Camden);
  • Ability to work in confined spaces or at heights; Ability to operate heavy machinery (e.g. farming equipment);
  • Hold or acquire an Australian driver’s licence;
  • Hold a current scuba diving license;
  • Hold a current Working with Children Check;
  • Meet initial and ongoing immunisation requirements (e.g. Q-Fever, Vaccinia virus, Hepatitis, etc.)
You must consult with your nominated supervisor regarding any identified inherent requirements before completing your application.

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Keywords

insulin, lipolysis, metabolism, fat, Biochemistry, hepatosteatosis, Liver, International, scholarship

Opportunity ID

The opportunity ID for this research opportunity is: 2763

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