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The maintenance of optimum health and function of living cells, and consequently that of the whole organism, depends on how cells respond to a multitude of physical and chemical stimuli that continually bombard them. The majority of the chemical stimuli such as hormones and neurotransmitters impart their actions not by directly entering the cell, but instead, by binding to a specific receiver protein at the cell surface called a receptor. In one class of such receptors called G protein coupled r ....The maintenance of optimum health and function of living cells, and consequently that of the whole organism, depends on how cells respond to a multitude of physical and chemical stimuli that continually bombard them. The majority of the chemical stimuli such as hormones and neurotransmitters impart their actions not by directly entering the cell, but instead, by binding to a specific receiver protein at the cell surface called a receptor. In one class of such receptors called G protein coupled receptors, the transmission of the message to the interior of the cell involves yet another protein called G protein. It is extremely important to unravel how each of these components, the stimulating agent, the receptor and G protein, works in order to understand how the cells respond to various chemical signals. To make this process even more complex, it was recently shown that another newly discovered group of proteins called receptor activity modifying proteins (RAMPs) too play a critical role in some systems. Understanding what actually is the role of these new players, and how they team-up with the other components to elicit a specific response to a chemical stimulus, forms the basis of this proposal. Such knowledge is central to the unraveling of the processes involved in the maintenance of health, abnormalities that lead to disease, and in the development of new treatments.Read moreRead less
This research will push the boundaries of current knowledge in receptor pharmacology and translate this knowledge into clinical outcomes. Receptors are proteins on the surface of our cells that bind hormones, neurotransmitters and pharmaceuticals. By better understanding the complexities of how these receptors work at the molecular level, the objective is to develop improved treatments and better clinical management for a range of medical conditions.
Spatial And Temporal Dimensions Of Mu-opioid Receptor Signalling: Implications For The Development Of Tolerance
Funder
National Health and Medical Research Council
Funding Amount
$799,316.00
Summary
The use of morphine as an analgesic is still limited by undesirable side effects such as tolerance. Despite decades of research, the mechanisms behind the development of tolerance are poorly understood. The ? opioid receptor is a protein expressed at the surface of the cells that is the target of morphine. This project will investigate the signalling events triggered by opioids with unprecedented resolution and will aim to elucidate why morphine elicits more tolerance than other opioid drugs.
The Structural Basis For Biased Agonism At The Glucagon-like Peptide-1 Receptor
Funder
National Health and Medical Research Council
Funding Amount
$872,536.00
Summary
The glucagon-like peptide-1 receptor plays an essential role in nutrient-regulated insulin release, and is a major target for therapeutic treatment of type 2 diabetes. The binding of different drugs to this receptor can promote distinct signalling profiles inside the cell that can lead to different physiological outcomes. Understanding the mechanistic basis for this will provide a framework to enable rational design of novel, better and safer therapeutics for the treatment of diabetes.
Understanding The Structural Basis For Family B G Protein-coupled Receptor Function
Funder
National Health and Medical Research Council
Funding Amount
$745,082.00
Summary
G protein-coupled receptors (GPCRs) are the largest family of cell surface proteins that enable communication from external signals to the inside of cells of the body. Family B GPCRs are a therapeutically important subclass of these receptors and they play crucial roles in bone and energy homeostasis, cardiovascular control and immune response. This grant will uncover fundamental knowledge on how these receptors work, and will enhance future development of therapeutics.
Mechanisms Of Ligand-Selective Signalling By Chemokine Receptors
Funder
National Health and Medical Research Council
Funding Amount
$749,428.00
Summary
Receptors are molecules located on the surfaces of cells. They control the response of one cell to chemical signals emitted by different cells. In this project we aim to characterise and understand the molecular details of how a receptor can respond differently to distinct chemical signals. The results of this study will help to guide future development of medicines to control white blood cell migration into tissues during inflammatory diseases such as heart disease, diabetes and arthritis.
The hormone angiotensin II (AngII) contributes broadly to the cardiovascular, endocrine, neural and metabolic systems. It binds to the angiotensin II type 1 (AT1) receptor and inappropriate activity leads to hypertension. Using a range of molecular and biophysical approaches and the angiotensin receptor as a model GPCR, we will study the role of the cell membrane in AT1 activation which may lead to new approaches for drug design.