A major obstacle to the development of safer and more effective pain treatments is the poorly defined nature of the different pathways involved in chronic pain. The applicant team bring together a unique set of research expertise in using neurotoxins to define, at the molecular level, how the nervous system functions. The applicants also share a common interest in understanding and improving treatments for pain, especially chronic pain which continues to remain poorly managed Through a focus on ....A major obstacle to the development of safer and more effective pain treatments is the poorly defined nature of the different pathways involved in chronic pain. The applicant team bring together a unique set of research expertise in using neurotoxins to define, at the molecular level, how the nervous system functions. The applicants also share a common interest in understanding and improving treatments for pain, especially chronic pain which continues to remain poorly managed Through a focus on pain research, the Program will significantly enhance the scope of existing multidisciplinary collaborations between the Cis Lewis Alewood, Adams and Christie, which have already made a considerable impact in the fields of pharmacology and neuroscience. The CIs also have considerable experience in the development of pain therapeutics, having discovered two conopeptides now under commercial development with AMRAD (AM336) and Xenome Ltd (Xen2174). This Program will discover and use highly selective conopeptides such as these to dissect the pharmacology of peripheral pain pathways and their projections into the central nervous system, and to identify and characterise new targets amenable to drug intervention. The long-term goal of the Program is to discover new targets in pain pathways and develop conopeptides that act on these targets in animal models of chronic pain. These molecules will be optimised within the Program to the point where they can be considered for pre-clinical development in collaboration with commercial partners.Read moreRead less
Mechanism Of Signal Transduction And Receptor Activation In Ligand Gated Ion Channel Receptors
Funder
National Health and Medical Research Council
Funding Amount
$456,000.00
Summary
This project seeks to provide fundamental new information about the means by which neurotransmitter receptors, which mediate fast synaptic neurotransmission, operate. It will use a range of molecular advances made by this and other laboratories to clarify how neurotransmitters enable their receptors to activate and signal. This fundamental information is of major medical significance as defective synaptic transmission, caused by mutations in ligand gated ion channel receptors, give rise to a num ....This project seeks to provide fundamental new information about the means by which neurotransmitter receptors, which mediate fast synaptic neurotransmission, operate. It will use a range of molecular advances made by this and other laboratories to clarify how neurotransmitters enable their receptors to activate and signal. This fundamental information is of major medical significance as defective synaptic transmission, caused by mutations in ligand gated ion channel receptors, give rise to a number of neurological and psychiatric disease states. The ligand gated receptors are also major targets for therapeutic drugs and the information gained in this study may also provide insights into new ways in which drugs could be used to enhance or inhibit synaptic signalling.Read moreRead less
Molecular Determinants Of Inhibitory Synaptic Function Studied Using Mutant And Transgenic Mice
Funder
National Health and Medical Research Council
Funding Amount
$496,500.00
Summary
Communication between nerve cells is the key to effective brain function and when disturbed, pathological states such as epilepsy, schizophrenia, fear and anxiety, spasticity and motor disorders ensue. This project is based on new data which suggests that the site of this communication, called the synapse, is a much more dynamic structure than previously thought. Based on our work to date, where we have demonstrated the recruitment of selected classes of neurotransmitter receptors into synapses, ....Communication between nerve cells is the key to effective brain function and when disturbed, pathological states such as epilepsy, schizophrenia, fear and anxiety, spasticity and motor disorders ensue. This project is based on new data which suggests that the site of this communication, called the synapse, is a much more dynamic structure than previously thought. Based on our work to date, where we have demonstrated the recruitment of selected classes of neurotransmitter receptors into synapses, our aim is to use a range of naturally occuring mice mutants, as well as transgenic mice to modulate the receptor levels and so to examine the role of synaptic function and synaptic dynamics. The outcomes of this project will provide fundamental new knnowledge aimed at understanding how communication in the nervous system works and may suggest ways in which modulation of this information flow could be used to treat disorders of brain function.Read moreRead less
The Contribution Of Subunit Interfaces To Receptor Activation In Ligand Gated Ion Channels
Funder
National Health and Medical Research Council
Funding Amount
$309,070.00
Summary
This project seeks to provide insights into new mechanisms that could be used to enhance or inhibit neuronal signalling. The family of pentameric neurotransmitter receptors that are key components in the process of neuronal signalling and are the target of this study. It will investigate the molecular motions that occur when the receptor shifts from the resting state to the activated state in the presence of neurotransmitter. This critical to understanding the normal function of these receptors ....This project seeks to provide insights into new mechanisms that could be used to enhance or inhibit neuronal signalling. The family of pentameric neurotransmitter receptors that are key components in the process of neuronal signalling and are the target of this study. It will investigate the molecular motions that occur when the receptor shifts from the resting state to the activated state in the presence of neurotransmitter. This critical to understanding the normal function of these receptors in the brain and how they can be modulated.Read moreRead less
Delta-containing GABA-A Receptors As Targets For Neuroprotection
Funder
National Health and Medical Research Council
Funding Amount
$953,825.00
Summary
After stroke, the neurotransmitter, GABA spills onto sites located away from the synapse. This spillover is hypothesised to have a protective role in limiting cell death. However the timeframe for this to occur is too long for observing significant beneficial effects after stroke. Therefore, stimulating this naturally occurring protective mechanism early using pharmaceutical interventions that target a specific type of GABAA receptor is an unexplored strategy to minimize cell death after stroke.
The Alpha5 GABA-A Receptor: Delineating An Emerging Therapeutic Target
Funder
National Health and Medical Research Council
Funding Amount
$481,178.00
Summary
GABA-A receptors mediate inhibitory synaptic transmission in the brain. Receptors containing ?5 subunits are therapeutic targets for many neurological disorders. We aim to characterise the functional properties of the main ?5-containing isoforms using high-resolution imaging and whole-cell recording. Our goal is to understand which ?5-containing isoform should be preferentially targeted (and how) when seeking to treat the various disorders in which these receptors have been implicated.
?4-containing GABA-A Receptors As Targets For ?-hydroxybutyric Acid (GHB)
Funder
National Health and Medical Research Council
Funding Amount
$610,572.00
Summary
?-Hydroxybutyric acid (GHB) is an elusive substance. On one hand, it is a prescribed drug to treat narcolepsy, and ameliorate alcohol withdrawal. On the other hand, GHB is the club drug “Fantasy” or “Liquid Ecstasy”, taken by many Australians for its social, sexual and euphoric effects. This proposal will identify GHB targets and provide insight to its mechanism of action.
Structure-function Studies Of Ion Permeation And Selectivity In Recombinant Glycine Receptor Channels
Funder
National Health and Medical Research Council
Funding Amount
$331,300.00
Summary
Ligand-gated ion channels (LGICs) are members of a superfamily of receptor channels, with very significant structural and functional similarities, which play a major role in fast synaptic neurotransmission within the brain and spinal cord, and underlying the complex behaviour of the nervous system, but when dysfunctional can result in major neurological problems. Glycine is one of the two most important inhibitory neurotransmitters in the central nervous system. Impaired glycine-mediated neurotr ....Ligand-gated ion channels (LGICs) are members of a superfamily of receptor channels, with very significant structural and functional similarities, which play a major role in fast synaptic neurotransmission within the brain and spinal cord, and underlying the complex behaviour of the nervous system, but when dysfunctional can result in major neurological problems. Glycine is one of the two most important inhibitory neurotransmitters in the central nervous system. Impaired glycine-mediated neurotransmission underlies a range of inherited neurological diseases and already, it has been shown that the human disorder, familial Startle disease (hyperekplexia) occurs because of point mutations that have impaired the permeation and activation of the glycine receptor (GlyR). Similarly, certain epilepsies are now known to be caused by mutations in, or close to, the channel region in the excitatory acetylcholine receptors (AChRs), which affect channel activation and ion permeation. However, because of their very significant structural and functional similarities, information obtained in one member of the LGIC family of receptors has strong potential application to the other members and the GlyR with its simpler structure has certain advantages for investigation. The first aim of this project is to investigate how the molecular biological structure of these ion channels controls permeation, how it affects how different ions are selectively allowed to move through it and how it affects channel activation. A second related aim is to learn more about the process of desensitization of GlyR receptors, whereby a sustained presence of a high concentration of agonist can cause a reduction in receptor response. A third aim is to specifically investigate the mechanisms underlying the mode of molecular disruption resulting from two new Startle disease mutations, which, in addition to their own inherent clinical value, can also give general information about receptor function.Read moreRead less
How Do Anaesthetics Work? A Rational Basis For Safer General Anaesthesia.
Funder
National Health and Medical Research Council
Funding Amount
$592,008.00
Summary
General anaesthetics are a mainstay of modern medicine, but have a small safety margin, requiring skilled anaesthetists for their safe use. There is growing evidence that general anaesthetic exposure may have long-term effects on brain function in both newborns and the elderly. This project will provide a detailed molecular description of anaesthetic action and specificity. It will provide the basis for designing new anaesthetics that are safer, both immediately and for long-term brain function.