Novel Modes Of Regulating Serotonin 5HT2c Receptors.
Funder
National Health and Medical Research Council
Funding Amount
$457,267.00
Summary
The normal function of all living cells depends on how they respond to the multitude of physical and chemical stimuli to which they are constantly exposed. The majority of these stimuli acting on cells do so not by directly entering the cells, but rather by acting on specific types of receiver proteins on the cell's surface that are called receptors. The most important family of cell-surface receptors transmit their message to the inside of the cell by coupling to yet another type of protein kno ....The normal function of all living cells depends on how they respond to the multitude of physical and chemical stimuli to which they are constantly exposed. The majority of these stimuli acting on cells do so not by directly entering the cells, but rather by acting on specific types of receiver proteins on the cell's surface that are called receptors. The most important family of cell-surface receptors transmit their message to the inside of the cell by coupling to yet another type of protein known as a G protein, and are therefore commonly referred to as G protein-coupled receptors (or GPCRs). The current proposal focuses on a special family of GPCRs that mediate the actions of the neurochemical, serotonin (or 5HT), in the human brain. These serotonin GPCRs are major targets for antidepressant and antipsychotic medications, and also play a role in anxiety, migraine and the control of appetite. Despite the important role of serotonin GPCRs in health and disease, the mechanism of action of many drugs acting on these receptors remain unknown. Our project will specifically investigate novel molecular mechanisms associated with serotonin GPCR activity that may prove vital in understanding mechanisms of psychiatric illnesses, and how many psychiatric medicines actually work.Read moreRead less
Allosteric Regulation Of G Protein-coupled Receptors
Funder
National Health and Medical Research Council
Funding Amount
$509,017.00
Summary
The normal function of all living cells depends on how they respond to the multitude of physical and chemical stimuli to which they are constantly exposed. The majority of these stimuli acting on cells do so not by directly entering the cells, but rather by acting on specific types of receiver proteins on the cell's surface that are called receptors. The most important family of cell-surface receptors transmit their message to the inside of the cell by coupling to yet another type of protein kno ....The normal function of all living cells depends on how they respond to the multitude of physical and chemical stimuli to which they are constantly exposed. The majority of these stimuli acting on cells do so not by directly entering the cells, but rather by acting on specific types of receiver proteins on the cell's surface that are called receptors. The most important family of cell-surface receptors transmit their message to the inside of the cell by coupling to yet another type of protein known as a G protein, and are therefore commonly referred to as G protein-coupled receptors (or GPCRs). Aberrations in the normal function of these GPCRs have been implicated in a wide variety of disorders, including neuropsychiatric conditions, endocrine disorders, cardiovascular disease and many cancers. To date, the majority of drugs acting at GPCRs do so by binding to specific regions on these receptors. Although many breakthroughs in disease treatment have been achieved using this approach, there remain a number of acknowledged limitations, including lack of drug selectivity, toxicity and reduced responsiveness with prolonged therapy. Our current proposal focuses on targeting drugs to alternative regions of GPCRs that may overcome many of the limitations associated with current drug therapies. An understanding of the properties of these alternative drug binding sites, which will be investigated in our current grant, can lead to more effective treatments for a variety of diseases.Read moreRead less
Understanding Cell Signalling Mechanisms Activated By Relaxin Family Peptides: Targets With Therapeutic Potential
Funder
National Health and Medical Research Council
Funding Amount
$306,842.00
Summary
One of the most powerful ways that the activity of the cells that make up the tissues and organs of the body can be changed is by the interaction of chemicals with proteins called receptors located at the cell surface. The commonest type of receptor is called a G-protein coupled receptor as it is linked to mechanisms inside the cell by the G-proteins. These receptors are the most commonly targeted by pharmaceutical companies that wish to alter the responses of cells for therapeutic purposes and ....One of the most powerful ways that the activity of the cells that make up the tissues and organs of the body can be changed is by the interaction of chemicals with proteins called receptors located at the cell surface. The commonest type of receptor is called a G-protein coupled receptor as it is linked to mechanisms inside the cell by the G-proteins. These receptors are the most commonly targeted by pharmaceutical companies that wish to alter the responses of cells for therapeutic purposes and almost 2-3 of all drugs currently marketed work through these proteins. This project will examine the mechanisms whereby certain types of G-protein coupled receptor produce signals in cells and determine what are the critical areas of the receptor for these interactions. The receptors involved have been discovered only in the last 4 years and little is known of the ways these change the activity of cells. The substances acting on these receptors have potential for development as targets for drugs that have the potential to treat fibrosis which is a feature of many diseases including cardiac failure, kidney failure and lung disease.Read moreRead less
Understanding the mechanisms of class B GPCR-transducer coupling. Current effort in developing drugs targeting G protein-coupled receptors (GPCRs) often result in low success rate due to the lack of understanding of the complexity and the spatiotemporal control of receptor function. The research program aims to understand the molecular mechanisms of receptor/transducer selectivity. The proposal integrated multi-disciplinary approaches to provide a deeper understanding of how the receptor is acti ....Understanding the mechanisms of class B GPCR-transducer coupling. Current effort in developing drugs targeting G protein-coupled receptors (GPCRs) often result in low success rate due to the lack of understanding of the complexity and the spatiotemporal control of receptor function. The research program aims to understand the molecular mechanisms of receptor/transducer selectivity. The proposal integrated multi-disciplinary approaches to provide a deeper understanding of how the receptor is activated responding to different ligands. The anticipated outcome including an enhanced capacity for understanding the fundamental biology, a stronger national and international collaborations. This will provide significant benefits including expanded basic knowledge and improvements in drug development efficiency. Read moreRead less
The molecular basis for efficacy at G protein coupled receptors. This project aims to investigate the molecular steps underlying the relationship between sensing by signal-transmitting proteins on the cell surface called G protein-coupled receptors and cellular response. The project aims to build on studies that have sought to understand the primary, molecular basis for this cellular volume control. This project seeks to use these novel approaches to fill this knowledge gap, providing a deeper u ....The molecular basis for efficacy at G protein coupled receptors. This project aims to investigate the molecular steps underlying the relationship between sensing by signal-transmitting proteins on the cell surface called G protein-coupled receptors and cellular response. The project aims to build on studies that have sought to understand the primary, molecular basis for this cellular volume control. This project seeks to use these novel approaches to fill this knowledge gap, providing a deeper understanding of how physiology and medicines work. The project expects to expand fundamental understanding of signal transmission at this receptor class. This project will deliver benefits including expanded basic knowledge and a contribution to future improvements in drug development.Read moreRead less
Discovering novel allosteric probes of muscarinic acetylcholine receptors. This project aims at fostering novel approaches to selectively target vital receptors in the human body, the muscarinic acetylcholine receptors (mAChRs). By harnessing the design of receptor mutations, compounds synthesis and fluorescent imaging, the project expects to develop new pharmacological tools for a family of receptors essential for the life of all vertebrates. By enriching our understanding of this family of rec ....Discovering novel allosteric probes of muscarinic acetylcholine receptors. This project aims at fostering novel approaches to selectively target vital receptors in the human body, the muscarinic acetylcholine receptors (mAChRs). By harnessing the design of receptor mutations, compounds synthesis and fluorescent imaging, the project expects to develop new pharmacological tools for a family of receptors essential for the life of all vertebrates. By enriching our understanding of this family of receptor, the project expects to provide significant benefits to the research field by impacting on future drug discovery efforts, not only at mAChRs, but at other structurally related receptors.Read moreRead less
Targeted development of dual action antitumour and antiangiogenic agents using differential and functional proteomics. There is an enormous need to develop more effective and less toxic therapeutic approaches to reduce the social and economic burden of cancer. The recent identification of small molecules that can act by both destroying cancer cells and the blood vessels that carry nutrients to them has provided a unique opportunity to define the pathways involved in the action of these agents in ....Targeted development of dual action antitumour and antiangiogenic agents using differential and functional proteomics. There is an enormous need to develop more effective and less toxic therapeutic approaches to reduce the social and economic burden of cancer. The recent identification of small molecules that can act by both destroying cancer cells and the blood vessels that carry nutrients to them has provided a unique opportunity to define the pathways involved in the action of these agents in order to develop more potent drug analogues. Development of these molecules will involve a collaborative and multidisciplinary link with our industry partner and the use of frontier technologies that may lead to improved health and economic outcomes for Australia. Read moreRead less
Synthetic derivatives of capsaicin and gingerols as analgesics acting at the vanilloid receptor. This project aims to prepare alpha-hydroxyketones and gingerol derivatives acting at vanilloid (VR1) receptor with potential analgesic activity. These compounds will be tested for their ability to activate the VR1 receptor, desensitize the receptor and release neuropeptides associated with pain pathways. The development of these novel compounds will contribute towards understanding the mechanisms of ....Synthetic derivatives of capsaicin and gingerols as analgesics acting at the vanilloid receptor. This project aims to prepare alpha-hydroxyketones and gingerol derivatives acting at vanilloid (VR1) receptor with potential analgesic activity. These compounds will be tested for their ability to activate the VR1 receptor, desensitize the receptor and release neuropeptides associated with pain pathways. The development of these novel compounds will contribute towards understanding the mechanisms of VR1 receptor activation and provide information on how the VR1 receptor is regulated. We will determine and compare neurotoxicity of these compounds to capsaicin which is known to possess neurotoxic activity. The outcome of this project may result in effective agents for better pain management.
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Understanding endogenous allosteric modulators of G protein-coupled receptors. Major life science challenges include how chemicals outside cells signal to proteins inside, how this results in physiological responses, and how dysfunction of these processes leads to pathophysiology. Despite the critical importance of G protein-coupled receptors (GPCRs), much remains to be learned about their regulation by endogenous and synthetic molecules. This project aims to address this gap, by building on rec ....Understanding endogenous allosteric modulators of G protein-coupled receptors. Major life science challenges include how chemicals outside cells signal to proteins inside, how this results in physiological responses, and how dysfunction of these processes leads to pathophysiology. Despite the critical importance of G protein-coupled receptors (GPCRs), much remains to be learned about their regulation by endogenous and synthetic molecules. This project aims to address this gap, by building on recent ground-breaking studies that have been performed, by focusing on alternative binding sites of GPCRs called allosteric sites. The major hypothesis is that these allosteric sites are widespread across GPCRs because the body produces endogenous allosteric ligands that remain largely unidentified, but which can play vital roles in biology.Read moreRead less