Ghrelin Receptor Signaling In The Brain Links Hunger To Mood And Motivation
Funder
National Health and Medical Research Council
Funding Amount
$721,909.00
Summary
Cells in the brain that respond to hunger may also promote obsessive compulsive behaviours often associated with mental illness, such as anorexia nervosa. This grant examines how the signals from the body inform the brain of hunger. Specially we examine if overactivity of hunger cells, in the absence of appropriate food intake can increase behaviours associated with mental illness.
Transgenerational Impacts Of Paternal Stress On Offspring Mental Health: Epigenetic Mechanisms And Therapeutic Interventions
Funder
National Health and Medical Research Council
Funding Amount
$572,941.00
Summary
We are following up the extraordinary, almost ‘Lamarckian’, discovery that environmental influences on fathers can affect their offspring via ‘epigenetic’ changes to the sperm. We will explore mechanisms whereby increased levels of paternal stress can cause behavioural changes in the offspring, which are relevant to depression and anxiety disorders, and how positive environmental factors, including physical activity, may induce beneficial effects. This will have major public health implications.
A Novel Knockin Model To Test The Role Of Nicotine Acting On Alpha4 Acetylcholine Receptors In Complex Behaviours
Funder
National Health and Medical Research Council
Funding Amount
$581,315.00
Summary
Cigarette smoking is the single largest preventable cause of death and disease in Australia and worldwide. Nicotine contained in tobacco products acts on brain nicotine receptors, which plays an intrinsic role in addiction. One type of receptor for nicotine found in regions of the brain associated with drug-seeking behaviour is called alpha4 nicotinic receptors. We have made a mouse with a mutation in this nicotine receptor to study nicotine addiction and anxiety.
Neural Correlates Of Fear Conditioning And Extinction
Funder
National Health and Medical Research Council
Funding Amount
$901,899.00
Summary
The amygdala is a part of the brain that processes emotional information. Disorders of amygdala function lead to a host of anxiety-related disorders such as phobias and post-traumatic stress disorder. In this grant we will study how the amygdala processes sensory information from the environment and forms memories of salient events. These findings will tell us how memories are formed, stored and retrieved. In the long term it will provide targets for the development of new anxiolytic agents
THE NEUROBIOLOGICAL BASIS OF INDIVIDUAL DIFFERENCES IN SUSCEPTIBILITY TO THE CONSEQUENCES OF STRESS
Funder
National Health and Medical Research Council
Funding Amount
$583,875.00
Summary
Stress plays a major role in the development and progression of many different mental health disorders. However, as we all know, the effects of stress on one person can be very different from its effects upon another. This is at least partly explained by differences in individual coping styles. When faced with a stressful situation without a ready solution, people tend to divide into two broad camps: those with an innate tendency to adopt passive coping strategies, such as avoidance, and those t ....Stress plays a major role in the development and progression of many different mental health disorders. However, as we all know, the effects of stress on one person can be very different from its effects upon another. This is at least partly explained by differences in individual coping styles. When faced with a stressful situation without a ready solution, people tend to divide into two broad camps: those with an innate tendency to adopt passive coping strategies, such as avoidance, and those that tend towards active coping strategies, such as attempting to take control of the situation. Previous studies have provided findings that suggest that passive coping is more common amongst sufferers of depression, post-traumatic stress disorder, and chronic pain syndrome than is active coping. But is this cause, or effect? And what are the intervening brain mechanisms? We attempt to address such questions in the present project using an animal model in which social conflict has been shown to trigger depression-like symptoms. In particular we wish to: (i) determine whether the patterns of brain activity triggered by social conflict are different for active vs. passive copers; (ii) determine whether the depression-like consequences of social conflict are more severe in passive than in active copers; (iii) determine whether differences in coping style and vulnerability to social conflict stress are due to the actions of a particular neurotransmitter, dopamine, in the prefrontal cortex of the brain; (iv) determine whether the actions of antidepressants might be attributable changes in prefrontal cortex dopamine function which in turn promote active coping in preference to passive coping. These studies will provide exciting new information about the neurobiological basis of individual differences in vulnerability to the harmful effects of stress, and thus will offer the hope of developing new ways of preventing devastating illnesses such as depression.Read moreRead less
Excitatory Synaptic Circuitry And Plasticity In The Amygdala.
Funder
National Health and Medical Research Council
Funding Amount
$405,750.00
Summary
The amygdala is a key structure in the neuronal circuitry that underlies the analysis of emotional information. In particular this structure plays a major role in the processing of fear-related information. Disorders of the processing and storage of such information are thought to be the major underlying cause of mental disorders such as panic attacks, anxiety and post traumatic stress disorder. Understanding the physiology of this structure and the ways in which this can change in response to v ....The amygdala is a key structure in the neuronal circuitry that underlies the analysis of emotional information. In particular this structure plays a major role in the processing of fear-related information. Disorders of the processing and storage of such information are thought to be the major underlying cause of mental disorders such as panic attacks, anxiety and post traumatic stress disorder. Understanding the physiology of this structure and the ways in which this can change in response to various stimuli is necessary for the development of rational therapies that target the amygdala.Read moreRead less
Ascending Control Of Behavioural State And Cognition - Role Of Nucleus Incertus And Relaxin-3 Transmission
Funder
National Health and Medical Research Council
Funding Amount
$540,356.00
Summary
Mental illness and dementia are significant social and economic burdens worldwide and knowledge of their underlying causes and more effective therapies are required. Our research aims to use pre-clinical models to characterize a little studied neuronal network implicated in control of brain theta rhythm activity, which could lead to improved treatment of neuropsychiatric diseases such as anxiety and depression, and degenerative cognitive decline.
Inhibitory Neurotransmitter Receptors As Therapeutic Targets For Chronic Pain And Anxiety Disorders
Funder
National Health and Medical Research Council
Funding Amount
$763,409.00
Summary
There are currently few effective long-term treatments for chronic pain and anxiety disorders. Here we propose to develop innovative therapies for both of these debilitating neurological disorders. In addition, we plan to improve our current understanding of how these disorders occur in the first place. This may identify novel potential therapeutic strategies for treating pain, anxiety and a host of other neurological disorders.
Ecstasy, Methamphetamine And Their Combination: Assessment Of Adverse Effects
Funder
National Health and Medical Research Council
Funding Amount
$384,250.00
Summary
MDMA (Ecstasy) and Methamphetamine (METH) are popular party drugs that are frequently used by young Australians. Health problems associated with MDMA and METH use are (1) many people suffer complications arising from the high body temperature (hyperthermia) that these drugs produce, and (2) MDMA and METH may both cause long-term loss of key neurotransmitters in the brain. This effect on the brain may well lead to psychological problems such as anxiety, depression, increased impulsive behaviour a ....MDMA (Ecstasy) and Methamphetamine (METH) are popular party drugs that are frequently used by young Australians. Health problems associated with MDMA and METH use are (1) many people suffer complications arising from the high body temperature (hyperthermia) that these drugs produce, and (2) MDMA and METH may both cause long-term loss of key neurotransmitters in the brain. This effect on the brain may well lead to psychological problems such as anxiety, depression, increased impulsive behaviour and memory impairment. However the link between MDMA and METH use and subsequent brain damage is still very controversial. Recently, we have found that when MDMA and METH are combined, a particularly toxic effect is seen with very high body temperatures and lasting adverse effects on mood and brain function. This is a major cause for concern because of evidence that many Australian drug users are combining METH and MDMA on a regular basis. This project will investigate the short and long-term effects of MDMA, METH and METH-MDMA combinations. Phase 1 is aimed at investigating whether different doses of the drugs lead to lasting changes in mood, behaviour and brain function and to compare the relative toxicity of the three treatments. Phase 2 will determine whether lack of fluid intake, high environmental temperatures and advanced age are risk factors in determining the toxicity of MDMA and METH. Phase 3 will assess whether the toxicity of these drug treatments depends upon whether an animal takes the drugs voluntarily or whether they are injected with the drug by the experimenter. The final part of the project will use a wide variety of advanced techniques to track the brain damage caused by these drug treatments given under a range of conditions. The significance of this project will be in increasing our understanding of how MDMA and METH affect the brain and behaviour and how the harms posed by these drugs may be predicted and therefore minimised.Read moreRead less