Surveillance Of LGV Chlamydia Trachomatis Types Among Men Who Have Sex With Men (MSM)
Funder
National Health and Medical Research Council
Funding Amount
$194,875.00
Summary
Chlamydia is a common sexually transmitted infection (STI) caused by the bacterium, Chlamydia trachomatis (CT). Annually, 50 million new cases of chlamydia are estimated to occur worldwide which if untreated, can lead to serious complications such as pelvic inflammatory disease and infertility in women and epididymitis in men. Over the past decade, there has been a sharp increase in diagnoses of chlamydia in Australia, coinciding with a reported upsurge in sexual risk behaviour (increased partne ....Chlamydia is a common sexually transmitted infection (STI) caused by the bacterium, Chlamydia trachomatis (CT). Annually, 50 million new cases of chlamydia are estimated to occur worldwide which if untreated, can lead to serious complications such as pelvic inflammatory disease and infertility in women and epididymitis in men. Over the past decade, there has been a sharp increase in diagnoses of chlamydia in Australia, coinciding with a reported upsurge in sexual risk behaviour (increased partner numbers and-or practices of unprotected sex), particularly among men who have sex with men (MSM). In addition, there are current outbreaks of an invasive CT strain, causing lymphogranuloma venereum (LGV), throughout Western Europe, with cases now reported in the USA. LGV can lead to severe anogenital ulcers, which can increase transmission of HIV, hepatitis C, and other STIs. With growing international travel, the likelihood of LGV outbreaks in Australia, particularly in MSM, is increased. Recently, isolated cases of LGV have been noted in MSM attending Sydney and Melbourne Sexual Health Centres, indicating LGV is possibly already in circulation. Since we know little about circulating CT types in Australia it would be difficult to assess the burden of an LGV outbreak. Due to increasing CT infections and likely risk of increased HIV transmission, particularly with LGV strains, surveillance of CT genotypes in Australia, especially in MSM, is important. The purpose of this study is to type CT strains in our population by looking at their genetic makeup. CT-positive specimens from Melbourne and Sydney will be used to identify CT types in circulation and to assess if LGV types are present. The knowledge obtained from this study will be novel and invaluable, and could contribute considerably to the development of improved disease prevention and intervention strategies, including the design of vaccines.Read moreRead less
Antagonist Of Corticotrophin Releasing Hormone As Therapeutic Agents For The Prevention Of Premature Birth In Humans
Funder
National Health and Medical Research Council
Funding Amount
$376,650.00
Summary
In developed countries the most common cause of the death of a newborn baby is premature delivery. Pre-term delivery remains the greatest cause of neonatal mortality in the western world and a major consumer of health dollars (approx. $5-7B per year in the US alone). However, a delay in the onset of labour from 20 to 25 weeks has been shown to result in a 55% greater probability of infant survival (550 fewer deaths per 1000). This project will allow: The development of new drugs that will allow ....In developed countries the most common cause of the death of a newborn baby is premature delivery. Pre-term delivery remains the greatest cause of neonatal mortality in the western world and a major consumer of health dollars (approx. $5-7B per year in the US alone). However, a delay in the onset of labour from 20 to 25 weeks has been shown to result in a 55% greater probability of infant survival (550 fewer deaths per 1000). This project will allow: The development of new drugs that will allow the extension of pregnancy term The development of protocols that will in turn reduce neonatal mortality. Additionally we believe that these new agents will be useful in preventing the onset of labour after fetal surgery. Currently there are no effective treatments capable of substantially changing delivery dates. Available therapeutics delay the onset of labour, at best, 24 hours. However, recent exciting results from our laboratories show that rising concentrations of the placental peptide Corticotrophin Releasing Hormone (CRH) are associated with the onset of labour. Further, we have also delayed the onset of labour in pregnant sheep by infusing a relatively insoluble CRH antagonist into the sheep fetus. Labour commenced ONLY AFTER the drug was withdrawn from the mother. This project builds upon an interdisciplinary team: medicinal chemists, molecular modellers, pharmacologists and endocrinologists, to further develop an exciting Australian discovery. Successful completeion of this research will, for the first time, allow the control of pregnancy duration MAXIMISING the benefits to mother and child, reducing mortality and later life morbidities typically associated with premature birth.Read moreRead less
Can Skin Infection With Group A Streptococcus Cause Acute Rheumatic Fever?
Funder
National Health and Medical Research Council
Funding Amount
$459,450.00
Summary
It is traditionally taught that the cause of acute rheumatic fever (ARF) is always infection of the throat with the bacterium group A streptococcus (GAS). However, in Aboriginal communities of the Top End of the Northern Territory the incidence of ARF is the highest reported in the world, yet GAS is uncommonly isolated from the throat. There is further information to suggest that GAS skin sores may underlie many cases of ARF. If this were proven, it would completely alter the traditional view of ....It is traditionally taught that the cause of acute rheumatic fever (ARF) is always infection of the throat with the bacterium group A streptococcus (GAS). However, in Aboriginal communities of the Top End of the Northern Territory the incidence of ARF is the highest reported in the world, yet GAS is uncommonly isolated from the throat. There is further information to suggest that GAS skin sores may underlie many cases of ARF. If this were proven, it would completely alter the traditional view of the cause of ARF, and have important implications for prevention of ARF around the world. Presently, these approaches focus on diagnosing and treating sore throat, but no country has proven that such a program can be successful in substantially reducing new cases of ARF. If it was known that skin infection could lead to ARF, then countries (including Australia) could emphasise the importance of skin health programs. A further benefit of this knowledge would be to influence GAS vaccine development, which presently is largely focused on the prevention of sore throat. A different possibility has recently been raised - that the cause of ARF may not always be GAS, but instead that the related bacteria GCS and GGS may have the potential to cause this disease. Proof of this hypothesis would even more dramatically alter our understanding of disease causation, prevention, and vaccine development. We propose to determine the cause of ARF in Aboriginal communities by regularly swabbing families of people with a history of ARF, and using genetic fingerprinting of the bacteria from the skin and throat swabs. When cases of ARF occur, we will be able to determine the site and type of infection that precipitated the attack. We will conduct a related study in more communities, in which we will swab family members of people with ARF and of control families (without ARF) to determine the bacteria most commonly isolated from ARF families.Read moreRead less
Increased Vulnerability To Stress During Opiate Dependence: Molecular, Anatomical, And Behavioural Correlates
Funder
National Health and Medical Research Council
Funding Amount
$272,640.00
Summary
Heroin addiction is a major health and societal problem in Australia. It is consistently associated with an adverse impact upon individual users, their families, and communities. It is a chronically relapsing condition for which few, if any effective prevention and treatment strategies exist. Moreover, why an individual initiates and maintains heroin taking remains unclear. Stress and negative emotions have a strong impact on heroin use. Stress may drive some individuals to start using heroin, s ....Heroin addiction is a major health and societal problem in Australia. It is consistently associated with an adverse impact upon individual users, their families, and communities. It is a chronically relapsing condition for which few, if any effective prevention and treatment strategies exist. Moreover, why an individual initiates and maintains heroin taking remains unclear. Stress and negative emotions have a strong impact on heroin use. Stress may drive some individuals to start using heroin, stress increases the pleasurable effects of heroin and stress increases the aversive effects of heroin withdrawal. These effects will encourage addiction and discourage addicts from seeking treatment. Stress can also cause an otherwise drug-free individual to relapse to heroin addiction despite having been drug-free for some time. In this project we will study why stress has such a large impact on heroin addicts and heroin addiction. We will test the hypothesis that heroin use actually produces profound alterations in the neural network in the brain which controls responses to stress. This project uses a simple animal model of heroin addiction whereby rats are injected with morphine to study the regulation of several genes which are important in responding to stress. We will also study how this exposure and changes in gene expression alter neurobiological, cardiovascular, and behavioural responses to stress. This project will identify parts of the brain that are altered during heroin addiction, and will also identify why heroin addicts are more vulnerable to stress than the general population. Therefore, this project will help us to identify targets for therapeutic intervention (both psychological and pharmacological) and possibly disrupt the addictive cycle.Read moreRead less
Glycine Transporters regulate the concentration of glycine in the spinal cord and brain. It has been suggested that elevating glycine levels in these regions may be useful in treating pain and schizophrenia. This project will provide the basis for the development of new glycine transport inhibitors that may be used to treat these conditions.
Mechanism Of Signal Transduction And Receptor Activation In Ligand Gated Ion Channel Receptors
Funder
National Health and Medical Research Council
Funding Amount
$551,560.00
Summary
This project seeks to provide fundamental new information about the means by which neurotransmitter receptors, which mediate fast synaptic neurotransmission, operate. This knowledge is important since the Cys-loop family of ligand gated ion channel receptors are responsible for a wide range of neuronal signalling and the control of both excitatory and inhibitory receptors. The Cys-loop receptors are modulated by both therapeutic drugs (eg. benzodiazepines, barbiturates, antiemetics) and by recre ....This project seeks to provide fundamental new information about the means by which neurotransmitter receptors, which mediate fast synaptic neurotransmission, operate. This knowledge is important since the Cys-loop family of ligand gated ion channel receptors are responsible for a wide range of neuronal signalling and the control of both excitatory and inhibitory receptors. The Cys-loop receptors are modulated by both therapeutic drugs (eg. benzodiazepines, barbiturates, antiemetics) and by recreational drugs (eg. alcohol, nicotine). They are also targets for development of new therapeutic drugs, such as allosteric modulators of nAChR for memory enhancement, or modulating GlyR to relieve spasticity or chronic pain. The project 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, gives 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
Invasive fungal infections are a serious, escalating health issue. They cause severe disease with high death rates and are very costly to the health system. Current drugs often have suboptimal efficacy and cause side effects. New drugs are needed urgently. Many fungi, including the AIDS-related pathogen, Cryptococcus neoformans, secrete phospholipase B (Plbp) to facilitate infection. We will identify and investigate the Plbp secretion pathway as a novel anti-fungal drug target.