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Heart-lung Interactions Determine Right Ventricular Function In The Perinatal Period.
Funder
National Health and Medical Research Council
Funding Amount
$421,980.00
Summary
Birth, and the ensuing stress of newborn life, requires the heart to dramatically increase its level of functioning. Understanding how this process occurs remains a key problem as the heart lacks any ability to increase its level of functioning immediately before birth. Failure to effect this increase in heart function promptly at birth has serious implications for the well being of the newborn and represents a major problem in newborn medicine. Of the 250,000 babies born each year in Australia, ....Birth, and the ensuing stress of newborn life, requires the heart to dramatically increase its level of functioning. Understanding how this process occurs remains a key problem as the heart lacks any ability to increase its level of functioning immediately before birth. Failure to effect this increase in heart function promptly at birth has serious implications for the well being of the newborn and represents a major problem in newborn medicine. Of the 250,000 babies born each year in Australia, as many as 5,000 require intensive care primarily for cardiorespiratory complications. Accurate diagnosis and effective treatment of these infants demands knowledge of the normal heart adaptations that accompany birth, adaptations that are critically linked to the way in which the heart and the lungs interact. This project investigates how interactions between the heart and the lungs determines heart function throughout life. By understanding this process we will provide essential information that will aid the diagnosis and treatment of sick neonates undergoing intensive care.Read moreRead less
Neuroactive Steroids In The Fetal Brain: Role In The Regulation Of Behaviour And Protection Against Hypoxia
Funder
National Health and Medical Research Council
Funding Amount
$65,685.00
Summary
The major breakdown products of the steroid hormone, progesterone, form a group of hormones termed neuroactive steroids. These steroids have major effects on the activity of the brain and influence behaviour in adult subjects. Changes in the production of steroids by the steroid producing glands influences neurosteroid levels in the adult brain. This in tern may cause behavioural and mood changes in adults, leading to conditions such as premenstrual stress and postnatal depression. In fetal life ....The major breakdown products of the steroid hormone, progesterone, form a group of hormones termed neuroactive steroids. These steroids have major effects on the activity of the brain and influence behaviour in adult subjects. Changes in the production of steroids by the steroid producing glands influences neurosteroid levels in the adult brain. This in tern may cause behavioural and mood changes in adults, leading to conditions such as premenstrual stress and postnatal depression. In fetal life, the placenta releases large amounts of these neuroactive steroids and high concentrations of these steroid are found in the fetal circulation. We have shown that these steroids suppress the activity of the fetal brain, suppress arousal and maintain the fetus in a sleep-like state during pregnancy. In this proposal we investigate the hypothesis that cells in the fetal brain modify the neuroactive steroid environment within the brain so as to suppress fetal brain activity further during times of stress and, therefore, protect the brain from damage caused by excessive excitation. These mechanisms may prevent brain injury due to placental insufficiency during pregnancy and asphyxia during birth. The augmentation of these natural processes may form the bases for treatment strategies to provide additional protection for the fetal brain in high-risk pregnancies.Read moreRead less
Essential Protective Role Of Neuroactive Steroids In The Fetal And Neonatal Brain.
Funder
National Health and Medical Research Council
Funding Amount
$422,036.00
Summary
Brain injury may occur during complicated pregnancies and at birth, as well as in neonates following preterm labour, and is a major problem in neonatal medicine. The consequent nerve cell death leads to ongoing neurological impairment which represents a major cost to the individual and to the community. Neuroactive steroids are hormones related to the steroid hormone progesterone that have been shown to have a major influence on nerve cell activity and nervous transmission. While these hormones ....Brain injury may occur during complicated pregnancies and at birth, as well as in neonates following preterm labour, and is a major problem in neonatal medicine. The consequent nerve cell death leads to ongoing neurological impairment which represents a major cost to the individual and to the community. Neuroactive steroids are hormones related to the steroid hormone progesterone that have been shown to have a major influence on nerve cell activity and nervous transmission. While these hormones influence mood and behaviour in adult subjects, they have an even more important role in the fetus which is exposed to high levels of steroids from the placenta. The fetus is very sensitive to these neuroactive steroids and we have shown that they suppress the activity of the fetal brain so as to maintain the fetus in a sleep-like state during pregnancy. Periods of low oxygen supply (hypoxia) to the fetus may occur during pregnancy, as well as result from asphyxia at birth, and may lead to excessive excitation of nerve cells resulting in nerve cell death. Steroid-induced suppression reduces excitation of nerve cells and results in the fetus being resistant to excessive excitation. In this proposal we investigate the hypothesis that cells in the fetal brain modify the neuroactive steroid environment within the brain so as to suppress fetal brain activity further during times of hypoxic stress and, therefore, further protect the brain from damage caused by excessive excitation. These mechanisms may prevent brain injury due to placental insufficiency during pregnancy, asphyxia during birth and in premature babies. We will investigate whether the supplementation of these processes by administering neuroactive steroids may provide additional nerve protection during high-risk periods during pregnancy. These studies may identify a new as yet unexploited group of natural compounds which may improve infant health without adverse actions on the mother or baby.Read moreRead less
Improving Outcomes For Premature Infants Through Effective Maintenance Of Systemic Blood Flow
Funder
National Health and Medical Research Council
Funding Amount
$789,383.00
Summary
Survival rates for preterm babies are increasing, but the rate of disability is still high. Preterm babies may experience inadequate blood flow to the brain, leading to longterm disability. The causes of low blood flow are not known and current treatments are ineffective in nearly half of cases. This study will confirm that low blood flow is the result of immaturity of the structure and-or control of the heart, and will test new treatments targeted to these systems in the baby.
Discovery Early Career Researcher Award - Grant ID: DE230101053
Funder
Australian Research Council
Funding Amount
$450,556.00
Summary
Influence of parent and educator feeding practices on child self-regulation. This project aims to be the first study to investigate whether children who experience consistent and responsive feeding practices both at home and in early childhood education and care have higher levels of self-regulation, optimal eating behaviour and diet quality. The project expects to develop simple and low-cost strategies that parents and educators can use at mealtimes to enhance child self-regulation. With one mi ....Influence of parent and educator feeding practices on child self-regulation. This project aims to be the first study to investigate whether children who experience consistent and responsive feeding practices both at home and in early childhood education and care have higher levels of self-regulation, optimal eating behaviour and diet quality. The project expects to develop simple and low-cost strategies that parents and educators can use at mealtimes to enhance child self-regulation. With one million Australian children in care during their parent’s working week, outcomes of this project have widespread benefits. Higher self-regulation improves a child's health and well-being and provides short- and long-term social and economic benefits including school readiness, academic achievement and workforce participation.Read moreRead less
Impact Of Chronic Intrauterine Inflammation On Neurodevelopmental & Physiological Responses To Fetal Hypoxia.
Funder
National Health and Medical Research Council
Funding Amount
$280,750.00
Summary
Careful examination of records from hundreds of pregnancies has indicated that low-grade infection or inflammation within the uterus during pregnancy is associated with an increase in the likelihood that the newborn baby will suffer from cerebral palsy. This strong association suggests that inflammation during pregnancy can cause damage to the developing baby's brain. Similar studies have also identified an association betwen events that result in a lack of oxygen supply to the developing brain ....Careful examination of records from hundreds of pregnancies has indicated that low-grade infection or inflammation within the uterus during pregnancy is associated with an increase in the likelihood that the newborn baby will suffer from cerebral palsy. This strong association suggests that inflammation during pregnancy can cause damage to the developing baby's brain. Similar studies have also identified an association betwen events that result in a lack of oxygen supply to the developing brain and cerebral palsy. However the studies that have identified these associations are incapable of determining the mechanisms by which these factors affect brain development. Even though inflammation during pregnancy is common, and is often associated with diseases after birth, experimental studies of the effects of this type of inflammation on the wellbeing of the unborn baby have not been performed. Our research group has developed a unique experimental model, using sheep, which is particularly suitable for determining how inflammation and a lack of oxygen may affect the unborn baby and cause brain damage. By continuously giving a sterile bacterial cell wall preparation (endotoxin) into the amniotic fluid of pregnant sheep we can cause prolonged inflammation with characteristics that are similar to those that accompany inflammation during human pregnancy but different to other models of inflammation within the uterus. We intend to use our model to determine how prolonged inflammation and a lack of oxygen affect the well-being of the developing lamb before birth and how these factors affect brain development. Our proposed study will provide valuable information about how inflammation and a lack of oxygen interact to affect brain development. We expect that when inflammation is present the fetus becomes more vulnerable to the effects of a lack of oxygen, resulting in more severe brain damage occuring than when either factor is experienced alone.Read moreRead less