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Androgen Receptor Activity In Normal And Abnormal Human Ovarian Function
Funder
National Health and Medical Research Council
Funding Amount
$416,696.00
Summary
Androgens are hormones normally associated with men, but women also produce androgens and they are essential for normal female health and reproduction. Imbalances in female androgen activity could account for approximately 50% of female infertility, but exactly how androgens behave in women is not well understood. Making too much androgen is the most common hormonal problem experienced by women in their reproductive years, and it affects the ovary in a way that can cause infertility. Women with ....Androgens are hormones normally associated with men, but women also produce androgens and they are essential for normal female health and reproduction. Imbalances in female androgen activity could account for approximately 50% of female infertility, but exactly how androgens behave in women is not well understood. Making too much androgen is the most common hormonal problem experienced by women in their reproductive years, and it affects the ovary in a way that can cause infertility. Women with this problem have polycystic ovary syndrome (PCOS). Gaining weight increases the chance of having problems with fertility and increases the risk of diabetes and heart problems in women with PCOS. The cause of PCOS is unknown, but it can occur in families, which indicates that some genetic factor is involved. On the other hand, the concept that some women do not produce enough androgen is only beginning to emerge and remains a controversial topic among medical experts. Part of the problem with this notion is that normal female androgen levels are very difficult to measure accurately, so no one can say for certain how much is too little. A recent scientific study in female mice indicates that poor androgen action causes infertility early in life because the ovary is ageing too quickly. A similar thing could possibly occur in women, but this has never been scientifically explored. However, we have some early evidence that shows abnormally low androgen levels in infertile women with signs of early aging in the ovary. Our study aims to understand the role that androgens play in normal and abnormal ovarian function. A large part of this study involves investigation of the androgen receptor, a molecule that controls what androgens can do inside body organs. We think that abnormal activity of this receptor will be involved in ovarian diseases that cause infertility in women. This understanding may lead to new means of diagnosing and treating infertility in women.Read moreRead less
P-glycoprotein: A New Player In The Placental Glucocorticoid Barrier
Funder
National Health and Medical Research Council
Funding Amount
$424,711.00
Summary
Adequate growth and development of the fetus are crucial for survival of the newborn. The placenta plays a central role in these processes, providing the fetus with appropriate nutrients and hormonal signals. The placenta also regulates the maternal-fetal passage of hormones, some of which have the capacity to limit fetal growth. These include glucocorticoid hormones from the mother's adrenal gland (eg cortisol) which are normally prevented from passing through the placenta to the fetus due to t ....Adequate growth and development of the fetus are crucial for survival of the newborn. The placenta plays a central role in these processes, providing the fetus with appropriate nutrients and hormonal signals. The placenta also regulates the maternal-fetal passage of hormones, some of which have the capacity to limit fetal growth. These include glucocorticoid hormones from the mother's adrenal gland (eg cortisol) which are normally prevented from passing through the placenta to the fetus due to the 'placental glucocorticoid barrier'. The primary focus of this proposal is the investigation of a potential new contributor to this barrier called P-glycoprotein (P-gp), recently shown to limit access of glucocorticoids to the brain. We propose that because the placenta expresses significant amounts of P-gp, it may help prevent maternal glucocorticoids from reaching the fetus and causing growth retardation. We will determine whether P-gp is a significant contributor to the placental glucocorticoid barrier, and measure how much P-gp is present in normal placentas throughout pregnancy. We will also assess whether there is less P-gp present in placentas of growth-retarded fetuses. Understanding how P-gp affects the passage of glucocorticoids across the placenta could help to treat certain cases of fetal growth retardation.Read moreRead less
Progesterone Receptor-mediated Coordination Of Oocyte-oviduct Communication During Ovulation
Funder
National Health and Medical Research Council
Funding Amount
$86,128.00
Summary
Infertility affects 1 in 6 couples, often due to failed release of an egg from the ovary. The hormone progesterone is essential for this process. Our goal is to determine how progesterone signals the egg to ensure its correct release into the oviduct where fertilization may occur. To identify these signals, experiments will analyse ovary cells and eggs of mice, including mice that do not respond to progesterone. The results will provide much needed information about female reproductive health.
Therapeutic Potential Of Transforming Growth Factor-beta Proteins For The Diagnosis And Treatment Of Female Infertility
Funder
National Health and Medical Research Council
Funding Amount
$942,961.00
Summary
We discovered and manufactured a growth factor produced uniquely by the egg. We named this growth factor cumulin. It is a powerful regulator of ovarian function and egg quality. This project will study the basic mechanisms of how cumulin works in the ovary. We will then develop an assay to measure it as a biomarker of human egg quality and quantity. New approaches in fertility preservation for cancer survivors will be developed using cumulin.
Prevention Of Placental Oxidative Stress And Inflammation By Dietary Omega-3 Fatty Acids
Funder
National Health and Medical Research Council
Funding Amount
$547,970.00
Summary
Several pregnancy disorders that result in low birthweight involve aberrant function of the placenta. In this project we will examine one of the key mechanisms underlying placental dysfunction, namely oxidative stress, and determine whether its adverse effects can be limited by supplementation with dietary omega 3 fatty acids. The outcomes of this project will help guide future clinical studies on the possible beneficial effects of omega-3 fatty acids in pregnancy.
Activation Of GDF9 Regulates Human Folliculogenesis
Funder
National Health and Medical Research Council
Funding Amount
$531,690.00
Summary
GDF9 is a key regulator of fertility in female mammals, as it controls the process of folliculogenesis. In this grant, we will demonstrate the importance of GDF9 in human folliculogenesis, determine the mechanisms that activate GDF9 and show why aberrant GDF9 activation leads to ovarian disorders. Collectively, the outcomes of this proposal will increase our understanding of the fundamental mechanisms that regulate ovarian folliculogenesis and provide new avenues to manipulate this process.