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I am a reproductive physiologist investigating the nature and actions of hormones, particularly steroids and transforming growth factor-? superfamily members, regulating follicle growth and oocyte quality in the ovary, implantation and breakthrough bleedi
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
Manipulating Ovarian Follicle - Oocyte Communication To Control Reproductive Outcomes
Funder
National Health and Medical Research Council
Funding Amount
$567,424.00
Summary
Ovarian follicles provide the environment supporting oocyte (egg) development. Communication between cells of the follicle and oocytes modulate this environment. We discovered new cell surface molecules that receive the signals from the oocyte and we identified a class of drug compounds that can modulate this signalling. This discovery offers a unique potential to therapeutically intervene in this signalling process and both improve infertility therapies and develop new non-steroidal contracepti ....Ovarian follicles provide the environment supporting oocyte (egg) development. Communication between cells of the follicle and oocytes modulate this environment. We discovered new cell surface molecules that receive the signals from the oocyte and we identified a class of drug compounds that can modulate this signalling. This discovery offers a unique potential to therapeutically intervene in this signalling process and both improve infertility therapies and develop new non-steroidal contraceptives.Read moreRead less
Much of our current knowledge on development of external genitalia (ExG), the penis and clitoris, comes from 20 &70 year-old studies (1); but with significant developments in contemporary imaging and new mouse models, we have new data. The overall goal of this project is to prove the hypothesis that penile and clitoral development is estrogen- (and androgen-) dependent and, to show that the administration of exogenous endocrine disrupting chemicals that alter the balance between estrogen and and ....Much of our current knowledge on development of external genitalia (ExG), the penis and clitoris, comes from 20 &70 year-old studies (1); but with significant developments in contemporary imaging and new mouse models, we have new data. The overall goal of this project is to prove the hypothesis that penile and clitoral development is estrogen- (and androgen-) dependent and, to show that the administration of exogenous endocrine disrupting chemicals that alter the balance between estrogen and androgen will disrupt ExG development.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
Modulation Of MicroRNA Activity In The Testis: A New Paradigm For Male Fertility?
Funder
National Health and Medical Research Council
Funding Amount
$419,170.00
Summary
Sperm production in the testis is driven by the reproductive hormones, follicle-stimulating hormone (FSH) and testosterone. In this grant, we will investigate how a new class of molecules, called microRNAs, act to transmit the signals from FSH and testosterone to the cellular machinery of the testis, particularly at junctions between cells. This information has the potential to impact on our understanding of the causes of male infertility.