Vasomotor Ganglionic Transmission: The Preganglionic Peptide And The Second Gear
Funder
National Health and Medical Research Council
Funding Amount
$451,896.00
Summary
Blood pressure depends on nerve signals that travel from the central nervous system to blood vessels. In the middle of this pathway is a relay station - the sympathetic ganglion cell. Transmission through this relay station has recently been shown to have not only a fixed but also a variable component - the 'second gear'. The project tests if and how three likely candidate peptide molecules, one in the nerves, two in the bloodstream, control this 'second gear' and hence regulate blood pressure.
Mechanisms And Consequences Of Renal Denervation In Chronic Kidney Disease
Funder
National Health and Medical Research Council
Funding Amount
$1,289,105.00
Summary
Chronic kidney disease (CKD) affects ~10-12% of the adult population and is associated with increased mortality. Activation of sympathetic nerves plays an important role in this scenario. We have pioneered a novel catheter-based approach using radiofrequency-energy to disrupt these nerves and we now aim to assess the mechanisms and consequences of applying this novel technology in patients with chronic kidney disease.
Mechanisms Controlling Sympathetic Nerve Activity To The Heart
Funder
National Health and Medical Research Council
Funding Amount
$101,220.00
Summary
In heart failure there is a large increase in sympathetic nerve activity to the heart and the kidney that has detrimental effects which is related to mortality in patients. The areas in the brain causing the increased nerve activity to the heart are unknown. We will investigate the role of two key brain areas in mediating this increase. In addition we will also focus on local mechanisms that are responsible for the increase in noradrenaline spillover.
Role Of The Area Postrema In Determining The Increased Cardiac Sympathetic Nerve Activity In Heart Failure
Funder
National Health and Medical Research Council
Funding Amount
$489,912.00
Summary
In heart failure there is a large increase in sympathetic nerve activity to the heart that has detrimental effects on the heart and can induce sudden death. The areas in the brain causing the increased nerve activity are unknown. We will investigate the role of the area postrema, which is a window to the brain for hormones in the blood. We have evidence that this brain site maintains the high level of nerve activity in heart failure, possibly stimulated by hormones circulating in the blood.
As Director of Research in the Department of Cardiology, Prof Hare supervises a number of research groups, a major one being a “Psychosocial” research group, others including a “wet “ vascular laboratory, a clinical cardio-vascular laboratory, an exercise research group and a clinical trials group primarily working in heart failure.
Stress and obesity can lead to high blood pressure and greatly increase the risk of life threatening cardiovascular events. This application seeks to determine which chemicals and parts of the brain are responsible for amplifying the responses to repeated stress and during obesity in animal models leading to hypertension.
Does Renal Afferent Nerve Activation Contribute To Cardiac Sympathoexcitation And Decreased Renal Function In Heart Failure?
Funder
National Health and Medical Research Council
Funding Amount
$311,860.00
Summary
Removal of the nerves sending information between the kidneys and the brain reduces blood pressure in hypertensive patients. There is intense interest in the use of this procedure in heart failure patients, as it may reduce the harmful high level of nerve activity from the brain to the heart and kidneys. Using an experimental model of heart failure, I will determine whether this approach is beneficial in heart failure and its mechanisms of action.
What Central Mechanisms Increase Cardiac Sympathetic Nerve Activity In Heart Failure?
Funder
National Health and Medical Research Council
Funding Amount
$401,389.00
Summary
Heart failure is a disabling and deadly syndrome that has reached epidemic proportions in western populations. In heart failure, the activity of the sympathetic nerves to the heart is dramatically increased, leading to development of arrhythmias and sudden death. Using our unique model of heart failure, in which we directly record cardiac sympathetic nerve activity, we aim to determine the mechanisms in the brain that cause this large, detrimental increase in nerve activity.
Understanding The Role Of Supracollicular Nuclei In The Generation Of Basal Sympathetic Vasomotor Tone.
Funder
National Health and Medical Research Council
Funding Amount
$238,500.00
Summary
Increased activity from the parts of the brain which regulate blood pressure is observed in patients with cardiovascular diseases, including high blood pressure and heart failure. In some cases this increased activity might actually cause the high blood pressure. In all cases this increased activity can lead to serious complications including arrhythmias of the heart, enlargement of the heart and blood vessels, and even sudden cardiac death. This project aims to understand in more detail the par ....Increased activity from the parts of the brain which regulate blood pressure is observed in patients with cardiovascular diseases, including high blood pressure and heart failure. In some cases this increased activity might actually cause the high blood pressure. In all cases this increased activity can lead to serious complications including arrhythmias of the heart, enlargement of the heart and blood vessels, and even sudden cardiac death. This project aims to understand in more detail the parts of the brain that generate this activity. This information will enable more selective and effective treatments to be developed for people with high blood pressure or heart failure.Read moreRead less