Central Mechanisms Underlying Obesity Related Hypertension.
Funder
National Health and Medical Research Council
Funding Amount
$311,860.00
Summary
The prevalence of obesity and related disease are rising rapidly worldwide. Adult risk factors, genetic predisposition and socioeconomic factors all contribute to obesity and obesity related hypertension however there is compelling evidence that the early life environment also contributes to disease progression. In this regard, an understanding of how increased sympathetic activity occurs in programmed hypertension is required in order to develop effective therapeutic strategies.
How Intestinal Motility Activates Sensory Pathways
Funder
National Health and Medical Research Council
Funding Amount
$555,875.00
Summary
Pain and discomfort from the gut are common and unpleasant. We understand how gut sensory nerve cells work, at the cellular, molecular and genetic level. However, movement of the gut wall and contents are the major cause of activation of sensory neurons. We know little about which particular patterns of movement cause pain. This is crucial information for accurately diagnosing human gut disorders, for monitoring effectiveness of treatments and for identifying potential new drug targets.
I am a medically trained physiologist studying how the brain controls the delivery of oxygen to the body, the removal of carbon dioxide and the maintenance of normal acid level in the blood. This branch of physiology is well known to anyone who has studied 'ABC' in a first aid programme. My work concerns the coordination of the breathing and blood pressure centres in the brain. It is crucial in the understanding of diseases such as obstructive sleep apnoea and hypertension.
ORIGIN AND REGULATION OF VAGAL PREGANGLIONIC NEURON SUBTYPES CONTROLLING AIRWAY SMOOTH MUSCLE TONE
Funder
National Health and Medical Research Council
Funding Amount
$438,700.00
Summary
The primary role of the airways is to allow the exchange of oxygen and carbon dioxide between the environment and the lungs. However, the airways are not merely a series of static tubes, but rather their size (or caliber) is subject to breath-by-breath alterations, thereby regulating gas exchange to match the body's demands. Regulation of airway caliber is achieved largely by subconscious changes in the tone of the muscle lining the airway wall. Airway muscle tone is primarily under the control ....The primary role of the airways is to allow the exchange of oxygen and carbon dioxide between the environment and the lungs. However, the airways are not merely a series of static tubes, but rather their size (or caliber) is subject to breath-by-breath alterations, thereby regulating gas exchange to match the body's demands. Regulation of airway caliber is achieved largely by subconscious changes in the tone of the muscle lining the airway wall. Airway muscle tone is primarily under the control of the parasympathetic division of the autonomic nervous system. Two distinct types of parasympathetic nerves innervate the airways: One type employs the neurotransmitter acetylcholine which causes airway muscle to contract and the airways to constrict, while the other type employs nitric oxide which evokes airway dilatation. The normal regulation of airway caliber is altered in a variety of inflammatory airways diseases. In asthma and chronic obstructive pulmonary disease (COPD) there is an increase in airway muscle tone (airway constriction) which compromises the normal movement of gasses and contributes to the morbidity and mortality of the diseases. There is a growing body of evidence to suggest that exaggerated airway muscle tone may in part result from dysfunction of either the contractile or relaxant parasympathetic nerves innervating the airways. However, at present very little is known about the parasympathetic pathways regulating airway caliber. A complete understanding of the mechanisms controlling airway smooth muscle tone is therefore essential to fully understanding possible role of autonomic dysfunction in the pathogenesis of obstructive airways diseases. The aim of this grant is to better define the physiological and anatomical properties of airway parasympathetic nerves in the brain stem.Read moreRead less
Reduction Of The Cardiovascular Response Of Psychological Stress Through Blockade Of Orexin’s Action On One Of Its Receptors.
Funder
National Health and Medical Research Council
Funding Amount
$394,925.00
Summary
Anxiety, fear of challenges, frustration are part of modern life stressors. Our body reacts to these stressors by increasing blood pressure and heart rate, which in turn can harm our cardiovascular system and precipitate cardiovascular accidents. In this project we test a new class of drugs that act on a neurochemical system implicated in these particular responses. If our hypothesis is correct, one of these drugs could be used to relax the cardiovascular system and protect it in times of stress ....Anxiety, fear of challenges, frustration are part of modern life stressors. Our body reacts to these stressors by increasing blood pressure and heart rate, which in turn can harm our cardiovascular system and precipitate cardiovascular accidents. In this project we test a new class of drugs that act on a neurochemical system implicated in these particular responses. If our hypothesis is correct, one of these drugs could be used to relax the cardiovascular system and protect it in times of stress.Read moreRead less