The normal functioning of many organs is controlled by several types of nerves through releasing chemicals called neurotransmitters. A new type of nerve has been identified recently; these are called nitrergic nerves. They release a nitric oxide-like transmitter to control the relaxation of smooth muscle. Although it is known that nitrergic nerves play important roles in the regulation of functions of various organs, the nature of its transmitter has not been elucidated. Our recent study suggest ....The normal functioning of many organs is controlled by several types of nerves through releasing chemicals called neurotransmitters. A new type of nerve has been identified recently; these are called nitrergic nerves. They release a nitric oxide-like transmitter to control the relaxation of smooth muscle. Although it is known that nitrergic nerves play important roles in the regulation of functions of various organs, the nature of its transmitter has not been elucidated. Our recent study suggests that the nitrergic transmitter is more close to a redox form of nitric oxide such as nitroxyl anion than to nitric oxide itself. This project will investigate further the mechanism of nitrergic transmission including the nature of the nitrergic transmitter. The proposed research will help to answer important questions regarding the mechanisms of nitrergic transmission and thus may throw additional light to the nature of the nitrergic transmitter. The findings may also be significant for the development of new drugs (such as new NO donors) which interact with nitrergic mechanisms.Read moreRead less
Intramuscular Interstitial Cells Of Cajal; Ion Channels And Their Modulation By Calcium Ions And Neurotransmitters.
Funder
National Health and Medical Research Council
Funding Amount
$523,261.00
Summary
Disorders of gut motility manifest themselves in several ways, as either patterns of hyperactivity or patterns of reduced activity. Under normal conditions gut motility reflects a balance between myogenic, neuronal and hormonal factors but as yet how this balance is normally achieved is not understood. This project will examine the properties of a class of cells, whose importance in both myogenic and neural control mechanisms has only been recognized over the last 10 years. The muscular wall of ....Disorders of gut motility manifest themselves in several ways, as either patterns of hyperactivity or patterns of reduced activity. Under normal conditions gut motility reflects a balance between myogenic, neuronal and hormonal factors but as yet how this balance is normally achieved is not understood. This project will examine the properties of a class of cells, whose importance in both myogenic and neural control mechanisms has only been recognized over the last 10 years. The muscular wall of the gut is made up of two distinct types of cells. One group, smooth muscle cells, contains contractile elements and the coordinated behavior of these cells leads to the contractions of the gut wall, so ensuring the controlled passage of gut contents along the gastrointestinal tract. The other group of cells, Interstitial cells of Cajal, lack contractile elements. One set of these cells have recently been found to be the pacemaker cells of the gut responsible for the initiation of myogenic activity. They generate pacemaker waves which ensure that the gut contracts rhythmically. Another set of these cells are densely innervated, they receive messages from the nervous system and translate these messages into signals which alter the activity of the gut. Thus these cells play a key role in the neural control of the gut. In many disease states, the numbers of interstitial cells of Cajal have been found to be reduced. However as yet we know very little about these cells. This project will, for the first time, examine the properties of the interstitial cells involved in neural control and will determine how they carry out these essential functions.Read moreRead less
Catheter Based Renal Denervation To Improve Outcomes In Congestive Heart Failure
Funder
National Health and Medical Research Council
Funding Amount
$619,194.00
Summary
In heart failure there is a large increase in sympathetic nerve activity that is detrimental to patient outcome, but the factors causing this increased activity are not well defined. There is evidence that renal nerves play a significant role. A novel catheter based technique allows silencing of these nerves. We will test whether this novel technique has the potential to improve the outcomes for patients with heart failure.