¡iAbstract¡j
Neurogenic inflammation can be initiated by activation of sensory nerves to release neuropeptides, including tachykinins and calcitonin gene-related peptide. Capsaicin stimulation induces the release of substance P, the most important tachykinin and other neurotransmitters from sensory nerves to cause an increase of plasma leakage via the binding of substance P to NK1 receptors on endothelial cells. It has been proven that hyperthermic pretreatment decreases microvascular protein leakage and attenuates hypotension in anaphylactic shock in rats. Heat shock proteins¡]HSPs¡^are families of phylogenetically conserved molecules that have a protective role in all living cells under stress . Heat shock proteins are induced by whole-body hyperthermia and persist for 6 days.
To establish the relationship between heat shock and neurogenic inflammation, the present study investigated whether whole-body hyperthermia pretreatment, at 42 ¢J for 15 min in rats 1 day earlier, could suppress inflammatory response in the lower airways and esophagus evoked by capsaicin (90 µg/ml/kg) or substance P (3 µg/ml/kg ). The magnitude of neurogenic inflammation in the trachea and bronchi was expressed by the area density of India ink-labeled leaky blood vessels in the airway mucosa. One day after heat shock pretreatment, capsaicin-evoked inflammation was reduced by one half to two thirds, and reduced substance P-evoked inflammation by one third. Six days after exposure to heat shock, neurogenic inflammation was not inhibited. HSPs appeared overexpressed in trachea and esophagus tissue in the rats one day after hyperthermia, but was less expressed 6 days after hyperthermia.
It is suggested that exposure of the rats to whole-body hyperthermia caused an increased production of HSPs that might influence the affinity of the binding of substance P to NK1 receptors on venule endothelial cells, and reduce the amount of neurogenic plasma leakage.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0826103-140809 |
| Date | 26 August 2003 |
| Creators | Wang, Peng-Han |
| Contributors | Hung-Tu Huang, Jiin-Tsuey Cheng, Julie Yu-Hwa Chan |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0826103-140809 |
| Rights | withheld, Copyright information available at source archive |
Page generated in 0.0021 seconds