Effect of an Immunotoxin on Activated Human Macrophages in Those With Allergic Rhinitis or Mild Intermittent Asthma
Summary
The primary objective of this study is to isolate macrophages by using bronchoalveolar lavage (BAL) for different in vitro experiments.
Therefore, following a baseline BAL, allergen, endotoxin, and saline will be instilled into three different lung segments during the first bronchoscopy. After 24 hours during a second bronchoscopy, BAL fluid will be collected in these challenged segments to harvest invaded cells for in vitro experimentation. In addition, segmental bronchial biopsies will be taken to assess the degree of local inflammation.
Study Design
Allocation: Non-Randomized, Control: Placebo Control, Endpoint Classification: Efficacy Study, Intervention Model: Single Group Assignment, Masking: Open Label
Conditions
Atopy
Intervention
bronchoscopy, allergen/endotoxin instillation
Location
Fraunhofer ITEM
Hannover
Germany
30625
Status
Terminated
Source
Fraunhofer-Institute of Toxicology and Experimental Medicine
Results (where available)
Links
- Source: http://clinicaltrials.gov/show/NCT00295737
- Information obtained from ClinicalTrials.gov on July 15, 2010
Medical and Biotech [MESH] Definitions
Limulus Test
Sensitive method for detection of bacterial endotoxins and endotoxin-like substances that depends on the in vitro gelation of Limulus amebocyte lysate (LAL), prepared from the circulating blood (amebocytes) of the horseshoe crab, by the endotoxin or related compound. Used for detection of endotoxin in body fluids and parenteral pharmaceuticals.
Poa
A plant genus of the family POACEAE that contains the Poa p Ia allergen and allergen C KBGP.
Skin Test End-point Titration
A quantitative form of intradermal testing for the relative allergenicity of a substance. It is used to determine the amount of an allergen that will be tolerated in ALLERGEN IMMUNOTHERAPY.
Bronchoscopy
Endoscopic examination, therapy or surgery of the bronchi.
Shwartzman Phenomenon
Hemorrhagic necrosis that was first demonstrated in rabbits with a two-step reaction, an initial local (intradermal) or general (intravenous) injection of a priming endotoxin (ENDOTOXINS) followed by a second intravenous endotoxin injection (provoking agent) 24 h later. The acute inflammation damages the small blood vessels. The following intravascular coagulation leads to capillary and venous THROMBOSIS and NECROSIS. Shwartzman phenomenon can also occur in other species with a single injection of a provoking agent, and during infections or pregnancy. Its susceptibility depends on the status of IMMUNE SYSTEM, coagulation, FIBRINOLYSIS, and blood flow.
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