Pathogen Specific Immunity in Patients With Sarcoidosis
|The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.|
|ClinicalTrials.gov Identifier: NCT00217789|
Recruitment Status : Completed
First Posted : September 22, 2005
Last Update Posted : December 24, 2013
|Condition or disease||Intervention/treatment|
|Sarcoidosis||Procedure: Bronchoalveolar Lavage and Venipuncture|
Since its initial description 125 years ago, sarcoidosis continues to be a "challenging" disease. Its etiology remains unknown. Discovering the etiology of sarcoidosis remains a major goal with important implications regarding treatment, predicting outcome, as well as determining approaches for preventive measures. Immunological responses and granulomatous tissue formation characterizing sarcoidosis are similar to those observed in a variety of infectious diseases. However, the nature of the specific antigen(s), which putatively trigger the inflammatory response in sarcoidosis, remains elusive. Occurrence of sarcoidosis in spatially related clusters, and household and health care settings strongly support person-to-person transmission of an infectious agent as one of the potential causes of this disease. Sarcoidosis has been associated with a variety of infectious agents, none of which can be cultured. Propionibacterium acnes (P. acnes) and M.tuberculosis (Mtb) are the most commonly identifiable infectious pathogens by PCR-based methods and considered to be associated with the development of this disease. Immunological studies in sarcoidosis have focused largely on the assessment of constitutive, immune responses and the description of the phenotypes of blood and lung cells in patients and control subjects.
This study will utilize memory immune responses as search tools for the 'immunological imprints' from P. acnes or Mtb exposure. Peripheral blood mononuclear cells and bronchoalveolar cells will be compared from patients with stage II and/or stage III sarcoidosis and from healthy control subjects. Investigators will use ELISPOT assay to study: (1) frequencies of pathogen-specific interferon-7 and interleukin-10-producing cells, and (2) utilizing P. acnes- or Mtb-infected autologous monocytes and alveolar macrophages as target cell frequencies of pathogen-specific granzyme B-releasing cytotoxic T lymphocytes and natural killer cells. Finally, investigators will test the feasibility of identifying by DNA micro array, pathogen specific, transcriptional host gene expression profiles in P. acnes- and Mtb-stimulated blood cells from healthy control subjects and patients with active sarcoidosis and to compare these with gene expression profiles from autologous, unstimulated in situ lung cells. The studies will address the role of P. acnes and Mtb in the etiology of sarcoidosis and will also serve as a basis or model for future work involving other possible infectious or non-infectious pathogens/antigens for the development of sarcoidosis.
|Study Type :||Observational|
|Actual Enrollment :||5 participants|
|Official Title:||Pathogen Specific Immunity in Sarcoidosis|
|Study Start Date :||July 2004|
|Actual Primary Completion Date :||June 2008|
|Actual Study Completion Date :||June 2008|
- Pathogen Specific Immunity in Sarcoidosis [ Time Frame: July 2004 - June 2008 ]Toxicity, DEP-Induced Cytokines, Effect of DEP on Stimulant-Induced Cytokine Production, in vitro Effects of DEP on M.tb-induced Cytokine Production, time kinetics of In vitro effects of DEP on M.tb-induced cytokine production, effect of DEP Exposure on M.tb H37Ra-induced Lymphocyte Proliferation, whole blood killing experiments
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00217789
|United States, New Jersey|
|University of Medicine and Dentistry of New Jersey|
|Newark, New Jersey, United States, 07103|
|Principal Investigator:||Stephan Schwander, MD, PhD||University of Medicine and Dentistry of New Jersey|