The Role of Inflammasome in Inflammatory Macrophage in Mycobacterium Avium Complex-lung Disease and Mycobacterium Abscessus-lung Disease

1. To investigate the inflammasome response of inflammatory and resting macrophage derived from healthy human participants by stimulation using MAC or MAB bacilli.
2. To compare the difference of inflammasome response of inflammatory macrophage by MAC/MAB bacilli stimulation between MAC/MAB-LD patients and the colonizers.
3. To study the diagnostic aid from immunological markers in inflammasome response in inflammatory macrophage stimulated by MAC/MAB.

Study Overview

• Status: Unknown
• Conditions: To Investigate the Inflammasome Response of Inflammatory and Resting Macrophage; To Compare the Difference of Inflammasome Response of Inflammatory Macrophage; To Study the Diagnostic Aid From Immunological Markers in Inflammasome Response

Detailed Description

Lung disease (LD) due to nontuberculous mycobacteria (NTM) becomes an important clinical concern, because the incidence and prevalence of NTM-LD have increased over the last decade. Among the NTM-LD in Taiwan, Mycobacterium avium complex (MAC) and M. abscessus (MAB) are the most frequent pathogenic species. Because MAC and MAB exist in the environment ubiquitously, clinical relevance of MAC isolated in sputum is only around 35~42%, and that of MAB is around 33%. According to the guideline of the American Thoracic Society, the diagnosis of MAC-LD and MAB-LD is based on clinical, radiographic, and mycobacteriologic criteria. For microbiology criteria, two or more sets of positive sputum mycobacterial culture for the same NTM species within one year is required. Actually, mycobacteria culture is neither timely nor efficient, which needs weeks to wait the results, especially for the slowly growing NTM. Moreover, the nucleic acid amplification method cannot discriminate true NTM infection and solely colonization because airway NTM colonization is not uncommon. Therefore, diagnosis of true NTM-LD is a big challenge in clinical practice. However, to early diagnose and then start treatment of NTM-LD is important because NTM-LD may be rapid lethal in critical status or in patients without early proper treatment. Hence, more rapid and accurate diagnostic test should be developed.

The body inflammatory markers are probably indicators for differentiating true NTM-LD from pulmonary colonization and interferon-gamma (IFN-g) play a critical role in protective immunity to mycobacterial infections. However, serum IFN-g poorly correlated with diagnosis of NTM-LD and possibly due to the hosts with attenuated cellular immunity and the presence of IFN-gamma inhibitor. By contrast, macrophages are the first-line defense while mycobacterial bacilli enter through airway and may play an important role while MAC/MAB infection. Macrophages can be polarized to inflammatory type and promotes type 1 immunity. In addition, inflammatory macrophages can react through inflammasome to defense intracellular mycobacteria. However, the inflammasome responses in inflammatory macrophages are rarely investigated in MAC-LD and MAB-LD, either for the defense mechanism or its diagnostic aid for disease form colonization. The investigators therefore conduct an in-vitro inflammatory macrophage stimulation using MAC or MAB bacilli to observe the difference of inflammasome response between MAC/MAB patients, colonizers, and controls.

• Study Type: Observational
• Enrollment (Anticipated): 100

Contacts and Locations

Study Locations

• Taiwan
  • Taipei, Taiwan, 100
    • Recruiting
    • National Taiwan University Hospital
    • Contact: Chin-CHung Shu, MD; Phone Number: 886-972653087

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 20 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

• Sampling Method: Probability Sample

Study Population

1. Age ≥ 20 years
2. MAC/MAB lung disease: Diagnosis is based on the guidelines made by American Thoracic Society (Table 1)[1]. In brief, there should be pulmonary symptoms, comparable findings in chest image and appropriate exclusion other possible causes as well as meeting the microbiology criteria.
3. MAC/MAB pulmonary colonizers: Those without fulfilling the diagnostic criteria but having at least one set of positive sputum for MAC/MAB are defined.
4. Healthy controls: patient without documented MAC/MAB lung disease and pulmonary colonization

Description

Inclusion Criteria:

• Age ≥ 20 years
• MAC/MAB lung disease: Diagnosis is based on the guidelines made by American Thoracic Society (Table 1)[1]. In brief, there should be pulmonary symptoms, comparable findings in chest image and appropriate exclusion other possible causes as well as meeting the microbiology criteria.
• MAC/MAB pulmonary colonizers: Those without fulfilling the diagnostic criteria but having at least one set of positive sputum for MAC/MAB are defined.
• Healthy controls: patient without documented MAC/MAB lung disease and pulmonary colonization

Exclusion Criteria:

• Patients who have acquired immunodeficiency syndrome
• Patients who have bleeding tendency which cannot tolerate venous puncture such as hemophilia, thrombocytopenia.
• refusal of recruitment

Study Plan

How is the study designed?

Number of groups / cohorts

3

Cohorts and Interventions

Group / Cohort
Healthy group; patients without MAC/MAB lung disease and colonization
MAC/MAB colonization group; patients with pulmonary MAC/MAB colonization
MAC/MAB lung disease group; Patient with MAC/MAB lung disease

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
survival	one year

Secondary Outcome Measures

Outcome Measure	Time Frame
the amount of cytokine released by inflammatory macrophage	Day 1

Collaborators and Investigators

• Sponsor: National Taiwan University Hospital
• Investigators: Principal Investigator: Chin-Chung Shu, MD, National Taiwan University Hospital

Study record dates

Study Major Dates

• Study Start: November 1, 2013
• Primary Completion (Anticipated): August 1, 2015

Study Registration Dates

• First Submitted: November 26, 2013
• First Submitted That Met QC Criteria: December 3, 2013
• First Posted (Estimate): December 9, 2013

Study Record Updates

• Last Update Posted (Estimate): June 30, 2014
• Last Update Submitted That Met QC Criteria: June 27, 2014
• Last Verified: June 1, 2014

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Infections; Respiratory Tract Diseases; Bacterial Infections; Bacterial Infections and Mycoses; Gram-Positive Bacterial Infections; Actinomycetales Infections; Mycobacterium Infections, Nontuberculous; Lung Diseases; Mycobacterium Infections; Mycobacterium avium-intracellulare Infection
• Other Study ID Numbers: 201308008RINA