Impact of HIV Infection on Latent Tuberculosis (TB) Among Patients With HIV-TB Co-infection

NCT ID: NCT00692809

Last Updated: 2009-09-15

Basic Information

• Recruitment Status: UNKNOWN
• Total Enrollment: 180 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2008-07-31
• Study Completion Date: 2010-03-31

Brief Summary

HIV induced altered representation and function of regulatory T cell subsets (NKT and Treg cells) impair the protective T cell response against M.tuberculosis and disrupts LTBI, thus facilitates faster progression and development of severe forms of clinical TB in HIV-TB co-infection.

Detailed Description

During the natural course of HIV disease, emergence of opportunistic infection not only imposes morbidity on HIV-TB co-infected patients, but also facilitates viral replication causing faster disease progression. Tuberculosis, being the commonest among the opportunistic infections among HIV infected persons deserves special attention. Moreover, disruption of latency of TB infection (LTBI) with development of more severe clinical forms at relatively early stage of HIV disease when CD4 count still remains above 300/ul, makes TB a unique opportunistic infection and negatively influence the outcome of dual infection.This is suggestive of impairment of some critical immune function involving relatively less frequent fine T cell subsets with functional hierarchy over bulk T cells, so as to weaken the immune containment of LTBI resulting in reactivation of M. tuberculosis and manifestation of severe forms of TB.HIV has recently been reported to preferentially infect, destroy and incapacitate two key immune-regulatory T cell subsets, namely NKT and Treg cells.Therefore, studying them along the course of HIV disease and impact of their changes on the function of effector T cells directed against M.tuberculosis is important.

Conditions

Latent Tuberculosis Infection; HIV Infections; Tuberculosis

Study Design

• Study Time Perspective: PROSPECTIVE

Study Groups

1

HIV+ve+LTBI (n=100)

No interventions assigned to this group

2

HIV+ve+clinical TB (n=50)

No interventions assigned to this group

3

HIV-ve+clinical TB (n=15)

No interventions assigned to this group

4

Normal control (n=15)

No interventions assigned to this group

Eligibility Criteria

Inclusion Criteria

HIV infected +LTBI group:

• Patient of either sex between 18-65 years of age
• All the patients should be HIV ELISA test positive irrespective of CD4 count and presence of other opportunistic infections Antiretroviral drug naive HIV patients
• No past history of TB
• Patients should be either tuberculin test positive (> 5mm) or interferon gamma release assay positive
• Written informed consent to participate in the study given by participants or legal guardian
• Patients able to comply with instructions and come back for a regular follow up

HIV infected + Clinical TB group:

• Patient of either sex between 18-65 years of age
• All the patients should be HIV ELISA test positive irrespective of CD4 count and presence of other opportunistic infections
• In PTB group, patient should be two sputum smear positive out of three consecutive samples
• In EPTB group, diagnosis of TB will be:

• Definitive -Culture confirmed
• Probable -Histopathological or radiological -Clinical features and response to anti TB treatment (ATT)
• Possible TB -Clinical feature and response to anti TB treatment (ATT)
• Written informed consent to participate in the study given by participants or legal guardian
• Patients able to comply with instructions and come back for a regular follow up

HIV negative Clinical TB group:

• Patients of either sex between 18-65 years of age who are permanent resident of Delhi
• All patients should be HIV ELISA negative
• In PTB group, patients should be two sputum smear positive (at least 1+) out of three consecutive samples
• In EPTB group, diagnosis of TB will be:

• Definitive -Culture-confirmed
• Probable -Histopathological or radiological -Clinical features and response to anti-TB treatment (ATT)
• Possible TB -Clinical features and response to anti-TB treatment (ATT)
• Written informed consent to participate in the study given by participants or legal guardian
• Patients able to comply with instructions and come back for a regular follow up

Normal controls:

• Persons of either sex between 18-65 years of age who are permanent resident of Delhi
• Written informed consent to participate in the study given by participants or legal guardian
• Person should not have past history of TB

• Mantoux test negative (< 10mm)
• Chest-X-ray normal
• Hemogram normal
• Renal and liver functions normal
• Hepatitis viral markers normal
• No clinical evidence of malnutrition
• HIV ELISA negative

Exclusion Criteria

HIV infected +LTBI group:

• Pregnant and lactating females
• Patients who are getting steroid therapy
• Transplant patients, diabetes mellitus or malignancy, chronic renal failure or liver diseases
• Currently receiving cytotoxic therapy, or have received it within the last 3 months
• Terminally ill as per treating clinician's judgment
• Patient from outside Delhi and migrants

HIV infected + Clinical TB group:

• Category II and multidrug-resistant pulmonary tuberculosis
• Pregnant and lactating females
• Patients who are getting steroid therapy
• Transplant patients, diabetes mellitus or malignancy, chronic renal failure or liver diseases
• Currently receiving cytotoxic therapy, or have received it within the last 3 months
• Terminally ill patient as per treating clinician's judgment
• Patients from outside Delhi and migrants

HIV negative Clinical TB group:

• Category II and multi drug-resistant pulmonary tuberculosis
• Patients who are getting steroid therapy
• Transplant patients, diabetes mellitus or malignancy, chronic renal failure or liver disease
• Currently receiving cytotoxic therapy, or have received it within the last 3 months
• Terminally ill patient as per treating clinician's judgment
• Patients unwilling to comply with the study procedures or those with history of alcohol or drug abuse

Normal controls:

• Transplant patients, diabetes mellitus or malignancy
• Patients unwilling to comply with the study procedures or those with history of alcohol or drug abuse

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 65 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

Indian Council of Medical Research

OTHER_GOV

Sponsor Role: collaborator

Ministry of Science and Technology, India

OTHER_GOV

Sponsor Role: lead

Responsible Party

All India Institute of Medical Sciences

Principal Investigators

Surendra K Sharma, M.D., Ph.D

Role: PRINCIPAL_INVESTIGATOR

All India Institute of Medical Sciences

Locations

All India Institute of Medical Sciences

New Delhi, National Capital Territory of Delhi, India

Site Status: RECRUITING

Countries

India

Central Contacts

Surendra K Sharma, M.D., Ph.D

Role: CONTACT

surensk@gmail.com

26594415

Facility Contacts

Surendra K Sharma, M.D., Ph.D

Role: primary

surensk@gmail.com

26594415

Sanjeev Sinha, MD

Role: backup

drsanjeevsinha2002@yahoo.com

26594440

Other Identifiers

SKS/LTBI/07

Identifier Type: -

Identifier Source: org_study_id