Immune Activation and Drug Absorption in HIV-Infected Patients
Information provided by (Responsible Party)
First received: April 29, 2013
Last updated: February 28, 2017
Last Verified: February 2017
History of Changes
The investigators' objective is to describe the variability of rifampicin absorption, markers of inflammation and gut damage, intestinal absorptive capacity, and intestinal permeability among HIV-infected volunteers. Rifampicin is the least well absorbed of the first-line anti-tuberculosis drugs. Rifampicin malabsorption is frequently observed in HIV-infected patients with active tuberculosis, but cannot be predicted by patient factors such as CD4+ T cell count, viral load, or the presence of diarrhea. The mechanisms for rifampicin malabsorption in HIV-infected patients are unknown. An understanding of mechanisms for rifampicin malabsorption could eventually lead to new therapeutic targets, with the ultimate goal of improving HIV/tuberculosis treatment outcomes.
Drug : Rifampicin 600 mg
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Basic Science
|Official Title:||Immune Activation and Drug Absorption in HIV-Infected Patients|
Further study details as provided by Drexel University:
Primary Outcome Measures
Rifampicin Absorption (Ka)
[ Time Frame: Baseline ]
The investigators will perform a pharmacokinetic study to assess rifampicin absorption among study subjects. Pharmacokinetic modeling will be used to assess the absorption rate constant (Ka) for each subject.
|Study Start Date:||June 2014|
|Study Completion Date:||March 14, 2016|
|Primary Completion Date:||March 2016 (Final data collection date for primary outcome measure)|
HIV-infected subjects who have not yet initiated highly active antiretroviral therapy (HAART). All enrolled subjects will receive a single dose of rifampicin 600 mg.
Rifampicin 600 mg
The investigators will administer a single dose of rifampicin 600 mg to study subjects in order to conduct a pharmacokinetic study of rifampicin absorption.
Other Name: rifamycin
The dosing scheme for rifampicin for the treatment of tuberculosis was developed in the
pre-HIV era, and achieving target concentrations at the site of infection is important for a
successful outcome. Rifampicin is the least well absorbed of the first-line anti-TB drugs and
may depend on active transport across the intestinal barrier. Rifampicin malabsorption is
frequently observed in HIV/tuberculosis patients, but cannot be predicted by patient factors
such as CD4+ T cell count, viral load, or the presence of diarrhea. Most importantly, loss of
rifampicin absorptive capacity in the setting of HIV infection would explain the inferior
treatment outcomes that are characteristic of HIV-associated tuberculosis, including early
mortality, relapse after the completion of therapy, and the development of
rifampicin-resistant infection during anti-tuberculosis therapy.
The gut-associated lymphoid tissue is the site of early and dramatic lymphocyte depletion in HIV+ patients, with near complete loss of intestinal CCR5+ CD4+ T cells within the first few weeks of infection. Lymphocyte depletion is accompanied by the loss of intestinal epithelial barrier integrity, and recent attention has focused on potential role of bacterial translocation across the damaged ("leaky") intestinal barrier. In support of this model, systemic immune activation markers have been shown to predict HIV progression better than CD4+ T cell count or HIV viral load. Independent of the potential role of bacterial translocation, the damage to gut epithelium may have other profound consequences for the HIV-infected patient.
The impact of this disease progression on the enterocyte's capacity to absorb specific drugs and nutrients has not been adequately explored. Loss of rifampicin absorptive capacity in the setting of HIV infection would explain the inferior treatment outcomes that are characteristic of HIV-associated tuberculosis, including early mortality, relapse after the completion of therapy, and the development of rifampicin resistant infection during anti-tuberculosis therapy. Therefore, we propose a pilot study of the relationship between immune activation, rifampicin absorption, and intestinal capacity for carrier-mediated transport and permeability, which will lay the foundation for a K23 Career Development Award application to the Division of AIDS, NIAID.
Rifampicin is an-antibacterial compound from the rifamycin family that is used for the treatment of certain bacterial infections, and is the cornerstone of the first-line treatment regimen for tuberculosis. Polymorphisms in a specific drug uptake transporter gene, SLCO1B1, lead to significant variability in the pharmacokinetics of rifampicin. Other host factors that negatively influence rifampicin absorption are not well understood, particularly in the high-risk group of HIV-infected patients with active tuberculosis.
Long-term use of rifampicin is rarely associated with adverse effects that include a flu-like illness and anemia. Both of these effects cease after termination of the drug. Neither of these effects has been reported after a single dose administration. Hypersensitivity reactions presenting with rash have also been reported after prolonged use of rifampicin, but would be rare after a single-dose administration. The risks associated with rifampicin have been minimized by studying pharmacokinetics after administration of a single dose, rather than after prolonged use. Rifampicin is a potent inducer of the cytochrome p450 enzyme system that is involved in the metabolism of many commonly used therapeutic compounds. For this reason, we will exclude participants who are receiving any prescription medications with clinically significant drug-drug interactions with rifampicin.
|Ages Eligible for Study:||21 Years to 45 Years|
|Sexes Eligible for Study:||All|
|Accepts Healthy Volunteers:||No|
- HIV-infected males and females, between the ages of 21 and 45 years.
- Naïve to antiretroviral therapy
- T cell count greater than 350 cells/mm3
- Body Mass Index (BMI) greater or equal to 19 and less than or equal to 33.
- Weight greater than 60 kilograms.
- Ability and willingness to provide informed consent.
- Ability to swallow oral medications
- Allergy or sensitivity to rifampicin.
- Prior history of documented active tuberculosis infection.
- Receipt of any investigational therapy, chemotherapy, or immune modulatory agents within 42 days prior to study entry.
- The following laboratory values obtained within 42 days prior to study entry:
- Positive blood test for latent tuberculosis infection (T-SPOT)
- Female participants of reproductive potential must have a negative serum or urine pregnancy test performed with 28 days prior to study entry.
- Female participants of reproductive potential that are using oral contraceptive pills (OCPs) must be willing to use barrier precautions for contraception for at least 7 days following each study visit.
- Use of any of the following prescription medications within 30 days prior to study
entry, which may have drug-drug interactions with rifampicin, including (but not
- Anti-coagulants (warfarin)
- Cardiac drugs (digoxin, quinidine, verapamil, nifedipine, metoprolol, atenolol, carvedilol)
- Hypoglycemics (rosiglitazone, pioglitazone, glipizide, repaglinide)
- Proton pump inhibitors (omeprazole, esomeprazole,
- Immune modulators (tacrolimus, cyclosporine)
- Corticosteroids (dexamethasone, prednisone, hydrocortisone)
- H2 blockers (ranitidine, cimetidine)
- HMG CoA reductase inhibitors (atorvastatin, pravastatin, simvastatin)
- Benzodiazepines (alprazolam, diazepam, midazolam, triazolam)
- CNS-acting drugs (amitriptyline, buproprion, clozapine, phenytoin)
- Evidence of current ongoing tobacco use, illicit drug use, or average alcohol use of greater than 2 drinks per day.
- Any illness that, in the opinion of the study investigator, might confound the results
Hemoglobin < 12.0 g/dL; Females: Hemoglobin < 11.0 g/dL Platelet count < 100,000/mm3 AST, ALT, and bilirubin > 5x ULN An estimated creatinine clearance < 80 mL/min based on the Cockroft-Gault equation
"Female participants of reproductive potential" is defined as women who have reached menarche or who have not been post-menopausal for at least 24 consecutive months (i.e. who have had menses within the preceding 24 months) or who have not undergone surgical sterilization (e.g. hysterectomy, or bilateral oophorectomy or salpingectomy).
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Please refer to this study by its ClinicalTrials.gov identifier: NCT01845298
Locations Show More
|United States, Pennsylvania|
|Drexel University College of Medicine|
|Philadelphia, Pennsylvania, United States, 19102|
Sponsors and CollaboratorsDrexel University
|Principal Investigator:||Christopher Vinnard, MD||Faculty|
|Responsible Party:||Drexel University|
|ClinicalTrials.gov Identifier:||NCT01845298 History of Changes|
|Other Study ID Numbers:||TMC114HIV4076|
|Study First Received:||April 29, 2013|
|Last Updated:||February 28, 2017|
|Individual Participant Data|
|Plan to Share IPD:||No|
Additional relevant MeSH terms:
ClinicalTrials.gov processed this data on October 23, 2017
This information is provided by ClinicalTrials.gov.