Niacin on Immune Activation : a Proof-of-concept Study

Primary objective

• To assess the impact of extended-release niacin (ER niacin) supplementation + antiretroviral therapy (ART) compared to ART alone on T-cell immune activation as defined by CD8CD38 percentage

Secondary objectives

• To assess the change in total CD4 T-cell count after ER niacin administration
• To explore the effect of ER niacin on regulatory T-cells (Th-17/Treg) in blood and gut mucosa samples
• To explore the effect of ER niacin on cytokines and inflammatory markers such as INF-α, IL-1, IL-6, IL-17, D-dimers, usCRP and LPS
• To assess the influence of ER niacin on tryptophan (Trp) plasmatic levels
• To assess changes in cholesterol and triglycerides
• To explore ER niacin tolerance
• To evaluate the impact of ER niacin on quality of life (QoL), fatigue, depression, and neurocognitive scores

Population: All participants will have an undetectable HIV viral load (< 50 copies/mL) for at least 3 months, current CD4 cell count of < 350 cells/µL and be receiving ART for at least the previous 12 months.

Sample size: N=20

Participants must meet all of the following criteria within four weeks prior to the Week 0 (Baseline) Visit to be considered eligible for entry into the study:

• Documented HIV infection by Western Blot, EIA assays or viral load assay
• Aged 21 or older
• Viral load < 50 copies/mL for the last 3 months
• CD4 cell count < 350 cells/µL
• On stable ART, i.e., ART unchanged for treatment failure (rebound in viral load) for more than 12 months
• Able to communicate adequately in either French or English
• Able and willing to give written informed consent prior to enrolment including access to relevant medical records.

Participants are not eligible to participate in the study if any of the following conditions are met:

• Pregnant, breastfeeding or planning to become pregnant during the course of the study. All fecund female participants must undergo a pregnancy test, with a negative result, prior to being eligible to participate in the study
• Prior history of hypersensitivity reaction to niacin or any other component of the study drug
• Prior history of flushing
• Active liver disease or unexplained persistent elevations of serum transaminases
• Co-infection with active Hepatitis B or C virus (positive HBs Ag or positive anti HBc antibodies with a detectable HBV DNA viral load or positive anti HCV antibodies with a detectable HCV RNA viral load)
• Alanine aminotransferase (ALT) or aspartate aminotransferase (AST) or alkaline phosphatase >2.5 x upper limit of normal (ULN)
• Active duodenal or gastric peptic ulcer
• Active bleeding disorders
• History of gout
• Active AIDS events in the last 3 months as determined by the treating physician
• Unstable angina or acute phase myocardial infarction, with or without vasodilator agents
• Diabetic or potentially diabetic with hypercholesterolaemia
• Renal dysfunction.