Body Mass Index and Early CD4 T-cell Recovery Among Adults Initiating Antiretroviral Therapy in North America, 1998-2010

HIV Med. 2015 Oct;16(9):572-7. doi: 10.1111/hiv.12259. Epub 2015 May 11.

Abstract

Objectives: Adipose tissue affects several aspects of the cellular immune system, but prior epidemiological studies have differed on whether a higher body mass index (BMI) promotes CD4 T-cell recovery on antiretroviral therapy (ART). The objective of this analysis was to assess the relationship between BMI at ART initiation and early changes in CD4 T-cell count.

Methods: We used the North American AIDS Cohort Collaboration on Research and Design (NA-ACCORD) data set to analyse the relationship between pre-treatment BMI and 12-month CD4 T-cell recovery among adults who started ART between 1998 and 2010 and maintained HIV-1 RNA levels < 400 copies/mL for at least 6 months. Multivariable regression models were adjusted for age, race, sex, baseline CD4 count and HIV RNA level, year of ART initiation, ART regimen and clinical site.

Results: A total of 8381 participants from 13 cohorts contributed data; 85% were male, 52% were nonwhite, 32% were overweight (BMI 25-29.9 kg/m(2) ) and 15% were obese (BMI > 30 kg/m(2) ). Pretreatment BMI was associated with 12-month CD4 T-cell change (P < 0.001), but the relationship was nonlinear (P < 0.001). Compared with a reference of 22 kg/m(2) , a BMI of 30 kg/m(2) was associated with a 36 cells/μL [95% confidence interval (CI) 14, 59 cells/μL] greater CD4 T-cell count recovery among women and a 19 cells/μL (95% CI 9, 30 cells/μL) greater recovery among men at 12 months. At a BMI > 30 kg/m(2) , the observed benefit was attenuated among men to a greater degree than among women, although this difference was not statistically significant.

Conclusions: A BMI of approximately 30 kg/m(2) at ART initiation was associated with greater CD4 T-cell recovery at 12 months compared with higher or lower BMI values, suggesting that body composition may affect peripheral CD4 T-cell recovery.

Keywords: HIV; antiretroviral therapy; immune reconsitition; nutrition; obesity.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Adult
  • Anti-HIV Agents / therapeutic use*
  • Body Mass Index*
  • CD4 Lymphocyte Count
  • CD4-Positive T-Lymphocytes / drug effects*
  • CD4-Positive T-Lymphocytes / immunology
  • Datasets as Topic
  • Female
  • HIV Infections / drug therapy*
  • HIV Infections / immunology*
  • HIV Infections / physiopathology
  • Humans
  • Male
  • Middle Aged
  • North America
  • Regression Analysis
  • Treatment Outcome

Substances

  • Anti-HIV Agents

Grant support