Comparison of HIV-Infected and Noninfected Patients Undergoing Bariatric Surgery: The ObeVIH Study

Five-Year Outcomes of Bariatric Surgery vs. Conservative Weight Management in People with HIV: A Single-Center Tertiary Care Experience

INTRODUCTION

Individuals with human immunodeficiency virus (HIV) infection now have life expectancies similar to non-infected people but face increased obesity prevalence. The long-term effects of bariatric surgery (BS) and conservative weight therapy (CWT) in patients living with HIV (PLWH) remain unexplored.

METHODS

A retrospective review (2012-2018) at a Tertiary Centre for Bariatric Surgery and National Centre for HIV care examined the outcomes of BS and CWT. Parameters evaluated included weight loss and HIV metrics such as viral load and CD4 count.

RESULTS

The study included 24 chronic HIV patients, with 10 undergoing BS (5 laparoscopic adjustable gastric banding (LAGB), 3 laparoscopic sleeve gastrectomy (LSG), 2 Roux-en-Y gastric bypass (LRYGB) and 14 in CWT. The BS group showed significant BMI reduction (- 7.07, - 6.55, - 7.81 kg/m2 at 1, 3, and 5 years). The CWT group's BMI reduction was non-significant. The BS group's %TWL was 16%, 17.8%, and 15% at 1, 3, and 5 years, respectively; however, stapled procedures were more effective, at 1 year, %TWL was 17% LSG and 25% RYGB, at 3 years, 23% LSG, 30% RYGB and at 5 years 21% with LSG and 28% with RYGB. HIV outcomes remained stable with undetectable viral loads in the BS group.

DISCUSSION

BS appears to be a safe and effective medium-term treatment for obesity in PLWH, providing significant weight loss whilst maintaining the efficacy of HIV treatments. Although CWT has shown modest benefits, the outcomes from BS indicate that it could be a preferable option for managing obesity in PLWH based on this limited dataset.

Recent data on the role of antiretroviral therapy in weight gain and obesity in persons living with HIV

PURPOSE OF REVIEW

Antiretroviral therapy (ART) has long been implicated in fat alterations and weight variations leading to cardiometabolic consequences. Recent largely prescribed antiretrovirals (ARVs) from the integrase-strand-transfer-inhibitor (INSTI) class have been associated with excessive weight gain/obesity in a minority of persons with HIV (PWH). As well, in the nucleoside reverse transcriptase inhibitors (NRTI) class, tenofovir-alafenamide (TAF), often replacing tenofovir-disoproxil-fumarate (TDF), has been associated with weight gain, a worrying concern in the present worldwide obesogenic environment. The respective role of the different ARV, the risk factors and the mechanisms remain questionable.

RECENT FINDINGS

The INSTIs dolutegravir (DTG) and bictegravir (BIC) and TAF have a proper effect on weight gain, while efavirenz (EFV) and TDF inhibit it. These effects are reported in ART-naïve PWH, in addition to weight gain resulting from the return to health process, and in ART-controlled PWH. Also, INSTIs induce weight gain in adolescents and excessive weight gain during pregnancy. The effects of INSTIs and TAF are additive. Their trajectory differs. Most of the weight gain is observed during the initial 12-month period.The main risk factors are low CD4+ and high viral load (VL) in ART-naïve PWH, Black race or originating from some African countries and female gender. The role of age and BMI differs between studies. The reversibility of the effect of INSTI and TAF appears limited.Regarding the mechanisms, the INSTIs can directly alter adipose tissue in particular through inhibition of fat beiging, resulting in fat fibrosis and hypertrophy. Macrophage infiltration is decreased. The mechanisms explaining the opposite effects of TDF and TAF remain elusive.

SUMMARY

The specific impact of DTG, BIC and TAF on weight gain/obesity in PWH is confirmed in different populations independently of the weight limiting effect of EFV and TDF. ART-linked excessive weight gain is uncommon. African origin and female sex are risk factors that need to be considered. The mechanisms are better understood for INSTIs but unknown for TDF/TAF. The reversibility of weight gain/obesity when stopping INSTI or TAF remains limited.

Prolonged Antiretroviral Treatment Induces Adipose Tissue Remodelling Associated with Mild Inflammation in SIV-Infected Macaques

During chronic SIV/HIV infection, adipose tissue (AT) is the target of both antiretroviral treatment (ART) and the virus. AT might subsequently contribute to the low-grade systemic inflammation observed in patients on ART. To evaluate the inflammatory profile of AT during chronic SIV/HIV infection, we assayed subcutaneous and visceral abdominal AT from non-infected (SIV−, control), ART-naïve SIV-infected (SIV+) and ART-controlled SIV-infected (SIV+ART+) cynomolgus macaques for the mRNA expression of genes coding for factors related to inflammation. Significant differences were observed only when comparing the SIV+ART+ group with the SIV+ and/or SIV− groups. ART-treated infection impacted the metabolic fraction (with elevated expression of PPARγ and CEBPα), the extracellular matrix (with elevated expression of COL1A2 and HIF-1α), and the inflammatory profile. Both pro- and anti-inflammatory signatures were detected in AT, with greater mRNA expression of anti-inflammatory markers (adiponectin and CD163) and markers associated with inflammation (TNF-α, Mx1, CCL5 and CX3CL1). There were no intergroup differences in other markers (IL-6 and MCP-1). In conclusion, we observed marked differences in the immune and metabolic profiles of AT in the context of an ART-treated, chronic SIV infection; these differences were related more to ART than to SIV infection per se.