Weighing in on the Role of Integrase Strand Transfer Inhibitors (INSTIs) on Weight Gain: Fact or Fiction?

A review of dolutegravir-associated weight gain and secondary metabolic comorbidities

Dolutegravir is an integrase inhibitor and is recommended by the World Health Organization as the preferred first-line and second-line human immunodeficiency virus treatment in all populations. Excessive weight gain associated with dolutegravir-based regimens is an emerging issue; however, the long-term metabolic consequences of this effect have not been fully understood. Growing evidence shows that this leads to a higher incidence of hyperglycemia, hypertension, and metabolic syndrome, along with elevated cardiovascular risk. Dolutegravir-based regimens, also associated with greater adipocyte differentiation and greater expression of markers associated with lipid storage, continue to be a problem among patients living with human immunodeficiency virus. The mechanisms by which certain antiretroviral therapy agents differentially contribute to weight gain remain unknown. Some clinical investigators speculate that dolutegravir could interfere with central nervous system appetite regulation (melanocortin-4 receptor) and insulin signaling, or may have better penetration of adipose tissue where they could exert a direct impact on adipose tissue adipogenesis, fibrosis, and insulin resistance. This review summarizes our current understanding of weight gain and fat changes associated with dolutegravir and its possible secondary metabolic comorbidities.

Prevalence of overweight and obesity among adolescents living with HIV after dolutegravir - based antiretroviral therapy start in Kampala, Uganda

BACKGROUND

Dolutegravir (DTG)-based antiretroviral therapy (ART) is currently the preferred first-line treatment for persons living with HIV (PLHIV) including children and adolescents in many low- and middle-income countries including Uganda. However, there are concerns about excessive weight gain associated with DTG especially in adults. There remains paucity of current information on weight-related outcomes among adolescents on DTG. We determined the prevalence of excessive weight gain and associated factors among adolescents living with HIV (ALHIV) receiving DTG-based ART in Kampala, Uganda.

METHODS

Cross-sectional study involving ALHIV aged 10-19 years on DTG-based ART for at least one year were recruited from public health facilities in Kampala between February and May 2022. Excessive weight gain was defined as becoming overweight or obese per body mass index (BMI) norms while on DTG-based ART for at least one year. Demographic, clinical and laboratory data were collected using interviewer-administered questionnaires and data extracted from medical records. At enrolment, blood pressure and anthropometry were measured and blood was drawn for blood glucose and lipid profile. Data was summarised using descriptive statistics and logistic regression was performed to determine the associated factors.

RESULTS

We enrolled 165 ALHIV with a median age of 14 years (IQR 12-16). Eighty (48.5%) were female. The median duration on ART and DTG was 8 years (IQR 7-11) and 2 years (IQR 1-3) respectively. At DTG initiation, the majority of participants (152/165, 92.1%) were ART-experienced, and had normal BMI (160/165, 97%). Overall, 12/165 (7.3%) adolescents (95% CI: 4.2-12.4) had excessive weight gain. No factors were significantly associated with excessive weight gain after DTG start in ALHIV. However, all ALHIV with excessive weight gain were females.

CONCLUSION

Our study found a prevalence of 7.3% of overweight and obesity in ALHIV after initiating DTG. We did not find any factor significantly associated with excessive weight gain in ALHIV on DTG. Nonetheless, we recommend ongoing routine monitoring of anthropometry and metabolic markers in ALHIV as DTG use increases globally, to determine the exact magnitude of excessive weight gain and to identify those at risk of becoming overweight or obese while taking the medication.

Effect of dolutegravir-based first-line antiretroviral therapy on weight and body mass index among adult people living with HIV on follow up at health facilities in Hawassa city administration, Southern Ethiopia: a retrospective cohort study

BACKGROUND

The nature and burden of weight gain associated with antiretroviral treatment (ART) using a combination of Tenofovir disoproxil fumarate, lamivudine and dolutegravir (TLD) among people living with HIV (PLWH) has not been thoroughly investigated in Ethiopia. Therefore, this study aimed to evaluate changes in body weight and body mass index (BMI) in adults who initiated TLD or switched to TLD compared to those who received a non-nucleoside reverse transcriptase inhibitor (NNRTI)-based therapies.

METHODS

A retrospective cohort study was conducted among adult PLWH who had been receiving ART between February 2017 and October 2022 in Hawassa city administration, Sidama region. Linear mixed-effects model was used to examine BMI and body weight trends over time, while a binary logistic regression was performed to identify factors associated with a ≥ 10% weight gain.

RESULTS

A total of 524 adult PLWH with a median age of 35 (interquartile range: 30-41) years were included. TLD-initiated arm experienced significantly greater mean weight (8.6 kg vs. 4.95 kg, p < 0.0001) and BMI (3.11 kg/m2 vs. 1.84 kg/m2, p < 0.0001) increase than the NNRTI-based arm at two years. However, the switched arm showed no significant difference in weight (5.6 kg) and BMI (2.13 kg/m2) compared to the NNRTI-based arm (p > 0.05). There was a significant interaction effect between ART regimens and time in predicting weight and BMI gain (p < 0.01). Initiating ART with TLD had higher odds of ≥10% body weight gain at two years (adjusted odds ratio [AOR]: 1.9; 95% CI: 1.19-3.04). Other baseline factors such as age ≥40 years (AOR: 2.02; 95% CI: 1.35-3.02), weight <50kg (AOR: 3.0; 95% CI: 1.86-4.84), advanced disease stages (AOR: 1.78; 95% CI: 1.1-2.86) and ambulatory-bedridden functional status (AOR: 2.0; 95% CI: 1.05-3.8) were also associated with ≥10% weight gain.

CONCLUSION

Initiating ART with TLD was significantly associated with greater weight and BMI gain than the NNRTI-based regimens. Therefore, the cardio-metabolic implications of weight gain after the TLD initiation in this population should be monitored and thoroughly investigated.

Excessive Weight Gain: Current Antiretroviral Agents in Virologically Suppressed People with HIV

An observational cohort study was conducted with data from the Observational Pharmaco-Epidemiology Research & Analysis (OPERA) cohort to investigate weight gain among virologically suppressed people with HIV (PWH) switching to regimens containing tenofovir alafenamide/emtricitabine/(TAF/FTC). Virologically suppressed, antiretroviral therapy (ART)-experienced PWH switching to TAF/FTC with darunavir/cobicistat (DRV/c), elvitegravir/cobicistat (EVG/c), dolutegravir (DTG), or bictegravir (BIC) were selected. Cox proportional hazards models were used to assess the risk of excessive weight gain (i.e., ≥5% gain within 28 weeks or ≥10% within 54 weeks), by regimen. A linear mixed effects model with random intercept and restricted cubic splines on time was used to assess continuous changes in weight. Confounding was controlled for with both inverse probability of treatment weighting and traditional covariate adjustment. Among 5,536 PWH, 18% gained ≥5% of their weight within 28 weeks, and 9% gained ≥10% within 54 weeks. There were no differences in the risk of excessive weight gain by regimen, although there was a nonstatistically significant 20% increase in the risk of gaining ≥10% within 54 weeks with all regimens compared to DRV/c. Throughout follow-up, the mean predicted weight remained fairly constant, with no notable differentiation between regimens. Expected weight gains ranged from +0.2 to +0.3 kg at 6 months and from +0.5 to +0.6 kg at 24 months. In conclusion, in this study of virologically suppressed, ART-experienced PWH switching to regimens containing TAF/FTC and DRV/c, EVG/c, DTG, or BIC, up to 18% experienced excessive levels of weight gain. However, no statistically significant difference was observed across regimens.

Incidence of hypertension in people with HIV who are treated with integrase inhibitors versus other antiretroviral regimens in the RESPOND cohort consortium

OBJECTIVE

To compare the incidence of hypertension in people living with HIV receiving integrase strand transfer inhibitor (INSTI)-based antiretroviral therapy (ART) versus non-nucleoside reverse transcriptase inhibitors (NNRTIs) or boosted protease inhibitors (PIs) in the RESPOND consortium of HIV cohorts.

METHODS

Eligible people with HIV were aged ≥18 years who initiated a new three-drug ART regimen for the first time (baseline), did not have hypertension, and had at least two follow-up blood pressure (BP) measurements. Hypertension was defined as two consecutive systolic BP measurements ≥140 mmHg and/or diastolic BP ≥90 mmHg or initiation of antihypertensives. Multivariable Poisson regression was used to determine adjusted incidence rate ratios (aIRRs) of hypertension, overall and in those who were ART naïve or experienced at baseline.

RESULTS

Overall, 4606 people living with HIV were eligible (INSTIs 3164, NNRTIs 807, PIs 635). The median baseline systolic BP, diastolic BP, and age were 120 (interquartile range [IQR] 113-130) mmHg, 78 (70-82) mmHg, and 43 (34-50) years, respectively. Over 8380.4 person-years (median follow-up 1.5 [IQR 1.0-2.7] years), 1058 (23.0%) participants developed hypertension (incidence rate 126.2/1000 person-years, 95% confidence interval [CI] 118.9-134.1). Participants receiving INSTIs had a higher incidence of hypertension than those receiving NNRTIs (aIRR 1.76; 95% CI 1.47-2.11), whereas the incidence was no different in those receiving PIs (aIRR 1.07; 95% CI 0.89-1.29). The results were similar when the analysis was stratified by ART status at baseline.

CONCLUSION

Although unmeasured confounding and channelling bias cannot be excluded, INSTIs were associated with a higher incidence of hypertension than were NNRTIs, but rates were similar to those of PIs overall, in ART-naïve and ART-experienced participants within RESPOND.

Risks of metabolic syndrome and diabetes with integrase inhibitor-based therapy

PURPOSE OF REVIEW

A growing body of evidence suggests that integrase inhibitors (INSTIs) are significantly associated with weight gain and obesity. Obesity is a significant risk factor for metabolic syndrome and diabetes. This article comprehensively reviews recent available evidence weight gain and the risks of metabolic syndrome and diabetes associated with INSTIs.

RECENT FINDINGS

Recent evidence continues to contribute to the evidence for weight gain associated with INSTIs, especially when used with newer nucleoside reverse transcriptase inhibitor, tenofovir alafenamide (TAF). Although the literature suggests a neutral effect on lipids, there is evidence that INSTIs are associated with metabolic syndrome due to treatment-emergent obesity. The literature for short-term treatment-emergent diabetes and insulin resistance remains inconsistent, but there is some evidence that weight gain could lead to an increased risk of developing diabetes in the future.

SUMMARY

Longer term studies are required to understand the metabolic impact of INSTIs, secondary to weight gain. Evidence suggests that INSTIs, when used with TAF, contribute to metabolic syndrome and may have long-term risks of diabetes. INSTIs, when used with tenofovir disoproxil fumarate, have fewer metabolic implications. Clinicians must monitor for weight gain and metabolic effects, especially in those with underlying risk factors.

Incidence of dyslipidemia in people with HIV who are treated with integrase inhibitors versus other antiretroviral agents

OBJECTIVE

To compare the incidence of dyslipidemia in people with HIV receiving integrase inhibitors (INSTI) versus boosted protease inhibitors (PI/b) and nonnucleoside reverse transcriptase inhibitors (NNRTI) within RESPOND consortium of prospective cohorts.

METHODS

Participants were eligible if they were at least 18 years, without dyslipidemia and initiated or switched to a three-drug antiretroviral therapy (ART)-regimen consisting of either INSTI, NNRTI, or PI/b for the first time, between 1 January 2012 and 31 December 2018. Dyslipidemia was defined as random total cholesterol more than 240 mg/dl, HDL less than 35 mg/dl, triglyceride more than 200 mg/dl, or initiation of lipid-lowering therapy. Poisson regression was used to determine the adjusted incidence rate ratios. Follow-up was censored after 3 years or upon ART-regimen discontinuation or last lipid measurement or 31 December 2019, whichever occurred first.

RESULTS

Overall, 4577 people with HIV were eligible (INSTI = 66.9%, PI/b = 12.5%, and NNRTI = 20.6%), 1938 (42.3%) of whom were ART-naive. During 1.7 (interquartile range, 0.6-3.0) median years of follow-up, 1460 participants developed dyslipidemia [incidence rate: 191.6 per 1000 person-years, 95% confidence interval (CI) 182.0-201.7]. Participants taking INSTI had a lower incidence of dyslipidemia compared with those on PI/b (adjusted incidence rate ratio 0.71; CI 0.59-0.85), but higher rate compared with those on NNRTI (1.35; CI 1.15-1.58). Compared with dolutegravir, the incidence of dyslipidemia was higher with elvitegravir/cobicistat (1.20; CI 1.00-1.43) and raltegravir (1.24; CI 1.02-1.51), but lower with rilpivirine (0.77; CI 0.63-0.94).

CONCLUSION

In this large consortium of heterogeneous cohorts, dyslipidemia was less common with INSTI than with PI/b. Compared with dolutegravir, dyslipidemia was more common with elvitegravir/cobicistat and raltegravir, but less common with rilpivirine.

Risks of metabolic syndrome and diabetes with integrase inhibitor-based therapy: Republication

PURPOSE OF REVIEW

A growing body of evidence suggests that integrase inhibitors (INSTIs) are significantly associated with weight gain and obesity. Obesity is a significant risk factor for metabolic syndrome and diabetes. This article comprehensively reviews recent available evidence weight gain and the risks of metabolic syndrome and diabetes associated with INSTIs.

RECENT FINDINGS

Recent evidence continues to contribute to the evidence for weight gain associated with INSTIs, especially when used with newer nucleoside reverse transcriptase inhibitor, tenofovir alafenamide (TAF). Although the literature suggests a neutral effect on lipids, there is evidence that INSTIs are associated with metabolic syndrome due to treatment-emergent obesity. The literature for short-term treatment-emergent diabetes and insulin resistance remains inconsistent, but there is some evidence that weight gain could lead to an increased risk of developing diabetes in the future.

SUMMARY

Longer term studies are required to understand the metabolic impact of INSTIs, secondary to weight gain. Evidence suggests that INSTIs, when used with TAF, contribute to metabolic syndrome and may have long-term risks of diabetes. INSTIs, when used with tenofovir disoproxil fumarate, have fewer metabolic implications. Clinicians must monitor for weight gain and metabolic effects, especially in those with underlying risk factors.