Postprandial Hypoglycemia in Patients after Gastric Bypass Surgery Is Mediated by Glucose-Induced IL-1β

Postprandial hypoglycemia is a disabling complication of the treatment of obesity by gastric bypass surgery. So far, no therapy exists, and the underlying mechanisms remain unclear. Here, we hypothesized that glucose-induced IL-1β leads to an exaggerated insulin response in this condition. Therefore, we conducted a placebo-controlled, randomized, double-blind, crossover study with the SGLT2-inhibitor empagliflozin and the IL-1 receptor antagonist anakinra (clinicaltrials.govNCT03200782; n = 12). Both drugs reduced postprandial insulin release and prevented hypoglycemia (symptomatic events requiring rescue glucose: placebo = 7/12, empagliflozin = 2/12, and anakinra = 2/12, pval_{likelihood ratio test (LRT)} = 0.013; nadir blood glucose for placebo = 2.4 mmol/L, 95% CI 2.18-2.62, empagliflozin = 2.69 mmol/L, 95% CI 2.31-3.08, and anakinra = 2.99 mmol/L, 95% CI 2.43-3.55, pval_LRT = 0.048). Moreover, analysis of monocytes ex vivo revealed a hyper-reactive inflammatory state that has features of an exaggerated response to a meal. Our study proposes a role for glucose-induced IL-1β in postprandial hypoglycemia after gastric bypass surgery and suggests that SGLT2-inhibitors and IL-1 antagonism may improve this condition.