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Empagliflozin improves beta cell function independently of relief of glucotoxicity in patients with type 2 diabetes: results from a randomised cross-over study with insulin as comparator

Thirumathyam R, Richter EA, van Hall G, Andersen NR, Madsen PL, Holst JJ, Madsbad S, Jørgensen NB

Diabetologia, 2026

17 participants

Abstract

Aims/hypothesis: Sodium-glucose co-transporter 2 (SGLT2) inhibitors improve beta cell function in individuals with type 2 diabetes. It has been suggested this is due to relief of glucotoxicity, but the mechanism is unknown. The objective of the present study was to evaluate the effect of the SGLT2 inhibitor empagliflozin, compared with NPH insulin treatment, on beta cell function, and, secondarily, on insulin sensitivity.

Methods: In this open-label, randomised, cross-over study, 17 individuals with non-insulin-treated type 2 diabetes were randomised to receive 5 weeks of treatment with either empagliflozin or insulin titrated to a similar level of glycaemic control as with empagliflozin before crossing over to the other treatment. Key inclusion criteria included age ≥18 years, BMI ≥ 28 kg/m2, and a diabetes duration of more than 3 months. Treatments were preceded by a 3 week washout. Fasting and post-OGTT (5 h) metabolism were studied before and during treatments. Beta cell glucose sensitivity (bGS) was calculated as the slope of the linear relationship between the pre-hepatic insulin secretion rate and the corresponding plasma glucose value, and insulin sensitivity was calculated as glucose clearance relative to insulin concentrations. Endogenous glucose production, tissue glucose disposal and lipolysis were measured using stable isotopes. The disposition index was calculated as bGS × insulin sensitivity to assess beta cell function. Data for the present study were…

How strong is the evidence?

Evidence Hub reads this as a randomized trial, done in people. Its evidence level is 3 of 5 (Moderate · trial / cohort / secondary analysis). Trials without a large randomized design, cohorts and secondary analyses give moderate evidence. Reported size: 17 participants or records.

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