“…These findings support the results from studies 10,12 demonstrating more marked (although not significantly so) islet morphological changes in pancreatic biopsies of patients treated with tacrolimus, and reduced insulin secretion release from isolated human islets, and contribute to the understanding of the clinical observation that new-onset diabetes after transplantation is more common when this immunosuppressant is used. [1][2][3] In fact, after transplantation, insulin secretion dysfunction, rather than insulin resistance, plays a major causative role in new-onset diabetes. 15,16 The effects of calcineurin inhibitors on b-cells are not surprising, since the calcineurin/NFAT signaling pathway has been described in these cells, and is important in b-cell function and turnover.…”