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The diabetes drug canagliflozin extends life span in male mice. Since malignant neoplasms are the major cause of death in most mouse strains, this observation suggests that canagliflozin might exert anti-neoplastic effects in male mice. Here, we treated a mouse neoplasia model, the adenoma-prone ApcMin/+ strain, with canagliflozin, to test the effects of this drug on intestinal tumor burden. Surprisingly, canagliflozin increased the total area of intestine involved by adenomas, an effect most marked in the distal intestine and in female mice. Immunohistochemical analysis suggested that canagliflozin may not influence adenoma growth via direct SGLT1/2 inhibition in neoplastic cells. Our results are most consistent with a model where canagliflozin aggravates adenoma development by altering the anatomic distribution of intestinal glucose absorption, as evidenced by increases in postprandial GLP-1 levels driven by delayed glucose absorption. We hypothesize that canagliflozin exacerbates adenomatosis in the ApcMin/+ model via complex, cell-non-autonomous mechanisms, and that sex differences in GLP-1 responses may in part underlie sexually dimorphic effects of this drug on life span.

Canagliflozin Increases Intestinal Adenoma Burden in Female ApcMin/+ Mice