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However, various studies have demonstrated that the adipocyte-derived hormone leptin can robustly lower blood glucose levels in rodent models of insulin-deficient diabetes. In addition, it has been suggested that some of the metabolic manifestations of insulin-deficient diabetes are due to hypoleptinemia as opposed to hypoinsulinemia. Because insulin therapy increases leptin levels, we sought to investigate the contribution of leptin to the beneficial effects of insulin therapy. To do this, we tested insulin therapy in streptozotocin (STZ) diabetic mice that were either on an ob\/ ob background or that were given a leptin antagonist to determine if blocking leptin action would blunt the glucose-lowering effects of insulin therapy. We found that STZ diabetic ob\/ ob mice have a diminished blood glucose-lowering effect in response to insulin therapy compared with STZ diabetic controls and exhibited more severe weight loss post-STZ injection. In addition, STZ diabetic mice administered a leptin antagonist through daily injection or plasmid expression respond less robustly to insulin therapy as assessed by both fasting blood glucose levels and blood glucose levels during an oral glucose tolerance test. However, leptin antagonism did not prevent the insulin-induced reduction in \u03b2-hydroxybutyrate and triglyceride levels. Therefore, we conclude that elevated leptin levels can contribute to the glucose-lowering effect of insulin therapy in insulin-deficient diabetes.<\/jats:p>","DOI":"10.1152\/ajpendo.00159.2018","type":"journal-article","created":{"date-parts":[[2018,10,9]],"date-time":"2018-10-09T16:49:47Z","timestamp":1539103787000},"page":"E1264-E1273","source":"Crossref","is-referenced-by-count":2,"title":["Leptin contributes to the beneficial effects of insulin treatment in streptozotocin-diabetic male mice"],"prefix":"10.1152","volume":"315","author":[{"given":"Ursula H.","family":"Neumann","sequence":"first","affiliation":[{"name":"Department of Cellular and Physiological Sciences, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michelle M.","family":"Kwon","sequence":"additional","affiliation":[{"name":"Department of Cellular and Physiological Sciences, Life Sciences Institute, 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