ArticleEndocrinology2025
Interaction of B0AT1 Deficiency and Diet on Metabolic Function and Diabetes Incidence in Male Nonobese Diabetic Mice.
Article in Endocrinology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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8 authors.
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Abstract
contextThe obesity epidemic parallels an increasing type 1 diabetes incidence, such that westernized diets, containing high fat, sugar, and/or protein, through inducing nutrient-induced islet β-cell stress, have been proposed as contributing factors. The broad-spectrum neutral amino acid transporter (B0AT1), encoded by Slc6a19, is the major neutral amino acids transporter in intestine and kidney. B0AT1 deficiency in C567Bl/6J mice causes aminoaciduria, lowers insulinemia, and improves glucose tolerance.
objectiveWe investigated the effects of standard rodent chow (chow), high-fat high-sucrose (HFHS), and high-fat high-protein (HFHP) diets, in addition to B0AT1 deficiency, on the diabetes incidence of male nonobese diabetic (NOD/ShiLtJArc (NOD)) mice.
methodsMale NOD.Slc6a19+/+ and NOD.Slc6a19-/- mice were fed chow, HFHS and HFHP diets from 6 to 24 weeks of age. A separate cohort of male NOD mice were fed the three diets from 6-30 weeks of age. Body weight and fed-state blood glucose and plasma insulin were monitored, and urinary amino-acid profiles, intraperitoneal glucose tolerance, diabetes incidence, pancreatic islet number, insulitis scores and beta-cell mass were measured.
resultsThe incidence of diabetes and severe glucose intolerance was 3.8% in HFHS-fed, 25.0% in HFHP-fed, and 14.7% in chow-fed mice, with higher pancreatic islet number and lower insulitis scores in HFHS-fed mice. B0AT1 deficiency had no effect on diabetes incidence, but curtailed HFHS-induced excessive weight gain, adipose tissue expansion, and hyperinsulinemia. In HFHP-fed mice, B0AT1 deficiency significantly increased pancreatic β-cell clusters and small islets. Male NOD mice that did not develop autoimmune diabetes were resistant to diet-induced hyperglycemia.
conclusionDietary composition does, but B0AT1 deficiency does not, affect autoimmune diabetes incidence in male NOD mice. B0AT1 deficiency, however, reduces diet-induced metabolic dysfunction and in HFHP-fed mice increases pancreatic β-cell clusters and small islets.
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