title: Early-onset type 2 diabetes impairs skeletal acquisition in the male TALLYHO/JngJ mouse.
abstract: Type 2 diabetes (T2D) incidence in adolescents is rising and may interfere with peak bone mass acquisition. We tested the effects of early-onset T2D on bone mass, microarchitecture, and strength in the TALLYHO/JngJ mouse, which develops T2D by 8 weeks of age. We assessed metabolism and skeletal acquisition in male TALLYHO/JngJ and SWR/J controls (n = 8-10/group) from 4 weeks to 8 and 17 weeks of age. Tallyho mice were obese; had an approximately 2-fold higher leptin and percentage body fat; and had lower bone mineral density vs SWR at all time points (P < .03 for all). Tallyho had severe deficits in distal femur trabecular bone volume fraction (-54%), trabecular number (-27%), and connectivity density (-82%) (P < .01 for all). Bone formation was higher in Tallyho mice at 8 weeks but lower by 17 weeks of age vs SWR despite similar numbers of osteoblasts. Bone marrow adiposity was 7- to 50-fold higher in Tallyho vs SWR. In vitro, primary bone marrow stromal cell differentiation into osteoblast and adipocyte lineages was similar in SWR and Tallyho, suggesting skeletal deficits were not due to intrinsic defects in Tallyho bone-forming cells. These data suggest the Tallyho mouse might be a useful model to study the skeletal effects of adolescent T2D.
authors: Department of Anthropology (M.J.D.), University of Michigan, Ann Arbor, Michigan 48104; Center for Advanced Orthopedic Studies (M.J.D., M.V.V., L.K., D.J.B., L.L., C.C., M.L.B.), Beth Israel Deaconess Medical Center, and Harvard Medical School (M.L.B.), Boston, Massachusetts 02215; and Maine Medical Center Research Institute (K.M., C.J.R.), Scarborough, Maine 04074.
authors: M J
authors: MJ
authors: Devlin
authors: M
authors: M
authors: Van Vliet
authors: K
authors: K
authors: Motyl
authors: L
authors: L
authors: Karim
authors: D J
authors: DJ
authors: Brooks
authors: L
authors: L
authors: Louis
authors: C
authors: C
authors: Conlon
authors: C J
authors: CJ
authors: Rosen
authors: M L
authors: ML
authors: Bouxsein
mesh_terms: D000367:Age Factors; D017668:Age of Onset; D000818:Animals; D015519:Bone Density / Q000187:drug effects / Q000235:genetics; D001846:Bone Development / Q000187:drug effects / Q000235:genetics; D002478:Cells, Cultured; D003921:Diabetes Mellitus, Experimental / Q000235:genetics / Q000503:physiopathology; D003924:Diabetes Mellitus, Type 2 / Q000235:genetics / Q000503:physiopathology*; D059305:Diet, High-Fat; D019422:Dietary Sucrose / Q000494:pharmacology; D008297:Male; D051379:Mice; D008817:Mice, Mutant Strains; D008820:Mice, Obese; D010012:Osteogenesis / Q000502:physiology
chemical_list: D019422:Dietary Sucrose