title: Dual Actions of Apolipoprotein A-I on Glucose-Stimulated Insulin Secretion and Insulin-Independent Peripheral Tissue Glucose Uptake Lead to Increased Heart and Skeletal Muscle Glucose Disposal.
abstract: Apolipoprotein A-I (apoA-I) of HDL is central to the transport of cholesterol in circulation. ApoA-I also provides glucose control with described in vitro effects of apoA-I on β-cell insulin secretion and muscle glucose uptake. In addition, apoA-I injections in insulin-resistant diet-induced obese (DIO) mice lead to increased glucose-stimulated insulin secretion (GSIS) and peripheral tissue glucose uptake. However, the relative contribution of apoA-I as an enhancer of GSIS in vivo and as a direct stimulator of insulin-independent glucose uptake is not known. Here, DIO mice with instant and transient blockade of insulin secretion were used in glucose tolerance tests and in positron emission tomography analyses. Data demonstrate that apoA-I to an equal extent enhances GSIS and acts as peripheral tissue activator of insulin-independent glucose uptake and verify skeletal muscle as an apoA-I target tissue. Intriguingly, our analyses also identify the heart as an important target tissue for the apoA-I-stimulated glucose uptake, with potential implications in diabetic cardiomyopathy. Explorations of apoA-I as a novel antidiabetic drug should extend to treatments of diabetic cardiomyopathy and other cardiovascular diseases in patients with diabetes.
authors.affiliation: Department of Experimental Medical Science, Lund University, Lund, Sweden.
authors.forename: Joan
authors.initials: J
authors.lastname: Domingo-Espín
authors.affiliation: Department of Experimental Medical Science, Lund University, Lund, Sweden.
authors.forename: Maria
authors.initials: M
authors.lastname: Lindahl
authors.affiliation: Department of Experimental Medical Science, Lund University, Lund, Sweden.
authors.forename: Oktawia
authors.initials: O
authors.lastname: Nilsson-Wolanin
authors.affiliation: Department of Experimental Medical Science, Lund University, Lund, Sweden.
authors.forename: Samuel W
authors.initials: SW
authors.lastname: Cushman
authors.affiliation: Department of Experimental Medical Science, Lund University, Lund, Sweden.
authors.forename: Karin G
authors.initials: KG
authors.lastname: Stenkula
authors.affiliation: Department of Experimental Medical Science, Lund University, Lund, Sweden jens.lagerstedt@med.lu.se.
authors.forename: Jens O
authors.initials: JO
authors.lastname: Lagerstedt
mesh_terms: D000818:Animals; D016632:Apolipoprotein A-I / Q000494:pharmacology*; D001692:Biological Transport / Q000187:drug effects; D005947:Glucose / Q000378:metabolism / Q000494:pharmacology*; D006321:Heart / Q000187:drug effects*; D007328:Insulin / Q000378:metabolism*; D000078790:Insulin Secretion; D051379:Mice; D018482:Muscle, Skeletal / Q000187:drug effects* / Q000378:metabolism; D009206:Myocardium / Q000378:metabolism*; D009765:Obesity / Q000378:metabolism*; D015398:Signal Transduction / Q000187:drug effects
chemical_list: D016632:Apolipoprotein A-I; D007328:Insulin; D005947:Glucose