Free fatty acid and glucose metabolism in human aging: evidence for operation of the Randle cycle.

Free fatty acid and glucose metabolism in human aging: evidence for operation of the Randle cycle.
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人类衰老中的游离脂肪酸和葡萄糖代谢:兰德尔循环运作的证据。

DOI:
10.1152/ajpendo.1994.266.3.e501
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发表时间:
1994
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
DeFronzo,RA
DeFronzo,RA
中科院分区:
--
文献类型:
--
作者:
Bonadonna,RC;Groop,LC;Simonson,DC;DeFronzo,RA

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我们通过在五个胰岛素剂量下进行连续的正常血糖钳夹,评估了胰岛素对七名老年人(71 +/- 2岁)和七名年轻(21 +/- 1岁)受试者血浆游离脂肪酸(FFA)和葡萄糖代谢的影响,这些受试者与体重和体重指数相匹配,但不与体脂百分比相匹配(老年人为32.4 +/- 3.8%,年轻人为20.4 +/- 3.5%,P < 0.05) (0.6、1.5、3、6 和 15 pmol.min-1.kg-1)与间接量热法和 [1-14C] 棕榈酸酯加 [3-3H] 葡萄糖输注相结合。基线时,血浆 FFA 浓度、输注周转率。基线时,老年人的血浆FFA浓度、周转和氧化以及总脂质氧化均增加(897 +/- 107 vs. 412 +/- 50 mumol/l,11.2 +/- 1.4 vs. 5.14 +/- 0.86,3.45 +/- 0.65 vs. 1.37 +/- 0.25,4.63 +/- 0.72 vs. 1.37 +/- 0.72)。 3.01 +/- 0.33 mumol.min-1.kg-1 去脂体重,所有比较的 P < 0.05),而由于葡萄糖氧化减少(8.2 +/- 1.4 与 13 +/- 1.9 mumol.min-1.kg-1 去脂体重,P < 0.05)和葡萄糖储存增加(6.6 +/- 1.4 与 1.7 +/-),葡萄糖周转率相似1.3 mmol.min-1.kg-1 去脂体重,P < 0.05)。在所有胰岛素输注中,老年人的血浆FFA浓度、周转和氧化以及总脂质氧化均高于年轻组(P < 0.05)。然而,如果按脂肪量标准化,则两组的所有 FFA 和脂质代谢通量,无论是在吸收后状态还是在高胰岛素血症期间,都是相当的。(摘要截短为 250 字)
We assessed insulin effects on plasma free fatty acid (FFA) and glucose metabolism in seven elderly (71 +/- 2 yr) and in seven younger (21 +/- 1 yr) subjects matched for body weight and body mass index but not for percent body fat (32.4 +/- 3.8% in elderly vs. 20.4 +/- 3.5% in young, P < 0.05), by performing sequential euglycemic clamps at five insulin doses (0.6, 1.5, 3, 6, and 15 pmol.min-1.kg-1) in combination with indirect calorimetry and [1-14C]palmitate plus [3-3H]glucose infusion. At baseline, plasma FFA concentration, turnover infusion. At baseline, plasma FFA concentration, turnover and oxidation, and total lipid oxidation were all increased in the elderly (897 +/- 107 vs. 412 +/- 50 mumol/l and 11.2 +/- 1.4 vs. 5.14 +/- 0.86, 3.45 +/- 0.65 vs. 1.37 +/- 0.25, and 4.63 +/- 0.72 vs. 3.01 +/- 0.33 mumol.min-1.kg-1 lean body mass, P < 0.05 for all comparisons), whereas glucose turnover was similar as a result of decreased glucose oxidation (8.2 +/- 1.4 vs. 13 +/- 1.9 mumol.min-1.kg-1 lean body mass, P < 0.05) and increased glucose storage (6.6 +/- 1.4 vs. 1.7 +/- 1.3 mmol.min-1.kg-1 lean body mass, P < 0.05). At all insulin infusions, plasma FFA concentration, turnover and oxidation, and total lipid oxidation were higher in the elderly than in the younger group (P < 0.05). However, if normalized per fat mass, all FFA and lipid metabolic fluxes, both in the postabsorptive state and during hyperinsulinemia, were comparable in the two groups.(ABSTRACT TRUNCATED AT 250 WORDS)
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