High metabolic substrate load induces mitochondrial dysfunction in rat skeletal muscle microvascular endothelial cells

被引:7
|
作者
Hansen, Camilla [1 ]
Olsen, Karina [1 ]
Pilegaard, Henriette [2 ]
Bangsbo, Jens [3 ]
Gliemann, Lasse [1 ]
Hellsten, Ylva [1 ]
机构
[1] Univ Copenhagen, Sect Integrat Physiol, Cardiovasc Physiol Grp, Dept Nutr Exercise & Sports, Univ Parken 13, DK-2100 Copenhagen, Denmark
[2] Univ Copenhagen, Sect Cell Biol & Physiol, Dept Biol, Copenhagen, Denmark
[3] Univ Copenhagen, Sect Integrat Physiol, Dept Nutr Exercise & Sports, Copenhagen, Denmark
来源
PHYSIOLOGICAL REPORTS | 2021年 / 9卷 / 14期
关键词
glucose; mitochondria; palmitic acid; reactive oxygen species; respirometry; vascular; FATTY-ACID; INSULIN-RESISTANCE; OXIDATIVE STRESS; VASCULAR FUNCTION; NITRIC-OXIDE; RESPIRATION; SUPPLEMENTATION; SYNTHASE; EXPOSURE; GROWTH;
D O I
10.14814/phy2.14855
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
The influence of glucose and palmitic acid (PA) on mitochondrial respiration and emission of hydrogen peroxide (H2O2) was determined in skeletal muscle-derived microvascular endothelial cells. Measurements were assessed in intact and permeabilized (cells treated with 0.025% saponin) low passage endothelial cells with acute-or prolonged (3 days) incubation with regular (1.7 mM) or elevated (2.2 mM) PA concentrations and regular (5 mM) or elevated (11 mM) glucose concentrations. In intact cells, acute incubation with 1.7 mM PA alone or with 1.7 mM PA + 5 mM glucose (p < .001) led to a lower mitochondrial respiration (p < 0.01) and markedly higher H2O2/O-2 emission (p < 0.05) than with 5 mM glucose alone. Prolonged incubation of intact cells with 1.7 mM PA +5 mM glucose led to 34% (p < 0.05) lower respiration and 2.5-fold higher H2O2/O-2 emission (p < 0.01) than incubation with 5 mM glucose alone. Prolonged incubation of intact cells with elevated glucose led to 60% lower (p < 0.05) mitochondrial respiration and 4.6-fold higher H2O2/O-2 production than incubation with 5 mM glucose in intact cells (p < 0.001). All effects observed in intact cells were present also in permeabilized cells (State 2). In conclusion, our results show that acute and prolonged lipid availability, as well as prolonged hyperglycemia, induces mitochondrial dysfunction as evidenced by lower mitochondrial respiration and enhanced H2O2/O2 emission. Elevated plasma substrate availability may lead to microvascular dysfunction in skeletal muscle by impairing endothelial mitochondrial function.
引用
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页数:17
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