Kane 2011 Am J Physiol Endocrinol Metab
| Kane DA, Lin CT, Anderson EJ, Kwak HB, Cox JH, Brophy PM, Hickner RC, Neufer PD, Cortright RN (2010) Progesterone Increases Skeletal Muscle Mitochondrial H2O2 Emission in Non-Menopausal Women. Am. J. Physiol. Endocrinol. Metab. [Epub ahead of print] |
» http://www.ncbi.nlm.nih.gov/pubmed/21189359
Kane DA, Lin CT, Anderson EJ, Kwak HB, Cox JH, Brophy PM, Hickner RC, Neufer PD, Cortright RN (2010) Am. J. Physiol. Endocrinol. Metab.
Abstract: The luteal phase of the female menstrual cycle is associated with both 1) elevated serum progesterone (P4) and estradiol (E2), and 2) reduced insulin sensitivity. Recently, we demonstrated a link between skeletal muscle mitochondrial H2O2 emission (mEH2O2) and insulin resistance. To determine whether serum levels of P4 and/or E2 are related to mitochondrial function, mEH2O2 and respiratory O2 flux (JO2) were measured in permeabilized myofibers from insulin sensitive (IS, n = 24) and resistant (IR, n = 7) non-menopausal women (IR = HOMA-IR > 3.6). Succinate-supported mEH2O2 was more than 50% greater in the IR vs. IS women (P < 0.05). Interestingly, serum P4 correlated positively with succinate-supported mEH2O2 (r = 0. 53; (P < 0.01). To determine whether P4 or E2 directly affect mitochondrial function, saponin-permeabilized vastus lateralis myofibers biopsied from 5 non-menopausal women in the early follicular phase were incubated in P4 (60 nM), E2 (1.4 nM), or both. P4 alone inhibited state 3 JO2 supported by multisubstrate combination ((P < 0.01). However, E2 alone or in combination with P4 had no effect on JO2. In contrast, during state 4 respiration supported by succinate and glycerophosphate, mEH2O2 was increased with P4 alone or in combination with E2 (P < 0.01). The results suggest that 1) P4 increases mEH2O2 with or without E2; 2) P4 alone inhibits JO2, but not when E2 is present; and 3) P4 is related to the mEH2O2 previously linked to skeletal muscle insulin resistance. • Keywords: Sex Hormones, Estradiol, Insulin Resistance, Oxidative Stress
• O2k-Network Lab: US NC-Greenville Neufer PD
Labels:
Stress:RONS; Oxidative Stress"RONS; Oxidative Stress" is not in the list (Cell death, Cryopreservation, Ischemia-reperfusion, Permeability transition, Oxidative stress;RONS, Temperature, Hypoxia, Mitochondrial disease) of allowed values for the "Stress" property. Organism: Human Tissue;cell: Skeletal Muscle"Skeletal Muscle" is not in the list (Heart, Skeletal muscle, Nervous system, Liver, Kidney, Lung;gill, Islet cell;pancreas;thymus, Endothelial;epithelial;mesothelial cell, Blood cells, Fat, ...) of allowed values for the "Tissue and cell" property. Preparation: Intact Organism"Intact Organism" is not in the list (Intact organism, Intact organ, Permeabilized cells, Permeabilized tissue, Homogenate, Isolated mitochondria, SMP, Chloroplasts, Enzyme, Oxidase;biochemical oxidation, ...) of allowed values for the "Preparation" property., Permeabilized Cell or Tissue; Homogenate"Permeabilized Cell or Tissue; Homogenate" is not in the list (Intact organism, Intact organ, Permeabilized cells, Permeabilized tissue, Homogenate, Isolated mitochondria, SMP, Chloroplasts, Enzyme, Oxidase;biochemical oxidation, ...) of allowed values for the "Preparation" property.
Regulation: Respiration; OXPHOS; ETS Capacity"Respiration; OXPHOS; ETS Capacity" is not in the list (Aerobic glycolysis, ADP, ATP, ATP production, AMP, Calcium, Coupling efficiency;uncoupling, Cyt c, Flux control, Inhibitor, ...) of allowed values for the "Respiration and regulation" property.
HRR: Oxygraph-2k, Spectrophotometry; Spectrofluorimetry"Spectrophotometry; Spectrofluorimetry" is not in the list (Oxygraph-2k, TIP2k, O2k-Fluorometer, pH, NO, TPP, Ca, O2k-Spectrophotometer, O2k-Manual, O2k-Protocol, ...) of allowed values for the "Instrument and method" property., Chemicals; Media"Chemicals; Media" is not in the list (Oxygraph-2k, TIP2k, O2k-Fluorometer, pH, NO, TPP, Ca, O2k-Spectrophotometer, O2k-Manual, O2k-Protocol, ...) of allowed values for the "Instrument and method" property., Method"Method" is not in the list (Oxygraph-2k, TIP2k, O2k-Fluorometer, pH, NO, TPP, Ca, O2k-Spectrophotometer, O2k-Manual, O2k-Protocol, ...) of allowed values for the "Instrument and method" property.
