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Torres 2018 Cell Metab

From Bioblast
Publications in the MiPMap
Torres MJ, Kew KA, Ryan TE, Pennington ER, Lin CT, Buddo KA, Fix AM, Smith CA, Gilliam LA, Karvinen S, Lowe DA, Spangenburg EE, Zeczycki TN, Shaikh SR, Neufer PD (2018) 17ฮฒ-estradiol directly lowers mitochondrial membrane microviscosity and improves bioenergetic function in skeletal muscle. Cell Metab 27:167-79. https://doi.org/10.1016/j.cmet.2017.10.003

ยป PMID: 29103922

Torres MJ, Kew KA, Ryan TE, Pennington ER, Lin CT, Buddo KA, Fix AM, Smith CA, Gilliam LA, Karvinen S, Lowe DA, Spangenburg EE, Zeczycki TN, Shaikh SR, Neufer PD (2018) Cell Metab

Abstract: Menopause results in a progressive decline in 17ฮฒ-estradiol (E2) levels, increased adiposity, decreased insulin sensitivity, and a higher risk for type 2 diabetes. Estrogen therapies can help reverse these effects, but the mechanism(s) by which E2 modulates susceptibility to metabolic disease is not well understood. In young C57BL/6N mice, short-term ovariectomy decreased-whereas E2 therapy restored-mitochondrial respiratory function, cellular redox state (GSH/GSSG), and insulin sensitivity in skeletal muscle. E2 was detected by liquid chromatography-mass spectrometry in mitochondrial membranes and varied according to whole-body E2 status independently of ERฮฑ. Loss of E2 increased mitochondrial membrane microviscosity and H2O2 emitting potential, whereas E2 administration in vivo and in vitro restored membrane E2 content, microviscosity, complex I and I + III activities, H2O2 emitting potential, and submaximal OXPHOS responsiveness. These findings demonstrate that E2 directly modulates membrane biophysical properties and bioenergetic function in mitochondria, offering a direct mechanism by which E2 status broadly influences energy homeostasis. โ€ข Keywords: Estrogen, Hormone replacement therapy, Hydrogen peroxide, Insulin resistance, Membrane viscosity, Menopause, Mitochondria, Ovariectomy, Buffer Z, Blebbistatin, Amplex UltraRed โ€ข Bioblast editor: Kandolf G โ€ข O2k-Network Lab: US NC Greenville Neufer PD

Torres 2017 Cell Metab CORRECTION.png

Correction: FADH2 and S-pathway

FADH2 is shown as the substrate feeding electrons into the membrane-ETS in the S-pathway. This requires correction: "Whereas reduced NADH is a substrate of Complex I linked to dehydrogenases of the TCA cycle and mt-matrix upstream of CI, reduced FADH2 is a product of Complex II with downstream electron flow from CII to Q" (page 48 in Ref [1]. For details see Ref [2].
  1. Gnaiger E (2020) Mitochondrial pathways and respiratory control. An introduction to OXPHOS analysis. 5th ed. Bioenerg Commun 2020.2. https://doi.org/10.26124/bec:2020-0002
  2. Gnaiger E (2023) Complex II ambiguities โ€• FADH2 in the electron transfer system. MitoFit Preprints 2023.3.v4. https://doi.org/10.26124/mitofit:2023-0003.v4


Labels: MiParea: Respiration, mt-Medicine, Pharmacology;toxicology  Pathology: Diabetes 

Organism: Mouse  Tissue;cell: Skeletal muscle  Preparation: Permeabilized tissue 


Coupling state: LEAK, OXPHOS, ET  Pathway: F, N, S, CIV, NS, ROX  HRR: Oxygraph-2k 

2018-01