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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy
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Sex differences in mitochondrial (dys)function: Implications for neuroprotection.

Tyler G Demarest1, Margaret M McCarthy

  • 1Program in Neuroscience, University of Maryland School of Medicine, Baltimore, MD, USA, tdemarest@anes.umm.edu.

Journal of Bioenergetics and Biomembranes
|October 9, 2014
PubMed
Summary
This summary is machine-generated.

Sex differences in brain injury response are linked to mitochondrial fuel use. Males use protein, females use lipids, impacting cell survival and neuroprotection strategies.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Cell Biology

Background:

  • Sex differences in brain structure, connectivity, and metabolism are well-documented.
  • Neurobehavioral and cognitive outcomes after central nervous system (CNS) injury show sex-based variations.
  • Gonadal hormones, chromosomal makeup, and hormonal fluctuations contribute to these sex differences.

Purpose of the Study:

  • To review evidence on sex differences in mitochondrial function and cell death signaling in CNS injury.
  • To explore how distinct mitochondrial fuel utilization in males and females impacts cellular survival.
  • To discuss implications for developing sex-specific neuroprotective therapies.

Main Methods:

  • Literature review of studies investigating sex differences in CNS injury.
  • Analysis of research on mitochondrial metabolism and cell death pathways.
  • Examination of evidence on fuel utilization (protein vs. lipid) in male and female brain mitochondria.

Main Results:

  • Mitochondrial metabolism and cell death signaling are sexually dimorphic.
  • Males predominantly use proteins, while females predominantly use lipids as mitochondrial fuel.
  • These metabolic differences significantly influence cellular survival following CNS injury.

Conclusions:

  • Fundamental biochemical sex differences in mitochondrial fuel utilization impact CNS injury outcomes.
  • Understanding these dimorphisms is crucial for advancing neuroprotective therapy development.
  • Future research should consider sex as a biological variable in CNS injury and treatment strategies.