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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
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Sex differences in constitutive autophagy.

Sara Oliván1, Ana Cristina Calvo1, Raquel Manzano1

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This study reveals significant sex differences in constitutive autophagy within mouse spinal cord and skeletal muscle. Understanding these sex-specific variations in autophagy markers is crucial for reducing bias in biomedical research.

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Area of Science:

  • Autophagy research
  • Cellular biology
  • Neuroscience

Background:

  • Sex bias is a recognized issue in biomedical research using animal models.
  • Sexual dimorphism is well-established in both physiological and pathological conditions.

Purpose of the Study:

  • To investigate sex differences in constitutive autophagy.
  • To analyze autophagy markers in spinal cord and skeletal muscle tissues of wild-type mice.

Main Methods:

  • Extraction of mRNA and proteins from male and female mouse tissues.
  • Analysis of autophagy markers microtubule-associated protein 1 light chain 3 (LC3) and sequestosome 1 (p62).
  • Assessment at multiple ages (40, 60, 90, and 120 days).

Main Results:

  • Significant sex differences were observed in the expression of LC3 and p62.
  • These differences were present in both spinal cord and skeletal muscle tissues.
  • Autophagy showed distinct sex and tissue-specific patterns.

Conclusions:

  • Constitutive autophagy exhibits significant sex and tissue-specific differences in mice.
  • The findings highlight the necessity of including both sexes in experimental designs.
  • Minimizing sex bias in research requires accounting for these biological variations.