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Gender differences in protein metabolism.

K D Tipton1

  • 1Department of Surgery, University of Texas Medical Branch, Metabolism Unit, Shriner's Hospital for Children - Galveston, Galveston, Texas 77550, USA. ktipton@utmb.edu

Current Opinion in Clinical Nutrition and Metabolic Care
|November 14, 2001
PubMed
Summary
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Gender differences in human protein metabolism are subtle, with sex hormones like testosterone likely driving greater muscle mass in males. Further research is needed to clarify these protein metabolism variations.

Area of Science:

  • Physiology
  • Endocrinology
  • Nutritional Science

Background:

  • Adult males and females exhibit distinct muscle mass, suggesting potential gender-based differences in substrate and protein metabolism.
  • Existing research on whole-body protein synthesis and breakdown shows minimal gender-based variations.

Purpose of the Study:

  • To investigate potential gender differences in human protein metabolism, particularly concerning muscle protein synthesis and breakdown.
  • To explore the role of sex hormones in mediating observed differences in muscle mass and protein metabolism between males and females.

Main Methods:

  • Utilized stable isotopically labeled amino acids to assess whole-body protein synthesis and breakdown.
  • Examined leucine oxidation rates at rest and during exercise.

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  • Reviewed existing literature on sex hormone influence (testosterone, ovarian hormones) on muscle protein metabolism.

    • Main Results:

    • Whole-body protein synthesis and breakdown show no significant gender differences.
    • Leucine oxidation may differ between genders, but evidence is inconclusive and requires further investigation.
    • Sex hormones, particularly the pubertal surge in testosterone in males, are strongly implicated in greater muscle mass and potentially altered protein metabolism.

    Conclusions:

    • While whole-body protein metabolism shows few gender differences, sex hormones likely play a crucial role in the development of distinct male and female musculature.
    • Further controlled studies are essential to fully elucidate gender-specific protein metabolism and its contribution to physiological differences.