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Androgens acutely increase red blood cell lifespan in hypogonadal men, but longer-term effects on erythrocyte lifespan and hemoglobin require further study. This research explores androgen impacts on erythrocyte lifespan.

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Area of Science:

  • Endocrinology
  • Hematology
  • Physiology

Background:

  • Androgens are known to increase red blood cell and hemoglobin levels.
  • The effect of androgens on erythrocyte lifespan remains largely unknown.
  • Investigating androgen effects on erythrocyte lifespan is crucial for understanding their broader physiological impact.

Purpose of the Study:

  • To determine the impact of androgens on the lifespan of immature and mature erythrocytes in humans and mice.
  • To utilize novel, minimally invasive, nonradioactive methods for assessing erythrocyte lifespan.
  • To elucidate the role of androgen receptors in regulating erythrocyte lifespan.

Main Methods:

  • Human erythrocyte lifespan was assessed using Levitt's formula (alveolar carbon monoxide and hemoglobin levels) in hypogonadal/transgender men undergoing testosterone therapy.
  • Mouse erythrocyte lifespan was measured using in vivo biotin labeling and flow cytometry to track erythrocyte and reticulocyte populations after androgen treatment or receptor inactivation.
  • Specific markers (Ter119, CD71, CD45) were used to identify and quantify reticulocytes and erythrocytes in mice.

Main Results:

  • Hypogonadal and transgender men exhibited reduced erythrocyte lifespan prior to testosterone treatment.
  • Testosterone therapy transiently increased erythrocyte lifespan in humans at 6 weeks, returning to baseline by 18 weeks, despite sustained increases in testosterone and hemoglobin.
  • Androgen treatment in mice increased erythrocyte lifespan but did not significantly affect reticulocyte lifespan; androgen receptor knockout or orchidectomy did not alter erythrocyte or reticulocyte lifespan.

Conclusions:

  • Hypogonadal men have a diminished erythrocyte lifespan.
  • The acute increase in erythrocyte lifespan following androgen administration may contribute to their known erythropoietic effects.
  • Further research is needed to ascertain the long-term contribution of androgens to increased circulating hemoglobin levels.