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Immunologic disparity in the hypopituitary dwarf mouse.

R J Cross1, J S Bryson, T L Roszman

  • 1Department of Microbiology and Immunology, University of Kentucky Medical Center, Lexington 40536-0084.

Journal of Immunology (Baltimore, Md. : 1950)
|March 1, 1992
PubMed
Summary

Hypopituitary dwarf mice show delayed immune system development. However, immune competence is restored by 32 days of age, indicating a temporary lag in immunocompetence recovery.

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Area of Science:

  • Immunology
  • Endocrinology
  • Developmental Biology

Background:

  • Snell-Bagg hypopituitary dwarf mice exhibit deficiencies in growth hormone, thyroxine, and prolactin.
  • Previous studies present conflicting data on the immune competence of these dwarf mice.

Purpose of the Study:

  • To investigate the impact of weaning age and analysis time on the immune development of Snell-Bagg hypopituitary dwarf mice.
  • To determine the age at which immunocompetence is restored in these dwarf mice.

Main Methods:

  • Comparative analysis of spleen and thymus cell numbers and mitogen responsiveness in dwarf mice versus controls at different ages and weaning times.
  • Immunofluorescence analysis of V-beta TCR, CD4, and CD8 expression on thymocytes.
  • Assessment of primary antibody response to sheep red blood cells (SRBC).

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Main Results:

  • Dwarf mice weaned early (21 days) showed reduced spleen/thymus cellularity and impaired mitogen responsiveness.
  • Immune responsiveness normalized in dwarf mice weaned at 21 days if analyzed at 32 days, or if weaned later (30 days).
  • Thymocyte populations (CD4/CD8) showed distinct patterns dependent on weaning and analysis timing, with delayed maturation in early-weaned mice.

Conclusions:

  • Hypopituitary dwarf mice experience a delay in immune competence development compared to littermate controls.
  • Normal immune responsiveness is achieved by 32 days of age in dwarf mice weaned at 21 days.
  • Weaning age significantly influences the recovery of immune function in dwarf mice.