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Jyoti Kapali1, Brock E Kabat1, Kelly L Schmidt1

  • 1Department of Physiology (J.K., B.E.K., K.L.S., C.E.S., M.T., D.O.J., B.S.El.), Southern Illinois University, Carbondale, Illinois 62901-6523; Department of Zoology and Physiology (B.S.Ed., A.M.N.), University of Wyoming, Laramie, Wyoming 82071; and Department of Molecular and Integrative Physiology (L.B.N., L.T.R.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801.

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Forkhead box transcription factor FOXO1 is crucial for embryonic somatotrope differentiation in the pituitary gland. However, it is not essential for postnatal growth or somatotrope development after birth.

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Area of Science:

  • Endocrinology
  • Developmental Biology
  • Molecular Genetics

Background:

  • Congenital hypopituitarism etiology is often unknown, necessitating molecular diagnoses.
  • The forkhead box transcription factor FOXO1 is present in somatotropes, suggesting a potential role in their development.

Purpose of the Study:

  • To elucidate the role of FOXO1 in somatotrope differentiation and function within the anterior pituitary.

Main Methods:

  • Conditional deletion of Foxo1 in the anterior pituitary (Foxo1Δpit) of mice.
  • Analysis of progenitor cell markers (Sox2, Pou1f1) and somatotrope differentiation markers (GH, GHRH receptor).
  • Assessment of Neurod4 expression in Foxo1Δpit mice.

Main Results:

  • Foxo1 deletion did not affect progenitor cell commitment but delayed embryonic somatotrope differentiation.
  • Reduced GH and GHRH receptor expression observed in Foxo1Δpit embryos and neonates.
  • Neurod4 expression was significantly reduced in the absence of FOXO1.

Conclusions:

  • FOXO1 is essential for early embryonic somatotrope specification.
  • FOXO1 is dispensable for postnatal somatotrope expansion and overall growth in mice.