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Pax6 is implicated in murine pituitary endocrine function.
C A Bentley1, M P Zidehsarai, J C Grindley
1Department of Reproductive Medicine, University of California-San Diego, La Jolla, USA. cbentley@ucsd.edu
Endocrine
|August 18, 1999
Summary
Pax6 is crucial for pituitary endocrine function, not differentiation. This transcription factor regulates growth hormone (GH) and prolactin (PRL) levels in neonatal mice, impacting hormone homeostasis.
Area of Science:
- Developmental biology
- Endocrinology
- Genetics
Background:
- Pax6 is an evolutionarily conserved transcription factor.
- Its role in pituitary development and endocrine function is largely unknown.
- Pax6 is expressed in the embryonic pituitary of mice and zebrafish.
Purpose of the Study:
- To investigate the in vivo role of Pax6 in pituitary development and endocrine function.
- To determine if Pax6 is essential for pituitary differentiation or hormone regulation.
Main Methods:
- Analysis of Pax6 mutant mouse (SeyNeu) pituitaries.
- Examination of peptide hormone and developmental marker expression in embryonic pituitaries.
- Measurement of serum growth hormone (GH) and prolactin (PRL) levels in mutant and wild-type mice.
Main Results:
- Pax6 mutant pituitaries showed decreased GH- and PRL-immunopositive cells, despite present mRNA expression.
- Pituitary cell types differentiated in mutant embryos, suggesting Pax6 is not essential for differentiation.
- Pax6 mutant mice exhibited significantly lower serum GH levels compared to controls.
- PRL serum levels were below detection limits in both groups.
Conclusions:
- Pax6 is not essential for pituitary differentiation.
- Pax6 plays a critical role in establishing appropriate neonatal homeostatic levels of GH and PRL.
- Pax6 may regulate hormone levels through translational or secretory mechanisms.