Abstract
Background
Glucocorticoids are involved in the regulation of metabolic, immunological, and developmental processes. Their synthesis is tightly controlled by feedback regulation through the hypothalamus-pituitary-adrenal (HPA) axis, allowing the organism to respond to stress in an adequate manner and to adapt to new situations. Disturbance of these regulatory mechanisms leads to major human diseases. By generating mice with a targeted mutation in the glucocorticoid receptor (GR) locus, it was possible to analyze the mechanism by which glucocorticoids control the HPA axis, under conditions where at least part of the feedback control was absent early in development.
Materials and Methods
RNase-protection and in situ hybridization assays were used to compare messenger RNA (mRNA) levels of genes involved in the control of the HPA axis in both GR-mutant and wild-type animals.
Results
Negative feedback regulation of the HPA axis by glucocorticoids, which is established around Day E16.5 of embryonic development in wild-type mice, does not occur in GR-mutants, resulting in an increased expression of proopiomelanocortin mRNA in the anterior lobe of the pituitary and of corticotropin-releasing hormone mRNA in the paraventricular nucleus of the hypothalamus. However, the expression of both arginine vasopressin and mineralocorticoid receptor in the brain is not affected. In the neurointermediate lobe of the pituitary, expression of the proopiomelanocortin gene was inversely regulated, compared with its expression in the anterior lobe.
Conclusions
GR-dependent regulation of the HPA axis is established during fetal development, suggesting that maternal factors have an important role in influencing the HPA axis of the adult offspring.
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Acknowledgments
We would like to thank Dagmar Bock and Anja Schwäger for expert technical assistance and Werner Fleischer for oligonucleotide synthesis and photographical artwork. We are grateful to Drs. Klaus H. Kaestner, A. Paula Monaghan, and Wolfgang Schmid for helpful discussions, and to Dr. Klaus H. Kaestner for critical reading of the manuscript. This work was supported by the Deutsche Forschungsgemeinschaft through SFB 229, the Fonds der Chemischen Industrie, the BMFT project 0310681, and European Community Grant BI02-CT93-0319.
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Reichardt, H.M., Schütz, G. Feedback Control of Glucocorticoid Production is Established during Fetal Development. Mol Med 2, 735–744 (1996). https://doi.org/10.1007/BF03401657
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DOI: https://doi.org/10.1007/BF03401657