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Implications of multiple phenotypes observed in prolactin receptor knockout mice
1INSERM Unité 344-Endocrinologie Moléculaire, Faculté de Médecine Necker, 156 rue de Vaugirard, Paris Cedex, 75730, France. kelly@necker.fr
Frontiers in Neuroendocrinology
|March 22, 2001
Summary
Creating a prolactin receptor knockout mouse model revealed its critical roles. These mice exhibit infertility, impaired lactation, altered maternal behavior, and reduced bone formation, highlighting prolactin signaling importance.
Area of Science:
- Endocrinology
- Reproductive Biology
- Molecular Biology
Background:
- Prolactin is a key hormone with diverse functions.
- The prolactin receptor (PRLR) mediates prolactin's actions.
- Understanding PRLR function requires a genetic model.
Purpose of the Study:
- To generate and characterize a mouse line lacking the prolactin receptor (PRLR).
- To elucidate the physiological roles of prolactin signaling in vivo.
Main Methods:
- Generation of a genetically engineered mouse line deficient in the prolactin receptor (PRLR KO).
- Phenotypic analysis of homozygous, heterozygous, and hemizygous PRLR KO mice.
- Assessment of reproductive, developmental, and metabolic parameters.
Main Results:
- PRLR knockout mice are viable, contrary to initial concerns.
- Female PRLR KO mice display complete infertility and absent mammary development.
- Hemizygous females cannot lactate; both sexes show elevated prolactin levels and pituitary hyperplasia.
- Maternal behavior, bone formation, and body weight are negatively impacted in PRLR deficient mice.
Conclusions:
- The prolactin receptor is essential for female fertility, lactation, and mammary gland development.
- Prolactin signaling influences maternal behavior, bone metabolism, and body weight regulation.
- PRLR knockout mice provide a valuable tool for studying prolactin's multifaceted physiological roles.