Unmodified and phosphorylated prolactin and gamma delta T cell development and function.

Area of Science:

• Immunology
• Endocrinology
• Developmental Biology

Background:

• Gamma delta T cells play a crucial role in innate and adaptive immunity.
• Prolactin (PRL) exists in various forms, including unmodified and phosphorylated, with distinct biological activities.
• The maternal hormonal environment significantly influences fetal immune development.

Purpose of the Study:

• To investigate the impact of unmodified and phosphorylated prolactin (PRL) on immune function.
• To determine the critical role of the PRL ratio during pregnancy in gamma delta T cell development.
• To explore the potential therapeutic effects of different PRL forms in autoimmune disease models.

Main Methods:

• Studies involved manipulating the ratio of unmodified to phosphorylated PRL in pregnant rats.
• Assessed gamma delta T cell development and function in rat pups.
• Administered a recombinant molecular mimic of phosphorylated PRL to dams.
• Conducted preliminary studies on the NZB/NZW mouse model of lupus.

Main Results:

• The ratio of unmodified to phosphorylated PRL during gestation is essential for normal epidermal gamma delta T cell development in rat offspring.
• Elevated phosphorylated PRL in dams led to defective epidermal gamma delta T cell seeding and function in pups.
• Uterine gamma delta T cells in offspring were not functionally impaired, likely due to precursor availability.
• Preliminary data suggest opposing effects of unmodified and phosphorylated PRL on lupus disease markers.

Conclusions:

• Maternal PRL modification critically impacts offspring immune cell development.
• Phosphorylated PRL may play a regulatory role in fetal immune system maturation.
• Further research is warranted to explore PRL's role in autoimmune diseases like lupus.