The influence of prolactin secretion on human lactation

Area of Science:

• Endocrinology
• Reproductive Biology
• Lactation Physiology

Background:

• Prolactin is crucial for milk production.
• Estrogen influences mammary gland development and lactation.
• Hormonal regulation of human lactation is complex.

Purpose of the Study:

• To investigate the effect of thyrotropin-releasing hormone (TRH) on milk production and composition in postpartum women.
• To explore the role of estrogen in modulating prolactin's effects on lactation.
• To elucidate the hormonal interplay in initiating and maintaining human lactation.

Main Methods:

• Administered TRH to postpartum women to stimulate prolactin secretion.
• Measured changes in mammary milk production and fat composition.
• Analyzed prolactin responses in pregnant and parturient women to assess estrogen's inhibitory effects.

Main Results:

• TRH administration significantly increased milk production.
• Mammary milk fat composition rose by up to 228% post-TRH.
• Estrogen was found to inhibit mammary cellular response to prolactin.

Conclusions:

• TRH effectively enhances milk yield and fat content in postpartum lactation.
• Estrogen plays a significant role in regulating the sensitivity of mammary cells to prolactin.
• These findings highlight the intricate relationship between prolactin and sex steroids in human lactation.