Prolactin cell

Diagram of a prolactin cell

Prolactin cells, also known as lactotrophs, are specialized cells located in the anterior pituitary gland. These cells are responsible for the production and secretion of the hormone prolactin, which plays a crucial role in lactation and various other physiological processes.

Structure

Prolactin cells are characterized by their polygonal shape and the presence of numerous secretory granules. These granules contain prolactin, which is synthesized and stored until it is released into the bloodstream. The cells are typically found in clusters within the anterior pituitary and are interspersed with other hormone-producing cells such as somatotrophs, corticotrophs, and thyrotrophs.

Function

The primary function of prolactin cells is the synthesis and secretion of prolactin. Prolactin is a peptide hormone that is essential for the initiation and maintenance of milk production in the mammary glands. In addition to its role in lactation, prolactin has over 300 different functions in the body, including roles in immune system regulation, metabolism, and reproductive health.

Regulation

The activity of prolactin cells is regulated by several factors. The most significant regulator is the hormone dopamine, which is secreted by the hypothalamus and acts as an inhibitor of prolactin secretion. When dopamine levels decrease, prolactin secretion increases. Other factors that influence prolactin cell activity include estrogen, thyrotropin-releasing hormone (TRH), and various neurotransmitters.

Clinical Significance

Dysfunction of prolactin cells can lead to various clinical conditions. Hyperprolactinemia, a condition characterized by elevated levels of prolactin in the blood, can result from prolactinomas, which are benign tumors of the prolactin cells. Symptoms of hyperprolactinemia include galactorrhea, amenorrhea, and infertility. Treatment often involves the use of dopamine agonists to reduce prolactin levels.

Related Pages

• Anterior pituitary gland
• Prolactin
• Lactation
• Dopamine
• Hyperprolactinemia