Protirelin

Prolactin is a polypeptide hormone composed of 199 amino acids, synthesized by lactotroph cells. Its primary effects are on the mammary gland and gonadal axes, but it also influences different organs and systems, particularly metabolic functions. Current literature has mainly focused on the diagnosis, monitoring, and treatment of hyperprolactinemia. Due to the lack of a well-established effective treatment for hypoprolactinemia, it is not clinically emphasized. Therefore, data on its diagnosis is limited. Hypoprolactinemia has been associated with metabolic dysfunctions such as type 2 diabetes mellitus, fatty liver, dyslipidemia, fertility problems, sexual dysfunction, and increased cardiovascular disease. While often seen as a part of combined hormone deficiencies due to pituitary damage, isolated prolactin deficiency is rare. Hypoprolactinemia can serve as a marker for extensive pituitary gland damage and dysfunction.Low or undetectable serum prolactin levels and the absence of a sufficient prolactin peak in the thyrotropin-releasing hormone (TRH) stimulation test are considered diagnostic for hypoprolactinemia. Gender appears to influence both basal prolactin levels and TRH stimulation test responses. Basal prolactin levels of, at least, 5 ng/mL for males and 7 ng/mL for females can be used as cut-off levels for normal prolactin reserve. Minimum peak prolactin responses of 18 ng/mL for males and 41 ng/mL for females to TRH stimulation can exclude hypoprolactinemia. However, larger population studies across different age groups and sexes are needed to better define normal basal prolactin levels and prolactin responses to the TRH stimulation test.

Itch is an unpleasant sensation that induces a desire to scratch. Chronic itch is accompanied by inflammatory skin diseases and causes repetitive scratching leading to tissue damage. The thyrotropin-releasing hormone analog taltirelin exerts analgesic effects on acute and chronic pain by activating the descending inhibitory systems. However, little is known regarding its effects on acute and chronic itch. In this study, we examined the effects of taltirelin on acute and chronic itch. Subcutaneous injection of chloroquine increased the number of scratching bouts in 30 min, whereas intraperitoneal injection of taltirelin reduced these episodes in a dose-dependent manner. In addition, chronic itch induced by diphenylcyclopropenone treatment was alleviated by taltirelin injection. These findings indicate that taltirelin alleviates acute and chronic itch in mice, and can be a potent therapeutic antipruritic drug.