Opioid peptides in pseudocyesis

Area of Science:

• Reproductive Endocrinology
• Neuroendocrinology

Background:

• Pseudocyesis, or false pregnancy, presents with symptoms mimicking pregnancy but without conception.
• Hormonal imbalances, particularly those resembling polycystic ovarian disease (PCOD), have been anecdotally linked to pseudocyesis.

Purpose of the Study:

• To evaluate the hormonal profiles of women diagnosed with pseudocyesis.
• To investigate the potential role of opioid pathways in the pathophysiology of pseudocyesis through naloxone challenge.

Main Methods:

• Hormone levels (LH, FSH, prolactin, estrone, estradiol, progesterone) were measured in five women with pseudocyesis.
• The opiate antagonist naloxone was administered to four patients to assess its effect on luteinizing hormone (LH) and prolactin (PRL) release.
• Hormonal responses to naloxone were re-evaluated after pseudocyesis resolution.

Main Results:

• Women with pseudocyesis exhibited hormonal patterns consistent with PCOD, including elevated LH, PRL, estrone, and estradiol.
• Elevated progesterone levels were observed in four patients during the follicular phase.
• Naloxone administration failed to induce LH or PRL release in patients with active pseudocyesis.
• Following resolution of pseudocyesis, naloxone-induced LH release normalized according to the menstrual cycle phase.

Conclusions:

• The hormonal milieu in pseudocyesis may resemble that of PCOD.
• Naloxone-insensitive opioid mechanisms are likely not implicated in the hormonal dysregulation observed in pseudocyesis.
• The resolution of pseudocyesis is associated with a normalization of neuroendocrine function, including appropriate LH pulsatility.