Prolactin/cortisol ratio in rheumatoid arthritis

Area of Science:

• Endocrinology
• Immunology
• Rheumatology

Background:

• Hormones like prolactin (PRL) and glucocorticoids play a role in immune system regulation.
• Rheumatoid arthritis (RA) exhibits a diurnal pattern in disease activity.
• Understanding hormonal influences on RA is crucial for managing inflammatory conditions.

Purpose of the Study:

• To investigate the diurnal variations of PRL/cortisol ratio, IL-1beta, and TNF-alpha in RA patients.
• To determine if hormonal imbalances correlate with the diurnal rhythm of RA disease activity.
• To explore the interplay between pro-inflammatory and anti-inflammatory hormones in nocturnal RA symptoms.

Main Methods:

• Blood samples were collected from RA patients and healthy controls at six time points over 24 hours (0600, 1000, 1400, 1800, 2200, 0200).
• Hormonal levels, including prolactin (PRL) and cortisol, were measured.
• Serum levels of pro-inflammatory cytokines, Interleukin-1beta (IL-1beta) and Tumor Necrosis Factor-alpha (TNF-alpha), were quantified.

Main Results:

• RA patients exhibited a significantly higher PRL/cortisol ratio at 0200 hours compared to controls.
• Serum levels of IL-1beta and TNF-alpha peaked at 0200 and 0600 hours in RA patients.
• An imbalance favoring pro-inflammatory hormones over anti-inflammatory hormones was observed during nocturnal hours in RA patients.

Conclusions:

• The study reveals a distinct nocturnal hormonal imbalance in RA patients, characterized by elevated PRL/cortisol ratios and increased pro-inflammatory cytokines.
• This hormonal dysregulation during nighttime hours is associated with the diurnal rhythm of RA disease activity.
• Findings suggest that targeting hormonal pathways may offer new therapeutic strategies for managing RA, particularly its nocturnal manifestations.