Menstrual Cycle Reshapes Nearly 200 Blood Proteins, Offering Broader View of Women’s Health A landmark study has revealed that the human menstrual cycle drives widespread changes in the circulating proteome, identifying nearly 200 proteins that fluctuate across its phases. This systemic molecular signature extends far beyond reproductive hormones, influencing immune function, metabolism, and tissue remodeling throughout the body. Researchers analyzed plasma samples from over 2,700 women in the UK Biobank, profiling nearly 3,000 circulating proteins. They identified 198 proteins with significant variation across the menstrual cycle, forming distinct temporal patterns aligned with the follicular, ovulatory, and luteal phases. These proteins include reproductive hormones, cytokines, growth factors, and others enriched in endometrial tissue, reflecting both local and systemic biological processes. Each phase of the cycle exhibits a unique proteomic signature. During the follicular phase, proteins linked to tissue growth and cellular remodeling are elevated. Around ovulation, there is a surge in proteins associated with immune activation, resembling a controlled inflammatory response. In the luteal phase, metabolic and immune-regulatory pathways dominate, consistent with the influence of progesterone. Importantly, hundreds of these proteins show consistent cyclical variation, demonstrating that the menstrual cycle is a major regulator of systemic biology rather than a localized reproductive process. The immune system plays a central role, with significant fluctuations in proteins related to cytokine signaling, innate immunity, and complement pathways across the cycle. This reinforces the understanding that ovulation is not merely a hormonal event but likewise an immunologically active process. The study further identified links between several of these cycle-varying proteins and common reproductive disorders, including endometriosis, uterine fibroids (leiomyoma), and abnormal uterine bleeding. To translate these findings into a practical tool, researchers developed a proteomic score based on 75 proteins that accurately predicts menstrual cycle phase. These results provide a systems-level atlas of menstrual cycle biology and offer latest avenues for biomarker discovery in women’s health. By revealing how the cycle reshapes the blood proteome, the study underscores the importance of considering menstrual phase in clinical diagnostics and biomedical research, particularly for conditions that may present differently across the cycle. The findings advocate for a more nuanced approach to women’s health that accounts for the dynamic, whole-body nature of the menstrual cycle.
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