Coyle, C., & Campbell, R. E. (2019). Pathological pulses in PCOS. Molecular and Cellular Endocrinology, 498, 110561. https://doi.org/10.1016/j.mce.2019.110561
Faster LH pulses in many women with PCOS point toward the brain
A 2019 mini-review reports that many women with polycystic ovary syndrome (PCOS) have faster pulses of luteinizing hormone (LH). The authors write that this LH pattern drives many ovarian features of PCOS. In their account, a weaker response to ovarian hormone feedback points to a problem in the brain network that sets the hormone pulses.
Key Findings
Many women with PCOS show a higher LH pulse frequency and a raised ratio of LH to follicle stimulating hormone (FSH), even though the condition is a spectrum disorder.
The authors state that this pattern of LH and FSH signaling drives many downstream ovarian features of PCOS, among them a rise in androgen production, and indicates neuroendocrine impairments upstream.
A reduced response to negative feedback from ovarian steroid hormones in women with PCOS points toward dysfunction in the brain's network of gonadotropin-releasing hormone (GnRH) nerve cells.
In preclinical models, excess androgen exposure during development or around the onset of puberty can reproduce the neuroendocrine features of PCOS.
The review describes PCOS as a highly prevalent endocrine disorder associated with androgen excess and a lack of ovulation.
Interpretation
The source is the published abstract of a 2019 mini-review, a short summary of past research; the full text was not available. The authors draw on clinical findings and on preclinical models of androgen excess during development or puberty, which they describe as fundamental to beginning to untangle the brain mechanisms. The review outlines the PCOS features linked to fast GnRH and LH pulses, then sets out what is known and what is yet to be found about those mechanisms. The authors describe PCOS as a spectrum disorder in which many women share the faster pulse pattern.
RRM Context
PCOS now has a new name, polyendocrine metabolic ovarian syndrome (PMOS). An international group chose it in 2026 to reflect a condition affecting several body systems, and a model placing part of the problem in the brain fits that view. RRM looks for the root cause of poor ovulation before it treats, so a cause that may start above the ovary widens the search.
Our editorial summary of this paper, not the article's abstract.
Abstract
Polycystic ovary syndrome (PCOS) is a highly prevalent endocrine disorder associated with hyperandrogenism and anovulation. Although a spectrum disorder, many women with PCOS exhibit elevated luteinizing hormone (LH) pulse frequency and an elevated LH to follicle stimulating hormone ratio. This aberrant pattern of gonadotrophin signalling drives many of the downstream ovarian features of PCOS, including increased androgen synthesis, and indicates neuroendocrine impairments upstream. Decreased responsiveness to gonadal steroid hormone negative feedback in PCOS patients points toward dysfunction within the gonadotropin-releasing hormone (GnRH) neuronal network in the brain. Excessive androgen exposure during development or over pubertal onset can recapitulate the neuroendocrine pathology of PCOS in pre-clinical models, and these models have been fundamental in beginning to pick apart the specific central mechanisms involved. This mini-review will briefly describe the pathology of PCOS associated with high frequency GnRH/LH pulses and then highlight what is currently known, and yet to be discovered, about the central mechanisms involved.
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