For decades, the clinical understanding of menopause has been dominated by the “estrogen deficiency” model. While accurate, this global view often leaves clinicians with limited options when hormone replacement therapy (HRT) is contraindicated or declined.
Recent breakthroughs in neuroendocrinology have shifted the focus toward a specific set of regulators within the hypothalamus: the KNDy neurons. Understanding this network allows clinicians to move beyond symptom-by-symptom management toward a neurocircuit-based approach that addresses the biological root of menopausal vasomotor symptoms (VMS) and metabolic changes.
KNDy neurons are a population of cells in the hypothalamus that serve as the “regulation center” for reproduction and metabolism. Their function is defined by a neuropeptide trio:
In a premenopausal state, estradiol provides the necessary negative feedback to keep these neurons in check. However, during menopause, the lack of estrogen causes the system to “run open.” This chronic overstimulation leads to neuronal hypertrophy (enlargement) of the KNDy complex.
While hot flashes have the “best publicist” regarding menopause, other symptoms follow closely behind. According to Donna Adams-Pickett, MD, PhD, a board-certified OB/GYN with decades of clinical experience, KNDy dysregulation is the common thread.
“The KNDy neurons play a huge role in temperature, sleep, and weight regulation in terms of insulin resistance. The cycle of GnRH, LH, and FSH stimulation — followed by the release of estradiol — is disrupted during menopause because there is very little estrogen,” Dr. Adams-Pickett explains.
“That lack of estrogen feeds back to the KNDy neurons,” she continues. “They effectively say, ‘Please give us more GnRH.’ The GnRH then increases LH and FSH, but the ovary doesn’t respond with estrogen.”
The end result is the hypertrophy of the KNDy complex. As it becomes dysregulated, patients experience systemic instability, including fluctuations in core temperature, decreased insulin sensitivity, and disrupted sleep patterns.
Until recently, hormonal intervention was the only way to modulate the overstimulated KNDy cycle. This left a significant gap for patients who are not candidates for HRT, particularly those with hormone-sensitive cancers.
Dr. Adams-Pickett points to several advancements in Neurokinin (NK) Antagonists as a solution:
“When you have a patient who is not a candidate for HRT, this is a great option. We focus on the ‘N’ (Neurokinin) part of the KNDy acronym because that is what is responsible for stimulating GnRH. These antagonists are excellent for patients who cannot take hormones,” Dr. Adams-Pickett shares.
To help fellow healthcare providers explain this to patients, Dr. Adams-Pickett uses a “Gas Station” analogy:
“In a functioning system, KNDy triggers the trip to the pump. You put the hose in the tank (GnRH stimulation), trigger the pump (LH/FSH), and release the gas (estradiol). Once the tank is full, the pump shuts off, and the signal is silenced,” she notes.
However, during menopause, the pump is empty. “You’re pumping air into your engine. You think, ‘There’s nothing here, let me drive to another pump.’ You stimulate the KNDy neurons more and more. Eventually, you harm the vehicle because you’ve introduced something you didn’t need — excess air and extra miles — while the car still has no fuel. Eventually, the body cannot function.”
Dr. Adams-Pickett encourages clinicians to use this biological understanding to normalize the transition. She advises starting conversations early: “Even if the patient isn’t experiencing symptoms yet, she won’t be as put off when they occur. She will recognize it for what it is and intervene sooner because we had the conversation.”
As we recognize that different receptors impact women in unique ways, Dr. Adams-Pickett advocates for a more individualized approach to menopause care.
“It’s vital for all clinicians — not just specialists — to grasp how these medications work. In our current healthcare climate, many patients only have a relationship with their primary care provider or their OB/GYN. If we all have a working knowledge of this neurocircuitry, we can best equip our patients to feel their best,” she concludes.
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