In mice, the hormone kisspeptin and its receptor are found in sperm and egg‑related cells. Adding a short kisspeptin peptide (kisspeptin‑10) makes sperm calcium levels go up, which is important for fertilization, while blocking kisspeptin lowers IVF success. This points to kisspeptin playing a role in the fertilization process.
This review explains that the brain’s GnRH hormone, which controls reproduction, is regulated by upstream neurons rather than directly by sex hormones. Kisspeptin neurons act as the main bridge for sex‑steroid feedback to GnRH, while GnIH neurons can suppress GnRH and also affect the pituitary. The paper highlights these pathways as key steps in how stress, nutrition, and seasons influence reproductive function.
Pinto. F M FM; Cejudo-Román. A A; Ravina. C G CG; Fernández-Sánchez. M M; Martín...
Researchers found that the hormone kisspeptin and its receptor are actually present in human sperm cells. When sperm are exposed to kisspeptin in the lab, calcium levels rise slowly, and sperm movement changes in a two‑phase pattern – first it speeds up, then it slows down, and there’s a brief boost in a vigorous swimming style called hyperactivation. However, kisspein doesn’t trigger the sperm’s acrosome reaction, which is needed for fertilization, and blocking its receptor stops these effects.
Mechaly. Alejandro S AS; Viñas. Jordi J; Piferrer. Francesc F
This fish study found that the sole has two versions of the kisspeptin gene – one that works and one that doesn’t – and that when the fish fasts, the working version goes up in the brain and triggers higher reproductive hormone signals, linking food status to reproduction.
Mueller. Johanna K JK; Dietzel. Anja A; Lomniczi. Alejandro A; Loche. Alberto A; Tefs. Katrin K; Kie...
The paper maps how the kisspeptin gene (KiSS1) is turned on and off in brain cells that control puberty, showing which proteins boost its activity and which suppress it, but it doesn’t give any direct tips for using kisspeptin as a supplement or therapy.
Constantin. Stephanie S; Iremonger. Karl J KJ; Herbison. Allan E AE
In live mice, most GnRH cells that control fertility fire on their own, but they do so in many different ways. Giving kisspeptin (a short peptide) reliably turns these cells on, while drugs that change GABA‑A receptor activity can either boost or shut down their firing. This shows that the brain’s reproductive switch is highly variable and heavily dependent on GABA signaling.
A 30‑year‑old woman with PCOS used kisspeptin‑54 to trigger ovulation for IVF and ended up with a severe form of ovarian hyperstimulation syndrome, including massive fluid buildup in her abdomen. The case shows that while kisspeptin can be used to induce ovulation, it can still cause dangerous side effects if the ovaries are overly stimulated.
Demirbilek. Huseyin H; Gonc. Elmas Nazli EN; Ozon. Alev A; Alikasifoglu. Ayfer A; Kandemir. Nurgun N
The study found that girls with early puberty have higher blood levels of the hormone kisspeptin, and those levels drop when treatment successfully stops puberty. This suggests kisspeptin could help doctors confirm early puberty and track if treatment is working, but it doesn’t give a new way to boost health or performance for most people.
The study shows that kisspeptin-10 makes certain brain cells that control reproductive hormones (GnRH neurons) take up more calcium. Most of this calcium comes in through channels that don’t need electrical spikes, while a smaller part comes from voltage‑gated channels that are triggered by sodium spikes.
In a lab study using chicken liver cells, the peptide kisspeptin‑10 (Kp‑10) at a concentration of 100 nM boosted the cells' production of triglycerides and cholesterol‑carrying particles without killing the cells. It also changed the activity of several genes that control fat metabolism, although the protein that drives fat synthesis (SREBP‑1) went up even though its gene level went down.
A study in young male rats found that giving kisspeptin-10 repeatedly for two weeks lowered key hormones (LH and testosterone) and caused serious damage to the testes, including fewer sperm cells and structural degeneration. The harmful effects were seen at doses as low as 1 ng per injection, and got worse with higher doses.
This review explains that the kisspeptin system in the brain is a major driver of puberty and that its activity is influenced by the body’s energy balance and other neuropeptides, with epigenetic factors also playing a role. It doesn’t give any direct instructions for using kisspeptin-10, but it highlights how metabolism and hormones interact during development.
Hrabovszky. Erik E; Sipos. Máté T MT; Molnár. Csilla S CS; Ciofi. Philippe P; Borsay....
In young men, the brain cells that make kisspeptin, neurokinin B, and dynorphin are mostly separate, unlike what’s seen in animals. This means the popular “KNDy neuron” idea doesn’t fully apply to humans, so animal‑based tricks for tweaking hormone pulses may not work the same way in people.
The study shows that higher levels of the KiSS-1 gene are linked to better outcomes in a type of bladder cancer, and that giving the peptide metastin (related to kisspeptin‑10) to mice reduces tumor spread and improves survival, mainly by blocking a cell‑signaling pathway (NF‑κB) that helps cancer invade tissue.
Topaloglu. A Kemal AK; Tello. Javier A JA; Kotan. L Damla LD; Ozbek. Mehmet N MN; Yilmaz. M Bertan M...
A genetic mutation that disables the kisspeptin protein caused a family to fail puberty, proving that functional kisspeptin is essential for the hormone signals that start reproduction.
The study shows that kisspeptin talks to brain cells that make nitric oxide (NO) to help trigger the hormone surge that leads to ovulation in mice. This interaction happens in a specific brain area and involves a signaling pathway (AKT) that activates the NO‑making enzyme. While the work is done in mice, it suggests that kisspeptin’s effect on fertility may depend on NO signaling.
Redmond. J S JS; Macedo. G G GG; Velez. I C IC; Caraty. A A; Williams. G L GL; Amstalden. M M
In young sheep, giving kisspeptin-10 through an IV caused quick bursts of the hormone LH, raised estrogen levels, and briefly triggered a luteal‑like phase, but it didn’t speed up the overall timing of puberty. The effect was short‑lived and the study was done in lambs, not people.
Cockwell. Heather H; Wilkinson. Diane A DA; Bouzayen. Renda R; Imran. Syed A SA; Brown. Russell R; W...
Researchers found that the gene for kisspeptin (KISS1) is active in women's fat tissue, especially under the skin, and that higher levels in belly fat are linked to higher BMI. This suggests that kisspeptin isn’t just a brain hormone but may also be made by fat cells.
Researchers found that kisspeptin-10, a peptide normally involved in puberty, can thin the blood in rats and also affects human blood samples in the lab, making it take longer to clot. The effect grows with higher doses and seems linked to lower calcium levels and fewer platelets, but the study is still early‑stage and only done in animals and test tubes.
Olbrich. Teresa T; Ziegler. Elke E; Türk. Gregor G; Schubert. Antje A; Emons. Günter G; Gr...
Researchers found that a short peptide called kisspeptin‑10 can block breast cancer cells that have the GPR54 receptor from moving toward bone in lab dishes. The effect only shows up within a narrow concentration range (about one trillionth to one hundred‑billionth of a mole). It works by lowering the cancer cells' CXCR4 receptor and the bone‑cell signal (SDF‑1) that normally attracts them.