Pei. Xiao M XM; Yung. Benjamin Y BY; Yip. Shea Ping SP; Ying. Michael M; Benzie. Iris F IF; Siu. Par...
In mice, giving the peptide desacyl ghrelin protected the heart from damage caused by the chemotherapy drug doxorubicin. It kept the heart pumping normally, stopped scar tissue from building up, and prevented cell death, even when a blocker of the usual ghrelin receptor was present, suggesting it works through a different pathway.
Ceriotti. Serena S; Consiglio. Anna Lange AL; Casati. Lavinia L; Cremonesi. Fausto F; Sibilia. Valer...
In a lab study using horse cartilage cells, researchers found that a relatively high dose of the hormone ghrelin can shield the cells from inflammation‑driven damage, but lower doses actually hurt the cells. The protective effect works through the GHS‑R1a receptor and disappears when a blocker (D‑Lys3‑GHRP‑6) is added. A related form of ghrelin that doesn’t bind this receptor (des‑acyl ghrelin) made the damage worse.
Torres. P J PJ; Luque. E M EM; Ponzio. M F MF; Cantarelli. V V; Diez. M M; Figueroa. S S; Vincenti....
In mice, giving extra ghrelin or a ghrelin blocker (the drug D‑Lys3‑GHRP‑6) to pregnant mothers changed how their babies grew and developed sexually. More ghrelin made male pups heavier, while the blocker made boys hit puberty earlier but later reduced testicle size and sperm movement. Girls also hit puberty sooner and had larger ovaries. Both treatments hinted at possible problems with adult fertility.
Cruz. Maureen T MT; Herman. Melissa A MA; Cote. Dawn M DM; Ryabinin. Andrey E AE; Roberto. Marisa M
The study shows that the hormone ghrelin can boost inhibitory (GABA) signals in a part of the rat brain linked to stress and alcohol use, and that this effect changes when alcohol is present. Blocking ghrelin receptors reduces this boost, indicating a natural, ongoing ghrelin activity in that brain region.
Patel. Kalpesh K; Dixit. Vishwa Deep VD; Lee. Jun Ho JH; Kim. Jie Wan JW; Schaffer. Eric M EM; Nguye...
The study shows that D‑Lys3‑GHRP‑6, a peptide usually used in labs to block the ghrelin receptor, also weakly blocks another receptor called CCR5, which is involved in HIV entry and inflammation. This off‑target effect is modest but real, meaning the peptide isn’t as selective as many think.
Chen. Xiaodong X; Chen. Qingwei Q; Wang. Li L; Li. Guiqiong G
In rats, the hormone ghrelin helps special blood‑vessel repair cells move where they’re needed, using a chain of signals (PI3K/Akt/eNOS/NO). Blocking ghrelin’s receptor with a compound called [D‑Lys3]-GHRP‑6 stops this movement, showing that GHRP‑6 can interfere with that repair process.
Szakács. Júlia J; Csabafi. Krisztina K; Lipták. Nándor N; Szabó. Gyula G
In a mouse study, the peptide obestatin made the animals act more anxious and raised their stress hormone levels. Blocking the ghrelin receptor with a GHRP‑6 antagonist or blocking CRH receptors stopped these anxiety effects, suggesting that obestatin’s anxiogenic action works through those pathways.
Huang. Shuo S; Lee. Samantha A SA; Oswald. Karen E KE; Fry. Mark M
The study shows that the hunger hormone ghrelin can make certain brain cells in mice grow more branches and become more easily excited, and that a ghrelin blocker (D‑Lys‑GHRP‑6) stops this effect. This suggests ghrelin and its blockers can change brain cell wiring, but the work was done in isolated mouse neurons, not in people.
In rats, giving the non‑active form of ghrelin (des‑acyl ghrelin) either directly into the brain or into the bloodstream makes the back get cooler and the tail get warmer. This temperature shift is controlled by the parasympathetic nervous system and a brain area that monitors body heat, and it doesn’t use the usual ghrelin receptor. The peptide also relaxes blood vessels in lab tests.
Palotai. Miklós M; Bagosi. Zsolt Z; Jászberényi. Miklós M; Csabafi. Krisztina K;...
In rat brain slices, the hunger hormone ghrelin was found to boost dopamine release, and it made nicotine cause even more dopamine to be released. Blocking ghrelin’s receptor with the peptide GHRP‑6 reduced these effects, showing ghrelin’s role in nicotine‑related reward pathways.
Song. Lige L; Zhu. Qianqian Q; Liu. Tianwei T; Yu. Ming M; Xiao. Kewei K; Kong. Qingnuan Q; Zhao. Re...
The study shows that ghrelin, the hormone that stimulates hunger, can directly increase the activity of neurons in the brain's lateral amygdala and, when injected there, it blocks the learning of a bad taste. This effect is stopped by a drug that blocks the ghrelin receptor (GHS‑R1a), such as D‑Lys3‑GHRP‑6. The findings suggest that ghrelin signaling in the amygdala plays a role in how we form aversive memories, but the experiments used direct brain injections, not the usual oral or injectable doses used by most people.
In rats, giving the hormone ghrelin before heart‑lung machine surgery lowered inflammation, cell death and oxidative stress in the heart, leading to better heart function. The protective effect disappeared when the ghrelin receptor was blocked or when a key signaling pathway (Akt) was inhibited, showing that ghrelin works through that route.
Sirotkin. Alexander V AV; Pavlova. Silvia S; Tena-Sempere. Manuel M; Grossmann. Roland R; Jimén...
In chickens, skipping meals or being older changes how much ghrelin (the hunger hormone) and its receptor are made in the brain and ovaries. Giving ghrelin itself or a GHRP‑6‑like blocker can raise the brain's ghrelin receptor levels, but they don’t have the same effect in the ovary. The related peptide obestatin can also tweak these signals.
The study shows that a traditional Japanese medicine, rikkunshito, can protect against the stomach‑slowing side effects of Parkinson's drug L‑dopa, and that this protective effect is partly blocked by a ghrelin‑blocking peptide called GHRP‑6. In rats, giving GHRP‑6 reduced the benefit of rikkunshito, suggesting GHRP‑6 interferes with ghrelin‑driven stomach motility.
Zhu. Jianhua J; Zheng. Chenghong C; Chen. Jie J; Luo. Jing J; Su. Bintao B; Huang. Yan Y; Su. Wen W;...
The study shows that the hormone ghrelin can protect blood vessel cells from dying when they’re exposed to high sugar levels. It does this by turning on a cell‑growth pathway (mTOR/P70S6K) and increasing the balance of protective proteins (Bcl‑2 vs. Bax). Blocking ghrelin’s receptor or the mTOR pathway stops this protection, proving the effect is real in the lab.
Hyland. Lindsay L; Rosenbaum. Stephanie S; Edwards. Alexander A; Palacios. Daniel D; Graham. M Dean...
In male rats, activating the ghrelin receptor in different brain spots changes sexual drive: stimulating it in the reward area (VTA) may boost motivation, while stimulating it in the mating area (mPOA) reduces it. Rats lacking a functional ghrelin receptor or those that are food‑restricted show less sexual anticipation. Blocking ghrelin in the VTA further lowers sexual drive in hungry rats, but blocking it in the mPOA has no extra effect.
Maric. Tia T; Sedki. Firas F; Ronfard. Benedicte B; Chafetz. Danielle D; Shalev. Uri U
In rats, giving ghrelin makes heroin more rewarding, but blocking ghrelin receptors with the peptide D‑Lys‑3‑GHRP‑6 does not change how much heroin the animals take or how quickly they start seeking it again after a break. This means that, at least in this animal model, the GHRP‑6 antagonist isn’t useful for curbing opioid use.
The study shows that the blood‑pressure drug diltiazem can protect human vein cells from oxidative damage caused by angiotensin II, and that this protection depends partly on the growth‑ hormone secretagogue receptor (GHSR1a). Blocking GHSR1a with a peptide (D‑Lys3‑GHRP‑6) weakens diltiazem’s benefit, suggesting the receptor plays a role in the anti‑oxidant effect.
Foradori. Chad D CD; Whitlock. Brian K BK; Daniel. Jay A JA; Zimmerman. Arthur D AD; Jones. Melaney...
In fasted sheep, delivering kisspeptin into the brain triggers a strong rise in growth hormone, but only when the animal has ghrelin (the hunger hormone) and active neuropeptide Y (NPY) pathways. Blocking NPY or ghrelin stops this GH increase, showing that short‑term fasting creates a hormonal environment that lets kisspeptin boost GH release.
The study shows that the stomach hormone ghrelin can speed up stomach movements by acting on specific brain regions (the hippocampus and arcuate nucleus). When ghrelin was injected directly into the brain of rats, stomach activity increased, and this effect was stopped by a ghrelin‑blocking drug called [d‑Lys‑3]-GHRP‑6. The work was done in rats with brain injections, so it isn’t a ready‑to‑use protocol for people, but it highlights that ghrelin’s impact on digestion involves the brain.