The short version of pentapeptide fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-01-01. Anything still debated is marked as such rather than presented as settled.
The molecule contains five residues, including alpha-aminoisobutyric acid, D-2-naphthylalanine, and D-phenylalanine, and it ends in a lysine amide. Non-natural and D-configured residues make the chain less susceptible to common peptidases, which helps explain its resistance to rapid breakdown. Its molecular formula is C38H49N9O5, corresponding to a free-base mass near 711.9 daltons. The C-terminal amide removes a negative charge and is a recurring feature in receptor-active peptides of this family. These structural choices are usually discussed as the basis for its selectivity profile.
Published animal and early human work describes growth hormone release that is separated from comparable rises in adrenocorticotropic hormone and cortisol. Prolactin changes are reported as small in the same studies. Selectivity is attributed to binding at the ghrelin receptor and to the downstream signaling that follows, rather than to differences in how quickly the peptide is cleared. Authors commonly label the compound selective rather than potent, because the same mass produces a smaller growth hormone response than some older secretagogues tested in parallel. Whether that profile holds across species and routes of administration remains an open question.
Human data remain limited and come mainly from small, short-term studies conducted decades ago. The peptide has not received approval as a medicine from major regulators, so current availability is largely as a research chemical. Reported effects on growth hormone pulsatility, appetite, and body composition should be read as preliminary, since few independent groups have replicated the original findings. Analytical characterization of research-grade material varies between suppliers, which complicates comparison across studies. Regulatory status also differs by country, and some jurisdictions classify it as a prescription-only or otherwise restricted item.
从用途定位看，ipamorelin 目前主要以研究用肽的身份被讨论，未见主要药品监管机构将其批准为治疗药物。市售材料通常标注仅供研究使用，不得用于人体或诊断程序。文献中它常与生长激素促分泌素、GHS-R1a 激动剂、胃饥饿素拟似物等表述并列出现。既有研究的样本量普遍偏小，因此对其效应强度与一致性的描述应保持谨慎。
Ipamorelin 是一种合成五肽，序列为 Aib-His-D-2-Nal-D-Phe-Lys-NH2，分子式 C38H49N9O5，游离碱分子量约 711.85 g/mol。它属于生长激素促分泌素（GHS）家族，作用靶点是胃饥饿素受体 GHS-R1a。该化合物由诺和诺德的研究团队在二十世纪九十年代末报道，设计目标是提高对生长激素释放的选择性。C 端酰胺化与 N 端 Aib 残基是两个用于抵抗肽酶降解的结构特征。
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C38H49N9O5 | Value for the free base |
| Molar mass | 711.9 g/mol | Calculated from the formula |
| Appearance | White to off-white powder | Typical lyophilized form |
| Mechanism class | Ghrelin receptor agonist | Also described as a secretagogue |
| Half-life | About 2 hours | Reported for human circulation |
The compound was developed at Novo Nordisk during the 1990s as part of a programme seeking secretagogues with improved selectivity. It was described in the peer-reviewed literature in 1998 alongside related pentapeptides from the same series. Investigators advanced it because it raised growth hormone output in animal models while leaving other pituitary hormones comparatively unaffected. The development code NNC 26-0161 appears in earlier reports, and ipamorelin later became the common designation in published work.
Selectivity is the property most often attached to this peptide. Published animal and early human studies record increases in growth hormone release after administration, with adrenocorticotropic hormone and cortisol responses remaining small by comparison. Effects on appetite-related pathways also appear weaker than those reported for several earlier secretagogues. Reviews that compare members of the growth hormone secretagogue family cite these findings frequently, though the receptor-level explanation for the selectivity continues to be debated rather than settled.
Ipamorelin is a synthetic pentapeptide classified as a growth hormone secretagogue. Its sequence, Aib-His-D-2-Nal-D-Phe-Lys-NH2, combines three non-proteinogenic residues with a C-terminal amide. The N-terminal aminoisobutyric acid unit and the two aromatic D-amino acids distinguish it from peptides assembled only from standard L-amino acids. Its formula is C38H49N9O5, corresponding to an average mass near 711.9 Da. At neutral pH the molecule carries a net positive charge, a property that shapes its behaviour in chromatographic and electrophoretic systems.
Structural features distinguish the molecule from earlier secretagogues. An alpha-aminoisobutyric acid residue near the N-terminus and a D-naphthylalanine substitution increase receptor affinity, while C-terminal amidation improves resistance to exopeptidases. These modifications are associated with reduced stimulation of appetite and of the hypothalamic-pituitary-adrenal axis compared with hexarelin or growth hormone releasing peptide-6. Whether the same profile applies at every dose level studied is a matter of ongoing investigation rather than settled consensus.
Ipamorelin is a synthetic pentapeptide that acts as an agonist at the ghrelin receptor, also called the growth hormone secretagogue receptor type 1a. Its sequence incorporates non-natural residues, which slows enzymatic breakdown relative to short native peptides. In laboratory and early clinical work the compound is described as a selective growth hormone secretagogue because it raises growth hormone with comparatively little effect on other pituitary outputs. The degree to which that selectivity holds across species and dosing regimens remains an open question in the published literature.
=== Inner systematics === A 2011 study supported separating megabats and microbats. However, other and more recent evidence indicates that megabats belong within the microbats. Two new suborders have been proposed; Yinpterochiroptera includes the Pteropodidae, or megabat family, as well as the families Rhinolophidae, Hipposideridae, Craseonycteridae, Megadermatidae, and Rhinopomatidae. Yangochiroptera includes the other families of bats (all of which use laryngeal echolocation), a conclusion supported by a 2005 DNA study. A 2013 phylogenomic study supported the two new proposed suborders.
=== Premenstrual dysphoric disorder === Fluoxetine is used to treat premenstrual dysphoric disorder, a condition where individuals have affective and somatic symptoms monthly during the luteal phase of menstruation. Taking fluoxetine 20 mg/d can be effective in treating PMDD, though doses of 10 mg/d have also been prescribed effectively.
He plants several bombs on Earth and challenges S.P.D.'s Earth unit to find them as part of a game he played on previous planets before he destroyed them while using his tiny size to hide. After Ban finds him disguised as a walkie-talkie, Byz Goa retaliates by piloting a Kaijuki called Cannon Gladiator 2 (キャノングラディエーター2, Kyanon Guradiētā Tsū), only to be deleted by Dekaranger Robo. Byz Goa is voiced by Tomokazu Seki (関 智一, Seki Tomokazu). Dradian Goldom (ドラド星人ゴルドム, Dorado Seijin Gorudomu): A criminal from Planet Drad who kidnaps Attika Alpachi's son to force him into taking a city block hostage while Goldom robs a nearby bank in the confusion, only for the Dekarangers to realize the truth. Goldom attempts to escape in his Kaijuki, Terrible Terror 2 (テリブルテーラー2, Teriburu Tērā Tsū), but is deleted by Deka Bike Robo. Goldom is voiced by Takaya Kuroda (黒田 崇矢, Kuroda Takaya). Amoreian Baachiyo (アモーレ星人バーチョ, Amōre Seijin Bacho): A hermaphroditic spider-themed criminal and stalker from Planet Amore who possesses four tendrils capable of firing spider silk-like threads to restrain targets and whose people earned a reputation for being overly passionate and "too in love". Following a brief encounter with Tetsu while the officer was working undercover as a woman, falling in love with "her", and eventually metamorphosing from his powerless immature form to his stronger adult form, Baachiyo stalks Swan Shiratori with the belief that she was the person he fell in love with.
=== Marketing === Liraglutide was approved by the US Food and Drug Administration (FDA) in 2014, and by the European Medicines Agency (EMA) in 2015, for adults with a body mass index (BMI) of 30 or greater (obesity) or a BMI of 27 or greater (overweight) who have at least one weight-related condition. Liraglutide was approved by the FDA in 2019, for treatment of children aged ten years of age or older with type 2 diabetes, making it the first non-insulin drug approved to treat type 2 diabetes in children since metformin was approved in 2000. Novo Nordisk made deals with generic manufacturers to enter the United States market in 2024. The FDA approved the first generic liraglutide in December 2024, and granted the approval to Hikma Pharmaceuticals USA
1,6-Dichloro-1,6-dideoxyfructose (dichlorodideoxyfructose) is chlorinated derivative of the sugar fructose. It is one of the two components believed to comprise the disaccharide sucralose, a commercial sugar substitute.
Sources: en.wikipedia.org
=== Campaign finances reports === Many parties failed to report their campaign finances in a timely fashion, leading to suspicion over the use of the funds. On 21 November 2021, the ONPE sent auditors to supervise the management of party funds. The first parties scheduled to be audited are the Purple Party, Alliance for Progress, We Are Peru, and Popular Force. Later, Go on Country, Free Peru, and Together for Peru will be audited.
== Biosynthesis == Alamethicin biosynthesis is hypothesized to be catalyzed by alamethicin synthase, a Nonribosomal peptide synthase (NRPS) first isolated in 1975. Although there are several sequences of the alamethicin peptide accepted, evidence suggests these all follow the general NRPS mechanism with small variations at select amino acids. Beginning with the acylation of the N terminal of the first aminoisobutiric acid on the ALM synthase enzyme by Acetyl-CoA, this is followed by the sequential condensation of amino acids by each modular unit of the synthetase. Amino acids are initially adenylated by an “adenylylation” (A) domain before being attached by a thioester bond to an Acyl Carrier Protein-like Peptidyl carrier protein. The growing chain is attached to the amino acid bearing PCP by the "condensation" (C) domain, followed by another round of the same reactions by the next module.
=== Pharmacodynamics === 3-HO-PCP acts as a high-affinity uncompetitive NMDA receptor antagonist via the PCP site with a Ki of 30 nM. It has a higher affinity than PCP, which has a Ki of 250 nM for this site (eight-fold higher). Unlike many other arylcyclohexylamines, including close analogues such as 3-Chloro-PCP and 3-MeO-PCP, 3-HO-PCP has a high affinity for various opioid receptors. It has a Ki value of 39–60 nM for the μ-opioid receptor, 140 nM for the κ-opioid receptor, and 42 nM for the σ1 receptor. It has weaker activity at the δ-opioid receptor, with a Ki of 2,300 nM.
== Inhibition == The main inhibitor of tissue plasminogen activator and urokinase is plasminogen activator inhibitor-1 (PAI-1). Plasminogen activator inhibitor-1 is a serine protease, synthesized by endothelial cells, that specifically inhibits tissue plasminogen activator (tPA) and urokinase (uPA). Tissue plasminogen activator and urokinase are the activators of plasminogen and result in the breakdown of blood clots (fibrinolysis). PAI-1 levels have also been studied in patients and how they influence certain diseases. Elevated serum levels of PAI-1 have been found in obese individuals. Elevated levels of PAI-1 also seem to increase the risk of atherothrombotic events and may also promote vascular disease. Plasminogen activator inhibitor-2 (PAI-2) is a serine protease that inactivates tPA and uPA. PAI-2 is produced by the placenta and only found in high quantities in the blood during pregnancy.
Sources: en.wikipedia.org
=== Late modern botany === Building upon the gene-chromosome theory of heredity that originated with Gregor Mendel (1822–1884), August Weismann (1834–1914) proved that inheritance only takes place through gametes. No other cells can pass on inherited characters. The work of Katherine Esau (1898–1997) on plant anatomy is still a major foundation of modern botany. Her books Plant Anatomy and Anatomy of Seed Plants have been key plant structural biology texts for more than half a century.
=== Reference levels in normal pregnancy === The hCG levels grow exponentially after conception and implantation. hCG levels typically peak around weeks 8-11 of pregnancy and are generally higher in the first trimester compared to the second trimester. The following is a list of serum hCG levels: LMP is the last menstrual period dated from the first day of the last menstrual period
=== Bioactive molecule layer === Finally, the bioactive molecule of interest is loaded into the carbohydrate layer. This process typically occurs through either lyophilization or passive adsorption, and the fully functionalized aquasome is then characterized.
Non-radiogenic Pb is negligible compared to radiogenic Pb. No modification of U/Th/Pb has occurred except radioactivity. The first assumption tends to be true since monazite is very unlikely to incorporate Pb during its growth. The non-radiogenic Pb content in many laboratory tests was found to be very low, nearly always less than 1 ppm. The most common error arising from this assumption is contamination with lead during sample preparation. The second assumption is usually justified by the concordant behavior of the mineral observed in tests. That means the system is either reset totally or unaffected totally by geological processes, there is no partial resetting of the system. Minor errors may arise due to negligible disturbance during mass transfer. The theory is that monazite has high contents of Th (generally 3–15% and up to 25% of its weight) and U (generally hundreds of ppm and up to 5% in concentration). Thus, Pb accumulates at a high rate by radioactive processes. In less than hundreds of years, it reaches a level high enough to be measured accurately by an electron microprobe.
The Soviet Salyut programme, conducted in the 1970s and 1980s, put a crewed space station in long term orbit; two of the successful installations to the station were covers for secret military Almaz reconnaissance stations: Salyut 3 and Salyut 5. During the whole duration of the cold war, the US and the USSR represented the largest and dominant space powers of the world. Despite their fierce competition, both nations signed international space treaties in the 1960s which would limit the militarization of space. The first research of anti-satellite weapon technology also came about during this period. Later, the US and USSR pursued some cooperation in space as part of détente, notably the Apollo–Soyuz orbital rendezvous and docking.
Sources: en.wikipedia.org
It has not been approved as a therapeutic by major regulators, and the human trial record is small and dated. Material available today is mostly sold as a research chemical for laboratory use. Approval and restriction status varies by country.
It binds the ghrelin receptor, known as the growth hormone secretagogue receptor type 1a. Activation of that receptor triggers signaling that leads to growth hormone release. Selectivity for growth hormone over cortisol and prolactin is the property most often cited for this compound.
Published estimates place the circulating half-life at roughly two hours in humans. Clearance involves peptidase activity and renal handling. Because the peptide is short-lived, release patterns after administration are usually described as pulsatile rather than sustained.
两者都是 GHS-R1a 激动剂，但 ipamorelin 在研究中显示出更高的生长激素释放选择性。早期资料显示它对皮质醇、催乳素与食欲的刺激弱于 GHRP-6。这些差异是相对程度，而非绝对区分。