pentadecapeptide is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-06-05. Numbers and descriptions here follow the published literature rather than marketing material.
The peptide was first described in the early 1990s by a group studying gastric secretions and tissue repair. Its fifteen-residue chain is usually written as GEPPPGKPADDAGLV in single-letter code. The free peptide has the formula C62H98N16O22 and a theoretical mass near 1419.5 daltons. These identifiers are established chemical facts that can be checked against standard peptide databases. There is no ambiguity about the primary structure.
Most published findings come from rodent experiments using induced injury or surgical models. Human reports remain scarce and are largely observational, which limits how much can be stated with confidence. Questions about absorption, distribution, metabolism, and clearance in people are still open. Dose translation between species is likewise unresolved. Researchers tend to read the animal literature as a starting point rather than a settled account.
BPC-157 is a synthetic peptide composed of fifteen amino acids. Its sequence corresponds to part of a protein found in human gastric juice, which is the origin of the "body protection compound" label. In laboratory work the material is treated as a defined research chemical rather than a finished product. Published research has centered on animal models, and the peptide is not an approved medicine in most countries.
Within the research literature, the peptide is discussed through several provisional mechanisms, including cytoprotection, modulation of growth factor signaling, and interaction with the nitric oxide system. None of these mechanisms is fully characterized, and no single pathway is universally accepted. Review articles typically note the gap between consistent animal findings and sparse human evidence. The compound is classified as a research chemical rather than an approved pharmaceutical, which shapes how studies are designed, funded, and reported.
BPC-157 is a synthetic pentadecapeptide with the sequence GEPPPGKPADDAGLV, corresponding to a partial fragment of a larger protein detected in human gastric juice. The name derives from the parent protein designation BPC, an abbreviation of body protection compound, with 157 acting as a fraction or batch identifier used by the original investigators. Its molecular weight is approximately 1419 daltons, and the chain contains no unusual residues or disulfide bridges. In the literature it is described as a short, water-soluble fragment rather than a complete natural protein.
Most early work on this peptide originated in the 1990s from a research group in Zagreb, Croatia, relying on animal models and cell cultures. Reported observations included effects on gastrointestinal lesion healing, tendon fibroblast migration, and blood vessel formation under controlled laboratory conditions. These findings come predominantly from rodent studies and in vitro assays rather than from human trials. Controlled human data remain limited, and the degree to which animal results translate to human physiology is an open question rather than a settled fact.
| Property | Value | Notes |
|---|---|---|
| Amino acid count | 15 residues | Synthetic pentadecapeptide chain |
| Sequence | GEPPPGKPADDAGLV | Single-letter amino acid code |
| Molecular formula | C62H98N16O22 | Free peptide, without counter-ion |
| Theoretical mass | Approximately 1419.5 daltons | Varies slightly with adducts and counter-ions |
| Origin | Fragment of a human gastric juice protein | Source of the BPC designation |
Proposed mechanisms in the literature involve the nitric oxide system, vascular endothelial growth factor signaling, and epidermal growth factor receptor pathways. Some studies report changes in blood vessel formation or in inflammatory mediators, while others describe interactions with nervous tissue. Much of this evidence rests on molecular markers in cultured cells or animal models. Whether the same pathways operate the same way in humans has not been established. Authors therefore tend to describe mechanisms as hypothetical rather than settled.
Direct human evidence is scarce. One trial in ulcerative colitis delivered the compound by enema and produced limited publicly reported results without a clear benefit. The compound is not an approved medicine in most jurisdictions. In many markets it is sold as a research chemical; in others it falls under prescription or controlled categories. Regulators have not confirmed any claimed medical use, and product labels rarely undergo premarket review.
Common synonyms in catalogs include pentadecapeptide BPC 157, BPC157, and the full sequence name. A CAS registry number in the 137525-51-0 range is frequently listed, though the assignment should be verified against the supplier certificate of analysis. The name itself is not a pharmacopoeial designation, and there is no standardized international nonproprietary name. Distinguishing genuine material from related fragments generally requires mass spectrometry, since several truncated sequences share similar chromatographic behavior.
BPC-157 is a synthetic pentadecapeptide whose sequence is commonly given as Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val. It is described in the literature as a fragment of a larger protein found in human gastric juice, referred to as body protection compound. The peptide was first characterized in the early 1990s by a research group in Zagreb, Croatia. Its molecular formula is C62H98N16O22 and its monoisotopic mass is approximately 1419 daltons.
Dry powder is generally stored at low temperature, with minus twenty degrees Celsius or colder advised for extended retention. Reconstituted solutions are less stable than the solid form and are normally kept cold and shielded from repeated freeze-thaw cycles. Light exposure is avoided because some peptides degrade under ultraviolet radiation. The exact rate of degradation depends on concentration, pH, and the presence of salts, so a single shelf life does not apply to every preparation. Reported stability figures should be read as indicative of typical handling rather than as universal constants.
Confirmation of identity and purity relies on standard peptide analysis techniques. Reverse-phase high-performance liquid chromatography separates the peptide from related impurities and serves as the most common purity assay. Mass spectrometry, often coupled to that chromatography step, provides an accurate molecular mass that can be matched against the expected value. Amino acid analysis or sequencing can be added for further confirmation. Because short peptides can be produced by different synthetic routes, laboratories usually report both a chromatographic purity percentage and a mass confirmation rather than a single figure.
=== Pharmacokinetics === Buspirone has a low oral bioavailability of 3.9% relative to intravenous injection due to extensive first-pass metabolism. The time to peak plasma levels following ingestion is 0.9 to 1.5 hours. It is reported to have an elimination half-life of 2.8 hours, although a review of 14 studies found that the mean terminal half-life ranged between 2 and 11 hours, and one study even reported a terminal half-life of 33 hours. Buspirone is metabolized primarily by CYP3A4, and prominent drug interactions with inhibitors and inducers of this enzyme have been observed. Major metabolites of buspirone include 5-hydroxybuspirone, 6-hydroxybuspirone, 8-hydroxybuspirone, and 1-PP. 6-Hydroxybuspirone has been identified as the predominant hepatic metabolite of buspirone, with plasma levels that are 40-fold greater than those of buspirone after oral administration of buspirone to humans. The metabolite is a high-affinity partial agonist of the 5-HT1A receptor (Ki=25 nM) similarly to buspirone, and has demonstrated occupancy of the 5-HT1A receptor in vivo. As such, it is likely to play an important role in the therapeutic effects of buspirone. 1-PP has also been found to circulate at higher levels than those of buspirone itself and may similarly play a significant role in the clinical effects of buspirone.
== Medical uses == Terlipressin is indicated to improve kidney function in adults with hepatorenal syndrome with rapid reduction in kidney function. Indications for use include norepinephrine-resistant septic shock although, 2021 Surviving Sepsis Guidelines recommend against its use for adults with septic shock and hepatorenal syndrome. In addition, it is used to treat bleeding esophageal varices.
Recent developments that exploit proximal functional groups have enabled hydrazone condensations to operate at 20 M−1s−1 at neutral pH while oxime condensations have been discovered which proceed at 500-10000 M−1s−1 at neutral pH without added catalysts.
Le Havre Official website (in French) Official tourism website Archived 23 December 2018 at the Wayback Machine Le Havre Information website (Archive) Le Havre on Lion1906 Slave streets of Le Havre; article on the slave trade here in 17th and 18th century Le Havre on Géoportail, National Geographic Institute (IGN) website (in French) Texts on Wikisource: "Havre, Le". Encyclopædia Britannica. Vol. 11 (9th ed.). 1880. pp. 527–528. "Havre, Le". Encyclopædia Britannica. Vol. 13 (11th ed.). 1911. pp. 83–84. "Havre". The American Cyclopædia. 1879. "Havre". The New Student's Reference Work. 1914. "Havre". Collier's New Encyclopedia. 1921.
=== 2010s === 2010: Marcia McNutt became the first female director of the United States Geological Survey. 2016: Marcia McNutt became the first woman president of the American National Academy of Sciences. 2018: Frances Arnold received the Nobel Prize in Chemistry "for the directed evolution of enzymes"; she shared it with George Smith and Gregory Winter, who received it "for the phage display of peptides and antibodies". This made Frances the first American woman to receive the Nobel Prize in Chemistry. 2019: Karen Uhlenbeck won the Abel Prize for "her pioneering achievements in geometric partial differential equations, gauge theory, and integrable systems, and for the fundamental impact of her work on analysis, geometry and mathematical physics." She is the first woman to win the prize.
Sources: en.wikipedia.org
This signal is known as the free induction decay (FID), and it contains the sum of the NMR responses from all the excited spins. In order to obtain the frequency-domain NMR spectrum (NMR absorption intensity vs. NMR frequency) this time-domain signal (intensity vs. time) must be Fourier transformed. Fortunately, the development of Fourier transform (FT) NMR coincided with the development of digital computers and the digital fast Fourier transform (FFT). Fourier methods can be applied to many types of spectroscopy. Richard R. Ernst was one of the pioneers of pulsed NMR and won a Nobel Prize in chemistry in 1991 for his work on Fourier Transform NMR and his development of multi-dimensional NMR spectroscopy.
== Structure and reactivity == Of the halobenzoquinones, DCBQ is the most commonly detected in drinking waters, up to 275 ng/L, and in chlorinated swimming pools, up to 299 ng/L. DCBQ can undergo hydrolysis, and its main hydrolysis product is DCBQ-OH. The transformation of DCBQ is much quicker in cell tissues than in water. The half-life of DCBQ is ~7h in water compared to ~1h in cell cultures, and is thus more reactive in cell tissues. In the human body, DCBQs can produce reactive oxidative species (ROS) at certain doses, causing mitochondrial dysfunction by reducing the mitochondrial membrane potential, and could promote the mitochondrial apoptosis pathway. DCBQ causes oxidative stress. DCBQ induced a concentration-dependent decrease in cell viability. It has also been found that DCBQ might cause nuclear DNA damage.
=== Recurring === Caroline Loncq as Mrs. Elaine Astolat/Elaine of Astolat - the Belgrade Annex's immortal caretaker, who has taken up a variety of interests and hobbies as a result of her immortality. In "And Going Medieval", she is revealed to be a former knight of Camelot, whose role as a knight was erased from history by a vengeful Lancelot. Gledisa Arthur portrays young Elaine, an aspiring knight (season 2) Adnan Hasković as General Bogdan Gregor (season 1) - the leader of the sinister cult Gregor's Hammer and Vikram's archenemy Aleksa Samardzic as Winslow Lynch (season 1) - lead member of the heavy metal band Gregor's Hammer, named after the cult, who colludes to free Gregor from a time trap Harun Cehovic as Huey, Nedjeljko Popac as Louie, and Ilija Devic as Dewey (season 1) - remaining members of Gregor's Hammer who follow Winslow Lynch Dominic Monaghan as Merlin (season 2), the legendary wizard friend of King Arthur and the Knights of the Round Table and formerly the most powerful magic-user in the world, whose corrupting obsession with magic led to the fall of Camelot. He was imprisoned in a tree for centuries, leading to the loss of his magical abilities, and is driven by the belief that magic, if handled properly, can be used for good despite the harmful effects it has on those around him, and even the addiction it creates within himself. Once he realizes the error of his ways, he is invited to serve as an archivist in the main Library.
PMID 10487456. S2CID 45118935. Bowler, P. G.; Duerden, B. I.; Armstrong, D. G. (2001). "Wound Microbiology and Associated Approaches to Wound Management". Clinical Microbiology Reviews. 14 (2): 244–69. doi:10.1128/CMR.14.2.244-269.2001. PMC 88973. PMID 11292638. Sherman, R. A.; Hall, M. J. R.; Thomas, S. (2000). "Medicinal Maggots: An Ancient Remedy for Some Contemporary Afflictions". Annual Review of Entomology. 45: 55–81. doi:10.1146/annurev.ento.45.1.55. PMID 10761570. Nigam, Yamni; Bexfield, Alyson; Thomas, Stephen; Ratcliffe, Norman Arthur (2006). "Maggot Therapy: The Science and Implication for CAM Part I—History and Bacterial Resistance". Evidence-Based Complementary and Alternative Medicine. 3 (2): 223–7. doi:10.1093/ecam/nel021. PMC 1475942. PMID 16786052.
Sources: en.wikipedia.org
Mad honey intoxication is a result of eating honey containing grayanotoxins. Honey produced from flowers of rhododendrons, mountain laurels, sheep laurel, and azaleas may cause honey intoxication. Symptoms include dizziness, weakness, excessive perspiration, nausea, and vomiting. Less commonly, low blood pressure, shock, heart rhythm irregularities, and convulsions may occur, with rare cases resulting in death. According to the FDA, honey intoxication is more likely when using "natural" unprocessed honey from farmers who may have a small number of hives because commercial processing, which pools of honey from numerous sources, dilutes the toxins. Toxic honey may also result when bees are proximate to tutu bushes (Coriaria arborea) and the vine hopper insect (Scolypopa australis). Both are found throughout New Zealand. Bees gather honeydew produced by the vine hopper insects feeding on the tutu plant. This introduces the poison tutin into honey. Only a few areas in New Zealand (the Coromandel Peninsula, Eastern Bay of Plenty Region and the Marlborough Sounds) frequently produce toxic honey. Symptoms of tutin poisoning include vomiting, delirium, giddiness, increased excitability, stupor, coma, and violent convulsions. To reduce the risk of tutin poisoning, humans should not eat honey taken from feral hives in the risk areas of New Zealand. Since December 2001, New Zealand beekeepers have been required to reduce the risk of producing toxic honey by closely monitoring tutu, vine hopper, and foraging conditions within 3 km (2 mi) of their apiary.
The Zeisel determination for methoxyl group analysis indicated two methoxyl groups per molecule. John Elix and Brian Ferguson proposed a method for the total synthesis of confluentic acid in 1978. The synthesis began with the direct condensation of suitably substituted aromatic carboxylic acids and phenols, using dicyclohexylcarbodiimide. Key precursors involved were specially prepared benzoic acids, with protective measures for reactive groups. The process included steps like bromination, alkylation, and the strategic use of protecting groups for the phenol and carboxyl functionalities. The synthesis culminated in the removal of protecting groups and hydrogenolysis over palladised carbon to yield the desired depsides including confluentic acid. In 1993, G. Fegie and colleagues introduced a standardised high-performance liquid chromatographic method that enabled the separation and detection of hundreds of lichen products, confluentic acid included.
Tunable metamaterials allow arbitrary adjustments to frequency changes in the refractive index. A tunable metamaterial expands beyond the bandwidth limitations in left-handed materials by constructing various types of metamaterials.
=== Specialized reactions === As with all carbonyl compounds, the protons on the α-carbon are labile due to keto–enol tautomerization. Thus, the α-carbon is easily halogenated in the Hell–Volhard–Zelinsky halogenation. The Schmidt reaction converts carboxylic acids to amines. Carboxylic acids are decarboxylated in the Hunsdiecker reaction. The Dakin–West reaction converts an amino acid to the corresponding amino ketone. In the Barbier–Wieland degradation, a carboxylic acid on an aliphatic chain having a simple methylene bridge at the alpha position can have the chain shortened by one carbon. The inverse procedure is the Arndt–Eistert synthesis, where an acid is converted into acyl halide, which is then reacted with diazomethane to give one additional methylene in the aliphatic chain. Many acids undergo oxidative decarboxylation. Enzymes that catalyze these reactions are known as carboxylases (EC 6.4.1) and decarboxylases (EC 4.1.1). Carboxylic acids are reduced to aldehydes via the ester and DIBAL, via the acid chloride in the Rosenmund reduction and via the thioester in the Fukuyama reduction. In ketonic decarboxylation carboxylic acids are converted to ketones. Organolithium reagents (>2 equiv) react with carboxylic acids to give a dilithium 1,1-diolate, a stable tetrahedral intermediate which decomposes to give a ketone upon acidic workup. The Kolbe electrolysis is an electrolytic, decarboxylative dimerization reaction. It gets rid of the carboxyl groups of two acid molecules, and joins the remaining fragments together.
is the acceleration due to gravity. Thus, among completely submerged objects with equal masses, objects with greater volume have greater buoyancy. Suppose a rock's weight is measured as 10 newtons when suspended by a string in a vacuum with gravity acting on it. Suppose that, when the rock is lowered into the water, it displaces water of weight 3 newtons. The force it then exerts on the string from which it hangs would be 10 newtons minus the 3 newtons of buoyant force: 10 − 3 = 7 newtons. Buoyancy reduces the apparent weight of an object. It is generally easier to lift an object through the water than it is to pull it out of the water. For a fully submerged object, Archimedes' principle can be reformulated as follows:
Sources: en.wikipedia.org
The peptide is synthetic, but its sequence matches a segment of a protein present in human gastric juice. It does not occur as a free fifteen-residue peptide in the body.
Rodents account for the large majority of published experiments. Human data are sparse and mostly observational, so cross-species extrapolation remains uncertain.
It is not an approved therapeutic in most jurisdictions. Regulatory status varies by country, and several places restrict it as a research chemical.
The sequence corresponds to a fragment of a protein found in human gastric juice, so related sequences are natural. The isolated fifteen-amino-acid peptide supplied for research is produced synthetically. Whether the free fragment circulates naturally in humans has not been settled.