The short version of nitric oxide fits in a sentence. The long version — which is the one that helps — is below.
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Terminology in the literature is not fully standardised. Papers and product listings use BPC-157, BPC 157, and the longer phrase stable gastric pentadecapeptide BPC 157 interchangeably, and synonyms such as bepecin or PL 14736 appear in older or company-linked publications. Purity claims and reported masses can also differ between sources because peptide preparations may include counterions, residual solvents, or bound water. This variability complicates direct comparison of results across studies and makes the exact identity and grade of a given sample worth verifying. Discussions of the compound should therefore specify the source, salt form, and stated purity where those are known.
BPC-157 is a synthetic peptide composed of fifteen amino acid residues, with the sequence Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val. Its name derives from body protection compound, a term used for a protein fraction identified in human gastric juice. Researchers in Zagreb first reported the pentadecapeptide in the early 1990s and described it as a stable fragment of that larger protein. The compound is also catalogued as PL 14736 and, in some commercial contexts, as bepecin. Its molecular formula is C62H98N16O22 and its monoisotopic mass is approximately 1419 daltons.
Identity and purity are established with complementary methods rather than one test. Reverse-phase high-performance liquid chromatography separates the main peak from deletion sequences and oxidized variants, and its area percentage is the usual purity figure. Mass spectrometry confirms the expected molecular mass and can flag truncations or modifications that chromatography alone might miss. Amino acid analysis and peptide mapping add sequence-level confirmation, while residual counter-ion and water content are measured separately.
A freeze-dried sample is generally the most stable form and is commonly held at minus twenty degrees Celsius or lower for long-term keeping, with brief transfers at room temperature. The solid is hygroscopic, so vials are warmed to ambient temperature before opening to prevent condensation from degrading the contents. Light exposure and repeated temperature cycling are both avoided in routine handling. Storage over a desiccant is a common laboratory practice that limits moisture uptake during repeated access.
Once dissolved, the material is considerably less stable than the dry solid. Aqueous solutions are usually kept cold and used within a short window, and neutral or mildly acidic buffers are preferred over strongly alkaline conditions. Freeze-thaw cycles promote aggregation and loss of material to container surfaces, so dividing a batch into single-use aliquots is standard. Adsorption to plastic and glass can lower the measured concentration, meaning solution strength may need rechecking before an experiment.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C62H98N16O22 | Computed for the free peptide |
| Monoisotopic mass | Approximately 1419 Da | Reported values shift with counterion and hydration |
| Residue count | 15 amino acids | Sequence Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val |
| Origin | Fragment of human gastric juice protein | First described in early 1990s research reports |
| Common synonyms | BPC 157; PL 14736; bepecin | Naming varies across papers and catalogues |
Proposed mechanisms include interaction with the nitric oxide system, modulation of growth factor signaling, and effects on blood vessel formation. None of these has been established as the primary mode of action, and some proposed pathways rest on indirect measurements. Whether the reported effects depend on a specific receptor has not been determined. Stability in gastric acid, unusual for a peptide of this size, is also reported in animal work, but the reason for it is not firmly established.
Published studies on BPC-157 are dominated by animal models. Commonly used endpoints include healing of surgically induced lesions in the stomach, tendon-to-bone attachment after transection, and recovery from experimentally induced vascular or intestinal damage. Many of these reports come from a small number of research groups, and the peptide is often described as acting across a wide range of tissue types. That breadth is itself a point of discussion, since one molecule influencing many unrelated systems is unusual.
Human data are far more limited than animal data. A small number of clinical reports exist, generally with few participants and without the randomization or blinding expected in later-phase trials. No large, independently replicated human trial has appeared in the indexed peer-reviewed literature. Statements about effects in people therefore rest on extrapolation from animal work rather than on direct evidence, and the strength of that extrapolation remains an open question rather than a settled matter.
Most published findings come from rodent models, where the peptide has been examined in wound-healing, gastrointestinal-lesion, tendon, and vascular-injury preparations. A smaller number of early human studies have been reported, chiefly in inflammatory bowel conditions, but the public record is short and has not led to marketing approval in the United States or the European Union. Reviewers therefore classify the compound as investigational, and whether animal results carry over to people remains an open question rather than a settled one.
Outside laboratory supply channels, the peptide is sold as a research chemical, a category that carries no requirement to demonstrate purity, identity, or freedom from contamination. Because it is not an approved medicine, products labeled BPC-157 sit in a regulatory gap in many countries, and actual content may differ from the label. Sports organizations list it among prohibited substances, so its presence in an athlete's sample can produce a doping finding regardless of how the material was obtained.
BPC-157 is a synthetic peptide of fifteen amino acids, written as GEPPPGKPADDAGLV, whose sequence matches part of a larger protein identified in human gastric juice. That parent protein was described in stomach-secretion research, and the fifteen-residue fragment was named body protection compound, which gives the peptide its common label. Material used in experiments is produced by solid-phase peptide synthesis rather than extracted from tissue. The reported molecular weight is about 1419 daltons, and the chain contains several proline residues, a feature that appears in discussions of its resistance to enzymatic breakdown.
Identity and purity are checked with standard peptide techniques. Reversed-phase high-performance liquid chromatography separates the main peak from closely related impurities and yields a percentage purity. Mass spectrometry confirms that the measured mass matches the theoretical value. Amino acid analysis offers an independent check on overall composition. These analytical methods characterize the material itself and reveal nothing about how it behaves in a living system.
In its common research form the peptide is supplied as a lyophilized powder. It dissolves readily in water and in typical aqueous buffers, which simplifies preparation of working solutions. Laboratories usually prepare small aliquots instead of one large volume. The dry material appears as a white to off-white solid with no distinctive odor. Bulk quantities are typically shipped in sealed vials.
Interpretation for secondary adrenal insufficiency ACTH will be low – usually below 35, but most people with secondary fall within the range limit. This is inappropriately normal for the low cortisol level. In some cases, the actual cause of low ACTH is from low CRH in the hypothalamus. It is possible to have separate ACTH and CRH impairment such as can happen in a head injury. The ACTH stimulation test is occasionally used to test adrenal production of aldosterone at the same time as cortisol to also help in determining if primary (hyperreninemic) or secondary (hyporeninemic) hypoaldosteronism is present. Human ACTH has a slight stimulatory effect on aldosterone, but the amount of synthetic ACTH given in the stimulation is equivalent to more than a whole days production of natural ACTH, so the aldosterone response can be easily measured in blood serum. Same as cortisol, aldosterone should double from a respectable base value (around 20 ng/dl, must fast salt 24 hours and sit upright for blood draw) in a healthy individual.
This detection method uses mammalian antibodies to bind to microbial toxins which can then be processed in a variety of different ways. Of the commercial ways of using immunochemical detection would be enzyme-linked immunosorbent assays (ELISA). This assay has the advantage of being able to screen for a broad range of toxins but could have issues with specificity depending on the antibody used. A more exotic setup involves the use of CdS quantum dots which are used in an electro-chemiluminescent immunosensor. A major aspect of immunochemical methods being tested in laboratories are uses of nanowires and other nanomaterials to detect microbial toxins.
26. Adv Gerontol. 2007;20(4):61-3. [The effect of pineal peptide preparations on proliferative activity in organotypic culture of the preoptic hypothalamus area]. [Article in Russian] Miliutina IuP, Kozina LS, Arutiunian AV, Chalisova NI, Lesniak VV, Morozova PIu. In investigations carried out with organotypic culture of mediobasal preoptic area (MPA) of hypothalamus it was established that pineal peptide preparations epitalon (2 ng/ml) and epithalamin (100 ng/ml) stimulate the development of proliferative activity of explants in 3 month and 24 months female rats. It has been shown that epithalamin is more effective in young rats in comparison with old animals, but epitalon as well as epithalamin have almost the same less pronounced inducing effect on growth zone in MPA explants from young and old animals. This effect is tissue specific and could be dependent on inhibition of apoptosis.
=== Reconstructive surgery === Collagens are widely used in the construction of artificial skin substitutes used for managing severe burns and wounds. These collagens may be derived from cow, horse, pig, or even human sources; and are sometimes used in combination with silicones, glycosaminoglycans, fibroblasts, growth factors, and other substances.
=== Cosmetics === Collagen is a protein found in many tissues of the body, such as cartilage, bone, tendons, and skin (including around hair follicles, and nail beds). Collagen cremes are marketed as cosmetics even though collagen cannot penetrate the skin because its fibers are too large. Partially hydrolyzed forms of collagen and low molecular weight collagen peptides, such as glycyl-prolyl-hydroxyproline, are more commonly used in cosmetics products than collagen itself in the unproven belief that topical absorption is improved. Skin aging involves changes in the extracellular matrix rather than changes in collagen alone. Intrinsic aging is associated with dermal thinning, loss and alteration of collagen, degeneration of the elastic fiber network, and reduced hydration. Chronic ultraviolet exposure further alters the organization of dermal collagen and elastic fibers, producing characteristic changes associated with photoaging. Because collagen and elastin contribute different mechanical properties to the dermal extracellular matrix, preservation of both networks is important for maintaining skin structure and elasticity.
Sources: en.wikipedia.org
== Characteristics == Collagen is one of the long, fibrous structural proteins whose functions are quite different from those of globular proteins, such as enzymes. Tough bundles of collagen called "collagen fibers" are a major component of the extracellular matrix that supports most tissues and gives cells structure from the outside, but collagen is also found inside certain cells. Collagen has great tensile strength and is the main component of fascia, cartilage, ligaments, tendons, bone, and skin. Along with elastin and soft keratin, it is responsible for skin strength and elasticity, and its degradation leads to wrinkles that accompany aging. In the skin, collagen and elastin have complementary roles within the extracellular matrix. Collagen provides tensile strength and structural support, whereas elastin is a major component of elastic fibers that enables the skin to stretch and return toward its original shape. With intrinsic aging and chronic ultraviolet exposure, both collagen and elastic fiber networks undergo structural and quantitative changes, contributing to reduced skin elasticity, wrinkles, and laxity. Studies of dermal tissue have identified changes in the density and organization of both collagen and elastin as characteristic features of intrinsic aging and photoaging. In the skin, collagen and elastin have complementary roles within the extracellular matrix: collagen provides tensile strength and structural support, whereas elastin is the principal component of elastic fibers that allows skin to stretch and recoil toward its original shape.
==== Lead replacement ==== The density difference between lead (11.32 g/cm3) and bismuth (9.78 g/cm3) is small enough that for many ballistics and weighting applications, bismuth can substitute for lead. For example, it can replace lead as a dense material in fishing sinkers. It has been used as a replacement for lead in shot, bullets, and less lethal riot gun ammunition. The Netherlands, Denmark, England, Wales, the United States, and many other countries now prohibit the use of lead shot for the hunting of wetland birds, as many birds are prone to lead poisoning owing to mistaken ingestion of lead (instead of small stones and grit) to aid digestion, or even prohibit the use of lead for all hunting, such as in the Netherlands. Bismuth-tin alloy shot is one alternative that provides similar ballistic performance to lead. Bismuth, as a dense element of high atomic weight, is used in bismuth-impregnated latex shields to shield from X-rays in medical examinations, such as CTs, mostly as it is considered nontoxic. The European Union's Restriction of Hazardous Substances Directive for reduction of lead has broadened bismuth's use in electronics as a component of low-melting-point solders, as a replacement for traditional tin-lead solders. Its low toxicity is especially important for solders to be used in food-processing equipment and copper water pipes, although it can also be used in other applications, including those in the automobile industry, in the European Union, for example.
=== North American media === Media in the U.S. and Canada have brought awareness to desomorphine. There have been incidents reported where desomorphine had supposedly been present within either country, but no incidents have been confirmed by any drug testing or analytical results, and desomorphine use in North America is still considered unconfirmed.
== Atomistic Fracture Mechanics == Atomistic Fracture Mechanics (AFM) is a relatively new field that studies the behavior and properties of materials at the atomic scale when subjected to fracture. It integrates concepts from fracture mechanics with atomistic simulations to understand how cracks initiate, propagate, and interact with the microstructure of materials. By using techniques like Molecular Dynamics (MD) simulations, AFM can provide insights into the fundamental mechanisms of crack formation and growth, the role of atomic bonds, and the influence of material defects and impurities on fracture behavior.
The treatment for a fistula varies depending on the type, cause, and severity of the fistula, but often involves surgical intervention combined with antibiotic therapy. In some cases the fistula is temporarily covered using a fibrin glue or plug. A catheter may be required to drain a fistula. Globally, every year between 50,000 and 100,000 women are affected by one or more fistulas relating to childbirth. Typically they are vaginal fistulas, between either the bowel or bladder and the vaginal canal, but uterine and bowel fistulas also occur. In botany, the term is most common in its adjectival forms, where it is used in binomial names to refer to a species that is distinguished by one or more hollow or tubular structures. Monarda fistulosa, for example, has tubular flowers. The term was first used in the 14th century.
Sources: en.wikipedia.org
This series of lists omits periods from acronyms and initialisms. It uses periods for certain abbreviations that traditionally often have them (mostly older Latin/Neo-Latin abbreviations). For example, both bid and b.i.d. may be found in the list. It generally uses the singular form of an abbreviation (not the plural) as the headword. This list uses significant capitalization for headwords (the abbreviations) and their expansions.
A day after his father's death, the National Assembly received clear instructions to dismiss Natchaba and elect Gnassingbé in his place, which would legalize his succession, which took place on 6 February 2005. Gnassingbé's election was unanimously approved by the deputies (98% of them were members of the ruling party) who were present in the National Assembly at the time; the opposition was not represented in the National Assembly due to its boycott of the 2002 parliamentary election. The members of Gnassingbé's then-party, the Rally of the Togolese People (RPT), did not want to challenge the army's choice. The parliament also eliminated a constitutional requirement that elections be held within 60 days of the president's death, enabling the younger Gnassingbé to rule until the expiration of his father's term in 2008. Under pressure from others in the region, and particularly Nigeria, later that month 2005, Gnassingbé announced that new elections would be held within 60 days, but said that he would remain in office in the meantime. However, on 21 February, the National Assembly reversed some of the constitutional changes that it had made so as to allow Gnassingbé to assume power, although it did not instruct him to resign. This was construed as a way of pressuring him to stand down with dignity. To change the constitution during a period of transition was itself an unconstitutional act, but this did not deter Gnassingbé's allies.
== Career == Townsend held various academic positions at the Medical University of South Carolina, starting as a Research Assistant Professor (2004) in the Department of Pharmaceutical Sciences. She was appointed as an associate professor in the Drug Discovery and Biomedical Sciences department in 2015 and has been serving as a Professor and acting department chair. In 2021, Townsend became the co-director of the Administrative Core for the Redox COBRE.
== Obligations and enforcement == The conventions are legally binding, effectively under the Vienna Convention on the Law of Treaties (VCLT). The INCB, charged with monitoring treaty compliance, relies primarily on direct discussion with individual countries to address non-compliance issues. Formal drug treaty disagreements between countries over issues such as treaty compliance and amendment, import-export, jurisdiction, and extradition, are addressed in dispute provisions in each of the conventions that call for remedies including negotiation, mediation, arbitration, judicial proceedings, or other "peaceful means", or turning to the International Court of Justice. Periodically, the UN General Assembly holds special session meetings on drugs that provide a normative framework for the drug conventions. Falling out of compliance with the conventions, apart from denunciation by the UN and other countries, could have practical consequences, particularly for developing nations. The conventions regulate trade in legal pharmaceuticals, including the WHO list of essential drugs—leaving the system could make securing medicine more difficult. Being party to the three conventions is also a requirement for certain trade agreements, and for access to the European Union (EU). Enforcement measures rely largely on dialog and diplomacy. The INCB, in addition to discussion, can call out perceived non-compliance in its reports and in public statements – "naming and shaming" – and by alerting the CND and ECOSOC. Beyond that, it has no practical enforcement power.
Sources: en.wikipedia.org
BPC-157 is a synthetic fifteen-amino-acid peptide whose sequence corresponds to a fragment of a protein found in human gastric juice. It is studied mainly in preclinical research and is not an approved pharmaceutical product in major markets. Materials sold for laboratory use are typically labelled as research chemicals.
No medicines regulator in the United States or the European Union has approved BPC-157 as a therapeutic product. Presenting it as a drug or as a dietary supplement ingredient would generally not match its regulatory status. Availability as a research chemical does not imply clinical approval.
Published reports rest largely on animal models and cell culture rather than controlled human trials. Review articles describe the proposed mechanisms as incompletely understood. Conclusions about effects in humans therefore remain tentative.
Low temperature slows the chemical reactions, such as oxidation and hydrolysis, that break down a peptide chain. Water and oxygen are the main drivers of degradation, so a cold and dry environment extends usable life. Actual shelf life depends on the batch, the salt form, and the container.