This is a working overview of Cyclic AMP, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-08-25 and is reviewed periodically as new material appears.
CJC-1295 is a synthetic peptide modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. Its sequence corresponds to the first twenty-nine residues of human GHRH, with four substitutions that slow enzymatic breakdown. Early descriptions placed the compound in research on growth hormone deficiency and related conditions, and later literature groups it with the long-acting GHRH analogs. The name appears in both laboratory and popular fitness writing, where it sometimes labels chemically different peptides.
Two related peptides circulate under the CJC-1295 label, and they differ mainly in how long they persist in circulation. The version carrying a drug affinity complex includes a maleimidopropionic acid linker that forms a covalent bond with serum albumin. The other version, usually written as modified GRF(1-29) or tetrasubstituted GRF(1-29), lacks that linker and is cleared quickly. Mixing the two produces inconsistent readings of published half-life values, because the linker rather than the receptor-facing sequence drives most of the difference.
The core sequence keeps the receptor-binding region of GHRH while replacing four positions that are vulnerable to dipeptidyl peptidase-4 and other proteases. Substitutions at positions 2, 8, 15, and 27 raise metabolic stability relative to the natural hormone. The N-terminal residues remain essential for activity, so changes there generally lower potency. Molecular weight sits near 3368 daltons for the tetrasubstituted analog without the linker, while the albumin-binding form is heavier because of the added maleimide group.
Clearance profiles diverge sharply between the two versions. The albumin-binding molecule stays in plasma for several days, whereas the unmodified analog is largely gone within about half an hour in reported work. Cleavage by dipeptidyl peptidase IV is a major contributor to the short life of the unmodified sequence. These gaps mean the two versions cannot be substituted for each other in study design or in reading results side by side.
Reports on this compound commonly follow serum growth hormone and insulin-like growth factor 1 across defined time windows. Protocols differ in sampling frequency, assay platform, and participant characteristics, which makes direct comparison between publications difficult. Some work focuses on pulsatile release patterns instead of average concentrations. Whether repeated exposure alters endogenous hormone rhythms over long periods remains an open question, and the formal literature is thinner than the volume of informal commentary implies.
Once in circulation, the peptide binds the growth hormone-releasing hormone receptor displayed on pituitary somatotroph cells. Receptor activation couples to Gs proteins, elevates intracellular cyclic AMP, and drives protein kinase A signaling inside the cell. That cascade increases discharge of growth hormone into the bloodstream. The analog therefore operates through a receptor pathway that already exists for the body's own releasing hormone, rather than through an engineered artificial target.
| Property | Value | Notes |
|---|---|---|
| Class | Synthetic peptide | GHRH receptor agonist |
| Sequence length | 29 amino acids | Derived from human GHRH |
| Molecular weight | About 3368 Da without linker | Albumin-binding form is heavier |
| Appearance | White to off-white lyophilized powder | Common form for research reference material |
| Typical storage | -20 °C or below, desiccated | Protect powder from light and moisture |
Identity and purity are established with reversed phase high performance liquid chromatography coupled to mass spectrometry. The chromatographic step separates the target peptide from truncated sequences and deletion products, while the mass measurement confirms the expected molecular weight to within a fraction of a dalton. Because the two common variants differ by the presence of the linker, mass alone can distinguish them in the unconjugated state. Amino acid analysis and peptide mapping are used when sequence level confirmation is required.
Lyophilized material is generally stable for extended periods when held at minus twenty degrees Celsius or below and protected from moisture and light. In solution the peptide is more labile; bond hydrolysis, aggregation and oxidation of susceptible residues all proceed faster at ambient temperature. Repeated freeze and thaw cycles should be avoided because they promote clumping and loss of soluble material. The conjugated variant adds a further consideration, since the maleimide group can hydrolyze in aqueous buffer and lose its ability to react with albumin.
Laboratory handling centers on minimizing exposure to water, heat and oxygen before use. Working solutions are typically prepared in sterile water or a mild buffer, and any residual particulate matter is removed by filtration. When the powder dissolves slowly, a small proportion of acetonitrile or dilute acetic acid is sometimes added as a co-solvent. Containers are kept sealed and desiccated between uses. Records of lot number, reconstitution date and storage conditions support later comparison of results across experiments.
The drug affinity complex is a maleimidopropionic acid group attached to a lysine side chain. It reacts with the free thiol of cysteine-34 on circulating albumin, forming a covalent bond. This conjugation keeps the peptide in the bloodstream and shields it from rapid renal filtration and proteolysis. Reported circulation half-lives for the albumin-bound form fall in the range of roughly six to nine days in early human studies.
Binding to GHRH receptors on pituitary somatotroph cells triggers cyclic AMP signaling and stimulates growth hormone synthesis and release. Because the peptide acts upstream of the pituitary, effects are mediated through endogenous growth hormone rather than direct receptor activation in peripheral tissues. Increases in insulin-like growth factor 1 are generally described as a downstream consequence. Most published human exposure data come from small early-stage studies, and the clinical significance of the pharmacokinetic profile remains incompletely characterized.
CJC-1295 is a synthetic analogue of growth hormone-releasing hormone, built on the 29-amino-acid GHRH(1-29) fragment. Four substitutions distinguish it from the natural sequence: D-alanine at position 2, glutamine at position 8, alanine at position 15, and leucine at position 27. These changes reduce enzymatic cleavage and extend the peptide's persistence in circulation. The compound is discussed in two forms, one carrying a drug affinity complex and one without it.
== Further reading == Boie F (1827). Bemerkungen über Merrem's Versuch eines Systems der Amphibien, 1te Lieferung: Ophidier. Isis von Oken 20: 508-566. (Cophias wagleri, new species, p. 562). (in German). Boulenger GA (1896). Catalogue of the Snakes in the British Museum (Natural History). Volume III., Containing the ... Viperidæ. London: Trustees of the British Museum (Natural History). (Taylor and Francis, printers). xiv + 727 pp. + Plates I-XXV. (Lachesis wagleri, pp. 562–564).
Plague of Justinian, from 541 to 542, killed between 50% and 60% of Europe's population. The Black Death of 1347 to 1352 killed 25 million in Europe over five years. The plague reduced the old world population from an estimated 450 million to between 350 and 375 million in the 14th century. The introduction of smallpox, measles, and typhus to the areas of Central and South America by European explorers during the 15th and 16th centuries caused pandemics among the native inhabitants. Between 1518 and 1568 disease pandemics are said to have caused the population of Mexico to fall from 20 million to 3 million. The first European influenza epidemic occurred between 1556 and 1560, with an estimated mortality rate of 20%. Smallpox killed an estimated 60 million Europeans during the 18th century (approximately 400,000 per year). Up to 30% of those infected, including 80% of the children under 5 years of age, died from the disease, and one-third of the survivors went blind. In the 19th century, tuberculosis killed an estimated one-quarter of the adult population of Europe; by 1918 one in six deaths in France were still caused by TB. The Influenza Pandemic of 1918 (or the Spanish flu) killed 25–50 million people (about 2% of world population of 1.7 billion). Today Influenza kills about 250,000 to 500,000 worldwide each year. In 2021, COVID-19 emerged as a major global health crisis, directly causing 8.7 million deaths, making it one of the leading causes of mortality worldwide.
The Maillard reaction ( MY-ar(d); French: [majaʁ]) is a chemical reaction between amino acids and reducing sugars to create melanoidins, the compounds that give browned food its distinctive flavor. Seared steaks, fried dumplings, cookies and other kinds of biscuits, breads, toasted marshmallows, falafel and many other foods undergo this reaction. It is named after French chemist Louis Camille Maillard, who first described it in 1912 while attempting to reproduce biological protein synthesis. The reaction is a form of non-enzymatic browning which typically proceeds rapidly from around 140 to 165 °C (280 to 330 °F). Many recipes call for an oven temperature high enough to ensure that a Maillard reaction occurs. At higher temperatures, caramelization (the browning of sugars, a distinct process) and subsequently pyrolysis (final breakdown leading to burning and the development of acrid flavors) become more pronounced. The reactive carbonyl group of the sugar reacts with the nucleophilic amino group of the amino acid and forms a complex mixture of poorly characterized molecules responsible for a range of aromas and flavors. This process is accelerated in an alkaline environment (e.g., lye applied to darken pretzels; see lye roll), as the amino groups (RNH+3 → RNH2) are deprotonated, and hence have an increased nucleophilicity. This reaction is the basis for many of the flavoring industry's recipes. At high temperatures, a probable carcinogen called acrylamide can form. This can be discouraged by heating at a lower temperature, adding asparaginase, or injecting carbon dioxide.
Pascal's law (also Pascal's principle or the principle of transmission of fluid-pressure) is a principle in fluid mechanics that states that a pressure change at any point in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere. The law was established by French mathematician Blaise Pascal in 1653 and published in 1663.
Sources: en.wikipedia.org
The birth of most Mexican drug cartels is traced to former Mexican Judicial Federal Police agent Miguel Ángel Félix Gallardo (Spanish: El Padrino, lit. 'The Godfather'), who founded the Guadalajara Cartel in 1980 and controlled most of the illegal drug trade in Mexico and the trafficking corridors across the Mexico–U.S. border along with Juan García Ábrego throughout the 1980s. He started by smuggling marijuana and opium into the U.S., and was the first Mexican drug chief to link up with Colombia's cocaine cartels in the 1980s. Through his connections, Félix Gallardo became the person at the forefront of the Medellín Cartel, which was run by Pablo Escobar. This was accomplished because Félix Gallardo had already established a marijuana trafficking infrastructure that stood ready to serve the Colombia-based cocaine traffickers. There were no other cartels at that time in Mexico. He oversaw operations with his cronies and the politicians who sold him protection. The Guadalajara Cartel suffered a major blow in 1985 when the group's co-founder Rafael Caro Quintero was captured, and later convicted, for the murder of DEA agent Enrique "Kiki" Camarena. Félix Gallardo then kept a low profile and in 1987 he moved with his family to Guadalajara. According to Peter Dale Scott, the Guadalajara Cartel prospered largely because it enjoyed the protection of the Dirección Federal de Seguridad (DFS), under its chief Miguel Nazar Haro. Félix Gallardo was arrested on April 8, 1989.
== Applications == TMU is miscible with a variety of organic compounds, including acids (e.g. acetic acid), bases (e.g. pyridine), and organic substances (e.g. ε-caprolactam, benzoic acid). TMU can also dissolve some inorganic salts such as silver nitrate and sodium iodide. TMU is often used in place of hexamethylphosphoramide (HMPA), which is a suspected carcinogen. TMU is suitable as a reaction medium for the polymerization of aromatic diacid chlorides (such as isophthalic acid) and aromatic diamines (such as 1,3-diaminobenzene (m-phenylenediamine)) to aramids such as poly (m-phenylene isophthalamide) (Nomex) The polymerization of 4-amino benzoic acid chloride hydrochloride in TMU provides isotropic viscous solutions of poly(p-benzamide) (PPB), which can be directly spun into fibers.
Phenotypes of overlap between Ullrich congenital muscular dystrophy (UCMD) and Bethlem myopathy can be assumed. In the differential diagnosis of UCDM, even in patients without finger contractures, Bethlem myopathy could be considered.
Sources: en.wikipedia.org
The canal remained a remote and sparsely populated wilderness, unchanged over centuries. The Upper Orinoco, at its junction with the Casiquiare, was over a thousand miles from the sea and still more than a quarter mile wide. The expedition proceeded to Esmeralda, a remote mission at the foot of the Sierra Duida. The settlement was isolated and regarded as a place of hardship, plagued by insects and food shortages. Esmeralda was famous for the production of curare, a potent poison prepared by local Natives. Humboldt and Bonpland observed its preparation and collected samples, narrowly avoiding accidental poisoning. Hostile indigenous groups upriver from Esmeralda forced the party to abandon plans to explore the Orinoco’s source. Weakened by insects, poor food, and cramped conditions, the expedition left Esmeralda on 23 May. They traveled rapidly downstream, reaching the Atures rapids by the end of May. Humboldt visited the cavern of Ataruipe, discovering hundreds of well-preserved Native skeletons. He collected several for scientific study, which later caused difficulties with locals who recognized the resin used in their preparation. The expedition passed through the rapids for the last time. Father Zea left to rejoin his mission. Many of the local Natives suffered from illness. Bonpland soon fell sick but continued to collect plants despite worsening health. In early June, the group reached Uruana and encountered the Ottomac people. Humboldt described them as unruly, hard to govern, and addicted to a hallucinogenic drug.
== Chairman of the Transitional Sovereignty Council (2021–present) == On 25 October 2021, al-Burhan led the October 2021 Sudanese coup d'état to overthrow the civilian government of Prime Minister Abdalla Hamdok. On 21 November 2021, all political prisoners were freed and Abdalla Hamdok was reinstated as prime minister as part of an agreement with the civilian political parties. Hamdok was also allowed to return leading the transitional government. After the coup, Burhan integrated Islamists into sources of power, in particular the SAF. Muslim Brotherhood members who had been active under the Bashir regime became among the principal supporters of al-Burhan and his rule. On 4 December 2021, al-Burhan told Reuters in an interview that the Sudanese military will "exit politics" following the elections scheduled for July 2023, stating, "When a government is elected, I don't think the army, the armed forces, or any of the security forces will participate in politics. This is what we agreed on and this is the natural situation." On 9 December 2021, al-Burhan warned of possible measures against foreign diplomatic missions for their alleged incitement against the Sudanese army. He also reiterated his commitment to the political agreement struck with Prime Minister Hamdok in November 2021. On 20 December 2021, al-Burhan voiced his support for Hamdok, adding that recent appointments had been made as the result of coordination between him and the prime minister and in line with the 21 November 2021 political agreement.
In October 2006, the company announced it would acquire PowerMed. On October 15, 2009, Pfizer acquired Wyeth for $68 billion in cash and stock, including the assumption of debt, making Pfizer the largest pharmaceutical company in the world. The acquisition of Wyeth provided Pfizer with a pneumococcal conjugate vaccine, trademarked Prevnar 13; this is used for the prevention of invasive pneumococcal infections. The introduction of the original, 7-valent version of the vaccine, developed by Wyeth in February 2000, led to a 75% reduction in the incidence of invasive pneumococcal infections among children under age 5 in the United States. Pfizer introduced an improved version of the vaccine in 2010, for which it was granted a patent in India in 2017. Prevnar 13 provides coverage of 13 bacterial variants, expanding beyond the original 7-valent version. By 2012, the rate of invasive infections among children under age 5 had been reduced by an additional 50%.
On 1 April 1974, Powys was created under the Local Government Act 1972. At first, the former administrative counties of Montgomery, Radnor, and Brecknock were districts within it. On 1 April 1996, the districts were abolished, and Powys was reconstituted as a unitary authority. There was a minor border adjustment in the northeast—specifically, the addition of the communities of Llansilin and Llangedwyn from Glyndŵr district in Clwyd—and with moving the border, so that rather than half of Llanrhaeadr-ym-Mochnant, all is included. The first Lord Lieutenant of Powys was previously the Lord Lieutenant of Montgomeryshire. The Lord Lieutenant of Brecknockshire and Lord Lieutenant of Radnorshire were appointed as lieutenants. The present lord lieutenant is Shân Legge-Bourke of Crickhowell.
Sources: en.wikipedia.org
Natural GHRH is degraded quickly by dipeptidyl peptidase-4 and related enzymes, giving it a half-life measured in minutes. CJC-1295 carries substitutions that slow that breakdown, so it stays intact longer. Both act at the same pituitary receptor and produce the same class of signal.
The label was first attached to the albumin-binding form during early development work. A shorter analog without the linker later became known by the same name in informal use. Published papers normally state which version was studied, so the methods section resolves the ambiguity.
It is a synthetic peptide rather than a steroid, and it does not occur naturally in the body. Its sequence is derived from a hypothalamic hormone called growth hormone-releasing hormone. It works as a receptor agonist rather than as a replacement for that hormone.
It acts on the growth hormone-releasing hormone receptor found on pituitary somatotroph cells. Activation of that receptor triggers growth hormone release through a cyclic AMP dependent pathway.