The short version of GHRH fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-07-27 and is reviewed periodically as new material appears.
Two principal forms appear in the literature and in research supply. One carries a drug affinity complex, a maleimide-based group that forms a covalent bond with circulating albumin. This linkage slows clearance and produces a long-lasting elevation of peptide levels. The other form lacks that group and is often labeled MOD GRF(1-29). It has a much shorter circulation time. Both variants retain the same core receptor-binding sequence. Reported half-lives differ substantially between the two.
At the pituitary, the peptide binds the growth hormone-releasing hormone receptor on somatotroph cells. Receptor activation raises intracellular cyclic AMP and triggers release of stored growth hormone. Somatostatin and other hypothalamic signals modulate this response. Negative feedback from insulin-like growth factor 1 also influences output. The same regulatory architecture operates with the native hormone. Whether the synthetic analog alters feedback dynamics over repeated exposure remains an open question. Most published receptor work uses cell models rather than intact human systems.
Naming in this area is inconsistent, and readers should treat product labels with care. In much of the literature and in vendor catalogs, the unqualified term refers to the albumin-binding version, while the version lacking the DAC group appears as modified GRF(1-29), mod GRF(1-29), or the same name with a without-DAC qualifier. Because one abbreviation has been applied to both materials, the only reliable way to identify a sample is to check the stated sequence and the presence of the linker.
CJC-1295 is the name used for a synthetic peptide modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. The compound was described by a Canadian drug discovery company in the mid-2000s as a long-acting research tool. Two closely related molecules share the name in practice: one carries a drug affinity complex, or DAC, group, and one does not. The distinction matters because the two behave differently in circulation.
| Property | Value | Notes |
|---|---|---|
| Molecular weight, DAC form | About 3647 Da | Varies with salt form |
| Molecular weight, non-DAC form | About 3358 Da | MOD GRF(1-29) |
| Solubility class | Water soluble | Also dissolves in polar solvents |
| Reported half-life, DAC form | About five to eight days | Values from human studies |
| Common synonyms | CJC-1295; MOD GRF(1-29) | Name depends on variant |
Two related forms circulate in technical discussion under the same family name. The original version carries a drug affinity complex (DAC) that binds covalently to serum albumin after administration, and this linkage substantially extends circulation time. A second form, frequently written as modified GRF(1-29) or CJC-1295 without DAC, lacks that linker and clears much faster. The naming is a frequent source of confusion because the shorthand CJC-1295 can refer to either form depending on the source. Reports sometimes fail to specify which variant was studied.
The peptide backbone includes a D-alanine at position two, which resists cleavage by dipeptidyl peptidase IV, and several other substitutions that reduce degradation. Its molecular weight is roughly 3.4 kDa without the linker and about 3.6 kDa with it. The molecule is water soluble and is normally supplied as a lyophilized powder. Precise sequence and mass values depend on which variant is described, so technical documents usually state the exact form being referenced.
CJC-1295 is a synthetic peptide designed to mimic growth hormone-releasing hormone (GHRH), the endogenous signal that prompts the pituitary gland to release growth hormone. The compound is a modified fragment of the natural hormone, spanning the first twenty-nine amino acids of GHRH with several substitutions that slow enzymatic breakdown. Two variants circulate in research settings: one carrying a drug affinity complex (DAC) and one without it. The DAC-free form is frequently labelled Mod GRF(1-29) in catalogs and discussion forums.
The peptide binds GHRH receptors on somatotroph cells within the anterior pituitary, triggering a signalling cascade that increases growth hormone secretion. Its improved resistance to dipeptidyl peptidase IV degradation distinguishes it from the parent hormone. In the DAC-bearing version, a maleimide group reacts with a cysteine residue on serum albumin, forming a covalent bond that keeps the peptide in circulation far longer. That albumin attachment is the central design feature separating the two research variants.
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.
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.
== Reactivity == One of the cytochrome P450 isozymes is coded by the gene CYP2B1, where hexobarbital is the substrate. Hexobarbital and the isozyme can form an enzyme-substrate-complex through a hydroxylation reaction, which is involved in the metabolism of xenobiotics. the concentration of hexobarbital also plays a role in oxygenase and oxidase activity of hepatic microsomal cytochrome P450. Triacetyl oleandomycin, an inhibitor for isozyme CYP3A4, also inhibits hexobarbital metabolism and biological activity, indicating a close relationship between hexobarbital and cytochrome P450.
Following the dismissal of the Bellido cabinet, the new Vásquez cabinet hoped to replace Bellido's ultra-confrontational approach to Congress with a more conciliatory approach. Prime Minister Mirtha Vásquez held a meeting with members of Congress to negotiate on the question of trust and the presidential impeachment. Vásquez proposed a new version of the question of trust which she claimed would not cause an imbalance of power. However, it became clear that Congress would stick to their own bill. Free Peru's ally, Together for Peru, proposed a bill that would dissolve Congress if the President was impeached for moral or physical incapacity. Following that, new parliamentary elections would be held. The bill failed to pass. On 22 October 2021, the government presented a lawsuit before the Constitutional Court (CT) that Congress' reinterpretation of the question of confidence was unconstitutional. The CT unanimously admitted the case on 28 October 2021. On 2 November 2021, Eloy Espinosa-Saldaña, who was appointed rapporteur of the case, asked Congress to quickly respond to the lawsuit. Meanwhile, the Minister of Justice, Aníbal Torres, claimed that if the CT respected its past judgements, it should declare the unconstitutionality of the law that reinterprets the question of trust. On 16 November 2021, Congress formalized changes that would allow itself to reject a question of confidence as inadmissible if it's not in line with the restrictions previously passed by itself. Said restrictions are currently being challenged in the Constitutional Court.
Brian David Strahl (born 1970) is an American biochemist and molecular biologist. He is currently a professor in the Department of Biochemistry & Biophysics at the University of North Carolina at Chapel Hill. Strahl is known for his research in the field of chromatin biology and histone modifications. Strahl, with C. David Allis proposed the “histone code hypothesis”.
== History == The term "narcotic" is believed to have been coined by the Greek physician Galen to refer to agents that numb or deaden, causing paralysis or loss of feeling. It is based on the Greek word ναρκωσις (narcosis), the term used by Hippocrates for the process of numbing or the numbed state. Galen listed mandrake root, altercus (eclata), seeds, and poppy juice (opium) as the chief examples. It originally referred to any substance that relieved pain, dulled the senses, or induced sleep. Now, the term is used in many ways. Some people might define narcotics as substances that bind at opioid receptors (cellular membrane proteins activated by substances like heroin or morphine), while others refer to any illicit substance as a narcotic. From a U.S. legal perspective, narcotics refer to opium, opium derivatives, and their semi-synthetic substitutes, though in U.S. law, due to its numbing properties, cocaine is also considered a narcotic. The definition encompassing "any illegal drug" was first recorded in 1926. Its first use as an adjective is first attested to c. 1600. There are many different types of narcotics. The two most common forms of narcotic drugs are morphine and codeine. Both are synthesized from opium for medicinal use. The most commonly used drug for recreational purposes created from opium is heroin. Synthesized drugs created with an opium base for use in pain management are fentanyl, oxycodone, tramadol, pethidine (Demerol), hydrocodone, methadone, and hydromorphone. New forms of existing pain medications are being created regularly.
== Mechanism of action == Copanlisib is an inhibitor of phosphatidylinositol-3-kinase (PI3K) with inhibitory activity predominantly against PI3K-α and PI3K-δ isoforms expressed in malignant B-cells. It has been shown to induce tumor cell death by apoptosis and inhibition of proliferation of primary malignant B cell lines.
Sources: en.wikipedia.org
Isobutyryl-CoA + 6 malonyl-CoA +12 NADPH + 12H+ → Isopalmitic acid + 6 CO2 12 NADP + 5 H2O + 7 CoA The difference between (straight-chain) fatty acid synthase and branch-chain fatty acid synthase is substrate specificity of the enzyme that catalyzes the reaction of acyl-CoA to acyl-ACP.
A considerable number of those killed during the uprising were killed by protestors in acts of vigilante justice, including in some cases by necklacing, although many others were killed by state security forces or by rival vigilantes. Opposition to black local authorities constituted an intersection between local and socioeconomic grievances, on the one hand, and broad opposition to apartheid, on the other. Many of the civic and student organisations which drove the protests – among them the Congress of South African Students – were formally or informally aligned to the United Democratic Front (UDF), which in turn was aligned to the exiled African National Congress (ANC). Although there remains debate about the extent to which the UDF and ANC provided the organisational and strategic impetus for the uprising, their anti-apartheid ideology and symbols were given prominent place. The government met the uprising with severity, deploying the South African Defence Force to police the townships from October 1984. A partial state of emergency was enforced in the Transvaal and Cape Province from July 1985, extended in October 1985, and then surpassed in June 1986 by a stronger state of emergency, which applied across the country and remained in place for four years thereafter. The national state of emergency is viewed as having dampened the uprising by the end of 1986, but continuous protest and intermittent violence remained a feature of township life until negotiations to end apartheid were completed in 1994.
O-GlcNAc transferase is part of a dynamic competition for a serine or threonine hydroxyl functional group in a peptide unit. Figure 3 shows an example of both reciprocal same-site occupancy and adjacent-site occupancy. For the same-site occupancy, OGT competes with kinase to catalyze the glycosylation of the protein instead of phosphorylation. The adjacent-site occupancy example shows the naked protein catalyzed by OGT converted to a glycoprotein, which can increase the turnover of proteins such as the tumor repressor p53. The post-translational modification of proteins by O-GlcNAc is spurred by glucose flux through the hexosamine biosynthetic pathway. OGT catalyzes attachment of the O-GlcNAc group to serine and threonine, while O-GlcNAcase spurs sugar removal. This regulation is important for multiple cellular processes including transcription, signal transduction, and proteasomal degradation. Also, there is competitive regulation between OGT and kinase for the protein to attach to a phosphate group or O-GlcNAc, which can alter the function of proteins in the body through downstream effects. OGT inhibits the activity of 6-phosophofructosekinase PFKL by mediating the glycosylation process. This then acts as a part of glycolysis regulation. O-GlcNAc has been defined as a negative transcription regulator in response to steroid hormone signaling. Studies show that O-GlcNAc transferase interacts directly with the Ten eleven translocation 2 (TET2) enzyme, which converts 5-methylcytosine to 5-hydroxymethylcytosine and regulates gene transcription.
== Etymology == The name derives from the Ancient Greek word πολύς (polus, meaning "many, much") and the word 'phenol' which refers to a chemical structure formed by attachment of an aromatic benzenoid (phenyl) ring to a hydroxyl (-OH) group (hence the -ol suffix). The term "polyphenol" has been in use at least since 1894.
Sources: en.wikipedia.org
=== Biomedical applications === Quantitative proteomics has distinct applications in the medical field. Especially in the fields of drug and biomarker discovery. LC-MS/MS techniques have started to over take more traditional methods like the western blot and ELISA due to the cumbersome nature of labeling different and separating proteins using these methods and the more global analysis of protein quantification. Mass spectrometry methods are more sensitive to difference in protein structure like post-translational modification and thus can quantify differing modifications to proteins. Quantitative proteomics can circumvent these issues, only needing sequence information to be performed. It can be applied on a global proteome level, or on specifically isolating binding partners in pull-down or affinity purification experiments. Disadvantages, however, in sensitivity and analysis time must be kept in consideration.
=== Mechanism of action === Posaconazole works by disrupting the functions of certain fungal and protozoal membrane-bound enzyme systems. It does this by blocking the synthesis and turnover of the eukaryotic cell membrane component ergosterol via the inhibition of an enzyme known as CYP51. Posaconazole is significantly more potent at binding to CYP51 than itraconazole.
The report also finds over 400,000 New Zealanders receiving welfare. McDonald's New Zealand is denied resource consent to build a restaurant in Wānaka due to strong local opposition. 13 February: The Public Service Association challenges Health New Zealand's proposed digital and IT job cuts, claiming they breached employment law. Crown Research Institute Callaghan Innovation proposes slashing 63 jobs in response to Government plans to disestablish the organisation. 14 February – Director-General of Health Diana Sarfati resigns. 15 February: A bush fire in North Canterbury causes a section of State Highway 7 to close and several homes to evacuate. Members of Destiny Church's "Man Up" group disrupt a "Pride and Rainbow" event at Te Atatū's library. The church's actions were condemned by Prime Minister Luxon, Mayor of Auckland Wayne Brown, Acting Waitematā District Commander Inspector Simon Walker and Labour leader Chris Hipkins. Foreign Minister Winston Peters announces that New Zealand will be considering the newly ratified Chinese–Cook Islands strategic partnership agreement in light of its national interests and constitutional relationship with the Cook Islands. 17 February: The New Zealand Police launch an investigation into assault complaints during a protest by Destiny Church members against a rainbow event at Te Atatū's library. Immigration New Zealand temporarily suspends deportation proceedings against New Zealand-born teenager Daman Kumar and his mother Sunita Devi (who both hold Indian citizenship) pending a ministerial review.
Sources: en.wikipedia.org
It is a synthetic peptide modeled on growth hormone-releasing hormone. The molecule is used in research on pituitary growth hormone secretion. It differs from the natural hormone through several stabilizing substitutions.
The DAC form carries a maleimide group that binds albumin and extends circulation time. The non-DAC form lacks this group and clears much faster. Both share the same receptor-binding core.
It targets the growth hormone-releasing hormone receptor on pituitary somatotroph cells. Activation raises cyclic AMP and promotes growth hormone release. Normal feedback pathways remain part of the response.
No. It is a laboratory-made analog of growth hormone-releasing hormone. The natural hormone is a 44-residue peptide, while the analog is built on a shorter 29-residue fragment.