GHRH analogue raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-09-06 and is reviewed periodically as new material appears.
CJC-1295 belongs to a class of synthetic peptides modeled on growth hormone releasing hormone, a forty-four amino acid signal produced by the hypothalamus. The compound is built from the first twenty-nine residues of the natural sequence, with four substitutions introduced at positions 2, 8, 15 and 27. These changes were designed to slow enzymatic breakdown while preserving receptor activation. The result is a peptide that is shorter than native GHRH and considerably more resistant to ordinary clearance pathways in circulation.
Two related forms appear under the CJC-1295 name. The simpler analogue, commonly written as modified GRF(1-29), carries the four substitutions but no additional conjugation. The second form attaches a maleimidopropionic acid linker to a lysine residue, a modification frequently called the drug affinity complex. That linker reacts with the free thiol on serum albumin to form a covalent bond. Because albumin has a long residence time in blood, the conjugated peptide stays in circulation far longer than the unconjugated analogue.
Receptor level activity follows the canonical GHRH pathway. The peptide binds the GHRH receptor, a class B G protein coupled receptor on somatotroph cells of the anterior pituitary. Binding raises intracellular cyclic AMP, which promotes calcium entry and the release of growth hormone into the bloodstream. Because the molecule acts at the same receptor as the endogenous hormone, its effect is superimposed on the natural pulsatile rhythm rather than replacing it. Whether sustained receptor occupation leads to desensitization is not fully settled.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Peptide class | Synthetic GHRH analogue | Built on a 29 residue sequence |
| Primary target | GHRH receptor (GHRHR) | Class B G protein coupled receptor |
| Unconjugated half life | Minutes | Limited by protease degradation |
| Key modification | Four residue substitutions | Positions 2, 8, 15 and 27 |
| Common synonym | Modified GRF(1-29) | Usually denotes the form without DAC |
Binding of the peptide to the growth hormone-releasing hormone receptor on pituitary somatotrophs triggers a G protein coupled cascade that raises cyclic AMP and opens calcium channels. The result is greater secretion of growth hormone into the bloodstream. Because the peptide acts at the same receptor as the natural hypothalamic hormone, its effect is amplified pulse size rather than an entirely separate release pathway. Receptor binding alone does not determine the response, since somatostatin tone and other inputs modulate the final output.
The albumin-binding version stays in circulation for days, because covalent attachment to serum albumin shields the peptide from rapid filtration and degradation. Reported half-lives for this form fall in the range of several days. The version without the linker is cleared in minutes, with estimates often near thirty minutes in animal work. These figures come from small studies and vary with assay method, species, and route, so they are best read as approximate rather than fixed constants.
CJC-1295 acts at the growth hormone-releasing hormone receptor, a G-protein-coupled receptor found on somatotroph cells in the anterior pituitary. Binding triggers a rise in cyclic AMP and calcium entry, which promotes release of stored growth hormone. Because the peptide mimics the body's own releasing hormone, it amplifies existing secretory pulses rather than driving continuous output. The size of the response therefore depends partly on the subject's own hormonal rhythm and feedback state.
The attached maleimide group explains the unusual duration of the DAC version. After injection it reacts with the thiol of cysteine-34 on serum albumin, forming a stable covalent bond. The resulting conjugate is too large for rapid kidney filtration and is shielded from many peptidases. Reported half-lives for this form reach several days, whereas the version without the group is cleared in roughly half an hour. That gap is the main pharmacological difference between the two.
=== Foods === Sucrose esters are used as food additives in a variety of food. European Parliament and Council Directive No 95/2/EC limited the use of sucrose esters under E 473 in each kind of food. No longer in force, Date of end of validity: 20/01/2010; Repealed by 32008R1333 .
A tetrapeptide is a peptide, classified as an oligopeptide, since it only consists of four amino acids joined by peptide bonds. Many tetrapeptides are pharmacologically active, often showing affinity and specificity for a variety of receptors in protein-protein signaling. Present in nature are both linear and cyclic tetrapeptides (CTPs), the latter of which mimics protein reverse turns which are often present on the surface of proteins and druggable targets. Tetrapeptides may be cyclized by a fourth peptide bond or other covalent bonds. Examples of tetrapeptides are:
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Sources: en.wikipedia.org
South Africa did not compete at Olympic Games from 1964 to 1988, as a part of the sporting boycott of South Africa during the apartheid era. The South African National Olympic Committee (NOC) was expelled from the International Olympic Committee (IOC) in 1970. In 1991, as part of the transition to racial equality, South Africa was re-admitted to the IOC, and competed at the 1992 Summer Olympics held in Barcelona.
Your excellency, Mr President, I greet you in the name of the many thousands of people in Britain who stood against the tide and opposed the war ... I greet you too in the name of the Palestinian people ... I thought the president would appreciate knowing that even today, three years after the war, I still meet families who are calling their newborn sons Saddam ... Sir, I salute your courage, your strength, your indefatigability. And I want you to know that we are with you until victory, until victory, until Jerusalem (hatta al-nasr, hatta al-nasr, hatta al-Quds). During Galloway's 2004 defamation case against the Daily Telegraph, the paper's defence Queen's Counsel accused Galloway of having "fawned over" Saddam during their meeting in 1994. Labour leader John Smith said: "I deeply deplore the foolish statement made in Iraq by Mr. George Galloway. In no way did he speak for the Labour Party and I wholly reject his comments". Galloway said that he was saluting the Iraqi people, rather than Saddam Hussein, and Galloway's friend Anas Altikriti observed that this is how it was translated for Saddam. Shortly after his return, Galloway was given a "severe reprimand" and "final warning" by the Labour Chief Whip, Derek Foster. Galloway apologised for his conduct and undertook to follow future instruction from the whips. For his meeting with Saddam, Galloway was dubbed the "MP for Baghdad North". When he spoke before the U.S.
The industry was also affected by disputes about whether grain or blended whisky was worthy of the name, with an adverse decision in North London Police Court in 1905. A Royal Commission on Whisky and other Potable Spirits was appointed in 1906 and reported in 1909 with a victory for the grain distillers and blenders. The industry was further affected by World War I, Prohibition in the United States and later, by the Great Depression; many of the companies closed and never re-opened. Of the 159 distilleries operating in the boom years around 1900, only 15 survived to 1933. During the 1970s there was a new boom in Scotch whisky production that led to an overproduction in the early 1980s. Starting in 1981 whisky distilleries slashed production by a third and kept it low for a decade. During that time many distilleries closed. Banff, Brora, Coleburn, Convalmore, Dallas Dhu, Glen Albyn, Glenesk, Glen Flagler, Glenlochy, Glen Mhor, Glenugie, Glenury, Millburn, North Port, Port Ellen and St Magdalene were mothballed, shut down or demolished. Since the 2010s, Scotch whisky has entered a new phase of growth with new distilleries like Ardnahoe and Borders opening and older distilleries like Brora, Port Ellen and Rosebank reopening.
Sources: en.wikipedia.org
The names are often used interchangeably in casual writing, but they are not strictly identical. Modified GRF(1-29) refers to the unconjugated analogue carrying only the four substitutions. The version sold as CJC-1295 with DAC includes the albumin binding linker and clears much more slowly.
DAC stands for drug affinity complex, a term describing the maleimidopropionic acid linker. This group forms a covalent bond with the cysteine residue on serum albumin after administration. The resulting adduct is what extends the circulating half life from minutes to days.
No. It is entirely synthetic and does not correspond to any known endogenous peptide. The design starts from human growth hormone releasing hormone and introduces deliberate substitutions. Any biological effect comes from mimicking the natural hormone at its receptor.
The two share the same 29-amino-acid backbone. CJC-1295 carries an additional albumin-binding moiety that markedly extends its residence time in circulation, while the form without that moiety clears faster. Literature sometimes applies the name loosely to either variant.