GHRH analogue 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 2025-08-17. Numbers and descriptions here follow the published literature rather than marketing material.
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 as a long-acting analogue of growth hormone-releasing hormone (GHRH). Its structure derives from the first 29 amino acids of native GHRH, a fragment often called GRF(1-29). Four substitutions were introduced to slow enzymatic breakdown and extend activity relative to the natural sequence. The compound was developed by ConjuChem as part of a broader effort to improve the pharmacokinetic profile of peptide hormones. It is studied in laboratory and clinical research settings rather than appearing as a naturally occurring substance.
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.
Downstream of growth hormone, the liver and other tissues increase production of insulin-like growth factor 1, a mediator of many growth-promoting effects. Studies have documented elevated levels of both hormones after dosing, and the rise from the long-acting form persists longer than that produced by shorter-acting analogues. What remains unclear is whether sustained elevation of these markers translates into meaningful clinical benefit, and whether prolonged exposure carries risks that short trials could not detect.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular weight (no linker) | ~3.37 kDa | Calculated from peptide sequence |
| Molecular weight (with linker) | ~3.65 kDa | Includes albumin-binding moiety |
| Appearance | White to off-white powder | Typically lyophilized |
| Solubility | Soluble in water | Also dissolves in aqueous buffers |
| Common synonyms | Modified GRF(1-29), DAC:GRF | Usage varies by source |
Studies in this area generally track growth hormone pulses, insulin-like growth factor 1 concentrations, and occasionally body composition endpoints. Most published human data come from early, small trials, and questions about long-term effects remain open. Whether repeated exposure alters pituitary responsiveness over time is not settled. Analytical work relies on immunoassays for the hormones and on mass spectrometry for the peptide itself, because the two measurements answer different questions.
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 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.
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 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.
Deeper water is preferable, to avoid issues related with dynamic loading. Ice along shorelines and above shoals is prone to fracturing. Avoid areas where there are strong water currents, or next to the mouth of small rivers and creeks. The temperature at the ice-water interface being 0 °C (32 °F), flow of water at a slightly higher temperature will thermally erode that interface, thereby reducing the ice thickness. Consider the effects of water level changes, for instance upstream of a water body regulated by dams. A review of historical ice conditions, using local knowledge and satellite imagery, can help decipher recurrent problematic areas, such as ice ridging. Before first access to the ice, the following factors need to be considered:
The converse happens when the plasma pH rises above normal: bicarbonate ions are excreted into the urine, and hydrogen ions released into the plasma. When hydrogen ions are excreted into the urine, and bicarbonate into the blood, the latter combines with the excess hydrogen ions in the plasma that stimulated the kidneys to perform this operation. The resulting reaction in the plasma is the formation of carbonic acid which is in equilibrium with the plasma partial pressure of carbon dioxide. This is tightly regulated to ensure that there is no excessive build-up of carbonic acid or bicarbonate. The overall effect is therefore that hydrogen ions are lost in the urine when the pH of the plasma falls. The concomitant rise in the plasma bicarbonate mops up the increased hydrogen ions (caused by the fall in plasma pH) and the resulting excess carbonic acid is disposed of in the lungs as carbon dioxide. This restores the normal ratio between bicarbonate and the partial pressure of carbon dioxide and therefore the plasma pH. The converse happens when a high plasma pH stimulates the kidneys to secrete hydrogen ions into the blood and to excrete bicarbonate into the urine. The hydrogen ions combine with the excess bicarbonate ions in the plasma, once again forming an excess of carbonic acid which can be exhaled, as carbon dioxide, in the lungs, keeping the plasma bicarbonate ion concentration, the partial pressure of carbon dioxide and, therefore, the plasma pH, constant.
Three of the company's stores in Buffalo, New York began an attempt to unionize in August 2021. Using Twitter, the workers announced they had formed an organizing committee, Starbucks Workers United, to form a union affiliated with Workers United. Two more stores joined the effort in September, however these petitions were later withdrawn to ensure a speedy process for the original three locations. During the union drive, the company sent other managers and executives, including its North America retail president, to Buffalo to engage with employees about operational issues and participate in their work. Employees were forced to attend captive audience meetings that contained anti-union messages. Starbucks temporarily closed some area stores for remodeling and added excessive staff to one of the stores preparing to vote. Workers said this reduced union support there, while Starbucks said the support was meant to compensate for increased sick leave during the pandemic as it had done elsewhere in the country. On November 9 Workers United filed three more petitions for elections to represent workers at additional Buffalo area stores. On November 10 the National Labor Relations Board mailed out votes for the elections at the original three locations. Votes for the original three stores were counted on December 9. Days before the vote count, the NLRB rejected arguments by Starbucks to halt the election.
Defender – 16 Half-back – 14 Midfielder – 49 Half-forward – 22 Forward – 19 Ruckman – 10 Utility – 3 The TAC Cup was the league with the highest number of players drafted, with forty-five in total. The Dandenong Stingrays in the TAC Cup had the most players drafted out of any team with seven players.
Sources: en.wikipedia.org
===== Nuclear Magnetic Resonance ===== To analyze the full structure of a nascent polypeptide, nuclear magnetic resonance (NMR) is used. NMR allows a dynamic view of molecules in solution and so can be used on ribosome-nascent chain complexes (RNC). Labelling of ribosomes allows the NMR data to be filtered for suspected ribosome signal and identify the signal of the nascent polypeptide.
Dane salt formation between 3,5-dimethoxyaniline and ethyl acetoacetate followed by borohydrate reduction gives synthon 1. The amino group is protected by rxn with ethyl chloroformate, the ester group is saponified, and then cyclodehydration with polyphosphoric acid leads to the dihydroquinoline ring system (2). Deblocking with HBr is followed by etherification of the nonchelated phenolic hydroxyl gives 3. Treatment with NaH and ethyl formate results in both N-formylation and C-formylation of the active methylene to give 4. Michael addition of methyl vinyl ketone (MVP) followed by successive base treatments to remove the activating C-formyl group and then to complete the Robinson annulation to give 5. Lithium in liquid ammonia reduces the olefinic linkage and successive acetylation and sodium borohydrate reductions complete the synthesis of nantradol (6).
1 July Scientists show why climate benefits from nature restoration are "dwarfed by the scale of ongoing fossil fuel emissions". A new CRISPR gene editing/repair tool alternative to fully active Cas9 is reported – Cas9-derived nickases mediated homologous chromosome-templated repair, applicable to organisms whose matching chromosome has the desired gene/s, which is demonstrated to be more effective than Cas9 and cause fewer off-target edits. 4 July – Scientists report that heatwaves in western Europe are increasing "three-to-four times faster compared to the rest of the northern midlatitudes over the past 42 years" and that certain atmospheric dynamical changes can explain their increase. 5 July – The Large Hadron Collider commences its Run 3 physics season. The LHCb collaboration observes three never-before-seen particles: a new kind of "pentaquark" and the first-ever pair of "tetraquarks", which includes a new type of tetraquark. Scientists based in Bengaluru’s Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) have found a novel substance termed “single-crystalline scandium nitride” that can transform infrared light into renewable energy. 6 July – A study suggests that the marginal effectiveness of a fourth COVID-19 vaccine dose (a second "booster") versus three doses can be 40% (24% to 52%) against severe disease outcomes. There is no scientific consensus about the efficacy and overall recommendabilities of a fourth dose. The CDC recommended such in March only for "certain immunocompromised individuals and people over the age of 50".
Compound characterization with TLC is also possible and is similar to reaction monitoring. However, rather than spotting with starting material and reaction mixture, it is with an unknown and a known compound. They may be the same compound if both spots have the same RF and look the same under the chosen visualization method. However, co-elution complicates both reaction monitoring and characterization. This is because different compounds will move to the same spot on the plate. In such cases, different solvent mixtures may provide better separation.
This active-centre specificity of inhibition was also evident in the many other families of protease inhibitors but the serpins differed from them in being much larger proteins and also in possessing what was soon apparent as an inherent ability to undergo a change in shape. The nature of this conformational change was revealed with the determination in 1984 of the first crystal structure of a serpin, that of post-cleavage alpha1-antitrypsin. This together with the subsequent solving of the structure of native (uncleaved) ovalbumin indicated that the inhibitory mechanism of the serpins involved a remarkable conformational shift, with the movement of the exposed peptide loop containing the reactive site and its incorporation as a middle strand in the main beta-pleated sheet that characterises the serpin molecule. Early evidence of the essential role of this loop movement in the inhibitory mechanism came from the finding that even minor aberrations in the amino acid residues that form the hinge of the movement in antithrombin resulted in thrombotic disease. Ultimate confirmation of the linked displacement of the target protease by this loop movement was provided in 2000 by the structure of the post-inhibitory complex of alpha1-antitrypsin with trypsin, showing how the displacement results in the deformation and inactivation of the attached protease.
Sources: en.wikipedia.org
In March 2010, the Center for Public Integrity released a report that Bush's administration had made more than 900 false pretenses in a two-year period about the alleged threat of Iraq against the United States, as his rationale to engage in war in Iraq.
Komagataella kurtzmanii G.I.Naumov, E.S.Naumova, Tyurin & Kozlov, 2013 Komagataella mondaviorum G.I.Naumov, E.S.Naumova & K.L.Boundy-Mills, 2018 Komagataella pastoris (Guillierm., 1919) Y.Yamada, M.Matsuda, K.Maeda & Mikata, 1995 Komagataella phaffii Kurtzman, 2005 – responsible for most, if not all, industrial & research use Komagataella populi Kurtzman, 2012 Komagataella pseudopastoris (Dlauchy, Tornai-Leh., Fülöp & G.Péter, 2003) Kurtzman, 2005 Komagataella ulmi Kurtzman, 2012
A summary of the atomic-scale molecular dynamics simulations is then provided which contains important information as follows: 1) a system number that corresponds to a particular phospholipid simulation 2) the concentration of ethanol mol% used in a particular simulation 3) the concentration of ethanol (v/v%) used for the simulation 3) the ethanol/lipid ratio that is derived from the simulation 4) the area (nm2) of the phospholipid membrane which details the expansion of the membranes as the concentration of ethanol is increased 5) the thickness of the membrane which is based on the distance between the average positions of the phosphorus atoms on opposite sides of the phospholipid membrane and 6) the tilt of the head group of the POPC lipid based on changes in the angle towards the interior region of the phospholipid membrane which was surprisingly not very significant.
== Mediated apoptosis == Once inside the target cell, granzyme B can cleave and activate initiator caspases 8 and 10, and executioner caspases 3 and 7 which trigger apoptosis. Caspase 7 is the most sensitive to granzyme B and caspases 3, 8, and 10 are only cleaved to intermediate fragments and need further cleavage for full activation. Granzyme B can also cleave BID leading to BAX/BAK oligomerisation and cytochrome c release from the mitochondria. Granzyme B can cleave ICAD leading to DNA fragmentation and the laddering pattern associated with apoptosis. Granzyme B has a potential of over 300 substrates and can cleave Mcl-1 in the outer mitochondrial membrane relieving its inhibition of Bim. Bim stimulates BAX/BAK oligomerisation, mitochondrial membrane permeability and apoptosis. Granzyme B can also cleave HAX1 (Hs-1 associated protein X-1) to facilitate mitochondria polarisation. Granzyme B can also generate a cytotoxic level of mitochondrial reactive oxygen species (ROS) to mediate cell death. The caspase independent pathways of cell death are thought to have arisen to overcome viruses that can inhibit caspases and prevent apoptosis.
Sources: en.wikipedia.org
No. It is a synthetic analogue modeled on the first 29 residues of human GHRH. The substitutions and any linker are laboratory modifications rather than features of the endogenous peptide.
Early development used the albumin-binding form, and a shorter variant was later discussed under the same label. Because the two differ in half-life and handling, ambiguity arises whenever a source omits the variant designation.
The compound derives from that fragment but is not identical to it. The parent fragment lacks the stabilizing substitutions, so its degradation rate and duration of action differ noticeably.
It binds the growth hormone-releasing hormone receptor on pituitary somatotroph cells. Receptor activation raises cyclic AMP and promotes release of stored growth hormone granules. Because the peptide persists longer than natural releasing hormone, stimulation is prolonged rather than brief.