This is a working overview of cjc-1295, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-08-01. Anything still debated is marked as such rather than presented as settled.
Four amino acid substitutions separate the modified backbone from the parent GRF(1-29) sequence. These changes reduce recognition by dipeptidyl peptidase IV and related proteases, extending the interval before degradation. Development work in this area sought longer-acting GHRH analogs for endocrine investigation. Published descriptions treat the substitution set as a defining property of the core sequence, while the albumin-binding linker is described separately as an optional addition to that same backbone.
CJC-1295 is a synthetic peptide analog of growth hormone-releasing hormone, constructed on the 29-amino-acid fragment designated GRF(1-29). The name began as an internal development code during the 1990s and later spread through research supply catalogs and discussion forums. The molecule does not occur in nature; its sequence is engineered rather than isolated from tissue. Two related compounds are sold under this single label, and they differ by one appended chemical group that strongly influences how long the peptide remains in circulation.
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 |
|---|---|---|
| Molecular class | Synthetic peptide | Analog of growth hormone-releasing hormone |
| Chain length | 29 amino acids | Based on the GRF(1-29) fragment |
| Appearance | White to off-white lyophilized powder | Common research supply form |
| Solubility | Soluble in water and aqueous buffers | Powder requires reconstitution before use |
| Typical storage | −20 °C or below | Kept away from light and moisture |
CJC-1295 is a synthetic peptide built as a long-acting analogue of growth hormone-releasing hormone. Its backbone matches the first twenty-nine residues of the natural human hormone, with four amino acid substitutions added to slow enzymatic breakdown. A reactive maleimide group, commonly termed the drug affinity complex, allows the peptide to attach to circulating albumin after administration. That albumin attachment keeps the molecule in the bloodstream for an extended period instead of being cleared within minutes.
The compound emerged from work at a Canadian biotechnology firm in the early 2000s. Early human studies examined its effect on growth hormone and insulin-like growth factor 1 in healthy volunteers and in people with HIV-associated fat redistribution. Reports described sustained increases in both markers after a single injection. Development did not advance to regulatory approval, and the clinical programme was later discontinued. The molecule is now encountered mainly as a research chemical rather than a marketed medicine.
The second form adds a maleimide-bearing linker to the lysine at the carboxyl end. This group reacts with cysteine-34 on circulating serum albumin, forming a covalent bond that keeps the peptide in the bloodstream for far longer. ConjuChem developed the molecule as a way to extend the action of a peptide without frequent administration. The albumin attachment is the defining structural feature of the drug affinity complex version. Whether continuous exposure produces effects distinct from shorter pulses remains an unresolved research question.
CJC-1295 belongs to a family of synthetic peptides modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. The compound is built from the first twenty-nine amino acids of the natural human sequence, a fragment that retains full receptor binding capacity. Native growth hormone-releasing hormone is degraded quickly in circulation, so the fragment alone has limited practical value. Early work therefore focused on chemical modifications that preserve receptor binding while slowing enzymatic breakdown. The result is a molecule described in the literature as a long-acting analog of the natural hormone.
Characterization of this peptide relies on a small set of routine techniques. Reversed-phase high-performance liquid chromatography separates the target from truncated or oxidized by-products and yields a purity estimate when paired with ultraviolet detection near 214 nanometers. Mass spectrometry, either electrospray coupled to liquid chromatography or matrix-assisted laser desorption, confirms that the observed mass matches the value calculated for the expected sequence. Amino acid analysis, and enzymatic digestion followed by fragment mapping, are used when the sequence itself rather than the mass requires verification.
Stability depends heavily on physical state. A lyophilized powder kept dry, desiccated, and shielded from light typically holds its integrity for months to years at minus twenty degrees Celsius, and longer at minus eighty. Once dissolved, the peptide becomes far more vulnerable, since peptide bond hydrolysis, oxidation of susceptible residues, and aggregation all proceed faster in solution. Buffers near neutral pH are generally gentler than strongly acidic or alkaline conditions. Repeated freeze-thaw cycles and exposure to air-liquid interfaces during vigorous mixing cause losses that are easy to overlook.
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.
== Structure == Bilirubin consists of an open-chain tetrapyrrole. It is formed by oxidative cleavage of a porphyrin in heme, which affords biliverdin. Biliverdin is reduced to bilirubin. After conjugation with glucuronic acid, bilirubin is water-soluble and can be excreted. Bilirubin is structurally similar to the pigment phycobilin used by certain algae to capture light energy, and to the pigment phytochrome used by plants to sense light. All of these contain an open chain of four pyrrolic rings. Like these other pigments, some of the double-bonds in bilirubin isomerize when exposed to light. This isomerization is relevant to the phototherapy of jaundiced newborns: the E,Z-isomers of bilirubin formed upon light exposure are more soluble than the unilluminated Z,Z-isomer, as the possibility of intramolecular hydrogen bonding is removed. Increased solubility allows the excretion of unconjugated bilirubin in bile. Some textbooks and research articles show the incorrect geometric isomer of bilirubin. The naturally occurring isomer is the Z,Z-isomer.
In the same paper, LY-2456302 (now CERC-501) was described, "The LY2456302 compound developed by Eli Lilly is an example of a KOR antagonist that does not strongly activate JNK. In a recent phase 1 trial of LY2456302, the authors concluded that the drug was well-tolerated with no clinically significant findings (Lowe et al, 2014)." Note that KOR antagonists that strongly activate JNK are inactivating (long-acting) while those that do not are non-inactivating (short-acting), and that inactivating KOR antagonists are more "complete" and hence potentially more risky inhibitors of the KOR than are non-inactivating antagonists.
In 2018, McGregor starred as the adult version of the titular character in Christopher Robin, a live-action adaptation of Disney's Winnie the Pooh franchise directed by Marc Forster and starred alongside Hayley Atwell. In 2019, McGregor starred as the older Danny Torrance in Doctor Sleep, the film adaptation of Stephen King's novel of the same name. In 2020, he appeared opposite Margot Robbie in Warner Bros.' DC Comics film Birds of Prey (and the Fantabulous Emancipation of One Harley Quinn), directed by Cathy Yan, as the main villain Roman Sionis / Black Mask. On 23 August 2019, Lucasfilm announced that McGregor would reprise his role as Obi-Wan Kenobi in a new Star Wars television series, which was released on Disney+ in 2022. In 2021, McGregor played the American fashion designer Halston in the eponymously titled miniseries for Netflix, based on the candid biography Simply Halston by journalist Steven Gaines. McGregor was also billed as executive producer, jointly with Ryan Murphy. In 2022, McGregor voiced Sebastián J. Cricket, the conscience and narrator, in Pinocchio. The film was directed by Guillermo del Toro and premiered on Netflix. In September 2024, McGregor received his star on the Hollywood Walk of Fame. In 2026, he had a starring role as Greg Platt in the science fiction survival film The End of Oak Street.
=== Dry instant soups === Sometimes ingredients used in dry instant soups are ground into fragments, which enables them to be dissolved when water is added. These particulates are sometimes prepared using freeze-drying and puff drying. Freeze-drying is a recent dehydration breakthrough method that is restricted to high-value foods due to the high cost associated with the process. Despite its cost, freeze-drying is very effective in retaining the overall quality and nutritional value of the food through a process called sublimation, where water is removed (evaporated) from food in its frozen state without the transition through the liquid state. Removing water from food prevents spoilage as it does not give an environment that favors the growth of spoilage-causing microorganisms such as bacteria, mould, and yeast. Freeze-drying also reduces the total weight of the food, especially fruit and vegetables that are mostly water, thus making the transportation of these products more efficient. Vegetables used in instant soup mixes often undergo freeze-drying which helps them retain their nutritional value, texture, and flavor. Furthermore, as the food remains rigid during dehydration, subliming water creates holes where the evaporated ice crystals used to be. This allows freeze-dried foods such as vegetables to retain their shape without shrinkage, and these foods rehydrate completely when water is added to the mix that fills the voids left by the subliming water.
Sources: en.wikipedia.org
Indoor air quality can be addressed, achieved or maintained during the design of new buildings or as mitigating measures in existing buildings. A hierarchy of measures has been proposed by the Institute of Air Quality Management. It emphasizes removing pollutant sources, reducing emissions from any remaining sources, disrupting pathways between sources and the people exposed, protecting people from exposure to pollutants, and removing people from areas with poor air quality. A report assisted by the Institute for Occupational Safety and Health of the German Social Accident Insurance can support in the systematic investigation of individual health problems arising at indoor workplaces, and in the identification of practical solutions.
=== Activation of emitters === The growth process of microneedles on emitters is termed ‘activation’. The tips of microneedles can provide high field strength for field desorption, and higher emission current can be obtained due to the increased emission area compared to metal tips. Some activation methods include high-temperature (HT) activation, high-rate (HR) activation, and electrochemical desorption. In the HT activation mode, a 10 μm tungsten wire is activated outside the mass spectrometer in a vacuum cell containing benzonitrile at a pressure of about 10−1 Pa. The tungsten wire serving as the field anode is then heated up to about 1500 K with direct current at a potential of about 10 kV with respect to a cathode. Carbon microneedles can be produced within 8-12 h. HR activation method is to reverse the polarity of the emitter and the counter electrode, which emits a strong electron current. The strong electron current results in the heating of the growing carbon needles and therefore the high rates of the needle growth. In the HR activation mode, needles of other metals (iron, nickel or cobalt) and of alloys can also be generated. Instead of carbon microneedles, metallic dendrites (mainly of nickel or cobalt) can be produced on thin wires through electrochemical desorption process. This method is even faster than HR method.
Wolpaw and Pinkerton turned down invitations to return to Valve early in the Alyx development. Instead, Valve recruited Rob Yescombe of The Invisible Hours, who worked on Alyx in 2017 and 2018. Yescombe's narrative was darker than previous Half-Life games, with scenes of dread, torture and horror. The antagonist was a female Combine officer named Hahn; in one proposed ending, Alyx would kill Hahn in revenge for torturing her father. Yescombe also proposed an ending in which Alyx and the G-Man would travel back in time to the events of the first Half-Life to prevent Freeman from triggering the alien invasion. After the company-wide playtest in 2018, feedback was overwhelmingly positive save for the story, which employees scored the lowest of any Valve game. Morasky described it as "dark, serious and laborious", likening it to a Zack Snyder superhero film. The designer Corey Peters said the feedback vindicated their misgivings. Valve initially planned to launch Alyx alongside its Index VR headset in June 2019, but delayed it to address the story. They re-enlisted Wolpaw and Pinkerton to rewrite the plot and dialogue while preserving the gameplay, along with Jake Rodkin and Sean Vanaman, who had joined when Valve acquired Campo Santo. Laidlaw, who retired in 2016, denied reports that he had provided consultation, saying he had confidence in Pinkerton and Wolpaw and that he did not want them "second-guessing" him. The new writing team identified three problems. First, the nature of a prequel meant that players knew the characters would survive, reducing suspense.
Sources: en.wikipedia.org
No. It is a laboratory-synthesized analog built on a fragment of the natural hormone. The natural peptide is shorter-lived and lacks the stabilizing substitutions found in the synthetic version.
DAC stands for drug affinity complex, a chemical group that binds the peptide to serum albumin. The binding slows clearance and lengthens the time the molecule stays in plasma compared with the unmodified analog.
Because two distinct molecules are discussed under one informal label. The albumin-binding version clears over several days, while the form without that group clears within roughly half an hour. Mixing results from both creates inconsistent figures.
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.