A practical reference on CJC-1295: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-05-22 and is reviewed periodically as new material appears.
Lyophilized peptide powder is comparatively stable when kept dry, cold, and protected from light. Once dissolved, the molecule is vulnerable to deamidation, oxidation, and aggregation, with the rate depending on pH, buffer composition, and temperature. Alkaline conditions and repeated freeze-thaw cycles accelerate loss of the intact peptide. The methionine present in the native sequence is a known oxidation site, which is one reason it was replaced in the modified fragment. Suppliers typically recommend cold storage of solutions and use within a short window.
Analytical confirmation usually relies on reversed-phase high-performance liquid chromatography for purity and on liquid chromatography coupled to mass spectrometry for identity. Mass data reveal the expected molecular mass and can flag truncated or oxidized species. Amino acid analysis and peptide mapping provide sequence-level verification. Immunoassays are used in some biological matrices, but antibodies raised against one releasing-hormone analog may cross-react with another. Reported purity figures depend heavily on the method used, so comparisons between suppliers require matching the analytical approach.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular mass | Approximately 3.4 to 3.6 kDa | Depends on whether the affinity complex is attached |
| Appearance | White to off-white lyophilized powder | Freeze-dried solid, often in a sealed vial |
| Solubility | Soluble in water and aqueous buffers | Dissolution rate varies with pH and buffer salt |
| Typical storage | Below minus 20 degrees Celsius, dry and dark | Dissolved material is usually kept cold and used promptly |
| Common analytical methods | Reversed-phase HPLC and mass spectrometry | Peptide mapping and amino acid analysis add sequence detail |
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 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.
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.
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.
Starmer says he has taken account of whether it would be right "to impose a further burden on the taxpayer". MSPs vote unanimously in favour of plans to ban dual mandates. Following an external review into the use of messaging services, Scotland's Deputy First Minister, Kate Forbes announces that Scottish Government ministers and staff will be banned from using WhatsApp for official business. Former First Minister of Scotland Humza Yousaf announces he will step down as an MSP at the 2026 Scottish Parliament election. Democracy and Boundary Commission Cymru unveils the names of the 16 constituencies that will make up the enlarged Senedd from 2026, with all but four of them known by exclusively Welsh language names. The Welsh Conservatives reaffirm their commitment to devolution following a social media post by MS Joel James, who said he wanted to get "rid" of the Senedd; the post, in response to the announcement of the constituencies for the 2026 election, was swiftly deleted. Nigel Farage says that Reform UK are in "open negotiations" with US billionaire Elon Musk about him donating to the party after the pair met at Donald Trump's Mar-a-Lago estate in Florida. 18 December – Reform UK confirms that Craig Campbell, a party official in Scotland, has been removed from his post after revelations his family has links to Ulster Loyalists and has a relatives who was convicted of murdering a Celtic fan. Police are called to what is described as a heated meeting of Oldham Council.
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== External links == Apelin+protein,+human at the U.S. National Library of Medicine Medical Subject Headings (MeSH) "Apelin". IUPHAR Database of Receptors and Ion Channels. International Union of Basic and Clinical Pharmacology. Archived from the original on 2021-08-16. Retrieved 2007-10-25. Human APLN genome location and APLN gene details page in the UCSC Genome Browser.
The statue's iconography is frequently compared to that of the carmen saeculare by Horace, and commemorates Augustus's establishment of the Pax Romana. The breastplate is carved in relief with numerous small figures depicting the return, thanks to the diplomacy of Augustus, of the Roman legionary eagles or aquilae lost to Parthia by Mark Antony in the 40s BC and by Crassus in 53 BC. The figure in the centre, according to the most common interpretation, is the subjected Parthian king (Phraates IV) returning Crassus's standard to an armored Roman (possibly Tiberius, or symbolically Mars Ultor or the incarnation of the ideal legionary). Another theory sees in the male figure the ideal incarnation of the Roman legions. This was a very popular subject in Augustan propaganda, as one of his greatest international successes, and had to be especially strongly emphasized, since Augustus had been deterred by Parthian military strength from the war which the Roman people had expected and had instead opted for diplomacy. Below the armed figure we can see a dog, or probably a wolf or, according to archaeologist Ascanio Modena Altieri, a she-wolf, nurse of Romulus and Remus. To the left and right sit mourning female figures; the figure on the one side with a sheathed sword personifies the peoples in the East (and possibly the Teutons) forced to pay tribute to Rome, and the one on the other side with an unsheathed sword personifies the subjected peoples (the Celts). From the top, clockwise, we see:
Sources: en.wikipedia.org
==== Fuel cells ==== Appropriately perforated graphene (and hexagonal boron nitride hBN) can allow protons to pass through it, offering the potential for using graphene monolayers as a barrier that blocks hydrogen atoms but not protons/ionized hydrogen (hydrogen atoms with their electrons stripped off). They could even be used to extract hydrogen gas out of the atmosphere that could power electric generators with ambient air. The membranes are more effective at elevated temperatures and when covered with catalytic nanoparticles such as platinum. Graphene could solve a major problem for fuel cells: fuel crossover that reduces efficiency and durability. In methanol fuel cells, graphene used as a barrier layer in the membrane area, has reduced fuel cross over with negligible proton resistance, improving the performance. At room temperature, proton conductivity with monolayer hBN, outperforms graphene, with resistivity to proton flow of about 10 Ω cm2 and a low activation energy of about 0.3 electronvolts. At higher temperatures, graphene outperforms with resistivity estimated to fall below 10−3 Ω cm2 above 250 degrees Celsius. In another project, protons easily pass through slightly imperfect graphene membranes on fused silica in water. The membrane was exposed to cycles of high and low pH. Protons transferred reversibly from the aqueous phase through the graphene to the other side where they undergo acid–base chemistry with silica hydroxyl groups.
However, this cannot be seen in experiments and the model has been widely rejected. The most accepted view is that the TCR engages in kinetic proofreading. The kinetic proofreading model proposes that a signal is not directly produced upon binding but a series of intermediate steps ensure a time delay between binding and signal output. Such intermediate "proofreading" steps can be multiple rounds of tyrosine phosphorylation. These steps require energy and therefore do not happen spontaneously, only when the receptor is bound to its ligand. This way only ligands with high affinity that bind the TCR for a long enough time can initiate a signal. All intermediate steps are reversible, such that upon ligand dissociation the receptor reverts to its original unphosphorylated state before a new ligand binds. This model predicts that maximum response of T cells decreases for pMHC with shorter lifetime. Experiments have confirmed this model. However, the basic kinetic proofreading model has a trade-off between sensitivity and specificity. Increasing the number of proofreading steps increases the specificity but lowers the sensitivity of the receptor. The model is therefore not sufficient to explain the high sensitivity and specificity of TCRs that have been observed. (Altan Bonnet2005) Multiple models that extend the kinetic proofreading model have been proposed, but evidence for the models is still controversial. The antigen sensitivity is higher in antigen-experienced T cells than in naive T cells.
Although some medical authorities recommend mirroring the terminology transgender people use to describe their own genitals, such usage may feel uncomfortable and intimate to some transgender people, who prefer to use different terms in medical contexts than they would in personal settings. At the same time, patients may also be uncomfortable with anatomical terms they perceive as gendered. Specialists recommend being open to using sex-neutral terms for organs, such as external genitals or lateral folds for the labia, internal reproductive organs for the uterus and ovaries, and chest for the breasts. Style guides such as the Publication Manual of the American Psychological Association and AMA Manual of Style recommend using gender-neutral language and distinguishing between gender and biological sex, but do not give guidance on specific anatomical terminology.
Obesity is typically defined as a substantial accumulation of body fat that could impact health. Medical organizations tend to classify people living with obesity based on body mass index (BMI) – a ratio of a person's weight in kilograms to the square of their height in meters. For adults, the World Health Organization (WHO) defines "overweight" as a BMI 25 or higher, and "obesity" as a BMI 30 or higher. The U.S. Centers for Disease Control and Prevention (CDC) further subdivides obesity based on BMI, with a BMI 30 to 35 called class 1 obesity; 35 to 40, class 2 obesity; and 40+, class 3 obesity. For children, obesity measures take age into consideration along with height and weight. For children aged 5–19, the WHO defines obesity as a BMI two standard deviations above the median for their age (a BMI around 18 for a five-year old; around 30 for a 19-year old). For children under five, the WHO defines obesity as a weight three standard deviations above the median for their height. Some modifications to the WHO definitions have been made by particular organizations. The surgical literature breaks down class II and III or only class III obesity into further categories whose exact values are still disputed.
By June 2009, Roche discontinued the Accutane brand amid falling market share and rising costs from personal injury lawsuits. However, Roche's overseas affiliates continue to sell isotretinoin as Roaccutane. In 2011, actor James Marshall sued Roche, alleging that Accutane had caused injuries requiring removal of his colon, but the jury denied his claim based on Marshall's pre-existing bowel disease.
Sources: en.wikipedia.org
The version carrying the affinity complex bears a maleimide group that binds serum albumin, which extends its circulation time to several days. The version without it lacks this group and clears within roughly half an hour. The two are chemically related but behave very differently once in the body.
In common usage the name without the affinity complex is often equated with MOD GRF 1-29, a fragment carrying four stabilizing substitutions. Strictly speaking, the term originally referred to the albumin-binding version. The overlap in naming causes frequent ambiguity in both informal and technical writing.
Reversed-phase chromatography separates the peptide from related impurities and yields a purity estimate. Mass spectrometry confirms the molecular mass and detects modifications such as oxidation. Sequence-level checks rely on peptide mapping or amino acid analysis when stronger confirmation is needed.
Reported values cluster in the range of several days, reflecting slow release from the albumin complex. Estimates differ across species and assay platforms. The figure describes circulation time in study settings rather than a fixed property.