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 2025-08-23. Anything still debated is marked as such rather than presented as settled.
Lyophilized material is generally stable for extended periods when held at minus twenty degrees Celsius or below and protected from moisture and light. In solution the peptide is more labile; bond hydrolysis, aggregation and oxidation of susceptible residues all proceed faster at ambient temperature. Repeated freeze and thaw cycles should be avoided because they promote clumping and loss of soluble material. The conjugated variant adds a further consideration, since the maleimide group can hydrolyze in aqueous buffer and lose its ability to react with albumin.
Laboratory handling centers on minimizing exposure to water, heat and oxygen before use. Working solutions are typically prepared in sterile water or a mild buffer, and any residual particulate matter is removed by filtration. When the powder dissolves slowly, a small proportion of acetonitrile or dilute acetic acid is sometimes added as a co-solvent. Containers are kept sealed and desiccated between uses. Records of lot number, reconstitution date and storage conditions support later comparison of results across experiments.
The distinguishing feature of the DAC form is a maleimide-containing group that reacts with the free thiol of cysteine-34 on human serum albumin. This reaction forms a covalent bond without enzymatic assistance, and it takes place after the peptide enters the bloodstream. Because albumin is abundant and long-lived, the attached peptide is carried through circulation far longer than an unmodified fragment would survive. The chemistry is a deliberate pharmacokinetic strategy rather than a change to receptor activity.
Enzymatic protection is a separate mechanism from plasma protein binding. The four substitutions in the backbone reduce recognition by dipeptidyl peptidase IV, which normally cleaves the natural hormone within minutes. Without the reactive group, this resistance still yields only a short window of activity, generally reported in the range of tens of minutes. With it, reported half-lives in early human work extended to several days. The size of that gap is the main practical distinction between the two materials.
Both forms act at the pituitary receptor for growth hormone-releasing hormone and increase growth hormone output, which in turn raises insulin-like growth factor 1. A long-acting analog produces sustained rather than pulsatile stimulation, and the physiological consequences of that pattern are not fully settled. Published human data on the extended form remain limited, and much of what circulates in discussion traces to early company reports rather than independent replication. How sustained exposure affects normal feedback remains an open question.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off white powder | Typical lyophilized form |
| Water solubility | Soluble | May need a small organic co-solvent |
| Purity assessment | Chromatographic peak area | Most certificates report a percentage figure |
| Storage temperature | Minus 20 C or lower | Dry, dark, sealed container |
| Identity check | Electrospray mass spectrometry | Compared against theoretical mass |
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.
Two forms circulate in research settings and are frequently confused. One carries the drug affinity complex and is often written as CJC-1295 with DAC; the other lacks that group and is usually called modified GRF(1-29). The two share the same core sequence but differ sharply in how long they persist in blood. Products labelled only as CJC-1295 normally refer to the version carrying the complex. Documentation that omits the distinction leaves the intended molecule ambiguous.
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.
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.
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.
Based on preliminary clinical studies, vortioxetine may cause less emotional blunting than SSRIs and SNRIs. Vortioxetine used in combination with other serotonergic drugs such as MAOIs or SSRIs may result in serotonin syndrome.
=== Gross composition === Published data on donkey milk's gross composition confirm the close resemblance to breast milk for lactose, protein, and ash levels when compared with cow, sheep and goat milk. Despite the high lactose content of donkey milk, the average fat content is lower. When used in infant nutrition, donkey milk is usually supplemented with vegetable oil (4 mL per 100 mL of milk) to conform to human milk energy.
=== Malaysian and Singaporean === Malays from Malaysia, using the Malay dialect similar to Indonesian, use the word kicap for soy sauce. Kicap is traditionally of two types: kicap lemak (lit "fat/rich soy sauce") and kicap cair. Kicap lemak is similar to Indonesian kecap manis but with very much less sugar, while kicap cair is the Malaysian equivalent of kecap asin.
Sources: en.wikipedia.org
=== Mechanism of action === Pazopanib is a multiple kinase inhibitor that limits tumor growth by targeting angiogenesis via inhibition of enzymes including vascular endothelial growth factor receptor (VEGFR), platelet-derived growth factor receptor (PDGFR), c-KIT and FGFR.
The formation of such a heterochromatin region, though not its maintenance, is Dicer-dependent, presumably because Dicer is required to generate the initial complement of siRNAs that target subsequent transcripts. Heterochromatin maintenance has been suggested to function as a self-reinforcing feedback loop, as new siRNAs are formed from the occasional nascent transcripts by RdRP for incorporation into local RITS complexes. The relevance of observations from fission yeast mating-type regions and centromeres to mammals is not clear, as heterochromatin maintenance in mammalian cells may be independent of the components of the RNAi pathway.
== Clinical significance == Increasing evidence links aberrant CL metabolism and content to human disease. Human conditions include neurological disorders, cancer, and cardiovascular and metabolic disorders (a full list can be found at). As the number of human diseases with CL profile abnormalities has exponentially grown, the use of qualitative and quantitative diagnostics has emerged as a necessity.
=== Indonesian pork incident === In early 2001, Ajinomoto was involved in an incident in Indonesia, a predominantly Muslim country, when it was revealed that a pork-based enzyme had been used in its MSG production. According to Islamic dietary laws, pork is a haram (forbidden) meat, and is regarded as unclean. Immediately after the incident, the Food and Drug Administration of the Indonesian government stepped up to announce that Ajinomoto's end product did not contain pig-derived substances. Additionally, Ajinomoto also announced that its products were derived from soybeans.
Sources: en.wikipedia.org
However, after identification of the corresponding active gene clusters, these genes can be cloned into yeast and expressed as well to produce the product of interest in a more cost and time effective way. This method can also be used to discover new drugs. In this experiment, previously unstudied fungal genetic sequences can be characterized and expressed, which allows the production of new natural products. However, with mutagenesis of genes towards a more biologically relevant compound, this can then be expressed to yield a new genetically modified product. Another important use of heterologous expression is to screen different drugs in a host system rather than a more expensive or difficult to sustain native system. An example of this would be using Mycobacterium marinum as an alternative host system compared to directly using Mycobacterium tuberculosis. M. tuberculosis requires high biosafety level facilities for drug screening and has a slow growth rate which makes the process expensive and time-consuming. Therefore, researchers tested a closely related and less hazardous M. marinum, which heterologous expression of two drug activators, became an accurate model to test tuberculosis drugs in. An example examining a more focused drug target is the heterologous expression of ion channel proteins to test different cardiac ion channel drugs that alter their function to address heart disease. Similarly, drug screening can occur with heterologous expression of cloned receptors.
==== Dentine sensitivity ==== Nano-hydroxyapatite possesses bioactive components which can prompt the mineralisation process of teeth, remedying hypersensitivity. Hypersensitivity of teeth is thought to be regulated by fluid within dentinal tubules. The movement of this fluid as a result of different stimuli is said to excite receptor cells in the pulp and trigger sensations of pain. The physical properties of the nano-hydroxyapatite can penetrate and seal the tubules, stopping the circulation of the fluid and therefore the sensations of pain from stimuli. Nano-hydroxyapatite would be preferred as it parallels the natural process of surface remineralisation. In comparison to alternative treatments for dentine hypersensitivity relief, nano-hydroxyapatite containing treatment has been shown to perform better clinically. Nano-hydroxyapatite was proven to be better than other treatments at reducing sensitivity against evaporative stimuli, such as an air blast, and tactile stimuli, such as tapping the tooth with a dental instrument. However, no difference was seen between nano-hydroxyapatite and other treatments for cold stimuli. Hydroxylapatite has shown significant medium and long-term desensitizing effects on dentine hypersensitivity using evaporative stimuli and the visual analogue scale (alongside potassium nitrate, arginine, glutaraldehyde with hydroxyethyl methacrylate, hydroxyapatite, adhesive systems, glass ionomer cements and laser).
=== New York === In January 2023, the New York City Bias Audit Law (Local Law 144) was enacted by the NYC Council in November 2021. Originally due to come into effect on 1 January 2023, the enforcement date for Local Law 144 has been pushed back due to the high volume of comments received during the public hearing on the Department of Consumer and Worker Protection's (DCWP) proposed rules to clarify the requirements of the legislation. It eventually became effective on July 5, 2023. From this date, the companies that are operating and hiring in New York City are prohibited from using automated tools to hire candidates or promote employees, unless the tools have been independently audited for bias. The Responsible AI Safety and Education Act (RAISE Act) is a New York State law that imposes transparency, safety, and reporting requirements on developers of large frontier artificial intelligence models. The law was signed by Governor Kathy Hochul on December 19, 2025. It is expected to take effect on January 1, 2027.
== See also == Anatomical pathology – Medical specialty Blood test – Laboratory analysis performed on a blood sample Clinical Laboratory Improvement Amendments – United States federal regulatory standards Diagnostics – Identification of the nature and cause of a certain phenomenonPages displaying short descriptions of redirect targets Healthcare – Prevention of disease and promotion of well-beingPages displaying short descriptions of redirect targets Histology – Study of the microscopic anatomy of cells and tissues of plants and animals Laboratory stewardship – Optimizing use of laboratory tests Pathology – Study of disease Point-of-care testing – Diagnostic testing performed at or near the point of care Associations American Society for Clinical Pathology – Medical association Association for Diagnostics & Laboratory Medicine – Global scientific society Journals Laboratory medicine journals
=== Detection in body fluids === Buprenorphine and norbuprenorphine may be quantified in blood or urine to monitor use or non-medical recreational use, confirm a diagnosis of poisoning, or assist in a medicolegal investigation. A significant overlap of drug concentrations exists in body fluids within the possible spectrum of physiological reactions ranging from asymptomatic to comatose. Therefore, knowing both the route of administration of the drug and the level of tolerance to opioids of the individual is critical when results are interpreted.
Sources: en.wikipedia.org
The mass difference from the linker is large enough for routine detection by mass spectrometry. The unconjugated form gives a single sharp signal at its expected weight. Material that has already reacted with albumin shows a much higher mass and a broadened chromatographic peak.
Yes. Degradation proceeds faster once the powder is dissolved, especially at room temperature or after multiple freeze and thaw cycles. Working solutions are often aliquoted to avoid repeated handling. Lyophilized powder held cold and dry retains its properties far longer.
Truncated sequences, oxidized residues and aggregated forms can all elute near the main peak. Reversed phase chromatography resolves many of these species, so the number of peaks is a useful indicator of synthesis quality. A single peak does not by itself prove correct sequence, which is why mass confirmation is paired with it.
A maleimide moiety reacts with the thiol of cysteine-34, forming a covalent bond. The reaction occurs in circulation without enzymatic catalysis.