The short version of CJC-1295 fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-09-02. Anything still debated is marked as such rather than presented as settled.
The two variants differ dramatically in how long they persist in circulation. The form lacking the albumin-binding group has a plasma half-life measured in tens of minutes, comparable to the natural hormone fragment. The version carrying the drug affinity complex binds albumin and shows a half-life of roughly six to eight days in human studies. That figure comes from small trials that tracked hormone levels over extended periods. The physiological consequences of sustained versus pulsatile stimulation are still debated and the literature does not settle the point.
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.
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.
| 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 |
The peptide binds GHRH receptors on somatotroph cells within the anterior pituitary, triggering a signalling cascade that increases growth hormone secretion. Its improved resistance to dipeptidyl peptidase IV degradation distinguishes it from the parent hormone. In the DAC-bearing version, a maleimide group reacts with a cysteine residue on serum albumin, forming a covalent bond that keeps the peptide in circulation far longer. That albumin attachment is the central design feature separating the two research variants.
Pharmacokinetic behaviour differs sharply between the two forms. The DAC-bearing peptide shows an extended circulation time measured in days, whereas the version without the complex is cleared within roughly half an hour. This gap shapes how researchers design dosing schedules in animal models. Whether the prolonged presence of the DAC form produces effects meaningfully different from the short-acting variant remains an open question, since comparative human data are scarce.
Lyophilized material is typically stored at minus twenty degrees Celsius or lower. Keeping the vial dry and protected from light preserves peptide integrity. Repeated freeze-thaw cycles can cause aggregation or loss of activity. Once dissolved, solutions are generally kept at two to eight degrees Celsius. Stability data for reconstituted solutions vary, and long-term behavior is not fully established. Working aliquots reduce the number of times a stock container is opened.
Reverse-phase high-performance liquid chromatography is the standard tool for purity assessment. The technique separates the target peptide from truncated or modified byproducts. Mass spectrometry confirms molecular weight and supports sequence verification. Electrospray ionization and matrix-assisted laser desorption are both used. Amino acid analysis provides an independent check on composition. Purity values are commonly reported as area percentage from the chromatogram. Residual trifluoroacetate and water content are also measured in many quality programs.
Batch-to-batch consistency depends on solid-phase peptide synthesis and subsequent purification. Coupling efficiency, resin choice, and cleavage conditions all affect the final profile. Counter-ion content and moisture can shift the apparent mass of a batch. Documentation typically includes a certificate of analysis with chromatograms and spectra. Independent verification by a second laboratory is sometimes requested. Whether a given certificate reflects the actual vial contents depends on chain of custody. Analytical methods themselves carry uncertainty that should be stated alongside results.
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.
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.
Zinc is an essential trace element for humans and other animals, for plants and for microorganisms. Zinc is required for the function of over 300 enzymes and 1000 transcription factors, and is stored and transferred in metallothioneins. It is the second most abundant trace metal in humans after iron and it is the only metal which appears in all enzyme classes. In proteins, zinc ions are often coordinated to the amino acid side chains of aspartic acid, glutamic acid, cysteine and histidine. The theoretical and computational description of this zinc binding in proteins (as well as that of other transition metals) is difficult. Roughly 2–4 grams of zinc are distributed throughout the human body. Most zinc is in the brain, muscle, bones, kidney, and liver, with the highest concentrations in the prostate and parts of the eye. Semen is particularly rich in zinc, a key factor in prostate gland function and reproductive organ growth. Zinc homeostasis of the body is mainly controlled by the intestine. Here, ZIP4 and especially TRPM7 were linked to intestinal zinc uptake essential for postnatal survival. In humans, the biological roles of zinc are ubiquitous. It interacts with "a wide range of organic ligands", and has roles in the metabolism of RNA and DNA, signal transduction, and gene expression. It also regulates apoptosis. A review from 2015 indicated that about 10% of human proteins (~3000) bind zinc, in addition to hundreds more that transport and traffic zinc; a similar in silico study in the plant Arabidopsis thaliana found 2367 zinc-related proteins.
In about 5–10% of cases, the nodes will calcify circumferentially, producing so-called "eggshell" calcification. This finding, however, is not exclusively diagnostic of silicosis. In some cases, the pulmonary nodules may also become calcified. A computed tomography or CT scan can also provide a mode detailed analysis of the lungs, and can reveal cavitation due to concomitant mycobacterial infection.
Second, "modern awards" are set by the Fair Work Commission. In 2024 there were 150 covering different workplace sectors. These have minimum pay scales depending on employees' experience, qualifications, and skills. For example, the "Legal Services Award 2020" sets minimum weekly rates for "levels 1 to 6" for clerical and administrative staff (but not lawyers), the "Reserve Bank of Australia Award 2016" sets "levels 1 to 5" for annual salaries, and the "Higher Education Industry – Academic Staff – Award 2020" sets a 24 level pay scale with both annual salaries for full-time employees, and comparable minimum hourly rates. These awards are usually far lower than under enterprise bargaining agreements, but are designed to place a minimum floor to prevent unfair competition. The objectives of the FWC under section 134 are improving secure work, gender equality, encouraging bargaining and a competitive economy. Under FWA 2009 section 158 an employer, employee, or trade union covered by the award can apply for a variation of an award. Often, "junior" employees under 21 years old are paid less, and are exempt in this respect from age discrimination laws, based on the theory that it may reduce youth unemployment, even though experience in New Zealand is that paying young people less does not encourage them to find work, and abolishing junior rates had no impact on youth employment.
Sources: en.wikipedia.org
=== Etymology === Phenyl is derived from French phényle, which in turn derived from Greek φαίνω (phaino) 'shining', as the first phenyl compounds named were byproducts of making and refining various gases used for lighting. According to McMurry, "The word is derived from Greek pheno 'I bear light', commemorating the discovery of benzene by Michael Faraday in 1825 from the oily residue left by the illuminating gas used in London street lamps."
=== Dietary measures === One problem with dietary therapy with phosphate—and protein-reduced diets is that they are usually not very palatable. In addition, cats with kidney disease have little appetite and getting used to a new food is made even more difficult due to the negative imprinting (behavior)—the cat associates its own physical discomfort with the new food. The loss of protein via the urine also results in a negative nitrogen balance, which also reduces appetite. Finally, affected animals often show gastrointestinal tract problems. In a clinical study by Elliott et al. 34% of cats could not be switched to the renal diet and in Plantinga et al. the figure was as high as 54%. An attempt can be made to increase the acceptability of the feed by warming it or by adding tasty additives such as tuna juice or sardines. It is therefore recommended to start the feed change only after the uraemia has been eliminated and to extend it over three weeks by gradually mixing it in to avoid feed aversion. Adsorbents such as activated charcoal or probiotics can be used in an attempt to reduce the formation of uraemic substances in the gastrointestinal tract. Cyproheptadine or mirtazapine may be used for a short time to increase appetite; if these measures do not work, force-feeding via an esophageal or gastric tube is necessary.
In addition, although the amide of asparagine is a weak nucleophile, it can serve as an attachment point for glycans. Rarer modifications can occur at oxidized methionines and at some methylene groups in side chains. Post-translational modification of proteins can be experimentally detected by a variety of techniques, including mass spectrometry, Eastern blotting, and Western blotting.
"Our knowledge of the physical and geometrical properties of crystals is now very complete, but their relations to chemical constitution and composition are as yet but little known." After 1912 crystallography would develop dramatically with the widespread adoption of X-ray diffraction to determine crystal structures.
Sources: en.wikipedia.org
The seventh generation Familia (BG) included three-door hatchback, five-door liftback, and four-door saloon variants, none of which share any body panels. The new five-door liftback version was called the Familia Astina in Japan and was sold as the 323F or 323 Astina elsewhere. The BF wagon (originally introduced in 1985) was carried over in facelifted form, although Ford marketed a wagon on the new platform as part of the North American Escort line. The BG Familia was available with front- or all-wheel drive and 1.3–1.8 L petrol engines or a 1.7 L diesel engine. Later, a turbocharged engine was added, especially developed for homologation purposes for the World Rally Championship (WRC), Group A category. The all-wheel drive models (including the turbocharged GT-X) were introduced in August 1989. In Japan, the 1.6 L SOHC was only available coupled to all-wheel drive. With a carburettor, it offered 91 PS (67 kW; 90 hp), the same as the lower-spec 1.5 L SOHC, but with a somewhat larger torque curve. In Europe, only the 1.8 L SOHC (in naturally aspirated, 106 PS (78 kW; 105 hp) form or either of the turbocharged variants) was offered with four-wheel-drive. Trim lines in Japan included "Clair", "Pepper", "Interplay", "Supreme", "GT", "GT-X" and "GT-R". The Supreme model was only available in saloon form and features the larger bumpers and bootlid-mounted number plate recess of the American market Protegé. Carburetted models were mostly dropped in the 1991 facelift, replaced by single-point fuel injection.
== Awards and recognition == 1997: Newcomb Cleveland Prize 1998: W. Alden Spencer Award 1999: Albert Lasker Basic Medical Research Award 2000: Rosenstiel Award 2001: Gairdner Foundation International Award 2003: Louisa Gross Horwitz Prize 2003: Nobel Prize in Chemistry
9.6 Ca(NO3)2 + 6 (NH4)2HPO4 → Ca9.6(PO4)5.6(HPO4)0.4(OH)1.6 Sintering these non-stoichiometric phases forms a solid phase which is an intimate mixture of tricalcium phosphate and hydroxyapatite, termed biphasic calcium phosphate:
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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.
It is a synthetic peptide analogue of growth hormone-releasing hormone. Four substitutions in its sequence make it more resistant to enzymatic degradation than the natural hormone. In the version carrying a drug affinity complex, the peptide binds albumin and remains in circulation for days.