GHRH analogue comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2026-01-28. Where a claim depends on a specific study, the study is described rather than over-claimed.
Two related forms circulate in technical discussion under the same family name. The original version carries a drug affinity complex (DAC) that binds covalently to serum albumin after administration, and this linkage substantially extends circulation time. A second form, frequently written as modified GRF(1-29) or CJC-1295 without DAC, lacks that linker and clears much faster. The naming is a frequent source of confusion because the shorthand CJC-1295 can refer to either form depending on the source. Reports sometimes fail to specify which variant was studied.
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.
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 forms circulate under the CJC-1295 name, and they differ by a single appended group. The version without a drug affinity complex carries four substitutions along the peptide chain, including a D-alanine near the amino terminus and replacements at three other positions. These changes block the enzyme dipeptidyl peptidase IV and remove a methionine residue that is prone to oxidation. The modified fragment is frequently labeled MOD GRF 1-29. Naming conventions are inconsistent across informal sources, which is a common source of confusion.
| 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 |
The albumin-binding version stays in circulation for days, because covalent attachment to serum albumin shields the peptide from rapid filtration and degradation. Reported half-lives for this form fall in the range of several days. The version without the linker is cleared in minutes, with estimates often near thirty minutes in animal work. These figures come from small studies and vary with assay method, species, and route, so they are best read as approximate rather than fixed constants.
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.
Reports on this compound commonly follow serum growth hormone and insulin-like growth factor 1 across defined time windows. Protocols differ in sampling frequency, assay platform, and participant characteristics, which makes direct comparison between publications difficult. Some work focuses on pulsatile release patterns instead of average concentrations. Whether repeated exposure alters endogenous hormone rhythms over long periods remains an open question, and the formal literature is thinner than the volume of informal commentary implies.
Once in circulation, the peptide binds the growth hormone-releasing hormone receptor displayed on pituitary somatotroph cells. Receptor activation couples to Gs proteins, elevates intracellular cyclic AMP, and drives protein kinase A signaling inside the cell. That cascade increases discharge of growth hormone into the bloodstream. The analog therefore operates through a receptor pathway that already exists for the body's own releasing hormone, rather than through an engineered artificial target.
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.
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.
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.
Lichens are defined by the International Association for Lichenology to be "an association of a fungus and a photosynthetic symbiont resulting in a stable vegetative body having a specific structure". The fungi, or mycobionts, are mainly from the Ascomycota with a few from the Basidiomycota. In nature, they do not occur separate from lichens. It is unknown when they began to associate. One or more mycobiont associates with the same phycobiont species, from the green algae, except that alternatively, the mycobiont may associate with a species of cyanobacteria (hence "photobiont" is the more accurate term). A photobiont may be associated with many different mycobionts or may live independently; accordingly, lichens are named and classified as fungal species. The association is termed a morphogenesis because the lichen has a form and capabilities not possessed by the symbiont species alone (they can be experimentally isolated). The photobiont possibly triggers otherwise latent genes in the mycobiont. Trentepohlia is an example of a common green alga genus worldwide that can grow on its own or be lichenised. Lichen thus share some of the habitat and often similar appearance with specialized species of algae (aerophytes) growing on exposed surfaces such as tree trunks and rocks and sometimes discoloring them.
The urine test may be a chromatographic immunoassay or any of several other test formats, home-, physician's office-, or laboratory-based. Published detection thresholds range from 20 to 100 mIU/mL, depending on the brand of test. Early in pregnancy, more accurate results may be obtained by using the first urine of the morning (when urine is most concentrated). When the urine is dilute (specific gravity less than 1.015), the hCG concentration may not be representative of the blood concentration, and the test may be falsely negative. The serum test, using 2-4 mL of venous blood, is typically a chemiluminescent or fluorimetric immunoassay that can detect βhCG levels as low as 5 mIU/mL and allows quantification of the βhCG concentration.
== Cost == Prices of prescription drugs vary widely around the world. Prescription costs for biosimilar and generic drugs are usually less than brand names, but the cost is different from one pharmacy to another. To lower prescription drug costs, some U.S. states have sought federal approval to buy drugs in Canada, as of 2022. Generics undergo strict scrutiny to meet the equal efficacy, safety, dosage, strength, stability, and quality of brand name drugs. Generics are developed after the brand name has already been established, and so generic drug approval in many aspects has a shortened approval process because it replicates the brand name drug. Brand name drugs cost more due to time, money, and resources that drug companies invest in them to conduct development, including clinical trials that the FDA requires for the drug to be marketed. Because drug companies have to invest more in research costs to do this, brand name drug prices are much higher when sold to consumers. When the patent expires for a brand name drug, generic versions of that drug are produced by other companies and are sold for lower price. By switching to generic prescription drugs, patients can save significant amounts of money: e.g. one study by the FDA showed an example with more than 52% savings of a consumer's overall costs of their prescription drugs.
== Limitations == Different energies in the ion source can cause variations in negative ion formation and make the mass spectra difficult to duplicate. Results shown in the mass spectrum can vary from instrument to instrument. The temperature of the ion source needs to be monitored. An increase in fragment ions occurs at higher temperatures. Lower temperatures will lower the energy of electrons. Set temperatures can vary, but it is important for electron energy to approach thermal levels for resonance electron capture to occur. Pressure of the added enhancement gas needs to be determined. Increasing the pressure will help stabilize the anions and extend the lifetimes of the negative ions. If the pressure is too high, not as many ions can exit the ion source. Analysis should be done using low sample loads for GC-EC-MS. The amount of sample will affect the ion abundance and cause variations in data.
== Chemistry == In terms of chemical structure, RO5203648 is a 2-aminooxazoline derivative. This group also includes a number of other selective TAAR1 ligands, including the near-full agonist RO5166017, the full agonist RO5256390, and the partial agonist RO5263397. RO5203648 is also very closely structurally related to the monoamine releasing agents and psychostimulants aminorex and clominorex.
Sources: en.wikipedia.org
==== Animal production ==== The tendency toward fewer and larger farms has been accompanied by an increase in animal production, using fewer resources per produced unit. The number of dairy farmers has reduced to about 3,800 with an average herd size of 150 cows. The milk quota is 1,142 tonnes. More than half of the cows live in new loose-housing systems. Export of dairy products accounts for more than 20 percent of the total Danish agricultural export. The total number of cattle in 2011 was approximately 1.5 million. Of these, 565,000 were dairy cows and 99,000 were suckler cows. The yearly number of slaughtering of beef cattle is around 550,000. For more than 100 years the production of pigs and pig meat was a major source of income in Denmark. Approximately 90 percent of the production is exported. This accounts for almost half of all agricultural exports and for around 5 percent of Denmark's total exports. About 4,200 farmers produce 28 million pigs annually. Of these, 20.9 million are slaughtered in Denmark. Fur animal production on an industrial scale started in the 1930s in Denmark. Prior to a government-mandated culling during the COVID-19 pandemic, Denmark was the world's largest producer of mink furs, with 1,400 mink farmers fostering 17.2 million mink and producing around 14 million furs of the highest quality every year (see mink industry in Denmark). Approximately 98 percent of the skins sold at Kopenhagen Fur Auction were exported. Fur ranked as Danish agriculture's third largest export article, at more than DKK 7 billion annually.
2(Ag(NH3)2)+ + RCHO + 2OH− → RCOOH + 2Ag + 4NH3. The size and shape of the nanoparticles produced are difficult to control and often have wide distributions. However, this method is often used to apply thin coatings of silver particles onto surfaces and further study into producing more uniformly sized nanoparticles is being done.
=== May === 1 May – Manchester's Co-op Live venue postpones its opening for a third time. 2 May In England and Wales, the 2024 local elections take place, along with the 2024 London Assembly election, the 2024 London mayoral election, various other mayoral elections and police and crime commissioner elections. The Blackpool South by-election is also held. Forty-five protesters are arrested after obstructing a coach moving asylum seekers in Peckham to the Bibby Stockholm. John Swinney is set to become the next SNP leader and first minister after Kate Forbes confirms she will not seek the party's leadership. Goldman Sachs becomes the first firm to remove the cap on bankers' bonuses following the 2023 change in UK law regarding bonuses. The Organisation for Economic Co-operation and Development forecasts that the UK will have the slowest economic growth among the world's developed nations during 2025. A man is remanded in custody charged with the murder of Daniel Anjorin, as well as two counts of attempted murder. King Charles III is presented with his Coronation scroll, the first to be made without the use of animal skin. 3 May With 90% of council election results announced, the Conservatives have lost over 400 council seats, while Labour regains control of Hartlepool, Redditch, Rushmoor and Thurrock Councils. Ben Houchen wins the Tees Valley mayoral election, retaining the seat for the Conservatives, while Labour win mayoral elections in the East Midlands, North East and York and North Yorkshire.
== Evolution == Some 23-million-year-old fossils of arapaima or a very similar species have been found in the Miocene Villavieja Formation of Colombia. Museum specimens are found in France, England, the United States, Brazil, Guyana, Ecuador and Perú. This makes them some of the oldest known species of freshwater fish.
Sources: en.wikipedia.org
== Side effects == Side effects of vosilasarm in preliminary clinical studies in women with metastatic breast cancer have included vomiting (27%), dehydration (27%), constipation, decreased appetite and weight loss (27%), hypophosphatemia, decreased sex hormone-binding globulin (SHBG) levels (100%), increased prostate-specific antigen (PSA) levels (80%), and abnormal liver function tests, including elevated aspartate aminotransferase (59%), elevated alanine aminotransferase (46%), and elevated total blood bilirubin (27%). In gonadally intact male cynomolgus monkeys, vosilasarm suppressed testosterone levels by around 50% (from ~600–800 ng/dL to ~200–300 ng/dL) across three dose levels (0.01 mg/kg, 0.1 mg/kg, and 1.0 mg/kg). Changes in serum lipids, including of triglycerides, LDL cholesterol, and HDL cholesterol were also observed. Elevated liver enzymes were minimally observed in monkeys. A number of case reports of liver toxicity with non-medical use of vosilasarm have been published. A case report of acute myocarditis with non-medical use of vosilasarm also exists.
The crossover video game Lego Dimensions, which incorporates the use of Lego minifigures with a special gamepad, includes Portal-themed elements, as first demonstrated during its Electronic Entertainment Expo 2015 trailer. A Portal-themed level appears as part of the main story campaign, with GLaDOS playing a significant role in the game's plot. A Chell minifigure was released that comes packaged with buildable sentry turret and companion cube; the figure unlocks an additional level and open-world area based on the series when used in-game. The Portal levels include Easter eggs based on Doug Rattmann hiding himself away. The game also features a new song written by Jonathan Coulton and performed by Ellen McLain that plays over the end credits. The series' main antagonist, GLaDOS, was included as the dealer in Poker Night 2. This game features Portal themed unlockables such as playing cards, table and room. Wheatley is also featured as a bargaining chip. A Portal based pinball table for Zen Pinball 2, Pinball FX2, and Pinball FX3 was developed by Zen Studios in collaboration with Valve. GLaDOS guest stars in Defense Grid: The Awakening in a full-story expansion. A cosmetic set based on the Companion Cube was released as a visual replacement for the "Io" character in Valve's multiplayer online battle arena game, Dota 2. P-Body is a playable character in the Windows release of Super Bomberman R.
=== Olfactory transfer === There is about 20 mL capacity in the adult human nasal cavity. The major part of the approximately 150 cm2 surface in the human nasal cavity is covered by respiratory epithelium, across which systemic drug absorption can be achieved. The olfactory epithelium is situated in the upper posterior part and covers approximately 10 cm2 of the human nasal cavity. The nerve cells of the olfactory epithelium project into the olfactory bulb of the brain, which provides a direct connection between the brain and the external environment. The transfer of drugs to the brain from the blood circulation is normally hindered by the blood–brain barrier (BBB), which is virtually impermeable to passive diffusion of all but small, lipophilic substances. However, if drug substances can be transferred along the olfactory nerve cells, they can bypass the BBB and enter the brain directly. The olfactory transfer of drugs into the brain is thought to occur by either slow transport inside the olfactory nerve cells to the olfactory bulb or by faster transfer along the perineural space surrounding the olfactory nerve cells into the cerebrospinal fluid surrounding the olfactory bulbs and the brain. Olfactory transfer could theoretically be used to deliver drugs that have a required effect in the central nervous system such as those for Parkinson's or Alzheimer's diseases. Studies have been presented showing that direct transfer of drugs is achievable.
The Peaceful Revolution of 1989 resulted in the Socialist Unity Party of Germany giving up its monopoly on power, and permitting opposition parties to operate for the first time. They began to form in large numbers throughout November and December 1989. Opposition groups formed the East German Round Table, which was joined by representatives of the SED to negotiate reforms; at its first meeting on 7 December 1989, the Round Table agreed that elections to the Volkskammer would be held on 6 May 1990.
=== Early applications === In 1903, Ludwig Roselius popularized the use of benzene to decaffeinate coffee. This discovery led to the production of Sanka. This process was later discontinued. Benzene was historically used as a significant component in many consumer products such as liquid wrench, several paint strippers, rubber cements, spot removers, and other products. Manufacture of some of these benzene-containing formulations ceased in about 1950, although Liquid Wrench continued to contain significant amounts of benzene until the late 1970s.
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.
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.