GHRH receptor raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2026-04-02 and is reviewed periodically as new material appears.
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.
CJC-1295 is a synthetic analogue of growth hormone-releasing hormone, built on the 29-amino-acid GHRH(1-29) fragment. Four substitutions distinguish it from the natural sequence: D-alanine at position 2, glutamine at position 8, alanine at position 15, and leucine at position 27. These changes reduce enzymatic cleavage and extend the peptide's persistence in circulation. The compound is discussed in two forms, one carrying a drug affinity complex and one without it.
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.
Identity and purity are established with reversed phase high performance liquid chromatography coupled to mass spectrometry. The chromatographic step separates the target peptide from truncated sequences and deletion products, while the mass measurement confirms the expected molecular weight to within a fraction of a dalton. Because the two common variants differ by the presence of the linker, mass alone can distinguish them in the unconjugated state. Amino acid analysis and peptide mapping are used when sequence level confirmation is required.
| Property | Value | Notes |
|---|---|---|
| Physical form | Lyophilized white powder | Supplied as a freeze-dried solid for research use |
| Molecular weight | Approximately 3,647 Da (DAC form) | Lower for the variant lacking the albumin-binding moiety |
| Solubility | Soluble in water and aqueous buffer | Typically dissolved in sterile or bacteriostatic water |
| Typical storage temperature | −20 °C or below | Dry powder, desiccated and protected from light |
| Common analytical method | Reversed-phase HPLC with mass spectrometry | Used for purity estimation and identity confirmation |
Clearance profiles diverge sharply between the two versions. The albumin-binding molecule stays in plasma for several days, whereas the unmodified analog is largely gone within about half an hour in reported work. Cleavage by dipeptidyl peptidase IV is a major contributor to the short life of the unmodified sequence. These gaps mean the two versions cannot be substituted for each other in study design or in reading results side by side.
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.
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.
Indocyanine green is an FDA-approved photothermal agent that is primarily used in imaging techniques, but also displays anticancer and antimicrobial activity through photothermal therapy (PTT) treatments. Photothermal agents are active against diseased cells by accumulating in or around target cells, then converting light energy directly to heat, killing the target through heat-related damage. PTT has a low level of selectivity beyond the accumulation stage, in which it tends to preferentially accumulate within diseased and bacterial cells. This increases broadband antibiotic activity and decreases the likelihood of resistance development, but also raises the impact on human cells. Human cells experience irreversible damage in the range of 46-60 °C, which is below temperatures reached by some photothermal agents during photothermal therapy. Human cell viability may be maintained through low temperature PTT (≤ 45 °C), which is typically only possible in combination with an additional antibiotic or photodynamic activity.
Dirt is the second studio album by the American rock band Alice in Chains, released on September 29, 1992, by Columbia Records. It was the band's last album recorded with all four original members, as bassist Mike Starr was fired in January 1993 during the tour to support the album. The majority of the songs were written by guitarist Jerry Cantrell, but for the first time, vocalist Layne Staley wrote two songs by himself ("Hate to Feel" and "Angry Chair"), featuring himself on guitar. The track "Iron Gland" features Tom Araya from Slayer on vocals. The album's lyrics explore depression, pain, anger, anti-social behavior, relationships, drug addiction (primarily heroin), war, death, and other emotionally charged topics. Dirt received critical acclaim and charted in Australia, Canada, the Netherlands, Finland, Germany, New Zealand, Norway, Sweden, and the United Kingdom. In the US, it peaked at number 6 on the Billboard 200 chart. The album spawned five singles: "Would?", "Them Bones", "Angry Chair", "Rooster", and "Down in a Hole", all with accompanying music videos. Dirt was nominated for the Grammy Award for Best Hard Rock Performance. It is certified 5× platinum by the Recording Industry Association of America (RIAA), making it Alice in Chains' most commercially successful album. Dirt is often considered a landmark album of the grunge era and been included in numerous best album lists. According to a writer of Pitchfork, the album made Alice in Chains "one of the most famous bands in the world".
== Properties == Affimers are recombinant proteins. As they are manufactured using recombinant bacterial production processes, the batch-to-batch consistency for Affimers is improved compared to polyclonal antibodies, overcoming some of the issues of reproducibility and security of supply. These synthetic antibodies were engineered to be stable, non-toxic, biologically neutral and contain no post-translational modifications or disulfide bridges. Two separate loop sequences, incorporating a total of 12 to 36 amino acids, form the target interaction surface so interaction surfaces can range form 650–1000 Å. The large interaction surface results allows binding to target proteins.
== Adverse effects == The New England Journal of Medicine published two editorials in 2003 expressing concern about off-label uses of HGH and the proliferation of advertisements for "HGH-Releasing" dietary supplements, and emphasized that there is no evidence that use of HGH in healthy adults or in geriatric patients is safe and effective – and especially emphasized that risks of long-term HGH treatment are unknown. One editorial was by Jeffrey M. Drazen, M.D., the editor-in-chief of the journal; the other one was by Mary Lee Vance, who provided the NEJM's editorial original, cautious comment on a much cited 1990 study on the use of HGH in geriatric patients with low growth hormone levels. A small but controlled study of GH given to severely ill adults in an intensive care unit setting for the purpose of increasing strength and reducing the muscle wasting of critical illness showed a higher mortality rate for the patients having received GH. The reason is unknown, but GH is now rarely used in ICU patients unless they have severe growth hormone deficiency. GH treatment usually decreases insulin sensitivity, but some studies showed no evidence for increased diabetes incidence in GH-treated adult hypopituitary patients. In past it was believed that GH treatment could increase the cancer risk; a large study recently concluded that "With relatively short follow-up, the overall primary cancer risk in 6840 patients receiving GH as adults was not increased.
=== Interbellum (1918–1939) === Elements of the Army operated around Mary, Turkmenistan in 1918–19. See Malleson mission and Entente intervention in the Russian Civil War. The army then took part in the Third Anglo-Afghan War of 1919. In the aftermath of the First World War, the Indian Territorial Force and Auxiliary Force (India) were created in the 1920s. The Indian Territorial Force was a part-time, paid, all-volunteer organisation within the army. Its units were primarily made up of European officers and Indian other ranks. The ITF was created by the Indian Territorial Force Act 1920 to replace the Indian section of the Indian Defence Force. It was an all-volunteer force modelled after the British Territorial Army. The European parallel to the ITF was the Auxiliary Force (India). After the First World War the British started the process of Indianisation, by which Indians were promoted into higher officer ranks. In a 1923 census, the British Indian Army consisted of 64,669 British-born soldiers and officers, with 187,432 Indian-born soldiers in comparison. Indian cadets were sent to study in Great Britain at the Royal Military College, Sandhurst, and were given full commissions as King's Commissioned Indian Officers. The KCIOs were equivalent in every way to British commissioned officers and had full authority over British troops (unlike VCOs). Some KCIOs were attached to British Army units for a part of their careers.
Sources: en.wikipedia.org
== Biosynthesis == The amino acid tyrosine is metabolised in a series of reactions, one of which is catalysed by homogentisate 1,2-dioxygenase. This converts the intermediate homogentisic acid into 4-maleylacetoacetic acid.
== Occurrence and nomenclature == The term nucleic acid is the overall name for DNA and RNA, members of a family of biopolymers, and is a type of polynucleotide. Nucleic acids were named for their initial discovery within the nucleus, and for the presence of phosphate groups (related to phosphoric acid). Although first discovered within the nucleus of eukaryotic cells, nucleic acids are now known to be found in all life forms including within bacteria, archaea, mitochondria, chloroplasts, and viruses (There is debate as to whether viruses are living or non-living). All living cells contain both DNA and RNA (except some cells such as mature red blood cells), while viruses contain either DNA or RNA, but usually not both. The basic component of biological nucleic acids is the nucleotide, each of which contains a pentose sugar (ribose or deoxyribose), a phosphate group, and a nucleobase. Nucleic acids are also generated within the laboratory, through the use of enzymes (DNA and RNA polymerases) and by solid-phase chemical synthesis.
During Alice in Chains' hiatus, reports of Staley's addiction began to gain widespread circulation in fan and media communities, in part due to changes in his physical condition brought on by prolonged heroin abuse. Alice in Chains regrouped to record Alice in Chains, sometimes referred to as "Tripod" due to the cover featuring a three-legged dog, which was released in November 1995. The album debuted at the top of the U.S. charts, and has since been awarded—along with Facelift and Jar of Flies—double platinum status. With the exceptions of "Grind", "Heaven Beside You", and "Over Now", the lyrics were all written by Staley, making this album his greatest lyrical contribution to the band's catalog. To accompany the album, the band released a home video, The Nona Tapes, but the band lapsed again, failing to complete tours planned in support of the album. When asked about the frustration of not touring to support the record, Cantrell provided some insight into how Staley's addictions led to tensions within the band: "Very frustrating, but we stuck it out. We rode the good times together, and we stuck together through the hard times. We never stabbed each other in the back and spilled our guts and [did] that kind of bullshit that you see happen a lot." "Drugs worked for me for years", Staley told Rolling Stone in February 1996, "and now they're turning against me, now I'm walking through hell and this sucks. I didn't want my fans to think that heroin was cool. But then I've had fans come up to me and give me the thumbs up, telling me they're high.
Failing to build an anti-Nazi coalition in Europe, the Soviet Union signed a non-aggression pact with Nazi Germany in 1939. However, in 1941, Germany invaded the Soviet Union in the largest land invasion in history, opening the Eastern Front of World War II. The Soviet Union played a decisive role in defeating the Axis powers as part of the Allies, while extending its sphere of influence to Central and Eastern Europe. With around 27 million casualties, it suffered the most deaths of any country in World War II. In the war's aftermath, the Soviet Union consolidated the territories occupied by the Red Army into satellite states and undertook rapid economic development, cementing its status as a superpower. Geopolitical tensions with the United States led to the Cold War. The US-led Western Bloc coalesced into the NATO military alliance in 1949, prompting the Eastern Bloc to form the Warsaw Pact in 1955. With little direct combat, the blocs engaged in ideological and proxy wars. In 1953, following Stalin's death, Nikita Khrushchev initiated a campaign of de-Stalinization, which led to ideological tensions with communist China, under Mao Zedong, and culminated in an acrimonious split. The Soviet military suppressed uprisings in East Germany, Hungary and Czechoslovakia, while the resolution of the Cuban Missile Crisis narrowly averted a global conflict. Under Leonid Brezhnev, prosperity shifted toward stagnation, although relations with the US eased. In 1985, Mikhail Gorbachev sought reform through his policies of glasnost and perestroika.
Sources: en.wikipedia.org
Deuterium is produced for industrial, scientific and military purposes, by starting with ordinary water—a small fraction of which is naturally occurring heavy water—and then separating out the heavy water by the Girdler sulfide process, distillation, or other methods. In theory, deuterium for heavy water could be created in a nuclear reactor, but separation from ordinary water is the cheapest bulk production process. The world's leading supplier of deuterium was Atomic Energy of Canada Limited until 1997, when the last heavy water plant was shut down. Canada uses heavy water as a neutron moderator for the operation of the CANDU reactor design. Another major producer of heavy water is India. All but one of India's atomic energy plants are pressurized heavy water plants, which use natural (i.e., not enriched) uranium. India has eight heavy water plants, of which seven are in operation. Six plants, of which five are in operation, are based on D–H exchange in ammonia gas. The other two plants extract deuterium from natural water in a process that uses hydrogen sulfide gas at high pressure. While India is self-sufficient in heavy water for its own use, India also exports reactor-grade heavy water.
Shelf life is the length of time that a commodity may be stored without becoming unfit for use, consumption, or sale. In other words, it might refer to whether a commodity should no longer be on a pantry shelf (unfit for use), or no longer on a supermarket shelf (unfit for sale, but not yet unfit for use). It applies to cosmetics, foods and beverages, medical devices, medicines, explosives, pharmaceutical drugs, chemicals, tyres, batteries, and many other perishable items. In some regions, an advisory best before, mandatory use by or freshness date is required on packaged perishable foods. The concept of expiration date is related but legally distinct in some jurisdictions.
== External links == Molds and Moisture – Environmental Protection Agency (EPA) http://www2.lib.udel.edu/Preservation/mold.htm http://preserve.harvard.edu/guidelines/_mold.contamination.pdf http://www.loc.gov/preserv/emerg/dry.html
The witch doctor drinks a very small amount each time and knows well how many times he can sample the brew without losing his senses to properly conduct the ritual and lead the choir". Another report produced in 1737 by the missionary Pablo Maroni, describes the use of a psychoactive liana called ayahuasca for divination in the Napo River, Ecuador: "For divination, they use a beverage, some of white datura flowers, which they also call Campana due to its shape, and others from a vine commonly known as Ayahuasca, both highly effective at numbing the senses and even at taking one's life if taken in excess. They also occasionally use these substances for the treatment of common illnesses, especially headaches. So, the person who wants to divine drinks the chosen substance with certain rituals, and while deprived of their senses from the mouth downwards, to prevent the strength of the plant from harming them, they remain in this state for many hours and sometimes even two or three days until the effects run their course, and the intoxication subsides. After this, they reflect on what their imagination revealed, which occasionally remains with them for delirium. This is what they consider accomplished and propagate as an oracle." Latter reports were produced by Juan Magnin in 1740, describing ayahuasca use as a medicinal plant by the "Jivaroan" peoples (called ayahuessa) and by Franz Xaver Veigl in 1768, that reports about several "dangerous plants", including a bitter liana used for precognition and sorcery.
=== Red blood cell production === Erythropoietin is an essential hormone for red blood cell production. Without it, definitive erythropoiesis does not take place. Under hypoxic conditions, the kidney will produce and secrete erythropoietin to increase the production of red blood cells by targeting CFU-E, proerythroblast and basophilic erythroblast subsets in the differentiation. Erythropoietin has its primary effect on red blood cell progenitors and precursors (which are found in the bone marrow in humans) by promoting their survival through protecting these cells from apoptosis, or cell death. Erythropoietin is the primary erythropoietic factor that cooperates with various other growth factors (e.g., IL-3, IL-6, glucocorticoids, and SCF) involved in the development of erythroid lineage from multipotent progenitors. The burst-forming unit-erythroid (BFU-E) cells start erythropoietin receptor expression and are sensitive to erythropoietin. Subsequent stage, the colony-forming unit-erythroid (CFU-E), expresses maximal erythropoietin receptor density and is completely dependent on erythropoietin for further differentiation. Precursors of red cells, the proerythroblasts and basophilic erythroblasts also express erythropoietin receptor and are therefore affected by it.
Sources: en.wikipedia.org
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.
It has not been approved by major regulatory agencies for any therapeutic indication. Material sold under this name is typically distributed for laboratory research only. Clinical use is not supported by large controlled trials.
Early human studies of the albumin-binding form reported circulation half-lives on the order of several days. The value depends on assay method and study design. Estimates for the form without the binding moiety are considerably shorter.
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.