If you have been reading about GHRH analog and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2025-11-04. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
Naming in this area is inconsistent, and readers should treat product labels with care. In much of the literature and in vendor catalogs, the unqualified term refers to the albumin-binding version, while the version lacking the DAC group appears as modified GRF(1-29), mod GRF(1-29), or the same name with a without-DAC qualifier. Because one abbreviation has been applied to both materials, the only reliable way to identify a sample is to check the stated sequence and the presence of the linker.
CJC-1295 is the name used for a synthetic peptide modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. The compound was described by a Canadian drug discovery company in the mid-2000s as a long-acting research tool. Two closely related molecules share the name in practice: one carries a drug affinity complex, or DAC, group, and one does not. The distinction matters because the two behave differently in circulation.
The peptide backbone corresponds to GRF(1-29), the first 29 residues of native growth hormone-releasing hormone, which retains most of the receptor-activating activity of the full-length molecule. Four substitutions distinguish the analog from the natural sequence: D-alanine at position 2, glutamine at position 8, alanine at position 15, and leucine at position 27. These changes slow cleavage by dipeptidyl peptidase IV, the enzyme that degrades native hormone in plasma within minutes. The outcome is improved enzymatic stability combined with a still brief residence time when no additional modification is present.
| Property | Value | Notes |
|---|---|---|
| Duration with linker | Several days | Reported in early human work |
| Duration without linker | Tens of minutes | Short plasma residence |
| Albumin attachment site | Cysteine-34 | Covalent maleimide reaction |
| Primary receptor | Pituitary GHRH receptor | Stimulates growth hormone release |
| Downstream marker | Insulin-like growth factor 1 | Indirect measure of activity |
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.
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.
Lyophilised powder is the usual supplied form. The material is hygroscopic, so vials are typically equilibrated to room temperature before opening in order to prevent condensation on the contents. Long-term storage is generally described at minus twenty degrees Celsius or colder, protected from light and moisture. Repeated freeze-thaw cycles are avoided because they promote aggregation and loss of soluble material. A reconstituted solution is considerably less stable than the dry powder and is normally kept refrigerated for short periods only.
Identity and purity are assessed mainly by reversed-phase high-performance liquid chromatography combined with mass spectrometry. The chromatographic separation resolves the target peptide from truncation products and from species carrying oxidised residues, while mass measurement confirms the expected molecular mass. Because the two common variants differ by roughly 280 daltons, a mass determination distinguishes them unambiguously. Purity is often quoted as a percentage of total peak area, although that figure depends on the detection wavelength and the integration method applied.
Reported half-lives differ widely between the two variants and between species. Values for the albumin-binding form are usually expressed in days, while the unconjugated form is measured in minutes to a few hours. Sampling schedules, assay sensitivity, and route of administration all influence the numbers, which limits direct comparison across studies. Whether sustained receptor occupancy produces different downstream effects from pulsatile stimulation remains an open question in the published work. Claims about relative potency should therefore be read alongside the specific study design that produced them.
=== Executive committee === The management of the Society is vested in an Executive Committee made up of Officers and General Members, they also act as Trustees of the Society. There are currently 10 officers of the Society namely the Chair, Vice-Chair, Treasurer, General Secretary, Meetings Secretary, Papers Secretary, Education Officer, Publicity Secretary, Special Interest Group Co-ordinator, and Digital Communications Officer.
Reflecting on the band's hiatus in a 2011 interview, Kinney said that Staley wasn't the only one battling addiction. He was the focal point, like singers are. So they'd single him out. But the truth was, it was pretty much everybody. I definitely had my hand firmly on the wheel going off the cliff. And the reason we pulled back – you know when you stop when you have two No. 1 records, it's not really the greatest career move – but we did that because we love each other and we didn't want to die in public. And I know for a fact in my heart that if we were to continue that I wouldn't be on the phone right now talking to you. I wouldn't have made it. I just wouldn't have. After a decade of battling drug addiction, Layne Staley was found dead in his condominium on April 19, 2002. The autopsy and toxicology report revealed that he died from a mixture of heroin and cocaine, known as "speedball". The autopsy concluded that Staley died on April 5, two weeks before his body was found. Cantrell dedicated his 2002 solo album, Degradation Trip, released two months after Staley's death, to his memory. Mike Starr later claimed on Celebrity Rehab that he was the last person to see Staley alive, and admitted to feeling guilty about not calling 911 after Staley had warned him against it. "I wish I hadn't been high on benzodiazepine [that night], I wouldn't have just walked out the door," Starr said. Following Staley's death, Mike Inez joined Heart and toured and recorded with the band from 2002 through 2006.
During the war, Mexican cinema and, to a lesser extent, music and radio, experienced significant growth. The war in Europe made producing films on the continent increasingly difficult, which motivated their transfer to Mexican forums and studios such as the Estudios Churubusco and Azteca Studios in Mexico City and the deserts of Durango. Moreover, the mobilization of Hollywood stars on the war fronts forced the film industry to use Mexican actors. Aided by a slowdown of U.S. film production during the war, Mexican cinema spread throughout the world, where it left a permanent mark. Mexican cinema continued to produce high-quality works and began to explore other genres such as comedy, romance and musical. In 1943, the film Wild Flower brought together filmmaker Emilio Fernández, photographer Gabriel Figueroa, actor Pedro Armendariz and actress Dolores del Río. The films María Candelaria (1943) and The Pearl (1947), were considered pivotal works by Fernández and his team, and gave Mexican cinema international prestige, with their works being shown worldwide at major film festivals. In 1946, María Candelaria won the Palme d'Or at the Cannes Film Festival. In 1949, The Pearl won the Golden Globe for Best Cinematography, becoming the first Spanish-language film to receive such recognition.
On 20 October 2005, Hoffmann-La Roche decided to license other companies to manufacture Oseltamivir. Also in 2005, Roche acquired the Swiss company GlycArt Biotechnology in order to acquire technology to afucosylate antibodies; one of its products in development was obinutuzumab, which gained FDA approval in November 2013 for the treatment of chronic lymphocytic leukemia. On 22 January 2008, Roche acquired Ventana Medical Systems for $3.4 billion. On 2 January 2009, Roche acquired Memory Pharmaceuticals Corp. On 26 March 2009, Roche acquired Genentech for $46.8 billion. On 12 March 2009, Roche agreed to fully acquire Genentech, in which it had held a majority stake since 1990, after eight months of negotiations. As a result of the Genentech acquisition, Roche moved its Palo Alto–based research facilities to its campus that straddles the border between Clifton, New Jersey and Nutley, New Jersey while Roche's United States headquarters, located on the New Jersey site since 1929, was moved to Genentech's facility in South San Francisco. Genentech became a wholly owned subsidiary group of Roche on 25 March 2009. Roche began vacating the NJ site in 2012, and sold it off in 2016. Roche acquired Medingo Ltd. in April 2010, for $160 million and BioImagene, Inc. in August for $100 million. In 2011, the company received the International Society for Pharmaceutical Engineering Facility of the Year Award for Process Innovation for Roche's "MyDose" Clinical Supply project. In March 2011, Roche acquired PVT Probenverteiltechnik GmbH for up to €85 million.
== Discovery and background == Phalloidin was one of the first cyclic peptides to be discovered. It was isolated from the death cap mushroom and crystallized by Feodor Lynen and Ulrich Wieland in 1937. Its structure is unusual in that it contains a cysteine-tryptophan linkage to form a bicyclic heptapeptide. This linkage had not been characterized before and makes the structure elucidation of phalloidin significantly more difficult. They determined the presence of the sulfur atom using UV spectroscopy and found that this ring structure had a slightly shifted wavelength. Raney nickel experiments confirmed the presence of sulfur in the tryptophan ring. The researchers found the desulfurized phalloidin was still circular, which demonstrated that the structure of phalloidin is normally bicyclic. Once linearized, the amino acid sequence of de-sulfurized phalloidin was elucidated through Edman degradation by Wieland and Schön in 1955. Due to its high affinity for actin, scientists discovered its potential use as a staining reagent for effective visualization of actin in microscopy. Derivatives conjugated with fluorophores are sold widely. Because of its ability to selectively bind filamentous actin (F-actin) and not actin monomers (G-actin), fluorescently labeled phalloidin is more effective than antibodies against actin.
Sources: en.wikipedia.org
Both the Greek and Roman civilizations practiced ivory carving to make large quantities of high-value works of art, precious religious objects, and decorative boxes for costly objects. Ivory was often used to form the white of the eyes of statues. There is some evidence of either whale or walrus ivory used by the ancient Irish. Solinus, a Roman writer in the 3rd century claimed that the Celtic peoples in Ireland would decorate their sword-hilts with the 'teeth of beasts that swim in the sea'. Adomnan of Iona wrote a story about St Columba giving a sword decorated with carved ivory as a gift that a penitent would bring to his master so he could redeem himself from slavery. The Syrian and North African elephant populations were reduced to extinction, probably due to the demand for ivory in the Classical world. The Chinese have long valued ivory for both art and utilitarian objects. Early reference to the Chinese export of ivory is recorded after the Chinese explorer Zhang Qian ventured to the west to form alliances to enable the eventual free movement of Chinese goods to the west; as early as the first century BC, ivory was moved along the Northern Silk Road for consumption by western nations. Southeast Asian kingdoms included tusks of the Indian elephant in their annual tribute caravans to China. Chinese craftsmen carved ivory to make everything from images of deities to the pipe stems and end pieces of opium pipes.
== Treatment == Currently there is no cure for the disease. Symptomatic treatment, which aims to relieve symptoms and improve quality of life is the main treatment method of Bethlem myopathy. It is believed that physical therapy, stretching exercises, orthoses such as braces and splints, and mobility aids like a walker or wheelchair are beneficial to patient's condition. Surgical options could be considered in rare instances, in order to help with joint contractures or scoliosis. Contractures of the legs can be alleviated with heel-cord surgery followed by bracing and regular physical therapy. Repeated surgeries to lengthen the heel cords may be needed as the child grows to adulthood.
A germanium-68/gallium-68 generator is a device used to extract the positron-emitting isotope 68Ga of gallium from a source of decaying germanium-68. The parent isotope 68Ge has a half-life of 271.05 days and can be easily utilized for in-hospital production of 68Ga. Its decay product gallium-68 (half-life 67.84 minutes, inconvenient for transport) is extracted and used for certain positron emission tomography nuclear medicine diagnostic procedures, where the radioisotope's relatively short half-life and emission of positrons are useful for creation of 3-dimensional PET scans.
Diarrhea Rash Fever Facial swelling Difficulty breathing Unusual bleeding Seizures This medicine is passed through breast milk, so its use during pregnancy or breastfeeding should only be done when clearly needed. Primaxin is cleared from the body by the kidneys, so it is important to tell one's doctor about any other drugs being taken that are also cleared through the kidneys (such as other antibiotics), especially for older patients, as kidney function declines with age. Patients who are allergic to penicillin, cephalosporins, and related drugs may react to imipenem. It is important tell one's doctor or pharmacist one's medical history, especially of brain disorders (e.g., seizures, head injury, tumor), kidney disease, liver disease, and stomach/intestinal diseases (e.g., colitis).
Sources: en.wikipedia.org
In the simulated moving bed technique instead of moving the bed, the feed inlet, the solvent or eluent inlet and the desired product exit and undesired product exit positions are moved continuously, giving the impression of a moving bed, with continuous flow of solid particles and continuous flow of liquid in the opposite direction of the solid particles.
Carlton – The rivalry between Essendon and Carlton is considered one of the strongest in the league. With the teams sharing the record of 16 premierships, both sides are keen to become outright leader, or if out of the finals race, at least ensure the other doesn't. In recent years, the rivalry has thickened, with Carlton beating the 1999 Minor Premiers and premiership favourites by 1 point in the Preliminary Final. Other notable meetings between the two clubs include the 1908, 1947, 1949, 1962 and 1968 VFL Grand Finals and 1993 AFL Grand Final, with some decided by small margins. Of the 6 Grand Finals played out of the two clubs, Essendon has won 3 and Carlton has won 3. Collingwood – In the early days of the VFL, this rivalry grew out of several Grand Final meetings: 1901, 1902 and 1911. The teams didn't meet again in a Grand Final until 1990 when Collingwood won to draw level with the Bombers on 14 premierships and deny the Bombers a chance to join Carlton with 15 flags. Since 1995, the clubs face off against each other annually in the Anzac Day clash, a match which is described as the second biggest of the season (behind only the Grand Final). Being possibly the two biggest football clubs in Victoria, regardless of their position on the ladder, this game always attracts a huge crowd, and it is a match both teams have a great desire to win regardless of either team's season prospects. The rivalry thickened further in 2023 when Collingwood joined Essendon and Carlton with a record 16 premierships.
=== Prosthetics === Prosthetics in the early modern period were made from wood, metal, and leather. The majority of prosthetic artifacts from the period still around today were made of metal. In Germany, metal mechanical hands were made with ratchets and springs. The springs allowed for movement of the fingers, while the ratchets locked them in place. The wearer was able to control the fingers by releasing the ratchets through buttons or levers, depending on the hand. The specific mechanics of the hand varied by prosthetic. Mechanical prosthetics were the work of artisans, specifically locksmiths and clockmakers. This was because locksmiths and clockmakers were already using springs and ratchets to make locks, doors, and clocks.
Sources: en.wikipedia.org
A maleimide moiety reacts with the thiol of cysteine-34, forming a covalent bond. The reaction occurs in circulation without enzymatic catalysis.
The group is intended to alter distribution and persistence, not receptor engagement. The peptide portion still binds the pituitary receptor, so the primary difference is duration rather than potency.
Not firmly. Early reports describe several days for the extended form, but independent confirmations are sparse, and values vary with assay method and study design.
No. It is a laboratory-made analog of growth hormone-releasing hormone. The natural hormone is a 44-residue peptide, while the analog is built on a shorter 29-residue fragment.