Everything below concerns GRF(1-29). We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-11-29. Where a claim depends on a specific study, the study is described rather than over-claimed.
Binding of the peptide to the growth hormone-releasing hormone receptor on pituitary somatotrophs triggers a G protein coupled cascade that raises cyclic AMP and opens calcium channels. The result is greater secretion of growth hormone into the bloodstream. Because the peptide acts at the same receptor as the natural hypothalamic hormone, its effect is amplified pulse size rather than an entirely separate release pathway. Receptor binding alone does not determine the response, since somatostatin tone and other inputs modulate the final output.
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.
The drug affinity complex is a maleimidopropionic acid group attached to a lysine side chain. It reacts with the free thiol of cysteine-34 on circulating albumin, forming a covalent bond. This conjugation keeps the peptide in the bloodstream and shields it from rapid renal filtration and proteolysis. Reported circulation half-lives for the albumin-bound form fall in the range of roughly six to nine days in early human studies.
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.
| Property | Value | Notes |
|---|---|---|
| Target receptor | GHRH receptor (GHRHR) | Expressed on pituitary somatotrophs |
| Primary action | Stimulates growth hormone release | Amplifies pulse size |
| Half-life, albumin-binding form | Several days as reported | Slow release from albumin complex |
| Half-life, unmodified analog | About 30 minutes in animal estimates | Cleared by proteases and filtration |
| Common analytical approach | LC-MS/MS for peptide, immunoassay for hormones | Methods answer different questions |
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.
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.
=== 1971 === January 25: Idi Amin launches a successful coup d'état against Milton Obote in Uganda and declares himself President of Uganda. Under Amin, Uganda would switch allegiances to the Eastern Bloc and develop strong ties to the Soviet Union and East Germany. February 8: South Vietnamese forces enter Laos to briefly cut the Ho Chi Minh Trail. February 11: Seabed Arms Control Treaty is signed banning the placement of nuclear weapons outside of a country's 12-mile (22.2 km) coastal zone. March 10: Dominion of Ceylon declared under emergency conditions after communist People's Liberation Front attacks the American embassy. March 25 : Bangladeshi genocide From The West Pakistani Troops until 16 December March 26: Bangladeshi Declaration of Independence and Bangladesh Liberation War begin April 19: Salyut 1 is launched becoming the first space station. May 15: Anwar Sadat's Corrective Revolution purges Nasserist members of the government and security forces, and eventually expels the Soviet military from Egypt. May 28: Mars 3 is launched. May 30: Mariner 9 is launched. July 19–22: a communist-backed coup attempted unsuccessfully against Jaafar Nimeiry in Sudan. September: 105 Soviet officials expelled from Great Britain by Prime Minister Edward Heath in Operation FOOT. September 3: Four-Power Agreement on Berlin is signed by the United Kingdom, the Soviet Union, France, and the United States. October 11: Salyut 1 burns up in the atmosphere.
[A]bout one-third of the Gratiot-area's families eventually moved to public housing, but 35 percent of the families in the area could not be traced. The best-informed city officials believed that a majority of families moved to neighborhoods within a mile of the Gratiot site, crowding into an already decaying part of the city, and finding houses scarcely better and often more overcrowded than that which they had left.
==== Motile sperm organelle morphology examination ==== A motile sperm organelle morphology examination (MSOME) is a particular morphologic investigation wherein an inverted light microscope equipped with high-power optics and enhanced by digital imaging is used to achieve a magnification above x6000, which is much higher than the magnification used habitually by embryologists in spermatozoa selection for intracytoplasmic sperm injection (x200 to x400). A potential finding on MSOME is the presence of sperm vacuoles, which are associated with sperm chromatin immaturity, particularly in the case of large vacuoles.
== Pseudoverdine == A compound related to pyoverdine, called pseudoverdine (formally known as 3-formylamino-6,7-dihydroxycoumarin) is also produced by some fluorescent Pseudomonads. It is thought that pseudoverdine and pyoverdine may arise from a common precursor, 2,4,5-trihydroxyphenylalanine, which may condense with L-2,4-diaminobutyric acid to initiate pyoverdine production. Pseudoverdine is relatively similar to pyoverdine in its fluorescence and other spectroscopic properties, and its ability to chelate ferric iron, albeit at much lower affinity. Unlike pyoverdine, it is incapable of transporting iron into cells, likely due to the absence of the peptide chain. Another dissimilarity is that pseudoverdine does not appear to be regulated by the same processes as pyoverdine.
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==== Type 1C ==== Type 1C VWD indicates patients with quantitative deficiency due to an enhanced VWF clearance, accounting for ~15% to 20% of cases. Such patients may require VWF concentrate to treat/prevent bleeds.
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Human diploid cell rabies vaccines (HDCV) Approved HDCVs are grown in the MRC-5 cell line and contains the Pitman-Moore L503 or Flury strain. They are purified by ultrafiltration. HDCVs were first experimentally made by using the WI-38 cell line in 1961. This was a gift to Hilary Koprowski at the Wistar Institute by Leonard Hayflick, an Associate Member, who developed this normal human diploid cell strain. Purified chick embryo cell vaccinee (PCECV) Produced by growing fixed rabies virus strain Flury LEP-25 in primary cultures of chick fibroblasts. Ultracentrifuged. Purified Vero cell rabies vaccine (PVRV) Produced by growing the Wister strain in vero cells, which means the vaccine can be made by growing in a bioreactor vat, making it easier to mass produce. Ultracentrifuged. Brand names include Verorab (Sanofi-Aventis) and Speeda (Liaoning Chengda). Verorab is approved in the Australia European Union. It is also prequalified by the WHO, which means that it is considered appropriate to be used by UN organizations. Primary Hamster Kidney Cell vaccine (PHKCV) Contains the Beijing strain grown in baby hamster kidney cells. Ultracentrifuged. Purified duck embryo vaccine (PDEV) Grown in fertilized duck eggs and ultracentrifuged.
=== Death and legacy === Several retrospective sources state that Liu was greatly saddened by Zhou Enlai's death in January 1976 and, according to Guangming Daily, even had himself carried on a stretcher to the Beijing Hospital to bid farewell to Zhou's remains. Having been diagnosed with cancer in 1975, Liu's own health deteriorated shortly after, and he died of his illness in Beijing on June 24, 1976. He was 81. His memorial service was held at the Babaoshan Revolutionary Cemetery and was presided by Vice Premier and general Chen Xilian. The June 30, 1976 issue of the People's Daily reported that Vice Chairperson Li Suwen delivered Liu's eulogy. According to the eulogy, Liu Wenhui supported Chairman Mao, the Cultural Revolution, the movement to criticize Lin Biao and Confucius, and finally the ongoing campaign against Deng Xiaoping. He had also called for the liberation of Taiwan from Kuomintang rule. Present at his funeral were several politicians including Wu De, Li Jingquan, Ngapoi Ngawang Jigme, and Zhou Jianren, among others. Marshals Zhu De, Ye Jianying, and Liu Bocheng sent wreaths to the funeral, as well as Hua Guofeng and Song Qingling.
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The two substrates of this enzyme are L-aspartic acid and oxygen. Its products are iminosuccinic acid and hydrogen peroxide. In Escherichia coli another enzyme, quinolinate synthase, takes the product with dihydroxyacetone phosphate to form quinolinic acid but simple hydrolysis gives oxaloacetic acid. This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-NH2 group of donors with oxygen as acceptor. The systematic name of this enzyme class is L-aspartate:oxygen oxidoreductase (deaminating). This enzyme is part of the pathway for alanine metabolism and nicotinamide adenine dinucleotide biosynthesis. It employs one cofactor, flavin adenine dinucleotide.
Sources: en.wikipedia.org
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.
Typical endpoints include growth hormone pulse frequency and amplitude, together with insulin-like growth factor 1 concentration. Some protocols add body composition or metabolic markers. Interpretation depends on baseline hormonal status, which varies widely between individuals.
Most human data come from small, early-stage studies, and independent replication is limited. Short-term effects on growth hormone release are documented; longer-term outcomes are not well characterized. Open questions include changes in pituitary responsiveness after repeated exposure.
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.