The short version of GHRH receptor fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-08-24 and is reviewed periodically as new material appears.
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.
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 |
|---|---|---|
| Peptide class | Synthetic GHRH analogue | Built on a 29 residue sequence |
| Primary target | GHRH receptor (GHRHR) | Class B G protein coupled receptor |
| Unconjugated half life | Minutes | Limited by protease degradation |
| Key modification | Four residue substitutions | Positions 2, 8, 15 and 27 |
| Common synonym | Modified GRF(1-29) | Usually denotes the form without DAC |
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.
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 attached maleimide group explains the unusual duration of the DAC version. After injection it reacts with the thiol of cysteine-34 on serum albumin, forming a stable covalent bond. The resulting conjugate is too large for rapid kidney filtration and is shielded from many peptidases. Reported half-lives for this form reach several days, whereas the version without the group is cleared in roughly half an hour. That gap is the main pharmacological difference between the two.
Downstream of growth hormone, the liver and other tissues increase production of insulin-like growth factor 1, a mediator of many growth-promoting effects. Studies have documented elevated levels of both hormones after dosing, and the rise from the long-acting form persists longer than that produced by shorter-acting analogues. What remains unclear is whether sustained elevation of these markers translates into meaningful clinical benefit, and whether prolonged exposure carries risks that short trials could not detect.
At first glance, this result would seem to contradict the assertion that states choose alliance partners in order to balance against the strongest. Focusing solely on aggregate power would lead us to expect more states to ally with the Soviet Union, in order to prevent the United States from using its superior overall resources in harmful ways. Judging from the preponderance of aggregate power favoring the West, many states appear to have 'bandwagoned' rather than balanced by aligning with the United States. This is even more striking when one remembers that the United States was overwhelmingly the world's most powerful country in the immediate postwar period, yet was able to bring most of the other industrial powers into alignment with rather than against it. In 1986, still not envisaging the end of the Cold War in sight, Zbigniew Brzezinski emphasized the historical uniqueness of the current period regarding the preponderance of power: "[N]ever before would the eclipse of one of the major rival powers have given to the other effective global preponderance." Shortly after one of the rival superpowers eclipsed, the Pentagon Regional Defense Strategy (1992) formulized: "It is not in our interest … to return to earlier periods in which multiple military powers balanced one against another in what passed for security structures, while regional or even global peace hang in the balance." In the first post-Cold War year, Leffler advocated for the United States to continue its strategy of "preponderance of power".
=== Clinical trials === In addition to the increased production at the Dunn School, commercial production from a pilot plant established by Imperial Chemical Industries became available in January 1942, and Kembel, Bishop and Company delivered its first batch of 200 imperial gallons (910 L) on 11 September. Florey conducted a second series of clinical trials. Ethel was placed in charge, but while Florey was a consulting pathologist at Oxford hospitals and therefore entitled to use their wards and services, Ethel, to his annoyance, was accredited merely as his assistant. Doctors tended to refer patients to the trial who were in desperate circumstances rather than those who were the most suitable candidates for treatment, but when penicillin did succeed anyway, confidence in its efficacy rose. Harry Lambert, a friend of Fleming's dying from a meningococcal infection, became the twelfth case on 5 August 1942. He survived, but someone at St. Mary's Hospital leaked the result to the press, resulting in an editorial in The Times on 27 August. Florey was appalled; this could only create a public demand for penicillin when all available supplies were needed for the clinical trials. On 25 September, Florey met with Sir Cecil McAlpine Weir, the Director-General of Equipment and Stores at the Ministry of Supply, who promised overriding priority for the mass production of penicillin. Ethel and Howard Florey published the results of clinical trials of 187 cases of treatment with penicillin in The Lancet on 27 March 1943.
Most ABC transporters that mediate the uptake of nutrients and other molecules in bacteria rely on a high-affinity solute binding protein (BP). BPs are soluble proteins located in the periplasmic space between the inner and outer membranes of gram-negative bacteria. Gram-positive microorganisms lack a periplasm such that their binding protein is often a lipoprotein bound to the external face of the cell membrane. Some gram-positive bacteria have BPs fused to the transmembrane domain of the transporter itself. The first successful x-ray crystal structure of an intact ABC importer is the molybdenum transporter (ModBC-A) from Archaeoglobus fulgidus. Atomic-resolution structures of three other bacterial importers, E. coli BtuCD, E. coli maltose transporter (MalFGK2-E), and the putative metal-chelate transporter of Haemophilus influenzae, HI1470/1, have also been determined. The structures provided detailed pictures of the interaction of the transmembrane and ABC domains as well as revealed two different conformations with an opening in two opposite directions. Another common feature of importers is that each NBD is bound to one TMD primarily through a short cytoplasmic helix of the TMD, the "coupling helix". This portion of the EAA loop docks in a surface cleft formed between the RecA-like and helical ABC subdomains and lies approximately parallel to the membrane bilayer.
== External links == The LIVEChart of Nuclides – IAEA AlphaDelta: Stable Isotope fractionation calculator Archived 2011-04-02 at the Wayback Machine National Isotope Development Center Reference information on isotopes, and coordination and management of isotope production, availability, and distribution Isotope Development & Production for Research and Applications (IDPRA) U.S. Department of Energy program for isotope production and production research and development Isosciences Archived 2021-01-18 at the Wayback Machine Use and development of stable isotope labels in synthetic and biological molecules
Sources: en.wikipedia.org
==== 2014-current ==== Journalist Tengiz Ablotia wrote in 2014 that the EU commission was politically motivated. According to him the annexation of Crimea by the Russian Federation made clear that the Tagliavini report was based on a false notion that any conflict can always be avoided and that surrender can guarantee peace. Unlike Georgia, Ukraine did not fight back Russia in Crimea because Europeans wished so and then the war in Donbas began. The Russo-Ukrainian war marked the end of the Tagliavini epoch. When Heidi Tagliavini resigned in July 2015 as OSCE special envoy on Ukraine, an opinion piece in DELFI argued, that this "gives one hope that the conflict between Ukraine and Russia will not be given a Tagliavini treatment." Due to the report making the aggressor (Russia) and the victim (Georgia) equal, "Tagliavini helped Russia get away with what was obviously an international crime". After detailing some cases of bias in the commission's work, the opinion piece concluded that although Russia began the war in Georgia, "the flexible Swiss diplomat and her minions made it seem like Georgia was the provocateur" and thus emboldened Russia's president to attack Ukraine. A criticism of the supposed neutrality of Swiss diplomacy was published in 2018, in which it was noted that Heidi Tagliavini had spent a year in Russia in her youth which influenced her mindset. It was also noted that Abkhaz separatists called Tagliavini "the goldfish of the international community" and gave her a present in May 2008. It was also noted that Bloomberg L.P.
Manufacturing facilities must maintain a clean and hygienic manufacturing area. Manufacturing facilities must maintain controlled environmental conditions in order to prevent cross-contamination from adulterants and allergens that may render the product unsafe for human consumption or use. Manufacturing processes must be clearly defined and controlled. All critical processes are validated to ensure consistency and compliance with specifications. Manufacturing processes must be controlled, and any changes to the process must be evaluated. Changes that affect the quality of the drug are validated as necessary. Instructions and procedures must be written in clear and unambiguous language using good documentation practices. Operators must be trained to carry out and document procedures. Records must be made, manually or electronically, during manufacture that demonstrate that all the steps required by the defined procedures and instructions were in fact taken and that the quantity and quality of the food or drug was as expected. Deviations must be investigated and documented. Records of manufacture (including distribution) that enable the complete history of a batch to be traced must be retained in a comprehensible and accessible form. Any distribution of products must minimize any risk to their quality. A system must be in place for recalling any batch from sale or supply.
The key intermediate, normeperidine, is obtained by a scheme closely akin to the parent molecule. Thus, alkylation of benzyl cyanide (1) with the tosyl analog of the bischloroethylamine (2) leads to the substituted piperidine (3). Basic hydrolysis serves to convert the nitrile to the acid (4). Treatment of this last with sulfuric acid in ethanol serves both to esterify the acid and to remove the tosyl group to yield the secondary amine (5). Alkylation of that amine by means of N-(2-chloroethyl)morpholine gives morpheridine.
== Evidence-based medicine == Evidence-based medicine is defined as deploying the best current scientific evidence that is available to give the best treatment and make the best decision effectively and efficiently. Clinical guidelines are developed based on scientific evidence; for example, the ACC/AHA guidelines (for cardiovascular diseases), the GOLD guidelines (for chronic obstructive pulmonary disease), the GINA guidelines (for asthma), etc. They convert and classify the evidence using a systematic method, aiming to provide care with quality. The guidelines cannot substitute clinical judgment, as they cannot meet all the circumstances. Healthcare professionals can use the clinical guidelines as references or evidence to support their clinical judgement when prescribing therapy to patients. Example: Clinical Guideline for controlling blood pressure (hypertension) If there is an Asian male patient who is 40 years old and has recently been diagnosed with high blood pressure (with a blood pressure of 140/90) and without any other chronic diseases (comorbidities), such as type-2 diabetes, gout, benign prostatic hyperplasia, etc. His estimated 10-year risk of cardiovascular disease is 15%. According to the NICE 2019 Hypertension guideline, the healthcare professional can consider starting anti-hypertensive therapy after a discussion with the patient. The first-line therapy will be either an Angiotensin Converting Enzyme Inhibitor (ACEi) or an Angiotensin receptor blocker (ARB) (if the patient cannot tolerate ACEi).
As a small open economy, Denmark is very dependent on its foreign trade. In 2017, the value of total exports of goods and services made up 55% of GDP, whereas the value of total imports amounted to 47% of GDP. Trade in goods made up slightly more than 60% of both exports and imports, and trade in services the remaining close to 40%. Machinery, chemicals and related products like medicine and agricultural products were the largest groups of export goods in 2017. Service exports were dominated by freight sea transport services from the Danish merchant navy. Most of Denmark's most important trading partners are neighbouring countries. The five main importers of Danish goods and services in 2017 were Germany, Sweden, United Kingdom, United States and Norway. The five countries from which Denmark imported most goods and services in 2017 were Germany, Sweden, the Netherlands, China and United Kingdom. After having almost consistently an external balance of payments current account deficit since the beginning of the 1960s, Denmark has maintained a surplus on its BOP current account for every year since 1990, with the single exception of 1998. In 2017, the current account surplus amounted to approximately 8% of GDP. Consequently, Denmark has changed from a net debtor to a net creditor country. By 1 July 2018, the net foreign wealth or net international investment position of Denmark was equal to 64.6% of GDP, Denmark thus having the largest net foreign wealth relative to GDP of any EU country.
Sources: en.wikipedia.org
The names are often used interchangeably in casual writing, but they are not strictly identical. Modified GRF(1-29) refers to the unconjugated analogue carrying only the four substitutions. The version sold as CJC-1295 with DAC includes the albumin binding linker and clears much more slowly.
DAC stands for drug affinity complex, a term describing the maleimidopropionic acid linker. This group forms a covalent bond with the cysteine residue on serum albumin after administration. The resulting adduct is what extends the circulating half life from minutes to days.
No. It is entirely synthetic and does not correspond to any known endogenous peptide. The design starts from human growth hormone releasing hormone and introduces deliberate substitutions. Any biological effect comes from mimicking the natural hormone at its receptor.
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.