This is a working overview of GHRH analog, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-10-21 and is reviewed periodically as new material appears.
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.
CJC-1295 is a synthetic peptide analog of growth hormone-releasing hormone, constructed on the 29-amino-acid fragment designated GRF(1-29). The name began as an internal development code during the 1990s and later spread through research supply catalogs and discussion forums. The molecule does not occur in nature; its sequence is engineered rather than isolated from tissue. Two related compounds are sold under this single label, and they differ by one appended chemical group that strongly influences how long the peptide remains in circulation.
The dividing feature between the two forms is a maleimide-based drug affinity complex, abbreviated DAC. In the DAC-bearing version, a linker attaches the peptide to serum albumin after administration, and that association slows removal from plasma. The version lacking DAC appears in catalogs as MOD GRF(1-29) or tetrasubstituted GRF(1-29). Because informal writing treats both as one item, comparisons drawn from such sources routinely blend measurements taken from two molecules with substantially different behavior.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic peptide | Analog of growth hormone-releasing hormone |
| Chain length | 29 amino acids | Based on the GRF(1-29) fragment |
| Appearance | White to off-white lyophilized powder | Common research supply form |
| Solubility | Soluble in water and aqueous buffers | Powder requires reconstitution before use |
| Typical storage | −20 °C or below | Kept away from light and moisture |
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.
Lyophilized peptide powder is comparatively stable when kept dry, cold, and protected from light. Once dissolved, the molecule is vulnerable to deamidation, oxidation, and aggregation, with the rate depending on pH, buffer composition, and temperature. Alkaline conditions and repeated freeze-thaw cycles accelerate loss of the intact peptide. The methionine present in the native sequence is a known oxidation site, which is one reason it was replaced in the modified fragment. Suppliers typically recommend cold storage of solutions and use within a short window.
Analytical confirmation usually relies on reversed-phase high-performance liquid chromatography for purity and on liquid chromatography coupled to mass spectrometry for identity. Mass data reveal the expected molecular mass and can flag truncated or oxidized species. Amino acid analysis and peptide mapping provide sequence-level verification. Immunoassays are used in some biological matrices, but antibodies raised against one releasing-hormone analog may cross-react with another. Reported purity figures depend heavily on the method used, so comparisons between suppliers require matching the analytical approach.
=== Pharmacodynamics === Levomethadone has approximately 50x the potency of the S-(+)-enantiomer as well as greater μ-opioid receptor selectivity. Accordingly, it is about twice as potent as methadone by weight and its effects are virtually identical in comparison. In addition to its activity at the opioid receptors, levomethadone has been found to act as a weak competitive antagonist of the N-methyl-D-aspartate (NMDA) receptor complex and as a potent noncompetitive antagonist of the α3β4 nicotinic acetylcholine (nACh) receptor.
==== Pregnancy ==== In pregnant women, ACE inhibitors taken during all the trimesters have been reported to cause congenital malformations, stillbirths, and neonatal deaths. Commonly reported fetal abnormalities include hypotension, renal dysplasia, anuria/oliguria, oligohydramnios, intrauterine growth retardation, pulmonary hypoplasia, patent ductus arteriosus, and incomplete ossification of the skull. Overall, about half of newborns exposed to ACE inhibitors are adversely affected, leading to birth defects. ACE inhibitors are ADEC pregnancy category D and should be avoided in women who are likely to become pregnant. In the U.S., ACE inhibitors must be labeled with a boxed warning concerning the risk of birth defects when taken during the second and third trimester. Their use in the first trimester is also associated with a risk of major congenital malformations, particularly affecting the cardiovascular and central nervous systems.
=== Influenza === A study of an outbreak of an (H1N1) influenza in an Israeli military unit of 336 healthy young men to determine the relation of cigarette smoking to the incidence of clinically apparent influenza, revealed that, of 168 smokers, 69% had influenza, as compared with 47% of non-smokers. Influenza was also more severe in the smokers; 51% of them lost work days or required bed rest, or both, as compared with 30% of the non-smokers. According to a study of 1,900 male cadets after the 1968 Hong Kong A2 influenza epidemic at a South Carolina military academy, compared with people who did not smoke, people who smoked heavily (more than 20 cigarettes per day) had 21% more illnesses and 20% more bed rest, people who smoked lightly (20 cigarettes or fewer per day) had 10% more illnesses and 7% more bed rest. The effect of cigarette smoking on epidemic influenza was studied prospectively among 1,811 male college students. Clinical influenza incidence among those who smoked 21 or more cigarettes daily was 21% higher than that of people who did not smoke. Influenza incidence among people who smoked 1 to 20 cigarettes daily was intermediate between those who did not smoke and people who smoked heavily. Surveillance of a 1979 influenza outbreak at a military base for women in Israel revealed that influenza symptoms developed in 60% of the current smokers vs. 42% of the non-smokers. Smoking seems to cause a higher relative influenza risk in older populations than in younger populations.
Sources: en.wikipedia.org
Prescott DJ, Vagelos PR (1972). "Acyl carrier protein". Advances in Enzymology and Related Areas of Molecular Biology. Advances in Enzymology - and Related Areas of Molecular Biology. Vol. 36. pp. 269–311. doi:10.1002/9780470122815.ch8. ISBN 9780470122815. PMID 4561013. Vance DE, Mitsuhashi O, Bloch K (1973). "Purification and properties of the fatty acid synthetase from Mycobacterium phlei". J. Biol. Chem. 248 (7): 2303–9. doi:10.1016/S0021-9258(19)44110-0. PMID 4698221. Williamson IP, Wakil SJ (1966). "Studies on the mechanism of fatty acid synthesis. XVII. Preparation and general properties of acetyl coenzyme A and malonyl coenzyme A-acyl carrier protein transacylases". J. Biol. Chem. 241 (10): 2326–32. doi:10.1016/S0021-9258(18)96625-1. PMID 5330116. Lowe PN, Rhodes S (1988). "Purification and characterization of acyl-carrier-protein acetyltransferase from Escherichia coli". Biochem. J. 250 (3): 789–96. doi:10.1042/bj2500789. PMC 1148925. PMID 3291856. Tsay JT, Oh W, Larson TJ, Jackowski S, Rock CO (1992). "Isolation and characterization of the β-ketoacyl-acyl carrier protein synthase III gene (fabH) from Escherichia coli K-12". J. Biol. Chem. 267 (10): 6807–14. doi:10.1016/S0021-9258(19)50498-7. PMID 1551888. Rangan VS, Smith S (1997). "Alteration of the substrate specificity of the malonyl-CoA/acetyl-CoA:acyl carrier protein S-acyltransferase domain of the multifunctional fatty acid synthase by mutation of a single arginine residue". J. Biol. Chem. 272 (18): 11975–8. doi:10.1074/jbc.272.18.11975. PMID 9115261.
At the age of 16, Tolkien met Edith Mary Bratt, who was three years his senior, when he and his brother Hilary moved into the boarding house where she lived in Duchess Road, Edgbaston. According to Humphrey Carpenter, "Edith and Ronald took to frequenting Birmingham teashops, especially one which had a balcony overlooking the pavement. There they would sit and throw sugarlumps into the hats of passers-by, moving to the next table when the sugar bowl was empty. ... With two people of their personalities and in their position, romance was bound to flourish. Both were orphans in need of affection, and they found that they could give it to each other. During the summer of 1909, they decided that they were in love." His guardian, Father Morgan, considered it "altogether unfortunate" that his surrogate son was romantically involved with an older, Protestant woman; Tolkien wrote that the combined tensions contributed to his having "muffed [his] exams". Morgan prohibited him from meeting, talking to, or even corresponding with Edith until he was 21. Tolkien obeyed this prohibition to the letter, with one notable early exception, over which Father Morgan threatened to cut short his university career if he did not stop. On the evening of his 21st birthday Tolkien wrote to Edith, who was living with a family friend named C. H. Jessop in Cheltenham. He declared that he had never ceased to love her, and asked her to marry him. Edith replied that she had already accepted the proposal of George Field, the brother of one of her closest school friends.
It is assumed that the transection of white substance of the frontal lobes impairs their connection with the thalamus and eliminates the possibility of receiving from it stimuli which lead to irritation and, on the whole, derange mental functions. This explanation is mechanistic and goes back to the narrow localizationism characteristic of American psychiatrists, from where leucotomy was imported to us. The Soviet Union officially banned the procedure in 1950 on the initiative of Gilyarovsky. Doctors in the Soviet Union concluded that the procedure was "contrary to the principles of humanity" and "'through lobotomy' an insane person is changed into an idiot". By the 1970s, numerous countries had banned the procedure, as had several US states. In 1977 after the National Research Act created the National Commission for the Protection of Human Subjects of Biomedical and Behavioral Research, the Commission investigated allegations that psychosurgery – including lobotomy techniques – were used to control minorities and restrain individual rights. Its published report did not recommend a ban on psychosurgery, but noted that the risks to patients from psychosurgery and its potential abuse required strong safeguards. Torsten Wiesel has called the award of the Nobel Prize to Moniz an "astounding [error] of judgment ... a terrible mistake", and there have been calls for the Nobel Foundation to rescind the award.
Sources: en.wikipedia.org
=== Middle Ages === After the fall of the Western Roman Empire, the town, along with the rest of the Italian peninsula, was conquered by the Heruli and the Ostrogoths, recaptured by the Romans, but then conquered again by the Lombards whose territory then fell into the hands of the Franks under Charlemagne (773). The Contea di Torino (countship) was founded in the 940s and was held by the Arduinic dynasty until 1050. After the marriage of Adelaide of Susa with Humbert Biancamano's son Otto, the family of the Counts of Savoy gained control. While the title of count was held by the Bishop as count of Turin (1092–1130 and 1136–1191) it was ruled as a prince-bishopric by the Bishops. In 1230–1235, it was a lordship under the Marquess of Montferrat, styled Lord of Turin. At the end of the 13th century, when it was annexed to the Duchy of Savoy, the city already had 20,000 inhabitants. Many of the gardens and palaces were built in the 15th century when the city was redesigned. The University of Turin was also founded during this period.
=== 20 December === President Putin stated that the situation was "extremely difficult" in the four areas of Russia-annexed Ukraine. Putin ordered the Federal Security Services to step up surveillance at the country's borders to combat "emergence of new threats" from abroad and traitors. President Zelenskyy visited the Bakhmut region. Russian energy exporter Gazprom said that despite a fatal explosion at the Urengoy–Pomary–Uzhhorod pipeline they were able to supply gas to their customers using parallel pipelines without any shortages.
=== Hair loss disorder === The first LLLT (low-level laser device) device (at a wavelength of 635 nm) for androgenetic alopecia was approved by the FDA two decades ago. The FDA then approved a similar device (at a wavelength of 655 nm) for alopecia two years later, in 2009. Low-level laser therapy (LLLT) is the traditional FDA-approved therapy for hair loss disorders, while LEDT has become a more advanced treatment due to its safety and efficacy. The commonly used wavelengths targeting hair loss disorder are red and infrared. In-vivo studies show that the red-light LEDT at the wavelength of 655 nm contributes to dramatic improvements in the hair counts of androgenetic alopecia patients. A more recent study indicates a similar therapeutic effect of yellow-light LEDT on androgenetic alopecia and alopecia areata patients.
This combined testing of OQ and PQ phases is sanctioned by the European Commission Enterprise Directorate-General within ‘Annex 15 to the EU Guide to Good Manufacturing Practice guide’ (2001, p. 6) which states that:
Sources: en.wikipedia.org
No. It is a laboratory-synthesized analog built on a fragment of the natural hormone. The natural peptide is shorter-lived and lacks the stabilizing substitutions found in the synthetic version.
DAC stands for drug affinity complex, a chemical group that binds the peptide to serum albumin. The binding slows clearance and lengthens the time the molecule stays in plasma compared with the unmodified analog.
Because two distinct molecules are discussed under one informal label. The albumin-binding version clears over several days, while the form without that group clears within roughly half an hour. Mixing results from both creates inconsistent figures.
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.