Everything below concerns GHRH receptor. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-12-06. Where a claim depends on a specific study, the study is described rather than over-claimed.
CJC-1295 is a synthetic peptide belonging to the growth hormone-releasing hormone analog family. It comprises twenty-nine amino acid residues derived from the N-terminal region of natural GHRH. The molecule incorporates several non-natural substitutions that increase resistance to enzymatic degradation. These modifications extend its activity compared with the native hormone fragment. Researchers use it to study pituitary growth hormone secretion in laboratory and clinical settings. This compound is distinct from native GHRH in its stability profile.
Two principal forms appear in the literature and in research supply. One carries a drug affinity complex, a maleimide-based group that forms a covalent bond with circulating albumin. This linkage slows clearance and produces a long-lasting elevation of peptide levels. The other form lacks that group and is often labeled MOD GRF(1-29). It has a much shorter circulation time. Both variants retain the same core receptor-binding sequence. Reported half-lives differ substantially between the two.
The compound emerged from work at a Canadian biotechnology firm in the early 2000s. Early human studies examined its effect on growth hormone and insulin-like growth factor 1 in healthy volunteers and in people with HIV-associated fat redistribution. Reports described sustained increases in both markers after a single injection. Development did not advance to regulatory approval, and the clinical programme was later discontinued. The molecule is now encountered mainly as a research chemical rather than a marketed medicine.
Two forms circulate in research settings and are frequently confused. One carries the drug affinity complex and is often written as CJC-1295 with DAC; the other lacks that group and is usually called modified GRF(1-29). The two share the same core sequence but differ sharply in how long they persist in blood. Products labelled only as CJC-1295 normally refer to the version carrying the complex. Documentation that omits the distinction leaves the intended molecule ambiguous.
CJC-1295 is a synthetic peptide built as a long-acting analogue of growth hormone-releasing hormone. Its backbone matches the first twenty-nine residues of the natural human hormone, with four amino acid substitutions added to slow enzymatic breakdown. A reactive maleimide group, commonly termed the drug affinity complex, allows the peptide to attach to circulating albumin after administration. That albumin attachment keeps the molecule in the bloodstream for an extended period instead of being cleared within minutes.
| Property | Value | Notes |
|---|---|---|
| Molecular weight, DAC form | About 3647 Da | Varies with salt form |
| Molecular weight, non-DAC form | About 3358 Da | MOD GRF(1-29) |
| Solubility class | Water soluble | Also dissolves in polar solvents |
| Reported half-life, DAC form | About five to eight days | Values from human studies |
| Common synonyms | CJC-1295; MOD GRF(1-29) | Name depends on variant |
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 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.
Peptide degradation proceeds mainly through hydrolysis, oxidation of methionine, and deamidation of asparagine or glutamine residues. The maleimide group on the albumin-binding variant can also react with thiols or hydrolyze in aqueous media. Because these pathways accelerate with temperature and pH extremes, handling conditions strongly influence measured stability. Stability data in the public literature are limited and often generated under differing conditions, so general statements about shelf life should be read as approximate.
Research material is normally supplied as a freeze-dried powder in sealed vials. In that state the peptide is comparatively robust, but prolonged exposure to warmth, moisture, or light accelerates degradation. Storage at minus twenty degrees Celsius or lower, with desiccant and protection from light, is the commonly described practice. Vials should be allowed to reach room temperature before opening to limit condensation on the powder. Moisture uptake during handling is a recognized source of variability in later measurements.
==== Differences from castration ==== It has been proposed that the increase in estrogen levels caused by NSAAs like bicalutamide compensates for androgen blockade in the brain, which may explain differences in the side effect profiles of these drugs relative to GnRH analogues/castration, combined androgen blockade, and CPA (which, in contrast, decrease both androgen and estrogen levels). In the case of sexual interest and function, this notion is supported by a variety of findings including animal studies showing that estrogen deficiency results in diminished sexual behavior, treatment with tamoxifen resulting in significantly lowered libido in 30% of men receiving it for male breast cancer, and estrogen administration restoring libido and the frequency of sexual intercourse in men with congenital estrogen deficiency, among others. Several metabolites of testosterone and DHT, including estradiol, 3α-androstanediol, and 3β-androstanediol, are estrogens (mainly potent ERβTooltip estrogen receptor beta agonists in the cases of the latter two), and 3α-androstanediol is additionally a potent GABAA receptor-potentiating neurosteroid. Due to the fact that bicalutamide does not lower testosterone levels, the levels of these metabolites would not be expected to be lowered either, unlike with therapies such as GnRH analogues.
=== Pakistan === The 2012 Pakistan fake medicine crisis revealed the scale of production of counterfeit medications in Pakistan. Over 100 heart patients died after administration of adulterated drugs by the Punjab Institute of Cardiology. Pakistan did not have any regulatory enforcement on production of medicines until this crisis occurred. In response to the crisis, a regulatory body was finally set up in February 2012.
Baritosis, a benign pneumoconiosis is associated with inhalation of dust containing barium sulfate or barium carbonate; the effects are reversible. Silver poisoning, like lithium poisoning, arises from misapplication of medications. A dramatic symptom of "argyria" is that the skin turns blue or bluish-grey. Thallium poisoning has been observed on several occasions, and it is well known that thallium compounds are highly toxic. Nonetheless, incidents of thallium poisoning are few. Tin poisoning from tin metal, its oxides, and its salts are "almost unknown"; on the other hand certain organotin compounds are almost as toxic as cyanide. Such organotin compounds were once widely used as anti-fouling agents.
==== Anabolic ==== Bone marrow stimulation: For decades, AAS were the mainstay of therapy for hypoplastic anemias due to leukemia, kidney failure or aplastic anemia. Growth stimulation: AAS can be used by pediatric endocrinologists to treat children with growth failure. However, the availability of recombinant growth hormone, which has fewer side effects, makes this a secondary treatment. Stimulation of appetite and preservation and increase of muscle mass: AAS have been given to people with chronic wasting conditions such as cancer and AIDS. Stimulation of lean body mass and prevention of bone loss in elderly men, as some studies indicate. However, a 2006 placebo-controlled trial of low-dose testosterone supplementation in elderly men with low levels of testosterone found no benefit on body composition, physical performance, insulin sensitivity, or quality of life. Prevention or treatment of osteoporosis in postmenopausal women. Nandrolone decanoate is approved for this use. Although they have been indicated for this treatment, AAS saw little use for this purpose due to their virilizing side effects. Aiding weight gain following surgery or physical trauma, during chronic infection, or in the context of unexplained weight loss. Counteracting the catabolic effect of long-term corticosteroid therapy. Oxandrolone improves both short-term and long-term outcomes in people recovering from severe burns, and is well-established as a safe treatment for this indication. Treatment of idiopathic short stature, hereditary angioedema, alcoholic hepatitis, and hypogonadism.
Sources: en.wikipedia.org
=== Availability === Cyproheptadine is available widely throughout the world. This includes in Australia, Canada, Europe, Hong Kong, India, Japan, Mexico, Turkey, the United Kingdom, and the United States, among others.
== Life and career == Aylward was born and raised in Seattle, Washington. He attended St. Joseph's Grade school and went on to Prep High School, but graduated from Garfield High School in 1965. He graduated from the Professional Actor's Training Program at the University of Washington in 1970. Beginning his acting career in Seattle, he was also one of the founders, in 1973, of Empty Space Theatre there. He worked regularly as a company member of the Seattle Repertory Theatre. He appeared in dramas by David Mamet, Arthur Miller and Tennessee Williams. Carol Flynt, co-producer of ER, first offered him an audition after seeing him in a 1996 production of Psychopathia Sexualis at the Mark Taper Forum in Los Angeles. He went on to play the recurring role of Dr. Donald Anspaugh on ER from 1996 to 2008. He also had a recurring role as former DNC chairman Barry Goodwin on The West Wing from 2005 to 2006. He also provided the voice of Dr. Arne Magnusson in the 2007 video game Half-Life 2: Episode Two. Aylward appeared in numerous television shows, including Northern Exposure, 3rd Rock from the Sun, The Practice, Law & Order and Mad Men. His film roles included Three Fugitives (1989), Teenage Mutant Ninja Turtles III (1993), Buddy (1997), Armageddon (1998), Thirteen Days (2000), and the HBO films From the Earth to the Moon (1998) and Path to War (2002). He played Father Edward Devine in the 2020 sports drama movie The Way Back. Aylward died in Seattle on May 16, 2022, at the age of 75.
After the end of World War II, Enewetak came under the control of the United States as part of the Trust Territory of the Pacific Islands, until the independence of the Marshall Islands in 1986. During its tenure, the United States evacuated the local residents many times, often involuntarily. The atoll was used for nuclear testing, as part of the Pacific Proving Grounds. Before testing commenced, the U.S. exhumed the bodies of United States servicemen killed in the Battle of Enewetak and returned them to the United States to be re-buried by their families. Forty-three nuclear tests were fired at Enewetak from 1948 to 1958. The first hydrogen bomb test, code-named Ivy Mike, occurred in late 1952 as part of Operation Ivy; it vaporized the islet of Elugelab and created two new elements: Fermium and Einsteinium. This test included B-17 Flying Fortress drones to fly through the radioactive cloud to test onboard samples. B-17 mother ships controlled the drones while flying within visual distance of them. In all, 16 to 20 B-17s took part in this operation, of which half were controlling aircraft and half were drones. To examine the explosion clouds of the nuclear bombs in 1957/58, several rockets (mostly from rockoons) were launched. One USAF airman, Jimmy Robinson, was lost at sea during the tests. Robinson's F-84 Thunderjet crashed and sank 3.5 miles (5.6 km) short of the island. Robinson's body was never recovered.
Recently, the boundaries between various specialties have blurred, as they are all influenced by basic research in neuroscience. For example, brain imaging enables objective biological insight into mental illnesses, which can lead to faster diagnosis, more accurate prognosis, and improved monitoring of patient progress over time. Integrative neuroscience describes the effort to combine models and information from multiple levels of research to develop a coherent model of the nervous system. For example, brain imaging coupled with physiological numerical models and theories of fundamental mechanisms may shed light on psychiatric disorders. Another important area of translational research is brain–computer interfaces (BCIs), or machines that are able to communicate and influence the brain. They are currently being researched for their potential to repair neural systems and restore certain cognitive functions. Translational BCI research is supported by specialized neurotechnology platforms that enable high-resolution neural signal acquisition, real-time processing, and experimental validation in clinical and laboratory settings. Such platforms are developed by academic groups as well as industry partners, including systems produced by g.tec medical engineering GmbH.
Helices observed in proteins can range from four to over forty residues long, but a typical helix contains about ten amino acids (about three turns). In general, short polypeptides do not exhibit much α-helical structure in solution, since the entropic cost associated with the folding of the polypeptide chain is not compensated for by a sufficient amount of stabilizing interactions. In general, the backbone hydrogen bonds of α-helices are considered slightly weaker than those found in β-sheets, and are readily attacked by the ambient water molecules. However, in more hydrophobic environments such as the plasma membrane, or in the presence of co-solvents such as trifluoroethanol (TFE), or isolated from solvent in the gas phase, oligopeptides readily adopt stable α-helical structure. Furthermore, crosslinks can be incorporated into peptides to conformationally stabilize helical folds. Crosslinks stabilize the helical state by entropically destabilizing the unfolded state and by removing enthalpically stabilized "decoy" folds that compete with the fully helical state. It has been shown that α-helices are more stable, robust to mutations and designable than β-strands in natural proteins, and also in artificially designed proteins.
Sources: en.wikipedia.org
It is a synthetic peptide modeled on growth hormone-releasing hormone. The molecule is used in research on pituitary growth hormone secretion. It differs from the natural hormone through several stabilizing substitutions.
The DAC form carries a maleimide group that binds albumin and extends circulation time. The non-DAC form lacks this group and clears much faster. Both share the same receptor-binding core.
It targets the growth hormone-releasing hormone receptor on pituitary somatotroph cells. Activation raises cyclic AMP and promotes growth hormone release. Normal feedback pathways remain part of the response.
It is a synthetic peptide analogue of growth hormone-releasing hormone. Four substitutions in its sequence make it more resistant to enzymatic degradation than the natural hormone. In the version carrying a drug affinity complex, the peptide binds albumin and remains in circulation for days.