This is a working overview of somatotroph, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-01-30 and is reviewed periodically as new material appears.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C152H252N44O42 | Cited for the form without the drug affinity complex |
| Molecular weight | About 3368 Da | Reported value for modified GRF(1-29) |
| Appearance | White to off-white powder | Lyophilised solid as usually supplied |
| Solubility | Soluble in water and polar solvents | Clarity depends on purity and salt content |
| Typical storage | -20 C or below, dry | Protect from light and repeated warming cycles |
Reconstitution is typically performed with sterile water or bacteriostatic water, added slowly against the vial wall. The resulting solution should be clear and colorless; cloudiness or visible particles suggest a problem with the material or the diluent. Once in solution, the peptide is less stable than the dry powder. Refrigerated storage at two to eight degrees Celsius is common for short-term holding, while freezing aliquots is described for longer periods.
Purity is most often assessed by reversed-phase high-performance liquid chromatography, reported as a percentage of total peak area. Identity is confirmed by mass spectrometry, which yields a molecular ion consistent with the expected sequence. Amino acid analysis and peptide mapping provide additional characterization. Reported purity values are method-dependent, so figures from different laboratories are not always directly comparable without details of column, gradient, and detection wavelength.
At the pituitary, the peptide binds the growth hormone-releasing hormone receptor on somatotroph cells. Receptor activation raises intracellular cyclic AMP and triggers release of stored growth hormone. Somatostatin and other hypothalamic signals modulate this response. Negative feedback from insulin-like growth factor 1 also influences output. The same regulatory architecture operates with the native hormone. Whether the synthetic analog alters feedback dynamics over repeated exposure remains an open question. Most published receptor work uses cell models rather than intact human systems.
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.
Based on animal research, it was initially thought that bicalutamide was unable to cross the blood–brain barrier into the central nervous system and hence would be a peripherally-selective antiandrogen in humans. This conclusion was drawn from the finding that bicalutamide reportedly does not increase LH or testosterone levels in multiple tested animal species, including rats and dogs. AR antagonists like flutamide normally do this by blocking ARs in the pituitary gland and hypothalamus in the brain and thereby disinhibiting the HPG axis. The notion that bicalutamide does not cross the blood–brain barrier is in accordance with rodent tissue distribution studies, which have found low levels of bicalutamide in the hypothalamus and cerebral cortex relative to most peripheral tissues and the pituitary gland (a part of the brain that is outside of the blood–brain barrier). In spite of the preceding studies however, other rodent studies have contradicted these results and found that bicalutamide does significantly and dose-dependently increase LH and testosterone levels, and in some studies to a similar extent as flutamide. In any case, in humans, bicalutamide has consistently been found to increase LH and testosterone levels, and to a comparable extent relative to flutamide and nilutamide. This occurs to a significant extent at even a very low dosage of 10 mg/day bicalutamide.
== External links == Media related to Counterfeit medications at Wikimedia Commons "Fake Prescription Pills". Drug Enforcement Administration (DEA). "Misuse of Prescription, Opioids, and Fake Pills". www.samhsa.gov. June 6, 2023.
== Sublethal effects == When an insect population is exposed to pesticide concentrations that are sublethal, surviving individuals may experience a variety of sublethal effects (symptoms). These effects can influence its biology, behavior, and long-term population dynamics. Documented sublethal responses include reduced or increased reproductive capacity, shortened or lengthened lifespan, altered developmental timing or deformities, disrupted feeding activity, and changes in foraging or movement patterns. Over time, these physiological and behavioral changes can slow population growth, disrupt ecological interactions, or in some cases, lead to compensatory increases in reproduction as a stress response. Sublethal exposure can lead to pesticide resistance. Insects that survive may carry genetic traits that enable tolerance, and when these individuals reproduce, resistance can spread through the population and result in decreased long-term pesticide effectiveness. Understanding sublethal effects is critical for integrated pest management strategies and for evaluating the ecological risk of pesticide use in agricultural and natural ecosystems.
== External links == "Apitegromab ( Code - C174923 )". EVS Explore. Clinical trial number NCT05156320 for "Efficacy and Safety of Apitegromab in Patients With Later-Onset Spinal Muscular Atrophy Treated With Nusinersen or Risdiplam (SAPPHIRE)" at ClinicalTrials.gov
All of the lower respiratory tract including the trachea, bronchi, and bronchioles is lined with respiratory epithelium. This is a ciliated epithelium interspersed with goblet cells which produce mucin the main component of mucus, ciliated cells, basal cells, and in the terminal bronchioles–club cells with actions similar to basal cells, and macrophages. The epithelial cells, and the submucosal glands throughout the respiratory tract secrete airway surface liquid (ASL), the composition of which is tightly regulated and determines how well mucociliary clearance works. Pulmonary neuroendocrine cells are found throughout the respiratory epithelium including the alveolar epithelium, though they only account for around 0.5 percent of the total epithelial population. PNECs are innervated airway epithelial cells that are particularly focused at airway junction points. These cells can produce serotonin, dopamine, and norepinephrine, as well as polypeptide products. Cytoplasmic processes from the pulmonary neuroendocrine cells extend into the airway lumen where they may sense the composition of inspired gas.
Sources: en.wikipedia.org
Stainless steel remains a piping material of choice for the pharmaceutical industry. Due to its metallic contribution, most steel was removed from microelectronics UPW systems in the 1980s and replaced with high performance polymers of polyvinylidene fluoride (PVDF), perfluoroalkoxy (PFA), ethylene chlorotrifluoroethylene (ECTFE) and polytetrafluoroethylene (PTFE) in the US and Europe. In Asia, polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC) and polypropylene (PP) are popular, along with the high performance polymers.
A fifth vector is acknowledged to have occurred on 30 May 2007 FDA/USDA press conference, whereby U.S. manufacturers of livestock and shrimp/fish feed have acknowledged adding melamine to their products as a binder. The original Xuzhou Anying wheat gluten was "human grade," as opposed to "feed grade," meaning that it could have been used to make food for humans such as bread or pasta. At least one contaminated batch was used to make food for humans, but the FDA quarantined it before any was sold. The FDA also notified the Centers for Disease Control and Prevention to watch for new patients admitted to hospitals with renal failure. As of April 2007, there were no observed increases in human illnesses, and little human food tested as contaminated. Reports of widespread melamine adulteration in Chinese animal feed have raised the possibility of wider melamine contamination in the human food supply in China and abroad. Despite the widely reported ban on melamine use in vegetable proteins in China, at least some chemical manufacturers continue to report selling it for use in animal feed and in products for human consumption. Said Li Xiuping, a manager at Henan Xinxiang Huaxing Chemical in Henan Province: "Our chemical products are mostly used for additives, not for animal feed.
In anatomy, the epidural space is the potential space between the dura mater and vertebrae (spine). The anatomy term "epidural space" has its origin in the Ancient Greek language; ἐπί, "on, upon" + dura mater also known as "epidural cavity", "extradural space" or "peridural space". In humans the epidural space contains lymphatics, spinal nerve roots, loose connective tissue, adipose tissue, small arteries, dural venous sinuses and a network of internal vertebral venous plexuses.
=== Medical === Odontostomatology: gingivitis, stomatitis, glossitis, aphthous ulcers, dental surgery and oral ulceration due to radiation therapy. Otorhinolaryngology: glandular fever, pharyngitis, tonsillitis, post-tonsillectomy, radiation or intubation mucositis. It may be used alone or as an adjunct to other therapy giving the possibility of increased therapeutic effect with little risk of interaction. In some markets, the drug is supplied as an over-the-counter cream (Lonol in Mexico from Boehringer Ingelheim) used for topical treatment of musculoskeletal system disorders: sprains, strains, bursitis, tendinitis, synovitis, myalgia, periarthritis.
== Toxicity == Studies carried out on the toxicity of convulxin show that symptoms are a function of the dose. The effects of the toxin stand out through the sudden and brief duration of the symptoms after exposure. In mice, low doses (5 μg/animal) administered intravenously (I.V) elicited tachypnea, followed by apnea, within 20 seconds. The ED50 for brief duration apnea was determined to be 180 μg/kg. Higher doses (10 μg/animal) evoked intense convulsive crisis, and usually ended with the death of the animal. LD50 was determined to be 524 μg/kg. Intraperitoneal (I.P.) administration of up to 200 μg/animal proved to be ineffective. In cats, I.V. injections of 100 μg/kg showed respiratory disturbances, miosis, salivation, abdominal cramps, nystagmus, loss of equilibrium, convulsions and sometimes a brief phase of hypotonia. The ED50 dose for convulsions is 80 μg/kg. The majority of animals recovered within 30 minutes. In dogs, the effect of convulxin showed two stages. After I.V. injection of 100-125 μg/kg they became excited, barked and exhibited loss of equilibrium, respiratory disturbances, nystagmus, urination, defecation and vomiting. After recovery, two out of five animals had intermittent crisis of clonic convulsions that appeared after 24 hours and lasted until their death. The other three dogs showed periods of vivid agitation alternating with torpor. While the lethal dose in humans is not yet known, what has been discovered is that the level of toxic effects depends on the origin of the snake. As for a cure, so far a polyvalent snake antivenom is being used.
Sources: en.wikipedia.org
Lemelson-MIT Prize (2014) – known as the "Oscar for inventors", for groundbreaking inventions and dedication to the next generation of scientists. Heinz Award for Technology (2015) – for groundbreaking inventions and advocacy for women in STEM fields. Othmer Gold Medal (2019) – from the Science History Institute. Several honorary doctorate degrees, including from the Icahn School of Medicine at Mount Sinai (2021), University of London Institute Cancer Research (2019), and Utrecht University in the Netherlands (2017). Bhatia has also been honored with:
This is considered an argument for the opposite effects of tianeptine and fluoxetine on serotonin uptake, although it has been shown that fluoxetine can be partially substituted for tianeptine in animal studies. In any case, the collective research suggests that direct modulation of the serotonin system is unlikely to be the mechanism of action underlying the antidepressant effects of tianeptine.
The first document, which was leaked at the end of January, was a "draft version of the Progressive Conservative government's upcoming health-care transformation legislation." CTV News said "local health integration networks, Cancer Care Ontario, eHealth Ontario, the Trillium Gift of Life Network and other government health agencies" would be "rolled into" the super agency. Minister Elliot said that the December 13 assistant deputy ministers workshop document, which made references to outsourcing laboratories, "inspections, licensing, devices" and Ornge, were options and that these services would not be privatized. The NDP said that the super agency was described in the leaked documents as having the "competency and capacity to effectively partner with public and private sector entities." The documents show that MyCare groups is being created as a "new model" of "integrated care delivery" with the goal of providing "patients with seamless, co-ordinated care and a single team of providers for all their care needs." Ontario Health Minister Christine Elliot tabled the controversial Bill 74: The People's Health Care Act. Its first reading was on February 26, 2019, and it received Royal Assent on April 18, 2019.
=== Pressure reduction === Pressure must be removed from high risk body areas by frequent changes in position in bed or chair, including turning side to side. Chair cushions and air mattresses should be used for immobile patients. Heels should be off of the bed.
== Invertebrates == It is less common to find examples of dedifferentiation (due to a lack of regenerative ability) in most invertebrates. This brief example outlines dedifferentiation in an invertebrate species, and interestingly involves the Msx pathway, as detailed above in the mechanisms section.
Sources: en.wikipedia.org
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.
No regulatory agency has approved CJC-1295 for clinical use. Human trials were conducted in the 2000s, but the development programme was discontinued before any marketing application succeeded. Material sold today is offered as a research chemical, and its purity depends on the supplier.
Sermorelin is an unmodified fragment of growth hormone-releasing hormone and is cleared quickly. CJC-1295 contains substitutions that resist breakdown, and the form with a drug affinity complex persists much longer. Both act at the same receptor but differ substantially in duration of action.
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.