Cyclic AMP is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2025-11-23. Where a claim depends on a specific study, the study is described rather than over-claimed.
Clearance profiles diverge sharply between the two versions. The albumin-binding molecule stays in plasma for several days, whereas the unmodified analog is largely gone within about half an hour in reported work. Cleavage by dipeptidyl peptidase IV is a major contributor to the short life of the unmodified sequence. These gaps mean the two versions cannot be substituted for each other in study design or in reading results side by side.
Reports on this compound commonly follow serum growth hormone and insulin-like growth factor 1 across defined time windows. Protocols differ in sampling frequency, assay platform, and participant characteristics, which makes direct comparison between publications difficult. Some work focuses on pulsatile release patterns instead of average concentrations. Whether repeated exposure alters endogenous hormone rhythms over long periods remains an open question, and the formal literature is thinner than the volume of informal commentary implies.
Once in circulation, the peptide binds the growth hormone-releasing hormone receptor displayed on pituitary somatotroph cells. Receptor activation couples to Gs proteins, elevates intracellular cyclic AMP, and drives protein kinase A signaling inside the cell. That cascade increases discharge of growth hormone into the bloodstream. The analog therefore operates through a receptor pathway that already exists for the body's own releasing hormone, rather than through an engineered artificial target.
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.
CJC-1295 is a synthetic peptide designed as a long-acting analogue of growth hormone-releasing hormone (GHRH). Its structure derives from the first 29 amino acids of native GHRH, a fragment often called GRF(1-29). Four substitutions were introduced to slow enzymatic breakdown and extend activity relative to the natural sequence. The compound was developed by ConjuChem as part of a broader effort to improve the pharmacokinetic profile of peptide hormones. It is studied in laboratory and clinical research settings rather than appearing as a naturally occurring substance.
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.
| Property | Value | Notes |
|---|---|---|
| Primary target | GHRH receptor | Present on pituitary somatotroph cells |
| Signal pathway | Gs, cyclic AMP, protein kinase A | Sequence follows receptor activation |
| Main measured effect | Growth hormone release | Insulin-like growth factor 1 shifts indirectly |
| Half-life, binding form | Several days | Extended through serum albumin association |
| Half-life, unmodified form | About 30 minutes | Limited mainly by enzymatic cleavage |
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.
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 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 second form adds a maleimide-bearing linker to the lysine at the carboxyl end. This group reacts with cysteine-34 on circulating serum albumin, forming a covalent bond that keeps the peptide in the bloodstream for far longer. ConjuChem developed the molecule as a way to extend the action of a peptide without frequent administration. The albumin attachment is the defining structural feature of the drug affinity complex version. Whether continuous exposure produces effects distinct from shorter pulses remains an unresolved research question.
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.
== Sodium-23 == Sodium-23 is the sole natural isotope of sodium, with an atomic mass of 22.98976928. Because of this, sodium-23 is used in nuclear magnetic resonance in various research fields, including materials science and battery research. Sodium-23 relaxation has applications in studying cation-biomolecule interactions, intracellular and extracellular sodium, ion transport in batteries, and quantum information processing.
=== Other maternal conditions === Thyroid problems that lead to thyroxine deficiency in the mother in weeks 8–12 of pregnancy have been postulated to produce changes in the fetal brain leading to autism. Thyroxine deficiencies can be caused by inadequate iodine in the diet, and by environmental agents that interfere with iodine uptake or act against thyroid hormones. Possible environmental agents include flavonoids in food, tobacco smoke, and most herbicides. This hypothesis has not been tested. Diabetes during pregnancy is a significant risk factor for autism. Gestational diabetes doubles the risk that the baby will have autism. The mechanism by which this happens is unknown. Maternal diagnoses of polycystic ovary syndrome was found to associated with higher risk of autism. Maternal obesity during pregnancy may also increase the risk of autism, although further study is needed. Maternal malnutrition during preconception and pregnancy influences fetal neurodevelopment. Intrauterine growth restriction is associated with autism, in both term and preterm infants.
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=== Cardiovascular diseases === In a 2022 update of an earlier report, the United States Preventive Services Task Force recommended against the use of vitamin E supplements for the prevention of cardiovascular disease or cancer, concluding there was insufficient evidence to assess the balance of benefits and harms, yet also concluding with moderate certainty that there is no net benefit of supplementation. Research on the effects of vitamin E on cardiovascular disease has produced conflicting results. In theory, oxidative modification of LDL-cholesterol promotes blockages in coronary arteries that lead to atherosclerosis and heart attacks, so vitamin E functioning as an antioxidant would reduce oxidized cholesterol and lower risk of cardiovascular disease. Vitamin E status has also been implicated in the maintenance of normal endothelial cell function of cells lining the inner surface of arteries, anti-inflammatory activity and inhibition of platelet adhesion and aggregation. An inverse relation has been observed between coronary heart disease and the consumption of foods high in vitamin E, and also higher serum concentration of alpha-tocopherol. The problem with observational studies is that these cannot confirm a relation between the lower risk of coronary heart disease and vitamin E consumption diets higher in vitamin E may also be higher in other, unidentified components that promote heart health, or lower in diet components detrimental to heart health, or people choosing such diets may be making other healthy lifestyle choices.
Eleanor Elizabeth Phillips, Personal Secretary to the Archbishop of Canterbury. For services to the Church of England. Frank Joseph Phillips. For services to the St. John Ambulance Brigade in Wiltshire. Kathleen Patricia Anne Phillips, Management Pay Band 1, the Employment Service, Department for Education and Employment. Lilian Jane Helen Phillips, . For services to the community in Worthing and West Sussex. Jessica Winifred Pickering. For services to Foster Care in Lincolnshire. Anne Doreen Piercy, District Nurse, Tring, Hertfordshire. For services to Health Care. John Neilson Pirrit, Senior Planning Officer, Inverclyde Council. For services to Local Government. Margaret Charlotte Plenderleith, Secretary, Committee of the Benevolent Fund for Nurses in Scotland. For services to the British Red Cross Society. John Plummer, lately Senior Messenger, Lord Chancellor's Department. Shirley Dorothy Polley, School Crossing Patrol Officer, Surrey County Council. For services to Road Safety. Muir John Potter. For services to disabled people in West Sussex and for humanitarian services in Romania. Ruby Margaret Pountney. For services to the Citizens' Advice Bureau in Solihull, West Midlands. Jean Powell Powell, Pre-Production Engineer (Design Support), ML Lifeguard Equipment Ltd. For services to the Survival Equipment Industry. Derek Edward Dowling Prentis. For services to the Royal British Legion in London. Mo Price. For services to the community in Stafford. Terence Pryor, Management Pay Band 1, the Employment Service, Department for Education and Employment. Peggy Pugh.
Sources: en.wikipedia.org
Among the known sons of Naram-Sin were his successor Shar-Kali-Sharri, Nabi-Ulmaš, who was governor of Tutub, and a Ukin-Ulmash. Excavations at Tell Mozan (ancient Urkesh) brought to light a sealing of Tar'am-Agade, a previously unknown daughter of Naram-Sin, who was possibly married to an unidentified endan (ruler) of Urkesh. A recently found cylinder seal, looted from Urasagrig, shows that the governor there, Sharatigubishin, was also a son. Other known children include Enmenana the "zirru priestess of the god Nanna, spouse of the god N[anna], entu priestess of the god Sin at Ur", Šumšani ēntum-priestess of Shamash at Sippar, a son who was governor at Marad, an unnamed daughter who was ēntum-priestesses at Nippur, Bin-kali-šarrē, Lipit-ilē (governor at Marad), Rigmuš-ālsu, Me-Ulmaš, and Ukēn-Ulmaš and a granddaughter Lipus-ia-um who was known to have been a lyre player for the god Sin. One daughter, Tuṭṭanabšum (Tudanapšum), held the position of high priestess of Enlil at Nippur, the most important religious position in the empire. She was also deified, the only female and only non-king to be made a god.
West Yorkshire is ethnically diverse, hosting large populations of multiple ethnic minority groups. Most notably, the city of Bradford is well known for its large concentration of British Pakistanis, the highest by percentage in the country. Leeds and Kirklees also have large British Pakistani populations. Kirklees also hosts a large population of British Indians. West Yorkshire is home to a large Eastern European population, particularly British Poles. Ethnic minorities totalled to over 21% of West Yorkshire's population in 2011.
== External links == alpha-Fetoproteins at the U.S. National Library of Medicine Medical Subject Headings (MeSH) Overview of all the structural information available in the PDB for UniProt: P02771 (Alpha-fetoprotein) at the PDBe-KB.
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Sources: en.wikipedia.org
It acts on the growth hormone-releasing hormone receptor found on pituitary somatotroph cells. Activation of that receptor triggers growth hormone release through a cyclic AMP dependent pathway.
It links the peptide to serum albumin after administration, which delays removal from circulation. Reported half-life shifts from roughly half an hour to several days as a result.
Most published work tracks serum growth hormone and insulin-like growth factor 1 over time. Sampling schedules and assay methods vary enough that figures are not directly comparable across reports.
No. It is a synthetic analogue modeled on the first 29 residues of human GHRH. The substitutions and any linker are laboratory modifications rather than features of the endogenous peptide.