A practical reference on GHRH receptor: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-04-26. Anything still debated is marked as such rather than presented as settled.
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.
CJC-1295 acts at the growth hormone-releasing hormone receptor, a G-protein-coupled receptor found on somatotroph cells in the anterior pituitary. Binding triggers a rise in cyclic AMP and calcium entry, which promotes release of stored growth hormone. Because the peptide mimics the body's own releasing hormone, it amplifies existing secretory pulses rather than driving continuous output. The size of the response therefore depends partly on the subject's own hormonal rhythm and feedback state.
CJC-1295 is a synthetic analogue of growth hormone-releasing hormone, built on the 29-amino-acid GHRH(1-29) fragment. Four substitutions distinguish it from the natural sequence: D-alanine at position 2, glutamine at position 8, alanine at position 15, and leucine at position 27. These changes reduce enzymatic cleavage and extend the peptide's persistence in circulation. The compound is discussed in two forms, one carrying a drug affinity complex and one without it.
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 |
|---|---|---|
| Primary target | GHRH receptor | G-protein-coupled receptor on pituitary somatotrophs |
| Half-life, long-acting form | Several days | Extended by covalent albumin binding |
| Half-life, short form | About 30 minutes | Cleared rapidly by peptidases and kidneys |
| Route in studies | Subcutaneous injection | Used in the published human trials |
| Main measured effect | Rise in GH and IGF-1 | Surrogate markers rather than clinical endpoints |
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.
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.
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.
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.
==== Black or African American ==== As of 2023, the obesity rate for Black adults age 20 years and older was 42.9%. For adult Black men in 2018, the rate of obesity was 31.2%. For adult Black women, the rate of obesity was 44.3%.
== History == Modern two-dimensional chromatographic techniques are based on the results of the early developments of paper chromatography and thin-layer chromatography (TLC) which involved liquid mobile phases and solid stationary phases. These techniques would later generate modern gas chromatography (GC) and liquid chromatography (LC) analysis. Different combinations of one-dimensional GC and LC produced the analytical chromatographic technique that is known as two-dimensional chromatography. The earliest form of 2D-chromatography came in the form of a multi-step TLC separation in which a thin sheet of cellulose is used first with one solvent in one direction, then, after the paper has been dried, another solvent is run in a direction at right angles to the first. This methodology first appeared in the literature with a 1944 publication by A. J. P. Martin and coworkers detailing an efficient method for separating amino acids – "...but the two-dimensional chromatogram is especially convenient, in that it shows at a glance information that can be gained otherwise only as the result of numerous experiments" (Biochem J., 1944, 38, 224).
== Parenteral formulations == These are also called injectable formulations and are used with intravenous, subcutaneous, intramuscular, and intra-articular administration. The drug is stored in liquid or if unstable, lyophilized form. Many parenteral formulations are unstable at higher temperatures and require storage at refrigerated or sometimes frozen conditions. The logistics process of delivering these drugs to the patient is called the cold chain. The cold chain can interfere with delivery of drugs, especially vaccines, to communities where electricity is unpredictable or nonexistent. NGOs like the Gates Foundation are actively working to find solutions. These may include lyophilized formulations which are easier to stabilize at room temperature. Most protein formulations are parenteral due to the fragile nature of the molecule which would be destroyed by enteric administration. Proteins have tertiary and quaternary structures that can be degraded or aggregated at room temperature. This can impact the safety and efficacy of the medicine.
Sources: en.wikipedia.org
==== Dementia ==== Several studies have drawn an association between long-term benzodiazepine use and neurodegenerative disease, particularly Alzheimer's disease. It has been determined that long-term use of benzodiazepines is associated with increased dementia risk, even after controlling for protopathic bias. In contrast, a clinical study using florbetapir PET-CT and MRI to compute beta-amyloid load and hippocampal volume, respectively, found benzodiazepines to be associated with decreased beta-amyloid load and reduced hippocampal atrophy in a cohort of older nondemented adults with isolated/light cognitive impairments. Unlike previous imaging studies limited to MRI techniques, the utilization of a dual PET CT scanner to track the binding of the radioligand florbetapir to beta-amyloid provides stronger neuroimaging data with respect to alzheimer's related pathophysiology. Indeed, Avid's florbetapir PET technique has received FDA approval for diagnosing alzheimer's disease. Drug Approval Package Archived 10 June 2025 at the Wayback Machine However, there is still no causal evidence regarding how benzodiazepines affect the risk of alzheimer's disease or dementia.
== January 2, 1982 (Saturday) == The Army of Guatemala, in a campaign by President Fernando Lucas Garcia, killed 35 civilians in the village of Pichec, in the Baja Verapaz Department near Rabinal, for their support of the Guerrilla Army of the Poor (Ejército Guerrillero de los Pobres). The killing was the third of the mostly Maya residents of Pichec, in less than nine weeks, with 32 men killed on November 1 and 30 more on November 22. Ahmad Fuad Mohieddin was selected to become the new Prime Minister of Egypt at the request of President Hosni Mubarak, who had held the position of both president and premier since the October 6 assassination of Anwar Sadat. In Denmark, the popular television series Matador broadcast its final episode, watched by 3.5 million viewers in a nation of 5.1 million people. The Clemson University Tigers football team finished in first place in both polls recognized by the NCAA for determining the U.S. major university football championship. In the AP poll of 49 sportswriters, Clemson received 977 points (based on 20 points for a first place vote, 19 for second place, etc.) and the Texas Longhorns 862 points. In the UPI poll of 37 coaches, Clemson had 547 points and the Pitt Panthers 472. In an NFL playoff game nicknamed the "Epic in Miami" as well as "The Game No One Should Have Lost", and ranked in a 2020 survey as the fourth greatest NFL game in the 20th century, the San Diego Chargers defeated the Miami Dolphins, 41 to 38, in overtime, after blowing a 24 to 0 lead in the first quarter.
The right to freedom of speech and association is guaranteed by Article 14(1) of the Constitution of Singapore, although there are provisions in the subsequent subsection that regulate them. The government has restricted freedom of speech and freedom of the press as well as some civil and political rights. In 2023, Singapore was ranked 129th out of 180 nations by Reporters Without Borders on the global Press Freedom Index. Freedom House ranks Singapore as "partly free" in its Freedom in the World report, and the Economist Intelligence Unit ranks Singapore as a "flawed democracy", the second freest rank of four, in its "Democracy Index". All public gatherings of five or more people require police permits, and protests may legally be held only at the Speakers' Corner. In the Corruption Perceptions Index, which ranks countries by "perceived levels of public sector corruption", Singapore has consistently ranked as one of the least corrupt countries in the world, in spite of being illiberal. Singapore's unique combination of a strong, soft-authoritarian government with an emphasis on meritocracy is known as the "Singapore model", and is regarded as a key factor behind Singapore's political stability, economic growth, and harmonious social order. In 2021, the World Justice Project's Rule of Law Index ranked Singapore as 17th overall among the world's 193 countries for adherence to the rule of law.
Sources: en.wikipedia.org
Prognosis varies with the type of amyloidosis and the affected organ system. Prognosis for untreated AL cardiac amyloidosis is poor, with a median survival of six months. More specifically, AL amyloidosis can be classified as stage I, II or III based on cardiac biomarkers like Nt-proBNP and cardiac troponin. Survival diminishes with increasing stage, but recent advancements in treatments have improved median survival rates for stages I, II, and III, to 91.2, 60, and 7 months respectively. Outcomes in a person with AA amyloidosis depend on the underlying disease, organ(s) affected, and correlate with the concentration of serum amyloid A protein. People with ATTR, mutant ATTR and wild-type ATTR have a better prognosis when compared to people with AL and may survive for over a decade. Survival time is not associated with gender or age, however, some measures of reduced heart function are associated with a shorter survival time. Senile systemic amyloidosis was determined to be the primary cause of death for 70% of people over 110 who have been autopsied.
=== Sentinel-node identification === The radioactive properties of 99mTc can be used to identify the predominant lymph nodes draining a cancer, such as breast cancer or melanoma. This is usually performed at the time of biopsy or resection.99mTc-labelled filtered sulfur colloid or Technetium (99mTc) tilmanocept are injected intradermally around the intended biopsy site. The general location of the sentinel node is determined with the use of a handheld scanner with a gamma-sensor probe that detects the technetium-99m–labeled tracer that was previously injected around the biopsy site. An injection of Methylene blue or isosulfan blue is done at the same time to dye any draining nodes visibly blue. An incision is then made over the area of highest radionuclide accumulation, and the sentinel node is identified within the incision by inspection; the isosulfan blue dye will usually stain any lymph nodes blue that are draining from the area around the tumor.
Afrezza, developed by Mannkind, was authorized by the FDA in June 2014 for use in adults with Type 1 and Type 2 diabetes, with a label restriction limiting its use only to those who also have asthma, active lung cancer, or chronic obstructive pulmonary disease (COPD). Rapid-acting inhaled insulin is a component of the drug-device combination solution that is used at the start of every meal. It employs technosphere technology, which appears to have a more practical delivery method and more dosing flexibility, and a new inhaled insulin formulation (2.5 m). A thumb-sized inhaler with improved dosage flexibility is used to deliver inhalable insulin. It includes powder-dissolved recombinant human insulin (fumaryl diketopiperazine). Technosphere insulin is quickly absorbed by the lung surface after inhalation. Within 12 hours of inhalation, both substances—insulin, and powder (fumaryl diketopiperazine)—are virtually eliminated from healthy people's lungs. In comparison to Exubera (8–9%), just 0.3% of inhaled insulin was still present in the lungs after 12 hours. However, since serum antibody levels have been reported to increase without substantial clinical changes, acute bronchospasm in asthmatic and COPD patients along with a significant reduction in Diffusing Lung Capacity for Carbon Monoxide, in comparison to subcutaneous insulin, have been reported with its usage, Afrezza was given FDA approval with a warning (Risk Evaluation and Mitigation Strategy).
Sources: en.wikipedia.org
It binds the growth hormone-releasing hormone receptor on pituitary somatotroph cells. Receptor activation raises cyclic AMP and promotes release of stored growth hormone granules. Because the peptide persists longer than natural releasing hormone, stimulation is prolonged rather than brief.
The drug affinity complex links the peptide to serum albumin through a covalent bond. The conjugate is too large to be filtered quickly by the kidneys and is shielded from enzymatic breakdown. This extends the apparent half-life from roughly minutes to several days.
Long-term safety and any clinical benefit are unestablished. Published human data cover small groups over limited periods and focus on hormone levels rather than health outcomes. Whether prolonged elevation of growth hormone and insulin-like growth factor 1 is beneficial or harmful is an open question.
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.