A practical reference on GHRH receptor: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-08-27 and is reviewed periodically as new material appears.
Naming in this area is inconsistent, and readers should treat product labels with care. In much of the literature and in vendor catalogs, the unqualified term refers to the albumin-binding version, while the version lacking the DAC group appears as modified GRF(1-29), mod GRF(1-29), or the same name with a without-DAC qualifier. Because one abbreviation has been applied to both materials, the only reliable way to identify a sample is to check the stated sequence and the presence of the linker.
CJC-1295 is the name used for a synthetic peptide modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. The compound was described by a Canadian drug discovery company in the mid-2000s as a long-acting research tool. Two closely related molecules share the name in practice: one carries a drug affinity complex, or DAC, group, and one does not. The distinction matters because the two behave differently in circulation.
The peptide backbone corresponds to GRF(1-29), the first 29 residues of native growth hormone-releasing hormone, which retains most of the receptor-activating activity of the full-length molecule. Four substitutions distinguish the analog from the natural sequence: D-alanine at position 2, glutamine at position 8, alanine at position 15, and leucine at position 27. These changes slow cleavage by dipeptidyl peptidase IV, the enzyme that degrades native hormone in plasma within minutes. The outcome is improved enzymatic stability combined with a still brief residence time when no additional modification is present.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic peptide | GHRH analog, not a steroid |
| Backbone length | 29 amino acids | Based on GRF(1-29) |
| Substitutions | Four positions | D-Ala2, Gln8, Ala15, Leu27 |
| Appearance | White to off-white powder | Typical lyophilized research material |
| Common synonyms | Modified GRF(1-29) | Usage varies between sources |
Lyophilized material is typically stored at minus twenty degrees Celsius or lower. Keeping the vial dry and protected from light preserves peptide integrity. Repeated freeze-thaw cycles can cause aggregation or loss of activity. Once dissolved, solutions are generally kept at two to eight degrees Celsius. Stability data for reconstituted solutions vary, and long-term behavior is not fully established. Working aliquots reduce the number of times a stock container is opened.
Reverse-phase high-performance liquid chromatography is the standard tool for purity assessment. The technique separates the target peptide from truncated or modified byproducts. Mass spectrometry confirms molecular weight and supports sequence verification. Electrospray ionization and matrix-assisted laser desorption are both used. Amino acid analysis provides an independent check on composition. Purity values are commonly reported as area percentage from the chromatogram. Residual trifluoroacetate and water content are also measured in many quality programs.
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.
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.
Silencing systemin did not affect the ability of black nightshade to resist herbivory and, when competing against normal plants, silenced plants produced more above-ground biomass and berries. Upon herbivory, systemin was down-regulated in black nightshade in contrast to the other peptides which are up-regulated after herbivory. By contrast HypSys were up-regulated and activated the synthesis of protease inhibitors. The down-regulation of systemin was associated with increased root mass but did not decrease shoot mass, demonstrating that systemin can cause developmental changes as a result of herbivory, allowing the plant to tolerate, rather than directly resist attack. Tomato roots were also affected by tomato systemin, with root growth increasing at high tomato systemin concentrations. By allocating more resources to the roots, plants under attack are thought to store carbon and then use it to re-grow when the attack ends. Overexpressing AtPEP1 also increased root and shoot biomass in A. thaliana.
Thus, the diocese was essentially divided into two parts, with the mainland patriarchate of Aquileia under the protection of the Lombards, and the insular patriarchate of Aquileia seated in Grado being protected by the exarchate of Ravenna and later the Doges of Venice, with the collusion of the Lombards. The line of the patriarchs elected in Aquileia would continue in schism until 699. However, although they kept the title of patriarch of Aquileia, they moved their residence first to Cormons and later to Cividale.
=== Non-specific detection: real-time PCR with double-stranded DNA-binding dyes as reporters === A DNA-binding dye binds to all double-stranded (ds) DNA in PCR, increasing the fluorescence quantum yield of the dye. An increase in DNA product during PCR therefore leads to an increase in fluorescence intensity measured at each cycle. However, dsDNA dyes such as SYBR Green will bind to all dsDNA PCR products, including nonspecific PCR products (such as primer dimer). This can potentially interfere with, or prevent, accurate monitoring of the intended target sequence. In real-time PCR with dsDNA dyes the reaction is prepared as usual, with the addition of fluorescent dsDNA dye. Then the reaction is run in a real-time PCR instrument, and after each cycle, the intensity of fluorescence is measured with a detector; the dye only fluoresces when bound to the dsDNA (i.e., the PCR product). This method has the advantage of only needing a pair of primers to carry out the amplification, which keeps costs down; multiple target sequences can be monitored in a tube by using different types of dyes.
== History == The American professional wrestling promotion WWE (formerly World Wrestling Federation, or WWF) has been broadcasting pay-per-view (PPV) events since the mid 1980s, when its classic "Big Four" events (Royal Rumble, WrestleMania, SummerSlam, and Survivor Series) were first established between 1985 and 1989—with the company's very first PPV being WrestleMania in 1985. The company's PPV lineup expanded to a monthly basis in 1995 following the introduction of the In Your House series of pay-per views (which were replaced by standalone ppvs in 1999) before expanding even further in the mid-2000s during the first WWE brand extension. In addition, WWE produced international PPVs not available in the United States between 1997 and 2003. In 2022, the company began recognizing Money in the Bank as one of their five biggest events of the year, thus making it a "Big Five" event along with the classic "Big Four"; King of the Ring was considered a "Big Five" event from 1993 until 2002, after which, it was discontinued as a PPV until 2024. Following WWE's original brand extension in 2002, the company promoted two touring rosters, Raw and SmackDown, representing its television programs, Raw and SmackDown, with the two United Kingdom PPVs held that year being the first ones to be brand exclusive. Following Judgment Day in 2003, brand-exclusive PPVs were expanded to all WWE PPVs, except the traditional "Big Four", which continued to showcase the entire roster, while the remaining PPVs alternated between Raw and SmackDown.
Sources: en.wikipedia.org
=== Role in fetal lung === In the fetal lung, they are frequently located at the branching points of airway tubules, and in humans are present by 10 weeks gestation. Peptides and amines released by PNEC are involved in normal fetal lung development including branching morphogenesis. The best-characterized peptides are GRP, the mammalian form of bombesin, and CGRP; these substances exert direct mitogenic effects on epithelial cells and exhibit many properties akin to growth factors.
Amelio introduced benchmarking to evaluate productivity, restructured marketing strategies and reorganised management by introducing modern management practices and workplace environments. Amelio divided products into two divisions: Standard Products Group which comprised low-margin, logic and memory chips—commodity products which were more susceptible to cyclical demands and through which National Semiconductor had matured; and Communications & Computing Group which comprised high-margin, value-added analog and mixed-signal chips. Amelio's division of products seemed to prepare National Semiconductor for the eventual disposal of low-margin commodity products, which came to fruition later with the sale of a reconstituted Fairchild. National Semiconductor under Amelio chose to build a brand new eight-inch (200 mm) wafer fabrication plant in South Portland, Maine. It chose to divest itself of its then somewhat new plant in Migdal HaEmek, Israel, which became Tower Semiconductor. In 1995, Amelio was elected as the chairman of the board of directors of National Semiconductor. In 1996, Amelio accepted an invitation from Apple Computer, a customer of National Semiconductor, to join its board of directors. Troubles at Apple later prompted the board to invite Amelio to take on the position of CEO, which he accepted in February 1996. National Semiconductor announced the resignation of Amelio as the company's president, chairman and chief executive officer on February 2, 1996.
Chronic cholestasis is a feature in primary sclerosing cholangitis (PSC). PSC is a rare and progressive cholestatic liver disease characterized by narrowing, fibrosis, and inflammation of intrahepatic or extrahepatic bile ducts, leading to reduced bile flow or formation (i.e., cholestasis). The pathogenesis of PSC remains unclear but probably involves a combination of environmental factors and genetic predisposition. Notably, 70-80% of patients with PSC are comorbid with inflammatory bowel disease (e.g., ulcerative colitis or Crohn's colitis), suggesting there exists a link between the two. PSC predominantly affects males (60–70%) of 30–40 years of age. The disease has an incidence is 0.4–2.0 cases/100,000 and a prevalence of 16.2 cases/100,000, making it a rare disease. Nonetheless, PSC accounts for 6% of liver transplants in the US due to its eventual progression to end-stage liver disease, with a mean transplant-free survival of 21.3 year. Though 40-50% of patients are asymptomatic, commonly reported symptoms include abdominal pain in the right upper quadrant, pruritus, jaundice, fatigue, and fever. The most common signs are hepatomegaly and splenomegaly. Prolonged cholestasis in PSC may cause fat-soluble vitamin deficiency leading to osteoporosis Diagnosis requires elevated serum alkaline phosphatase persisting for at least 6 months and the presence of bile duct strictures on cholangiogram. Unlike primary biliary cholangitis, PSC lacks a diagnostic autoantibody or reliable biomarker of disease progression.
Sources: en.wikipedia.org
==== MeSH E05.196.922 – titrimetry ==== MeSH E05.196.922.250 – colorimetry MeSH E05.196.922.375 – complement hemolytic activity assay MeSH E05.196.922.500 – conductometry MeSH E05.196.922.625 – neutralization tests MeSH E05.196.922.750 – potentiometry MeSH E05.196.922.875 – skin test end-point titration
2,5-Diketopiperazine is an organic compound with the formula (NHCH2C(O))2. The compound features a six-membered ring containing two amide groups at opposite positions in the ring. It was first compound containing a peptide bond to be characterized by X-ray crystallography in 1938. It is the parent of a large class of 2,5-Diketopiperazines (2,5-DKPs) with the formula (NHCH2(R)C(O))2 (R = H, CH3, etc.). They are ubiquitous peptides in nature. They are often found in fermentation broths and yeast cultures as well as embedded in larger more complex architectures in a variety of natural products as well as several drugs. In addition, they are often produced as degradation products of polypeptides, especially in foods and beverages. They have also been found in extraterrestrial objects such as comets and asteroids.
Suvomipic (INNTooltip International Nonproprietary Name; developmental code names PP405 and JXL069) is a drug acting as a mitochondrial pyruvate carrier (MPC) inhibitor which is under development for the treatment of alopecia (hair loss), specifically androgenic alopecia (pattern hair loss). It is used topically as a 0.05% concentration gel on the scalp once-daily. Suvomipic is a possible first-in-class drug with a novel mechanism of action in the potential treatment of hair loss. The drug's generic name and chemical structure were published in July 2026, revealing PP405 to be the existing compound JXL069.
Sources: en.wikipedia.org
No. It is a laboratory-made analog of growth hormone-releasing hormone. The natural hormone is a 44-residue peptide, while the analog is built on a shorter 29-residue fragment.
The original material included a linker that binds serum albumin. A later variant removed that linker to reduce the duration of action. Catalogs and papers did not consistently adopt separate names, so both remain widely labeled with the same term.
The amino acid sequence and the presence or absence of the linker group. Mass measured by spectrometry gives an independent check that separates the two forms.
The powder is normally held at minus twenty degrees Celsius or below. Light and moisture exposure should be minimized. Repeated warming and cooling cycles are avoided.