This is a working overview of GRF(1-29), written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-11-18. Anything still debated is marked as such rather than presented as settled.
CJC-1295 is a synthetic peptide analog of growth hormone-releasing hormone, constructed on the 29-amino-acid fragment designated GRF(1-29). The name began as an internal development code during the 1990s and later spread through research supply catalogs and discussion forums. The molecule does not occur in nature; its sequence is engineered rather than isolated from tissue. Two related compounds are sold under this single label, and they differ by one appended chemical group that strongly influences how long the peptide remains in circulation.
The dividing feature between the two forms is a maleimide-based drug affinity complex, abbreviated DAC. In the DAC-bearing version, a linker attaches the peptide to serum albumin after administration, and that association slows removal from plasma. The version lacking DAC appears in catalogs as MOD GRF(1-29) or tetrasubstituted GRF(1-29). Because informal writing treats both as one item, comparisons drawn from such sources routinely blend measurements taken from two molecules with substantially different behavior.
Four amino acid substitutions separate the modified backbone from the parent GRF(1-29) sequence. These changes reduce recognition by dipeptidyl peptidase IV and related proteases, extending the interval before degradation. Development work in this area sought longer-acting GHRH analogs for endocrine investigation. Published descriptions treat the substitution set as a defining property of the core sequence, while the albumin-binding linker is described separately as an optional addition to that same backbone.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic peptide | Analog of growth hormone-releasing hormone |
| Chain length | 29 amino acids | Based on the GRF(1-29) fragment |
| Appearance | White to off-white lyophilized powder | Common research supply form |
| Solubility | Soluble in water and aqueous buffers | Powder requires reconstitution before use |
| Typical storage | −20 °C or below | Kept away from light and moisture |
Lyophilized material is generally stable for extended periods when held at minus twenty degrees Celsius or below and protected from moisture and light. In solution the peptide is more labile; bond hydrolysis, aggregation and oxidation of susceptible residues all proceed faster at ambient temperature. Repeated freeze and thaw cycles should be avoided because they promote clumping and loss of soluble material. The conjugated variant adds a further consideration, since the maleimide group can hydrolyze in aqueous buffer and lose its ability to react with albumin.
Laboratory handling centers on minimizing exposure to water, heat and oxygen before use. Working solutions are typically prepared in sterile water or a mild buffer, and any residual particulate matter is removed by filtration. When the powder dissolves slowly, a small proportion of acetonitrile or dilute acetic acid is sometimes added as a co-solvent. Containers are kept sealed and desiccated between uses. Records of lot number, reconstitution date and storage conditions support later comparison of results across experiments.
Verification matters because research peptides vary widely in quality. A certificate of analysis is only as reliable as the method behind it, and a single chromatographic trace reveals little about counter-ions, residual solvents, or water content. Independent laboratories commonly pair mass confirmation with chromatographic purity and, where relevant, quantify water along with acetate or trifluoroacetate content. Reported purity figures are not standardized across suppliers, so a stated value such as ninety-eight percent is not directly comparable unless the analytical method, column, and detection wavelength accompany it.
Characterization of this peptide relies on a small set of routine techniques. Reversed-phase high-performance liquid chromatography separates the target from truncated or oxidized by-products and yields a purity estimate when paired with ultraviolet detection near 214 nanometers. Mass spectrometry, either electrospray coupled to liquid chromatography or matrix-assisted laser desorption, confirms that the observed mass matches the value calculated for the expected sequence. Amino acid analysis, and enzymatic digestion followed by fragment mapping, are used when the sequence itself rather than the mass requires verification.
Stability depends heavily on physical state. A lyophilized powder kept dry, desiccated, and shielded from light typically holds its integrity for months to years at minus twenty degrees Celsius, and longer at minus eighty. Once dissolved, the peptide becomes far more vulnerable, since peptide bond hydrolysis, oxidation of susceptible residues, and aggregation all proceed faster in solution. Buffers near neutral pH are generally gentler than strongly acidic or alkaline conditions. Repeated freeze-thaw cycles and exposure to air-liquid interfaces during vigorous mixing cause losses that are easy to overlook.
== Chemistry == Suvorexant is a small-molecule compound. The chemical name of suvorexant is [(7R)-4-(5-chloro-2-benzoxazolyl)hexahydro-7-methyl-1H-1,4-diazepin-1-yl][5-methyl-2-(2H-1,2,3-triazol-2-yl)phenyl]methanone. Its molecular formula is C23H23N6O2Cl and its molecular weight is 450.92 g/mol. Suvorexant is a white to off-white powder and is lipophilic and insoluble in water. It is structurally related to other orexin receptor antagonists like lemborexant, daridorexant, and seltorexant.
== Structure == The appearance of transitional epithelium differs according to its cell layer. Cells of the basal layer are cuboidal (cube-shaped), or columnar (column-shaped), while the cells of the superficial layer vary in appearance depending on the degree of distension. These cells appear to be cuboidal with a domed apex when the organ or the tube in which they reside is not stretched. When the organ or tube is stretched (such as when the bladder is filled with urine), the tissue compresses and the cells become stretched. When this happens, the cells flatten, and they appear to be squamous and irregular.
== Biosynthesis == Early biosynthesis studies in Cetraria islandica showed that protolichesterinic acid is produced in very small quantities (approximately 0.1%) in the whole lichen. The compound is formed through the condensation of a fatty acid derivative with a C3 or C4 fragment derived from pyruvate or related precursors in the glycolytic pathway. Sixteen of its carbon atoms come from head-to-tail linkage of acetate units. The compound is not produced by isolated mycobionts in submerged culture, suggesting that the symbiotic relationship between fungi and algae may be important for its biosynthesis. The production appears to be influenced by aeration conditions. Further studies using radiolabeled precursors revealed seasonal variation in protolichesterinic acid biosynthesis in C. islandica. When [1-14C]acetate and [1,4-14C2]succinic acid were administered to the whole lichen in a glucose solution during summer months, both precursors were incorporated into protolichesterinic acid, supporting the hypothesis that aliphatic lichen acids have common precursors related to the citric acid and fatty acid cycles. However, during winter months, the lichen showed no incorporation of these precursors, indicating that biosynthesis becomes inactive during this season. The extremely low levels of incorporation (approximately 0.004%) suggested that protolichesterinic acid biosynthesis represents a very minor metabolic pathway in C. islandica.
Sources: en.wikipedia.org
Oveporexton, sold under the brand name Orzeyful, is a medication used for the treatment of narcolepsy type 1. It is taken by mouth. The most common side effects include insomnia, increased urinary frequency, urgency to urinate, and increased saliva production. Oveporexton is an orexin OX2 receptor agonist. Oveporexton was approved for medical use in China in July 2026, and in the United States in August 2026. It is recommended for scheduling under the Controlled Substances Act and will be lawful to market in the US following the scheduling decision issued by the Drug Enforcement Administration.
=== Diseases === Medical conditions associated with weight gain include hypothyroidism, Cushing's syndrome, Polycystic Ovary Syndrome (PCOS), and congestive heart failure. Medical conditions such as cancer, gastrointestinal illness, psychiatric disorders, infections, endocrine disorders, and neurologic disorders may lead to weight loss.
== In other animals == Demyelinating diseases/disorders have been found worldwide in various animals. Some of these animals include mice, pigs, cattle, hamsters, rats, sheep, Siamese kittens, and a number of dog breeds (including Chow Chow, Springer Spaniel, Dalmatian, Samoyed, Golden Retriever, Lurcher, Bernese Mountain Dog, Vizsla, Weimaraner, Australian Silky Terrier, and mixed breeds). Ziggy Star, a female northern fur seal, was treated at the Marine Mammal Center beginning in March 2014 and was noted as the first reported case of a demyelinating disease in a marine mammal. She was later transported to Mystic Aquarium & Institute for Exploration for lifelong care as an ambassador to the public. In 2017, she was the first seal treated for hydrocephalus.
In 2003 the Americana Music Awards awarded Parsons with the President's Award, which was accepted by his daughter. The 2003 film Grand Theft Parsons stars Johnny Knoxville as Phil Kaufman and chronicles a farcical version of the theft of Parsons' corpse. In 2006, Gandulf Hennig released the documentary Gram Parsons: Fallen Angel. In 2004, Parsons' daughter Polly produced two tribute concerts titled "Return to Sin City: A Tribute to Gram Parsons". Artists included Keith Richards, James Burton, Lucinda Williams, Norah Jones, Dwight Yoakam, John Doe, Steve Earle, Jim Lauderdale, Kathleen Edwards, Jay Farrar, Jim James, Raul Malo, Susan Marshall, and the Sin City All Stars. The concert produced a DVD and 100% of the concerts was donated through the Gram Parsons Foundation to the Musician's Assistance Program (now MusiCares), which aids musicians in crisis. Despite his influence, Parsons has yet to be inducted into the Country Music Hall of Fame. The Gram Parsons Petition Project (later named Gram Parsons InterNational) was begun in May 2008 in support of a drive to induct Parsons into the Country Music Hall of Fame. On September 19, 2008, the 35th anniversary of Parsons' death, it was presented to the Country Music Association (CMA) with the official Nomination Proposal. Parsons was inducted in the Rock and Roll Hall of Fame in 2026 through the influence category. In November 2009, the musical theatre production Grievous Angel: The Legend of Gram Parsons premiered, starring Anders Drerup as Gram Parsons and Kelly Prescott as Emmylou Harris.
Sources: en.wikipedia.org
== Prostate cancer == Bicalutamide is used primarily in the treatment of early and advanced prostate cancer. It is approved at a dosage of 50 mg/day as a combination therapy with a gonadotropin-releasing hormone analogue (GnRH analogue) or orchiectomy (that is, surgical or medical castration) in the treatment of stage D2 metastatic prostate cancer (mPC), and as a monotherapy at a dosage of 150 mg/day for the treatment of stage C or D1 locally advanced prostate cancer (LAPC). Although effective in mPC and LAPC, bicalutamide is no longer indicated for the treatment of localized prostate cancer (LPC) due to negative findings in the Early Prostate Cancer (EPC) clinical trial programme. Prior to the introduction of the newer NSAA enzalutamide in 2012, bicalutamide was considered to be the standard-of-care antiandrogen in the treatment of prostate cancer, and still remains widely used for this indication. Compared to earlier antiandrogens like the steroidal antiandrogen (SAA) cyproterone acetate (CPA) and the NSAAs flutamide and nilutamide, bicalutamide shows an improved profile of effectiveness, tolerability, and safety, and for this reason has largely replaced them in the treatment of prostate cancer. In the early 1940s, it was discovered that growth of prostate cancer in men regressed with surgical castration or high-dose estrogen therapy, which produced very low levels of circulating testosterone, and accelerated with the administration of exogenous testosterone.
== Treatment == Immunosuppressive treatment is the gold standard management in order to achieve remission of the blood vessel inflammation that occurs in active microscopic polyangiitis. The current immunosuppressive protocols consists of a combination of high dose of glucocorticoids in combination with either cyclophosphamide or Rituximab. In cases of life threatening disease treatment with plasmapheresis can also be applied. The immunosuppressive treatment is slowly tapered down under a period of several months but there is at the moment no consensus about the total duration of the therapy. Discontinuation of immunosuppression can be related to increased risk for disease flares.
==== Trump impeachment ==== After Dingell voted to impeach President Donald Trump, Trump attacked Dingell during a campaign rally in Battle Creek, musing that her late husband might be in hell, saying of him, "Maybe he's looking up, I don't know, I don't know, maybe, maybe. But let's assume he's looking down." She was attending a bipartisan Problem Solvers Caucus gathering when she was told of Trump's remarks. Numerous members of both parties came to Dingell's defense. In her response to the incident, Dingell called for a return to civility, saying, "some things should be off limits." In her 2022 book Confidence Man, New York Times reporter Maggie Haberman wrote that Dingell received a call from a man claiming to be a reporter who asked whether she was "looking for an apology from Trump". According to Haberman, "Dingell couldn't shake the idea that his voice sounded like that of the forty-fifth president." On June 24, 2025, Dingell was one of 128 House Democrats who voted against an impeachment resolution against President Trump over the June 21 U.S attack on Iran's nuclear sites.
In contrast, FSL Kode constructs usually use specifically selected peptide fragments (up to 40 amino acids), thereby overcoming cross-reactivity with microbial sequences, and allowing for the use of undiluted serum (which increases sensitivity). The F component can be further enhanced by presentation of it in multimeric formats and with specific spacing. The four types of multimeric format include linear repeating units, linear repeating units with spacing, clusters, and branching (Fig. 4).
== Uses in cell biology == Verapamil inhibits the ATP-binding cassette (ABC) transporter family of proteins found in stem cells and has been used to study cancer stem cells (CSC) within head and neck squamous cell carcinomas. Verapamil is also used in cell biology as an inhibitor of drug efflux pump proteins such as P-glycoprotein and other ABC transporter proteins. This is useful, as many tumor cell lines overexpress drug efflux pumps, limiting the effectiveness of cytotoxic drugs or fluorescent tags. It is also used in fluorescent cell sorting for DNA content, as it blocks efflux of a variety of DNA-binding fluorophores such as Hoechst 33342. Radioactively labelled verapamil and positron emission tomography can be used with to measure P-glycoprotein function.
Sources: en.wikipedia.org
No. It is a laboratory-synthesized analog built on a fragment of the natural hormone. The natural peptide is shorter-lived and lacks the stabilizing substitutions found in the synthetic version.
DAC stands for drug affinity complex, a chemical group that binds the peptide to serum albumin. The binding slows clearance and lengthens the time the molecule stays in plasma compared with the unmodified analog.
Because two distinct molecules are discussed under one informal label. The albumin-binding version clears over several days, while the form without that group clears within roughly half an hour. Mixing results from both creates inconsistent figures.
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.