A practical reference on albumin binding: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-09-19 and is reviewed periodically as new material appears.
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.
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.
Receptor level activity follows the canonical GHRH pathway. The peptide binds the GHRH receptor, a class B G protein coupled receptor on somatotroph cells of the anterior pituitary. Binding raises intracellular cyclic AMP, which promotes calcium entry and the release of growth hormone into the bloodstream. Because the molecule acts at the same receptor as the endogenous hormone, its effect is superimposed on the natural pulsatile rhythm rather than replacing it. Whether sustained receptor occupation leads to desensitization is not fully settled.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular weight (no linker) | ~3.37 kDa | Calculated from peptide sequence |
| Molecular weight (with linker) | ~3.65 kDa | Includes albumin-binding moiety |
| Appearance | White to off-white powder | Typically lyophilized |
| Solubility | Soluble in water | Also dissolves in aqueous buffers |
| Common synonyms | Modified GRF(1-29), DAC:GRF | Usage varies by source |
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.
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.
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.
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.
== Selected articles == Meyer, D. E., & Chilkoti, A. (1999). Purification of recombinant proteins by fusion with thermally-responsive polypeptides. Nature Biotechnology, 17(11), 1112–1115. Nath, N., & Chilkoti, A. (2002). A colorimetric gold nanoparticle sensor to interrogate biomolecular interactions in real time on a surface. Analytical chemistry, 74(3), 504–509. Ma, H., Hyun, J. Chilkoti, A. (2004). "Nonfouling" oligoethylene glycol functionalized polymer brushes synthesized by surface-initiated atom transfer radical polymerization. Advanced Materials, 16, 338–341. Dreher, M. R., Liu, W., Michelich, C. R., Dewhirst, M. W., Yuan, F., & Chilkoti, A. (2006). Tumor vascular permeability, accumulation, and penetration of macromolecular drug carriers. Journal of the National Cancer Institute, 98(5), 335–344. Ciracì, C., Hill, R. T., Mock, J. J., Urzhumov, Y., Fernández-Domínguez, A. I., Maier, S. A., ... & Smith, D. R. (2012). Probing the ultimate limits of plasmonic enhancement. Science, 337(6098), 1072–1074.
=== Sports === Current evidence-based studies show that unusually high levels of circulating testosterone are associated with increased athletic performance in women, unless they lack androgen sensitivity. However, controversy has emerged in the form of the claim that testosterone is not unlike any other physical parameter with reference to bestowing advantages or disadvantages on female athletes. Existing regulations throughout competitive sports are currently being refined to specifically address this particular claim. Following the case of South African athlete Caster Semenya, an athlete with a difference in sex development (DSD) and internal testes, the International Association of Athletics Federations introduced its hyperandrogenism regulations, which restricted those registered as women with high testosterone levels, whether the hormones were produced by ovaries, adrenals, or testes. These regulations replaced the earlier sex verification rules. Following a series of legal challenges, regulations called the Eligibility Regulations for the Female Classification (Athletes with Differences of Sexual Development) were released on 1 May 2019. These regulations apply only to athletes who have a DSD, high testosterone and virilization, and no longer include hyperandrogenism from non-DSD-related causes such as PMOS. Such DSDs, often seen in people who have a Y chromosome and testes, include 5α‐reductase deficiency, partial androgen insensitivity, and congenital adrenal hyperplasia.
Hib information on the World Health Organization (WHO) site. Fact sheet on the Centers for Disease Control and Prevention (CDC) site. Type strain of Haemophilus influenzae at BacDive – the Bacterial Diversity Metadatabase
Medical conditions that can cause joint hypermobility include FASDs, Stickler syndrome, Ehlers–Danlos syndrome, Marfan syndrome, Loeys–Dietz syndrome, rheumatoid arthritis, osteogenesis imperfecta, lupus, polio, Fragile X syndrome, Down syndrome, Morquio syndrome, cleidocranial dysostosis and myotonia congenita. All have other diagnostic criteria as well. Current thinking suggests four causative factors:
Sources: en.wikipedia.org
In 2013, Xi coined the slogan "both sides of the Taiwan Strait are one family" regarding mainland China and Taiwan. Wang Yu-chi, Minister of Taiwan's Mainland Affairs Council, spoke with Zhang Zhijun, Director of the Taiwan Affairs Office, met in 2014, making the first official, high-level, government-to-government contact between the two sides since 1949. In November 2015, Xi met with Taiwanese president Ma Ying-jeou, which marked the first time the political leaders of both sides of the Taiwan Strait have met since the end of the Chinese Civil War in mainland China in 1950. However, the relations started deteriorating after Tsai Ing-wen of the Democratic Progressive Party (DPP) won the 2016 presidential elections. In the 19th Party Congress held in 2017, Xi reaffirmed six of the nine principles that had been affirmed continuously since the 16th Party Congress in 2002, with the notable exception of "Placing hopes on the Taiwan people as a force to help bring about unification". According to the Brookings Institution, Xi used stronger language on potential Taiwan independence than his predecessors towards previous DPP governments in Taiwan. Xi said that "we will never allow any person, any organisation, or any political party to split any part of the Chinese territory from China at any time at any form." At the same time, he offered the chance for open talks and "unobstructed exchanges" with Taiwan as long as the government moved to accept the 1992 Consensus.
=== Cell culture === Connecting the DMF chip to use in the field or world-to-chip interfaces have been accomplished by means of manual pumps and reservoirs which deliver microbes, cells, and media to the device. The lack of extensive pumps and valves allow for elaborate multi step applications involving cells performed in a simple and compact system. In one application, microbial cultures have been transferred onto the chip and allowed to grow with the use of sterile procedures and temperature required for microbial incubation. To validate that this was a viable space for microbial growth, a transformation assay was carried out in the device. This involves exposing E.coli to a vector and heat shocking the bacteria until they take up the DNA. This is then followed by running a DNA gel to assure that the wanted vector was taken up by the bacteria. This study found that the DNA indeed was taken up by the bacteria and expressed as predicted. Human cells have also been manipulated in Digital Microfluidic Immunocytochemistry in Single Cells (DISC) where DMF platforms were used to culture and use antibodies to label phosphorylated proteins in the cell. Cultured cells are then removed and taken off chip for screening. Another technique synthesizes hydrogels within DMF platforms. This process uses electrodes to deliver reagents to produce the hydrogel, and delivery of cell culture reagents for absorption into the gel. The hydrogels are an improvement over 2D cell culture because 3D cell culture have increased cell-cell interactions and cel-extracellular matrix interactions.
== Early life and education == Francisco "Kiko" Tiu Laurel Jr. was born to Francisco Sr. and Bella Tiu Laurel. As a teenager, Laurel was involved in the Frabelle Fishing Company, and became a full-time employee at 20, where he started in the Engineering department before moving into sales and leadership. He did not finish a college degree, saying that he had dropped out at the age of 19 to find a job that would support his first child.
He received his first Golden Globe Award for Best Actor – Motion Picture Drama and nominations for an Academy Award, a BAFTA Award and a Screen Actors Guild Award. In 2006, DiCaprio starred in the crime film The Departed and the political war thriller Blood Diamond. In Scorsese's The Departed, DiCaprio played the role of Billy Costigan, a state trooper working undercover in the Irish Mob in Boston, someone he characterizes as being in a "constant 24-hour panic attack". DiCaprio especially liked the experience of working with co-star Jack Nicholson, describing a scene with him as "one of the most memorable moments" of his life as an actor. In preparation, he visited Boston to interact with people associated with the Irish Mob and gained 15 pounds (6.8 kg) of muscle. Critically acclaimed, the film grossed $291 million against a budget of $90 million, becoming DiCaprio and Scorsese's highest-grossing collaboration to that point. Peter Travers of Rolling Stone praised DiCaprio's and co-star Matt Damon's performances as "explosive, emotionally complex", but felt that Nicholson overshadowed the two. Despite DiCaprio's leading role in The Departed, the film's distributor Warner Bros. Pictures submitted his performance for a Best Supporting Actor nomination at the AMPAS to avoid internal conflict with his part in Blood Diamond. Instead, his co-star Mark Wahlberg was nominated, though DiCaprio earned other accolades for The Departed, including a Satellite Award for Best Supporting Actor and Best Actor nominations at the Golden Globes and BAFTA Awards.
Injection of corticosteroids may or may not alleviate symptoms better than simulated (placebo) injections. There is no evidence that corticosteroid injection sustainably alters the natural history of the disease, which seems to be a gradual progression of neuropathy. Surgery to cut the transverse carpal ligament is the only known disease modifying treatment.
Sources: en.wikipedia.org
== Science and mathematics == Semi-infinite programming, a type of mathematical optimization problem Spectral induced polarisation, in geophysics Stable-isotope probing, used in molecular biology Statistically improbable phrases, a system used to find unique phrases for use as keywords Stochastic Information Packet, in probability management, a representation of the probability distribution of a variable Strongly implicit procedure, an algorithm for solving a sparse linear system of equations Structure-inducing probes, a peptide synthesis to stabilize long peptides
In order to attain a concentration that makes sense with the data, the dilutions, concentrations, and units of the unknown must be normalized (Table 1). To do this, one must divide concentration by volume of protein in order to normalize concentration and multiply by amount diluted to correct for any dilution made in the protein before performing the assay.
==== Type 3 ==== VWD type 3 is a rare but the most severe form of VWD. It occurs in individuals who are homozygous for the defective gene, resulting in a severe quantitative deficiency or complete absence of von Willebrand factor (VWF) production. In VWD type 3, VWF is undetectable in the VWF antigen assay. Since VWF normally protects coagulation factor VIII from proteolytic degradation, the total absence of VWF leads to extremely low factor VIII levels (typically 1-10%). These low levels are equivalent to those seen in severe hemophilia A, with clinical manifestations of life-threatening external and internal hemorrhages. The inheritance pattern of VWD type 3 is autosomal recessive, meaning that both parents must carry the defective gene for their child to be affected. In contrast, hemophilia A follows an X-linked recessive inheritance pattern. Additional diagnostic tools for VWD type 3 include assessing VWF activity using the Ristocetin cofactor assay and Collagen binding assay. In VWD type 3, VWF activity is either absent or approaching undetectable. VWF multimer analysis reveals no bands or very faint bands on electrophoresis. Additionally, Ristocetin-Induced Platelet Agglutination (RIPA) is typically absent or severely low.
However, in later versions both teams have gained substantial advantage from the addition of a map hotkey. This overlays the whole level, showing teammates and friendly structures; plus enemies and structures currently in view of comrades, and areas under attack. The aliens start with one active hive, randomly chosen from the 3 hive spots of the map. Active hives heal damaged aliens and respawn dead players. Marines initially spawn in a set location on the map, and after that spawn from Infantry Portals, which can be built in a set radius of the Command Chair. Healing and ammunition can be dropped by the commander in 'packs' (at a cost) or obtained free from an Armoury. The teams compete for territory, and critically for the resources ('res') it offers. The currency for both sides, resources are obtained by building resource towers to tap the nozzles sited around the map. This is another area where the teams have a key difference - while marines draw on a common pool of resources, each alien accumulates a personal store. This further increases the requirement for teamwork on the alien side, to achieve the right balance of hives, lifeforms, resource towers and chambers. The game ends when either all the marines or aliens are dead, and have no means to respawn. For the Frontiersmen (marine) side, this entails destroying all alien hives, ensuring no further alien players may respawn, and then hunting the rest down.
Sources: en.wikipedia.org
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.
Early development used the albumin-binding form, and a shorter variant was later discussed under the same label. Because the two differ in half-life and handling, ambiguity arises whenever a source omits the variant designation.
The compound derives from that fragment but is not identical to it. The parent fragment lacks the stabilizing substitutions, so its degradation rate and duration of action differ noticeably.
The names are often used interchangeably in casual writing, but they are not strictly identical. Modified GRF(1-29) refers to the unconjugated analogue carrying only the four substitutions. The version sold as CJC-1295 with DAC includes the albumin binding linker and clears much more slowly.