This is a working overview of Maleimide chemistry, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-08-26 and is reviewed periodically as new material appears.
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.
Research material is normally supplied as a freeze-dried powder in sealed vials. In that state the peptide is comparatively robust, but prolonged exposure to warmth, moisture, or light accelerates degradation. Storage at minus twenty degrees Celsius or lower, with desiccant and protection from light, is the commonly described practice. Vials should be allowed to reach room temperature before opening to limit condensation on the powder. Moisture uptake during handling is a recognized source of variability in later measurements.
Reconstitution is typically performed with sterile water or bacteriostatic water, added slowly against the vial wall. The resulting solution should be clear and colorless; cloudiness or visible particles suggest a problem with the material or the diluent. Once in solution, the peptide is less stable than the dry powder. Refrigerated storage at two to eight degrees Celsius is common for short-term holding, while freezing aliquots is described for longer periods.
| Property | Value | Notes |
|---|---|---|
| Peptide class | Synthetic GHRH analogue | Built on a 29 residue sequence |
| Primary target | GHRH receptor (GHRHR) | Class B G protein coupled receptor |
| Unconjugated half life | Minutes | Limited by protease degradation |
| Key modification | Four residue substitutions | Positions 2, 8, 15 and 27 |
| Common synonym | Modified GRF(1-29) | Usually denotes the form without DAC |
Enzymatic protection is a separate mechanism from plasma protein binding. The four substitutions in the backbone reduce recognition by dipeptidyl peptidase IV, which normally cleaves the natural hormone within minutes. Without the reactive group, this resistance still yields only a short window of activity, generally reported in the range of tens of minutes. With it, reported half-lives in early human work extended to several days. The size of that gap is the main practical distinction between the two materials.
Both forms act at the pituitary receptor for growth hormone-releasing hormone and increase growth hormone output, which in turn raises insulin-like growth factor 1. A long-acting analog produces sustained rather than pulsatile stimulation, and the physiological consequences of that pattern are not fully settled. Published human data on the extended form remain limited, and much of what circulates in discussion traces to early company reports rather than independent replication. How sustained exposure affects normal feedback remains an open question.
The core sequence keeps the receptor-binding region of GHRH while replacing four positions that are vulnerable to dipeptidyl peptidase-4 and other proteases. Substitutions at positions 2, 8, 15, and 27 raise metabolic stability relative to the natural hormone. The N-terminal residues remain essential for activity, so changes there generally lower potency. Molecular weight sits near 3368 daltons for the tetrasubstituted analog without the linker, while the albumin-binding form is heavier because of the added maleimide group.
CJC-1295 is a synthetic peptide modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. Its sequence corresponds to the first twenty-nine residues of human GHRH, with four substitutions that slow enzymatic breakdown. Early descriptions placed the compound in research on growth hormone deficiency and related conditions, and later literature groups it with the long-acting GHRH analogs. The name appears in both laboratory and popular fitness writing, where it sometimes labels chemically different peptides.
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.
== History == Gordon C. Sharp first described mixed connective tissue disease (MCTD) in 1972 as an entity with mixed features of systemic sclerosis (SSc), systemic lupus erythematosus (SLE), polymyositis/dermatomyositis (PM/DM), and rheumatoid arthritis (RA) along with an elevated level of high-titre anti-U1small nuclear (sn) anti-ribonucleoprotein (anti-RNP) antibodies.
watch glass A circular, concave piece of glass commonly used in chemistry laboratories as a working surface for various purposes, such as evaporating liquids, holding solids while they are being weighed, heating small amounts of a substance, or as a cover for a beaker.
=== Recognition of scientific advances === Coleman and Friedman have been awarded numerous prizes acknowledging their roles in discovery of leptin, including the Gairdner Foundation International Award (2005), the Shaw Prize (2009), the Lasker Award, the BBVA Foundation Frontiers of Knowledge Award and the King Faisal International Prize, Leibel has not received the same level of recognition from the discovery because he was omitted as a co-author of a scientific paper published by Friedman that reported the discovery of the gene. The various theories surrounding Friedman's omission of Leibel and others as co-authors of this paper have been presented in a number of publications, including Ellen Ruppel Shell's 2002 book The Hungry Gene. The discovery of leptin also is documented in a series of books including Fat: Fighting the Obesity Epidemic by Robert Pool, The Hungry Gene by Ellen Ruppel Shell, and Rethinking Thin: The New Science of Weight Loss and the Myths and Realities of Dieting by Gina Kolata. Fat: Fighting the Obesity Epidemic and Rethinking Thin: The New Science of Weight Loss and the Myths and Realities of Dieting review the work in the Friedman laboratory that led to the cloning of the ob gene, while The Hungry Gene draws attention to the contributions of Leibel.
Most research into petrochemical hydrocarbons using GC×GC has utilised flame ionisation detection (FID) but mass spectrometry (MS) is necessary to obtain the structural information necessary to identify unknown compounds. Currently, only time-of-flight MS (ToF-MS) can deliver the high acquisition rates required to analyse GC×GC.
Conversion of Druze to Christianity used to be common practice in the Levant region. Over the centuries, a number prominent Druze embraced Christianity, such as some of Shihab dynasty members, as well as the Abi-Lamma clan. Since emir Bashir III was among the Shehab princes who converted to Christianity at an earlier time, the Druze considered him an apostate, a traitor to the Druze community in particular. The Abu'l-Lama family and clan, originally of Tanukh descent, ruled over Lebanon's Metn region during the seventeenth and eighteenth centuries. Initially adherents of the Druze faith, the Abu'l-Lama sheikhs and clan members later converted to Christianity and joined the Maronite Church at the beginning of the eighteenth century. The clan constructed numerous palaces and structures, many of which still stand today in the Metn region and Mount Lebanon. After converting to Christianity, many of Abu'l-Lama clan members assumed the position of qaimmaqam of the Christians in Lebanon during the Ottoman period. Among them was emir Haydar Ahmad Abu al-Lamaʿ, who served as the qāʾim maqām of the largely Christian northern district. During the nineteenth and twentieth centuries, Protestant missionaries established schools and churches in Druze strongholds, with some Druze converting to Protestant Christianity; yet they did not succeed to convert Druze to Christianity en masse. On the other hand, many Druze immigrants to the United States converted to Protestantism, becoming communicants of the Presbyterian or Methodist Churches.
Sources: en.wikipedia.org
=== Phase 3 === Clomipramine/sildenafil (CDFR-0812) – combination of clomipramine (tricyclic antidepressant (TCA), serotonin–norepinephrine reuptake inhibitor (SNRI), other actions) and sildenafil (phosphodiesterase PDE5 inhibitor) – premature ejaculation [5] Gepirone (Ariza; BMY-13805-1; BMY-13805; Exxua; Gepirone ER; MJ-13805; Org-33062; TGFK07AD; Travivo; Variza) – serotonin 5-HT1A receptor agonist, other actions – decreased libido [6] Nitroglycerin gel (Eroxon; glyceryl trinitrate topical gel; MED-2001; MED-2003; MED-2004; MED-2005; MED-3000; MED2002) – guanylate cyclase stimulant, nitric oxide donor, nitric oxide stimulant – erectile dysfunction [7] Prasterone vaginal (dehydroepiandrosterone; DHEA; Intrarosa; Vaginorm) – androgen (androgen receptor agonist), other actions – decreased libido [8] Sacubitril/valsartan (AHU-377/valsartan; Enrest; Enresuto; Entresto; Entresto Sprinkle; LCZ-696; LCZ-696A; Neparvis; valsartan/AHU-377; valsartan/sacubitril) – combination of sacubitril (neprilysin inhibitor) and valsartan (angiotensin II receptor type 1 (AT1) antagonist) – erectile dysfunction [9]
== Awards and distinctions == Turner was awarded an Honorary Fellowship of the New Zealand College of Public Health Medicine in 2021, and is a Fellow of the Royal New Zealand College of General Practitioners (RNZCGP). In 2020, Turner was a finalist for the Green Cross Health award for outstanding contribution to health at the inaugural New Zealand Primary Healthcare Awards. Turner was the principal investigator leading the Vaccine Effectiveness arm for The Southern Hemisphere Influenza and Vaccine Effectiveness Research and Surveillance (SHIVERS) project (2012–2016) designed to measure the effectiveness of vaccination for influenza and other respiratory infectious diseases. In 2019, in recognition of their major contribution to influenza research, the SHIVERS team, including Turner, received the New Zealand Association of Scientists' Shorland Medal.
Students enrolled in introductory animal science courses at many universities learn animal science through collections of multispecies large-animal specimens. Plastination allows students to have hands-on experience in this field, without exposure to chemicals such as formalin. For example, plastinated canine gastrointestinal tracts are used to help in the teaching of endoscopic technique and anatomy. The plastinated specimens retain their dilated conformation by a positive pressure air flow during the curing process, which allows them to be used to teach both endoscopic technique and gastrointestinal anatomy. With the use of plastination as a teaching method of animal science, fewer animals have to be killed for research, as the plastination process allows specimens to be studied for a long time. TTT sheet plastinates for school teaching and lay instruction provide an impression of the complexity of an animal body in one specimen.
=== Lifestyle === Weight management and a healthy lifestyle are first-line treatments for PMOS. Weight management includes the prevention of weight gain, losing some weight, or maintaining weight loss. Limited weight loss of 5% shows metabolic benefits, and possibly benefits for reproductive health. There is little evidence that one type of healthy diet is better than another in PMOS. In terms of exercise, the general population guidance of 150 minutes of moderate-intensity exercise per week is recommended to prevent weight gain. For weight loss, 250 minutes of moderate exercise is recommended. Lifestyle changes for people with PMOS have been proven to be difficult due to various factors. Some studies indicate that women with PMOS might have problems with feeling sated after eating, making weight loss more challenging. Sleep disorders, more prevalent in women with PMOS, cause fatigue, which further makes a healthy lifestyle more difficult. Finally, issues with body image, eating disorders, depression, or lack of intrinsic motivation (not enjoying exercise) may make lifestyle interventions more difficult. Lifestyle interventions for women with PMOS may include strategies such as setting goals, tracking progress, learning assertiveness, and relapse prevention. These approaches aim to support weight control, a healthy lifestyle, and emotional well-being. Support may also involve using SMART goals (specific, measurable, achievable, realistic, and timely).
Sources: en.wikipedia.org
=== Pharmacodynamics === Finasteride is a 5α-reductase inhibitor. It is specifically a selective inhibitor of the type II and III isoforms of the enzyme. By inhibiting these two isozymes of 5α-reductase, finasteride reduces the formation of the potent androgen dihydrotestosterone (DHT) from its precursor testosterone in certain tissues in the body such as the prostate gland, skin, and hair follicles. As such, finasteride is a type of antiandrogen, or more specifically, an androgen synthesis inhibitor. However, some authors do not define finasteride as an "antiandrogen," a term which can refer more specifically to antagonists of the androgen receptor. Finasteride results in a decrease of circulating DHT levels by about 65–70% with an oral dosage of 5 mg/day and of DHT levels in the prostate gland by up to 80–90% with an oral dosage of 1 or 5 mg/day. In parallel, circulating levels of testosterone increase by approximately 10%, while local concentrations of testosterone in the prostate gland increase by about 7-fold and local testosterone levels in hair follicles increase by around 27–53%. An oral dosage of finasteride of only 0.2 mg/day has been found to achieve near-maximal suppression of DHT levels (68.6% for 0.2 mg/day relative to 72.2% for 5 mg/day). Finasteride does not completely suppress DHT production because it lacks significant inhibitory effects on the 5α-reductase type I isoenzyme, with more than 100-fold less inhibitory potency for type I as compared to type II (IC50Tooltip Half-maximal inhibitory concentration = 313 nM and 11 nM, respectively).
== History == Dei BioPharma was established in 2014 by Ugandan scientist and entrepreneur Dr. Matthias Magoola. Its flagship facility, situated on 150 acres in Matugga, was inaugurated in July 2021 by Ugandan President Yoweri Museveni and then Kenyan Deputy President William Ruto.
As a particle moves toward the pole opposite of its charge it moves through the changing pH gradient until it reaches a point in which the pH of that molecule's isoelectric point is reached. At this point the molecule no longer has a net electric charge (due to the protonation or deprotonation of the associated functional groups) and as such will not proceed any further within the gel. The gradient is established before adding the particles of interest by first subjecting a solution of small molecules such as polyampholytes with varying pI values to electrophoresis. The method is applied particularly often in the study of proteins, which separate based on their relative content of acidic and basic residues, whose value is represented by the pI. Proteins are introduced into an immobilized pH gradient gel composed of polyacrylamide, starch, or agarose where a pH gradient has been established. Gels with large pores are usually used in this process to eliminate any "sieving" effects, or artifacts in the pI caused by differing migration rates for proteins of differing sizes. Isoelectric focusing can resolve proteins that differ in pI value by as little as 0.01. Isoelectric focusing is the first step in two-dimensional gel electrophoresis, in which proteins are first separated by their pI value and then further separated by molecular weight through SDS-PAGE. Isoelectric focusing, on the other hand, is the only step in preparative native PAGE at constant pH.
Romania is a secular state and has no state religion. An overwhelming majority of the population identify themselves as Christians. At the country's 2021 census, 73.60% of respondents identified as Orthodox Christians, with 73.42% belonging to the Romanian Orthodox Church. Other denominations include Protestantism (6.22%), Roman Catholicism (3.89%), and Greek Catholicism (0.61%). From the remaining population 128,291 people belong to other Christian denominations or have another religion, which includes 58,347 Muslims (mostly of Turkish and Tatar ethnicity) and 2,708 Jewish (Jews once constituted 4% of the Romanian population—728,115 persons in the 1930 census). Additionally, 71,430 people are irreligious, 57,229 are atheist, 25,485 are agnostic, and 2,658,165 people chose to not declare their religion. The Romanian Orthodox Church is an autocephalous Eastern Orthodox Church in full communion with other Orthodox churches, with a Patriarch as its leader. It is the third-largest Eastern Orthodox Church in the world, and unlike other Orthodox churches, it functions within a Latin culture and uses a Romance liturgical language. Its canonical jurisdiction covers the territories of Romania and Moldova. Romania has the world's third-largest Eastern Orthodox population.
The nobility, which had obtained legal ownership of vast expanses of land on the Dnipro from the Polish kings, attempted to impose feudal dependency on the local population. Landowners utilized the locals in war, by raising the Cossack registry in times of hostility, and then radically decreasing it and forcing the Cossacks back into serfdom in times of peace. This institutionalized method of control bred discontent among the Cossacks. By the end of the 16th century, they began to revolt, in the uprisings of Kryshtof Kosynsky (1591–1593), Severyn Nalyvaiko (1594–1596), Hryhorii Loboda (1596), Marko Zhmailo (1625), Taras Fedorovych (1630), Ivan Sulyma (1635), Pavlo Pavliuk and Dmytro Hunia (1637), and Yakiv Ostrianyn and Karpo Skydan (1638). All were brutally suppressed and ended by the Polish government. Cossack rebellions eventually culminated in the Khmelnytsky Uprising, led by the hetman of the Zaporizhian Sich, Bohdan Khmelnytsky.
Sources: en.wikipedia.org
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.
DAC stands for drug affinity complex, a term describing the maleimidopropionic acid linker. This group forms a covalent bond with the cysteine residue on serum albumin after administration. The resulting adduct is what extends the circulating half life from minutes to days.
No. It is entirely synthetic and does not correspond to any known endogenous peptide. The design starts from human growth hormone releasing hormone and introduces deliberate substitutions. Any biological effect comes from mimicking the natural hormone at its receptor.
Cool, dark, and dry conditions are standard, with storage at minus twenty degrees Celsius or below. Desiccant and sealed vials limit moisture uptake. Repeated warming and cooling of the container is generally avoided.