The short version of Lyophilized powder fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-12-18. Anything still debated is marked as such rather than presented as settled.
Two related peptides circulate under the CJC-1295 label, and they differ mainly in how long they persist in circulation. The version carrying a drug affinity complex includes a maleimidopropionic acid linker that forms a covalent bond with serum albumin. The other version, usually written as modified GRF(1-29) or tetrasubstituted GRF(1-29), lacks that linker and is cleared quickly. Mixing the two produces inconsistent readings of published half-life values, because the linker rather than the receptor-facing sequence drives most of the difference.
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 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.
| Property | Value | Notes |
|---|---|---|
| Class | Synthetic peptide | GHRH receptor agonist |
| Sequence length | 29 amino acids | Derived from human GHRH |
| Molecular weight | About 3368 Da without linker | Albumin-binding form is heavier |
| Appearance | White to off-white lyophilized powder | Common form for research reference material |
| Typical storage | -20 °C or below, desiccated | Protect powder from light and moisture |
The peptide binds GHRH receptors on somatotroph cells within the anterior pituitary, triggering a signalling cascade that increases growth hormone secretion. Its improved resistance to dipeptidyl peptidase IV degradation distinguishes it from the parent hormone. In the DAC-bearing version, a maleimide group reacts with a cysteine residue on serum albumin, forming a covalent bond that keeps the peptide in circulation far longer. That albumin attachment is the central design feature separating the two research variants.
Pharmacokinetic behaviour differs sharply between the two forms. The DAC-bearing peptide shows an extended circulation time measured in days, whereas the version without the complex is cleared within roughly half an hour. This gap shapes how researchers design dosing schedules in animal models. Whether the prolonged presence of the DAC form produces effects meaningfully different from the short-acting variant remains an open question, since comparative human data are scarce.
CJC-1295 is a synthetic peptide designed to mimic growth hormone-releasing hormone (GHRH), the endogenous signal that prompts the pituitary gland to release growth hormone. The compound is a modified fragment of the natural hormone, spanning the first twenty-nine amino acids of GHRH with several substitutions that slow enzymatic breakdown. Two variants circulate in research settings: one carrying a drug affinity complex (DAC) and one without it. The DAC-free form is frequently labelled Mod GRF(1-29) in catalogs and discussion forums.
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.
Purity is most often assessed by reversed-phase high-performance liquid chromatography, reported as a percentage of total peak area. Identity is confirmed by mass spectrometry, which yields a molecular ion consistent with the expected sequence. Amino acid analysis and peptide mapping provide additional characterization. Reported purity values are method-dependent, so figures from different laboratories are not always directly comparable without details of column, gradient, and detection wavelength.
Peptide degradation proceeds mainly through hydrolysis, oxidation of methionine, and deamidation of asparagine or glutamine residues. The maleimide group on the albumin-binding variant can also react with thiols or hydrolyze in aqueous media. Because these pathways accelerate with temperature and pH extremes, handling conditions strongly influence measured stability. Stability data in the public literature are limited and often generated under differing conditions, so general statements about shelf life should be read as approximate.
Lyophilized peptide powder is comparatively stable when kept dry, cold, and protected from light. Once dissolved, the molecule is vulnerable to deamidation, oxidation, and aggregation, with the rate depending on pH, buffer composition, and temperature. Alkaline conditions and repeated freeze-thaw cycles accelerate loss of the intact peptide. The methionine present in the native sequence is a known oxidation site, which is one reason it was replaced in the modified fragment. Suppliers typically recommend cold storage of solutions and use within a short window.
Analytical confirmation usually relies on reversed-phase high-performance liquid chromatography for purity and on liquid chromatography coupled to mass spectrometry for identity. Mass data reveal the expected molecular mass and can flag truncated or oxidized species. Amino acid analysis and peptide mapping provide sequence-level verification. Immunoassays are used in some biological matrices, but antibodies raised against one releasing-hormone analog may cross-react with another. Reported purity figures depend heavily on the method used, so comparisons between suppliers require matching the analytical approach.
The two variants differ dramatically in how long they persist in circulation. The form lacking the albumin-binding group has a plasma half-life measured in tens of minutes, comparable to the natural hormone fragment. The version carrying the drug affinity complex binds albumin and shows a half-life of roughly six to eight days in human studies. That figure comes from small trials that tracked hormone levels over extended periods. The physiological consequences of sustained versus pulsatile stimulation are still debated and the literature does not settle the point.
Hyperthyroidism (an example is Graves' disease) is the clinical syndrome caused by an excess of circulating free thyroxine, free triiodothyronine, or both. It is a common disorder that affects approximately 2% of women and 0.2% of men. Thyrotoxicosis is often used interchangeably with hyperthyroidism, but there are subtle differences. Although thyrotoxicosis also refers to an increase in circulating thyroid hormones, it can be caused by the intake of thyroxine tablets or by an over-active thyroid, whereas hyperthyroidism refers solely to an over-active thyroid. Hypothyroidism (an example is Hashimoto's thyroiditis) is the case where there is a deficiency of thyroxine, triiodothyronine, or both. Clinical depression can sometimes be caused by hypothyroidism, whereas bipolar disorder can sometimes be caused by hyperthyroidism. Some research has shown that T3 is found in the junctions of synapses, and regulates the amounts and activity of serotonin, norepinephrine, and γ-aminobutyric acid (GABA) in the brain. Hair loss can sometimes be attributed to a malfunction of T3 and T4. Normal hair growth cycle may be affected disrupting the hair growth. Both thyroid excess and deficiency can cause cardiovascular disorders or make preexisting conditions worse. The link between excess and deficiency of thyroid hormone on conditions like arrhythmias, heart failure, and atherosclerotic vascular diseases, have been established for nearly 200 years.
However, antiviral resistance is known to develop if mutations to the neuraminidase proteins prevent NAI binding. This was seen in the H257Y mutation, which was responsible for oseltamivir resistance to H1N1 strains in 2009. The inability of NA inhibitors to bind to the virus allowed this strain of virus with the resistance mutation to spread due to natural selection. Furthermore, a study published in 2009 in Nature Biotechnology emphasized the urgent need for augmentation of oseltamivir stockpiles with additional antiviral drugs including zanamivir. This finding was based on a performance evaluation of these drugs supposing the 2009 H1N1 'Swine Flu' neuraminidase (NA) were to acquire the oseltamivir-resistance (His274Tyr) mutation, which is currently widespread in seasonal H1N1 strains.
P. s. pv. aceris attacks maple Acer species. P. s. pv. actinidiae attacks kiwifruit Actinidia chinensis. P. s. pv. aesculi attacks horse chestnut Aesculus hippocastanum, causing bleeding canker. P. s. pv. aptata attacks beets Beta vulgaris. P. s. pv. atrofaciens attacks wheat Triticum aestivum. P. s. pv. dysoxylis attacks the kohekohe tree Dysoxylum spectabile. P. s. pv. glycinea attacks soybean Glycine max, causing bacterial blight of soybean. P. s. pv. japonica attacks barley Hordeum vulgare. P. s. pv. lapsa attacks wheat Triticum aestivum. P. s. pv. panici attacks Panicum grass species. P. s. pv. papulans attacks crabapple Malus sylvestris species. P. s. pv. persicae attacks nectarine and peach. P. s. pv. phaseolicola causes halo blight of beans. P. s. pv. pisi attacks peas Pisum sativum. P. s. pv. syringae attacks Syringa, Prunus, and Phaseolus species. P. s. pv. tomato attacks tomato. However, many of the strains for which new species groupings were proposed continue to be referred to in the scientific literature as pathovars of P. syringae, including pathovars tomato, phaseolicola, and maculicola. Pseudomonas savastanoi was once considered a pathovar or subspecies of P. syringae, and in many places continues to be referred to as P. s. pv. savastanoi, although as a result of DNA-relatedness studies, it has been instated as a new species. It has three host-specific pathovars: P. s. fraxini (which causes ash canker), P. s. nerii (which attacks oleander), and P. s. oleae (which causes olive knot).
Sources: en.wikipedia.org
In 2022, genomic epidemiologists reported results from a global survey of antimicrobial resistance via genomic wastewater-based epidemiology, finding large regional variations, providing maps, and suggesting resistance genes are also passed on between microbial species that are not closely related. The WHO provides the Global Antimicrobial Resistance and Use Surveillance System (GLASS) reports which summarize annual (e.g. 2020's) data on international AMR, also including an interactive dashboard.
Most cases have been diagnosed post-mortem following a biopsy of the patient's brain tissue. It takes one to twelve days, median five, for symptoms to appear after nasal exposure to N. fowleri flagellates. Symptoms may include headache, fever, nausea, vomiting, loss of appetite, altered mental state, coma, drooping eyelid, blurred vision, and loss of the sense of taste. Later symptoms may include stiff neck, confusion, lack of attention, loss of balance, seizures, and hallucinations. Once symptoms begin to appear, the patient usually dies within two weeks. N. fowleri is not contagious; an infected person cannot transmit the infection. Primary amoebic meningoencephalitis is classified as a rare disease in the United States, as it affects fewer than 200,000 people. From 2013 to 2022, 29 infections were reported in the US, which compares with about 4,000 annual deaths by drowning. It is so rare that individual cases are often reported internationally, with 381 cases reported globally. The true number of cases is likely to be higher than those reported due to problems related with diagnosis, access to diagnostic testing and a lack of surveillance. Over 40% of all known global cases of primary amoebic meningoencephalitis are reported in the United States. Animals can become infected by Naegleria fowleri. This is rarely observed, although many cases are thought to be overlooked. Experimentally, mice, guinea pigs, and sheep have been infected, and there have been reports of South American tapirs and cattle contracting PAM.
== Principle of operations == In peptide biosensors, peptides serve as the selective recognition element due to their amino acid sequence, which also accounts for their tailored binding affinity and specificity towards various analytes. When the analyte interacts with the peptide recognition elements via non-covalent interactions, this interaction produces a change that can be transduced into a measurable signal. Peptides on their own cannot generate a quantifiable signal after binding events with the analytes, they must be bio-conjugated to signal markers. Common detection strategies include optical methods such as fluorescence resonance energy transfer (FRET), electrochemical outputs such as change in current, impedance, or potential, and sometimes mechanical or piezoelectric signals if the peptide-analyte binding alters mass or surface properties. These methods are commonly employed due to their sensitivity and compatibility with small peptide-based interfaces
Many proteins are composed of several protein domains, i.e. segments of a protein that fold into distinct structural units. Domains usually have specific functions, such as enzymatic activities (e.g. kinase) or they serve as binding modules.
Sources: en.wikipedia.org
it reflected complex political and social motivations it was not a fascist uprising, although the Italian Social Movement led it (as viewed by leftists, that it was an interclass, inter-party and intergenerational movement, that it was an anti-state uprising (in view of the “autonomous republics”) it was spontaneous and without direction, despite Mayor Battaglia's call to strike. Some studies reported the influence of the 'ndrangheta, colluding with the right (e.g., the Baracca anarchists). Another theory is that the state and secret services were involved and used it to increase tension in the country. In the 1980s, Calabria remained undeveloped. It was dominated by power groups linked to organized crime and deviant freemasonry. Social and economic initiatives, barely advanced, assuming the availability of human and other resources that did not exist. Many (expensive) works mostly benefited a few entrepreneurs rather than the masses. The 'Ndrangheta began to make headlines thanks to its ransom kidnappings (such as the one of John Paul Getty III, grandson of J. Paul Getty, onetime world's richest man who was taken in 1973 and released upon payment of a one billion seven hundred million lire ransom). In the 1980s, they turned to narcotics trafficking, forging contacts with South American drug cartels and feuding with Mafia clans for control of territory. As in Sicily, the 'ndrangheta infiltrated the politics, placing its people in municipal administrations.
=== TikTok === ByteDance planned on Douyin expanding overseas. The founder of ByteDance, Zhang Yiming, stated that "China is home to only one-fifth of Internet users globally. If we don't expand on a global scale, we are bound to lose to peers eyeing the four-fifths. So, going global is a must." ByteDance created TikTok as an overseas version of Douyin. TikTok was launched in the international market in September 2017. On 9 November 2017, ByteDance spent nearly $1 billion to purchase Musical.ly, a startup headquartered in Shanghai with an overseas office in Santa Monica, California. Musical.ly was a social media video platform that allowed users to create short lip-sync and comedy videos, initially released in August 2014. TikTok merged with Musical.ly on 2 August 2018 with existing accounts and data consolidated into one app, keeping the title TikTok. On 23 January 2018, the TikTok app ranked first among free application downloads on app stores in Thailand and other countries. TikTok has been downloaded more than 130 million times in the United States and has reached 2 billion downloads worldwide, according to data from mobile research firm Sensor Tower (those numbers exclude Android users in China). In the United States, Jimmy Fallon, Tony Hawk, and other celebrities began using the app in 2018. Other celebrities like Jennifer Lopez, Jessica Alba, Will Smith, and Justin Bieber joined TikTok. In January 2019, TikTok allowed creators to embed merchandise sale links into their videos.
=== Category:EC 3.1 (act on ester bonds) === Nuclease Endonuclease Exonuclease Category:EC 3.1.1 Acid hydrolase Phospholipase A (EC 3.1.1.4) Acetylcholinesterase (EC 3.1.1.7) Cholinesterase (EC 3.1.1.8) Lipoprotein lipase (EC 3.1.1.34) Category:EC 3.1.2 Ubiquitin carboxy-terminal hydrolase L1 (EC 3.1.2.15) Category:EC 3.1.3 Phosphatase Alkaline phosphatase (EC 3.1.3.1) Fructose bisphosphatase (EC 3.1.3.11) Category:EC 3.1.4 Phospholipase C (EC 3.1.4.3) CGMP specific phosphodiesterase type 5 (EC 3.1.4.17) Phospholipase D (EC 3.1.4.50) (3-methyl-2-oxobutanoate dehydrogenase (2-methylpropanoyl-transferring))-phosphatase Category:EC 3.1.21 Restriction enzyme Type 1 (EC 3.1.21.3) Restriction enzyme Type 2 (EC 3.1.21.4) Restriction enzyme Type 3 (EC 3.1.21.5) Restriction enzyme Type 4 (?) Deoxyribonuclease I (EC 3.1.21.1) Category:EC 3.1.26 RNase H (EC 3.1.26.4) Category:EC 3.1.27 Ribonuclease
Sources: en.wikipedia.org
Natural GHRH is degraded quickly by dipeptidyl peptidase-4 and related enzymes, giving it a half-life measured in minutes. CJC-1295 carries substitutions that slow that breakdown, so it stays intact longer. Both act at the same pituitary receptor and produce the same class of signal.
The label was first attached to the albumin-binding form during early development work. A shorter analog without the linker later became known by the same name in informal use. Published papers normally state which version was studied, so the methods section resolves the ambiguity.
It is a synthetic peptide rather than a steroid, and it does not occur naturally in the body. Its sequence is derived from a hypothalamic hormone called growth hormone-releasing hormone. It works as a receptor agonist rather than as a replacement for that hormone.
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.