cjc-1295 comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2025-12-24. Where a claim depends on a specific study, the study is described rather than over-claimed.
CJC-1295 belongs to a family of synthetic peptides modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. The compound is built from the first twenty-nine amino acids of the natural human sequence, a fragment that retains full receptor binding capacity. Native growth hormone-releasing hormone is degraded quickly in circulation, so the fragment alone has limited practical value. Early work therefore focused on chemical modifications that preserve receptor binding while slowing enzymatic breakdown. The result is a molecule described in the literature as a long-acting analog of the natural hormone.
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.
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.
Identity and purity are established with reversed phase high performance liquid chromatography coupled to mass spectrometry. The chromatographic step separates the target peptide from truncated sequences and deletion products, while the mass measurement confirms the expected molecular weight to within a fraction of a dalton. Because the two common variants differ by the presence of the linker, mass alone can distinguish them in the unconjugated state. Amino acid analysis and peptide mapping are used when sequence level confirmation is required.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off white powder | Typical lyophilized form |
| Water solubility | Soluble | May need a small organic co-solvent |
| Purity assessment | Chromatographic peak area | Most certificates report a percentage figure |
| Storage temperature | Minus 20 C or lower | Dry, dark, sealed container |
| Identity check | Electrospray mass spectrometry | Compared against theoretical mass |
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.
CJC-1295 is a synthetic peptide built as a long-acting analogue of growth hormone-releasing hormone. Its backbone matches the first twenty-nine residues of the natural human hormone, with four amino acid substitutions added to slow enzymatic breakdown. A reactive maleimide group, commonly termed the drug affinity complex, allows the peptide to attach to circulating albumin after administration. That albumin attachment keeps the molecule in the bloodstream for an extended period instead of being cleared within minutes.
The compound emerged from work at a Canadian biotechnology firm in the early 2000s. Early human studies examined its effect on growth hormone and insulin-like growth factor 1 in healthy volunteers and in people with HIV-associated fat redistribution. Reports described sustained increases in both markers after a single injection. Development did not advance to regulatory approval, and the clinical programme was later discontinued. The molecule is now encountered mainly as a research chemical rather than a marketed medicine.
Lyophilised powder is the usual supplied form. The material is hygroscopic, so vials are typically equilibrated to room temperature before opening in order to prevent condensation on the contents. Long-term storage is generally described at minus twenty degrees Celsius or colder, protected from light and moisture. Repeated freeze-thaw cycles are avoided because they promote aggregation and loss of soluble material. A reconstituted solution is considerably less stable than the dry powder and is normally kept refrigerated for short periods only.
Identity and purity are assessed mainly by reversed-phase high-performance liquid chromatography combined with mass spectrometry. The chromatographic separation resolves the target peptide from truncation products and from species carrying oxidised residues, while mass measurement confirms the expected molecular mass. Because the two common variants differ by roughly 280 daltons, a mass determination distinguishes them unambiguously. Purity is often quoted as a percentage of total peak area, although that figure depends on the detection wavelength and the integration method applied.
Reported half-lives differ widely between the two variants and between species. Values for the albumin-binding form are usually expressed in days, while the unconjugated form is measured in minutes to a few hours. Sampling schedules, assay sensitivity, and route of administration all influence the numbers, which limits direct comparison across studies. Whether sustained receptor occupancy produces different downstream effects from pulsatile stimulation remains an open question in the published work. Claims about relative potency should therefore be read alongside the specific study design that produced them.
=== Gray hair === Low levels of catalase may play a role in the graying process of human hair. Hydrogen peroxide is naturally produced by the body and broken down by catalase. Hydrogen peroxide can accumulate in hair follicles and if catalase levels decline, this buildup can cause oxidative stress and graying. These low levels of catalase are associated with old age. Hydrogen peroxide interferes with the production of melanin, the pigment that gives hair its color.
In 1977, Cuba and the Soviet Union established dozens of new training camps in Angola to accommodate PLAN and two other guerrilla movements in the region, the Zimbabwe People's Revolutionary Army (ZIPRA) and Umkhonto we Sizwe (MK). The Cubans provided instructors and specialist officers, while the Soviets provided more hardware for the guerrillas. This convergence of interests between the Cuban and Soviet military missions in Angola proved successful as it drew on each partner's comparative strengths. The Soviet Union's strength lay in its vast military industry, which furnished the raw material for bolstering FAPLA and its allies. Cuba's strength lay in its manpower and troop commitment to Angola, which included technical advisers who were familiar with the sophisticated weaponry supplied by the Soviets and possessed combat experience. In order to reduce the likelihood of a South African attack, the training camps were sited near Cuban or FAPLA military installations, with the added advantage of being able to rely on the logistical and communications infrastructure of PLAN's allies.
molecular biology The branch of biology that studies biological activity at the molecular level, in particular the various mechanisms underlying the biological processes that occur in and between cells, including the structures, properties, synthesis, and modification of biomolecules such as proteins and nucleic acids, their interactions with the chemical environment and with other biomolecules, and how these interactions explain the observations of classical biology (which in contrast studies biological systems at much larger scales). Molecular biology relies largely on laboratory techniques of physics and chemistry to manipulate and measure microscopic phenomena. It is closely related to and overlaps with the fields of cell biology, biochemistry, and molecular genetics.
generally moderately water-soluble compounds with molecular weight of 500–4000 Da with >12 phenolic hydroxyl groups with 5–7 aromatic rings per 1000 Da In terms of structures, the WBSSH recognizes two structural family that have these properties:
=== 16 May === Two people were killed in Russian attacks in Kharkiv Oblast. One person was killed in a separate attack in Kherson Oblast. Ukrainian media reported that the HUR launched a drone attack on a weapons manufacturing plant in Russia's Tula Oblast. President Zelenskyy arrived in Kharkiv to meet with the military leadership, saying that the situation in Kharkiv Oblast was "generally under control" but the area remained "extremely difficult". A police official in Kharkiv said that up to 40 civilians in Vovchansk who attempted to flee shelling were captured by Russian forces and were reportedly imprisoned in basements where they are interrogated by alleged FSB agents. According to Ukrainian Interior Minister Ihor Klymenko, Russian soldiers in Vovchansk executed a civilian prisoner after he refused to obey orders and attempted to flee. Police opened a criminal investigation on the grounds of violations of laws of war. Ukrainian soldiers in the Kharkiv front reported that they had "never seen anything close to the number of Lancets (drones) flying" compared to earlier battles. The ISW assessed that the "tempo of Russian offensive operations in the area continues to decrease".
Sources: en.wikipedia.org
== See also == Farkas, Etelka; Buglyó, Péter (2017). "Chapter 8. Lead(II) Complexes of Amino Acids, Peptides, and Other Related Ligands of Biological Interest". In Astrid, S.; Helmut, S.; Sigel, R. K. O. (eds.). Lead: Its Effects on Environment and Health. Metal Ions in Life Sciences. Vol. 17. de Gruyter. pp. 201–240. doi:10.1515/9783110434330-008. PMID 28731301. pp. 228–230 Dunaliella
Pindolol is a first generation, non-selective beta blocker in the class of β-adrenergic receptor antagonists. On the receptor level it is a competitive partial agonist. It possesses intrinsic sympathomimetic activity, meaning it has some degree of agonist effects in the absence of competing ligands. Pindolol shows membrane-stabilizing effects like quinidine, possibly accounting for its antiarrhythmic effects. It also acts as a serotonin 5-HT1A receptor partial agonist (intrinsic activity = 20–25%) or functional antagonist. The drug additionally shows affinity for the serotonin 5-HT1B receptor.
For example, enteric coatings only dissolve in the basic environment of the intestines. Drugs held in solution do not need to be dissolved before being absorbed. Lipid-soluble drugs are absorbed more rapidly than water-soluble drugs.
. R is the gas constant and T is the absolute temperature. Note that pKa = −log(Ka) and 2.303 ≈ ln(10). At 25 °C, ΔG⊖ in kJ·mol−1 ≈ 5.708 pKa (1 kJ·mol−1 = 1000 joules per mole). Free energy is made up of an enthalpy term and an entropy term.
Sources: en.wikipedia.org
=== Similar species === It can easily be mistaken for a variety of other members of the genus Tricholoma, such as T. auratum, T. aestuans, T. intermedium, T. sejunctum, and T. sulphureum. Other similar species include Floccularia albolanaripes and F. luteovirens.
In the "Documents of the First (Founding) Congress of the CLP(USNA), the preamble to the Party Program stated "Basing ourselves on the ‘Communist Manifesto’ and the ‘Program of the Communist International,’ the Marxist-Leninists of the USNA set out to rally the revolutionary working class around the following program.” In the program is the germ of the future analysis of the Party: "The trend toward shifting the economic base from mechanics to electronics has not only increased the reserve army of unemployed but also created a huge qualitatively new army of permanently unemployed, especially amongst national minority proletarians.”
==== 1.D Non-ribosomally synthesized channels ==== 1.D.1 The Gramicidin A Channel Family 1.D.2 The Channel-forming Syringomycin Family 1.D.3 The Channel-Forming Syringopeptin Family 1.D.4 The Tolaasin Channel-forming Family 1.D.5 The Alamethicin or Peptaibol Antibiotic Channel-forming Family 1.D.6 The Complexed Poly 3-Hydroxybutyrate Ca2+ Channel (cPHB-CC) Family 1.D.7 The Beticolin Family 1.D.8 The Saponin Family 1.D.9 The Polyglutamine Ion Channel (PG-IC) Family 1.D.10 The Ceramide-forming Channel Family 1.D.11 The Surfactin Family 1.D.12 The Beauvericin (Beauvericin) Family 1.D.13 DNA-delivery Amphipathic Peptide Antibiotics (DAPA) 1.D.14 The Synthetic Leu/Ser Amphipathic Channel-forming Peptide (l/S-SCP) Family 1.D.15 The Daptomycin (Daptomycin) Family 1.D.16 The Synthetic Amphipathic Pore-forming Heptapeptide (SAPH) Family 1.D.17 Combinatorially-designed, Pore-forming, β-sheet Peptide Family 1.D.18 The Pore-forming Guanosine-Bile Acid Conjugate Family 1.D.19 Ca2+ Channel-forming Drug, Digitoxin Family 1.D.20 The Pore-forming Polyene Macrolide Antibiotic/fungal Agent (PMAA) Family 1.D.21 The Lipid Nanopore (LipNP) Family 1.D.22 The Proton-Translocating Carotenoid Pigment, Zeaxanthin Family 1.D.23 Phenylene Ethynylene Pore-forming Antimicrobial (PEPA) Family 1.D.24 The Marine Sponge Polytheonamide B (pTB) Family 1.D.25 The Arylamine Foldamer (AAF) Family 1.D.26 The Dihydrodehydrodiconiferyl alcohol 9'-O-β-D-glucoside (DDDC9G) Family 1.D.27 The Thiourea isosteres Family 1.D.28 The Lipopeptaibol Family 1.D.29 The Macrocyclic Oligocholate Family 1.D.30 The Artificial Hydrazide-appended pillar[5]arene Channels (HAPA-C) Family 1.D.31 The Amphotericin B Family 1.D.32 The Pore-forming Novicidin Family 1.D.33 The Channel-forming Polytheonamide B Family 1.D.34 The Channel-forming Oligoester Bolaamphiphiles 1.D.35 The Pore-forming cyclic Lipodepsipeptide Family 1.D.36 The Oligobornene Ion Channel Family 1.D.37 The Hibicuslide C Family 1.D.38 The Cyclic Peptide Nanotube (cPepNT) Family 1.D.39 The Light-controlled Azobenzene-based Amphiphilic Molecular Ion Channel (AAM-IC) Family 1.D.40 The Protein-induced Lipid Toroidal Pore Family 1.D.41 The Sprotetonate-type Ionophore (Spirohexanolide) Family 1.D.42 The Phe-Arg Tripeptide-Pillar[5]Arene Channel (TPPA-C) Family 1.D.43 The Triazole-tailored Guanosine Dinucleoside Channel (TT-GDN-C) Family 1.D.44 The Synthetic Ion Channel with Redox-active Ferrocene (ICRF) Family 1.D.45 The Sonoporation and Electroporation Membrane Pore (SEMP) Family 1.D.46 The DNA Nanopore (DnaNP) Family 1.D.47 The Pore-forming Synthetic Cyclic Peptide (PSCP) Family 1.D.48 The Pore-forming Syringomycin E Family 1.D.49 The Transmembrane Carotenoid Radical Channel (CRC) Family 1.D.50 The Amphiphilic bis-Catechol Anion Transporter (AC-AT) Family 1.D.51 The Protein Nanopore (ProNP) Family 1.D.52 The Aromatic Oligoamide Macrocycle Nanopore (OmnNP) Family 1.D.53 The alpha, gamma-Peptide Nanotube (a,gPepNT) Family 1.D.54 The potassium-selective Hexyl-Benzoureido-15-Crown-5-Ether Ion Channel (HBEC) Family 1.D.55 The Porphyrin-based Nanopore (PorNP) Family 1.D.56 The Alpha-Aminoisobutyrate (Aib) Oligomeric Nanopore (AibNP) Family 1.D.57 The Lipid Electro-Pore (LEP) Family 1.D.58 The Anion Transporting Prodigiosene (Prodigiosene) Family 1.D.59 The Anion Transporting Perenosin (Perenosin) Family 1.D.60 The Alpha,Gamma-Cyclic Peptide (AGCP) Family 1.D.61 The Anionophoric 2,6-Bis(Benzimidazol-2-yl)Pyridine (ABBP) Family 1.D.62 The Bis-Triazolyl DiGuanosine Derivative Channel-forming (TDG) Family 1.D.63 The Peptide-based Nanopore (PepNP) Family 1.D.64 The Carbon Nanotube (CarNT) Family 1.D.65 The Pore-forming Amphidinol (Amphidinol) Family 1.D.66 The Helical Macromolecule Nanopore (HmmNP) Family 1.D.67 The Crown Ether-modified Helical Peptide Ion Channel (CEHP) Family 1.D.68 The Pore-forming Pleuronic Block Polymer (PPBP) Family 1.D.69 The Conical Nanopore (ConNP) Family 1.D.70 The Metallic (Au/Ag/Pt/graphene) Nanopore (MetNP) Family 1.D.71 The Synthetic TP359 Peptide (TP359) Family 1.D.72 The Chloride Carrier Triazine-based Tripodal Receptor (CCTTR) Family 1.D.73 The Mesoporous Silica Nanopore (SilNP) Family 1.D.74 The Stimulus-responsive Synthetic Rigid p-Octiphenyl Stave Pore (SSROP) Family
Sources: en.wikipedia.org
The mass difference from the linker is large enough for routine detection by mass spectrometry. The unconjugated form gives a single sharp signal at its expected weight. Material that has already reacted with albumin shows a much higher mass and a broadened chromatographic peak.
Yes. Degradation proceeds faster once the powder is dissolved, especially at room temperature or after multiple freeze and thaw cycles. Working solutions are often aliquoted to avoid repeated handling. Lyophilized powder held cold and dry retains its properties far longer.
Truncated sequences, oxidized residues and aggregated forms can all elute near the main peak. Reversed phase chromatography resolves many of these species, so the number of peaks is a useful indicator of synthesis quality. A single peak does not by itself prove correct sequence, which is why mass confirmation is paired with it.
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.