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Purity: ≥98%
Caerulein (Caerulein; Cerulein; FI-6934) is a novel, potent and specific decapeptide-based cholecystokinin receptor agonist, it is produced in the skin of Hila caerulea, an Australian amphibian. Caerulein and Cholecytokinin function and are composed similarly. It increases the secretion of pancreatic, biliary, and stomach juices as well as some smooth muscle. It is a diagnostic tool for pancreatic dysfunction and for paralytic ileus.
| Targets |
CCK receptor
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|---|---|
| ln Vitro |
CeruLetide chemically and biologically interacts with the human gastrointestinal tract cholecystokinin-cholecystin (CCK) and gastrin II profiles. CeruLetide stimulates gallbladder contractions, extrapancreatic, gastric fluid and motility in the ICU duodenum, jejunum, ileum and sleep, while delaying gastric emptying and inhibiting motility in the proximal duodenum [1]. CeruLetide activates NF-kappaB/Rel in vitro at minimal physiological doses. This activation may induce a genetic program of self-defense before cellular damage occurs, which may terminate the higher degree of damage to pancreatic alveolar cells that occurs after chronic stress overstress [2].
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| ln Vivo |
Ceruletide can be used in animal modeling to construct animal pancreatitis models. CeruLetide (0.4-0.5 μg/kg, intravenous; 3-4 μg/kg, subcutaneous) causes vomiting and defecation in conscious intact dogs 15-30 minutes after intravenous injection and 2-4 hours after full recovery after sc administration. CeruLetide (5-15 ng/kg, iv) exhibits significant spasmogenic effects on the fecal pylorus. CeruLetide also reduces blood sugar in anesthetized dogs [1]. CeruLetide serum bile acid (SBA) stimulation circumvents the exogenous and endogenous effects associated with postprandial (PP) SBA stimulation. CeruLetide SBA stimulation may be as effective as PP SBA stimulation in dogs with cardiac portosystemic shunts (PSS) and may be more sensitive to liver dysfunction in dogs with confirmed respiratory disease (URD) [3].
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| Animal Protocol |
Dogs: Serum bile acid (SBA) stimulation is administered to all dogs using food (<5 kg/body weight [BW] 2 teaspoons, >5 kg BW 2 tablespoons) or Ceruletide IM (0.3 μg/kg BW) on consecutive days. To reduce metabolic complications such as hepatic encephalopathy, a diet high in fiber and moderate in protein is recommended. The dogs fast for twelve hours prior to each test. At baseline, 60 and 120 minutes after feeding, and 20, 30, and 40 minutes after injection, blood samples are taken, in that order. The serum is used to measure SBA by a colorimetric test with endpoint determination after the blood samples are collected in plain tubes and allowed to clot. The samples are then centrifuged at 6,500 ×g for one minute[3].
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| References |
| Molecular Formula |
C58H73N13O21S2
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|---|---|
| Molecular Weight |
1352.4047
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| Exact Mass |
1351.45
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| Elemental Analysis |
C, 51.51; H, 5.44; N, 13.46; O, 24.84; S, 4.74
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| CAS # |
17650-98-5
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| Sequence |
{pGlu}-Gln-Asp-Tyr(SO3H)-Thr-Gly-Trp-Met-Asp-Phe-NH2
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| SequenceShortening |
{pGlu}-QD-Y(SO3H)-TGWMDF-NH2
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| Appearance |
Solid powder
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| LogP |
2.46
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| tPSA |
585.080
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| SMILES |
C[C@H]([C@@H](C(=O)NCC(=O)N[C@@H](CC1=CNC2=CC=CC=C21)C(=O)N[C@@H](CCSC)C(=O)N[C@@H](CC(=O)O)C(=O)N[C@@H](CC3=CC=CC=C3)C(=O)N)NC(=O)[C@H](CC4=CC=C(C=C4)OS(=O)(=O)O)NC(=O)[C@H](CC(=O)O)NC(=O)[C@H](CCC(=O)N)NC(=O)[C@@H]5CCC(=O)N5)O
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| InChi Key |
YRALAIOMGQZKOW-HYAOXDFASA-N
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| InChi Code |
InChI=1S/C58H73N13O21S2/c1-29(72)49(71-57(87)40(23-31-12-14-33(15-13-31)92-94(89,90)91)68-56(86)43(26-48(78)79)69-52(82)37(16-18-44(59)73)65-51(81)36-17-19-45(74)63-36)58(88)62-28-46(75)64-41(24-32-27-61-35-11-7-6-10-34(32)35)54(84)66-38(20-21-93-2)53(83)70-42(25-47(76)77)55(85)67-39(50(60)80)22-30-8-4-3-5-9-30/h3-15,27,29,36-43,49,61,72H,16-26,28H2,1-2H3,(H2,59,73)(H2,60,80)(H,62,88)(H,63,74)(H,64,75)(H,65,81)(H,66,84)(H,67,85)(H,68,86)(H,69,82)(H,70,83)(H,71,87)(H,76,77)(H,78,79)(H,89,90,91)/t29-,36+,37+,38+,39+,40+,41+,42+,43+,49+/m1/s1
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| Chemical Name |
(3S)-3-[[(2S)-5-amino-5-oxo-2-[[(2S)-5-oxopyrrolidine-2-carbonyl]amino]pentanoyl]amino]-4-[[(2S)-1-[[(2S,3R)-1-[[2-[[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-1-amino-1-oxo-3-phenylpropan-2-yl]amino]-3-carboxy-1-oxopropan-2-yl]amino]-4-methylsulfanyl-1-oxobutan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-2-oxoethyl]amino]-3-hydroxy-1-oxobutan-2-yl]amino]-1-oxo-3-(4-sulfooxyphenyl)propan-2-yl]amino]-4-oxobutanoic acid
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| Synonyms |
Caerulein; Cerulein; FI-6934; FI 6934; FI6934
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| HS Tariff Code |
2934.99.9001
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| Storage |
Powder -20°C 3 years 4°C 2 years In solvent -80°C 6 months -20°C 1 month |
| Shipping Condition |
Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)
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| Solubility (In Vitro) |
DMSO: ~100 mg/mL (~73.9 mM)
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|---|---|
| Solubility (In Vivo) |
Solubility in Formulation 1: ≥ 1.67 mg/mL (1.23 mM) (saturation unknown) in 10% DMF 40% PEG300 + 5% Tween80 + 45% Saline (add these co-solvents sequentially from left to right, and one by one), clear solution.
Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH₂ O to obtain a clear solution. Solubility in Formulation 2: ≥ 1.67 mg/mL (1.23 mM) (saturation unknown) in 10% DMF 90% (20% SBE-β-CD in Saline) (add these co-solvents sequentially from left to right, and one by one), clear solution. Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution. View More
Solubility in Formulation 3: 1.67 mg/mL (1.23 mM) in 10% DMF 90% Corn Oil (add these co-solvents sequentially from left to right, and one by one), suspension solution; with ultrasonication. Solubility in Formulation 4: 5%DMSO + 40%PEG300 + 5%Tween 80 + 50%ddH2O: 2.5mg/ml (1.85mM) Solubility in Formulation 5: 30.3 mg/mL (22.40 mM) in PBS (add these co-solvents sequentially from left to right, and one by one), clear solution; with ultrasonication. Solubility in Formulation 6: 2 mg/mL (1.48 mM) in Saline (add these co-solvents sequentially from left to right, and one by one), clear solution; Need ultrasonic and adjust pH to 12 with 1M NaOH. Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH₂ O to obtain a clear solution. |
| Preparing Stock Solutions | 1 mg | 5 mg | 10 mg | |
| 1 mM | 0.7394 mL | 3.6971 mL | 7.3942 mL | |
| 5 mM | 0.1479 mL | 0.7394 mL | 1.4788 mL | |
| 10 mM | 0.0739 mL | 0.3697 mL | 0.7394 mL |
*Note: Please select an appropriate solvent for the preparation of stock solution based on your experiment needs. For most products, DMSO can be used for preparing stock solutions (e.g. 5 mM, 10 mM, or 20 mM concentration); some products with high aqueous solubility may be dissolved in water directly. Solubility information is available at the above Solubility Data section. Once the stock solution is prepared, aliquot it to routine usage volumes and store at -20°C or -80°C. Avoid repeated freeze and thaw cycles.
Calculation results
Working concentration： mg/mL；
Method for preparing DMSO stock solution： mg drug pre-dissolved in μL DMSO (stock solution concentration mg/mL). Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug.
Method for preparing in vivo formulation:：Take μL DMSO stock solution, next add μL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH2O，mix and clarify.
(1) Please be sure that the solution is clear before the addition of next solvent. Dissolution methods like vortex, ultrasound or warming and heat may be used to aid dissolving.
(2) Be sure to add the solvent(s) in order.
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