Chemistry:Crocetin

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Short description: Carotenoid chemical compound
Crocetin[1]
Skeletal formula of crocetin
Ball and stick model of crocetin
Names
IUPAC name
8,8′-Diapocarotene-8,8′-dioic acid
Systematic IUPAC name
(2E,4E,6E,8E,10E,12E,14E)-2,6,11,15-Tetramethylhexadeca-2,4,6,8,10,12,14-heptaenedioic acid[2]
Other names
8,8'-Diapocarotenedioic acid;[1] Transcrocetinate
Identifiers
3D model (JSmol)
3DMet
1715455
ChEBI
ChEMBL
ChemSpider
EC Number
  • 248-708-0
KEGG
MeSH crocetin
UNII
Properties
C20H24O4
Molar mass 328.408 g·mol−1
Appearance Red crystals
Melting point 285 °C (545 °F; 558 K)
log P 4.312
Acidity (pKa) 4.39
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Crocetin is a natural apocarotenoid dicarboxylic acid that is found in the crocus flower together with its glycoside, crocin, and Gardenia jasminoides fruits. It is also known as crocetic acid.[3][4] It forms brick red crystals with a melting point of 285 °C.

The chemical structure of crocetin forms the central core of crocin, the compound responsible for the color of saffron. Crocetin is usually extracted commercially from gardenia fruit, due to the high cost of saffron.

Cell studies

Crocin and crocetin may provide neuroprotection in rats by reducing the production of various neurotoxic molecules, based on an in-vitro cell study.[5]

Physiological effects

A 2009 study involving 14 individuals indicated that oral administration of crocetin may decrease the effects of physical fatigue in healthy men.[6]

A 2010 pilot study investigated the effect of crocetin on sleep. The clinical trial comprised a double-blind, placebo-controlled, crossover trial of 21 healthy adult men with a mild sleep complaint. It concluded that crocetin may (p=0.025) contribute to improving the quality of sleep.[7]

In high concentrations, it has protective effects against retinal damage in vitro and in vivo.[8]

Transcrocetinate sodium

The sodium salt of crocetin, transcrocetinate sodium (INN, also known as trans sodium crocetinate or TSC) is an experimental drug that increases the movement of oxygen from red blood cells into hypoxic (oxygen-starved) tissues.[9] Transcrocetinate sodium belongs to a group of substances known as bipolar trans carotenoid salts, which constitute a subclass of oxygen diffusion-enhancing compounds.[10] Transcrocetinate sodium was one of the first such compounds discovered.[9][11]

Transcrocetinate sodium

Transcrocetinate sodium can be prepared by reacting saffron with sodium hydroxide and extracting the salt of the trans crocetin isomer from the solution.[11] John L. Gainer and colleagues have investigated the effects of transcrocetinate sodium in animal models.[11][12] They discovered that the drug could reverse the potentially fatal decrease in blood pressure produced by the loss of large volumes of blood in severe hemorrhage, and thereby improve survival.[12]

Early investigations of transcrocetinate sodium suggested that it had potential applications in battlefield medicine, specifically in treatment of the many combat casualties with hemorrhagic shock.[9][12] Additional studies, carried out in animal models, and in clinical trials in humans, indicated that transcrocetinate sodium might prove beneficial in the treatment of a variety of conditions associated with hypoxia and ischemia (a lack of oxygen reaching the tissues, usually due to a disruption in the circulatory system), including cancer, myocardial infarction (heart attack), and stroke.[9][10][13][14][15]

Transcrocetinate sodium has shown promise of effectiveness in restoring tissue oxygen levels and improving the ability to walk in a clinical trial of patients with peripheral artery disease (PAD)[14] in which reduced delivery of oxygen-rich blood to tissues can cause severe leg pain and impair mobility. The drug has also been under investigation in a clinical trial sponsored by drug developer Diffusion Pharmaceuticals for potential use as a radiosensitizer, increasing the susceptibility of hypoxic cancer cells to radiation therapy, in patients with a form of brain cancer known as glioblastoma.[15] The drug is currently under investigation for its possible use in enhancing the oxygenation status of COVID-19 patients at risk for developing multiple organ failure due to severe respiratory distress.[16]

Mechanism of action

Similar to other oxygen diffusion-enhancing compounds, transcrocetinate sodium appears to improve oxygenation in hypoxic tissues by exerting hydrophobic effects on water molecules in blood plasma and thereby increasing the hydrogen bonding between the water molecules.[17] This in turn causes the overall organization of water molecules in plasma to become more structured, which facilitates the diffusion of oxygen through plasma and promotes the movement of oxygen into tissues.[17][18][19]

Trans-crocetin has been found to act as an NMDA receptor antagonist with high affinity, and has been implicated in the psychoactivity of saffron.[20][21][22]

See also

References

  1. ↑ 1.0 1.1 Merck Index, 11th Edition, 2592
  2. ↑ CID 5281232 from PubChem
  3. ↑ "The pharmacokinetic profile of crocetin in healthy adult human volunteers after a single oral administration". Phytomedicine 18 (7): 575–8. May 2011. doi:10.1016/j.phymed.2010.10.019. PMID 21112749. 
  4. ↑ Ichi, T; Higashimura, Y; Katayama, T; Koda, T; Shimizu, T; Tada, M (1995). "Analysis of Crocetin Derivatives from Gardenia". Nippon Shokuhin Kagaku Kogaku Kaishi 42 (10): 776–783. doi:10.3136/nskkk.42.776. 
  5. ↑ "Anti-inflammatory effects of crocin and crocetin in rat brain microglial cells.". European Journal of Pharmacology 648 (1–3): 110–6. 2010. doi:10.1016/j.ejphar.2010.09.003. PMID 20854811. 
  6. ↑ "Daily oral administration of crocetin attenuates physical fatigue in human subjects". Nutrition Research 29 (3): 145–50. March 2009. doi:10.1016/j.nutres.2009.02.003. PMID 19358927. 
  7. ↑ "Effect of crocetin from Gardenia jasminoides Ellis on sleep: a pilot study". Phytomedicine 17 (11): 840–3. September 2010. doi:10.1016/j.phymed.2010.03.025. PMID 20537515. 
  8. ↑ Yamauchi, M; Tsuruma, K; Imai, S; Nakanishi, T; Umigai, N; Shimazawa, M; Hara, H (2011). "Crocetin prevents retinal degeneration induced by oxidative and endoplasmic reticulum stresses via inhibition of caspase activity". European Journal of Pharmacology 650 (1): 110–9. doi:10.1016/j.ejphar.2010.09.081. PMID 20951131. 
  9. ↑ 9.0 9.1 9.2 9.3 Gainer, J (2008). "Trans-sodium crocetinate for treating hypoxia/ischemia". Expert Opinion on Investigational Drugs 17 (6): 917–924. doi:10.1517/13543784.17.6.917. PMID 18491992. 
  10. ↑ 10.0 10.1 Gainer J, "New Class of Therapeutics that Enhance Small Molecule Diffusion", US patent 8,206,751, issued 2009-04-30
  11. ↑ 11.0 11.1 11.2 Gainer J, "Trans-sodium crocetinate, methods of making and methods of use thereof", US patent 6,060,511, issued 2000-05-09
  12. ↑ 12.0 12.1 12.2 Giassi L (2001). "Trans-Sodium Crocetinate Restores Blood Pressure, Heart Rate, and Plasma Lactate after Hemorrhagic Shock". Journal of Trauma-Injury Infection & Critical Care 51 (5): 932–938. doi:10.1097/00005373-200111000-00018. PMID 11706343. 
  13. ↑ Lapchak P (2010). "Efficacy and safety profile of the carotenoid trans sodium crocetinate administered to rabbits following multiple infarct ischemic strokes: A combination therapy study with tissue plasminogen activator". Brain Research 1309: 136–145. doi:10.1016/j.brainres.2009.10.067. PMID 19891959. 
  14. ↑ 14.0 14.1 Mohler E (2010). "Evaluation of trans sodium crocetinate on safety and exercise performance in patients with peripheral artery disease and intermittent claudication". Vascular Medicine 16 (5): 346–352. doi:10.1177/1358863X11422742. PMID 22003000. 
  15. ↑ 15.0 15.1 "Safety and Efficacy Study of Trans Sodium Crocetinate (TSC) With Concomitant Radiation Therapy and Temozolomide in Newly Diagnosed Glioblastoma (GBM)". ClinicalTrials.gov. November 2011. http://clinicaltrials.gov/ct2/show/NCT01465347?term=tsc&rank=4. 
  16. ↑ "Diffusion Pharmaceuticals Announces FDA Accelerated Review of TSC Clinical Development Plan to Treat COVID-19 Patients with ARDS". Diffusion Pharmaceuticals. May 5, 2020. https://investors.diffusionpharma.com/News/news-details/2020/Diffusion-Pharmaceuticals-Announces-FDA-Accelerated-Review-of-TSC-Clinical-Development-Plan-to-Treat-COVID-19-Patients-with-ARDS/default.aspx. 
  17. ↑ 17.0 17.1 Stennett a (2006). "Trans sodium crocetinate and diffusion enhancement". The Journal of Physical Chemistry B 110 (37): 18078–18080. doi:10.1021/jp064308+. PMID 16970413. 
  18. ↑ Laidig, K.E.; J.L. Gainer; V. Daggett (1998). "Altering Diffusivity in Biological Solutions through Modification of Solution Structure and Dynamics". Journal of the American Chemical Society 120 (36): 9394–9395. doi:10.1021/ja981656j. 
  19. ↑ Manabe H (2010). "Protection against focal ischemic injury to the brain by trans-sodium crocetinate". Journal of Neurosurgery 113 (4): 802–809. doi:10.3171/2009.10.JNS09562. PMID 19961314. 
  20. ↑ "Saffron extract and trans-crocetin inhibit glutamatergic synaptic transmission in rat cortical brain slices". Neuroscience 180: 238–47. 2011. doi:10.1016/j.neuroscience.2011.02.037. PMID 21352900. 
  21. ↑ "Effective isolation protocol for secondary metabolites from saffron: semi-preparative scale preparation of crocin-1 and trans-crocetin". Fitoterapia 92: 290–5. 2014. doi:10.1016/j.fitote.2013.11.014. PMID 24321578. 
  22. ↑ "Intestinal formation of trans-crocetin from saffron extract (Crocus sativus L.) and in vitro permeation through intestinal and blood brain barrier". Phytomedicine 22 (1): 36–44. 2015. doi:10.1016/j.phymed.2014.10.009. PMID 25636868. 



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