Difference between revisions of "Degradation Pathways"
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| − | |Dehydration of PGD2 to ultimatley 15d-PGJ2 occurs with a half life of about 12 hours in the presense of albumin. | + | |Dehydration of PGD2 to ultimatley 15d-PGJ2 occurs with a half life of about 12 hours in the presense of albumin (protien found in blood). |
|<ref name="Fitzpatrick1983”>[http://www.ncbi.nlm.nih.gov/pubmed/6578214 F. Fitzpatrick, "Albumin-catalyzed metabolism of prostaglandin D2. Identification of products formed in vitro." J Biol Chem. 1983 Oct 10;258(19):11713-8.]</ref> | |<ref name="Fitzpatrick1983”>[http://www.ncbi.nlm.nih.gov/pubmed/6578214 F. Fitzpatrick, "Albumin-catalyzed metabolism of prostaglandin D2. Identification of products formed in vitro." J Biol Chem. 1983 Oct 10;258(19):11713-8.]</ref> | ||
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Revision as of 14:01, 5 September 2016
Upon being transported out of the cell, the eicosanoids accumulate in the interstitial fluid, which for simplicity is referred to as the extracellular compartment in the model. A decay constant was included for each extracellular metabolite to represent degradation. To describe the breaking down of metabolites an irreversible mass action rate law was used for reactions 43-64. The half life of each eicosanoid was initially assumed as 24 hours, but will be made metabolite specific when all of the values have been collected.
| Reaction # | Species | Half Life | Rate constant | Notes | Reference |
|---|---|---|---|---|---|
| 44 | exPGF2a | 8.8 +/- 3.4 h | Study performed in decidual stromal cells and macrophages in culture. | [1] | |
| 45 | exTXB2 | 20 - 30 minutes | Quoted in a textbook(https://books.google.co.uk/books?id=_9kEeTjyJdMC&pg=PA864&lpg=PA864&dq=half+life+txa2&source=bl&ots=2OTF4Mh2Jk&sig=hu79GprliUcW4QE_Zm79islesOA&hl=en&sa=X&ved=0ahUKEwj0oo2sgfjOAhXLIcAKHcaPDHQQ6AEIRjAI#v=onepage&q=half%20life%20txa2&f=false) with no ref. | ||
| 46 | exTXA2 | 20 - 30 seconds | Quoted in a textbook(https://books.google.co.uk/books?id=_9kEeTjyJdMC&pg=PA864&lpg=PA864&dq=half+life+txa2&source=bl&ots=2OTF4Mh2Jk&sig=hu79GprliUcW4QE_Zm79islesOA&hl=en&sa=X&ved=0ahUKEwj0oo2sgfjOAhXLIcAKHcaPDHQQ6AEIRjAI#v=onepage&q=half%20life%20txa2&f=false) with no ref. | ||
| 47 | ex6-KETO-PGF2A | 3 minutes | Quoted in a textbook(https://books.google.co.uk/books?id=_9kEeTjyJdMC&pg=PA864&lpg=PA864&dq=half+life+txa2&source=bl&ots=2OTF4Mh2Jk&sig=hu79GprliUcW4QE_Zm79islesOA&hl=en&sa=X&ved=0ahUKEwj0oo2sgfjOAhXLIcAKHcaPDHQQ6AEIRjAI#v=onepage&q=half%20life%20txa2&f=false) with no ref. | ||
| 48 | exPGI2 | 42 seconds | [2] | ||
| 49 | exPGE2 | 15.0 +/- 8.2 h | Study performed in decidual stromal cells and macrophages in culture. | [1] | |
| 50 | ex15-DEOXY-PGJ2 | 12 hours | Dehydration of PGD2 to ultimatley 15d-PGJ2 occurs with a half life of about 12 hours in the presense of albumin (protien found in blood). | [3] | |
| 51 | exPGJ2 | ||||
| 52 | exPGD2 | 1.5 -1.6 minutes | Human brain | [4] | |
| 53 | exPGH2 | ||||
| 54 | ex5-OXO-ETE | ||||
| 55 | ex5-HETE | ||||
| 56 | exLTB4 | ||||
| 57 | exLTC4 | ||||
| 58 | exLTA4 | ||||
| 59 | ex5-HPETE | ||||
| 60 | ex15-HETE | ||||
| 61 | ex15-HPETE | ||||
| 62 | ex12-HETE | ||||
| 63 | ex12-HPETE | ||||
| 64 | exAA | ||||
| (-30) | kcal/mol | Unspecified | Calculations with a Gaussian98 suite of programs
Enzyme: COX (Unspecific) Substrate: Arachidonate Temperature: 298.15 K Pressure: 1 bar |
[5] |
References
- ↑ 1.0 1.1 O. Ishihara, "Differences of metabolism of prostaglandin E2 and F2 alpha by decidual stromal cells and macrophages in culture." Eicosanoids. 1991;4(4):203-7.
- ↑ Cawello W., "Metabolism and pharmacokinetics of prostaglandin E1 administered by intravenous infusion in human subjects." Eur J Clin Pharmacol. 1994;46(3):275-7.
- ↑ F. Fitzpatrick, "Albumin-catalyzed metabolism of prostaglandin D2. Identification of products formed in vitro." J Biol Chem. 1983 Oct 10;258(19):11713-8.
- ↑ Suzuki F., "Transport of prostaglandin D2 into brain." Brain Res. 1986 Oct 22;385(2):321-8.
- ↑ P. Silva, "A theoretical study of radical-only and combined radical/carbocationic mechanisms of arachidonic acid cyclooxygenation by prostaglandin H synthase" Theor Chem Acc (2003) 110: 345
