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Some facts about omega;-3 and EFAs that still need to be worked in:
Bringing up to A level:
David.Throop 04:38, 6 January 2007 (UTC) Ciar 21:33, 7 January 2007 (UTC) |
HI moderator, what the hell is up with the picture? It's completely messed up. A good diagram would succinctly illustrate the synthesis of different eicosanoids, but this really detracts from the page. Thankyou —Preceding unsigned comment added by 86.13.74.231 ( talk) 03:16, 25 July 2009 (UTC)
This article is a very good piece of work and shows a lot of research. But let me offer a correction. It repeatedly states that all eicosanoids are derived from arachadonic acid. This is incorrect.
I'm not sure about the prostacyclins and the leukotrienes. Also, arachadonic acid has other uses in the body besides eicosanoids, e.g. as a substrate for the endocannabinoids. David Throop 25 Oct 2005
Also, the article states that the eicosanoids are a class of cytokines. But the cytokine article says that cytokines are proteins. And eicosanoids aren't proteins; they don't even have any nitrogen in their structure.
David Throop 13 Nov 2005
I think that there is a third way of arachidonic acid metabolism, called epoxygenase.
This page looks good. I've never studied this topic, so there's not much that I can say about it. It might be nice to add some diagrams of molecular structures. I know that Canvas is a good program for this, but I won't be able to draw them any time soon. Do you know anything about the receptors for these hormones? I'm going on a Wiki-vacation, so I won't be available for more input for a while. Keep up the good work! AdamRetchless 08:15, 4 May 2004 (UTC)
I just wanted to say, completely out of place really, that I am totally in awe of whoever made that brilliant diagram with all the links in it. People like you are exactly what the world needs more of. Wikipedia just blows me away.
Is "that largely function as a autocrine and" supposed to refer to a chemical known as "a autocrine"? Perhaps it should be in italics -- it looks like a grammar error, but I am not sure if it is one. Cleduc 1 July 2005 19:46 (UTC)
Someone asked for cleanup, because:
This article is a very good piece of work and shows a lot of research. But let me offer a correction. It repeatedly states that all eicosanoids are derived from arachadonic acid. This is incorrect. The series-2 prostaglandins (PG) and thromboxanes (TX) are derived from arachadonic acid. The series-1 PG and TX are derived from Gamma-linoleic acid through the DGLA intermediary. The series-3 PG and TX are derived from EPA. I'm not sure about the prostacyclins and the leukotrienes. Also, arachadonic acid has other uses in the body besides eicosanoids, e.g. as a substrate for the endocannabinoids.
This article seems to be more or less accurate, but it needs to be properly referenced.-- Virulent 78 13:49, 4 February 2006 (UTC)
<SNIP!>
removed the text that just repeated what I'd said in the Comments page...
There are two diagrams (figures 1 and 2) in
that I'd really like to have for the Eicosanoid page. I've read a lot of eicosanoid papers and these are by fat the best diagrams I've seen.
They need to be updated a little – some more research has come in since they were published. Is anybody listening who is a good graphic artist and would someone like to work with me on this? – David.Throop 23:22, 10 January 2007 (UTC)
I've brought material from Essential fatty acid interactions; it's a better fit here, I think. I've put Ciar's pictures into a single figure and added captioning. I've put the list of receptors in a table, and added another table of eicosanoid medicines. Introduced a section on eicosanoids in inflammation.
I used the wikitable template, which is mostly good. But the body text runs right up against the table (in my browser, Firefox.) If anybody can jiggle the handle on the tables so they don't do that I'd be obliged. David.Throop 15:00, 13 January 2007 (UTC)
Excellent work. As a note for the future, using the Bookmarklet as detailed on this page makes adding references as easy as cut and paste. It adds into your browser as a button you can click and it pops up a window summarising the PubMed entry you are looking at in the correct format to paste into Wikipedia. TimVickers 18:08, 13 January 2007 (UTC)
Help! Near the end of the Nomenclature section, I disambiguated "cofactor" to "cofactor (biochemistry)", but we now have the phrase "protein cofactor" linking to a definition which specifically states "non-protein"! It seems to me that either the Eicosanoid page or the cofactor (biochemistry) page needs to be edited by someone with knowledge of whether cofactors can be protein or not. (perhaps the cofactor page needs to say "usually non-protein"?) -- Coppertwig 17:24, 27 January 2007 (UTC)
I find the table a little confusing. It says there are two pathways for free fatty acids, and then it says there are also additional pathways. Could it be made clear what it is about these additional pathways that precludes them from being included in the original count of two? Is it because they don't begin with free fatty acids? Is it because they involve oxygenation, while the original two perhaps don't? Is it because the first two are commonly called eicosanoids, while the others are only "technically" eicosanoids? Is it because all of the "other" pathways produce products with a number of carbon atoms not equal to 20? Any of these could be inferred from the table. Whatever is actually meant should be more clearly stated.
Also, this article should decide exactly which molecules it is or is not calling "eicosanoids". For example, in the introduction, it could say something like "x, y and z are also technically eicosanoids but, following the more common convention, will not be referred to as eicosanoids in this article." I don't much care which convention is followed in the article as long as it's clear to the reader which naming convention is being followed, and all very common conventions are mentioned in the introduction. When the "other" molecules are mentioned it could say "not classified here as eicosanoids" or "not called eicosonoids here" or "not universally referred to as eicosanoids". (sorry I can't think of a shorter phrase for that.) -- Coppertwig 14:47, 28 January 2007 (UTC)
The first two sentences of the "biosynthesis" section, and perhaps most or all of the first paragraph of the biosynthesis section, is merely a repeat of information already given in the introduction and needs to be deleted. If there is any important information in this paragraph it would be better moved elsewhere, e.g. fit it in later in the biosynthesis section or in another section; the beginning of what is now the second paragraph of the biosynthesis section would be a better lead-in to this topic. The first paragraph seems to be more about usage and breakdown than synthesis. -- Coppertwig 14:55, 28 January 2007 (UTC)
Here is an edit of the paragraph beginning "The first step...". I've attempted to improve the style (flow of language), for example trying to eliminate parentheses if possible. However, this paragraph still has this problem: animals do not have "cell walls"!!
The first step of eicosanoid biosynthesis occurs when a cell is activated by mechanical trauma, cytokines, growth factors, an eicosanoid from a neighboring cell or some other stimulus, which triggers the release of a phospholipase at the cell wall. This phospholipase (either A2 or C) travels to the nuclear membrane, where it catalyzes ester hydrolysis of a phospholipid (by A2) or of diacylglycerol (by phospholipase C). This hydrolysis reaction frees a 20-carbon essential fatty acid and appears to be the rate-determining step for eicosanoid formation.
I'm editing for clarity and flowing language here; please check that I haven't mangled the facts. -- Coppertwig 15:23, 28 January 2007 (UTC)
Woops: the second-last paragraph of the biosynthesis section (both the current version and my version above) implies that there are only two possible types of phospholipase involved, while the following paragraph says there are "several" possible types; to me "several" suggests at least three. It doesn't actually list more than two examples, though, and it also seems to say that one particular type, cPLA2, is absolutely needed, ("... devoid ...") so maybe there's really only one? Clarification needed. -- Coppertwig 16:13, 28 January 2007 (UTC)
The first sentence of the last paragraph sounds anticlimactic to me on first reading:
It seems to be saying that something which has already been positively stated earlier may be true, i.e. that "The generation of lipid hydroperoxides ... must confer a benefit". This sentence can be made stronger by increasing the emphasis on the site at which the reaction occurs. For example, by changing it to:
or "siting" or "positioning" instead of "location", etc. -- Coppertwig 16:33, 28 January 2007 (UTC)
I changed "oxidation proceeds with high stereospecificity" to "oxidation reaction introduces stereospecificity". First of all, it seems to me that a molecule is either stereospecific or it's not; the word "high" seems unnecessary. Secondly, I believe the reaction begins with two stereononspecific molecules, therefore it seems to me that the reaction ends with stereospecificity but it is not necessarily accurate to say that it "proceeds" with stereospecificity. -- Coppertwig 01:44, 2 February 2007 (UTC)
I think you've misunderstood the term 'stereospecific', it's a feature of the reaction, not the molecule. 'The reaction proceeds with great stereospecificity' means that it produces only one of the possible chiral products. If it has low stereospecificity, you get nearly a racemic mixture. Follow the link to stereospecificity for more. David.Throop 01:56, 2 February 2007 (UTC)
I drew the diagram of eicosanoid synthesis. If there are adjustments to be made, please let me know. I can also release the sxd file (OpenOffice.Org) for others to fiddle with. JFW | T@lk 20:43, 29 January 2007 (UTC)
The terminology needs to be made more clear and consistent between the paragraph and the diagram. It says "can be seen in the diagram," but I don't see in the diagram the things that are mentioned in the paragraph. The paragraph says "PGH" (what is that?); I don't see the label "PGH" in the diagram. The paragraph describes a number of molecules with rings, but two of the molecules in the diagram do not seem to have rings. Which of the molecules in the diagram are "PGH compounds"? Which are "the rest"? Which are "derived prostaglandins"? Which are "thromboxanes"? I really can't match a single molecule in the diagram to a single reference in the paragraph. The reader should be able to understand the paragraph and related diagram without having to go back and reread and study the earlier section of the article. I hope this doesn't sound too critical; I'm trying to be helpful here. -- Coppertwig 02:42, 30 January 2007 (UTC)
OK, I think I can mostly fix this, but someone will have to check that I haven't mangled any of the science. It said:
I'm changing it to:
My purpose here is to make the paragraph seem to match what is shown in the figure. If I understand this paragraph correctly, PGH compounds (not shown in the figure) have an oxygen bridge in the ring, while prostaglandins do not. Please check that the paragraph as I've edited it has not become incorrect. -- Coppertwig 02:08, 2 February 2007 (UTC)
Someone mentioned above that arachidonic acid is not the only source of eicosanoids. The first diagram at the top of the article shows only arachidonic acid, so maybe it needs to be changed (or labelled as being an example). -- Coppertwig 02:45, 30 January 2007 (UTC)
Changing the reference style has greatly improved the page. I have added the following:
<div class="references-small" style="-moz-column-count:2; column-count:2;"> <references/> </div>
To convert from single-column to two-column format (it looks much nicer) but alas this will not display as such in every browser. (I believe it works in Firefox). If someone knows how to make it display in two columns in all browsers, please tell me how! Thanks in advance István 17:48, 30 January 2007 (UTC)
The reduction in AA-derived eicosanoids and the diminished activity of the alternative products generated from ω-3 fatty acids serve as the foundation for explaining some of the beneficial effects of greater ω-3 intake.
Is this right? It sounds right that "the reduction in AA-derived eicosanoids" is an explanation for the beneficial effects of omega-3 intake. But it sounds wrong to me that "the diminished activity of the alternative products generated from ω-3 fatty acids" would serve as an explanation. I would expect increased omega-3 intake to produce an increased, not diminished, activity of "the alternative products generated from ω-3 fatty acids". -- Coppertwig 01:44, 31 January 2007 (UTC)
Looking at the changes for the last day in this section, I'm concerned that it's become much more tentative.
This is wordier and weaker in places. Common usage is 'omega-3 fats', not 'omega-3 fatty acids' and in the diet, people aren't eating fatty acids, they're eating fat. The eicosanoids aren't just one explanation of some of the beneficial effects; they're the foundation
I think 'serve as the foundation' is stronger, and justified by the references. David.Throop 19:58, 1 February 2007 (UTC)
Perhaps there are three points of discussion:
1) ω-3 is more popularly recognised than is EPA which is another TLA (and there is a minor pathway of DHA>EPA back-conversion). 2) I agree with you as per your above statement, "fats" is better than "fatty acids" (and technically more correct in a dietary sense) and 3) I think its not really known for sure yet. We think its so, and I agree that current literature indicates this, but so much in the techincal literature has changed so quickly (and we still dont fully understand the mechanisms involved) that a qualified statement may be more accurate than a certain one - your call. István 20:32, 1 February 2007 (UTC)
In the introduction it says The ω-6 eicosanoids are generally pro-inflammatory; ω-3's are much less so. This introduction could give people the erroneous impression that if they want to reduce inflammation, they should stay away from both omega-3 and omega-6 fats in their diet. I think this needs to be changed, since some people will read only the introduction. It would be better to say:
The ω-6 eicosanoids are generally pro-inflammatory; ω-3's tend to counter them. Or it can say "compete with" or "can soften their effects" or something rather than "counter". -- Coppertwig 16:28, 5 February 2007 (UTC)
Look at how I reformatted your numbered list. :-) More detail here.
When I wrote this whole paragraph, it was more or less a direct quote from Fritsche. Maybe I should just quote him directly. There's a quotation template that I'm looking around for... 01:01, 2 February 2007 (UTC)
Some readers' eyes will glaze over when they come to the "Biosynthesis of leukotrienes", if not earlier. I don't suggest deleting any material. However, it might be helpful to put more accessible information (such as that omega-3 helps reduce inflammation -- the function and pharmacology section) earlier in the article than this challenging paragraph. Another alternative is to possibly convert the "Biosynthesis of leukotrienes" into a figure or table rather than a symbol-filled paragraph. Maybe it's OK to just leave it the way it is and hope some readers will skip the paragraph rather than throwing in the towel. -- Coppertwig 02:18, 2 February 2007 (UTC)
Istvan's suggestion of having a brief overview of Biosynthesis, and moving the more difficult material into a subarticle, seems right. But I think it still has to logically proceed the function, pharmacology and effects. David.Throop 04:12, 2 February 2007 (UTC)
In the first paragraph:
I suggest adding at least one or two sentences between the first and second sentence and at least another one or two between the second and third, if appropriate information can be found, splitting into more than one paragraph if necessary. This would serve two purposes: first, to make this part longer than the corresponding part of the introduction which should logically be a mere summary of it; secondly, to guide the reader in the flow of ideas from one of these sentences to the next. Each of these sentences seems to me to be a sufficiently different topic from each other than perhaps each should be in a separate paragraph, with some other information added to fill out the paragraphs. -- Coppertwig 13:41, 2 February 2007 (UTC)
But feel free to take a swipe at it. You (or anybody else tuning in) might try reading Simopoulos and see if you could summarize what he says.
Alternatively, edit Talk:Eicosanoid/to_do. Make a list of what points should be made in the sub-section and I'll try to come up with the text. David.Throop 16:07, 2 February 2007 (UTC)
References
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After Its two letter abbreviation I suggest putting "as given above". Also, "PGI" is three letters, so maybe it should say "Its two (or sometimes three) letter abbreviation, as given above."
I just figured out that "An ABC sequence-letter" means a single letter. I had misread it as meaning a sequence of three letters. I think "A single letter" or "one letter" or "one uppercase letter" would be more clear instead. It's not clear what functional groups are referred to. For example, there is more than one functional group beginning with the letter H. When giving examples of eicosanoids at the end of the nomenclature section, I think it would be helpful to spell out the full name of at least one or perhaps all of them:
Alternatively, when the ABC sequence-letter idea is mentioned, examples of some functional groups can be given: "e.g. H for hydroxyl, A for aldehyde, ..." or whatever they actually are. -- Coppertwig 23:36, 5 February 2007 (UTC)
The comment(s) below were originally left at Talk:Eicosanoid/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
David.Throop is trying to get this article up to A-class standard, all alone. He's added a ton of info, but needs help with some things. Please check out the page!
Ciar 17:09, 13 January 2007 (UTC)
|
Last edited at 23:42, 26 January 2007 (UTC). Substituted at 14:14, 29 April 2016 (UTC)
Preferred IUPAC names are preferred systematic names of specific organic compounds when the systematic IUPAC nomenclature gives several possibilities. The name eicosanoid is a trivial name, not a name constructed according to IUPAC nomenclature (-noid is not part of IUPAC nomenclature), so the IUPAC preference of icosa- over eicosa- as a prefix meaning "twenty" is not relevant here. Therefore, I deleted the information Preferred IUPAC name: icosanoid froim the article.-- Biologos ( talk) 15:38, 27 June 2016 (UTC)
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What is GPLA? Should it be DGLA (dihomo gamma linoleic acid)? Wisapi ( talk) 21:50, 18 January 2018 (UTC)
There are statements in the introduction which require references. Around 20, by my count.
I've seen in multiple sources that Eicosanoids are classified as hormones but couldn't find any mention of that fact in this page, worth looking into
https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/eicosanoid
I'm sure there are more sources but I think those should suffice Fyukfy5 ( talk) 12:22, 29 March 2024 (UTC)
![]() | Eicosanoid received a peer review by Wikipedia editors, which is now archived. It may contain ideas you can use to improve this article. |
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Some facts about omega;-3 and EFAs that still need to be worked in:
Bringing up to A level:
David.Throop 04:38, 6 January 2007 (UTC) Ciar 21:33, 7 January 2007 (UTC) |
HI moderator, what the hell is up with the picture? It's completely messed up. A good diagram would succinctly illustrate the synthesis of different eicosanoids, but this really detracts from the page. Thankyou —Preceding unsigned comment added by 86.13.74.231 ( talk) 03:16, 25 July 2009 (UTC)
This article is a very good piece of work and shows a lot of research. But let me offer a correction. It repeatedly states that all eicosanoids are derived from arachadonic acid. This is incorrect.
I'm not sure about the prostacyclins and the leukotrienes. Also, arachadonic acid has other uses in the body besides eicosanoids, e.g. as a substrate for the endocannabinoids. David Throop 25 Oct 2005
Also, the article states that the eicosanoids are a class of cytokines. But the cytokine article says that cytokines are proteins. And eicosanoids aren't proteins; they don't even have any nitrogen in their structure.
David Throop 13 Nov 2005
I think that there is a third way of arachidonic acid metabolism, called epoxygenase.
This page looks good. I've never studied this topic, so there's not much that I can say about it. It might be nice to add some diagrams of molecular structures. I know that Canvas is a good program for this, but I won't be able to draw them any time soon. Do you know anything about the receptors for these hormones? I'm going on a Wiki-vacation, so I won't be available for more input for a while. Keep up the good work! AdamRetchless 08:15, 4 May 2004 (UTC)
I just wanted to say, completely out of place really, that I am totally in awe of whoever made that brilliant diagram with all the links in it. People like you are exactly what the world needs more of. Wikipedia just blows me away.
Is "that largely function as a autocrine and" supposed to refer to a chemical known as "a autocrine"? Perhaps it should be in italics -- it looks like a grammar error, but I am not sure if it is one. Cleduc 1 July 2005 19:46 (UTC)
Someone asked for cleanup, because:
This article is a very good piece of work and shows a lot of research. But let me offer a correction. It repeatedly states that all eicosanoids are derived from arachadonic acid. This is incorrect. The series-2 prostaglandins (PG) and thromboxanes (TX) are derived from arachadonic acid. The series-1 PG and TX are derived from Gamma-linoleic acid through the DGLA intermediary. The series-3 PG and TX are derived from EPA. I'm not sure about the prostacyclins and the leukotrienes. Also, arachadonic acid has other uses in the body besides eicosanoids, e.g. as a substrate for the endocannabinoids.
This article seems to be more or less accurate, but it needs to be properly referenced.-- Virulent 78 13:49, 4 February 2006 (UTC)
<SNIP!>
removed the text that just repeated what I'd said in the Comments page...
There are two diagrams (figures 1 and 2) in
that I'd really like to have for the Eicosanoid page. I've read a lot of eicosanoid papers and these are by fat the best diagrams I've seen.
They need to be updated a little – some more research has come in since they were published. Is anybody listening who is a good graphic artist and would someone like to work with me on this? – David.Throop 23:22, 10 January 2007 (UTC)
I've brought material from Essential fatty acid interactions; it's a better fit here, I think. I've put Ciar's pictures into a single figure and added captioning. I've put the list of receptors in a table, and added another table of eicosanoid medicines. Introduced a section on eicosanoids in inflammation.
I used the wikitable template, which is mostly good. But the body text runs right up against the table (in my browser, Firefox.) If anybody can jiggle the handle on the tables so they don't do that I'd be obliged. David.Throop 15:00, 13 January 2007 (UTC)
Excellent work. As a note for the future, using the Bookmarklet as detailed on this page makes adding references as easy as cut and paste. It adds into your browser as a button you can click and it pops up a window summarising the PubMed entry you are looking at in the correct format to paste into Wikipedia. TimVickers 18:08, 13 January 2007 (UTC)
Help! Near the end of the Nomenclature section, I disambiguated "cofactor" to "cofactor (biochemistry)", but we now have the phrase "protein cofactor" linking to a definition which specifically states "non-protein"! It seems to me that either the Eicosanoid page or the cofactor (biochemistry) page needs to be edited by someone with knowledge of whether cofactors can be protein or not. (perhaps the cofactor page needs to say "usually non-protein"?) -- Coppertwig 17:24, 27 January 2007 (UTC)
I find the table a little confusing. It says there are two pathways for free fatty acids, and then it says there are also additional pathways. Could it be made clear what it is about these additional pathways that precludes them from being included in the original count of two? Is it because they don't begin with free fatty acids? Is it because they involve oxygenation, while the original two perhaps don't? Is it because the first two are commonly called eicosanoids, while the others are only "technically" eicosanoids? Is it because all of the "other" pathways produce products with a number of carbon atoms not equal to 20? Any of these could be inferred from the table. Whatever is actually meant should be more clearly stated.
Also, this article should decide exactly which molecules it is or is not calling "eicosanoids". For example, in the introduction, it could say something like "x, y and z are also technically eicosanoids but, following the more common convention, will not be referred to as eicosanoids in this article." I don't much care which convention is followed in the article as long as it's clear to the reader which naming convention is being followed, and all very common conventions are mentioned in the introduction. When the "other" molecules are mentioned it could say "not classified here as eicosanoids" or "not called eicosonoids here" or "not universally referred to as eicosanoids". (sorry I can't think of a shorter phrase for that.) -- Coppertwig 14:47, 28 January 2007 (UTC)
The first two sentences of the "biosynthesis" section, and perhaps most or all of the first paragraph of the biosynthesis section, is merely a repeat of information already given in the introduction and needs to be deleted. If there is any important information in this paragraph it would be better moved elsewhere, e.g. fit it in later in the biosynthesis section or in another section; the beginning of what is now the second paragraph of the biosynthesis section would be a better lead-in to this topic. The first paragraph seems to be more about usage and breakdown than synthesis. -- Coppertwig 14:55, 28 January 2007 (UTC)
Here is an edit of the paragraph beginning "The first step...". I've attempted to improve the style (flow of language), for example trying to eliminate parentheses if possible. However, this paragraph still has this problem: animals do not have "cell walls"!!
The first step of eicosanoid biosynthesis occurs when a cell is activated by mechanical trauma, cytokines, growth factors, an eicosanoid from a neighboring cell or some other stimulus, which triggers the release of a phospholipase at the cell wall. This phospholipase (either A2 or C) travels to the nuclear membrane, where it catalyzes ester hydrolysis of a phospholipid (by A2) or of diacylglycerol (by phospholipase C). This hydrolysis reaction frees a 20-carbon essential fatty acid and appears to be the rate-determining step for eicosanoid formation.
I'm editing for clarity and flowing language here; please check that I haven't mangled the facts. -- Coppertwig 15:23, 28 January 2007 (UTC)
Woops: the second-last paragraph of the biosynthesis section (both the current version and my version above) implies that there are only two possible types of phospholipase involved, while the following paragraph says there are "several" possible types; to me "several" suggests at least three. It doesn't actually list more than two examples, though, and it also seems to say that one particular type, cPLA2, is absolutely needed, ("... devoid ...") so maybe there's really only one? Clarification needed. -- Coppertwig 16:13, 28 January 2007 (UTC)
The first sentence of the last paragraph sounds anticlimactic to me on first reading:
It seems to be saying that something which has already been positively stated earlier may be true, i.e. that "The generation of lipid hydroperoxides ... must confer a benefit". This sentence can be made stronger by increasing the emphasis on the site at which the reaction occurs. For example, by changing it to:
or "siting" or "positioning" instead of "location", etc. -- Coppertwig 16:33, 28 January 2007 (UTC)
I changed "oxidation proceeds with high stereospecificity" to "oxidation reaction introduces stereospecificity". First of all, it seems to me that a molecule is either stereospecific or it's not; the word "high" seems unnecessary. Secondly, I believe the reaction begins with two stereononspecific molecules, therefore it seems to me that the reaction ends with stereospecificity but it is not necessarily accurate to say that it "proceeds" with stereospecificity. -- Coppertwig 01:44, 2 February 2007 (UTC)
I think you've misunderstood the term 'stereospecific', it's a feature of the reaction, not the molecule. 'The reaction proceeds with great stereospecificity' means that it produces only one of the possible chiral products. If it has low stereospecificity, you get nearly a racemic mixture. Follow the link to stereospecificity for more. David.Throop 01:56, 2 February 2007 (UTC)
I drew the diagram of eicosanoid synthesis. If there are adjustments to be made, please let me know. I can also release the sxd file (OpenOffice.Org) for others to fiddle with. JFW | T@lk 20:43, 29 January 2007 (UTC)
The terminology needs to be made more clear and consistent between the paragraph and the diagram. It says "can be seen in the diagram," but I don't see in the diagram the things that are mentioned in the paragraph. The paragraph says "PGH" (what is that?); I don't see the label "PGH" in the diagram. The paragraph describes a number of molecules with rings, but two of the molecules in the diagram do not seem to have rings. Which of the molecules in the diagram are "PGH compounds"? Which are "the rest"? Which are "derived prostaglandins"? Which are "thromboxanes"? I really can't match a single molecule in the diagram to a single reference in the paragraph. The reader should be able to understand the paragraph and related diagram without having to go back and reread and study the earlier section of the article. I hope this doesn't sound too critical; I'm trying to be helpful here. -- Coppertwig 02:42, 30 January 2007 (UTC)
OK, I think I can mostly fix this, but someone will have to check that I haven't mangled any of the science. It said:
I'm changing it to:
My purpose here is to make the paragraph seem to match what is shown in the figure. If I understand this paragraph correctly, PGH compounds (not shown in the figure) have an oxygen bridge in the ring, while prostaglandins do not. Please check that the paragraph as I've edited it has not become incorrect. -- Coppertwig 02:08, 2 February 2007 (UTC)
Someone mentioned above that arachidonic acid is not the only source of eicosanoids. The first diagram at the top of the article shows only arachidonic acid, so maybe it needs to be changed (or labelled as being an example). -- Coppertwig 02:45, 30 January 2007 (UTC)
Changing the reference style has greatly improved the page. I have added the following:
<div class="references-small" style="-moz-column-count:2; column-count:2;"> <references/> </div>
To convert from single-column to two-column format (it looks much nicer) but alas this will not display as such in every browser. (I believe it works in Firefox). If someone knows how to make it display in two columns in all browsers, please tell me how! Thanks in advance István 17:48, 30 January 2007 (UTC)
The reduction in AA-derived eicosanoids and the diminished activity of the alternative products generated from ω-3 fatty acids serve as the foundation for explaining some of the beneficial effects of greater ω-3 intake.
Is this right? It sounds right that "the reduction in AA-derived eicosanoids" is an explanation for the beneficial effects of omega-3 intake. But it sounds wrong to me that "the diminished activity of the alternative products generated from ω-3 fatty acids" would serve as an explanation. I would expect increased omega-3 intake to produce an increased, not diminished, activity of "the alternative products generated from ω-3 fatty acids". -- Coppertwig 01:44, 31 January 2007 (UTC)
Looking at the changes for the last day in this section, I'm concerned that it's become much more tentative.
This is wordier and weaker in places. Common usage is 'omega-3 fats', not 'omega-3 fatty acids' and in the diet, people aren't eating fatty acids, they're eating fat. The eicosanoids aren't just one explanation of some of the beneficial effects; they're the foundation
I think 'serve as the foundation' is stronger, and justified by the references. David.Throop 19:58, 1 February 2007 (UTC)
Perhaps there are three points of discussion:
1) ω-3 is more popularly recognised than is EPA which is another TLA (and there is a minor pathway of DHA>EPA back-conversion). 2) I agree with you as per your above statement, "fats" is better than "fatty acids" (and technically more correct in a dietary sense) and 3) I think its not really known for sure yet. We think its so, and I agree that current literature indicates this, but so much in the techincal literature has changed so quickly (and we still dont fully understand the mechanisms involved) that a qualified statement may be more accurate than a certain one - your call. István 20:32, 1 February 2007 (UTC)
In the introduction it says The ω-6 eicosanoids are generally pro-inflammatory; ω-3's are much less so. This introduction could give people the erroneous impression that if they want to reduce inflammation, they should stay away from both omega-3 and omega-6 fats in their diet. I think this needs to be changed, since some people will read only the introduction. It would be better to say:
The ω-6 eicosanoids are generally pro-inflammatory; ω-3's tend to counter them. Or it can say "compete with" or "can soften their effects" or something rather than "counter". -- Coppertwig 16:28, 5 February 2007 (UTC)
Look at how I reformatted your numbered list. :-) More detail here.
When I wrote this whole paragraph, it was more or less a direct quote from Fritsche. Maybe I should just quote him directly. There's a quotation template that I'm looking around for... 01:01, 2 February 2007 (UTC)
Some readers' eyes will glaze over when they come to the "Biosynthesis of leukotrienes", if not earlier. I don't suggest deleting any material. However, it might be helpful to put more accessible information (such as that omega-3 helps reduce inflammation -- the function and pharmacology section) earlier in the article than this challenging paragraph. Another alternative is to possibly convert the "Biosynthesis of leukotrienes" into a figure or table rather than a symbol-filled paragraph. Maybe it's OK to just leave it the way it is and hope some readers will skip the paragraph rather than throwing in the towel. -- Coppertwig 02:18, 2 February 2007 (UTC)
Istvan's suggestion of having a brief overview of Biosynthesis, and moving the more difficult material into a subarticle, seems right. But I think it still has to logically proceed the function, pharmacology and effects. David.Throop 04:12, 2 February 2007 (UTC)
In the first paragraph:
I suggest adding at least one or two sentences between the first and second sentence and at least another one or two between the second and third, if appropriate information can be found, splitting into more than one paragraph if necessary. This would serve two purposes: first, to make this part longer than the corresponding part of the introduction which should logically be a mere summary of it; secondly, to guide the reader in the flow of ideas from one of these sentences to the next. Each of these sentences seems to me to be a sufficiently different topic from each other than perhaps each should be in a separate paragraph, with some other information added to fill out the paragraphs. -- Coppertwig 13:41, 2 February 2007 (UTC)
But feel free to take a swipe at it. You (or anybody else tuning in) might try reading Simopoulos and see if you could summarize what he says.
Alternatively, edit Talk:Eicosanoid/to_do. Make a list of what points should be made in the sub-section and I'll try to come up with the text. David.Throop 16:07, 2 February 2007 (UTC)
References
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After Its two letter abbreviation I suggest putting "as given above". Also, "PGI" is three letters, so maybe it should say "Its two (or sometimes three) letter abbreviation, as given above."
I just figured out that "An ABC sequence-letter" means a single letter. I had misread it as meaning a sequence of three letters. I think "A single letter" or "one letter" or "one uppercase letter" would be more clear instead. It's not clear what functional groups are referred to. For example, there is more than one functional group beginning with the letter H. When giving examples of eicosanoids at the end of the nomenclature section, I think it would be helpful to spell out the full name of at least one or perhaps all of them:
Alternatively, when the ABC sequence-letter idea is mentioned, examples of some functional groups can be given: "e.g. H for hydroxyl, A for aldehyde, ..." or whatever they actually are. -- Coppertwig 23:36, 5 February 2007 (UTC)
The comment(s) below were originally left at Talk:Eicosanoid/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
David.Throop is trying to get this article up to A-class standard, all alone. He's added a ton of info, but needs help with some things. Please check out the page!
Ciar 17:09, 13 January 2007 (UTC)
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Last edited at 23:42, 26 January 2007 (UTC). Substituted at 14:14, 29 April 2016 (UTC)
Preferred IUPAC names are preferred systematic names of specific organic compounds when the systematic IUPAC nomenclature gives several possibilities. The name eicosanoid is a trivial name, not a name constructed according to IUPAC nomenclature (-noid is not part of IUPAC nomenclature), so the IUPAC preference of icosa- over eicosa- as a prefix meaning "twenty" is not relevant here. Therefore, I deleted the information Preferred IUPAC name: icosanoid froim the article.-- Biologos ( talk) 15:38, 27 June 2016 (UTC)
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What is GPLA? Should it be DGLA (dihomo gamma linoleic acid)? Wisapi ( talk) 21:50, 18 January 2018 (UTC)
There are statements in the introduction which require references. Around 20, by my count.
I've seen in multiple sources that Eicosanoids are classified as hormones but couldn't find any mention of that fact in this page, worth looking into
https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/eicosanoid
I'm sure there are more sources but I think those should suffice Fyukfy5 ( talk) 12:22, 29 March 2024 (UTC)