Omega-3 fedtsyren DHA er giftig for kræftceller

- og nyt potentiale i forebyggelse og behandling

Omega-3 fedtsyren DHA er giftig for kræftcellerDet er almindelig kendt, at omega-3 fedtsyrerne indgår i mange livsvigtige funktioner. Omega-3 fedtsyren DHA kan tilmed få kræftceller til at forgifte sig selv, fordi de ikke kan opbevare fedtsyren korrekt. Det fremgår af et nyt belgisk studie publiceret i Cell Metabolism, hvor forfatterne afklarer de nærmere mekanismer. Samtidig påpeger forfatterne, at tilskud med omega-3 fedtsyrer kan være relevant i kræftbehandlingen, da det gennemsnitlige indtag gennem kosten er alt for lille, og der er fare for udvikling af resistens over for lægemidler. Det nye studie kaster i det hele taget nyt lys over omega-3 fedtsyrernes kræfthæmmende virkninger.

Omega-3 fedtsyrerne er nogle livsvigtige, flerumættede fedtsyrer. Formerne DHA og EPA findes i cellernes membraner, hvor de indgår i et hav af biokemiske processer. Det er almindelig kendt, at DHA (docosahexaensyre) har særlig stor betydning for hjernen, øjne, syn og regulering af inflammationer. Derudover ser det nu ud til, at DHA hænger sammen med nedsat risiko for udvikling af kræft.
Et forskerteam fra Université catholique de Louvain i Belgien har netop afklaret de biokemiske mekanismer, som gør, at DHA hæmmer udviklingen af kræftceller og tumorer.
Forskerteamet er specialiseret i onkologi, og i 2016 fandt de ud af, at kræftceller i et surt mikromiljø (acidose) erstatter glukose med fedtstoffer som energikilde, når de skal dele sig.
I 2020 demonstrerede forskerne, at de samme celler er de mest aggressive, hvad angår evnen til at forlade den oprindelige tumor og generere metastaser andre steder. Dette førte til et større samarbejde med et forskerteam fra samme universitet. Dette forskerteam var tilknyttet fakultetet for Bioengineering, hvor de udviklede bedre fødekilder med fedtstoffer. Formålet med samarbejdet var så at afklare, hvordan kræftceller i tumorer opfører sig under påvirkning af forskellige fedtsyrer.

Kræftcellers indhold af DHA gør dem sårbare over for frie radikaler

Forskerne fandt hurtigt ud af, at kræftceller i det sure mikromiljø (acidose) kunne reagere helt modsat, afhængig af hvilken fedtsyre, som de absorberede. I løbet af få uger fandt forskerne ud af, at nogle fedtsyrer stimulerede tumorcellerne til vækst, mens andre slog dem ihjel. Og det var DHA, som slog kræftcellerne ihjel ved at forgifte dem.
Måden hvorpå DHA forgifter kræftcellerne, er via et fænomen, som hedder ferroptosis. Det er en form for programmeret celledød, som er afhængig af jern, og som skyldes frie radikaler. Der er samtidig fejl i kræftcellens antioxidantforsvar.
Når frie iltradikaler angriber de flerumættede fedtsyrer i cellemembranen, starter de farlige kædereaktioner, som spreder sig gennem cellen. Fænomenet hedder lipidperoxidation eller harskning. Og det svarer til smør, der ilter og bliver harsk, hvis det står for længe fremme.
Det nye studie afslørede, at jo større mængden af flerumættede fedtsyrer er i en kræftcelle, jo større er risikoen for, at kræftcellen oxiderer og tager skade.
Normalt vil kræftcellerne i tumorer lagre de flerumættede fedtsyrer i nogle små dråber, som beskytter dem mod frie radikaler og oxidation. Men hvis der er store mængder DHA i en kræftcelle, bliver den nærmest oversvømmet, så den ikke kan lagre fedtsyrerne i de små beskyttende dråber. Dette fører til lipidperoxidation i kræftcellen og en række kædereaktioner, som fører til kræftcellens død. Fænomenet sker altså, når kræftcellen ikke kan regulere det øgede optag af DHA og derved bliver sårbar over for frie radikaler.
Forskerne fandt desuden, at mus signifikant fik forsinket udviklingen af deres kræfttumorer, når de fik en diæt, som var rig på omega-3.
De nye data indikerer derfor, at flere omega-3 fedtsyrer gennem kost eller tilskud kan være oplagt som led i kræftbehandlingen.
Det nye studie er publiceret i Cell Metabolism.

Hvordan får vi nok omega-3 og DHA?

Gennem millioner af år har vores forfædre indtaget en del omega-3 fedtsyrer gennem fed fisk, skaldyr og andre maritime kilder, som indeholder formerne DHA og EPA. Men indtaget af omega-3 fedtsyrer er faldet drastisk i nyere tid grundet ændrede spisevaner og unaturligt dyrefoder, som afspejler sig i fisk, kød og æg.
Ifølge forskerne bag det nye belgiske studie får vi i det hele taget for lidt omega-3 og i gennemsnit kun omkring 50-100 mg DHA om dagen. Derfor anbefaler forskerne, at vi minimum får 250 mg DHA om dagen. Man kan for eksempel få omkring 250 mg EPA ved at spise en makrelmad, en sildemad, 50 gram opdrættet laks eller 125 gram kogte rejer.
Hvis man ikke kan lide fisk og skaldyr eller bare spiser for lidt, er det oplagt med fiskeolietilskud af en god kvalitet. På varedeklarationen står der, hvor meget DHA og EPA, som en kapsel indeholder.

Omega-3 kan forhindre vækst og spredning af brystkræftceller

Hver niende danske kvinde rammes af brystkræft, og kosten spiller en stor rolle. Ifølge et amerikansk studie, som tidligere er omtalt på denne hjemmeside, kan omega-3 fedtsyrerne undertrykke vækst og spredning af brystkræftceller. Ifølge studiets leder Saraswoti Khadge, som er tilknyttet University of Nebraska Medical Center, kan det blandt andet skyldes, at omega-3 fedtsyrerne understøtter kroppens immunforsvar og anti-inflammatoriske systemer. Så i forebyggelse og behandling af brystkræft er det vigtigt, at få nok omega-3.

Omega-3 fedtsyren EPA beskytter mod prostatakræft

Den verdensomspændende forskel i forekomsten af prostatakræft afslører, at der er tale om en livsstilssygdom. For eksempel har inuitter en meget lav forekomst af prostatakræft, som tilskrives deres høje indtag af omega-3 fedtsyrer fra sæl, laks og andre maritime kilder. Det viser sig desuden, at prostatacellers indhold af omega-3 fedtsyren EPA er afgørende for, hvorvidt sygdommen udvikler sig. Det fremgår af et studie, publiceret i Nutrients, som tidligere er omtalt på denne hjemmeside. Forskerne kommer nærmere ind på, at omega-3 fedtsyren EPA hæmmer de kroniske inflammationer, som spiller en nøglerolle i udviklingen af kræft.

Omega-3 fedtsyrernes mekanismer, der hæmmer kræft

  • Hæmmer inflammationer
  • Regulerer immunforsvaret
  • Kan få kræftceller til at forgifte sig selv via lipidperoxidation

Referencer

Will Chu. Mechanism could explain why Omega-3 fatty acid is toxic to tumor cells. NUTRAingredients.com

Emeline Dierge et al. Peroxidation of n-3 and n-6 polyunsaturated acids into acidic tumor environment leads to ferroptosis-mediated anticancer effects. Cell Metabolism 2021

Saraswoti Khadge et al. Long-chain omega-3 polysaturated fatty acids decrease mammary tumor growth, multi organ metastasis and enhance survival. 2018

Hanane Moussa et al. Omega-3 Fatty Acids Survey in Men under Active Surveillance for Prostate Cancer: from Intake to Prostate Tissue Level. Nutrients 2019

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  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `has_categories` AS `s` INNER JOIN `has_categories` AS `c` ON (`s`.`lft` < `c`.`lft` AND `c`.`lft` < `s`.`rgt` AND `c`.`language` IN (:preparedArray3,:preparedArray4)) OR (`c`.`lft` <= `s`.`lft` AND `s`.`rgt` <= `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`9.48ms3.98KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT custom_data FROM has_extensions WHERE element = 'yootheme' AND folder = 'system' LIMIT 1125μs536B/templates/yootheme/packages/platform-joomla/src/Storage.php:30Copy
  • SELECT `language`,`id` FROM `has_menu` WHERE `home` = '1' AND `published` = 1 AND `client_id` = 07.04ms704B/libraries/src/Language/Multilanguage.php:123Copy
  • SELECT `c2`.`language`,CONCAT_WS(':', `c2`.`id`, `c2`.`alias`) AS `id`,CONCAT_WS(':', `ca`.`id`, `ca`.`alias`) AS `catid` FROM `has_content` AS `c` INNER JOIN `has_associations` AS `a` ON `a`.`id` = `c`.`id` AND `a`.`context` = :context INNER JOIN `has_associations` AS `a2` ON `a`.`key` = `a2`.`key` INNER JOIN `has_content` AS `c2` ON `a2`.`id` = `c2`.`id` INNER JOIN `has_categories` AS `ca` ON `c2`.`catid` = `ca`.`id` AND `ca`.`extension` = :extension2 WHERE `c`.`id` = :id AND c2.access IN (1,5) AND c2.language != 'da-DK' AND (c2.publish_up IS NULL OR c2.publish_up <= '2025-07-11 08:23:58') AND (c2.publish_down IS NULL OR c2.publish_down >= '2025-07-11 08:23:58') AND c2.state = 1553μs1.47KBParams/libraries/src/Language/Associations.php:145Copy
  • SELECT SUM(CASE WHEN `a`.`next_execution` <= :now THEN 1 ELSE 0 END) AS due_count,SUM(CASE WHEN `a`.`locked` IS NULL THEN 0 ELSE 1 END) AS locked_count FROM `has_scheduler_tasks` AS `a` WHERE `a`.`state` = 1118μs1.37KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:466Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `has_categories` AS `s` INNER JOIN `has_categories` AS `c` ON (`s`.`lft` < `c`.`lft` AND `c`.`lft` < `s`.`rgt` AND `c`.`language` IN (:preparedArray3,:preparedArray4)) OR (`c`.`lft` <= `s`.`lft` AND `s`.`rgt` <= `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`387μs4KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT `session_id` FROM `has_session` WHERE `session_id` = ?4.96ms1KBParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:291Copy
  • UPDATE `has_session` SET `data` = ? , `time` = ? WHERE `session_id` = ?7.85ms592BParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:318Copy