Estrogenski ili anti-estrogenski učinci ekstrakata tradicionalno korištenih tropskih biljaka na ljudske stanice U2OS

master's thesis

• Title (english): Estrogenic or anti-estrogenic effects of traditionally used tropical plant extracts on human U2OS cells
• Author: Elizabeta Zaplatić
• Mentor: Günter Vollmer (mentor)
• Mentor: Inga Marijanović (mentor)
• Committee member: Inga Marijanović (predsjednik povjerenstva)
• Committee member: Antun Alegro (član povjerenstva)
• Committee member: Domagoj Đikić (član povjerenstva)
• Committee member: Vesna Benković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2016-02-22, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Fitoestrogeni su spojevi biljnog porijekla koji, zahvaljujući strukturnoj sličnosti sa 17β-estradiolom, posjeduju mogućnost vezanja na estrogenske receptore te mogu djelovati kao njihovi agonisti i/ili antagonisti. Fitoestrogenima se pripisuju brojni zdravstveni benefiti povezani sa kardiovaskularnim bolestima, hormonski ovisnim tumorima, osteoporozom i menopauzalnim simptomima. Tropska Afrička biljka, Mondia whitei (Hook.f.) Skeels, koristi se u tradicionalnoj medicini za liječenje raznih bolesti, no njezina upotreba najčešće se spominje vezano za spolne probleme muškaraca. To ukazuje na potencijalni mehanizam djelovanja povezan sa hormonima, te su u ovom radu ispitana estrogenska i anti-estrogenska svojstva metanolskog ekstrakta Mondie whitei i njegovih frakcija. Istraživanje je uključivalo serije transaktivacijskih testova u U2OS-ERα i U2OS-ERβ stanicama. U ispitanom metanolnskom ekstraktu nije pronađena niti estrogenska niti anti-estrogenska aktivnost. Jedna frakcija ekstrakta pokazala je agonističku aktivnost u obje stanične linije, dok antiestrogenska aktivnost nije zabilježena niti u jednoj frakciji. Također, ispitana je i toksičnost biljnog ekstrakta i frakcija, no zbog nekih neočekivanih opaženih efekata, savjetuje se ponoviti MTT test. Ovaj rad izrađen je u sklopu većeg “Angola Projekta” čiji je cilj dokazati i znanstveno utemeljiti učinke biljaka korištenih u tradicionalnoj medicini.

Abstract (english)

Phytoestrogens are plant-derived compounds that, due to their structural similarity with 17β- estradiol, have an ability to bind to estrogen receptors and act as their agonists or/and antagonists. They have been reported to confer health benefits related to cardiovascular diseases, hormonedependent cancers, osteoporosis, and menopausal symptoms. A tropical African plant, Mondia whitei (Hook.f.) Skeels, is used as a traditional remedy to treat various conditions and diseases, but its use is most commonly reported in the terms of male sexual problems. This indicates potential hormonal-related mechanism of action, so this study evaluated estrogenic and anti-estrogenic properties of methanol extract of Mondia whitei and its fractions. Herbal extract and fractions were tested using estrogen receptor subtype specific transactivation assays in U2OS-ERα and U2OS-ERβ cells. In the examined methanol extract, neither estrogenic nor anti-estrogenic properties have been observed. One fraction of the extract showed agonistic activity in both cell lines, whereas none of the fractions showed anti-estrogenic potential. In addition to that, applied herbal treatments were examined for cytotoxicity, but due to some confounding effects observed, MTT assay is advised to be repeated. This study was conducted as part of the bigger project, “Angola Project”, which aims to a better, science based understanding of traditionally known medicinal uses of plants.

• Keywords: tradicionalna afrička medicina; Mondia whitei; fitoestrogeni; estrogenski receptor α; estrogenski receptor β; stanična linija osteosarkoma U2OS
• Keywords (english): traditional African medicine; Mondia whitei; phytoestrogens; estrogen receptor α; estrogen receptor β; human U2OS osteosarcoma cell line
• Language: croatian
• URN:NBN: urn:nbn:hr:217:230678
• Study programme: Title: Molecular Biology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra molekularne biologije (magistar/magistra molekularne biologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-05-12 12:12:43