Ekspresija gena za beta katenin i p53 u meningeomima

master's thesis

• Title (english): The expression of gene for beta catenin and p53 in meningioma
• Author: Monika Logara
• Mentor: Nives Pećina-Šlaus (mentor)
• Mentor: Maja Matulić (mentor)
• Committee member: Maja Matulić (predsjednik povjerenstva)
• Committee member: Duje Lisičić (član povjerenstva)
• Committee member: Martina Šeruga Musić (član povjerenstva)
• Committee member: Biljana Balen (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2015-09-25, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Meningeomi su primarni tumori središnjeg živčanog sustava. Beta-katenin je citoplazmatski protein kodiran genom CTNNB1. Sudjeluje u nastanku i održavanju međustaničnih veza i signalnom putu Wnt. Signalni put Wnt ima važnu ulogu tijekom embrionalnog razvojna, posebice razvoja središnjeg živčanog sustava. Osim stoga, neispravno funkcioniranje puta prijenosa signala Wnt odgovorno je za proces tumorigeneze. Neispravna akumulacija beta-katenina karakteristična je za različite tipove tumora. Postoje dokazi da su signalni putevi Wnt i p53 povezani te da divlji tip proteina p53 djeluje inhibitorno na Wnt signalizaciju. Željeli smo analizirati razinu izraženosti gena CTNNB1 (beta-katenin) i p53 u uzorcima meningeoma čovjeka te odrediti njihovu lokalizaciju u stanicama tumora. Također smo nastojali odrediti povezanost između ovih dvaju proteina i tako pokazati jesu li signalni putevi Wnt i p53 uključeni u nastanak meningeoma. Proteinske produkte gena CTNNB1 i p53 detektirali smo imunohistokemijom jer nam ova metoda omogućuje vizualizaciju antigena u preparatu što omogućuje samu vizualizaciju specifičnog proteina. Razinu ekspresije proteina beta-katenina i p53 odredili smo semikvantitativnom metodom tj. dodjeljivanjem znakova (+) Statističkom analizom razine ekspresije utvrdili smo da postoji inverzna korelacija izraženosti beta-katenina i p53 (P=-0,410; hi-kvadrat=0,002), što upućuje da gubitak ekspresije p53 dovodi do povišene razine beta-katenina i aktivacije signalnog puta Wnt.

Abstract (english)

Meningiomas are primary tumors of the central nervous system. Beta-catenin is a cytoplasmic protein encoded by the CTNNB1 gene, it participates in the formation and maintenance of adherens junction and Wnt signaling pathway. Wnt signaling pathway plays an important role during embryonic development, specially in the development of the central nervous system. Disruption of Wnt signaling pathway may cause cells to favor process of tumorigenesis. Aberrant accumulation of beta-catenin is characteristic for different types of tumors. There is evidence that the Wnt signaling pathways and p53 are connected, and that wild-type p53 protein acts like inhibitor of Wnt signaling. In the present study we wanted to analyze the level of expression of beta-catenin and p53 in a sample of meningioma and determine their localization in tumor cells. We also sought to determine the association between these two proteins and explore whether Wnt signaling pathways and p53 are involved in the formation of meningiomas. Beta-catenin and p53 were detected by immunohistochemistry. The statistical analysis of expression levels showed that there is an inverse correlation between beta-catenin and p53 (P =-0.410; chi-square=0.002), which indicates that loss of p53 expression leads to aberrant acumulation of beta-catenin and activation of Wnt signaling pathway.

• Keywords: p53; beta-katenin; signalni put Wnt; meninegeomi
• Keywords (english): p53; beta-catetin; Wnt signaling pathway; meningioma
• Language: croatian
• URN:NBN: urn:nbn:hr:217:879718
• 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: 2017-04-21 11:30:53