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5 Uppsatser om Tumör-suppressor - Sida 1 av 1
Undersökning av global epigenetisk metyleringsstatus hos juvertumörer pÄ hund :
Mammary tumors are the most frequent type of tumors in bitches in Sweden. Many
studies have been published concerning mammary tumors, but there is still much to
be learned about this disease.
One has, since some time ago, had the knowledge that addition to or removal of
methyl groups to genes can inhibit or activate gene-expression. Methylation and
demethylation is a normal phenomenon in the body and it is essential for the
development and survival of the individual. The risk of developing a tumor disease is
increased if the global methylationstatus is changed; if oncogenes demethylates
(activates) or if tumor suppressor genes methylates (inactivates). In the human
medicine one has seen that there are differences in methylationstatus between
different tumors.
In this study tumor and normal tissue from ten dogs were examined with regard to
methylationstatus.
The WT1-gene ? its role in tumourigenesis and prospects for developing a vaccine
The WT1 gene is a complex gene originally known to suppress cancer in kidneys. Studies of WT1 knockout mice have confirmed the important role of WT1 in the pathogenesis of Wilms? tumour, a tumour which counts for 95% of all childhood renal tumours. In that case the WT1 gene acts as a tumour suppressor gene. Subsequent research has shown that the WT1 gene in many other cases acts as an oncogene, e g in leukemia or lung cancer (even though these cancer forms can emerge as a result of many other aetiological factors).
The control of the cell cycle with particular emphasis on the G1/S transition
Tumour development occurs to a large extent because of dysregulation of the cell cycle. Of particular importance are defects occurring in the G1 phase. The reason why G1 is critical is because of the influence of several signals (external signals as well as cyclins and cdks) on this stage. The G1 phase can be divided into two parts, G1pm and G1ps. Each part has its ?own? restriction point which needs to be passed in order to progress to S phase.
Mus som modelldjur för mutationer i p53
p53 Àr en transkriptionsfaktor som gör att celler gÄr i apoptos eller undviker cellproliferation vid DNA-skada. Genen inhiberar bl.a. CDK-komplexet och fÄr pÄ sÄ sÀtt cellcykeln att avstanna i G1-fasen. p53 kodar ocksÄ för Bax vilket inducerar apoptos i ett flertal celltyper; samt GADD45 som Àr involverat i DNA-reparation. I normala fall finns p53-proteinet i lÄga koncentrationer i cellen pÄ grund av dess korta halveringstid (ca 20 min).
HANDSFREE-ENHET FĂR MOBIL TRYGGHETSTELEFON
Cnior Mobile AB i Lindesberg utvecklar en mobil trygghetstelefon för Àldre. Detta examensarbete gÄr ut pÄ att utforma en handsfree-enhet för denna. Handsfree-enheten ska integreras i larmknappen, som bÀrs av anvÀndaren runt handleden, och har kontakt med telefonen via blÄtandsradio. I examensarbetet ingÄr att vÀlja ut lÀmplig högtalare och mikrofon, hitta lösningar för smuts- och vattentÄlighet samt att lösa problem med ekon och bakgrundsstörningar.En högtalare hittades som uppfyllde kraven för smuts- och vattentÄlighet samtidigt som den hade utmÀrkt frekvensgÄng för Ätergivning av tydligt tal. Vattenavrinning frÄn högtalaren löstes genom att ett sinussvep sÀnds ut frÄn högtalaren varje gÄng ett samtal ska kopplas upp.