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The role of Sema3A in inflammation mediated tumor progressions
KTH, School of Biotechnology (BIO).
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Sema3As roll i inflammationsmedierad tumörprogression (Swedish)
Abstract [en]

In the tumor microenvironment there are many different cell types present and among these, immune cells display a large proportion. Central players in the tumor immunity are macrophages that come in two different phenotypes, the M1 and M2 macrophages. M1 polarized macrophages are tumor suppressive while M2 polarized macrophages support tumor growth. The factors that contribute to the skewing of macrophages from one phenotype to another are under investigation. Interestingly, our lab has identified Immune Semaphorin 3A (Sema3A) as a participating plaer in regulating the accumulation of anti-tumoral M1 macrophages leading to a suppression of tumor growth.

 

In light of these data this thesis has focused on the role of endogenous Sema3A in the tumor microenvironment. A tumor cell line expressing shRNA against Sema3A mRNA was generated using lentiviral mediated gene therapy. This knockdoen cell line showed 72% lower mRNA expression compared to control and was evaluated in vivo by monitoring tumor progression in female BALB/c mice. The immune cell composition of the tumors was analysed using flow cytometry. The results from the in vivo experiment show that endogenous Sema3A has a limited effect on tumor progression. A slight shift to a more tumor supportive immune profile was observed in the knockdown tumors. Moreover, a virus for transducing cells to overecpress Sema3A under asuitable promoter for systemic delivery was generated.

Abstract [sv]

Många olika sorters celler är närvarande i tumörers mikromiljö och immunceller utgör en stor andel av dessa. Makrofager är centrala spelare o tumörimmunförsvaret och dessa kan indelas i olika aktiveringsgrader eller fenotyper, M1 eller M2 makrofager. M1 polariserade makrofager är tumörsuppressiva medan M2 makrofager bidrar till tumörtillväxt. De faktorer som reglerar skiftningen mellan M1 och M2 fenotyperna är under utredning. Vårt labb har identifierat att Immunsemaforinen 3A (Sema3A) spelar en roll i att reglera ackumuleringen av antitumorala M1 makrofager vilket leder till hämmad tumörtillväxt.

 

Med denna information som bakgrund har detta examensarbete fokuserat på Sema3As roll i tumörmikromiljön. Med hjälp av lentivirusmedierad genterapi skapades en tumörcellinje som uttrycker shRNA mot Sema3AmRNA. Denna cellinjes visade 72% lägre Sema3A mRNA uttryck jämfört med kontorll och utvärderades sedan in vivo genom att följa tumörtillväxten i BALB/c mushonor. Immuncellsammansättningen i tumörerna analyserades sedan med hjälp av flödescytometri. Resultaten från in vivo experimentet visar att endogent Sema3A har en begränsad effekt på tumörutvecklingen. En något mer tumörgynnande immunprofil observerades i de tumörer där Sema3A uttryck var minskat. Utöver detta skapades också ett lentivirus för att transducera celler så att de överuttrycker Sema3A under en passande promotor för systemisk tillförsel.

Place, publisher, year, edition, pages
2015.
Keyword [en]
macrophage, T-cells, Tumor ummunology, angiogenesis
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-172790OAI: oai:DiVA.org:kth-172790DiVA: diva2:849535
Supervisors
Examiners
Available from: 2015-09-08 Created: 2015-08-28 Last updated: 2015-09-08Bibliographically approved

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