Entry and processing of Borrelia burgdorferi pleomorphic forms

Lymen borrelioosi on Suomessakin yleinen puutiaisten levittämä tauti. Borrelioosin ensimmäisiä oireita ovat muun muassa puutiaisen pureman ympärille muodostuva ihottuma, päänsärky, väsymys ja kuume. Myöhemmin tauti voi aiheuttaa nivel- tai sydäntulehduksen sekä neurologisia oireita. Borrelioosi on m...

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Main Author: Brander, Heini
Other Authors: Matemaattis-luonnontieteellinen tiedekunta, Faculty of Sciences, Bio- ja ympäristötieteiden laitos, Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylän yliopisto
Format: Master's thesis
Language:eng
Published: 2015
Subjects:
Online Access: https://jyx.jyu.fi/handle/123456789/47084
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author Brander, Heini
author2 Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science University of Jyväskylä Jyväskylän yliopisto
author_facet Brander, Heini Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science University of Jyväskylä Jyväskylän yliopisto Brander, Heini Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science University of Jyväskylä Jyväskylän yliopisto
author_sort Brander, Heini
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description Lymen borrelioosi on Suomessakin yleinen puutiaisten levittämä tauti. Borrelioosin ensimmäisiä oireita ovat muun muassa puutiaisen pureman ympärille muodostuva ihottuma, päänsärky, väsymys ja kuume. Myöhemmin tauti voi aiheuttaa nivel- tai sydäntulehduksen sekä neurologisia oireita. Borrelioosi on monessa suhteessa kiistanalainen tauti, sillä esimerkiksi sen hoidosta ja mahdollisesta kroonistumisesta on kaksi eriävää näkemystä. Taudin aiheuttaja on Borrelia burgdorferi -bakteeri (Bb). Bb pystyy välttelemään isännän immuunipuolustusta useilla eri mekanismeilla. Bakteeri on korkkiruuvinmuotoinen spirokeetta, mutta voi esiintyä myös epätyypillisinä muotoina, joihin kuuluu esimerkiksi pyöreä muoto (RB; engl. round body). Hypoteesina oli, että RB aiheuttaa erilaisen immuunivasteen kuin spirokeetta mahdollisesti siten vaikuttaen taudin kroonistumiseen. Tutkimuksessa verrattiin Bb:n eri muotojen fagosytoosia sekä prosessointia makrofageissa immunoleimaamalla syöjäsoluista aktiini, lysosomit sekä endoplasmakalvosto. Konfokaalimikroskooppikuvista tutkittiin kolokalisaatioanalyysilla sijaitseeko soluun sisäänotettu Bb samassa kohdassa kuin nämä soluelimet. Lisäksi tutkittiin luonnollisen ja hankitun immuniteetin yhdistäviä dendriittisoluja. Dendriittisolujen kypsyminen varmistettiin ensin virtaussytometrillä, jonka jälkeen soluja stimuloitiin Bb:n eri muodoilla. Tämän jälkeen stimuloitujen solujen erittämät sytokiinit analysoitiin. Sytokiinit ohjaavat immuunivasteen kehitystä kiihdyttäen tai estäen sen muodostumista. Tutkimuksen tuloksena todettiin, että molemmat muodot kolokalisoivat aktiinin kanssa todennäköisesti fagosytoosin aikana. Spirokeetat kolokalisoivat useammin lysosomien kanssa kuin RB:t. Spirokeettoja on aiemmin havaittu solulimassa, mutta näiden tulosten perusteella RB:t joutuvat spirokeettoja useammin lysosomien ulkopuolisen hajotuksen kohteeksi. Endoplasmakalvoston ja Bb:n vähäisestä kolokalisaatiosta ei voitu vetää johtopäätöksiä, koska varsinaisen signaalin erottaminen taustasta oli mahdotonta. Sen vuoksi bakteerin antigeenien mahdollinen esittely samaa reittiä kuin virusproteiinit jäi yhä selvittämättä. Dendriittisolujen kyspsymisprotokolla ei tuottanut haluttua tulosta, vaan vain 10 % soluista kypsyi. Dendriittisolujen tuottamissa sytokiineissa näkyi määrällisiä eroja esimerkikisi interleukiini 8, CCL2 ja CCL5:n kohdalla, mutta niiden merkitsevyyttä ei voida todeta toistamatta koetta. Bb:n spirokeetta- ja RB-muotojen prosessointien välillä immuunisoluissa vaikuttaa olevan eroja, jotka kuitenkin vaativat lisätutkimuksia. Mahdollisesti RB-muodon erilainen immuunivaste on yhteydessä kroonisen borrelioosin kehittymiseen. Lyme disease is a tick-borne disease also encountered in Finland. Common symptoms of Lyme disease are erythema migrans –skin lesion, headache, fatigue, and fever. Possible symptoms in the late stage of the disease are arthritis, carditis, and neuroborreliosis. The causative agent is a spirochete called Borrelia burgdorferi (Bb). Bb has multiple methods to evade host immunity, and many aspects of host immune response to Bb are not yet examined. The disease is a subject of a great controversy. Particularly the possibility of a chronic Borrelia infection is under debate. Bb can alter its shape and transform into a round body (RB) form, which has been suggested to play a role in chronic disease. Phagocytic cells play a significant role in clearing an infection as well as activating other aspects of immunity. Here, actin, lysosomes and endoplasmic reticulum (ER) were immunolabeled in macrophages, and their colocalization with internalized spirochetes or RBs was analyzed based on confocal microscopic images. Dendritic cells are antigen-presenting cells and the main link between innate and adaptive immunity. First, a dendritic cell maturation protocol was developed and then cells were stimulated with either spirochetes or RBs. Cytokines excreted by stimulated dendritic cells were analyzed. As a result, actin colocalization with both forms was equal suggesting that actin is used in the phagocytosis of both forms. Spirochetes colocalized more with lysosomes than RBs. Spirochetes are reported to be degraded not only in lysosomes but also in the cytosol. These results suggested that RBs are degraded more often in the cytosol. Low colocalization of either form with ER led to the conclusion that another method is required to study possible major histocompatibility complex class I antigen presentation. The dendritic cell maturation protocol did not produce as high maturation rate as pursued. However, some differences in cytokine secretion were detected between spirochetes and RBs. For example, interleukin 8, CCL2 and CCL5 had an increased production by RB stimulation. In conclusion, these results indicate a difference between spirochete and RB processing in immune cells that may cause separate immune responses. Nevertheless, further studies are required to obtain more information on the significance of the differences. Perhaps, RBs can provide an explanation for the pathogenesis behind chronic Lyme disease.
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Borrelioosin ensimm\u00e4isi\u00e4 oireita ovat muun muassa puutiaisen pureman ymp\u00e4rille muodostuva ihottuma, p\u00e4\u00e4ns\u00e4rky, v\u00e4symys ja kuume. My\u00f6hemmin tauti voi aiheuttaa nivel- tai syd\u00e4ntulehduksen sek\u00e4 neurologisia oireita. Borrelioosi on monessa suhteessa kiistanalainen tauti, sill\u00e4 esimerkiksi sen hoidosta ja mahdollisesta kroonistumisesta on kaksi eri\u00e4v\u00e4\u00e4 n\u00e4kemyst\u00e4. Taudin aiheuttaja on Borrelia burgdorferi -bakteeri (Bb). Bb pystyy v\u00e4lttelem\u00e4\u00e4n is\u00e4nn\u00e4n\nimmuunipuolustusta useilla eri mekanismeilla. Bakteeri on korkkiruuvinmuotoinen spirokeetta, mutta voi esiinty\u00e4 my\u00f6s ep\u00e4tyypillisin\u00e4 muotoina, joihin kuuluu esimerkiksi py\u00f6re\u00e4 muoto (RB; engl. round body). Hypoteesina oli, ett\u00e4 RB aiheuttaa erilaisen immuunivasteen kuin spirokeetta mahdollisesti siten vaikuttaen taudin kroonistumiseen. Tutkimuksessa verrattiin Bb:n eri muotojen fagosytoosia sek\u00e4 prosessointia makrofageissa immunoleimaamalla sy\u00f6j\u00e4soluista aktiini, lysosomit sek\u00e4 endoplasmakalvosto. Konfokaalimikroskooppikuvista tutkittiin kolokalisaatioanalyysilla sijaitseeko soluun sis\u00e4\u00e4notettu Bb samassa kohdassa kuin n\u00e4m\u00e4 soluelimet. Lis\u00e4ksi tutkittiin luonnollisen ja hankitun immuniteetin yhdist\u00e4vi\u00e4\ndendriittisoluja. Dendriittisolujen kypsyminen varmistettiin ensin virtaussytometrill\u00e4, jonka j\u00e4lkeen soluja stimuloitiin Bb:n eri muodoilla. T\u00e4m\u00e4n j\u00e4lkeen stimuloitujen solujen eritt\u00e4m\u00e4t sytokiinit analysoitiin. Sytokiinit ohjaavat immuunivasteen kehityst\u00e4 kiihdytt\u00e4en tai est\u00e4en sen muodostumista. Tutkimuksen tuloksena todettiin, ett\u00e4 molemmat muodot kolokalisoivat aktiinin kanssa todenn\u00e4k\u00f6isesti fagosytoosin aikana. Spirokeetat kolokalisoivat useammin lysosomien kanssa kuin RB:t. Spirokeettoja on aiemmin havaittu solulimassa, mutta n\u00e4iden tulosten perusteella RB:t joutuvat spirokeettoja useammin lysosomien ulkopuolisen hajotuksen kohteeksi. Endoplasmakalvoston ja Bb:n v\u00e4h\u00e4isest\u00e4 kolokalisaatiosta ei voitu vet\u00e4\u00e4 johtop\u00e4\u00e4t\u00f6ksi\u00e4, koska varsinaisen signaalin erottaminen taustasta oli mahdotonta. Sen vuoksi bakteerin antigeenien mahdollinen esittely samaa reitti\u00e4 kuin virusproteiinit j\u00e4i yh\u00e4 selvitt\u00e4m\u00e4tt\u00e4. Dendriittisolujen kyspsymisprotokolla ei tuottanut haluttua tulosta, vaan vain 10 % soluista kypsyi. Dendriittisolujen tuottamissa sytokiineissa n\u00e4kyi m\u00e4\u00e4r\u00e4llisi\u00e4 eroja esimerkikisi interleukiini 8, CCL2 ja CCL5:n kohdalla,\nmutta niiden merkitsevyytt\u00e4 ei voida todeta toistamatta koetta. Bb:n spirokeetta- ja RB-muotojen prosessointien v\u00e4lill\u00e4 immuunisoluissa vaikuttaa olevan eroja, jotka kuitenkin vaativat lis\u00e4tutkimuksia. 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Phagocytic cells play a significant role in clearing an infection as well as activating other aspects of immunity. Here, actin, lysosomes and endoplasmic reticulum (ER) were immunolabeled in macrophages, and their colocalization with internalized spirochetes or RBs was analyzed based on confocal microscopic images. Dendritic cells are antigen-presenting cells and the main link between innate and adaptive immunity. First, a dendritic cell maturation protocol was developed and then cells were stimulated with either spirochetes or RBs. Cytokines excreted by stimulated dendritic cells were analyzed. As a result, actin colocalization with both forms was equal suggesting that actin is used in the phagocytosis of both forms. Spirochetes colocalized more with lysosomes than RBs. Spirochetes are reported to be degraded not only in lysosomes but also in the cytosol. These results suggested that RBs are degraded more often in the cytosol. 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spellingShingle Brander, Heini Entry and processing of Borrelia burgdorferi pleomorphic forms Lyme disease Borrelia burgdorferi Round body macrophage colocalization dendritic cell Solu- ja molekyylibiologia Cell and molecular biology 4013 borrelioosi makrofagit Lymen borrelioosi solut
title Entry and processing of Borrelia burgdorferi pleomorphic forms
title_full Entry and processing of Borrelia burgdorferi pleomorphic forms
title_fullStr Entry and processing of Borrelia burgdorferi pleomorphic forms Entry and processing of Borrelia burgdorferi pleomorphic forms
title_full_unstemmed Entry and processing of Borrelia burgdorferi pleomorphic forms Entry and processing of Borrelia burgdorferi pleomorphic forms
title_short Entry and processing of Borrelia burgdorferi pleomorphic forms
title_sort entry and processing of borrelia burgdorferi pleomorphic forms
title_txtP Entry and processing of Borrelia burgdorferi pleomorphic forms
topic Lyme disease Borrelia burgdorferi Round body macrophage colocalization dendritic cell Solu- ja molekyylibiologia Cell and molecular biology 4013 borrelioosi makrofagit Lymen borrelioosi solut
topic_facet 4013 Borrelia burgdorferi Cell and molecular biology Lyme disease Lymen borrelioosi Round body Solu- ja molekyylibiologia borrelioosi colocalization dendritic cell macrophage makrofagit solut
url https://jyx.jyu.fi/handle/123456789/47084 http://www.urn.fi/URN:NBN:fi:jyu-201509183144
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