Pröstler, Eva (2023)
The different functions of sEV-derived miR-574-5p in PGE2-dependent tumors correlate with the tetraspanin composition on the sEV envelope.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00024601
Dissertation, Erstveröffentlichung, Verlagsversion
Kurzbeschreibung (Abstract)
Small extracellular vesicles (sEV) are essential for intracellular communication in the tumor microenvironment (TME). They can transport biological molecules, such as proteins or nucleic acids, including microRNAs (miRs), a class of short non-coding RNAs. MiRs can exert various functions in gene regulation of target cells. This work aimed to elucidate the transferability of the diverse functions of miR-574-5p to different tumor models. For this purpose, the two prostaglandin E2 (PGE2)-dependent tumor types, non-small cell lung cancer (NSCLC) and neuroblastoma (NB), were investigated. In NSCLC, miR-574-5p regulates the microsomal prostaglandin E2 synthase 1 (mPGES-1)-dependent PGE2 synthesis, which contributes to tumor progression. At the intracellular level, miR-574-5p binds to the CUG-RNA binding protein 1 (CUGBP1), thereby upregulating the synthesis of mPGES-1 and its enzymatic product PGE2. In this thesis, this function of intracellular miR-574-5p was also shown in NB with 11q deletion. Furthermore, NB cells were shown to specifically secrete miR-574-5p into their sEV upon stimulation with PGE2, similar to NSCLC cells. The autocrine role of sEV-derived miR-574-5p in mPGES-1 regulation was not confirmed in NB. However, sEV-miR-574-5p derived from NB cells was shown to exert a novel paracrine role by specific upregulation of the differentiation marker α-smooth muscle actin (α-SMA) of fibroblasts in the TME via Toll-like receptors (TLR) 7/8. Another point investigated in this study was the influence of the tetraspanins CD9, CD63, and CD81 on the functional transfer of sEV-miR-574-5p. In both tumor types, NB and NSCLC, inhibition of specific tetraspanins was shown to alter the function of sEV-miR-574-5p. A difference in the rate of internalization of sEV was excluded as the cause of this functional change. The link between tetraspanins and the functional mediation of sEV-derived miRs is a novel and promising aspect of cancer research. Overall, this work revealed a new paracrine function of sEV-miR-574-5p, regulating the α-SMA levels of fibroblasts in the TME. Furthermore, the transferability of intracellular and extracellular miR-574-5p functions to different tumor models were analyzed. The interaction of miR-574-5p and CUGBP1 was shown to be transferable from NSCLC to NB, whereas the role of sEV-derived miR-574-5p differed. Investigating the transferability of miR functions to different tumor types is an important approach to maximize the therapeutic benefit of miRs with the least effort and the greatest impact.
Typ des Eintrags: | Dissertation | ||||
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Erschienen: | 2023 | ||||
Autor(en): | Pröstler, Eva | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | The different functions of sEV-derived miR-574-5p in PGE2-dependent tumors correlate with the tetraspanin composition on the sEV envelope | ||||
Sprache: | Englisch | ||||
Referenten: | Saul, Dr. Meike Julia ; Süß, Prof. Dr. Beatrix | ||||
Publikationsjahr: | 5 Oktober 2023 | ||||
Ort: | Darmstadt | ||||
Kollation: | 123 Seiten | ||||
Datum der mündlichen Prüfung: | 22 September 2023 | ||||
DOI: | 10.26083/tuprints-00024601 | ||||
URL / URN: | https://tuprints.ulb.tu-darmstadt.de/24601 | ||||
Kurzbeschreibung (Abstract): | Small extracellular vesicles (sEV) are essential for intracellular communication in the tumor microenvironment (TME). They can transport biological molecules, such as proteins or nucleic acids, including microRNAs (miRs), a class of short non-coding RNAs. MiRs can exert various functions in gene regulation of target cells. This work aimed to elucidate the transferability of the diverse functions of miR-574-5p to different tumor models. For this purpose, the two prostaglandin E2 (PGE2)-dependent tumor types, non-small cell lung cancer (NSCLC) and neuroblastoma (NB), were investigated. In NSCLC, miR-574-5p regulates the microsomal prostaglandin E2 synthase 1 (mPGES-1)-dependent PGE2 synthesis, which contributes to tumor progression. At the intracellular level, miR-574-5p binds to the CUG-RNA binding protein 1 (CUGBP1), thereby upregulating the synthesis of mPGES-1 and its enzymatic product PGE2. In this thesis, this function of intracellular miR-574-5p was also shown in NB with 11q deletion. Furthermore, NB cells were shown to specifically secrete miR-574-5p into their sEV upon stimulation with PGE2, similar to NSCLC cells. The autocrine role of sEV-derived miR-574-5p in mPGES-1 regulation was not confirmed in NB. However, sEV-miR-574-5p derived from NB cells was shown to exert a novel paracrine role by specific upregulation of the differentiation marker α-smooth muscle actin (α-SMA) of fibroblasts in the TME via Toll-like receptors (TLR) 7/8. Another point investigated in this study was the influence of the tetraspanins CD9, CD63, and CD81 on the functional transfer of sEV-miR-574-5p. In both tumor types, NB and NSCLC, inhibition of specific tetraspanins was shown to alter the function of sEV-miR-574-5p. A difference in the rate of internalization of sEV was excluded as the cause of this functional change. The link between tetraspanins and the functional mediation of sEV-derived miRs is a novel and promising aspect of cancer research. Overall, this work revealed a new paracrine function of sEV-miR-574-5p, regulating the α-SMA levels of fibroblasts in the TME. Furthermore, the transferability of intracellular and extracellular miR-574-5p functions to different tumor models were analyzed. The interaction of miR-574-5p and CUGBP1 was shown to be transferable from NSCLC to NB, whereas the role of sEV-derived miR-574-5p differed. Investigating the transferability of miR functions to different tumor types is an important approach to maximize the therapeutic benefit of miRs with the least effort and the greatest impact. |
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Status: | Verlagsversion | ||||
URN: | urn:nbn:de:tuda-tuprints-246018 | ||||
Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 570 Biowissenschaften, Biologie | ||||
Fachbereich(e)/-gebiet(e): | 10 Fachbereich Biologie 10 Fachbereich Biologie > Extracellular vesicles / miRNA Research |
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Hinterlegungsdatum: | 05 Okt 2023 12:05 | ||||
Letzte Änderung: | 06 Okt 2023 06:30 | ||||
PPN: | |||||
Referenten: | Saul, Dr. Meike Julia ; Süß, Prof. Dr. Beatrix | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 22 September 2023 | ||||
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