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doi:10.22028/D291-38394
Titel: | Role of V-ATPase a3-Subunit in Mouse CTL Function |
VerfasserIn: | Chitirala, Praneeth Ravichandran, Keerthana Schirra, Claudia Chang, Hsin-Fang Krause, Elmar Kazmaier, Uli Lauterbach, Marcel A. Rettig, Jens |
Sprache: | Englisch |
Titel: | The Journal of Immunology |
Bandnummer: | 204 |
Heft: | 10 |
Seiten: | 2818–2828 |
Verlag/Plattform: | American Association of Immunology |
Erscheinungsjahr: | 2020 |
DDC-Sachgruppe: | 610 Medizin, Gesundheit |
Dokumenttyp: | Journalartikel / Zeitschriftenartikel |
Abstract: | CTLs release cytotoxic proteins such as granzymes and perforin through fusion of cytotoxic granules (CG) at the target cell interface, the immune synapse, to kill virus-infected and tumorigenic target cells. A characteristic feature of these granules is their acidic pH inside the granule lumen, which is required to process precursors of granzymes and perforin to their mature form. However, the role of acidic pH in CG maturation, transport, and fusion is not understood. We demonstrate in primary murine CTLs that the a3-subunit of the vacuolar-type (H+)–adenosine triphosphatase is required for establishing a luminal pH of 6.1 inside CG using ClopHensorN(Q69M), a newly generated CG-specific pH indicator. Knockdown of the a3-subunit resulted in a significantly reduced killing of target cells and a >50% reduction in CG fusion in total internal reflection fluorescence microscopy, which was caused by a reduced number of CG at the immune synapse. Superresolution microscopy revealed a reduced interaction of CG with the microtubule network upon a3-subunit knockdown. Finally, we find by electron and structured illumination microscopy that knockdown of the a3-subunit altered the diameter and density of individual CG, whereas the number of CG per CTL was unaffected. We conclude that the a3-subunit of the vacuolar adenosine triphosphatase is not only responsible for the acidification of CG, but also contributes to the maturation and efficient transport of the CG to the immune synapse. |
DOI der Erstveröffentlichung: | 10.4049/jimmunol.1901536 |
URL der Erstveröffentlichung: | http://dx.doi.org/10.4049/jimmunol.1901536 |
Link zu diesem Datensatz: | urn:nbn:de:bsz:291--ds-383947 hdl:20.500.11880/34653 http://dx.doi.org/10.22028/D291-38394 |
ISSN: | 1550-6606 0022-1767 |
Datum des Eintrags: | 6-Dez-2022 |
Bezeichnung des in Beziehung stehenden Objekts: | Supplementary data |
In Beziehung stehendes Objekt: | https://journals.aai.org/jimmunol/article-supplement/110088/pdf/ji_1901536_supplemental_figures_1/ |
Fakultät: | M - Medizinische Fakultät NT - Naturwissenschaftlich- Technische Fakultät |
Fachrichtung: | M - Physiologie NT - Chemie |
Professur: | M - Prof. Dr. Jens Rettig NT - Prof. Dr. Uli Kazmaier |
Sammlung: | SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
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