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Das Masernvirus (MV) kann in Erkrankten eine schwere, langanhaltende Immunsuppression verursachen, wodurch Infektionen mit opportunistischen Pathogenen begünstigt werden. Diese basiert auf einer Paralyse der hämatopoetischen Zellen, welche das Virus durch Kontakt eines viralen Glykoproteinkomplexes zu einem unbekannten RezeptorX auf der Zell- Oberfläche induzieren kann. Kerncharakterisitika hiervon sind unter anderem die Herabregulation der Akt-Kinase-Phosphorylierung, die Inhibition der zellulären Proliferation und die Aktivierung der neutralen Sphingomyelinase 2 (NSM2).
In einem kinetischen Phosphoproteom konnten zwei potentielle Interaktionsrezeptoren des MV identifiziert werden: CD43 und P2X3. Das hochglykosylierte Oberflächenmolekül CD43 ist auf hämatopoetischen Zellen ubiquitär exprimiert und reguliert in T-Zellen deren Überleben, Proliferation, Aktivierung, Migration und Adhäsion. P2X3 wird in hämatopoetischen Zellen nur in geringem Maße exprimiert. Seine funktionelle Bedeutung ist in diesem Kompartiment nicht bekannt. Beide Kandidaten wurden mittels CRISPR/Cas9 Verfahren einzeln oder kombiniert aus Jurkat-T-Zellen ablatiert, welche nachfolgend nach MV-Kontakt hinsichtlich der oben erwähnten MV-modulierten Parameter getestet wurden. Zusätzlich wurden iso- und allosterische P2X3-Inhibitoren an primären und Jurkat-T-Zellen verwendet, um dessen Rolle in Ca2+-Mobilisierung und Proliferation nach T-Zell-Rezeptor Co-Stimulation zu analysieren.
Die genetische Depletion beider Rezeptor-Kandidaten verringerte die Effekte des MV auf alle getesteten Parameter signifikant, was darauf hindeutet, dass beide Proteine entscheidend an der T-Zell-Suppression beteiligt sind. Während die isosterische Inhibition von P2X3 keinen Effekt hatte, wurde die Proliferation primärer T-Zellen durch dessen allosterische Inhibition vor Co-Stimulation fast verdoppelt und die Effizienz der Ca2+-Mobilisierung in Jurkat- und primären T-Zellen signifikant erhöht. In P2X3-depletierten Jurkat-Zellen hingegen war die Ca2+-Mobilisierung nach Stimulation signifikant geringer als in WT-Zellen.
In dieser Arbeit konnten zwei wichtige Mediatoren der MV induzierten T-Zell-Suppression identifiziert werden. Vor allem P2X3, dessen Expression, Regulation und funktionelle Bedeutung im hämatopoetischen Kompartiment noch nicht erforscht wurde, könnte ein vielversprechender Kandidat für eine antivirale Therapie darstellen, da ein klinisch getesteter P2X3-Inhibitor bereits verfügbar ist.
N-Glykosylierungen spielen beim Env-Gen eine wichtige Rolle. Sie dienen nicht nur als „Escape-Phänomen“ zur Verhinderung einer Elimination des Virus durch neutralisierende Antikörper. Es hat sich gezeigt, dass bestimmte Menschen sich mit HIV infizieren können, aber es zu keinem Zeitpunkt zu AIDS-typischen Symptomen kommt, ohne die Einnahme antiretroviraler Therapie (ART). Solche Menschen werden als Elite Controller bezeichnet. Ihr Organismus kann selbst die Viruslast in sehr geringen Grenzen halten (< 50 Kopien/ml). Ziel dieser Arbeit ist es, den Einfluss von N-Glykosylierungen in der Entstehung von Elite Controller zu untersuchen und prozentuell eine Tendenz zu schaffen, inwieweit die Glykosylierungsdichte des Env-Proteins entscheidend ist. Es konnte gezeigt werden, dass eine immunologische Kontrolle auch auf der B-Zellebene stattfinden kann. Als Hinweis dient die geringe Glykosylierungsdichte im Bereich CD4bs und MPER, die indirekt über MHC Klasse II zu einer erhöhten Produktion von Antikörpern führen kann. Bisher wurde bei Elite Controller die T-Zellebene als mögliche immunologische Kontrolle beschrieben, jedoch gibt diese Arbeit hinweise, dass auch eine immunologische Kontrolle mittels Antikörper möglich ist. Die glykosylierten Zielepitope können eine große Hilfe sein für das Aussehen eines späteren Impfstoffs.
Gene expression in eukaryotic cells is regulated by the combinatorial action of numerous gene-regulatory factors, among which microRNAs (miRNAs) play a fundamental role at the post-transcriptional level. miRNAs are single-stranded, small non-coding RNA molecules that emerge in a cascade-like fashion via the generation of primary and precursor miRNAs. Mature miRNAs become functional when incorporated into the RNA induced silencing complex (RISC). miRNAs guide RISCs to target mRNAs in a sequence-specific fashion. To this end, base-pairs are usually formed between the miRNA seed region, spanning nucleotide positions 2 to 8 (from the 5' end) and the 3'UTR of the target mRNA. Once miRNA-mRNA interaction is established, RISC represses translation and occasionally induces direct or indirect target mRNA degradation. Interestingly, miRNAs are expressed not only in every multicellular organism but are also encoded by several viruses, predominately by herpesviruses. By controlling both, cellular as well as viral mRNA transcripts, virus-encoded miRNAs confer many beneficial effects on viral growth and persistence. Murine cytomegalovirus (MCMV) is a ß-herpesvirus and so far, 29 mature MCMV-encoded miRNAs have been identified during lytic infection. Computational analysis of previously conducted photoactivated ribonucleotide-enhanced individual nucleotide resolution crosslinking immunoprecipitation (PAR-iCLIP) experiments identified a read cluster within the 3' untranslated region (3'UTR) of the immediate early 3 (IE3) transcript in MCMV. Based on miRNA target predictions, two highly abundant MCMV miRNAs, namely miR-m01-2-3p and miR-M23-2-3p were found to potentially bind to two closely positioned target sites within the IE3 PAR-iCLIP peak. To confirm this hypothesis, we performed luciferase assays and showed that activity values of a luciferase fused with the 3'UTR of IE3 were downregulated in the presence of miR-m01- 2 and miR-M23-2. In a second step, we investigated the effect of pre-expression of miR-m01-2 and miR-M23-2 on the induction of virus replication. After optimizing the transfection procedure by comparing different reagents and conditions, plaque formation was monitored. We could demonstrate that the replication cycle of the wild-type but not of our MCMV mutant that harbored point mutations in both miRNA binding sites within the IE3-3'UTR, was significantly delayed in the presence of miR-m01-2 and miR-M23-2. This confirmed that miR-m01-2 and miR-M23-2 functionally target the major transcription factor IE3 which acts as an indispensable regulator of viral gene expression during MCMV lytic infection. Repression of the major immediate early genes by viral miRNAs is a conserved feature of cytomegaloviruses. The functional role of this type of regulation can now be studied in the MCMV mouse model.
Der Weg von der Entwicklung bis zur Zulassung neuer Virostatika ist bis heute mit hohen Kosten und einem großen Zeitaufwand verbunden. Sollten jedoch bereits zugelassene antivirale Medikamente eine Wirkung auf andere virale Infektionen zeigen, könnte dieser Prozess stark verkürzt werden. Daher war es Ziel dieser Arbeit, den Effekt von zugelassenen Medikamenten, gegen HSV-1, mCMV, hCMV, RSV, Parainfluenzavirus-3, DENV-2, CHIKV, Poliovirus, Masernvirus und HIV-1 zu evaluieren. Getestet wurden die Polymeraseinhibitoren ACV, GCV, CDV, sowie das neuere Medikament T-705 und die reversen Transkriptase-Inhibitoren TDF, 3TC, AZT und ABC. Außerdem die Proteaseinhibitoren SMV, GRV, DCV, LDV, ELB, VEL, SOF und DSV.
TDF senkte in einer Konzentration von 10 µM die Infektiosität von HSV-1 und mCMV bis zu 1 Größenordnung. Auch ABC senkte die Infektiosität von HSV-1 und mCMV in einer Konzentration von 30 µM um 0,4 bzw. 0,6 Größenordnungen. AZT und ELB senkten die Infektiosität bei Infektionen mit HSV-1 in einer Konzentration von 30 µM um 0,4 Größenordnungen. VEL senkte die Infektiosität von mCMV bis zu einer Konzentration von 2 µM um 0,7 Größenordnungen. Durch die Substanzen ELB und LDV konnte die Replikation von DENV-2 bei einer Konzentration von 10 µM um 0,6 bzw. 0,8 Größenordnungen gesenkt werden. Die Substanzen zeigten jedoch keinen Effekt auf Infektionen mit CHIKV und Poliovirus, sodass für beide Substanzen ein virusspezifischer Effekt anzunehmen ist. Es wurde keine Wirkung der Substanzen gegen Infektionen mit Masernvirus, RSV oder Parainfluenzavirus-3 in den Versuchen beobachtet. Es wurde gezeigt, dass die verwendeten Methoden eine schnelle und effektive Möglichkeit darstellen, neue direkt-antivirale Medikamente zu etablieren. Zudem stellen die gefundenen Wirkstoffe eine gute Grundlage als Leitsubstanzen zur Entwicklung neuer Wirkstoffe dar. Weitere Versuche mit Kombinationen der wirksamen Substanzen sollten zur weiteren Therapiefindung durchgeführt werden. Damit hat die vorgelegte Arbeit eine hohe Relevanz für die weitere Forschung.
Im Jahr 2015 wurde Plasmaproben von 161 HIV-positive Menschen auf HIV-Drug-Resistance untersucht. Die Patienten waren therapienaiv und wurde am Lighthouse-Hospital in Lilongwe, die Hauptstadt Malawis behandelt. Es zeigte sich eine HIVDR von insgesamt 17% welche aus mehreren Gesichtspunkte dargestellt worden sind, um zu zeigen ob 20105 in Malawi eingesetzte first-line Therapieregime eine gute Wirksamkeit zeigte.
The genomes of both human cytomegalovirus (HCMV) and murine cytomegalovirus (MCMV) were first sequenced over 20 years ago. Similar to HCMV, the MCMV genome had initially been proposed to harbor ≈170 open reading frames (ORFs). More recently, omics approaches revealed HCMV gene expression to be substantially more complex comprising several hundred viral ORFs. Here, we provide a state-of-the art reannotation of lytic MCMV gene expression based on integrative analysis of a large set of omics data. Our data reveal 365 viral transcription start sites (TiSS) that give rise to 380 and 454 viral transcripts and ORFs, respectively. The latter include 200 small ORFs, some of which represented the most highly expressed viral gene products. By combining TiSS profiling with metabolic RNA labelling and chemical nucleotide conversion sequencing (dSLAM-seq), we provide a detailed picture of the expression kinetics of viral transcription. This not only resulted in the identification of a novel MCMV immediate early transcript encoding the m166.5 ORF, which we termed ie4, but also revealed a group of well-expressed viral transcripts that are induced later than canonical true late genes and contain an initiator element (Inr) but no TATA- or TATT-box in their core promoters. We show that viral upstream ORFs (uORFs) tune gene expression of longer viral ORFs expressed in cis at translational level. Finally, we identify a truncated isoform of the viral NK-cell immune evasin m145 arising from a viral TiSS downstream of the canonical m145 mRNA. Despite being ≈5-fold more abundantly expressed than the canonical m145 protein it was not required for downregulating the NK cell ligand, MULT-I. In summary, our work will pave the way for future mechanistic studies on previously unknown cytomegalovirus gene products in an important virus animal model.
Introduction
Human cytomegalovirus (HCMV) causes significant morbidity and mortality in allogeneic stem cell transplant (alloSCT) recipients. Recently, antiviral letermovir prophylaxis during the first 100 days after alloSCT replaced PCR-guided preemptive therapy as the primary standard of care for HCMV reactivations. Here, we compared NK-cell and T-cell reconstitution in alloSCT recipients receiving preemptive therapy or letermovir prophylaxis in order to identify potential biomarkers predicting prolonged and symptomatic HCMV reactivation.
Methods
To that end, the NK-cell and T-cell repertoire of alloSCT recipients managed with preemptive therapy (n=32) or letermovir prophylaxis (n=24) was characterized by flow cytometry on days +30, +60, +90 and +120 after alloSCT. Additionally, background-corrected HCMV-specific T-helper (CD4+IFNγ+) and cytotoxic (CD8+IFNγ+CD107a+) T cells were quantified after pp65 stimulation.
Results
Compared to preemptive therapy, letermovir prophylaxis prevented HCMV reactivation and decreased HCMV peak viral loads until days +120 and +365. Letermovir prophylaxis resulted in decreased T-cell numbers but increased NK-cell numbers. Interestingly, despite the inhibition of HCMV, we found high numbers of “memory-like” (CD56dimFcεRIγ- and/or CD159c+) NK cells and an expansion of HCMV-specific CD4+ and CD8+ T cells in letermovir recipients. We further compared immunological readouts in patients on letermovir prophylaxis with non/short-term HCMV reactivation (NSTR) and prolonged/symptomatic HCMV reactivation (long-term HCMV reactivation, LTR). Median HCMV-specific CD4+ T-cell frequencies were significantly higher in NSTR patients (day +60, 0.35 % vs. 0.00 % CD4+IFNγ+/CD4+ cells, p=0.018) than in patients with LTR, whereas patients with LTR had significantly higher median regulatory T-cell (Treg) frequencies (day +90, 2.2 % vs. 6.2 % CD4+CD25+CD127dim/CD4+ cells, p=0.019). ROC analysis confirmed low HCMV specific CD4+ (AUC on day +60: 0.813, p=0.019) and high Treg frequencies (AUC on day +90: 0.847, p=0.021) as significant predictors of prolonged and symptomatic HCMV reactivation.
Discussion
Taken together, letermovir prophylaxis delays HCMV reactivation and alters NK- and T-cell reconstitution. High numbers of HCMV-specific CD4+ T cells and low numbers of Tregs seem to be pivotal to suppress post-alloSCT HCMV reactivation during letermovir prophylaxis. Administration of more advanced immunoassays that include Treg signature cytokines might contribute to the identification of patients at high-risk for long-term and symptomatic HCMV reactivation who might benefit from prolonged administration of letermovir.
Myeloid-derived suppressor cells (MDSC) represent major regulators of immune responses, which can control T cells via their inducible nitric oxide synthase (iNOS)- and arginase 1 (Arg1)-mediated effector functions. While GM-CSF is well documented to promote MDSC development, little is known about this potential of IL-3, an established growth factor for mast cells. Here, we show that IL-3, similar to GM-CSF, generates monocytic MDSC (M-MDSC) from murine bone marrow (BM) cells after 3 days of in vitro culture. At this time point, predominantly CD11b+ CD49a+ monocytic and CD11b+ CD49a- FcεR I- neutrophilic cells were detectable, while CD11blow/neg FcεR I+ mast cells accumulated only after extended culture periods. Both growth factors were equivalent in generating M-MDSC with respect to phenotype, cell yield and typical surface markers. However, IL-3 generated M-MDSC produced less TNF, IL-1β and IL-10 after activation with LPS + IFN-γ but showed higher Arg1 expression compared to GM-CSF generated M-MDSC. Arg1 was further induced together with iNOS after MDSC activation. Accordingly, an increased Arg1-dependent suppressor activity by the IL-3 generated M-MDSC was observed using respective iNOS and Arg1 inhibitors. Together, these data indicate that M-MDSC can be generated in vitro by IL-3, similar to GM-CSF, but with increased Arg1 expression and Arg1-mediated suppression capacity. This protocol now allows further in vitro studies on the role of IL-3 for MDSC biology.
MDSCs are suppressive immune cells with a high relevance in various pathologies including cancer, autoimmunity, and chronic infections. Surface marker expression of MDSCs resembles monocytes and neutrophils which have immunostimulatory functions instead of suppressing T cells. Therefore, finding specific surface markers for MDSCs is important for MDSC research and therapeutic MDSC manipulation. In this study, we analyzed if the integrin VLA-1 has the potential as a novel MDSC marker. VLA-1 was expressed by M-MDSCs but not by G-MDSCs as well as by Teff cells. VLA-1 deficiency did not impact iNOS expression, the distribution of M-MDSC and G-MDSC subsets, and the suppressive capacity of MDSCs towards naïve and Teff cells in vitro. In mice, VLA-1 had no effect on the homing capability of MDSCs to the spleen, which is a major reservoir for MDSCs. Since the splenic red pulp contains collagen IV and VLA-1 binds collagen IV with a high affinity, we found MDSCs and Teff cells in this area as expected. We showed that T cell suppression in the spleen, indicated by reduced T cell recovery and proliferation as well as increased apoptosis and cell death, partially depended on VLA-1 expression by the MDSCs. In a mouse model of multiple sclerosis, MDSC injection prior to disease onset led to a decrease of the disease score, and this effect was significantly reduced when MDSCs were VLA-1 deficient. The expression of Sema7A by Teff cells, a ligand for VLA-1 which is implicated in negative T cell regulation, resulted in a slightly stronger Teff cell suppression by MDSCs compared to Sema7A deficient T cells. Live cell imaging and intravital 2-photon microscopy showed that the interaction time of MDSCs and Teff cells was shorter when MDSCs lacked VLA 1 expression, however VLA-1 expression had no impact on MDSC mobility. Therefore, the VLA-1-dependent interaction of MDSC and Teff cells on collagen IV in the splenic red pulp is implicated MDSC-mediated Teff cell suppression.