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Genetic deficiency for acid sphingomyelinase or its pharmacological inhibition has been shown to increase Foxp3\(^+\) regulatory T-cell frequencies among CD4\(^+\) T cells in mice. We now investigated whether pharmacological targeting of the acid sphingomyelinase, which catalyzes the cleavage of sphingomyelin to ceramide and phosphorylcholine, also allows to manipulate relative CD4\(^+\) Foxp3\(^+\) regulatory T-cell frequencies in humans. Pharmacological acid sphingomyelinase inhibition with antidepressants like sertraline, but not those without an inhibitory effect on acid sphingomyelinase activity like citalopram, increased the frequency of Foxp3\(^+\) regulatory T cell among human CD4\(^+\) T cells in vitro. In an observational prospective clinical study with patients suffering from major depression, we observed that acid sphingomyelinase-inhibiting antidepressants induced a stronger relative increase in the frequency of CD4\(^+\) Foxp3\(^+\) regulatory T cells in peripheral blood than acid sphingomyelinase-non- or weakly inhibiting antidepressants. This was particularly true for CD45RA\(^-\) CD25\(^{high}\) effector CD4\(^+\) Foxp3\(^+\) regulatory T cells. Mechanistically, our data indicate that the positive effect of acid sphingomyelinase inhibition on CD4\(^+\) Foxp3\(^+\) regulatory T cells required CD28 co-stimulation, suggesting that enhanced CD28 co-stimulation was the driver of the observed increase in the frequency of Foxp3+ regulatory T cells among human CD4\(^+\) T cells. In summary, the widely induced pharmacological inhibition of acid sphingomyelinase activity in patients leads to an increase in Foxp3+ regulatory T-cell frequencies among CD4\(^+\) T cells in humans both in vivo and in vitro.
Lack of acid sphingomyelinase (ASM) activity, either through genetic deficiency or through pharmacological inhibition, is linked with increased activity and frequency of Foxp3+ regulatory T cells (Treg) among cluster of differentiation (CD) 4+ T cells in mice in vivo and in vitro1. Thus, pharmacological blockade of ASM activity, which catalyzes the cleavage of sphingomyelin to ceramide and phosphocholine, might be used as a new therapeutic mechanism to correct numeric and/ or functional Treg de-ficiencies in diseases like multiple sclerosis or major depression.
In the present study, the effect of pharmacological inhibition of ASM in humans, in vitro and in vivo, was analyzed. In the in vitro experiments, peripheral blood mono-nuclear cells (PBMC) of healthy human blood donors were treated with two widely prescribed antidepressants with high (sertraline, Ser) or low (citalopram, Cit) capaci-ty to inhibit ASM activity. Similar to the findings in mice an increase in the frequency of Treg among human CD4+ T cells upon inhibition of ASM activity was observed. For the analysis in vivo, a prospective study of the composition of the CD4+ T cell com-partment of patients treated for major depression was done. The data show that pharmacological inhibition of ASM activity was superior to antidepressants with little or no ASM-inhibitory activity in increasing CD45RA- CD25high effector Treg (efTreg) frequencies among CD4+ T cells to normal levels. Independently of ASM inhibition, correlating the data with the clinical response, i.e. improvement of the Hamilton rat-ing scale for depression (HAMD) by at least 50 per cent (%) after four weeks of treatment, it was found that an increase in efTreg frequencies among CD4+ cells dur-ing the first week of treatment identified patients with a clinical response.
Regarding the underlying mechanism, it could be found that the positive effect of ASM inhibition on Treg required CD28 co-stimulation suggesting that enhanced CD28 co-stimulation was the driver of the observed increase in the frequency of Treg among human CD4+ T cells. Inhibition of ASM activity was further associated with changes in the expression and shuttling of CTLA-4, a key inhibitory molecule ex-pressed by Treg, between cellular compartments but the suppressive activity of CTLA-4 through its transendocytosis activity was unaffected by the inhibition of ASM activity.
In summary, the frequency of (effector) Treg among CD4+ T cells in mice and in hu-mans is increased after inhibition of ASM activity suggesting that ASM blockade might beneficially modulate autoimmune diseases and depression-promoting in-flammation.
The predicted 80 open reading frames (ORFs) of herpes simplex virus 1 (HSV-1) have been intensively studied for decades. Here, we unravel the complete viral transcriptome and translatome during lytic infection with base-pair resolution by computational integration of multi-omics data. We identify a total of 201 transcripts and 284 ORFs including all known and 46 novel large ORFs. This includes a so far unknown ORF in the locus deleted in the FDA-approved oncolytic virus Imlygic. Multiple transcript isoforms expressed from individual gene loci explain translation of the vast majority of ORFs as well as N-terminal extensions (NTEs) and truncations. We show that NTEs with non-canonical start codons govern the subcellular protein localization and packaging of key viral regulators and structural proteins. We extend the current nomenclature to include all viral gene products and provide a genome browser that visualizes all the obtained data from whole genome to single-nucleotide resolution. Here, using computational integration of multi-omics data, the authors provide a detailed transcriptome and translatome of herpes simplex virus 1 (HSV-1), including previously unidentified ORFs and N-terminal extensions. The study also provides a HSV-1 genome browser and should be a valuable resource for further research.
Exon-4 Mutations in KRAS Affect MEK/ERK and PI3K/AKT Signaling in Human Multiple Myeloma Cell Lines
(2020)
Approximately 20% of multiple myeloma (MM) cases harbor a point mutation in KRAS. However, there is still no final consent on whether KRAS-mutations are associated with disease outcome. Specifically, no data exist on whether KRAS-mutations have an impact on survival of MM patients at diagnosis in the era of novel agents. Direct blockade of KRAS for therapeutic purposes is mostly impossible, but recently a mutation-specific covalent inhibitor targeting KRAS\(^{p.G12C}\) entered into clinical trials. However, other KRAS hotspot-mutations exist in MM patients, including the less common exon-4 mutations. For the current study, the coding regions of KRAS were deep-sequenced in 80 newly diagnosed MM patients, uniformely treated with three cycles of bortezomib plus dexamethasone and cyclophosphamide (VCD)-induction, followed by high-dose chemotherapy and autologous stem cell transplantation. Moreover, the functional impact of KRAS\(^{p.G12A}\) and the exon-4 mutations p.A146T and p.A146V on different survival pathways was investigated. Specifically, KRAS\(^{WT}\), KRAS\(^{p.G12A}\), KRAS\(^{p.A146T}\), and KRAS\(^{p.A146V}\) were overexpressed in HEK293 cells and the KRAS\(^{WT}\) MM cell lines JJN3 and OPM2 using lentiviral transduction and the Sleeping Beauty vector system. Even though KRAS-mutations were not correlated with survival, all KRAS-mutants were found capable of potentially activating MEK/ERK- and sustaining PI3K/AKT-signaling in MM cells.
Psychosocial factors affect mental health and health-related quality of life (HRQL) in a complex manner, yet gender differences in these interactions remain poorly understood. We investigated whether psychosocial factors such as social support and personal and work-related concerns impact mental health and HRQL differentially in women and men during the first year of the COVID-19 pandemic. Between June and October 2020, the first part of a COVID-19-specific program was conducted within the “Characteristics and Course of Heart Failure Stages A-B and Determinants of Progression (STAAB)” cohort study, a representative age- and gender-stratified sample of the general population of Würzburg, Germany. Using psychometric networks, we first established the complex relations between personal social support, personal and work-related concerns, and their interactions with anxiety, depression, and HRQL. Second, we tested for gender differences by comparing expected influence, edge weight differences, and stability of the networks. The network comparison revealed a significant difference in the overall network structure. The male (N = 1370) but not the female network (N = 1520) showed a positive link between work-related concern and anxiety. In both networks, anxiety was the most central variable. These findings provide further evidence that the complex interplay of psychosocial factors with mental health and HRQL decisively depends on gender. Our results are relevant for the development of gender-specific interventions to increase resilience in times of pandemic crisis.
Die rheumatoide Arthritis (RA) ist eine chronische, progressive und systemische Autoimmunerkrankung, in deren Zentrum das dauerhaft entzündete Synovialgewebe der Gelenke steht. Aufgrund vielfältiger Knochen- und Knorpel-destruierender Prozesse kommt es zu irreversiblen Funktionalitätsverlusten der betroffenen Gelenke. Eine tragende Rolle bei der Ausprägung der klinischen Manifestationen wird dabei der exzessiven Synthese des proinflammatorischen Cytokins IL-1 zugesprochen. Dessen Aktivität kann durch kompetitive Blockade des IL-1 Rezeptors Typ I mit dem natürlich vorkommenden, antiinflammatorischen IL-1 Rezeptorantagonisten (IL-1Ra) inhibiert werden. Der Cytokin-blockierende Therapieansatz mit Anakinra, einem rekombinant hergestellten IL-1Ra, konnte die pharmakologischen Behandlungsmöglichkeiten der RA seit 2001 wesentlich erweitern. Gleichwohl erfordern die geringen Halbwertszeiten von IL-1Ra regelmäßige subkutane Injektionen, um hinreichende therapeutische Wirkstoffspiegel im Patienten aufrecht zu erhalten. Vor diesem Hintergrund bieten somatische Gentherapiekonzepte eine vielversprechende Alternative zu den konventionellen Behandlungsstrategien bei der RA-Therapie. Ein IL-1Ra-Gentransfer ins Gelenk soll die persistierende, lokale, endogene Synthese des therapeutischen IL-1Ra-Proteins ermöglichen und lässt in dieser Hinsicht eine nachhaltige Verbesserung der klinischen Symptomatik erwarten. In dieser Arbeit wurden dafür gentherapeutische Foamyvirus-Adenovirus-Hybridvektoren (FAD) zur Expression des IL-1Ra entwickelt und die Funktionalität der Konstrukte evaluiert. Die Vektoren sollten die effizienten adenoviralen Transduktionsmechanismen mit dem Potential der foamyviralen somatischen Integration für einen direkten in vivo Gentransfer kombinieren. Das System besteht aus einem adenoviralen Hochkapazitätsvektor vom Serotyp 5, der eine selbstinaktivierende PFV-Vektorkassette unter Kontrolle des Reversen Tetracyclin Transaktivator Systems (Tet-On) enthält. In FAD-transduzierten Zellen wurde die funktionelle Induzierbarkeit der PFV-Vektorexpression nachgewiesen und die Kinetik der PFV-Partikelfreisetzung charakterisiert. Nach Induktion der PFV-Vektorkassette konnte in FAD-transduzierten Zellen ein langfristig-stabiler IL-1Ra-Gentransfer gezeigt werden. Ferner konnten protektive Effekte eines FAD-vermittelten IL-1Ra-Gentransfers im Zellkulturmodell nachgewiesen werden. Tierexperimentelle Untersuchungen zeigten eine erfolgreiche Transduktion von Synovialzellen nach intraartikulärer Applikation von FAD-Vektoren. Das Tetracyclin-regulierbare Hybridvektorsystem zur Expression des IL-1Ra, das in der vorliegenden Arbeit geschaffen wurde, könnte zukünftig die Basis für ein effektives Werkzeug zum intraartikulären Gentransfer in der klinischen Praxis bieten.
Glucocorticoids (GCs) are small lipophilic compounds that mediate a plethora of biological effects by binding to the intracellular glucocorticoid receptor (GR) which, in turn, translocates to the nucleus and directly or indirectly regulates gene transcription. GCs remain the cornerstone in the treatment for a number of hematological malignancies, including leukemia, lymphoma and myeloma. Extensive literature suggests that the efficacy of GCs stems from their ability to mediate apoptosis. Despite the enormous strides made in our understanding of regulated cell death, the exact mechanism by which GCs cause apoptosis is still unknown. The data obtained so far provide strong evidence that gene transactivation by the GR underlies the initiation phase of GC-induced thymocyte apoptosis. Furthermore, the multicatalytic proteasome, several members of the Bcl-2 family, changes in calcium flux as well as caspases have been identified as important players in the execution phase of GC-mediated cell death. However, the exact sequence of events in this process still remains elusive. A major problem of the current discussion arises from the fact that different cell types, such as thymocytes, peripheral T cells and lymphoma cells are compared without acknowledging their different characteristics and gene expression profiles. Although it is generally assumed that GCs induce apoptosis via a conserved mechanism, this is not supported by any data. In other words, it is possible that thymocytes, peripheral T cells and lymphoma cells may undergo cell death along different pathways. We therefore wondered whether a unique signal transduction pathway is engaged by GCs to initiate and execute cell death in all types of T lymphocytes or whether distinct pathways exist. Therefore, we compared the role of the proteasome, various caspases, the lysosomal compartment and other factors in GC-induced apoptosis of murine thymocytes and peripheral T cells as well as T-ALL lymphoma cells. Our findings show that the initiation phase of GC-induced apoptosis is similar irrespective of the differentiation state of the cell. Apoptosis in both thymocytes and peripheral T cells is mediated by the GR and depends on gene transcription. In contrast, the execution phase significantly differs between thymocyte and peripheral T cells in its requirement for a number of signal transduction components. Whilst in thymocytes, the proteasome, caspases 3, 8 and 9 as well as cathepsin B play an important role in GC-induced apoptosis, these factors are dispensable for the induction of cell death in peripheral T cells. In contrast, changes in the expression and intracellular location of Bcl-2 family members do not appear to contribute to GC-induced apoptosis in either cell type. Importantly, our observation that GC treatment of thymocytes leads to an activation of the lysosomal protease cathepsin B and that this is an essential step in the induction of cell death by GCs, is the first indication that a lysosomal amplification loop is involved in this process. Analysis of GC-induced apoptosis in several T-ALL cell lines further indicates that the signaling pathway induced by GCs in thymocytes but not in peripheral T cells is shared by all lymphoma cell-types analyzed. Given the therapeutic importance of high-dose GC-therapy for the treatment of hematological malignancies, this finding could potentially form a basis for new anti-cancer strategies in the future, which specifically target tumor cells whilst leaving peripheral T cells of patients untouched.
CHIKV is the prototype of Alphaviruses and it causes an acute febrile illness with rash, severely painful arthralgias, and sometimes arthritis. While CHIKV has first been identified in the 1950s in Africa, recent outbreaks of CHIKV in the islands of the Indian Ocean and particular in Italia have re-drawn attention to CHIKV. In the past CHIKV disease was considered self-limiting and non-fatal. However, a number of deaths on Reunion (Anonym, 2006) during the outbreak, which was affected directly or indirectly by CHIKV, have changed this view. To defeat CHIKV outbreaks diagnostic tools and anti CHIKV therapies are urgently needed. In this thesis, we generated tools to investigate CHIKV at the molecular level by serological tests. CHIKV was isolated from a German woman who was infected during her holidays on the Mauritius Island. To characterize this viral isolate the complete viral genome was amplified by PCR and molecular cloned. In order to analyse antibody responses of infected individuals some of the structural and non-structural genes were subcloned in bacterial expression vectors. The NSP2, proteinase, capsid, E1 and E2 were subsequently expressed in E.coli using purified successfully. In this thesis, the structural proteins were used to develop a screening test for anti-CHIKV antibodies in patient derived serum samples. These tests were evaluated with pre-characterized anti-CHIKV sera (30 samples) obtained from the BNI Hamburg and 100 serum samples from German blood donors used as negative controls. Immunoblotting analysis revealed that up to 77% of precharacterised positive sera could recognize the recombinant proteins and there were no detectable reactivity of CHIKV-negative German donor sera. The recombinant proteins were also recognized by 71.4% of positive sera in the newly established ELISA. In order to go further in analyses of the results, an in house IFA was performed. Positive sera (21 samples) were used. The results showed that all of them reacted positive, but this assay was less sensitive than the IFA from BNI. In comparison with the IFA result from BNI Hamburg, the results were not congruent in all test performed. This could be due to various drawbacks of the tests. A cross reaction in Alphaviruses and the different strains are mentioned as well as the denatured forms of the structural proteins. Besides the main structural proteins (E1, E2 and C), other proteins such as non-structural proteins, uncleaved precursor proteins could participate in the different outcomes of serological assays. In order to go further in the CHIKV diagnoses, the CHIKV recombinant proteins were applied to screen the anti-CHIKV antibodies in the Vietnamese population, who are considered to live in the high risk regions. In serological tests, 158 sera of Vietnamese donors were incubated with the recombinant proteins or the fixed CHIKV infected cells. The results showed that 24% of Vietnamese donor sera recognized the recombinant proteins in immunoblot assay, while 36% scored positive in the ELISA assay. In IFA, the sera considered positive were 11.4%. While some discrepancies in serological tests were found, these results showed that the ratio of CHIKV-positive sera seem to be equal to the other regions in the world, which are affected by CHIKV. It is suggested that CHIKV infection in Vietnam has been repeatedly misdiagnosed. This study cohort consisted only of samples originating from Hanoi area of Northern Vietnam, thus, future studies should expand to include samples from other Vietnam areas. To do this the various subtypes of the virus in the different regions should be isolated and the sequences of these viruses should be well characterized.
Magnetic nanoparticles (MNPs) have been adapted for many applications, e.g., bioassays for the detection of biomarkers such as antibodies, by controlled engineering of specific surface properties. Specific measurement of such binding states is of high interest but currently limited to highly sensitive techniques such as ELISA or flow cytometry, which are relatively inflexible, difficult to handle, expensive and time-consuming. Here we report a method named COMPASS (Critical-Offset-Magnetic-Particle-SpectroScopy), which is based on a critical offset magnetic field, enabling sensitive detection to minimal changes in mobility of MNP ensembles, e.g., resulting from SARS-CoV-2 antibodies binding to the S antigen on the surface of functionalized MNPs. With a sensitivity of 0.33 fmole/50 µl (≙7 pM) for SARS-CoV-2-S1 antibodies, measured with a low-cost portable COMPASS device, the proposed technique is competitive with respect to sensitivity while providing flexibility, robustness, and a measurement time of seconds per sample. In addition, initial results with blood serum demonstrate high specificity.