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  • 1
    In: Blood, American Society of Hematology, Vol. 114, No. 22 ( 2009-11-20), p. 3682-3682
    Abstract: Abstract 3682 Poster Board III-618 Innate immunity including granulocytes, monocytes, and NK cells is reported to recover rapidly after allogeneic stem cell transplantation within weeks. In contrast, adaptive immunity, including T- and B-cells, has delayed recovery over months. In murine models innate type marginal zone and B1 B cells, established at fetal age and providing natural antibodies, are distinguished from adaptive B2 or follicular B cells. A crucial maturation and survival factor for adaptive murine B cells was shown to be TNF-family member BAFF (B cell-activating factor), while development of innate B1 B cells is BAFF independent. Kinetics in reconstitution of innate and adaptive immunity after ablation in adults may give insight into hierarchy and attribution to innate and adaptive immunity of defined lymphocyte populations. Reconstitution of lymphopoiesis after CD3 and CD19 depleted haploidentical stem cell transplantation was analyzed in 10 patients, which received monoclonal anti-CD3 antibody OKT3 as immunosuppressant only. This model may enable detailed in vivo evaluation of de novo B cell formation. Weekly samples before and after reduced-intensity conditioning were analyzed by flow cytometry for absolute numbers of T-cell, NK-, and B-cell subsets. Their origin of host or donor hematopoiesis was differentiated by HLA-FACS. Antibody secreting cells (ASC) were enumerated by ELISPOT. Plasma cytokine concentrations were determined by bead based arrays and ELISA. Complete reconstitution of allogeneic NK cells was found at day +21 after transplantation. CD4+ and CD8+ T-cells and their subsets had delayed reconstitution with less then 100 cells/μl at 3 months after transplantation. CD19+ B-lymphocytes of naïve and memory phenotype ( 〉 0,5% of all lymphocytes) were detected not before day +60. In contrast, complete reconstitution of antibody-secreting cells after a nadir ( 〈 0,05/μl) was observed at day +14. Absolute numbers of ASC were comparable to those of healthy controls (d+14: 72 ASC/μl vs. control: 12 ASC/μl). ASC secreting the isotypes IgM and IgA were more prevalent than IgG compared to controls (time increase: IgM 20; IgA 10; IgG 2,9). These ASC appear CD19low/neg, CD38+, and intracellular Ig+ in flow cytometry and carried donor HLA-haplotype. Reconstitution of ASC occurred without detectable circulating T-cells and before increase of BAFF concentrations were observed. In summary, the rapid and complete reconstitution of peripheral blood ASC after allogeneic transplantation, far proceeding detection of naïve and memory type B-cells, is a novel observation. Incidence before T-cell reconstitution and increase in BAFF concentrations indicates a T-cell and BAFF independent mechanism allocating these early ASC to innate immunity, potentially maintaining natural antibody levels. Disclosures: No relevant conflicts of interest to declare.
    Type of Medium: Online Resource
    ISSN: 0006-4971 , 1528-0020
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    Language: English
    Publisher: American Society of Hematology
    Publication Date: 2009
    detail.hit.zdb_id: 1468538-3
    detail.hit.zdb_id: 80069-7
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  • 2
    In: Cell Death & Disease, Springer Science and Business Media LLC, Vol. 11, No. 8 ( 2020-08-24)
    Abstract: Soft tissue sarcomas (STS) are a heterogeneous group of malignancies predominantly affecting children and young adults. Despite improvements in multimodal therapies, 5-year survival rates are only 50% and new treatment options in STS are urgently needed. To develop a rational combination therapy for the treatment of STS we focused on ABT-199 (Venetoclax), a BCL-2 specific BH3-mimetic, in combination with the proteasome inhibitor bortezomib (BZB). Simultaneous inhibition of BCL-2 and the proteasome resulted in strongly synergistic apoptosis induction. Mechanistically, ABT-199 mainly affected the multidomain effector BAX by liberating it from BCL-2 inhibition. The combination with BZB additionally resulted in the accumulation of BOK, a BAX/BAK homologue, and of the BH3-only protein NOXA, which inhibits the anti-apoptotic protein MCL-1. Thus, the combination of ABT-199 and BZB sensitizes STS cells to apoptosis by simultaneously releasing several defined apoptotic restraints. This synergistic mechanism of action was verified by CRISPR/Cas9 knock-out, showing that both BAX and NOXA are crucial for ABT-199/BZB-induced apoptosis. Noteworthy, efficient induction of apoptosis by ABT-199/BZB was not affected by the p53 status and invariably detected in cell lines and patient-derived tumor cells of several sarcoma types, including rhabdomyo-, leiomyo-, lipo-, chondro-, osteo-, or synovial sarcomas. Hence, we propose the combination of ABT-199 and BZB as a promising strategy for the treatment of STS, which should warrant further clinical investigation.
    Type of Medium: Online Resource
    ISSN: 2041-4889
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 2541626-1
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  • 3
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2005
    In:  Investigational New Drugs Vol. 23, No. 3 ( 2005-06), p. 205-211
    In: Investigational New Drugs, Springer Science and Business Media LLC, Vol. 23, No. 3 ( 2005-06), p. 205-211
    Type of Medium: Online Resource
    ISSN: 0167-6997 , 1573-0646
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2005
    detail.hit.zdb_id: 2009846-7
    SSG: 15,3
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  • 4
    Online Resource
    Online Resource
    American Society of Clinical Oncology (ASCO) ; 2013
    In:  Journal of Clinical Oncology Vol. 31, No. 15_suppl ( 2013-05-20), p. 10562-10562
    In: Journal of Clinical Oncology, American Society of Clinical Oncology (ASCO), Vol. 31, No. 15_suppl ( 2013-05-20), p. 10562-10562
    Abstract: 10562 Background: Neurotrophins (NT) influence proliferation, survival, death, and differentiation by binding Tropomyosin-related kinase (Trk) receptors and p75 NTR (CD271). While the three Trk-receptors TrkA, TrkB, and TrkC display specific binding to their ligands, i.e. TrkA to NGF (nerve growth factor), TrkB to BDNF (brain-derived neurotrophic factor), NT4/5 (neurotrophin 4/5) and TrkC to NT3 (neurotrophin 3), CD271 shows low affinity to all neurotrophins. Notably, CD271 has been suggested as marker for the prospective isolation of bone marrow mesenchymal stromal cells (MSC), and rhabdomyosarcomas have previously been found to express neurotrophins and NT receptors. Methods: RNA was isolated from sarcoma cell lines and freshly obtained sarcoma (src) cells from patients after surgical resection. RNA was reverse transcribed and cDNA products underwent PCR analysis with specific primers. Furthermore, cell lines from the same primary tissues were established and treated with doxorubicin. Effects of K252a (Trk receptor inhibitor), Pep5 (CD271-Inhibitor), and neurotrophins on sarcoma cell proliferation and survival were analyzed. Results: An array of freshly obtained clinical src samples (n=10 each subtype) was screened for expression of NT3, NT4/5, BDNF, NGF as well as TrkA, TrkB, TrkC, and CD271. Interestingly, src subtype-specific expression patterns were observed. In the established cell lines, K252a increased doxorubicin-induced tumor cell death, while CD271-Inhibitor Pep5 enhanced proliferation in doxorubicin treated cells, especially under serum free conditions and when combined with BDNF and NGF. Conclusions: NT and NT receptors are expressed on all adult src samples screened in this study. Chemotherapy resistant liposrc as well as myxofibrosrc samples displayed the strongest expression of NT3 as well as TrkB, TrkC, and CD271. The concomitant expression of NT and their receptors suggests autocrine self-stimulation, which may propagate survival, proliferation, and treatment resistance. NT receptor tyrosine kinases may represent an interesting therapeutic target in adult src.
    Type of Medium: Online Resource
    ISSN: 0732-183X , 1527-7755
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    Language: English
    Publisher: American Society of Clinical Oncology (ASCO)
    Publication Date: 2013
    detail.hit.zdb_id: 2005181-5
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  • 5
    In: Stem Cells Translational Medicine, Oxford University Press (OUP), Vol. 2, No. 1 ( 2013-01-01), p. 53-60
    Abstract: Advanced adult soft-tissue sarcomas (STSs) are rare tumors with a dismal prognosis and limited systemic treatment options. STSs may originate from mesenchymal stem cells (MSCs); the latter have mainly been isolated from adult bone marrow as plastic-adherent cells with differentiation capacity into mesenchymal tissues. Recently, a panel of antibodies has been established that allows for the prospective isolation of primary MSCs with high selectivity. Similar to cancer stem cells in other malignancies, sarcoma stem cells may bear immunophenotypic similarity with the corresponding precursor, that is, MSCs. We therefore set out to establish the expression pattern of MSC markers in sarcoma cell lines and primary tumor samples by flow cytometry. In addition, fibroblasts from different sources were examined. The results document a significant amount of MSC markers shared by sarcoma cells. The expression pattern includes uniformly expressed markers, as well as MSC markers that only stained subpopulations of sarcoma cells. Expression of W5C5, W8B2 (tissue nonspecific alkaline phosphatase [TNAP]), CD344 (frizzled-4), and CD271 marked subpopulations displaying increased proliferation potential. Moreover, CD271+ cells displayed in vitro doxorubicin resistance and an increased capacity to form spheres under serum-free conditions. Interestingly, another set of antigens, including the bona fide progenitor cell markers CD117 and CD133, were not expressed. Comparative expression patterns of novel MSC markers in sarcoma cells, as well as fibroblasts and MSCs, are presented. Our data suggest a hierarchical cytoarchitecture of the most common adult type sarcomas and introduce W5C5, TNAP, CD344, and CD271 as potential sarcoma progenitor cell markers.
    Type of Medium: Online Resource
    ISSN: 2157-6564 , 2157-6580
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2013
    detail.hit.zdb_id: 2642270-0
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  • 6
    In: Blood, American Society of Hematology, Vol. 118, No. 21 ( 2011-11-18), p. 4830-4830
    Abstract: Abstract 4830 Introduction: G-CSF is generally accepted to be the major cytokine regulating neutrophil production, but neutrophil steady-state homeostasis has still not been fully elucidated. We have previously shown in NODSCIDcγ−/− mice that feedback G-CSF expression upon antibody-based neutrophil depletion occurs independent from lymphocytes (Bugl et al., ASH 2010) and hypothesized that there may be a sensing mechanism of neutropenia relying on the presence of microbial components, similar to emergency granulopoiesis. Therefore, germ-free wildtype mice received anti-neutrophil antibodies and underwent further analysis. Moreover, passive regulation of circulating G-CSF levels by neutrophil cell mass was examined. Methods: Anti-Ly6-G antibody (clone 1A8) was used to induce neutropenia in germ-free C57BL/6 mice. After one week of neutrophil depletion hematopoietic tissues and peripheral blood were harvested and analyzed on cellular, protein and RNA level. Moreover, neutrophil granulocytes (granulocyte-differentiation antigen-1+ Mac-1+) purified from peripheral blood of C57BL/6 mice were transfused into neutropenic wild type mice and plasma G-CSF was monitored. Results: Peripheral blood neutropenia could be effectively induced in all experimental mice by anti-1A8 antibody. Transfusion of 3.5 × 106 neutrophils into neutropenic wild type mice did not significantly change plasma G-CSF levels. Filgrastim (rhG-CSF), however, caused significant downregulation of bone marrow G-CSF at the mRNA level. Germ-free C57BL/6 mice were analyzed after 1 week of antibody-induced neutropenia and showed a shift of myeloid progenitors towards granulocyte macrophage precursors (GMP) at the expense of megakaryocyte erythrocyte progenitors (MEP) as well as significantly increased numbers of hematopoietic stem cells. In addition, G-CSF, M-CSF, and CXCL12 behaved identically in both germ-free control and wild type mice under specific-pathogen free conditions. Conclusions: Transfusion of G-CSF-receptor (CSF3R) positive neutrophils did not significantly influence G-CSF. Moreover, exogenous G-CSF downregulated marrow G-CSF on the transcriptional level. Germ-free mice are able to mount a feedback loop including G-CSF upregulation and marrow changes in progenitor cell distribution analogous to mice carrying physiological commensal bacteria. Our data are therefore consistent with G-CSF feedback regulation occurring independent from commensal germs. Moreover, our data indicate transcriptional rather than CSF3R+ cell mass-associated passive regulation of G-CSF levels. Taken together, we propose a model of myeloid bone marrow homeostasis, where feedback loops of neutrophil production upon antibody-dependent neutropenia occur through transcriptional upregulation of G-CSF. The underlying mechanisms occur independent of lymphocytes and presence of germs. Disclosures: No relevant conflicts of interest to declare.
    Type of Medium: Online Resource
    ISSN: 0006-4971 , 1528-0020
    RVK:
    RVK:
    Language: English
    Publisher: American Society of Hematology
    Publication Date: 2011
    detail.hit.zdb_id: 1468538-3
    detail.hit.zdb_id: 80069-7
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  • 7
    In: Blood, American Society of Hematology, Vol. 121, No. 5 ( 2013-01-31), p. 723-733
    Abstract: Steady-state and emergency granulopoiesis are both dependent on TLR signaling.
    Type of Medium: Online Resource
    ISSN: 0006-4971 , 1528-0020
    RVK:
    RVK:
    Language: English
    Publisher: American Society of Hematology
    Publication Date: 2013
    detail.hit.zdb_id: 1468538-3
    detail.hit.zdb_id: 80069-7
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  • 8
    In: Molecular Cancer Therapeutics, American Association for Cancer Research (AACR), Vol. 7, No. 7 ( 2008-07-01), p. 1940-1948
    Abstract: The biosynthesis of immunoglobulin leads to constitutive endoplasmic reticulum (ER) stress in myeloma cells, which activates the unfolded protein response (UPR). The UPR promotes protein folding by chaperones and increases proteasomal degradation of misfolded protein. Excessive ER stress induces apoptosis and represents a molecular basis for the bortezomib sensitivity of myeloma. Most solid malignancies such as sarcoma, by contrast, are poorly bortezomib sensitive and display low levels of ER stress. We hypothesized that pharmacologic induction of ER stress might sensitize malignancies to bortezomib treatment. We show that the HIV protease inhibitor ritonavir induces ER stress in bortezomib-resistant sarcoma cells. Ritonavir triggered the UPR, decreased the degradation of newly synthesized protein, but did not directly inhibit proteasomal active sites in the therapeutic dose range in contrast to bortezomib. Whereas neither bortezomib nor ritonavir monotherapy translated into significant apoptosis at therapeutic drug levels, the combination strongly increased the level of ER stress and activated PERK, IRE1, and ATF6, synergistically induced CHOP, JNK, caspase-4, and caspase-9, and resulted in & gt;90% apoptosis. In summary, ritonavir increases the level of ER stress induced by bortezomib, which sensitizes bortezomib-resistant cells to bortezomib-induced apoptosis. Ritonavir may therefore be tested clinically to improve the sensitivity of solid malignancies toward bortezomib treatment. [Mol Cancer Ther 2008;7(7):1940–8]
    Type of Medium: Online Resource
    ISSN: 1535-7163 , 1538-8514
    Language: English
    Publisher: American Association for Cancer Research (AACR)
    Publication Date: 2008
    detail.hit.zdb_id: 2062135-8
    SSG: 12
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  • 9
    In: BMC Research Notes, Springer Science and Business Media LLC, Vol. 7, No. 1 ( 2014-12)
    Abstract: While paraneoplastic leukocytosis is a common phenomenon in solid tumors, extreme elevations of white blood counts (WBC) in the range of more than 100,000/μl are uncommon in patients with non-hematologic malignancies. Leukocytosis with mature neutrophils due to a granulocyte colony-stimulating factor (G-CSF) producing tumor is only seen on rare occasions. Case presentation Massive neutrophil leukocytosis of approximately 100,000/μl was diagnosed in a 57-year-old Caucasian woman with metastatic undifferentiated endometrial sarcoma. A bone marrow trephine biopsy revealed massively increased granulopoiesis, but no evidence of monoclonal myeloproliferative disease. After the primary tumor had been resected, white blood count (WBC) plummeted and went back to nearly normal levels within one week. With progressive metastatic disease, granulocyte colony-stimulating factor (G-CSF) plasma levels were found to be increased by 10-fold. White blood count (WBC) strictly correlated with tumor burden and response to chemotherapy. In the final stage of treatment resistent disease, white blood count (WBC) approximated 300,000/μl. Conclusion We report on a granulocyte colony-stimulating factor (G-CSF) secreting undifferentiated endometrial sarcoma, which was associated with extreme neutrophil counts. White blood count (WBC) were closely correlated with tumor burden and associated with an aggressive clinical course. We suggest that paraneoplastic neutrophilia represents a poor prognostic sign in soft tissue sarcoma. In patients with similar constellations, antitumor therapy must not be delayed.
    Type of Medium: Online Resource
    ISSN: 1756-0500
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2014
    detail.hit.zdb_id: 2413336-X
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  • 10
    In: Journal of Clinical Medicine, MDPI AG, Vol. 11, No. 1 ( 2022-01-05), p. 270-
    Abstract: Immune cell reconstitution after stem cell transplantation is allocated over several stages. Whereas cells mediating innate immunity recover rapidly, adaptive immune cells, including T and B cells, recover slowly over several months. In this study we investigated kinetics and reconstitution of de novo B cell formation in patients receiving CD3 and CD19 depleted haploidentical stem cell transplantation with additional in vivo T cell depletion with monoclonal anti-CD3 antibody. This model enables a detailed in vivo evaluation of hierarchy and attribution of defined lymphocyte populations without skewing by mTOR- or NFAT-inhibitors. As expected CD3+ T cells and their subsets had delayed reconstitution ( 〈 100 cells/μL at day +90). Well defined CD19+ B lymphocytes of naïve and memory phenotype were detected at day +60. Remarkably, we observed a very early reconstitution of antibody-secreting cells (ASC) at day +14. These ASC carried the HLA-haplotype of the donor and secreted the isotypes IgM and IgA more prevalent than IgG. They correlated with a population of CD19− CD27− CD38low/+ CD138− cells. Of note, reconstitution of this ASC occurred without detectable circulating T cells and before increase of BAFF or other B cell stimulating factors. In summary, we describe a rapid reconstitution of peripheral blood ASC after CD3 and CD19 depleted haploidentical stem cell transplantation, far preceding detection of naïve and memory type B cells. Incidence before T cell reconstitution and spontaneous secretion of immunoglobulins allocate these early ASC to innate immunity, eventually maintaining natural antibody levels.
    Type of Medium: Online Resource
    ISSN: 2077-0383
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2662592-1
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