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Tsapogas, Panagiotis
Publications (7 of 7) Show all publications
Zandi, S., Åhsberg, J., Tsapogas, P., Stjernberg, J., Qian, H. & Sigvardsson, M. (2012). Single-cell analysis of early B-lymphocyte development suggests independent regulation of lineage specification and commitment in vivo. Proceedings of the National Academy of Sciences of the United States of America, 109(39), 15871-15876
Open this publication in new window or tab >>Single-cell analysis of early B-lymphocyte development suggests independent regulation of lineage specification and commitment in vivo
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2012 (English)In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 109, no 39, p. 15871-15876Article in journal (Refereed) Published
Abstract [en]

To better understand the process of B-lymphocyte lineage restriction, we have investigated molecular and functional properties in early B-lineage cells from Pax-5-deficient animals crossed to a B-lineage-restricted reporter mouse, allowing us to identify B-lineage-specified progenitors independently of conventional surface markers. Pax-5 deficiency resulted in a dramatic increase in the frequency of specified progenitor B-cellsmarked by expression of a lambda 5 (Igll1) promoter-controlled reporter gene. Gene expression analysis of ex vivo isolated progenitor cells revealed that Pax-5 deficiency has a minor impact on B-cell specification. However, single-cell in vitro differentiation analysis of ex vivo isolated cells revealed that specified B-lineage progenitors still displayed a high degree of plasticity for development into NK or T lineage cells. In contrast, we were unable to detect any major changes in myeloid lineage potential in specified Pax-5-deficient cells. By comparison of gene expression patterns in ex vivo isolated Pax-5-and Ebf-1-deficient progenitors, it was possible to identify a set of B-cell-restricted genes dependent on Ebf-1 but not Pax-5, supporting the idea that B-cell specification and commitment is controlled by distinct regulatory networks.

Place, publisher, year, edition, pages
National Academy of Sciences, 2012
Keywords
transcription, Notch-1, Deltex
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-85090 (URN)10.1073/pnas.1210144109 (DOI)000309604500070 ()
Note

Funding Agencies|Swedish Cancer Society||Swedish Research Council||Swedish Childhood Cancer Foundation||faculty of Medicine at Linkoping University||

Available from: 2012-11-02 Created: 2012-11-02 Last updated: 2017-12-07
Tsapogas, P., Zandi, S., Åhsberg, J., Zetterblad, J., Welinder, E., Jönsson, J.-I., . . . Sigvardsson, M. (2011). IL-7 mediates Ebf-1-dependent lineage restriction in early lymphoid progenitors. Blood, 118(5), 1283-1290
Open this publication in new window or tab >>IL-7 mediates Ebf-1-dependent lineage restriction in early lymphoid progenitors
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2011 (English)In: Blood, ISSN 0006-4971, E-ISSN 1528-0020, Vol. 118, no 5, p. 1283-1290Article in journal (Refereed) Published
Abstract [en]

eficiencies in the IL-7 signaling pathway result in severe disruptions of lymphoid development in adult mice. To understand more about how IL-7 deficiency impacts early lymphoid development, we have investigated lineage restriction events within the common lymphoid progenitor (CLP) compartment in IL-7 knockout mice. This revealed that although IL-7 deficiency had a minor impact on the development of LY6D(-) multipotent CLPs, the formation of the lineage restricted LY6D(+) CLP population was dramatically reduced. This was reflected in a low-level transcription of B-lineage genes as well as in a loss of functional B-cell commitment. The few Ly6D(+) CLPs developed in the absence of IL-7 displayed increased lineage plasticity and low expression of Ebf-1. Absence of Ebf-1 could be linked to increased plasticity because even though Ly6D(+) cells develop in Ebf-1-deficient mice, these cells retain both natural killer and dendritic cell potential. This reveals that IL-7 is essential for normal development of Ly6D(+) CLPs and that Ebf-1 is crucial for lineage restriction in early lymphoid progenitors.

Place, publisher, year, edition, pages
American Society of Hematology, 2011
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-70104 (URN)10.1182/blood-2011-01-332189 (DOI)000293510000020 ()
Available from: 2011-08-19 Created: 2011-08-19 Last updated: 2017-12-08
Åhsberg, J., Tsapogas, P., Qian, H., Zetterblad, J., Zandi, S., Mansson, R., . . . Sigvardsson, M. (2010). Interleukin-7-induced Stat-5 Acts in Synergy with Flt-3 Signaling to Stimulate Expansion of Hematopoietic Progenitor Cells. JOURNAL OF BIOLOGICAL CHEMISTRY, 285(47), 36275-36284
Open this publication in new window or tab >>Interleukin-7-induced Stat-5 Acts in Synergy with Flt-3 Signaling to Stimulate Expansion of Hematopoietic Progenitor Cells
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2010 (English)In: JOURNAL OF BIOLOGICAL CHEMISTRY, ISSN 0021-9258, Vol. 285, no 47, p. 36275-36284Article in journal (Refereed) Published
Abstract [en]

The development of lymphoid cells from bone marrow progenitors is dictated by interplay between internal cues such as transcription factors and external signals like the cytokines Flt-3 ligand and Il-7. These proteins are both of large importance for normal lymphoid development; however, it is unclear if they act in direct synergy to expand a transient Il-7R(+)Flt-3(+) population or if the collaboration is created through sequential activities. We report here that Flt-3L and Il-7 synergistically stimulated the expansion of primary Il-7R(+)Flt-3(+) progenitor cells and a hematopoietic progenitor cell line ectopically expressing the receptors. The stimulation resulted in a reduced expression of pro-apoptotic genes and also mediated survival of primary progenitor cells in vitro. However, functional analysis of single cells suggested that the anti-apoptotic effect was additive indicating that the synergy observed mainly depends on stimulation of proliferation. Analysis of downstream signaling events suggested that although Il-7 induced Stat-5 phosphorylation, Flt-3L caused activation of the ERK and AKT signaling pathways. Flt-3L could also drive proliferation in synergy with ectopically expressed constitutively active Stat-5. This synergy could be inhibited with either receptor tyrosine kinase or MAPK inhibitors suggesting that Flt-3L and Il-7 act in synergy by activation of independent signaling pathways to expand early hematopoietic progenitors.

Place, publisher, year, edition, pages
The American Society for Biochemistry and Molecular Biology, 2010
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-62734 (URN)10.1074/jbc.M110.155531 (DOI)000284146100037 ()20829349 (PubMedID)
Available from: 2010-12-03 Created: 2010-12-03 Last updated: 2015-02-16
Månsson, R., Zandi, S., Welinder, E., Tsapogas, P., Sakaguchi, N., Bryder, D. & Sigvardsson, M. (2010). Single-cell analysis of the common lymphoid progenitor compartment reveals functional and molecular heterogeneity. Blood, 115(13), 2601-2609
Open this publication in new window or tab >>Single-cell analysis of the common lymphoid progenitor compartment reveals functional and molecular heterogeneity
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2010 (English)In: Blood, ISSN 0006-4971, E-ISSN 1528-0020, Vol. 115, no 13, p. 2601-2609Article in journal (Refereed) Published
Abstract [en]

To investigate molecular events involved in the regulation of lymphoid lineage commitment, we crossed lambda 5 reporter transgenic mice to Rag1-GFP knockin mice. This allowed us to subfractionate common lymphoid progenitors and pre-pro-B (fraction A) cells into lambda 5(-)Rag1(low), lambda 5(-)Rag1(high), and lambda 5(+)Rag1(high) cells. Clonal in vitro differentiation analysis demonstrated that Rag1(low) cells gave rise to B/T and NK cells. Rag1(high) cells displayed reduced NK-cell potential with preserved capacity to generate B- and T-lineage cells, whereas the lambda 5(+) cells were B-lineage restricted. Ebf1 and Pax5 expression was largely confined to the Rag1high populations. These cells also expressed a higher level of the surface protein LY6D, providing an additional tool for the analysis of early lymphoid development. These data suggest that the classic common lymphoid progenitor compartment composes a mixture of cells with relatively restricted lineage potentials, thus opening new possibilities to investigate early hematopoiesis.

Place, publisher, year, edition, pages
American Society of Hematology, 2010
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-54870 (URN)10.1182/blood-2009-08-236398 (DOI)000276201000009 ()
Available from: 2010-04-16 Created: 2010-04-16 Last updated: 2017-12-12
Zandi, S., Zetterblad, J., Tsapogas, P., Månsson, R. & Sigvardsson, M. (2010). Temporal and Sequential Expression of EBF1 and PAX5 Restricts the Non B Cell Fate In Early Lymphopoiesis. In: BLOOD vol 116, issue 21 (ISSN 0006-4971). Paper presented at 52nd Annual Meeting of the American-Society-of-Hematology (ASH) Orlando, FL USA December 04-07, 2010 (pp. 1581-1581). American Society of Hematology, 116(21)
Open this publication in new window or tab >>Temporal and Sequential Expression of EBF1 and PAX5 Restricts the Non B Cell Fate In Early Lymphopoiesis
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2010 (English)In: BLOOD vol 116, issue 21 (ISSN 0006-4971), American Society of Hematology , 2010, Vol. 116, no 21, p. 1581-1581Conference paper, Oral presentation only (Refereed)
Place, publisher, year, edition, pages
American Society of Hematology, 2010
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-67569 (URN)000285025204287 ()
Conference
52nd Annual Meeting of the American-Society-of-Hematology (ASH) Orlando, FL USA December 04-07, 2010
Available from: 2011-04-18 Created: 2011-04-18 Last updated: 2012-05-31
Zandi, S., Månsson, R., Tsapogas, P., Zetterblad, J., Bryder, D. & Sigvardsson, M. (2008). EBF1 is essential for B-lineage priming and establishment of a transcription factor network in common lymphoid progenitors. Journal of Immunology, 181(5), 3364-3372
Open this publication in new window or tab >>EBF1 is essential for B-lineage priming and establishment of a transcription factor network in common lymphoid progenitors
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2008 (English)In: Journal of Immunology, ISSN 0022-1767, E-ISSN 1550-6606, Vol. 181, no 5, p. 3364-3372Article in journal (Refereed) Published
Abstract [en]

Development of B-lymphoid cells in the bone marrow is a process under strict control of a hierarchy of transcription factors. To understand the development of a B-lymphoid-restricted functional network of transcription factors, we have investigated the cell autonomous role of the transcription factor EBF1 in early B cell development. This revealed that even though transplanted EBF1-deficient fetal liver cells were able to generate common lymphoid progenitors (CLPs) as well as B220(+)CD43(+)AA4.1(+) candidate precursor B cells, none of these populations showed signs of B lineage priming. The isolated CLPs were able to generate T lymphocytes in vitro supporting the idea that the phenotype of EBF1-deficient mice is restricted to the development of the B lineage. Furthermore, EBF deficient CLPs displayed a reduction in Ig H chain recombination as compared with their wild-type counterpart and essentially lacked transcription of B-lineage-associated genes. Among the genes displaying reduced expression in the EBF1 deficient CLPs were the transcription factors Pax5, Pou2af1 (OcaB), and FoxO1 that all appear to be direct genetic targets for EBF1 because their promoters contained functional binding sites for this factor. This leads us to suggest that EBF1 regulates a transcription factor network crucial for B lineage commitment.

Keywords
Animals B-Lymphocytes/*cytology Cell Lineage Down-Regulation *Gene Regulatory Networks Lymphoid Progenitor Cells/*cytology Mice Precursor Cells, B-Lymphoid/cytology T-Lymphocytes/cytology Trans-Activators/*physiology Transcription Factors/genetics
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-43426 (URN)73828 (Local ID)73828 (Archive number)73828 (OAI)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2017-12-13
Tsapogas, P., Zandi, S., Åhsberg, J., Welinder, E., Månsson, R., Qian, H. & Sigvardsson, M.Functional and molecular analysis of B-lineage commitment suggests an instructive role for Il-7 in the earliest lymphoid restricted cells.
Open this publication in new window or tab >>Functional and molecular analysis of B-lineage commitment suggests an instructive role for Il-7 in the earliest lymphoid restricted cells
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Deficiencies in the Il-7 signaling pathway result in severe disruptions of lymphoid development in adult mice. In order to understand how Il-7 deficiency impacts early lymphoid development we have investigated lineage restriction events within the CLP compartment of Il-7 knock out mice. This revealed that while Il-7 deficiency had a minor impact on the development and functional properties of LY6D- multipotent CLPs, the formation of the lineage restricted LY6D+ CLP population was dramatically reduced. This was reflected in a low level transcription of B-lineage genes as well as in a loss of functional B-cell commitment in developing progenitors. The defect could not be rescued by ectopic expression of Bcl-2 suggesting that the cytokine act in an instructive manner in early lymphoid development. This clarifies the role of Il-7 in early lymphoid development and puts emphasis on the relevance of the recently defined lineage restricted progenitor cells in lymphoid differentiation.

National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-61589 (URN)
Available from: 2010-11-17 Created: 2010-11-17 Last updated: 2010-11-17
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