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Engström, Maria
Publications (8 of 8) Show all publications
Uvdal, K., Ahrén, M., Selegård, L., Abrikossova, N., Klasson, A., Söderlind, F., . . . Käll, P.-O. (2008). Functionalized Gd2O3 Nanoparticles to Be used for MRI Contrast Enhancement. In: AVS,2008.
Open this publication in new window or tab >>Functionalized Gd2O3 Nanoparticles to Be used for MRI Contrast Enhancement
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2008 (English)In: AVS,2008, 2008Conference paper, Published paper (Other academic)
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-44596 (URN)77166 (Local ID)77166 (Archive number)77166 (OAI)
Note
Conference proceedingsAvailable from: 2009-10-10 Created: 2009-10-10 Last updated: 2010-07-01
Ahrén, M., Olsson, P., Söderlind, F., Klasson, A., Petoral, R. J., Engström, M., . . . Uvdal, K. (2007). Rare earth nanoparticles as contrast agent in MRI: Nanomaterial design and biofunctionalization. In: IVC-17/ICSS-13 ICNT,2007.
Open this publication in new window or tab >>Rare earth nanoparticles as contrast agent in MRI: Nanomaterial design and biofunctionalization
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2007 (English)In: IVC-17/ICSS-13 ICNT,2007, 2007Conference paper, Published paper (Other academic)
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-44593 (URN)77163 (Local ID)77163 (Archive number)77163 (OAI)
Note
Conference proceedingsAvailable from: 2009-10-10 Created: 2009-10-10 Last updated: 2010-07-01
Ekoff, M., Kaufmann, T., Engström, M., Motoyama, N., Villunger, A., Jönsson, J.-I., . . . Nilsson, G. (2007). The BH3-only protein Puma plays an essential role in cytokine deprivation-induced apoptosis of mast cells. Blood, 110(9), 3209-3217
Open this publication in new window or tab >>The BH3-only protein Puma plays an essential role in cytokine deprivation-induced apoptosis of mast cells
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2007 (English)In: Blood, ISSN 0006-4971, E-ISSN 1528-0020, Vol. 110, no 9, p. 3209-3217Article in journal (Refereed) Published
Abstract [en]

Mast cells play critical roles in the regulation of inflammation. One characteristic feature of mast cells is their relatively long lifespan in vivo. Members of the Bcl-2 protein family are regulators of cell survival and apoptosis, where the BH3-only proteins are critical proapoptotic proteins. In this study we investigated the role of the BH3-only proteins Noxa, Bad, Bim, Bmf, Bid, and Puma in apoptosis of mucosal-like mast cells (MLMCs) and connective tissue-like mast cells (CTLMCs). We demonstrate that Puma is critical for the induction of mast-cell death following cytokine deprivation and treatment with the DNA-damaging agent etoposide in MLMCs and CTLMCs. Using p53-/- mast cells, we found that cytokine deprivation-induced apoptosis, in contrast to that elicited by etoposide, is p53-independent. Interestingly, mast cells deficient in FOXO3a, previously proposed as a transcription factor for Puma induction in response to growth factor deprivation, were markedly resistant to cytokine withdrawal compared with wildtype cells. Moreover, overexpression of phosphorylation-deficient, constitutively active FOXO3a caused an up-regulation of Puma. In conclusion, our data demonstrate a pivotal role for Puma in the regulation of cytokine deprivation-induced mast-cell apoptosis and suggest a plausible role for Puma in the regulation of mast cell numbers in vivo. © 2007 by The American Society of Hematology.

National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-39823 (URN)10.1182/blood-2007-02-073957 (DOI)51399 (Local ID)51399 (Archive number)51399 (OAI)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2017-12-13
Uvdal, K., Ahrén, M., Söderlind, F., Klasson, A., Vahlberg, C., Petoral, R. J., . . . Käll, P.-O. (2006). Functionalized rare earth nanocrystals for MRI contrast enhancement. In: e-MRS,2006.
Open this publication in new window or tab >>Functionalized rare earth nanocrystals for MRI contrast enhancement
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2006 (English)In: e-MRS,2006, 2006Conference paper, Published paper (Other academic)
Abstract [en]

  

National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-44597 (URN)77168 (Local ID)77168 (Archive number)77168 (OAI)
Note
Invited talkerAvailable from: 2009-10-10 Created: 2009-10-10 Last updated: 2010-07-02
Moller, C., Alfredsson, J., Engström, M., Wootz, H., Xiang, Z., Lennartsson, J., . . . Nilsson, G. (2005). Stem cell factor promotes mast cell survival via inactivation of FOXO3a-mediated transcriptional induction and MEK-regulated phosphorylation of the proapoptotic protein Bim. Blood, 106(4), 1330-1336
Open this publication in new window or tab >>Stem cell factor promotes mast cell survival via inactivation of FOXO3a-mediated transcriptional induction and MEK-regulated phosphorylation of the proapoptotic protein Bim
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2005 (English)In: Blood, ISSN 0006-4971, E-ISSN 1528-0020, Vol. 106, no 4, p. 1330-1336Article in journal (Refereed) Published
Abstract [en]

Mast cells are found in tissues throughout the body where they play important roles in the regulation of inflammatory responses. One characteristic feature of mast cells is their longevity. Although it is well established that mast cell survival is dependent on stem cell factor (SCF), it has not been described how this process is regulated. Herein, we report that SCF promotes mast cell survival through inactivation of the Forkhead transcription factor FOXO3a (forkhead box, class O3A) and down-regulation and phosphorylation of its target Bim (Bcl-2 [B-cell lymphoma-2] interacting modulator of cell death), a Bcl-2 homology 3 (BH3)-only proapoptotic protein. SCF induced a rapid and transient phosphorylation of Akt (protein kinase B) and FOXO3a. SCF treatment prevented up-regulation of Bim protein expression and led to increased Bim phosphorylation. Bim phosphorylation was inhibited by PD98059 and LY294002 treatment, suggesting the involvement of mitogen-activated protein kinase kinase/mitogen-activated protein kinase (MEKJMAPK) and phosphatidylinositol 3 (PI3)-kinase pathways in this process. Overexpression of phosphorylation-deficient FOXO3a caused an up-regulation of Bim and induced mast cell apoptosis even in the presence of SCF. Mast cell apoptosis induced by the phosphorylation-deficient FOXO3a was attenuated in bim(-/-) mast cells. Because apoptosis is abnormally reduced in bim(-/-) mast cells, these data provide evidence that Akt-mediated inhibition of FOXO3a and its transcription target Bim provides an important mechanism by which SCF acts to prevent apoptosis in mast cells.

National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-46082 (URN)10.1182/blood-2004-12-4792 (DOI)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13
Jönsson, M., Engström, M. & Jönsson, J.-I. (2004). FLT3 ligand regulates apoptosis through AKT-dependent inactivation of transcription factor FoxO3. Biochemical and Biophysical Research Communications - BBRC, 318(4), 899-903
Open this publication in new window or tab >>FLT3 ligand regulates apoptosis through AKT-dependent inactivation of transcription factor FoxO3
2004 (English)In: Biochemical and Biophysical Research Communications - BBRC, ISSN 0006-291X, E-ISSN 1090-2104, Vol. 318, no 4, p. 899-903Article in journal (Refereed) Published
Abstract [en]

Proliferation, differentiation, and survival of hematopoietic cells are regulated by cytokines, acting through specific receptors. FLT3 ligand (FL) is one of the most important cytokines for regulation of the hematopoietic system, and its receptor FLT3 is expressed on both stem cells and progenitors. Regulation of Forkhead transcription factors has been described as an important mechanism to control apoptosis and cell cycle progression in hematopoietic progenitors. Here we report that FL induces AKT/PKB activation, which in turn phosphorylates and thereby inactivates the Forkhead protein FoxO3 in the progenitor cell line FDC-P1 stably expressing murine FLT3 receptor. Phosphorylation of AKT and FoxO3 was blocked by the PI-3 kinase inhibitor LY294002 but not by the MAP kinase inhibitor PD98059. Expression of a mutated FoxO3, in which all three inhibitory phosphorylation sites were mutated to alanine, led to rapid increase of apoptotic cells in the presence of FL. These results suggest that FL-induced regulation of apoptosis is executed by FoxO3.

National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-22314 (URN)10.1016/j.bbrc.2004.04.110 (DOI)1508 (Local ID)1508 (Archive number)1508 (OAI)
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2017-12-13
Uvdal, K. & Engström, M. (2004). Nanoscale particles made of a transition metal and/or rare earth metal compound. .
Open this publication in new window or tab >>Nanoscale particles made of a transition metal and/or rare earth metal compound
2004 (English)Patent (Other (popular science, discussion, etc.))
Abstract [en]

 US provinsional application

National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-42237 (URN)61703 (Local ID)61703 (Archive number)61703 (OAI)
Patent
(2004-09-14)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2010-07-02
Uvdal, K., Petoral, R. J., Söderlind, F., Käll, P.-O., Konradsson, P. & Engström, M. (2003). Magnetic circular X-ray dichroism of Gd2O3 nano particles. In: AVS,2003.
Open this publication in new window or tab >>Magnetic circular X-ray dichroism of Gd2O3 nano particles
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2003 (English)In: AVS,2003, 2003Conference paper, Published paper (Other academic)
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-44590 (URN)77160 (Local ID)77160 (Archive number)77160 (OAI)
Note
Conference proceedingsAvailable from: 2009-10-10 Created: 2009-10-10 Last updated: 2010-07-01
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