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Immunological and functional characterization of Multipotent Mesenchymal Stromal Cells in myeloproliferative neoplasms

Grant number: 18/01756-5
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): December 01, 2018
Effective date (End): November 30, 2020
Field of knowledge:Health Sciences - Medicine
Principal Investigator:Fabíola Attié de Castro
Grantee:Maira da Costa Cacemiro
Home Institution: Faculdade de Ciências Farmacêuticas de Ribeirão Preto (FCFRP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil


Myeloproliferative neoplasms (MPN) are hematological disorders characterized by increased cell proliferation and accumulation of mature and precursor myeloid cells in peripheral blood independently of cytokine stimuli and growth factors.The discovery of genetic mutations since 2005 has contributed to the elucidation of the physiopathology of MPN. However, despite the knowledge accumulated in the last decade, there is still a need to elucidate the cellular and molecular mechanisms that contribute to the appearance and progression of this group of diseases, including alterations of the hematopoietic niche.Although dysregulated hematopoiesis present in MPN is mainly attributed to molecular changes in the hematopoietic stem cell (HSC), the abnormality of the medullary microenvironment seems to be important in the development of these diseases. The stromal microenvironment of the bone marrow is composed of extracellular matrix and specialized cells, with emphasis on the mesenchymal stromal cells (MSC) that guarantee the maintenance of the potential for self-renewal and pool of HTC. MSC contribute to the quiescence of HSC, protecting them from pro-apoptotic stimuli and differentiation. In addition to genetic alterations in HSC and changes in the microenvironment, it is also considered that MPN are onco-inflammatory diseases and are characterized by abnormal activity of the immune system.Therefore, our hypothesis is that alterations in the immunomodulatory profile of MSC, as well as structural or expression changes of components of the hematopoietic marrow niche contribute to the physiopathology of MPN. We believe that MSC can modulate the hematopoietic niche by means of cytokines, lipid mediators and growth factors, capable of altering the functioning and structure of the medullary microenvironment, favoring the neo-angiogenesis and proliferation of neoplastic myeloid cells.The present project will evaluate the immunomodulatory potential of the multipotent mesenchymal stromal cells of MPN aiming to establish the relationship between the alteration of the hematopoietic microenvironment and the physiopathology of MPN.

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
COMINAL, JUCARA GASTALDI; CACEMIRO, MAIRA DA COSTA; PINTO-SIMOES, BELINDA; KOLB, HANS-JOCHEM; RIBEIRO MALMEGRIM, KELEN CRISTINA; DE CASTRO, FABIOLA ATTIE. Emerging Role of Mesenchymal Stromal Cell-Derived Extracellular Vesicles in Pathogenesis of Haematological Malignancies. STEM CELLS INTERNATIONAL, 2019. Web of Science Citations: 0.

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