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Wellcome - MRC Cambridge Stem Cell Institute

 

107-Mendez-Ferrer-2017Dr Simón Méndez-Ferrer

Blood stem cell niches

Email: sm2116@cam.ac.uk

Laboratory: Cambridge Stem Cell Institute, Jeffrey Cheah Biomedical Centre

Departmental Affiliation: Haematology

 

Biography

Méndez-Ferrer has discovered a connection with bone marrow, the brain and other systemic signals which controls the behaviour of blood stem cells.  His research has contributed to the dissection of the "niches" in which stem cells reside and to the understanding of the role of these niches in the development of myeloproliferative diseases. 

 

Funding

ERC, NHS Blood and Transplant, Cancer Research UK, MRC

 

External links

https://www.haem.cam.ac.uk/staff/senior-staff/dr-simon-mendez-ferrer/

https://crukcambridgecentre.org.uk/users/simon-mendez-ferrer

 

Main features of anatomically-defined haematopoietic stem cell niches in the mouse bone marrow. Schematic summarising the key cell types and functional features of the central and endosteal bone marrow (BM) niches of haematopoietic stem cells (HSCs). Mesenchymal stem cells (MSCs) give rise to bone-forming cells (osteoblasts) and fat cells (adipocytes), whereas bone-resorbing cells (osteoclasts) share a monocytic origin with macrophages. Nes-GFPhi NG2+ MSCs are associated with endosteal transition zone vessels and arterioles located throughout the BM, whereas Nes-GFPlo LEPR+ CAR MSCs are associated with sinusoids in the central BM. Sympathetic nerve fibres regulate the migration of HSCs through the sinusoids. Different MSC subpopulations, endothelial cells, non-myelinating Schwann cells and megakaryocytes might contribute to regulate the balance between HSC proliferation and quiescence during daily or regenerative haematopoiesis. Changes in specialized BM niches might directly affect myeloid versus lymphoid output, and the imbalanced production of mature haematopoietic cells at specific niches might in turn remodel the local microenvironment for these cells. During ageing, the landscape of the mouse HSC niche changes substantially. Specifically, the central niche expands with morphological and functional changes including an increase in noradrenergic fibres, capillaries with Nes-GFP+ MSCs, HSC proliferation and myelopoiesis. In contrast, the endosteal niche and its associated components and functions are reduced with concomitant decreases in transition zone vessels and arterioles, HSC quiescence and self-renewal, resistance to genotoxic stress, regenerative haematopoiesis and lymphopoiesis (Credit Mendez-Ferrer S et al. Nat Rev Cancer 2020;20(5):285-98).

 

Research

The Méndez-Ferrer laboratory research focuses on the regulation of the haematopoietic stem-cell niche in health and disease.  Blood stem cells reside in specialised niches which allows them to self-renew, proliferate, differentiate and migrate according to the organism's requirements. The group studies multisystem regulatory mechanisms by which the haematopoietic stem cell niche fulfils these complex functions and how the deregulation of these mechanisms contributes to haematological disorders. A connection was established between the bone marrow, the brain and other systemic signals, which regulate the behaviour of haematopoietic stem cells (HSCs). Additionally, the group has demonstrated that mesenchymal stem cells (MSCs) are very important in supporting and regulating HSCs. This is also the case for malignant HSCs that can cause myeloproliferative disorders, such as myeloproliferative neoplasms (MPNs) and acute myeloid leukaemia (AML). The group found that malignant HSCs damage their niche to drive disease progression, prompting for strategies targeting the niche, which are under clinical evaluation. Current group’s efforts focus on the neuro-endocrine regulation of the HSC niches to improve HSC transplantation procedures and the treatment of myeloproliferative neoplasias.

 

 

Group Members

Claire Fielding, Elodie Grockowiak, Stephen Gadomski, Eman Khatib-Massalha, Yi-Joung Sarah Lee, Zijian Fang, Livia Lisi Vega, Jiang Cui, Rebecca France         

 

Plain English

Our research focuses on the regulation of the environment (‘niche’) in which the blood stem cells reside both in health and disease. Blood stem cells are located in specialised niches which allow them to function according to the organism's requirements. We study the mechanisms of how the stem cell niche fulfills these complex functions. Through this, we aim to understand how the disruption of these mechanisms contributes to blood disorders.

 

Key Publications