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Published on: August 15, 2019
[Bipartite organization of human lymphopoiesis]
Kutaiba Alhaj Hussen1, Emna Chabaane1, Bruno Canque1
1Inserm U1126, université Paris-Diderot, école pratique des hautes études/Paris Sciences et Lettres (PSL research university), institut universitaire d'hématologie, hôpital Saint-Louis, 1, avenue Claude Vellefaux, 75010 Paris, France.
Insights
Human hematopoiesis is complex. Researchers discovered two distinct early lymphoid progenitor (ELP) populations, CD127-negative and CD127-positive, that independently develop into diverse lymphoid cells, revealing a bipartite structure in human lymphopoiesis.
Area of Science:
- Immunology
- Developmental Biology
- Hematopoiesis
Background:
- Human bone marrow access is limited, hindering hematopoiesis research compared to mouse models.
- Previous studies lacked detailed characterization of early human lymphoid progenitor populations.
Purpose of the Study:
- To characterize the developmental architecture of human lymphopoiesis.
- To identify distinct progenitor populations within early human lymphoid development.
Main Methods:
- Utilized an in vivo humanized mouse model to study fetal hematopoiesis.
- Analyzed functionally specialized populations of CD127-negative and CD127-positive early lymphoid progenitors (ELPs).
Main Results:
- Identified two functionally specialized ELP populations: CD127-negative and CD127-positive.
- Demonstrated independent differentiation, differential growth factor response, and divergent lineage restriction of these ELP populations.
- Showed that these ELPs generate distinct lymphoid cell subsets.
Conclusions:
- Human lymphopoiesis exhibits a bipartite developmental architecture, distinct from mouse models.
- The CD127-negative and CD127-positive ELPs represent key branches in human lymphoid development.
- This finding provides a new framework for understanding human immune cell generation.
Abstract:
Due to difficulties to access primary bone marrow samples, human hematopoiesis has long remained far less characterized than in the mouse. Using an in vivo modeling approach of fetal hematopoiesis in humanized mice, we recently showed that human lymphoid cells stem from two functionally specialized populations of CD127- and CD127+ early lymphoid progenitors (ELP) that differentiate independently, respond differently to growth factors, undergo divergent modes of lineage restriction and generate distinct lymphoid populations. Our results demonstrate that, conversely to the mouse, human lymphopoiesis displays a bipartite developmental architecture.
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