期刊
FRONTIERS IN CELL AND DEVELOPMENTAL BIOLOGY
卷 9, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fcell.2021.739357
关键词
hematopoiesis; blood cell progenitor; Drosophila; imago; Collier
资金
- Agence Nationale de la Recherche [ANR 13-BSV3-08, 17-CE12-0030-03]
- i-Site CAP20-25 and the Indo-French Centre for the Promotion of Advanced Research [IFCPAR/CEFIPRA 5503-1]
- Universite Clermont-Auvergne and the Fondation pour la Recherche Medicale (FRM)
The study reveals that the hematopoietic system of adult fruit flies is mainly composed of a few distinct mature blood cell types, which some of them are derived from a specialized population of cells present in the larval lymph gland. These cells, normally quiescent, can differentiate and proliferate in response to bacterial infection.
While many studies have described Drosophila embryonic and larval blood cells, the hematopoietic system of the imago remains poorly characterized and conflicting data have been published concerning adult hematopoiesis. Using a combination of blood cell markers, we show that the adult hematopoietic system is essentially composed of a few distinct mature blood cell types. In addition, our transcriptomics results indicate that adult and larval blood cells have both common and specific features and it appears that adult hemocytes reactivate many genes expressed in embryonic blood cells. Interestingly, we identify a small set of blood cells that does not express differentiation markers but rather maintains the expression of the progenitor marker domeMeso. Yet, we show that these cells are derived from the posterior signaling center, a specialized population of cells present in the larval lymph gland, rather than from larval blood cell progenitors, and that their maintenance depends on the EBF transcription factor Collier. Furthermore, while these cells are normally quiescent, we find that some of them can differentiate and proliferate in response to bacterial infection. In sum, our results indicate that adult flies harbor a small population of specialized cells with limited hematopoietic potential and further support the idea that no substantial hematopoiesis takes place during adulthood.
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