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Human natural killer cell development in a xenogeneic culture system
Isabel Barão1, Fátima Vaz, Graça Almeida-Porada
1University of Nevada School of Medicine, V.A. Medical Center, Reno, USA.
British Journal of Haematology
|August 16, 2002
Summary
Fetal sheep thymic stroma supports human natural killer (NK) cell development from bone marrow progenitors in vitro. Interleukin-2 (IL-2) enhances NK cell generation and function, with immature progenitors requiring direct stroma contact.
Area of Science:
- Immunology
- Developmental Biology
- Hematopoiesis
Background:
- Xenogeneic models demonstrate non-human environments can support human hematopoiesis.
- Fetal sheep thymic stroma is investigated for its potential in supporting human hematopoietic progenitor development.
Purpose of the Study:
- To evaluate the effect of fetal sheep thymic stroma on in vitro development of human natural killer (NK) cells.
- To assess the role of interleukin-2 (IL-2) and direct stroma contact in NK cell differentiation and function.
Main Methods:
- Human bone marrow progenitors (CD34+DR+Lin- and CD34+DR-Lin-) were cultured with or without IL-2 on fetal sheep thymic stroma.
- Cultures included direct contact and transwell systems.
- NK cell generation (CD45+CD56+) and cytotoxicity against K562 targets were assessed.
Main Results:
- Both progenitor types generated NK cells, with IL-2 significantly increasing NK cell percentage.
- Direct contact with stroma was crucial for the differentiation of immature CD34+DR-Lin- progenitors into NK cells.
- IL-2-cultured NK cells exhibited cytotoxicity, with those from immature progenitors being more potent.
Conclusions:
- Fetal sheep thymic stroma promotes human NK cell generation from hematopoietic progenitors in vitro.
- IL-2 enhances NK cell development and function.
- These findings have implications for understanding NK cell ontogeny and inducing tolerance in transplantation.