Lymphoid precursors are directed to produce dendritic cells as a result of TLR9 ligation during herpes infection.

Abstract:

:Hematopoietic stem and progenitor cells were previously found to express Toll-like receptors (TLRs), suggesting that bacterial/viral products may influence blood cell formation. We now show that common lymphoid progenitors (CLPs) from mice with active HSV-1 infection are biased to dendritic cell (DC) differentiation, and the phenomenon is largely TLR9 dependent. Similarly, CLPs from mice treated with the TLR9 ligand CpG ODN had little ability to generate CD19+ B lineage cells and had augmented competence to generate DCs. TNFalpha mediates the depletion of late-stage lymphoid progenitors from bone marrow in many inflammatory conditions, but redirection of lymphopoiesis occurred in TNFalpha-/- mice treated with CpG ODN. Increased numbers of DCs with a lymphoid past were identified in Ig gene recombination substrate reporter mice treated with CpG ODN. TLR9 is highly expressed on lymphoid progenitors, and culture studies revealed that those receptors, rather than inflammatory cytokines, accounted for the production of several types of functional DCs. Common myeloid progenitors are normally a good source of DCs, but this potential was reduced by TLR9 ligation. Thus, alternate differentiation pathways may be used to produce innate effector cells in health and disease.

journal_name

Blood

journal_title

Blood

authors

Welner RS,Pelayo R,Nagai Y,Garrett KP,Wuest TR,Carr DJ,Borghesi LA,Farrar MA,Kincade PW

doi

10.1182/blood-2008-04-151506

subject

Has Abstract

pub_date

2008-11-01 00:00:00

pages

3753-61

issue

9

eissn

0006-4971

issn

1528-0020

pii

blood-2008-04-151506

journal_volume

112

pub_type

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