Extinct type of human parvovirus B19 persists in tonsillar B cells #MMPMID28374737
Pyoria L; Toppinen M; Mantyla E; Hedman L; Aaltonen LM; Vihinen-Ranta M; Ilmarinen T; Soderlund-Venermo M; Hedman K; Perdomo MF
Nat Commun 2017[Apr]; 8 (?): 14930 PMID28374737show ga
Parvovirus B19 (B19V) DNA persists lifelong in human tissues, but the cell type harbouring it remains unclear. We here explore B19V DNA distribution in B, T and monocyte cell lineages of recently excised tonsillar tissues from 77 individuals with an age range of 2-69 years. We show that B19V DNA is most frequent and abundant among B cells, and within them we find a B19V genotype that vanished from circulation >40 years ago. Since re-infection or re-activation are unlikely with this virus type, this finding supports the maintenance of pathogen-specific humoral immune responses as a consequence of B-cell long-term survival rather than continuous replenishment of the memory pool. Moreover, we demonstrate the mechanism of B19V internalization to be antibody dependent in two B-cell lines as well as in ex vivo isolated tonsillar B cells. This study provides direct evidence for a cell type accountable for B19V DNA tissue persistence.
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Nat+Commun 2017 ; 8 (?): 14930
