In vivo dynamics and adaptation of HTLV-1-infected clones under different clinical conditions.

Autor: Mikiko Izaki, Jun-Ichirou Yasunaga, Kisato Nosaka, Kenji Sugata, Hayato Utsunomiya, Youko Suehiro, Takafumi Shichijo, Asami Yamada, Yasuhiko Sugawara, Taizo Hibi, Yukihiro Inomata, Hirofumi Akari, Anat Melamed, Charles Bangham, Masao Matsuoka
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: PLoS Pathogens, Vol 17, Iss 2, p e1009271 (2021)
Druh dokumentu: article
ISSN: 1553-7366
1553-7374
DOI: 10.1371/journal.ppat.1009271
Popis: Human T-cell leukemia virus type 1 (HTLV-1) spreads through cell contact. Therefore, this virus persists and propagates within the host by two routes: clonal proliferation of infected cells and de novo infection. The proliferation is influenced by the host immune responses and expression of viral genes. However, the detailed mechanisms that control clonal expansion of infected cells remain to be elucidated. In this study, we show that newly infected clones were strongly suppressed, and then stable clones were selected, in a patient who was infected by live liver transplantation from a seropositive donor. Conversely, most HTLV-1+ clones persisted in patients who received hematopoietic stem cell transplantation from seropositive donors. To clarify the role of cell-mediated immunity in this clonal selection, we suppressed CD8+ or CD16+ cells in simian T-cell leukemia virus type 1 (STLV-1)-infected Japanese macaques. Decreasing CD8+ T cells had marginal effects on proviral load (PVL). However, the clonality of infected cells changed after depletion of CD8+ T cells. Consistent with this, PVL at 24 hours in vitro culture increased, suggesting that infected cells with higher proliferative ability increased. Analyses of provirus in a patient who received Tax-peptide pulsed dendritic cells indicate that enhanced anti-Tax immunity did not result in a decreased PVL although it inhibited recurrence of ATL. We postulate that in vivo selection, due to the immune response, cytopathic effects of HTLV-1 and intrinsic attributes of infected cells, results in the emergence of clones of HTLV-1-infected T cells that proliferate with minimized HTLV-1 antigen expression.
Databáze: Directory of Open Access Journals
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