Sodium Valproate Facilitates the Propagation of Granulocytic Ehrlichiae (Anaplasma phagocytophilum) in HL-60 Cells |
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Authors: | Petr Zeman Jaroslav Cinatl Hana Kabickova |
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Institution: | (1) Regional Center of Hygiene, Dittrichova 17, 120 00 Prague 2, Czech Republic;(2) KlinLab s.r.o., Prague, Czech Republic |
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Abstract: | As already shown, some inducers of the differentiation of promyelocytic cells along the granulocytic pathway, such as dimethylsulphoxide
(DMSO) or all-trans retinoic acid, can enhance propagation of granulocytic ehrlichiae in HL-60 cell cultures. This study was conducted to prove
whether sodium valproate, a salt of di-n-propylacetic acid (VPA) known to trigger cellular differentiation in several solid and hematopoietic malignancies is similarly
efficient in ehrlichial cultures. Two cell lines derived from HL-60, that is, low-passage undifferentiated HL-60 (HL-60F)
and high-passage HL-60 spontaneously differentiated towards monocytic phenotype (HL-60J) were grown in RPMI 1640 medium supplemented
with 10% FBS. The respective HL-60F and HL-60J IC50-values for NaVPA were estimated to be 0.8 and 2.2 mM under these culture conditions; to stimulate the differentiation, the
respective doses of 0.3 and 1.2 mM were then applied. When the NaVPA-treated cells of both lines were challenged with an ehrlichial
laboratory strain (HGE), maintained in splenectomized NMRI mice, the respective 1–2 and ≤0.1% primary infection rates in HL-60F
and HL-60J cultures were observed 3 days post-inoculation. In comparison, only rare (≤0.1%) infected HL-60F and no infected
HL-60J cells were recorded under the same experimental conditions in untreated control cultures. HGE continuously propagated
in NaVPA-supplemented HL-60F cultures remained infectious to mice at least up to the 95th passage (12 months). NaVPA can thus
facilitated continuous propagation of granulocytic ehrlichiae in cell cultures without a substantial loss of infectiveness.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Anaplasma phagocytophilum ehrlichiosis cell culture HL-60 sodium valproate |
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