Feline parvovirus propagates in cat bone marrow cultures and inhibits
hematopoietic colony formation in vitro
GJ Kurtzman, L Platanias, L Lustig, N Frickhofen and NS Young
Cell Biology Section National Heart, Lung, and Blood Institute, Bethesda,
MD.
Feline parvovirus (FPV) causes leukopenia in naturally infected cats. We
investigated the mechanism of hematopoietic depression by this virus in
feline bone marrow cultured in vitro. In suspension cultures we
demonstrated FPV propagation and replication using DNA molecular
hybridization. Viral RNA and DNA were observed by in situ hybridization in
about 10% of marrow cells at day 3. Granulocytes and their precursors were
virtually absent from infected cultures after six days. Infected cells
showed viral capsid protein predominantly in nuclei by immunofluorescence.
In clonal assays, FPV most efficiently inhibited hematopoietic colony
formation by myeloid progenitor cells (CFU-GM), but erythroid colony
formation (BFU-E and CFU-E-derived) was also depressed in the presence of
virus. Inhibition of colony formation could be abrogated by physical
inactivation of the virus or preincubation with specific neutralizing
antibodies. Recombinant human colony stimulating factors GM-CSF and G-CSF
supported feline myelopoiesis in progenitor assays, and FPV completely
inhibited factor dependent colony formation.
Volume 74,
Issue 1,
pp. 71-81,
07/01/1989
Copyright © 1989 by The American Society of Hematology