Abstract:
:Murine acquired immunodeficiency syndrome (MAIDS) induced by a defective LP-BM5 murine leukemia virus (MuLV) produces hematopoietic cytopenias similar to HIV in patients with AIDS. The pathogenesis of MAIDS induced cytopenias remains obscure; however, direct retroviral infection of bone marrow stroma has been implicated to play a role. To evaluate the consequential effect of viral infection, primary stromal cell cultures were transiently incubated in vitro with LP-BM5 MuLV viral supernatant. Reverse transcription polymerase chain reaction (RT-PCR) and Southern blot hybridization revealed that defective LP-BM5 MuLV infection resulted in elevated levels of IL-4 and TGFbeta1 transcript expression in infected stromal cells. The increased expression of both IL-4 and TGFbeta1 transcripts was associated with enhanced production of corresponding proteins as determined by quantitative western blot analyses. Hematopoietic reconstitution assays revealed that the hematopoietic support function of stromal cells was significantly reduced following transient exposure to LP-BM5 MuLV. The production of nonadherent mononuclear cells and the growth of myeloid, megakaryocyte and erythroid lineages were all suppressed in infected cultures. Culture supernatant conditioned by infected stromal cells demonstrated growth-inhibitory activity for hematopoietic progenitor colony formation. This growth-inhibitory activity could be significantly abolished by addition of anti-IL-4 and/or anti-TGFbeta1 neutralizing antibodies to the culture supernatant or directly to the stromal cell cultures. This study demonstrates LP-BM5 MuLV increases two known cytokines to suppress hematopoiesis implicating viral infection can directly suppress hematopoiesis mediated by inhibitors released from marrow stroma.
journal_name
Virus Resjournal_title
Virus researchauthors
Tse KF,Inayat MS,Morrow JK,Hughes NK,Oakley OR,Gallicchio VSdoi
10.1016/j.virusres.2005.03.027subject
Has Abstractpub_date
2005-10-01 00:00:00pages
1-15issue
1eissn
0168-1702issn
1872-7492pii
S0168-1702(05)00095-Xjournal_volume
113pub_type
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