DH82 cells: a macrophage cell line for the replication and study of equine infectious anemia virus.

The research paper discusses the successful use of a canine macrophage-like cell line, DH82, to study the replication and expression of the equine infectious anemia virus (EIAV). The DH82 cell line proved to be easily transfected, supports EIAV replication, and allows for effective laboratory investigations void of the challenges of blood monocyte isolation or problems associated with dominantly used equine macrophage cultures.

Introduction

• The equine infectious anemia virus (EIAV) largely replicates in tissue macrophages within a host. However, studying this replication in a laboratory setting has been problematic due to the difficulty involved in isolating blood monocytes.
• Additionally, the common use of equine macrophage cultures for these studies isn’t efficient as they have poor long-term viability and display resistance to transfection.

Use of DH82 Cells

• The researchers identified and used a canine macrophage-like cell line, DH82, which demonstrated an ability to support EIAV replication and was easily transfected.
• The DH82 cell line made it possible to study EIAV Tat transactivation of the LTR.
• Electrophoretic mobility shift assays were performed to identify transcription factor binding sites in the LTR enhancer region that were occupied by DH82 nuclear extracts.

Findings

• Five different motifs were identified. The ets motifs that are bound by PU.1 in primary macrophage nuclear extracts engaged with DH82 nuclear extracts.
• The PEA-2, Lvb and Oct motifs, typically found in fibroblast nuclear extracts, also bound with DH82 nuclear extracts, as did the methylation-dependent binding protein (MDBP) site.
• The results imply that DH82 cell line could be utilized to study both macrophage-adapted and fibroblast-adapted EIAV.

Conclusion

• Infectivity studies affirmed that both strains of EIAV, those that replicate exclusively in macrophages and those adapted to fibroblasts, can replicate within the DH82 cells.
• DH82 cells could be efficiently transfected with the EIAV molecular clone, and virus spread was identified within the culture.
• The research concluded that the DH82 cell line could serve as an effective tool for studying EIAV replication and expression, overcoming the challenges of traditional laboratory methods.