Kinetics of inflammation and sarcoma cell development in primary Moloney sarcoma-virus-induced tumors

Differential kinetics of antigen-specific CD4+ and CD8+ T cell responses in the regression of retrovirus-induced sarcomas

Despite the accepted role for CD4+ T cells in immune control, little is known about the development of Ag-specific CD4+ T cell immunity upon primary infection. Here we use MHC class II tetramer technology to directly visualize the Ag-specific CD4+ T cell response upon infection of mice with Moloney murine sarcoma and leukemia virus complex (MoMSV). Significant numbers of Ag-specific CD4+ T cells are detected both in lymphoid organs and in retrovirus-induced lesions early during infection, and they express the 1B11-reactive activation-induced isoform of CD43 that was recently shown to define effector CD8+ T cell populations. Comparison of the kinetics of the MoMSV-specific CD4+ and CD8+ T cell responses reveals a pronounced shift toward CD8+ T cell immunity at the site of MoMSV infection during progression of the immune response. Consistent with an important early role of Ag-specific CD4+ T cell immunity during MoMSV infection, CD4+ T cells contribute to the generation of virus-specific CD8+ T cell immunity within the lymphoid organs and are required to promote an inflammatory environment within the virus-infected tissue.

Indomethacin influences Moloney's sarcoma and associated periosteal osteogenesis in the mouse

The effect of indomethacin on periosteal osteogenesis mediated by the Moloney sarcoma virus was studied using a mouse model. In the indomethacin-treated animals, the development of sarcoma was inhibited, as evaluated by the tumor incidence, tumor size, and maximal tumor duration. Periosteal osteogenesis mediated by this sarcoma was lower than in saline-treated control mice.