Interferon production by leukocytes infiltrating the lungs of mice during primary influenza virus infection

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Abstract
Lung fluids and leukocytes were obtained from uprimed C3H mice by transpleural lavage at intervals after infection with influenza A/Hong Kong/68 virus and were tested for interferon activity. Lavage fluid interferon titers correlated directly with lung virus titers and with initial increases in leukocyte yields from infected lungs. In contrast to cultured lymph node cells from infected animals or leukocytes from lungs of uninfected mice, washed leukocytes obtained from the lungs of mice infected 2 to 6 days earlier produced interferon spontaneously in culture. The physiochemical, biological and antigenic properties of both the interferon in lavage fluids and that produced by lung lavage leukocytes were similar and characteristic of .alpha.-interferon. Fractionation studies indicated that macrophages and T lymphocytes were primarily responsible for the interferon produced in culture. The early presence and significant numbers of interferon-producing leukocytes in infected lungs suggest that these cells have an early role in defence against influenza virus infection.