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Immunologic requirements for the adoptive transfer of ectromelia virus meningitis
Abstract:
Intracerebral infection with the Hampstead egg strain of ectromelia virus in mice produced a meningitis with clinical signs and death. A single injection of cyclophosphamide three days after infection delayed the onset of pathology and clinical signs. Adoptive transfer of immune spleen cells into preinfected recipients could induce the meningitis earlier. These donor-immune cells were virus-specific in their action. The Ig- population, deficient in B lymphocytes, could transfer meningitis; but donor-immune cells depleted of T lymphocytes by anti-theta treatment or the Ig+ population, deficient in T-cells, were unsuccessful. Studies with labeled cells showed a preferential accumulation of labeled donor cells in cerebrospinal fluid in the first 24 hours post-transfer, whereas labeled recipient cells accumulated between 24 and 48 hours. The results demonstrated that the adoptive transfer of ectromelia virus meningitis was a cell-mediated inflammatory process.
Insights
Ectromelia virus infection in mice causes meningitis. Immune cell transfer studies reveal that T lymphocytes, not B lymphocytes, are crucial for this cell-mediated inflammatory process, influencing meningitis onset.
Area of Science:
- Virology
- Immunology
- Neuroscience
Background:
- Intracerebral ectromelia virus infection in mice leads to meningitis, characterized by clinical signs and mortality.
- Cyclophosphamide treatment can delay the onset of meningitis pathology and clinical manifestations.
Purpose of the Study:
- To investigate the immunological mechanisms underlying ectromelia virus-induced meningitis.
- To determine the role of specific immune cell populations in the pathogenesis of meningitis.
Main Methods:
- Induction of meningitis via intracerebral ectromelia virus infection in mice.
- Administration of cyclophosphamide to modulate immune response.
- Adoptive transfer of virus-specific immune spleen cells (T-cell and B-cell deficient populations) into infected recipients.
- Tracking of labeled donor and recipient cells in the cerebrospinal fluid.
Main Results:
- Adoptive transfer of immune spleen cells accelerated meningitis onset in a virus-specific manner.
- Meningitis transfer was successful with Ig- (B lymphocyte deficient) cells but not with anti-theta treated (T lymphocyte deficient) cells.
- Labeled donor cells preferentially accumulated in cerebrospinal fluid within 24 hours, while recipient cells accumulated later.
Conclusions:
- Ectromelia virus meningitis is primarily a cell-mediated inflammatory process.
- T lymphocytes play a critical role in the pathogenesis and adoptive transfer of ectromelia virus meningitis.
- Immune cell kinetics in the cerebrospinal fluid are crucial for understanding meningitis development.