title: Effect of interferon on thoracic duct lymphocyte output: induction with either poly I:poly C or vaccinia virus.
abstract: Systemic inoculation of the interferon (IFN) inducer polyinosinic-polycytidylic polyribonucleotide (poly I:poly C) into CBA/J mice produces a significant decrease in the number of thoracic duct lymphocytes (TDL) collected 6 to 22 hr after injection. The number of TDL is restored to normal levels by 48 to 64 hr. Residual TDL collected during the inhibition period of poly I:poly C treatment showed a phenotypic profile similar to phosphate-buffered saline- (PBS) treated control groups when examined for Lyt-1.1, Lyt-2, Thy-1.2 and Iak surface markers. Interferon is implicated as the mediator of this phenomenon since: 1) Inoculation of exogenous IFN can induce a similar suppression in the number of recoverable TDL. 2) Pretreatment of mice with sheep anti-murine IFN serum can block this effect of poly I:poly C. Similar experiments with vaccinia virus demonstrate that although live virus can partially suppress the TDL output, almost complete suppression is achieved with ultraviolet (UV)-inactivated virus. Vaccinia virus-induced suppression of the number of TDL also appears to be caused by IFN since: 1) UV-inactivated virus induces significantly higher serum levels of IFN in comparison to live virus. 2) The suppression of TDL output by either live or UV-inactivated vaccinia virus can be blocked by pretreatment with anti-murine IFN. These findings suggest that the immunosuppression often associated with viral infections may be at least partially due to a decrease in lymphocyte recirculation mediated by the IFN initially released in response to the virus.
mesh_terms: D000818:Animals; D001667:Binding, Competitive; D002452:Cell Count; D007106:Immune Sera / Q000494:pharmacology; D007369:Interferon Inducers / Q000494:pharmacology*; D007372:Interferons / Q000096:biosynthesis / Q000276:immunology / Q000502:physiology*; D007700:Kinetics; D008213:Lymphocyte Activation / Q000187:drug effects; D008214:Lymphocytes / Q000145:classification / Q000276:immunology*; D008297:Male; D051379:Mice; D008808:Mice, Inbred CBA; D011070:Poly I-C / Q000008:administration & dosage / Q000494:pharmacology; D013897:Thoracic Duct / Q000166:cytology / Q000276:immunology*; D014616:Vaccinia virus / Q000276:immunology
chemical_list: D007106:Immune Sera; D007369:Interferon Inducers; D007372:Interferons; D011070:Poly I-C