Abstract
Lymph node morphology, in vitro lymphocyte transformation, and inhibition of macrophage migration were studied at varying intervals after sensitization for Jones-Mote hypersensitivity (JMH) with ovalbumin (OA) in Freund's incomplete adjuvant (FIA). The effect of cyclophosphamide (CY, 300 mg/kg), given 3 days before sensitization with OA in FIA, was also studied in an attempt to clarify further its role in increasing the intensity of skin reactions and its effect on the passive transfer of skin reactivity described in the preceding paper. There were increased numbers of large pyroninophilic cells in paracortical areas of draining lymph nodes and increased in vitro DNA synthesis, by lymph node cells, in animals treated with CY 3 days before sensitization with OA in FIA. There was no inhibition of macrophage migration of PEC from animals sensitized with OA in FIA, whether or not these guinea pigs had been treated with CY before sensitization.
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