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Since there is a good deal of evidence that vicia villosa lectin (VVA) binds to contrasuppressor cells, mouse splenocytes and thymocytes were sorted by binding to VVA-coated Petri dishes. It was observed that vicia villosa adherent cells (VVA(+)) did not proliferate when mitogens were added to cultures, but they did enhance the thymidine uptake of PHA or ConA stimulated vicia villosa non-adherent (VVA(-)) splenocytes. PGE2 treatment of VVA(+) splenocytes or VVA(+) immature thymocytes did not very much affect the VVA(+) cell behavior. On the other hand, LTB4 increased the enhancing capability of VVA(+) splenocytes. Therefore, investigations dealing with the effects of LTB4 on lymphocyte subsets which may include VVA(+) cells should take into consideration the possible presence of contrasuppressor cells.
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