Abstract
Mitogenic responsiveness of peripheral blood lymphocytes (PBL) of chickens was suppressed by either pretreatment with or addition to the culture medium of various concentrations of carrageenan (CGN). Pretreatment for 1 hr significantly suppressed response to Concanavalin A (Con A) and Pokeweed mitogen (PWM) but did not affect Phytohemagglutinin (PHA) induced stimulation. Extension of the pretreatment period to 4 hrs suppressed response induced by all three mitogens. On the other hand, addition of carrageenan to the culture medium caused a dose-dependent suppression of PHA and Con A mediated response, but the effect on stimulation due to PWM was equivocal. In addition, low concentrations of CGN were weakly mitogenic to PBL and splenic lymphocytes.
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