Abstract
Spleen cells from mice immunized with SRBC were subjected to controlled rate freezing to −100 °C. Complete recovery of PFC was obtained with DMSO used as the cryopreservative. Simple dilution of spleen cells in DMSO, or a single cycle of freezing and thawing in DMSO prior to short-term culture, resulted in early loss of recoverable cells. A single cycle of freezing and thawing inhibited the in vitro immune response to SRBC while having little effect on the response to TNP-T4. The in vitro blastogenic responses to LPS and PHA-P were severely reduced in cultures of frozen and thawed cells.
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