Temperature modulation of the response of IG-positive cells to Goussia carpelli (Protozoa: Apicomplexa) infections in carp, Cyprinus carpio L
1997
Steinhagen, D.
The influence of temperature on the kinetics of immunoglobulin-positive (Ig+) leukocytes in cell suspensions prepared from the pronephros and the intestine of common carp Cyprinus carpio during the development of Goussia carpelli, a gut-dwelling coccidian parasite, was examined. The development of the parasite was temperature dependent. At 20 C, oocysts were formed 2-3 wk postexposure (PE), at 15 C for 31 wk PE, and at 12 C for 56 wk PE. At all 3 temperatures, changes of relative numbers of Ig+ cells were observed in cell suspensions. During merogony and gamogony, the proportion of Ig+ cells increased, peaked during oocyst formation of the parasite, and then remained elevated. Serum collected from infected carp 820 days PE contained immunoglobulins binding to G. carpelli merozoites. The development of the parasite and the increase of Ig+ cells in intestine and pronephros of infected carp were temperature dependent. The peak level of Ig+ cells appeared not to he influenced by temperature. These findings indicate that even at low temperatures local and systemic immune responses are induced in carp with enteritic parasite infection.
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