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In this study, Lactococcus lactis was engineered to express Giardia lamblia cyst wall protein 2 (CWP2) at three different subcellular locations, intracellular, secreted or cell-surface-anchored, using nisin as an inducing agent. CWP2 expression did not appear to be detrimental to L. lactis viability. No particular subcellular location of CWP2 expression offered any advantages over the others with respect to decreased toxicity towards the bacteria. All recombinant lactococci experienced a similar reduction in growth rate when induced. It was determined whether recombinant lactococcal cells engineered for cell surface expression of CWP2 were capable of inducing a CWP2-specific mucosal IgA antibody response. Recombinant lactococci were successful at inducing CWP2-specific IgA antibodies. Moreover, in a pilot challenge experiment, mice immunized with these recombinant lactococci demonstrated a significant (63 %) reduction in cyst output. Thus, it has been demonstrated that G. lamblia CWP2 may be expressed in L. lactis and that recombinant lactococcal cells elicit Giardia-specific antibodies which reduce cyst shedding in a murine model.

Expression of the Giardia lamblia cyst wall protein 2 in Lactococcus lactis