This paper describes the first localization study of the
14·7 kDa fatty acid-binding protein in Schistosoma japonicum
(Sj-FABPc) using transmission electron microscopy. A polyclonal antibody
raised against recombinant Sj-FABPc was used
in combination with a colloidal gold marker to determine the distribution
of the protein within adult parasites. Sj-FABPc
was localized within lipid droplets below the subtegumental region of the
male parasite. Additionally, Sj-FABPc was
present in the vitelline droplets of the vitelline glands of female
parasites. There were no detectable levels of Sj-FABPc
on the surface or within the tegument of male or female parasites.
Possible functions of Sj-FABPc within S. japonicum
and the relevance of these immunolocalization findings in light of the
recent reports that the homologue Sm-FABPc is
an important anti-S. mansoni vaccine target molecule are also
discussed.