FIG. 8. Intracellular location of the CDR-1 protein in vivo. Transgenic C. elegans, which contain a
cdr-1/CDR-1-eGFP expression vector (JF13 (mtEx10,
cdr-1/CDR-1-GFP)), were fed RITC-dextran and then exposed to cadmium as described under 'Experimental Procedures.' Upper panels, JF13 (mtEx10,
cdr-1/CDR-1-GFP) C. elegans L2 larva. 'L' and 'Ph' indicate the location of the intestinal lumen and the nematode pharynx, respectively. Left panel, the location of CDR-1 visualized by fluorescent microscopy. Right panel, RITC-labeled lyso- somes visualized using a rhodamine filter set. Lower panel, composite, high magnification (1000x) view of an adult JF13 (mtEx10,
cdr-1/CDR- 1-GFP) C. elegans. The nematode is oriented with the gonad on the left and the intestine on the right. Fluorescence images obtained using eGFP and rhodamine filter sets were superimposed on the light microphotograph. Locations where the eGFP and rhodamine signals are coincident can be identified by the blue color. Black arrows indicate eGFP and rhodamine-containing lysosomes. White arrows indicate non-lysosomal gut granules.