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Aldolase A is generally considered to be a muscle enzyme. Northern analysis of cultured cells suggests that it is present in both neurons and glia. Aldolase C shares 81% amino acid identity with aldolase A and 70% identity with aldolase B.
Images: Left: View of mixed neuron/glial cultures stained with Aldolase-C (green) and our rabbit antibody to NeuN/FOX3 (red). Aldolase-C antibody reveals strong cytoplasmic staining in astrocytes, while Rabbit Fox3/NeuN antibody shows nuclear and distal cytoplasmic staining in neuron cells and is complete absence of astrocytes. Blue is a DNA stain. Middle and Right: Mouse brain sections (fixed by transcardial perfusion with 4% paraformaldehyde) stained with Aldolase-C (red) and our chicken Vimentin antibody (green). In the striatum (Middle), Aldolase-C positive astrocytes are highly co-stained Vimentin, which results in yellow to gold colors. In the cerebellum (Right), however, Aldolase-C positive Purkinje cells do not express vimentin, which results in red color. Insets show a higher magnification picture of MO22135 single labeling in red. Nuclei are labeled with DAPI (blue).
Earlier studies using isozyme-specific antibodies report its location in gray matter astrocytes and cells of the pia mater. In situ hybridization of mouse central nervous system using isozyme-specific probes revealed that aldolase A and C are expressed in complementary cell types: aldolase A mRNA is found in neurons; aldolase C message is detected in astrocytes, some cells of the pia mater, and Purkinje cells. Aldolase C can in some situations be used as an astrocyte marker. However Purkinje cells of the cerebellum contain high levels of the enzyme, so the enzyme is not totally astrocyte specific.
Image: Blots of crude cow cerebellum homogenate blotted with Aldolase-C. The monoclonal antibody binds strongly and cleanly to a band at about 40 kDa. Other studies show that this antibody does not recognize the very closely related molecules aldolase A or B.