title: Differential localization of "brain-specific" S-100 and its subunits in rat salivary glands.
abstract: In the rat, the S-100 antigens in the submandibular gland were found to be immunochemically identical with those in the brain (glial cells) when compared using crossed immunoelectrophoresis. Specific antibodies against the S-100a non-beta and against the S-100 beta subunit were prepared from antibodies against crude S-100 protein and from S-100 components (S-100a and b) by affinity chromatography. In the rat salivary glands a differential distribution of subunit immunoreactivity was clearly evidenced using indirect immunofluorescence. Certain intercalated duct cells of the submandibular gland as well as Schwann cells contained the S-100 beta subunit immunoreactivity exclusively, while other duct cells in parotid, submandibular, and sublingual glands contained S-100a non-beta subunit immunoreactivity. Both subunits were present in astrocytes and ependymal cells. The immunocytochemical localization of alpha and beta subunits is a promising technique for the classification of various types of S-100-containing cells.
mesh_terms: D000818:Animals; D015415:Biomarkers; D001923:Brain Chemistry; D008297:Male; D009414:Nerve Growth Factors; D051381:Rats; D011919:Rats, Inbred Strains; D064568:S100 Calcium Binding Protein beta Subunit; D009418:S100 Proteins / Q000032:analysis*; D012471:Salivary Proteins and Peptides / Q000032:analysis*
chemical_list: D015415:Biomarkers; D009414:Nerve Growth Factors; C030564:S-100 calcium-binding protein alpha subunit; D064568:S100 Calcium Binding Protein beta Subunit; D009418:S100 Proteins; D012471:Salivary Proteins and Peptides