Development and characterization of SV40 immortalized rat parotid acinar cell lines

In Vitro Cellular & Developmental Biology. Animal
D O QuissellJ T Turner

Abstract

Rat parotid salivary gland acinar cells were transfected by CaPO4 precipitation using a plasmid containing a replication-defective simian virus (SV40) genome. Out of 30 clonal cell lines, 2 were shown to have moderate to high levels of cytodifferentiation and salivary gland acinar cell function. Functional studies with the two cell lines indicated that the beta-adrenergic agonist (isoproterenol), vasoactive intestinal peptide prostaglandin E1, and forskolin were effective activators of intracellular cyclic adenosine 3':5'-cyclic monophosphate production. Phenylephrine, carbamylcholine, and UTP were effective in increasing inositol phosphate production and intracellular free calcium levels, whereas substance P was without affect. Utilizing indirect immunofluorescence analysis, both cell lines were shown to express the SV40 large T antigen. Electron microscopic evaluation documented moderate to high levels of cytodifferentiation with the maintenance of tripartite junctional complexes, cellular polarization, and presence of moderate amounts of secretory granules and rough endoplasmic reticulum. The two cell lines had doubling times of 22 and 36 h, respectively.

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