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. 1972 Dec 1;55(3):554–562. doi: 10.1083/jcb.55.3.554

CHANGES IN CHROMATIN TEMPLATE ACTIVITY AND THEIR RELATIONSHIP TO DNA SYNTHESIS IN MOUSE PAROTID GLANDS STIMULATED BY ISOPROTERENOL

Anna M Novi 1, Renato Baserga 1
PMCID: PMC2108820  PMID: 4571229

Abstract

Chromatin template activity of mouse parotid glands increases after a single injection of isoproterenol (IPR), a procedure that causes, after a lag period of 20 hr, a marked stimulation of DNA synthesis and cell division in salivary glands of rodents. The increase in chromatin template activity occurs as early as 1 hr and peaks between 6 and 10 hr after IPR, paralleling previously reported changes in the incorporation of uridine-3H into total cellular RNA of mouse parotids. Template activity was measured in vitro in a system in which parotid gland chromatin was incubated with an exogenous RNA polymerase isolated from Escherichia coli. Similar results were obtained when template activity of parotid gland chromatin was assayed using an homologous RNA polymerase from mouse liver. Chromatin template activity in mouse parotids was also studied after the administration of drugs capable of inducing in salivary glands both DNA synthesis and secretion or secretion alone. The results indicate that the increased chromatin template activity occurring 6 hr after IPR is related to the subsequent onset of DNA synthesis. Furthermore, the increased chromatin template activity caused by IPR is inhibited by the previous administration of puromycin, an inhibitor of IPR-stimulated DNA synthesis.

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Selected References

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