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International Journal of Experimental Pathology logoLink to International Journal of Experimental Pathology
. 1995 Aug;76(4):263–269.

Cell proliferation and apoptosis in isoprenaline-induced sialosis in the rat submandibular glands.

D M Chisholm 1, M M Adi 1
PMCID: PMC1997181  PMID: 7547440

Abstract

Regression of submandibular acinar cell hyperplasia after withdrawal of the mitogenic stimulus induced by isoprenaline was studied in male Wistar rats. Intraperitoneal administration of 39 mg of isoprenaline, in divided doses over a 9-day period, resulted in a marked increase in gland size and weight. The proportional volume occupied by acinar cells increased. These changes were associated with acinar cell proliferation and an increase in the mitotic index and cytoplasmic: nuclear ratio. Thus, both hyperplasia and hypertrophy clearly contributed to gland enlargement. Granular and other duct cells appeared to be unaffected by isoprenaline administration. Following cessation of the drug, the mitotic index reached a peak value by the second day but thereafter declined rapidly. This change was matched by a marked rise in the apoptotic cell index, the latter reaching a maximum by the fourth day. By the end of the second week, glands had returned to normal with respect to size and weight and neither hyperplasia nor apoptosis could be detected histologically. These results confirm that apoptosis is involved in the regulation of submandibular salivary gland size.

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