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.
journal_name
Int J Exp Patholjournal_title
International journal of experimental pathologyauthors
Chisholm DM,Adi MMsubject
Has Abstractpub_date
1995-08-01 00:00:00pages
263-9issue
4eissn
0959-9673issn
1365-2613journal_volume
76pub_type
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journal_title:International journal of experimental pathology
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