Chronic sialadenitis. An immunocytochemical study in humans

Area of Science:

• Pathology
• Immunocytochemistry
• Salivary Gland Biology

Background:

• Chronic inflammation significantly alters salivary gland parenchyma.
• Understanding cellular changes is crucial for diagnosing and managing salivary gland disorders.

Purpose of the Study:

• To investigate the immunocytochemical changes in salivary gland parenchyma during chronic inflammation.
• To identify specific cell populations affected by chronic inflammation and assess their potential role in tissue repair.

Main Methods:

• Immunocytochemical analysis using antibodies against myosin, prekeratin, keratin CAM 5.2, keratin 7, and keratin 16a.
• Examination of cellular morphology and distribution in inflamed salivary gland tissues.
• Comparison of observed changes with those following experimental duct ligation.

Main Results:

• Myoepithelial cells surrounding persisting acini and ductal structures survived chronic inflammation.
• Ductal structures were identified as either surviving intercalated ducts or altered acinar cells.
• A significant reduction or absence of basal duct cells positive for keratin 16a was observed, except in mild inflammation cases.

Conclusions:

• Chronic inflammation leads to distinct cellular alterations in salivary glands, including myoepithelial cell survival and loss of keratin 16a-positive basal duct cells.
• The absence of these basal duct cells, potentially reserve cells, may impair the recovery of salivary gland parenchyma post-inflammation.
• Findings suggest a link between specific cell populations and the regenerative capacity of salivary glands following inflammatory insult.