Abstract
Mesenchymal stromal/stem cell (MSC) therapy with the goal of restoring salivary function following irradiation injury or in Sjögren’s syndrome (SS) has made significant advances within the past 5 years. The majority of studies used MSCs obtained from the bone marrow or adipose tissue, but MSCs isolated from the salivary gland, dental pulp, and umbilical cord also demonstrated a therapeutic efficacy in reestablishing salivary function. Based on the amount of stimulated saliva secretion as a functional quantitative measure, irradiated mice/rats that received MSC therapy restored their salivary flow rate (SFR) to 60–90 % of normal age-matched animals, while SFR of irradiated animals without treatment remained at 35–50 % of secretory function. Thus, there was 25–40 % therapeutic improvement in animals receiving MSC therapy versus those that did not. This would be clinically significant because patients with severe salivary hypofunction (dry mouth) due to head and neck irradiation have no improvement in SFR, if left untreated. In the SS-like disease mouse model, MSC therapy restored SFR 80–100 % when treatment was given at an initial phase of SS-like disease, while its effectiveness decreased to 50–60 % when given at an advanced stage of disease. In SS patients, MSC therapy improved SFR by 40–50 %. When tested in the rodent model, MSC therapy was successful in restoring/maintaining the gland normal weights and histology (acinar cells, blood vessels) and upregulated the expression of genes favorable for salivary gland development and regeneration while downregulating inflammation and cell apoptosis, promising positive effects of MSC therapy.
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Acknowledgments
We thank Professor Bruce J Baum for his invaluable advice, input, and encouragements during these past several years on the research pertaining to bone marrow cells and its cell soup in the repair of salivary glands. These studies were supported in part by the Canadian Institutes of Health Research (CIHR).
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Tran, S.D., Sumita, Y., Fang, D., Hu, S. (2017). Adult Stem Cell Therapy for Salivary Glands, with a Special Emphasis on Mesenchymal Stem Cells. In: Cha, S. (eds) Salivary Gland Development and Regeneration. Springer, Cham. https://doi.org/10.1007/978-3-319-43513-8_5
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