Blockade of Dopamine D2 Receptors as a Novel Approach to Stimulation of [Notch1.sup.+] Endothelial Progenitor Cells and Angiogenesis in C57BL/6 Mice with Pulmonary Emphysema Induced by Proteases and Deficiency of [alpha]1-Antitrypsin

• Published in: Bulletin of experimental biology and medicine 2020-04, Vol.168 (6), p.718
• Main Authors: Skurikhin, E.G, Krupin, V.A, Pershina, O.V, Pan, E.S, Pakhomova, A.V, Sandrikina, L.A, Ermakova, N.N, Vaizova, O.E, Zhukova, M.A, Dygai, A.M
• Format: Article
• Language: English
• Subjects: Alpha 1-antitrypsin; Analysis; Cardiac glycosides; Cardiotonic agents; Emphysema, Pulmonary; Endothelium; Mice; Phenols; Proteases; Vascular endothelial growth factor
• ISSN: 0007-4888
• DOI: 10.1007/s10517-020-04787-9

We studied the effects of spiperone, a selective blocker of dopamine D2 receptors, on the model of pulmonary emphysema provoked by administration of elastase and D-galactosamine hydrochloride to female C57BL/6 mice and characterized by activation of proteases in the lungs and systemic deficiency of its inhibitor [alpha]1-antitrypsin. In this model, spiperone prevented the development of inflammatory reaction and reduced the area of emphysematous expanded alveolar tissue. The expression of angiogenic marker CD31 in the lungs increased under these conditions. Regeneration of the damaged microvascular bed under the action of spiperone resulted from recruiting of [Notch1.sup.+] endothelial progenitor cells ([CD45.sup.-][CD31.sup.+][CD34.sup.+]) into the lungs and blockade of the inhibitory effect of dopamine on phosphorylation of VEGF-2 receptors in endothelial cells of different maturity. In addition, spiperone produced a protective effect on hepatocytes and restored the production and secretion of [alpha]1-antitrypsin by these cells. Key Words: [alpha]1-antitrypsin; endothelial progenitor cells; spiperone; pulmonary emphysema; Notchl signaling