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. 2020 Jan 22;58(1):116–123. doi: 10.1080/13880209.2019.1711135

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© 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 4. — Effect of sildenafil on proliferating cell nuclear antigen (PCNA) and caspase-3 expression of epithelial cells in bronchioles. Representative photomicrographs of PCNA and caspase-3 expression in bronchioles with immunohistochemical stain were shown in (A1, A2, and A3 as PCNA) and (B1, B2, and B3 as caspase-3) with scale bars = 40 μm. The data of PCNA IOD/area was shown in (C) and the data of caspase-3 IOD/area was shown in (D). Data were presented as mean ± SD; n = 10/group; *p < 0.05 vs. model group); **p < 0.01 vs. model group.