Characterization of lymphangiogenesis in various stages of idiopathic diffuse alveolar damage

Masahiro Yamashita, Noriyuki Iwama, Fumiko Date, Ryoji Chiba, Masahito Ebina, Hiroshi Miki, Kohei Yamauchi, Takashi Sawai, Masato Nose, Shinobu Sato, Tohru Takahashi, Masao Ono

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

In pulmonary fibrosis, an abnormal healing process, is believed to be involved in the damage to lung tissue. This process has not been correlated with lymphangiogenesis, which has garnered current interest in relation to wound healing. The aim of the present study was to clarify the characteristics of lymphangiogenesis in pulmonary fibrosis associated with idiopathic diffuse alveolar damage. Formalin-fixed and paraffin-embedded lung tissues from 13 autopsy cases with idiopathic diffuse alveolar damage were used. Antibodies specific to CD34 and D2-40 were used to detect blood vessels and lymphatics, respectively, and immunohistochemical examinations and morphometry analyses were performed. The standardized density of capillaries was increased significantly in the exudative stage of diffuse alveolar damage, whereas that of the lymphatics remained unchanged. In the proliferative stage, new lymphatics emerged, primarily in the intra-alveolar fibrotic lesions where capillaries were absent. In the fibrotic stage, in which the lung was shrunken, as revealed by the elevated density of pulmonary arteries, the standardized density of capillaries was reduced significantly. The standardized area density of the interstitium was elevated in the proliferative stage and subsequently reduced in the fibrotic stage. Three-dimensional reconstruction of images revealed that some new lymphatics lacked connection to existing lymphatics. During the progression of diffuse alveolar damage, lymphangiogenesis occurs independent of capillary angiogenesis.

Original languageEnglish
Pages (from-to)542-551
Number of pages10
JournalHuman Pathology
Volume40
Issue number4
DOIs
Publication statusPublished - 2009 Apr

Keywords

  • Capillary angiogenesis
  • Diffuse alveolar damage
  • Lymphangiogenesis
  • Pulmonary fibrosis

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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