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The possible roles of airway branching patterns on the pathogenesis of lung diseases, especially on the heterogeneous distribution of the lesions, were examined through three-dimensional (3-D) morphometric analysis of a mouse lung injury, induced by bleomycin. On serial sections of a mouse lung damaged by subcutaneous injection of bleomycin, we performed a computer-assisted reconstruction of the lung for visualizing the relation of airways with the distribution of the lesions, and defined the features of bronchial routes to each lesion by four parameters: LTB; the distance from the hilum, Ng; generation numbers, RD(min); irregularity of airway branching, and thetaTB; the grade of airway recurrence. Among these four parameters, only thetaTB was found to correlate with the severity of lesions (p &lt; 0.05 by an ANOVA test), which was proved by a posthoc test (p &lt; 0.0001). These results showing the acini supplied by recurrent branches are more prone to be damaged than those by non-recurrent branches suggest that branching patterns may underlie the heterogeneous distribution of lesions in diffuse interstitial lung diseases.

tohoku journal of experimental medicine

Correlation between the Airway Branching Patterns and the Heterogeneous Distribution of the Lesions in Bleomycin-Injured Mouse Lung: A 3-D Morphometric Study.